EP2086387A1 - Diaphragm entry for posterior surgical access - Google Patents
Diaphragm entry for posterior surgical accessInfo
- Publication number
- EP2086387A1 EP2086387A1 EP06839809A EP06839809A EP2086387A1 EP 2086387 A1 EP2086387 A1 EP 2086387A1 EP 06839809 A EP06839809 A EP 06839809A EP 06839809 A EP06839809 A EP 06839809A EP 2086387 A1 EP2086387 A1 EP 2086387A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- access device
- elongate member
- balloon
- rail
- heart
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
- A61B17/3417—Details of tips or shafts, e.g. grooves, expandable, bendable; Multiple coaxial sliding cannulas, e.g. for dilating
- A61B17/3421—Cannulas
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
- A61B2017/348—Means for supporting the trocar against the body or retaining the trocar inside the body
- A61B2017/3482—Means for supporting the trocar against the body or retaining the trocar inside the body inside
- A61B2017/3484—Anchoring means, e.g. spreading-out umbrella-like structure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/34—Trocars; Puncturing needles
- A61B2017/348—Means for supporting the trocar against the body or retaining the trocar inside the body
- A61B2017/3482—Means for supporting the trocar against the body or retaining the trocar inside the body inside
- A61B2017/3484—Anchoring means, e.g. spreading-out umbrella-like structure
- A61B2017/3486—Balloon
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00053—Mechanical features of the instrument of device
- A61B2018/00273—Anchoring means for temporary attachment of a device to tissue
- A61B2018/00291—Anchoring means for temporary attachment of a device to tissue using suction
Definitions
- Embodiments of the invention relate to methods for minimally invasive surgery and devices useful in such methods. More particularly, methods and devices described herein permit improved access within- a body cavity to perform a surgical procedure, for example ablation and/or coagulation of cardiac tissue during ininimally invasive surgical access to the heart.
- the diaphragmatic access described provides direct visualization of anatomic structures within the thoracic cavity such as the posterior left atrium, the posterior side of pulmonary veins, or any other such anatomic structure.
- accessing the thoracic cavity in this manner facilitates manipulation of a coagulation probe to reliably create transmural, curvilinear lesions capable of preventing the propagation of wavelets that initiate and sustain atrial fibrillation, atrial flutter, ventricular tachycardia, or other arrhythmia substrate.
- a median sternotomy provides the most exposure for the physician.
- the surgeon creates a midline incision through the sternum that cuts along the bone separating it into two sections.
- the posterior surface of the heart or other organs is still not readily visible unless the heart is significantly rotated or lifted.
- significant rotation or lifting of the heart may cause undesirable hemodynamic issues during beating heart procedures.
- the surgeon closes the median sternotomy with large diameter metal wires. The rejoined tissue must be held stable during the healing process, similar to a bone fracture that must remain immobile during rehabilitation. Any coughing or dramatic movement is extremely painful to the patient because the chest moves.
- rehabilitation after the medial sternotomy requires a significant amount of time.
- Thoracotomy techniques involve creating large (or small with, minithoracotorny) incisions between the ribs to gain access to the thoracic cavity. After the incision, the surgeon separates the ribs with a rib spreader to produce space for insertion of various instruments. The muscles that overlay the chest must be cut during the thoracotomy. Much of the pain during the rehabilitation process is due to the cutting of the muscles.
- a thoracotomy provides limited access and visualization to the heart unless endoscopes are used. Yet, even the use of endoscopes provides limited access to the posterior regions of the heart and lungs because these organs cannot be lifted or rotated easily.
- Thoracostomy techniques use ports through the space created during the thoracotomy.
- the surgeon uses trocars (e.g. 6-10 mm) to access the thoracic cavity.
- Access to the anterior surface of the heart is generally sufficient with this technique.
- this technique does not provide ready access or visualization of posterior regions of the heart or other organs.
- IQ s ⁇ bxyphoid techniques the surgeon creates an incision below the xyphoid process but above the diaphragm. This technique is common for pericardiocentesis where blood is removed from the pericardial cavity during a pericardial effusion or tamponade. The diaphragm provides a barrier and hindrance to manipulating the heart or accessing the posterior heart surface during subxyphoid techniques. Accordingly, subxyphoid techniques are often limited to procedures that target the anterior or apical ventricular regions. [0007] The conventional surgical techniques discussed do not provide the medical practitioner with sufficient visibility of anatomic structures within the thoracic cavity.
- Atrial fibrillation surgery is just one example of a surgical procedure that, while it relies on the surgical techniques discussed above, the procedure also suffers from, shortcomings due to a lack of access to organs within the thoracic cavity.
- Atrial fibrillation surgery involving radiofrequency, DC 5 microwave, ultrasound, laser or other modes of thermal ablation of atrial tissue has a limitation where tissue contact throughout the length of the electrode(s) is/are not consistent
- Such inconsistent electrode contact causes variability in the transmission of energy throughout the target length of ablated/coagulated tissue.
- This inconsistency also produces undesirable gaps of viable tissue that promote propagation of wavelets that sustain atrial fibrillation, or produce atrial flutter, atrial tachycardia, or other arrhythmia substrate.
- Target tissue regions that reside along the posterior surface of the heart is one factor that contributes to inconsistent electrode contact.
- conventional means of surgical access are not optimal to access the posterior surfaces.
- Atrial fibrillation ablation may involve extending a lesion to the annulus near where the circumflex, right coronary artery and coronary sinus reside.
- atrial fibrillation involves ablating ventricular tachycardia substrates residing near the coronary arteries or coronary veins.
- the esophagus resides along the posterior left atrium between the left and right pulmonary veins; unanticipated heating of the esophagus during atrial fibrillation, treatment can produce esophageal fistulas which can be associated with high morbidity and mortality rates.
- Conventional approaches cannot selectively ablate the desired soft tissue structures while isolating other tissue structures that are intended to be preserved from targeted regions.
- the improved methods and devices described herein offer improved access to tissue regions within the body, especially those organs in the thoracic cavity. Variations of these methods and devices address the above described deficiencies for atrial fibrillation and ventricular tachycardia ablation.
- the embodiments or variations of the embodiments may address similar deficiencies, which are apparent during other applications involving coagulation of a selected tissue region in a precise manner.
- the devices described herein allow for creating a temporary cavity between organs in a body.
- the devices include an elongate member having at least one working channel extending therethrough, the elongate member having a distal portion adapted for insertion into the body and a proximal portion, the elongate member having sufficient column strength to allow insertion of the distal portion between organs, at least one opening at a distal end of the elongate member, where the working channel(s) exits the elongate member at the o ⁇ ening(s), and a first expandable member adjacent to the distal portion adapted to expand about the elongate member, where upon expansion between organs the first expandable member separates the organs to form the temporary cavity around the opening(s).
- an access device may have an additional working channel (referred to as a working lumen) that is intended to allow insertion and removal of various devices in the main working channel without disturbing a device (e.g., a scope) that is left at the surgical site in the working lumen (i.e., separate).
- a working lumen an additional working channel that is intended to allow insertion and removal of various devices in the main working channel without disturbing a device (e.g., a scope) that is left at the surgical site in the working lumen (i.e., separate).
- Variations of the access device include expandable members that are configured to expand non-uniformly about the elongate member. As discussed below, this configuration may permit improved formation of a temporary cavity.
- the elongate body may be tapered increasingly from a distal portion to the proximal portion. This tapering provides several advantages such as: causing natural separation of organs as the elongate member is further advanced between organs, facilitating easier manipulation of multiple instruments through, the elongate member (given the larger size of the proximal working channel), and increases the maneuverability of instruments within the elongate member.
- the devices may also include a proximal portion of the elongate member that allows manipulation of the access device outside of the body.
- the proximal portion may have one or more handles or grips that are commonly known and used in medical devices.
- the access devices described herein may be constructed to have lengths that are slightly greater than the lengths of standard scopes. In this manner, a scope advanced through the device will be placed at the temporary cavity, reducing the risk that the scope may be advanced through the temporary cavity and cause unintended damage.
- Variations of tihe device further include one or more shapeable support members coupled to the elongate member, where the shapeable support member causes the elongated member to retain a shape of the shapeable support member.
- the shapeable support member may be placed in a support lumen.
- a shapeable support may be formed or shaped outside of the device by the medical practitioner. Upon achieving the desired shape, the support member is advanced within the support lumen causing the device to conform to the desired shape.
- the expandable members described herein include balloons, or strand-like support members. Any number of expandable members may be used on a device. In some variations, the expandable support member (or a portion thereof) extends beyond the distal end of the elongate member. This feature permits clearance between the end of the device and body tissue or fluids.
- the balloons or support members described herein may be of any shape as described below.
- the expandable members may include features (e.g., grooves, coatings, etc.) that assist in separating, elevating and/or stabilizing tissue or organs.
- the expandable members may be expanded independently of each other or maybe constructed to expand together.
- the devices described herein may include any number of suction ports at the end or within the working channel of a device. Furthermore, the device may include visualization elements to aid in observing the surgical platform in the temporary cavity. [0022] The devices described herein may also include locking features that assist in securing the device within the body. For example, the device may include a set of locking balloons located proximally on the elongate member where the balloons secure the device within the body or to an outside surface of the body just adjacent to the incision.. [0023] Variations of access devices also include expandable members that are slidable into and out of the elongate member. These expandable members may have any number of sets of arms that separate and elevate organs to create the temporary cavity.
- the methods permit accessing a body organ in a patient via a minimally invasive procedure, by advancing an access device through an opening in the patient, where the access device comprises at least at least one working channel and an expandable member on an exterior of the device, forming a temporary cavity by actuating the expandable member to separate adjacent tissue structures, positioning a rail-member in the temporary cavity, where the rail-member includes a far section that is affixed relative to the access device, and moving a near section of the rail-member distally relative to the access device such that a mid section of the rail- member forms an arcuate profile distal to the access device and over or adjacent to the body organ.
- the methods may include advancing the access device through a diaphragm.
- the device is advanced through a first incision in an abdomen of the patient creating an opening in the diaphragm, and advancing the access device through the diaphragm into the thoracic cavity.
- Themethods include use of a visualization system coupled to the working channel or inserting a scope-type device into the working channel to provide visual access to the posterior surface of the organ.
- the methods described herein include creating a temporary cavity on surfaces of the heart where the access device is placed in the thoracic cavity between the heart and spine.
- the temporary cavity may be formed on other organs such as an esophagus, and actuating the expandable member to separate the esophagus from esophageal vessels.
- Methods are also described to treat a body organ in a thoracic cavity of a patient via a minimally invasive procedure by accessing a diaphragm through a first incision in an abdomen of the patient, placing a device having at least one ultrasound transducer coupled thereto against a surface of the diaphragm, and applying ultrasound energy through the diaphragm to tissue within the thoracic cavity.
- Another variation of the invention includes a system for treating tissue in the body, the system comprising, an access device having an elongate member having a working channel extending therethrough, the elongate member having a distal portion adapted for insertion into the body and a proximal portion, the elongate member having a column strength to allow insertion of the distal portion between organs, an opening at a distal end of the elongate member, where the working channel exits the elongate member at the opening, a rail-member having a far section, a near section, and a mid section located therebetween, where the far section is affixed relative to the elongate member, the near section being moveable relative to the elongate member, such that distal movement of the near section causes the mid-section of the rail-member to assume an arcuate profile distally to the opening, a first expandable member located at the distal portion and adapted to expand about the elongate member, where upon expansion between organs the first expand
- FIGS. IA and IB show top views of patients with two Diaphragm Access process embodiments of accessing the thoracic cavity to manipulate coagulation, dissection, and visualization devices;
- FIGS.1C and ID show a partial side view of the thoracic cavity and demonstrates an example of insertion of an access device into the abdominal space and ultimately into the thoracic cavity;
- FIGS. 2A to 2C show side sectional views of a thoracic cavity with a variation of an access device used to separate the heart from posterior anatomy;
- FIGS. 3 A to 3 C show side views of a thorax with a device as described herein defining a temporary cavity through which surgical devices may be manipulated during a surgical procedure;
- FIGS. 3D to 3F show side views of a thorax to illustrate accessing a posterior atrial surface around pulmonary veins without having to dissect tissue around the pulmonary veins;
- FIG. 4A shows a variation of an access device placing an ultrasound device against a diaphragm
- FIG. 4B shows an example of an access device separating the esophagus from associated vessels
- FIGS. 5A to 5C show side views of a patient with three processes of accessing the thoracic cavity to manipulate coagulation, dissection, and visualization devices;
- FIG. 5D shows a top view of a patient positioned on the operating table during a
- FIGS. 6A to 6D show a perspective view of the posterior heart with lesions created via a Diaphragm Entry for Posterior Access process embodiment of the invention
- FIGS. 7A to 7C show a top view, a side-sectional view, and a cross-sectional view of an variation of an access device for use as described herein;
- FIGS. 7D to 7E show another variation of an access device having a tapered elongate member
- FIGS. 7F to 71 show variations of an access device having a working channel and a second working lumen
- FIG. 7 J show a variation of an access device where the working channel and second working lumen are offset at the proximal end of the device;
- FIGS. 8A to 8C show a top view, a side view, and a bottom view of another variation of an access device
- FIGS. 9A to 9D show front and side-sectional views of an access device using stabilizer members and stabilizer members within a balloon;
- FIGS. 1OA to 1 OC show a top view, a side view, and a bottom view of an access device having multiple stabilizer strands as expanding and stabilizing members;
- FIGS. 1 IA and 1 IB show a top view and a front view of an access device when the stabilizer members are in a compressed, low profile configuration
- FIGS. HC and 1 ID show a side view and a front view of the access device of
- FIGS. 1 IA and HB in an expanded configuration
- FIGS. 12A to 12C show a side view, an end view, and an isometric view of an access device having multiple balloons
- FIGS. 12D to 12 J show additional variations of access devices;
- FIGS. 13A to 13C show perspective views of a dissecting instrument embodiment manipulated during the Diaphragm Entry for Posterior Access process of the invention to further define a cavity into which instruments may be manipulated;
- FIG. 14A shows a side view of a dissecting instrument embodiment in a non- actuated configuration;
- FIG. 14B shows a side view of the dissecting instrument in FIG. 14A in an actuated configuration
- FIGS. 14C and 14D show cross-sectional views taken along section A-A and B- B through the dissecting instrument in FIG. 14A;
- FIGS. 14E to 14G show side views of alternative dissecting jaw embodiments;
- FIGS. 15A to 15D show side views of alternative dissecting jaw embodiments;
- FIGS. 16A to 16D show a top view, a side view, a perspective view, and a bottom view of an appendage grasper embodiment;
- FIGS. 17A to 17C show side views of an atrial appendage closed during a
- FIGS. 18A to 18C and 19A to 19B show additional variations of an access device where the expandable member is slidable out of the elongate member;
- FIGS.20A to 2OB show an additional variation of an access device that is configured for use in a variety of traditional entry procedures;
- FIGS 21 A to 21 C illustrate additional aspects of the access devices as described herein;
- FIGS. 22A to 22C show a rail-member of the access device advancing out of the access device and a treatment device being advanced over the rail-member;
- FIGS. 23 A to 23B show additional variations of access devices having rail- members;
- FIG. 23C shows features that allow a user to selectively locate a rail-member relative to an access device
- FIGS. 24A to 24C illustrates a rail-member advanced to a target site and an arcuate profile or path so that a treatment device can be advanced over the rail member for treatment of the tissue;
- FIG. 25 illustrates an example of a lesion pattern created without dissection of pericardial reflections.
- Methods and devices described herein provide for improved manipulation of organs and/or instruments in the thoracic cavity.
- the methods and devices may allow for direct visualization along the posterior region of the heart and other anatomic structures not attainable with conventional thoracic approaches.
- the access devices described herein can be combined with a rail-member for accurate positioning of treatment devices over tissue.
- the methods and devices described herein may be used in conjunction with, or as an alternative to the conventional approaches described herein.
- the surgical approaches and procedures described herein rely on entry through the diaphragm of a patient to access a posterior region of that patient (the procedure hereafter referred to as "Diaphragm Entry for Posterior Access” or simply "DEPA").
- the DEPA procedure may also be referred as VAPS (Video-Assisted Pericardiac Surgery) or TAPS (Trans- Abdominal Pericardiac Surgery).
- FIGS. IA to IB show examples of placement of access devices 182 (also referred to as a separator or an elevator herein) under the methods for posterior access.
- an access device 182 is inserted through, at least a first, an abdominal, incision 168.
- the device is then advanced through the diaphragm (not shown) and placed adjacent or between organs for creation of a temporary cavity.
- FIG. IA illustrates one example, in this variation; the surgeon places the access 182 between heart and the spine such that the esophagus can be separated from the posterior surface of the heart.
- the method may be augmented with, one or two additional thoracostomy incisions allowing for placement of trocars 106. into the thoracic cavity.
- the . trocars 106 permit insertion of surgical tools or visualization devices.
- the access device 168 allows for direct visualization of the posterior surface of the organs during manipulation of the instruments inserted through the right and/or left thoracostomy access ports 106.
- use of the additional thoracostomy access sites with the access device 168 may permit the surgeon to visualize the anterior surfaces of anatomic structures, during the procedure. Once tissue obscures the surgical site from the surgeon's view via the thoracostomy access ports 106, the access device 168 allows the surgeon to have a posterior view of the surgical site.
- variations of the methods described herein include posterior access techniques using an access device 168 without additional thoracostomy access ports.
- FIGS. 1C to ID illustrate partial cross sectional views of a patient's thoracic cavity and abdomen to demonstrate a general principle of the DEPA procedure. For the sake of clarity, certain organs are not shown in the figures.
- FIG. 1C illustrates the DEPA procedure after the patient is prepared (as discussed herein) and after the DEPA incision is made within the abdomen. As shown, the DEPA incision allows entry of an access device 182 within the abdominal space and adjacent to a diaphragm 170. An incision in the diaphragm may be made using cutting features incorporated in the access device 182, a tool advanced through the access device 182, or via another tool advanced through another abdominal port or a thoracostomy port.
- FIG. ID shows an example of an access device 182 as it creates a temporary space within the thoracic cavity by separating the posterior ventricular surface 190 of the heart from the spine 218 and esophagus 220.
- the methods described herein contemplate creation of a temporary cavity about any organ such that the access device separates one or more additional organs from the desired surgical space.
- FIG. ID shows the expansion of expandable members 212 (e.g., as discussed below: inflatable bladders, expandable strands, etc.) to separate adjacent tissues and form a temporary cavity. Ih the variation shown, the access device 182 creates the temporary cavity at a posterior surface of the heart.
- expandable members 212 e.g., as discussed below: inflatable bladders, expandable strands, etc.
- the temporary cavity may be formed where needed including the various other organs and/or tissue surfaces within the body.
- This temporary cavity permits improved surgical and visual access to various tissue surfaces without the use of complex equipment.
- the improved access provides the surgeon the ability to perform additional procedures that would otherwise be difficult or impossible.
- FIGS. 2A to 2C illustrate side-sectional side views of the access device 182 when inserted through an opening in the diaphragm 240.
- the access device 182 enters the patient through an abdominal incision 168 below the diaphragm 170.
- the device 182 advances through diaphragm (e.g., via an incision 240) to access the posterior organ surfaces.
- the access device 182 defines a tube 210 having at least one working channel 211 through which the instruments can be inserted and manipulated.
- a scope 184 (hereafter a "DEPA scope”) can be used to visualize a substantial portion of the posterior heart (posterior atrium 188 and posterior ventricle 190) and/or other organs/tissue.
- the scope 184 transmits an image to an external monitor 181.
- expandable members 212 on the device may be actuated to create a temporary cavity within the body.
- the expandable members 212 comprise inflatable bladders or balloons that expose a posterior atrial surface 188 and a posterior ventricular surface 190 of the heart.
- entry into the thoracic cavity via the diaphragm allows the access device 182 to form a smooth transition/angle from the access site into the patient to the posterior surface of the organs in the thoracic cavity (e.g., heart, lungs, esophagus, etc.).
- the traditional approaches mentioned above require multiple steep angles that require excessive manipulation of devices and do not offer visualization without complex equipment. Such equipment introduces significant difficulty in manipulation and viewing perspective.
- the angle of entry provided by the access device 182 via the diaphragm 170 allows use of a straight scope, having a viewing angle between 0 and 60 degrees, to visualize the posterior surface of the organs.
- FIG. 2A Yet another benefit provided by the entry method of FIG. 2A is that a surgeon may manipulate instruments within the thoracic cavity in an easier and more controllable manner. For example, use of conventional techniques requires that a surgeon operate with a device having a near 90 degrees bend. Manipulation of such a device is difficult since pushing down directs the device away from tissue and the organs within the thoracic cavity interfere with the device when pulled upward. Use of relatively complex steerable equipment introduces complexity as well as reduces the surgeon's tactile feedback. [0077] FIG.
- FIGS. 3A to 3B 5 illustrate another variation of an access device 182.
- the device 182 includes expandable member 216 in the form of expandable stabilizer strands 216.
- the expandable member may comprise a set of Walloons or bladders.
- FIG. 2C illustrates another variation where the surgeon positions the access device 182 in the thoracic cavity.
- the surgeon may also use a second scope 184 advanced in a conventional manner as discussed above (e.g., through trocars 106 as shown in FIG. IA).
- the purpose of the second scope 184 is to view the anterior surface of the organs. This arrangement allows visualization of the anterior and posterior surfaces of the organ. Accordingly, as a surgeon performs a procedure on an anterior or posterior surface, as the surgeon breaks through to the opposite surface (i.e., the posterior or anterior surface) use of the two scopes 182 and 184 improves visualization.
- the DEPA scope maybe used merely for posterior visualization during a video assisted thoracostomy procedure.
- the device 182 includes expandable member 216 in the form of expandable stabilizer strands 216.
- the expandable members 216 actuate to separate the organs and define a temporary cavity.
- the expandable member-216 collapses, thereby causing closure of the temporary cavity.
- the expandable members 216 separate the esophagus 220 from the descending aorta 242 while also stabilizing both organs. This action serves to protect these anatomic structures while defining the temporary cavity.
- FIG. 3B illustrates placement of an ablation device 2 (e.g., as those described herein) through the working channel(s) 211 of the device 182.
- the temporary cavity permits visualization of a posterior surface of the organ (in this case the heart).
- This action allows the surgeon to ablate or treat the posterior surfaces of the heart.
- the surgeon may treat the pulmonary veins located on the posterior surfaces on the heart without having to dissect the veins from the heart.
- the access device 182 may have an aspiration tube or separate aspiration lumen to draw fluids from the surgical site.
- a surgeon would have to dissect the veins away from the heart's surface and then attempt to perform the procedure. Even in such a case, without posterior visualization, the surgeon is forced to treat portions of the veins blindly.
- a surgeon using a scope-type device such as a DEPA scope 184 as described above, as shown in FIG. 3C, can directly visualize the posterior surfaces of the heart and veins during the treatment.
- Another technique made possible through use of the access device 182 and diaphragm entry is that the surgeon can create a lesion on each side of a pulmonary vein (and in fact, an entire lesion pattern capable of treating atrial fibrillation) without having to dissect the pulmonary veins from the pulmonary artery, superior vena cava, or pericardium.
- the access device 182, as shown in FIG. 3B allows the surgeon to reach the inferior surface of the pulmonary veins 189 located on the posterior atrial surface 188. Therefore, the surgeon has access along each side of the left pulmonary veins, and each side of the right pulmonary veins. Furthermore, the surgeon may apply additional lesions to the posterior surface of the heart with minimal or no dissection of the pulmonary veins.
- FIG. 3 C also shows another variation of the DEPA methods, where an access device 182 separates adjacent tissue to create a temporary cavity.
- the surgeon then may advance treatment devices 2 and visualization devices (e.g., an endoscope 184) to the temporary cavity but external to the access device 182.
- the treatment device 2 permits creation of a lesion on the posterior surface of the heart and on the pulmonary veins.
- the access device 182 uses stabilizer strands 216, however, any variation of device may be used.
- FIGS. 3D to 3F illustrate another variation of a DEPA method that is made possible because of access to the posterior region of the heart.
- conventional approaches intending to apply coagulation devices to a posterior surface of the heart requires dissection of tissue to access the posterior surface.
- the coagulation device is inserted around the pulmonary vein that is dissected from cardiac tissue.
- the DEPA method provides direct access to the posterior surface of the heart, the pulmonary veins and surrounding atrial surface are directly visible and accessible without dissection of tissue.
- a treatment device 2 can access the posterior atrial surface 188, in this case around the pulmonary veins 164, without having to dissect tissue. . .
- FIG. 3D illustrates a variation of a treatment device 2 that has two opposing c- type electrodes. This device allows formation of a coagulation line around the pulmonary veins.
- FIG. 3E and 3F illustrate treatment devices 2 using a single c-type electrode configuration to form coagulation lines on the atrial surface 188 around each side of the pulmonary veins 164.
- FIG.4A illustrates another variation of a diaphragm-approach for treatment of tissue structures within the thoracic cavity.
- TMs approach is capable of treating thoracic tissue contacting the diaphragm without penetrating the diaphragm.
- the access device 182 advances to the diaphragm 240 without penetrating it.
- the surgeon places an ultrasound-device 254 (or other ablation energy emitted by a device capable of focusing . enough energy to heat tissue at distance greater than 1 inch from the device) having at least one ultrasound transducer against a surface of the diaphragm.
- the ultrasound device 254 focuses energy beyond the diaphragm 240 allowing for organs (e.g., heart tissue) to be treated without entering the thoracic cavity.
- the ultrasound-device 254 may use high frequency ultrasound (commonly referred to as HIFU) to treat structures through the diaphragm.
- HIFU device has an active surface of several transducers arranged in a phased array which are capable of radiating focused therapeutic ⁇ ultrasound energy at a fixed distance.
- the transducer itself may alternatively be capable of providing the focused ultrasound without requiring several transducers operating together.
- the ultrasound device 254 may contact the diaphragm adjacent to the right and left ventricles.
- the surgeon may then localize lesions and ablate tissue in • the heart by transmitting ultrasound through the HIFU probe without having to penetrate into the thoracic cavity.
- the ultrasound device 254 will incorporate a vacuum coupling and covering capable of forming a fluid tight seal with the diaphragm and use suction to engage the HIFU probe against the diaphragm thereby ensuring transmission of HIFU to the cardiac tissue without having interference of air or bone. Additional information regarding HIFU may be found on www.ushifu.com or www.internationalhifu. com.
- FIG. 4B illustrates another variation of a diaphragm-approach for treatment of tissue structures within the thoracic cavity.
- the access device 182 is used to dissect the esophagus 220 from esophageal vessels 221.
- the access device may create a temporary cavity on a surface of the esophagus 220 by moving it away fiom the vessels 221.
- the ultrasound-device 254 may be used to generate an image of perfusion patterns in the ventricles.
- the surgeon may use this imaging to identify slow conduction zones on the border of infarcted tissue.
- Such an approach may be used to treat ventricular tachycardia by mapping the perfusion flow patterns through the ventricular tissue and destroy those areas of tissue thought to cause the tachycardia. Regions responsible for inducing or maintaining ventricular tachyarrhythmias have been demonstrated to frequently occur in regions of slow and interspersed perfusion that can be delineated from completely infarcted tissue or viable tissue.
- the high frequency ultrasound or any other energy modality and implementation design capable of focusing energy into local areas spaced at known distances from the ablation device (in this case targeting tissue in the ventricles from the diaphragm) are used to ablate the imaged slow or interspersed perfusion patterns and eliminate potential substrates of ventricular tachycardias.
- Direct visualization of the posterior heart surface provides the surgeon with confidence when manipulating instruments along the cavity between the heart and lungs, and the spine and esophagus.
- An additional benefit of the DEPA process and associated devices is the ease of deployment due to the direct line to the posterior surface of the anatomy and the rapid healing post-procedure due to the absence of or limited deflation or other manipulation of the lungs when manipulating instruments along the posterior heart, the esophagus, or the posterior lung surfaces.
- the small incisions used to access the posterior heart surface during the DEPA process accelerates the healing process and reduces the visible scar.
- the invention contemplates use of any surgical device that may be advanced through the access device to perform any procedure that benefits from or requires posterior visualization of organs as described herein.
- the integrated vacuum coagulation probe embodiments in co-pending U.S. Patent Application Serial Nos. 11/208,465, Serial No. 10/425,251, and U.S. Patent 6,893,442 disclosed herein provide examples of devices that allow intimate contact specifically between a soft tissue surface and the energy portion of the device.
- the electrode(s) used to transmit energy is capable of heating the soft tissue until achieving irreversible injury making the soft tissue non-viable and unable to propagate electrical impulses, mutate, or reproduce.
- These integrated vacuum coagulation probe embodiments may be utilized during the DEPA process of the invention to coagulate soft tissue capable of treating atrial fibrillation, ventricular tachycardia or other arrhythmia substrate, or eliminating cancer in lung, or other soft thoracic tissue by destroying target cells.
- these integrated vacuum coagulation devices may be used to heat soft tissue along the posterior heart surface resulting in heat-induced contraction of collagen in such tissue thereby resulting shrinking of said soft tissue.
- heating the mitral valve annulus along the posterior atrio-ventricular groove may induce shrinking of the annulus thereby correcting mitral valve regurgitation.
- the invention is not limited to the above described vacuum coagulation probes. Instead, any number of coagulation, ablation, or surgical devices maybe used as required.
- the DEPA process and associated devices provide direct access to the posterior surface of the heart or lungs, or the esophagus, ascending or descending aorta, pulmonary artery, or other soft tissue structure, and enable manipulation of tissue structures to complete the desired surgical procedure.
- the DEPA process facilitates accessing and visualizing the posterior left and right atria when creating lesions of structurally strong but electrically non-viable tissue along the atria to treat atrial fibrillation, atrial flutter, or other supraventricular tachycardia, or along the ventricles to treat ventricular tachycardia.
- such devices and methods could simplify and improve other soft tissue coagulation procedures by ensuring direct visualization while precisely and effectively heating a region of soft tissue.
- the DEPA enables instrument manipulation and visualization for other cardiac (or non-cardiac) procedures that required accessing the posterior heart (or posterior lung or other anatomy between the posterior heart/lungs and the spine).
- DEPA process will facilitate mitral valve .compression procedures that involve placing patches or other compressive mechanism along the posterior mitral valve annulus adjacent to the posterior commisseur that is commonly associated with deformation due to ischemic injury or other cause of mitral regurgitation.
- mitral valve .compression procedures that involve placing patches or other compressive mechanism along the posterior mitral valve annulus adjacent to the posterior commisseur that is commonly associated with deformation due to ischemic injury or other cause of mitral regurgitation.
- such treatment procedures as those described in pending U.S. Application Serial Number 10/269,844 entitled "Systems for Heart Treatment” may benefit from tibe DEPA process and devices because it enables direct access to the posterior surface of the heart and the target anatomic structures.
- the DEPA process and device embodiments also enable reliable and controlled coagulation of soft tissue during less invasive procedures.
- Electrode(s) or antennas transmit energy (radiofirequency, direct current, ultrasonic, laser, infrared, or microwave) into tissue to cause the targeted soft tissue to heat thereby causing cellular responses that result in inhibiting conduction of electrical stimuli through the tissue cells but maintaining structural strength of the soft tissue.
- energy radiation (radiofirequency, direct current, ultrasonic, laser, infrared, or microwave) into tissue to cause the targeted soft tissue to heat thereby causing cellular responses that result in inhibiting conduction of electrical stimuli through the tissue cells but maintaining structural strength of the soft tissue.
- a cryogenic mechanism may be used to cool tissue below the isotherm of irreversible conduction block thereby rendering the tissue non-functional but structurally viable.
- DEPA process embodiments and associated devices of the invention as applied to treating atrial fibrillation are described as an augmentation to other surgical access or as a stand alone surgical access.
- the DEPA process and associated devices of the invention may be used to augment other surgical access (e.g. thoracostomy, subxyphoid, mini- stemotomy. etc.) or may replace all other surgical access and provide the sole access for performing the surgical procedure.
- the patient is taken to the operating room and placed in a supine position with the arms adductive and flexed at the elbows to expose both axilla, as shown in FIG. 5A.
- the patient's legs maybe placed in stirrups similar to the technique described for Lap Nissen fundoplication, which allows the surgeon to stand between the patient's legs and
- the patient is positioned so that maximum exposure is obtained to the lateral aspects of the chest wall from the waistline to the axilla. This may be facilitated by use of an operating table that narrows along the thoracic area to expose more of the sides of the patient's thoracic cavity and enables rotation of the patient along the thoracic cavity.
- the patient's lower extremities may be strapped across the waist and the legs within the stirrups to provide security to the bed.
- the upper thorax, arms, neck, and head may be secured to the bed to prevent the patient from slipping or sliding during extreme Trendelenburg (to angle A) as shown in FIG. 5A and extreme rotation to the left and right.
- a specialized operating table may be configured to provide the restraint, freedom of movement (from angle A (e.g. 30°) in FIG. 5 A to angle B (e.g 30°) in FIG. 5B), and exposure described above.
- the patient is intubated with an endotracheal tube; the bronchial lumen of the double lumen endotracheal tube is placed in the left main stem bronchus to facilitate individual inflation / deflation of the right and left lung lobes.
- Arterial monitoring is obtained via a radial artery and a Swan Ganz catheter is positioned via the right or left internal jugular for hemodynamic monitoring throughout the procedure.
- a transesophageal echocardiogram is used to visualize the heart and investigate function and the presence of thrombus.
- the stomach is emptied by the nasal gastric tube, and a foley catheter is inserted to drain the bladder.
- the patient is shaved from the waist to the axilla, and from left edge of the table to the right edge of the table.
- the patient is then prepped and draped to expose the clavicle to the waistline and to both sides of the bed for maximum exposure of the thorax, ⁇ and abdominal cavity.
- the left lung may be deflated by closing the endotracheal tube lumen feeding the left lung while the patient undergoes single right lung ventilation.
- thoracoscopy is performed by making a small incision 226 in the axillary line just beneath the left nipple at the 7th intercostals space for placement of a thoracoscope.
- a 2nd incision 228 is made anterior of the latissimus muscle in the mid-axillary line for retraction.
- a 3rd incision 230 is made more inferiorly and posteriorly to the latissimus muscle in the mid-axillary line.
- An additional incision 232 may be necessary anteriorly along the 4th or 5th intercostals space beneath the left pectoralis muscle, perhaps in the mammary crease.
- a vertical skin incision 168 is made in the mid-line approximately 3 to 7 cm below the xyphoid process, on the abdomen side of the diaphragm, as shown in FIG. 5D.
- This incision site is significantly below (e.g. at least 3 to 7 cm below) any incision used for previously disclosed sternotomy, thoracotomy, or subxyphoid access into the thoracic cavity, all of which are located on the thoracic side of the diaphragm.
- FIG. 5D The abdomen and its contents are visualized through the incisions.
- an additional incision 172 is made approximately 5 mm in size beneath the right subcostal area with a 3rd incision 174 of the abdomen being made hi the same area on the left subcostal area.
- an additional 5 mm port 234 is placed below the vertical incision to assist hi retracting the left hepatic of liver away from the midline diaphragmatic area.
- incisions may alternatively be used for liver procedures involving coagulating and/or resecting liver tissue to eliminate cancer or for other abdominal procedures involving coagulating and/or resecting cancerous tissue.
- the diaphragm is grasped on both sides with Babcock clamps and a vertical incision is made in the mid-line of the diaphragm 3 cm anterior to the eras. This incision is extended thru the diaphragm until the pericardium is identified. It should be noted that this incision places the operator directly beneath the posterior surface of the heart providing direct access to the posterior atria.
- the pericardium is identified, it is grasped with endoscopic Babcock clamps and opened sharply with, scissors. The pericardium opening is then continued allowing pericardial fluid to clear into the abdomen; this fluid is aspirated with suction. [00106] Next, the surgeon performs the DEPA procedure. As described above with regards to FIGS. IA to 3F 5 the access device 182 is inserted through the abdomen and diaphragm and within the thoracic cavity. Creation of the temporary cavity exposes the posterior surface of the organ (in this case, the heart).
- the left pericardium where the pericardium is opened with forceps, and scissors thoracoscopically through, the left chest.
- a pericardial incision is made posteriorly beneath the left phrenic nerve along the anterior border of the. left inferior pulmonary vein toward the superior pulmonary vein.
- Traction suture is placed in the pericardium and the pericardium is retracted anteriorly.
- a second retraction suture is placed posteriorly and retracted inferiorly to allow adequate exposure to the left inferior pulmonary vein region.
- the anterior pericardium is divided toward the left superior pulmonary vein to allow identification of the groove between the left superior pulmonary vein and the pulmonary artery.
- the pericardial incision can be made anterior to the phrenic nerve and extended inferiorly along the border of the phrenic nerve or the phrenic nerve can be isolated and liberated between the two incisions, one anterior and one posterior to the phrenic nerve leaving the phrenic nerve intact yet bridged between the diaphragm inlet of the super-most portion of the phrenic nerve and the thorax.
- the exposure of the left atrial appendage may be obtained via an incision anterior to the left phrenic nerve more superiorly upon the pericardium.
- a right angle and sharp scissors are used to dissect the pulmonary vein and left upper lobe of the lung is liberated to allow the left lung to fall into the left chest. Elevation of the patient in reversed Trendelenburg may assist in dropping the lung more inferiorly allowing better exposure of the pulmonary veins in this area.
- the right angle is passed over the left superior pulmonary vein and is visualized with the diaphragm accessed pericardial endoscope. Once the right angle is viewed with the diaphragm accessed scope, an umbilical tape (or vessel loop, or other atraumatic elongate tether) is grasped using the pericardial grasping device through the separator / elevator central tube. This allows attachment of the coagulation device to this umbilical tape (or vessel loop, or other atraumatic elongate tether). It also allows traction on the pulmonary vein to position the coagulation device in a more appropriate location along the pulmonary vein.
- the coagulation device is then advanced from behind and inferior to the left inferior pulmonary vein by attaching the device to the umbilical tape to above the left superior pulmonary vein. The device is then pulled and visualized with the DEPA scope to be in the appropriate position behind the pulmonary veins. Once the coagulation device is appropriately positioned from inferior and posterior to the left inferior pulmonary vein to the left superior pulmonary vein but in the posterior pericardium, the coagulation device is placed into contact (e.g. via vacuum application for the vacuum integrated devices referenced above) with the left atrium. This position is directly viewed with the DEPA scope prior .to transmitting the energy through the coagulation device and into soft tissue.
- the coagulation device is further retracted along the superior pulmonary vein and anterior to complete the top of the superior pulmonary vein coagulation. Once visualization is verified by the DEPA scope, the coagulation is performed. At this point, the completion of the pulmonary vein isolation is performed by completing the anterior coagulation line using the thorascope to visualize the appropriate position of the coagulation device and confirm tissue contact with the coagulation mechanism. [0103] At this point, a coagulation line is created toward the left atrial appendage from the pulmonary vein coagulation lines taking care not to damage the phrenic nerve. This position is performed by direct visualization with the thorascope. Once this coagulation line is completed via the left thorax, attention is turned to the left atrial appendage.
- FIGS. 16A to 16D show an example of an appendage grasper 200.
- the appendage closure mechanism as shown in FIGS. 17A to 17C is applied under direct visualization from the "thorascope. Staples 194, clips 196, clamp 198, sutures, or other mechanism maybe applied to close the left atrial appendage 250. If staples, clips, or sutures are used, pericardium may be incorporated into the closure site to prevent bleeding.
- the umbilical tape is then repositioned across the top of the left superior pulmonary vein and remains within the pericardium as far to the right as possible.
- the left lung is re-inflated leaving the umbilical tape posterior towards the right superior pulmonary vein.
- the right lung is then allowed to deflate fully using similar thoracoscope ports and position as the left, described above.
- a right thoracoscopy is performed, as shown in FIG. IA, and again the pericardium is liberated anteriorly to the phrenic nerve to allow exposure of the right inferior pulmonary vein, the space between the inferior vena cava and the right inferior pulmonary vein.
- the right pulmonary vein is liberated from the pulmonary artery and the superior portion right of the right superior pulmonary vein.
- the right angle is visualized to be within the pericardium by the DEPA scope.
- umbilical tape is positioned in this area and grasped by the DEPA grasping instrument.
- the umbilical tape is placed towards the right inferior pulmonary vein.
- the coagulation device is positioned from inferiorly along the posterior right pulmonary vein along the left atrium.
- Traction with the umbilical tape assists with positioning the device posteriorly.
- the coagulation device is actuated to coagulate a line of soft tissue.
- the right pulmonary veins are. coagulated in a similar fashion to the left . pulmonary veins described above, using assistance of the umbilical tape.
- the anterior line along the right pulmonary veins is performed under direct visualization from the right thorascope. Additional exposure of the intra-atrial groove, separating the right atrium from the pericardium, may provide better positioning of the coagulation device.
- the coagulation device is activated and the right pulmonary vein isolation is completed.
- the umbilical tape that remained placed in the left pulmonary veins is grasped from above the superior pulmonary veins using the DEPA scope to assist this position.
- the umbilical tape is pulled into the right chest from the left chest and is attached to the coagulation device.
- the coagulation device is positioned along the posterior left atrium. Positioning of the coagulation device is conducted under direct visualization from the DEPA scope. After position is confirmed, the coagulation device is activated creating a line of coagulated tissue.
- the access device.168 may require asymmetric expansion to further rotate the heart relative to the patient, depending on the patient's body, anatomy orientation, and table configuration.
- the coagulation device After creating all desired left atrial coagulation lines, the coagulation device is positioned from behind the inferior vena cava using the DEPA scope and along the anterior-most portion of right atrium and is connected to the right pulmonary vein isolation coagulation line. Once positioned, the coagulation device is activated. This coagulation line continues around the medial portion of the inferior vena cava toward the coronary sinus. Coagulation is performed to the atrio-ventricular groove in this area with care to protect the right coronary artery. The coagulation is performed to the coronary sinus taking care to remain posterior to the coronary sinus and avoiding the AV node.
- FIG. 6A shows the completed coagulation line 191. After completion the coagulation device is removed, the DEPA scope is removed, the expandable member on the access device 168 compresses into a low profile allowing for retraction of the access device 168.
- a smooth mesh patch (having a width and length of approximately 3 cm x 3 cm) is used to cover the diaphragm incision and is stapled or sutured to the diaphragm. Once the diaphragm incision is repaired, the left lobe of the liver is released and the abdomen deflated. Both lungs are fully inflated. If no parenchymal injury to the lungs is observed, no chest tube is necessary. If parenchymal injury is noted, chest tubes are placed bilaterally with Heimlich valves and the patient is returned to a more upright reversed Trendelenburg position and both lungs are reinflated with suction on both catheters.
- TDEP A Stand Alone Diaphragm Entry for Posterior Access
- This embodiment describes a stand alone DEPA process that does not require additional surgical access through the thoracic cavity, and associated devices with during atrial fibrillation treatment procedures. Again, it should be noted that the following description entails a thorough description of this particular DEPA approach using an embodiment of a coagulation probe as described above and incorporated by reference.. However, the inventive method may involve fewer, additional, or variations of the detailed steps to perform any particular surgical procedure. Any such variations from the steps below are contemplated to be within the scope of the invention.
- the patient is prepped and intubated.
- the endotracheal tube may enable individual inflation and deflation of lung lobes; however the stand alone DEPA process may not require deflation or retraction of lungs due to the access location which comes up through the diaphragm directly adjacent the posterior left atrium and left ventricle. Elimination of the need to deflate or retract the lungs (not attainable with conventional surgical approaches) will provide a substantial benefit to patients by preventing lung damage and expediting patient recovery.
- TEE hemodynamic monitoring is performed throughout the procedure, and TEE is used to visualize the heart and investigate function and the presence of thrombus.
- the stomach is emptied by the nasal gastric tube, and a Foley catheter is inserted to drain the bladder.
- Various needles are inserted into the abdomen to insufflate the abdomen.
- a vertical skin incision is made in the mid-line approximately 3 to 7 cm below the xyphoid process, on the abdomen side of the diaphragm, as shown in FIG. 5D. This incision site is significantly below any incision used for previously described subxyphoid access into the thoracic cavity, which have been located on the thoracic side of the diaphragm.
- the diaphragm is grasped on both sides with Babcock clamps and a vertical incision is made in the mid-line of the diaphragm 3 cm anterior to the crus, until the pericardium is identified. Once the pericardium is identified, it is grasped with endoscopic clamps and opened.
- the surgeon performs the DEPA procedure.
- the access device 182 is inserted through the abdomen and diaphragm and within the thoracic cavity. Creation of the temporary cavity exposes the posterior surface of the organ (in this case, the heart).
- the pericardial reflections maybe dissected at regions 224, if necessary, as shown in FIGS. 13A and 13B to free the pulmonary veins 164 and/or inferior vena cava 202 to allow an access device 182 to further define the cavity between the posterior heart surface and the spine.
- a maneuverable dissector 124 as shown in FIGS. 13 A, 13B, 14A and 14B, maybe used to dissect the pericardial reflections or other interconnective tissue or fat.
- This dissector can be steered remotely to change the axis of the dissecting clamp relative to the separator/elevator thereby facilitating access of target tissue located off axis from the separator/elevator central lumen/opening.
- the central lumen 186 of the access device 182 may alternatively comprise an elliptical cross-section, as shown herein, such that rigid instruments can be rotated off axis and access the pericardial reflections without the need for remote steering in the dissector.
- this posterior access through the pericardium obviates the need to manipulate or avoid the phrenic nerves, which run along the anterior heart surface.
- the pericardial incision is made to fully expose the posterior left atrium and enable rotation of the heart via manipulation with the separator/elevator, rotating the patient, placing the patient in Trendelenburg or reverse Trendelenburg, or other technique.
- Traction sutures may be placed in the pericardium adjacent to the pericardial incision to further manipulate the heart.
- a grasping device e.g. clamp (deflectable or fixed), snare (deflectable or fixed), or preshaped clamp
- clamp deflectable or fixed
- snare deflectable or fixed
- preshaped clamp e.g. clamp (deflectable or fixed), snare (deflectable or fixed), or preshaped clamp
- a silastic tube, an umbilical tape, or other atraumatic tensile member 248 is advanced around the left pulmonary veins 164 using the grasping device 192, and is temporarily engaged to the coagulation device 2 to retract the coagulation device into position, as shown in -FIG. 13C.
- the coagulation device is then advanced partially or fully around the left pulmonary veins by advancing the coagulation device and/or retracting the umbilical tape.
- the position and engagement of the coagulation device is continuously visualized with the DEPA scope 184.
- the coagulation device is placed into contact (e.g. via vacuum application for the vacuum integrated devices referenced above) with the left atrium. This position is directly viewed with the DEPA scope prior to transmitting the energy through the coagulation device and into soft tissue.
- the coagulation device is further retracted along the left pulmonary veins to complete the isolating coagulation line, as shown in FIG. 6B. Once visualization is verified by the DEPA scope, the coagulation is performed. At this point, the completion of the left pulmonary vein isolation is confirmed using pacing techniques that demonstrate conduction block from the left pulmonary veins to the rest of the atria.
- a coagulation line is then created along the left atrial appendage from the left pulmonary vein coagulation line to the mitral valve annulus 206 at the location where the great vein and circumflex have branched away from the annulus exposing a segment of annulus along which no coronary vessels run, as shown in FIG. 6B. .
- This position is performed by direct visualization with the DEPA scope.
- the left atrial appendage is closed.
- the appendage grasper 200 shown in FIGS. 16 A to 16D is used to grasp the atrial appendage and the atrial appendage is retracted.
- the appendage closure mechanism is applied under direct visualization from the DEPA scope.
- Staples 194, clips 196, clamp 198, sutures, or other mechanism may be applied to close the left atrial appendage, as shown in FIGS. 17A to 17C. If staples, clips, or sutures are used, pericardium may he incorporated into the closure site to prevent bleeding. [0123]
- the coagulation device is then repositioned around the right pulmonary veins using the grasping mechanism described above and umbilical tape. It should be noted that the coagulation device may alternatively incorporate a preformed shape or steering mechanism that facilitates advancing and deflecting the coagulation mechanism along the posterior atria.
- the coagulation device is positioned, under direct visualization from the DEPA scope, around the right pulmonary veins and activated in serial steps that form lesion lines that intersect to form a complete lesion absent of gaps at the intersection(s).
- the coagulation device is positioned along the posterior left atrium 188 to intersect the left pulmonary vein and right pulmonary vein coagulation lines 191, as shown in FIG. 6B. Positioning of the coagulation device is again conducted under direct visualization from the DBPA scope. After position is confirmed, the coagulation device is activated creating a line of coagulated tissue.
- the separator/elevator may also incorporate asymmetric expansion to further rotate the heart (side-side, head-toe, or other planar relationship) relative to the patient, depending on the patient's body, anatomy orientation, and table configuration.
- the coagulation device is manipulated through the working channel of the access device or opening under the inferior vena cava to create a coagulation line from the inferior vena cava to the tricuspid annulus under the eustacian ridge. Once positioned, the coagulation device is activated. Alternatively or in addition a coagulation line may be extended from the inferior vena cava 202 to the coronary sinus as shown in FIG. 6B taking care to remain posterior to the coronary sinus and avoiding the AV node.
- the coagulation device is removed, the grasping instruments are removed, the DEPA scope is removed, and the access device is compressed into a low profile and retracted.
- a smooth mesh patch is used to cover the diaphragm incision and is stapled or sutured to the diaphragm.
- suture may be placed along the diaphragm to close the diaphragm incision without the need for a mesh patch.
- a small skin incision is made at the umbilicus and the abdomen is inflated appropriately with a laparoscope. After obtaining adequate inflation, an endoscope is inserted and an additional abdominal port incision is made in the right subcostal area to retract the left lobe of the liver superiorly to allow exposure of the esophageal hiatus. Two separate abdominal port incisions are made just inferior to the left and right costal margins to provide adequate mobilization and placement of the dissecting tools.
- the stomach and the gastric epiploic artery was carefully protected and the short gastric was divided. The gastric epiploic is protected so the gastric epiploic artery can be identified.
- the short gastric is identified and freed toward the spleen using a Harmonic Scalpel.
- the dissection is continued to the esophageal hiatus at the eras of the diaphragm. Attention is then turned to the first and second portion of the duodenum where dissection was performed laparoscopicly to mobilize the duodenum off the right kidney.
- the stomach is further mobilized.
- the dissection is extended toward the right crus of the diaphragm identifying the left gastric artery.
- the left gastric artery is carefully divided using endoscopic stapling and hemostasis is verified.
- the endoscopic pyloroplasty is performed using and endoscopic stapling device to applicate the duodenum over the pyloric and an anatomosis is created to prevent gastric outlet obstruction.
- the access device is placed behind, the esophagus and in singular, fashion,, the lateral esophageal vessels are divided from the esophagus. It is preferable to visualize the esophagus to confirm that it is free of all attachments.
- any pattern of curvilinear, transmural lesions may be created along the epicardial surface or the endocardial surface with the coagulation devices using the DEPA process in conjunction with another surgical access or as a stand alone process.
- One potential left atrial lesion pattern involves creating a "C” that passes from the mitral valve annulus 206 adjacent the left atrial appendage (where the great vein and the circumflex do not parallel the atrioventricular annulus but have curved towards the apex of the left ventricle) above the superior pulmonary vein and back towards the mitral valve annulus adjacent the right pulmonary veins; or below the inferior pulmonary veins and towards the anterior mitral valve annulus.
- Another left atrial lesion pattern involves creating a "V” where the intersection resides at the mitral valve annulus adjacent to the left atrial appendage and each segment passes on opposite sides of the pulmonary veins and ends adjacent to the interatrial septum.
- a stretched “B” with each curved segment extending around either the left pulmonary veins or the right pulmonary veins and the central links separated by a distance wherein the top line of the "B" connects to the mitral valve annulus adjacent the left atrial appendage may also be created.
- a stretched "S”, reverse “S”, or figure eight coagulation line 191 with the initiating point occurring at the mitral valve annulus adjacent to the left atrial appendage and curving from that base point encompasses the left and right pulmonary veins as pairs within the curved segments.
- FIG. 6D 5 two "C" lesions 191, one extending around the left pulmonary veins 164 and one extending around the right pulmonary veins 164, connect to the mitral valve annulus 206 and incorporate a flutter lesion extending from the inferior vena cava 202 to the tricuspid annulus.
- right atrial lesions may be created along the cristae terminalis, from the inferior vena cava to the superior vena cava, from the cristae terminalis to the tricuspic annulus, from the superior vena cava to the tricuspid annulus, or other geometry capable of preventing atrial flutter along the right atrium.
- FIG. 5C shows an alternative access that provides direct visualization and manipulation of the posterior heart surface or lungs.
- the patient is placed and restrained on his/her belly on the operating room table. As such, the patient's back is accessible by the surgeon. Gravity causes the heart, lungs and other anatomy to move away from the back providing space in which to access and manipulate instruments along the posterior heart or lungs.
- Two back incisions 236 and 238 are created away from the spine and trocars are placed to access the thoracic cavity from the back.
- the trocars are located adjacent the spine and away from the aorta and esophagus to provide direct access to the posterior heart and lungs.
- FIGS. 7A to 7C show an example of a novel access device 182 for creating a temporary cavity within the body.
- FIGS. 7A to 7C show, respectively, a top view, a side- sectional view, and an end view of an alternative access device 182.
- the device elevates organs and separates adjacent organs or tissue surfaces to create a surgical area within the body via creation of a temporary cavity.
- the device 182 incorporates two expandable members 212. As described herein, the device 182 may include any number of expandable members 212.
- the expandable members 212 expand about the elongate member 210 (also referred to as a guide tube) to separate and elevate organs to create the temporary cavity.
- the expandable members comprise two balloon bladders 212 (or a single balloon can be secured to the top and bottom of the elongate member 212 to define two bladders).
- the balloons 212 are oriented along the two opposing sides of the elongate member 210.
- the balloons 212 inflate as shown in FIGS. 7A and 7C, tfiey form a pillow-type support that fits around the spine and esophagus on one side and the heart on the other side.
- the balloons 212 serve not only to separate the organs, but also to stabilize them. It should be noted that the separation of the balloons on the elongate member does not need to be symmetric, as shown in FIG. 7C but may be different depending upon the particular application. For example, a shorter balloon can be used along the side of the device 182 that contacts the heart and a longer balloon can be used on the side of the device 182 that contacts the spine and esophagus, or vice-versa, depending on the patient anatomy.
- the balloons may be fabricated from silicone, urethane, polyester, PET, polyurethane, nylon, PEBAX, or other polymer capable of enlarging in response to being exposed to an inflation media.
- the guide tube 210 can be fabricated from any polymer and preferably has enough rigidity to provide column strength needed when inserting the access device into the space between organs (e.g., the . heart and the spine).
- the guide tube can be fabricated from polyurethane, PTFE, FEP, polyester, or other material that can be extruded or molded into the desired shape.
- the expandable members e.g., balloons 212 expand in anon-uniform manner about the elongate member 210.
- the balloon 212 expand away from the sides of the elongate member 210 more than they expand away from the top and bottom of the elongate member 210
- This particular configuration permits creation of the temporary cavity without moving the organs to far from the opening 186 or slot 187 of the elongate member 210.
- variations of the access device 182 include expandable members mat expand non- uniformly about the elongate member 210, the device includes variations where the expandable member expands in a uniform manner as well.
- the elongate member 210 includes at least one inflation lumen 214 that is fluidly coupled to the interior of one or both balloons 212.
- each balloon 212 may have an individual inflation lumen 214 to provide more control over inflation of the balloons and separation of the organs.
- the balloons may be inflated using saline, CO2, or other biocompatible fluid.
- the inflation lumens may be routed to the proximal end of the device including through ports in the handle.
- the individual balloons may be inflated to different pressures and/or volumes such that one balloon provides more separation than the other.
- this mechanism when used against the heart, this mechanism causes the heart to rotate in one direction or the other providing a mode of manipulating the heart within the thoracic cavity. For example, this manipulation allows instruments to better access the lateral surfaces of the heart, and/or even the anterior surface of the heart.
- FIG. 7C illustrates the elongate member 210 including one or more visualization elements 246.
- the visualization element may be an optic fiber, a CCD camera, a light source, etc.
- the optic fiber could be used to transmit light and illuminate the cavity defined by the access device 182.
- the access device 182 may incorporate near-field infrared transducers to identify blood vessels (veins and arteries) during use. By incorporating such near-field infrared transducers, the surgeon can identify blood vessels (e.g. the pulmonary veins, coronary sinus, esophageal vessels, or other small vessels while getting to the heart or separating the esophagus) and avoid them while dissecting or localizing them. Such near-field infrared technology can visualize vessels 2 mm under the surface of tissue.
- the device 182 includes a working channel 211 that permits delivery of surgical tools and/or scopes to the temporary cavity. This allows for creation of a surgical field at the temporary cavity.
- the working channel 211 terminates at the opening 186 at the distal end of the elongate member 210.
- FIGS. 7A to 7C illustrate the opening 211 at a front face of the device 182, the opening 211 maybe located at an end of the device 182 on a side as shown below.
- the device 182 may also include a slot-type opening 187 on one or more sides of the elongate member 210. The slot 187 permits access to a larger portion of the organ within the temporary cavity.
- the ends of the balloons 212 extend beyond the slot 187 improving the ability of the device to form the temporary cavity.
- the slot provides access to the posterior heart surface located within the contact region between the access device and the heart. Without the slot 187, the access is only beyond the opening 186 of the elongate member 210.
- variations of the access device 182 include elongate members 210 having non-circular cross sections (e.g., oval as shown). The non- circular cross section of the working channel 211 provides the ability to place multiple instruments through the access device 182.
- devices 182 of the present invention may be used with scopes having camera connections that are oriented at an angle (e.g. anywhere up to 90 degrees) from the scope shaft so the handles will not interfere with the scope camera.
- a planar surface 245 on one side of the device 182 permits an increased surface area contact between the device and tissue when creating the temporary cavity. This increased surface contact provides additional stability of the device 182 when in use.
- the expandable members 212 are shown to be placed on sides of the device 182 adjacent to the planar surface 245, additional variations of the device include expandable members on any surface/side of the device 182.
- a proximal end or proximal portion of the access device 182 is adapted to allow manipulation of the access device from outside of the body.
- FIG. 7A illustrates proximal handles 256 that allow manipulation of the access device 182 and also prevents pushing the proximal end of the elongate member 210 or access device 182 completely into the patient.
- a malleable or shapeable support 244 may be incorporated into the elongate member 210 to allow shaping the member into a desired configuration.
- the shape is selected to improve the ability of the device to direct the scope and instruments towards the desired site of a temporary cavity (e.g., posterior region of the' heart, or other anatomic structure).
- the support 244 may be placed in a support lumen such that the support 244 is slidable within the support lumen of the elongate member 210.
- the elongate member 210 may be fabricated from a shapeable material. Accordingly, the elongate member 210 could be shaped to a desired profile.
- FIG. 7C also illustrates the access device 182 as having an optional suction or aspiration lumen 262. Because the device is suited for creation of a temporary cavity to perform a surgical procedure under direct visualization, it will be important to keep the scope or visual element clear from bodily or other fluids. Accordingly, a suction device may be advanced through the working channel. Alternatively or in combination, a suction or aspiration lumen 262 may be placed within the elongate member 210.
- FIGS. 7D to 7E illustrate another variation of an access device 182. In this variation, the elongate member 210 is tapered from the proximal end the distal end.
- FIG. 7E illustrates a perspective profile of the tapered elongate member 210 (showing the various inflation and/or aspiration lumens).
- the cross-sectional profile of the working channel 211 maybe any geometric shape. However, shapes in which working channel width is not equal to the working channel height may be preferred (e.g., rectangular, oval, trapezoidal, etc.).
- FIG. 7C also demonstrates a variation of a device 182 where the expandable members 212 surround the distal end of the elongate member 210. This variation creates a space between the elongate member 210 and the organ.
- FIGS. 7F to 71 illustrate additional variations of access devices 182.
- the access device 182 may include an additional working lumen 272 within the elongate member 210.
- the additional working lumen 272 in this variation is separate from the working channel 211 and provides an access channel that permits the ability to leave a device at the temporary cavity while advancing and/or removing other devices without causing undue interference between devices.
- the additional working lumen 272 may be used to advance a scope-type device to the temporary cavity. In this manner, the scope-type device may be left in the working lumen 272 while other devices are inserted and manipulated in the working channel 211. This reduces the chance that the scope is disturbed.
- FIG. IG illustrates a front view of the access device 182 of FIG. 7F.
- the access device 182 includes a working channel 211, an additional working lumen 272, an inflation lumen 258 coupled to the expandable members 212 and an aspiration lumen 252.
- the multi-lumen access device 182 may be fabricated from a plurality of tubes having a covering or coating that defines the outer surface of the elongate member 210.
- the device 182 may include multiple expandable members 212 located at a distal end.
- FIG. 7H illustrates another variation of an multi-lumen access device 182.
- the access device 182 may comprise an elongate member 210 having a passage to serve as the working channel 211. Separate tubes or similar structures may be placed within the working channel 211 to form a working lumen 272, aspiration 252, and inflation lumen 258. These lumens may also be formed using an extruded multi-lumen elongate member 210.
- Fig. 71 illustrates a rear view of the access device 182 of FIG. 7H.
- the expandable members 212 may be formed from a single balloon bladder located about the distal end of the device 182.
- FIG. 7J show a variation of an access device 182 where the working channel
- proximal end of the working channel 211 may be tapered along an end of the elongate member (as shown) to increase the area through which instrumentation enters the working channel 211.
- FIGS. 8A to 8C show respective top, side, and bottom views of an access device 182 as described herein having both an expandable member 212 and separate stabilizers strands 216.
- the expandable member comprises a balloon 212 affixed to the elongate member 210 or guide tube.
- the elongate member 210 has a non- circular cross-section defining a working channel 211 (e.g. elliptical, rectangular as shown, trapezoidal, or any other geometric shape).
- the working channel 211 allows for access to the temporary artificial cavity formed by the device.
- the elongate member 210 may be shapeable or have a particular curve as discussed herein.
- the curve will be selected depending on the desired surgical application.
- the access device 182 may have a distal portion that is curved or angled as shown in Fig. 8B.
- the balloon is affixed along a planar side of the elongate member 210 such that the sides and bottom of the balloon are free and not attached.
- This configuration allows the balloon 212 to adjust to the spine, esophagus, and other structures while separating the heart with the stabilizer side of the elongate member 210.
- the stabilizer strands 216 may be fabricated to be malleable so that they fit around an organ and stabilize the organ during the procedure. For example, when used against the heart, the strands stabilize the heart as the balloon inflates to create the temporary cavity.
- the stabilizers 216 support the heart during manipulations of the instruments along the posterior surface of the heart or within the artificial cavity defined by the access device 182.
- the stabilizer strands 216 are preferably fabricated from the elongate member 210 by cutting slots and preshaping the stabilizing features.
- the stabilizer may alternatively be fabricated from another component (e.g. spring metal such as spring steel or nitinol) covered with an atraumatic polymer and secured to the guide tube.
- FIGS. 9A and 9B show an alternative access device 182 that incorporates expandable members comprising enlargeable strands 216 or stabilizers.
- the strands 216 may be preformed strands 216 or stabilizers fabricated from a spring material (e.g. a ⁇ flexible polymer, spring stainless steel, nickel titanium, or other metal treated to meet the elastic requirements of the device).
- the strands 216 assume a preshaped configuration upon deployment of the device.
- the strands 216 can be deformed during deployment to nest or separate the appropriate organ.
- the strands 216 may be malleable or resilient.
- the strands 216 have an expanded preshaped orientation. Wires may be used to retract the strands into a low profile. Once positioned, the wires may release the strands such that they expand radially outward into contact with the anatomy.
- the strands separate the heart from the spine and esophagus, providing a temporary cavity in which instruments can be inserted and scopes can provide direct visualization, (e.g., as shown in EIGS..3A to 3C).
- the strands 216 are actuated into an enlarged configuration upon positioning of the device.
- the strands 216 can be actuated to cause advancement or refraction of the strands.
- one end of the strand may be affixed to the elongate member 210, while the other end may be advanceable within the elongate member.
- the strands may be individually enlarged to permit selective separation of the heart thereby lifting one side of the heart and rotating the heart to access the lateral surfaces' and even the anterior surface of the heart.
- the strands 216 maybe of different sizes as shown in FIG. 9A where the strands on the top of the device have a smaller expanded profile than the strands on the lower portion of the device.
- the stabilizing strands 216 designed to be atraumatic.
- the space between the two sets of strands can be set based on the anatomic and/or procedure requirements.
- FIGS. 9C and 9D show another variation of an access device 182 comprising a balloon 212 surrounding two expandable strands 216.
- the balloon 212 in this configuration, is attached to the strands and defines a free balloon along the side opposite to the strands. As such, when the strands 216 expand they enlarge the balloon and contact the spine region to provide a stabilizing point. As the balloon inflates using inflation media delivered through the inflation lumen 214, the balloon also surrounds the organ being separated. This fonctiori provides an atraumatic surface while separating and stabilizing the organs.
- FIGS. 1-10 For example, as the balloon inflates to separate the heart from adjacent organs, inflation of the balloon forms an atraumatic surface to support the heart.
- this variation of the device 182 may also be used when rotated 180 degrees so the expandable strands support the heart and the free side of the balloon contacts the spine and esophagus.
- the balloon is attached to the guide tube distal and proximal to the strands to define a fluid impervious bond.
- the two strands may be individually actuated to permit selective separation of the heart thereby lifting one side of the heart and rotating the heart to access the lateral surfaces and even the anterior surface of the heart.
- FIGS. 11 A and 1 IB show an end portion of an access device 182 that comprises a series of enlargeable strands 216 along two sides of the elliptical elongate member 210.
- FIG. HB shows the strands 216 in a compressed, low profile configuration.
- FIGS. 12A to 12C show another variation of an access device 182.
- the device 182 incorporates three balloons 212 where two balloons 212 are oriented along the top of the elongate member 210 and a single balloon 212 is located at the bottom of the elongated 210.
- the balloons 212 may have pre-determined shapes that are useful when performing various procedures.
- the bottom balloon 212 has a semi-circular groove on a surface that is opposite to the elongate member. This groove permits nesting of various organs (e.g., the spine or the esophagus) when creating the temporary cavity.
- FIGS. 12D to 12F illustrate another variation of an access device 182.
- the balloons 212 are selected to have a rectangular cross section when viewed co- axially along the elongate member 210 (as shown in FIG. 12D).
- Balloon 212 for use with the present device 182 may have any type of cross-section.
- the balloons may have varying shapes to accommodate certain organs or to create clearance at the opening 186 of the device 182. Such balloons may be pre-formed to a specific shape or cross-section.
- non-distensible balloons may also be employed with variations of the device.
- FIG. 12D also shows the distal end of the elongate member 210 as being curved or angled to allow for a larger opening 186. Such a configuration permits greater access to the surface of the organ adjacent to the temporary cavity.
- the elongate member 210 may further include a plurality of aspiration/suction ports 262 located at an end of the device.
- FIG. 12F illustrates yet another variation of an access device 182 where a length of one balloon member 212 is greater than the length of a second balloon member 212. Such a difference in length may be selected depending upon the desired procedure.
- a single balloon 212 maybe employed where a portion of the balloon on one side of the elongate member 210 is shorter/longer than a portion of the same balloon on another side of the elongate member 210.
- FIG. 12G shows a variation of an access device 182 where at least a portion of the balloon members 212 extend beyond the opening 186 of the elongate member 210. This configuration assists in spacing tissue from the opening 186 and reduces the probability that the tissue would otherwise obscure the visualization element (e.g., an endoscope) within the working channel 211 of the device 182. As shown, the device 182 may further include suction or aspiration ports 262 within the working channel 211 of the device and adjacent to the opening 186.
- the visualization element e.g., an endoscope
- FIG. 12H illustrates a variation of an access device 182 in which the profile of the balloons 212 allows for clearance around the opening 186 of the working channel 211. Accordingly, a length of the balloon 212 adjacent to the elongate member 210 is less than a length of the balloon 212 at a surface away from the elongate member 212.
- FIG. 12H also shows a variation of the access device 182 as having locking members or balloons 264. The locking balloons 265 may be spaced from the distal end of the device 182 sufficiently so that upon inflation, they secure the device at the site by expanding within the body or outside of the body at the site of the incision.
- FIG. 12J shows a front view of the access device 182 of FIG. 12H.
- FIG. 12J illustrates another variation of an access device 182 where the balloon members 212 are axially spaced along the elongate member 210.
- FIGS. 18A to 18C illustrates a variation of an access device 182 having an expandable member 266 that is slidable within the working channel 211 of the elongate member 210. As the expandable member 266 advances out of the elongate member 210, the expandable member expands in a manner that elevates and separates organs. As shown, the expandable member of FIG.
- FIG. 18 A comprises a first and second set 268, 270 of arms. La this variation, the sets of arms 268, 270 expand in a non-uniform manner about the elongate 210 member.
- FIG. 18B shows a side view of the access device of FIG. 18A when the first and second set 268, 270 of the aims extends from the elongate member.
- FIG. 18C. shows the first and second set.268,.27.0 of arms retracted within the elongate, member 210.
- FIGS. 19A to 19B illustrate a variation of the access device 182 similar to the one shown in FIGS. 18A to ISC. However, in this variation, the access device 182 includes a first and second set 268, 270 of arms without spacing between the individual arms.
- FIGS. 20A to 2OB illustrate yet another variation of an access device 182.
- an access device 182 may also be used in parts of the body apart from the DEPA process.
- the access device 182 has a curved shape to assist in positioning of the device 182 when advanced directly into the chest cavity during, for example, a s ⁇ b-xyphoid approach as opposed to through the diaphragm 170.
- the shape of the access device 182 will vary depending on the procedure and intended entry procedure.
- the expandable members 212 of the access device 182 may be inflated to elevate and separate organs to form a temporary cavity.
- variations of the present access devices 182 include elongate members that • are curved, shapeable, or flexible to accommodate placement through the traditional entry techniques mentioned above.
- FIG. 21A shows additional features for use with access devices described herein.
- the illustration shows an access device 182 having an expandable member at a distal end of an elongate member 210.
- the elongate member may have a reinforcing member 282 extending over all or a portion of the elongate member 210. While the illustrated reinforcing member 282-is external to the elongate member 210, it may be located interior to, exterior to, or within the walls of the elongate member 210.
- the reinforcing member 282 may be a braided support, a coiled support, a mesh support or any such type of support that reinforces the elongate member 210.
- the access device 182 may optionally have any number of handles, or other features that allow manipulation of the device.
- FIG. 21 A also shows a rail-member 282 extending through the access member 182.
- the rail-member 282 can be a coiled guide-wire, an atraumatic guide-wire, polymeric strand or tube, or any similar structure.
- the rail-member 282 has a portion that is affixed relative to the elongate member 282 and an axially moveable portion that extends within the elongate member 210. Ih- most cases-, the rail-member should not cause trauma to the intended region of tissue. For example, if use near cardiac tissue, the rail-member should be of a sufficient diameter so that it does not inadvertently cut or damage cardiac tissue.
- the far portion.284 of the rail-member 282 is affixed to within the elongate member 210 so that distal movement of the remaining portion of the rail-member 282 causes an intermediary or mid-portion of the rail-member 282 to assume an arcuate profile, shape or perimeter (hereafter referred to as an arcuate profile) 288.
- the shape formed is a semi-circular open-ended profile.
- the rail- member 282 can be fabricated to form any number of shapes.
- the entire rail- member or a portion of the rail-member may have a pre-determined profile such that advancement of the rail-member out of the access device 182 causes the rail-member to assume the profile.
- the profile may be any geometric shape desired.
- the rail-member 282 is affixed to an inflation lumen 214 of the elongate member 210.
- the rail-member 282 maybe affixed anywhere within or outside of the elongate member 210.
- additional variations include rail- members extending exterior to (or partially exterior to) the elongate member 210.
- FIG. 21A also illustrates the access device 182 as having a valve 290.
- the valve 290 may be a duck-bill valve that partially extends within the working lumen of the elongate member 210. Such a valve closes around the item being passed through the working channel.
- any type of valve can be used depending on the desired application.
- FIG. 21B illustrates a cross sectional view of the access device 182 of FIG. 2 IA.
- the rail-member 282 extends through the working channel 211 and through a valve 290 (in this case a duckbill valve) at the proximal end of the elongate member 210.
- a valve 290 in this case a duckbill valve
- the rail-member 282 is fabricated from a material such as a shape- memory alloy, a super-elastic alloy, metal alloy, polymer, or polymeric blend of materials. In most cases, the rail-member 282 is intended to function as a rail for the advancement of various medical implements.
- FIG. 21C shows a top view of the access device 182 of FIG. 21 A.
- access devices 182 according to the present invention. may include one or more slots 187 adjacent to the opening 186 at the distal end of the elongate member 210. This slot 187 has been particularly useful to manipulate/rotate instruments within the working channel 211.
- the expandable member 212 is formed round the slot 187 so that upon expansion, the expandable member 212 does not occlude the temporary cavity space that is adjacent to the slot 187.
- FIG. 22A shows an example of the rail-member 282 in use.
- the expandable member 212 is not shown in an inflated position. During use of the device, the expandable 212 member may be fully or partially expanded. Alternatively, the expandable member 212 need not be expanded during use. As shown, the mid-section 288 of the rail-member 282 remains within the device 182. Also, in this illustration, the far end of the rail-member 282 is affixed within the working channel 211 of the access device 182.
- FIG. 22B illustrates axial movement of the rail-member 282, particularly distal movement of the near end 286 of the rail member 282.
- the mid-section 288 assumes an arcuate profile.
- the profile of the mid section 288 is shown to be an open-ended loop.
- any number of shapes are contemplated to be within the scope of this invention.
- FIG. 22C shows the advancement of a treatment device 300 over the rail member 282.
- the treatment device 300 will include a rail-lumen or track allowing for the device 300 to advance along the rail-member 282 and ultimately take the shape of the profile of the mid-section 288.
- the treatment device 300 can include an electrode 302 for treatment of tissue. As shown, the electrode 302 may optionally also take the shape of the mid section 288.
- the rail- member 282 is advanced out of the access device 182 while over the tissue to be treated.
- the rail-member 282 provides the ability of the medical practitioner to position treatment devices 300 with greater precision.
- the access device 182 with rail-member has also shown considerable promise in positioning treatment devices 182 over posterior regions of organs in the thoracic cavity as described herein.
- FIG. 23 A illustrates another variation of an access device 182 as discussed above having handles 256 with the addition of a rail-member.
- the rail- member 282 expands substantially distally to the opening 186 of the access device 182.
- FIG. 23B illustrates another variation of an access device 182 according to the present invention.
- the access device 182 may include an additional working lumen 272 within the elongate member 210.
- the additional working lumen 272 in this variation is separate from the working channel 211 and provides an access channel having the ability to leave a device at the temporary cavity while advancing and/or removing other devices without causing undue interference between devices.
- the rail member 282 is affixed within the working channel 211 of the device.
- the rail-member 282 may also be affixed to the additional working lumen 272.
- the rail-member 282 may be a separate or separable from the body of the acess device 182 and temporarily affixed into a lumen or receptacle in the access device 182 to provide a rail-type function over which treatment device can be advanced.
- This separate/separable feature permits use of a single rail-member that can be inserted into the working channel 211 of the access device 182 and can be used to guide the treatment devices to their intended location.
- the elongate member 210 of the access device 182 can incorporate one or more multiple lumens through which the rail member 282 can be advanced.
- variations of the access device 182 may have one or more opening 292 to temporarily or permanently attach or advance a rail-member 282
- the device 182 may have openings, apertures, notches or other such features in place of openings 292.
- openings 292 or other features that allows the user to change the location of the rail-member on or within the elongate member 211.
- such features allow for the user to change the shape of the loops created by the rail-member or to otherwise manipulate the rail-member relative to the access device 182.
- the rail-member 282 expands in profile on the right side of the access device 282.
- the user can select how the rail-member 282 expands in profile.
- FIGS. 24A-24C illustrate the access devices 182, as described herein, when used in video assisted procedures such as pericardiac surgery or trans-abdominal pericardiac surgery.
- the access devices described herein allow for direct visualization and exposure to the posterior surface of organs within the thoracic cavity.
- the illustrated examples demonstrate how the access devices enable access to posterior regions of the heart for the creation of exterior Maze lesions.
- the use of the access device 182 also optionally allows a surgeon to create such lesions without dissection of the pericardial reflections (a line .of folding along which the visceral .pericardium becomes the parietal pericardium). This ability to create lesions without dissection of this tissue enables a faster procedure as well as improved recovery time.
- these devices may also have wider applications and, unless otherwise indicated, their uses are not limited to any particular type of surgery.
- a surgeon advances a guidewire or rail-member 282 to (or near) the intended treatment site.
- the rail-member 282 may be advanced by itself and subsequently joined with the access device 182.
- the placement of the rail- member 282 may rely on one or more additional guide-wires.
- the rail- member may have a floppy distal end (or both ends may be floppy.) As the distal end is placed along or near the target tissue, it maybe fed into the access device 182.
- a treatment device such as a coagulation device, can then be fed over the rail-member to apply the desired treatment.
- a surgeon when treating the heart, may placing a guidewire that functions as the rail-member through an access location (port, incision, etc.), along the roof of the left atriaum (after dissecting the superior vena cava, the aorta, and the pulmonary artery).
- the surgeon advances the guide-wire along the anterior surface of the left pulmonary vein and into the access device.
- a coagulation device can then be fed over the guidewire to create the roof lesion and an anterior pulmonary vein lesion.
- the same or similar techniques may be used when placing the guidewire along the anterior right pulmonary vein to create right atrial or other lesions.
- FIG. 24B illustrates advancement of an access device 182. Variations of the procedure include first advancing the access device 182 and positioning the acess device (the expandable members may or may not be expanded) then advancing the the rail- member through the access device. ' Once the rail-member is in a desired location, it may then be affixed or joined to the access device. Alternatively, the rail-member 282 maybe positioned and then the access device can be positioned over the rail-member 282 at or near the target site. Ultimately, the rail-member 282 is affixed or joined to the access device 182.
- the acess device the expandable members may or may not be expanded
- FIG. 24C illustrates the rail-member 282 after affixing or joining with the access device 182.
- an end of the rail-member 282 can be manipulated by the medical practitioner to assume a profile or shape suited for guiding a treatment device.
- the rail-member 282 itself may actually be used to grasp or cut tissue.
- the edges of the rail- member are selected so ast to be atraumatic to tissue as the medical practitioner positions the rail-member 282 within the body.
- FIG. 24C also shows a treatment device 300 advanced over the rail-member 282.
- the rail-member 282 and/or treatment device 300 may then be manipulated to positioning the treatment device 300 over or on the tissue to create the desired lesion or treatment pattern.
- the access devices described above are not limited in the devices that are advanced over the rail-member, it was found that ablation catheters having suction capabilities allowed for improved contact between the electrode and tissue being coagulated. In addition, it was found useful to include a lubricious material (such as a polyimide tube) when advancing the coagulation devices over the rail-member. In addition, such devices were constructed to have significant stiffness and torque characteristics to aid in manipulation of the devices at the target region. [0192] Examples of such probes are disclosed in: U.S. Patent Application No. to be determined and filed on the same day as this application, entitled “Vacuum Coagulation Probes", (Attorney Docket No. NCNT-N-Z009.00-US); U.S.
- FIG. 25 illustrates one example of lesion patterns 191 created on a posterior surface of the heart using the access device and probes referenced herein. These lesion patterns 191 avoid the need to dissect pericardial reflections from the pulmonary veins because the devices allow for creating lesions along the pericardial reflections rather than through them. Dissecting / Tunneling Embodiments [0194] FIGS. 13A and 13B show the advantages of the DEPA process and associated dissecting/tunneling tool 124 device embodiments that provide direct visualization and . exposure to the pericardial reflection in order that are designed to remove or separate adipose tissue (e.g. fat) and/or interconnective tissue from the heart to expose muscle layers and permit maneuvering the coagulation device or other instrumentation into engagement with heart tissue at any location, whether or not previously covered by fat or interconnective tissue.
- adipose tissue e.g. fat
- FIGS. 14A to 14D show two side views and two cross-sectional views (at lines A-A and B-B respectively) of a dissecting/tunneling tool 124 embodiment capable of separating fat tissue.
- a shaft 98 supports two flexing segments 96, one at the proximal end adjacent to the handle 102 and the other at the distal end adjacent the dissecting legs 72.
- Four pull-wires 16 oriented at 90 degree intervals around a central axis are deflected by the handle and movement of the handle relative to the shaft at the proximal flex region 96 to cause the distal dissecting segment to correspondingly pivot at the distal flex region 96.
- the distal leg actuation 142 is advanced over the legs 72 to cause the legs to close and is retracted to urge the legs to open.
- FIGS. 14E to 14G and 15A to 15D show alternative leg 72 and distal pivoting 96 configurations for various dissecting/tunneling instrument 124 embodiments. Appendage Grasper / Positioner
- FIGS. 16A to 16D show an appendage grasper 200 that stabilizes the atrial appendage and repositions the atrial appendage during the coagulation process and/or appendage isolation process.
- the appendage grasper 200 incorporates a vacuum lumen 6 that is coupled to a vacuum opening 28 in the covering 7 that defines an opening 20 that applies suction to the atrial appendage and pulls the atrial appendage into engagement with the grasper during manipulation of the atrial appendage.
- FIGS. 17A to 17C show an appendage 250 that is closed with staples 194, snaps 196 or a clamp 198 during a DEPA process where diaphragm access to the posterior heart surface provides additional visualization of the left or right atrial appendage while closing the atrial appendage from the outside surface of the atrium.
- the separator/elevator may incorporate individually adjustable enlargement mechanisms (e.g. bladders or strands) to enable rotating the heart which provides additional access to the lateral surface of the heart. Augmenting this with thoracic access to the left atrial appendage enables grasping the appendage (e.g. with the grasper 200) and applying staples 194, snaps 196,. a clamp 198, or other mechanism capable of closing the orifice of the .atrial appendage and preventing blood inside the atrial appendage from communicating with (e.g. flowing into) the rest of the atrium.
- Diaphragm Patch e.g. bladders or strands
- a diaphragm patch measuring approximately 3 cm x 3 cm maybe used to close the diaphragm incision after the DEPA procedure has been completed and the incisions are to be closed.
- the patch may be fabricated from expanded PTFE, woven polyester, or other atraumatic polymer capable of being sewn or staples to the diaphragm such fhat when the entire circumference is sewn or staples, a fluid impervious surface is created along the DEPA incision through the diaphragm.
- the patch may also incorporate pledgeted outer surface to facilitate sewing and/or stapling and prevent bleeding during the patching step of the procedure.
- a separator/elevator, a coagulation device, an endoscope, a dissecting/tunneling instrument, trocars, a diaphragm patch, and staples to close the diaphragm opening may be incorporated into a kit used for atrial fibrillation or ventricular tachycardia treatment using a DEPA procedure.
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Abstract
Description
Claims
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PCT/US2006/060749 WO2008057117A1 (en) | 2006-11-09 | 2006-11-09 | Diaphragm entry for posterior surgical access |
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- 2006-11-09 JP JP2009536212A patent/JP5256206B2/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
EP2086387A4 (en) | 2014-03-12 |
JP2010508959A (en) | 2010-03-25 |
WO2008057117A1 (en) | 2008-05-15 |
JP5256206B2 (en) | 2013-08-07 |
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