US20190336676A1 - Convertible multi-stage / bi-caval femoral venous cannula - Google Patents
Convertible multi-stage / bi-caval femoral venous cannula Download PDFInfo
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- US20190336676A1 US20190336676A1 US16/513,575 US201916513575A US2019336676A1 US 20190336676 A1 US20190336676 A1 US 20190336676A1 US 201916513575 A US201916513575 A US 201916513575A US 2019336676 A1 US2019336676 A1 US 2019336676A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
- A61M1/3621—Extra-corporeal blood circuits
- A61M1/3653—Interfaces between patient blood circulation and extra-corporal blood circuit
- A61M1/3659—Cannulae pertaining to extracorporeal circulation
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits
- A61M1/3621—Extra-corporeal blood circuits
- A61M1/3666—Cardiac or cardiopulmonary bypass, e.g. heart-lung machines
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/0045—Catheters; Hollow probes characterised by structural features multi-layered, e.g. coated
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
- A61M25/0068—Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
- A61M25/007—Side holes, e.g. their profiles or arrangements; Provisions to keep side holes unblocked
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
- A61M25/0074—Dynamic characteristics of the catheter tip, e.g. openable, closable, expandable or deformable
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
- A61M25/0074—Dynamic characteristics of the catheter tip, e.g. openable, closable, expandable or deformable
- A61M2025/0079—Separate user-activated means, e.g. guidewires, guide tubes, balloon catheters or sheaths, for sealing off an orifice, e.g. a lumen or side holes, of a catheter
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2205/00—General characteristics of the apparatus
- A61M2205/04—General characteristics of the apparatus implanted
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2210/00—Anatomical parts of the body
- A61M2210/12—Blood circulatory system
- A61M2210/125—Heart
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M2210/00—Anatomical parts of the body
- A61M2210/12—Blood circulatory system
- A61M2210/127—Aorta
Definitions
- the present application generally concerns venous cannulae, and more specifically, to a venous drainage cannula or catheter that can be adjustable for application in various different cardiac surgery procedures involving cardiopulmonary bypass.
- cardiopulmonary bypass Various different surgical procedures are or can be performed using cardiopulmonary bypass. Such “on-pump” cardiopulmonary bypass procedures may be necessary or favorable in situations where heart function must be interrupted, while circulation must be continued in a patient. For example, in cardiac surgeries where the heart wall is opened to gain access to one or more chambers of the heart, cardiopulmonary bypass can be used to temporarily replace the heart function and support blood oxygenation and circulation, while the heart can be emptied of blood in order to more easily facilitate the particular surgical procedure.
- a pump or similar machine is connected to the veins and arteries near the heart.
- Deoxygenated or venous blood that is returning to the heart is removed from the body by one or more cannulae or other devices.
- cannulae are positioned in the right atrium, in the superior vena cava and/or the inferior vena cava, and/or further away from the heart, for example, in the femoral vein, to intercept the deoxygenated blood that would otherwise return to the heart.
- Withdrawn blood is then oxygenated and further processed, and returned to the body, for example, into the ascending aorta. In this manner, a patient's body can remain oxygenated while, for example, a cardiac procedure is being performed.
- cardiopulmonary bypass surgery involves insertion of two separate venous cannula for separate blood withdrawal at the superior vena cava and the inferior vena cava.
- a first cannula is positioned in the superior vena cava
- a second cannula is positioned in the inferior vena cava.
- both the superior and inferior venae cavae are then clamped or otherwise sealed from the right atrium. In this manner, blood is drained or withdrawn from the body by the two cannulae prior to reaching the heart.
- mini-sternotomy approaches to heart valve repair or replacement procedures where only part of the sternum or breastbone is split or separated to gain access to the heart, are gaining popularity in lieu of, for example, the same procedures where a standard sternotomy (i.e., where the entire sternum is separated) is performed.
- femoral venous cannula have gained popularity in such procedures. Femoral venous cannulae are inserted through the femoral vein at or near the groin or thigh area, away from the surgical field. The cannula is advanced through the femoral vein and up through the inferior vena cava towards the heart.
- the end region of a femoral venous cannula is generally long, with multiple stages of openings, and is positioned to traverse the right atrium, with at least one set of openings positioned in the superior vena cava and one set of openings positioned in the inferior vena cava to effect blood drainage.
- a femoral venous cannula can therefore replace the use of the two separate single stage cannula used in traditional cardiopulmonary bypass procedures, and so reduces the total number of parts required for a cardiopulmonary bypass, and may also reduce the number of incisions that are required at the surgical site.
- the access site of the femoral venous cannula is away from the surgical site (e.g., at the groin or thigh), the use of femoral venous cannulae can also serve to reduce clutter or crowding at the surgical site.
- femoral venous cannulae are used for procedures on the left and right sides of a heart, respectively.
- a multi-stage femoral venous cannula may be utilized, where drainage is performed on each of the superior vena cava, the inferior vena cava, and the right atrium.
- the use of a multi-stage cannula for these procedures may be beneficial, for example, for more effective blood drainage.
- Such multi-stage cannulae may include drainage openings along an entire end portion of the cannulae, for example, as seen in FIG. 1 , so that the openings can be simultaneously positioned in the superior vena cava, the right atrium, and the inferior vena cava.
- a bi-caval drainage approach may be more desirable, where drainage occurs only at the superior vena cava and the inferior vena cava, but not at the right atrium, so that the surgical procedure can be more easily performed there.
- a different bi-caval cannula may be used in these circumstances, where openings at the end portion of the cannula are interrupted by a central or middle portion that does not include any openings, for example, as seen in FIG. 2 .
- Use of such a bi-caval cannula can still drain blood at the superior and inferior venae cavae, while the right atrium is isolated for the surgical procedure.
- multiple surgical procedures need to be made on a single patient.
- a patient may require replacement or repair of an aortic or mitral valve, as well as a separate procedure on a tricuspid valve.
- a surgeon may need to perform separate procedures on the right and left sides of the heart of a patient.
- such situations involved the complete removal of a first type of femoral venous cannula after completion of the first procedure, and insertion of a second type of femoral venous cannula before beginning the second procedure.
- An object of the invention is to provide a femoral venous cannula device that is adjustable between a multi-stage cannula and a bi-caval cannula, for example, to reduce the number of parts needed for cardiopulmonary bypass surgery. Another object of the invention is to provide such an adjustable cannula, to add flexibility and simplify procedures in situations where different cannulae are traditionally required.
- embodiments of the invention provide a convertible femoral venous cannula that can be modified to be used in both procedures requiring a multi-stage cannula and procedures requiring a bi-caval cannula.
- Embodiments of the invention further provide a femoral venous cannula where a variety of different hole or opening configurations can be achieved, to adapt to various different procedures.
- a device for use in cardiopulmonary bypass includes a cannula configured to be positioned in at least one of a right atrium, a superior vena cava, or an inferior vena cava of a patient, the cannula having a first end, a second end, and a longitudinal axis extending between the first end and the second end.
- the cannula includes a first section at the first end, the first section including an outer wall and having at least one opening therethrough, a second section connected to the first section along the longitudinal axis, the second section including an outer wall and having at least one opening therethrough, and a third section connected to the second section along the longitudinal axis on a side of the second section opposite the first section, the third section including an outer wall and having at least one opening therethrough.
- the openings in each of the first section, the second section, and the third section are respectively open to inner spaces defined by the first section, the second section, and the third section.
- the at least one opening in the second section is occluded to restrict communication with the inner space defined by the second section, while the openings in the first section and the third section remain open to the inner spaces defined by the first section and the third section, respectively.
- a method for adjusting and positioning a femoral venous cannula in a patient for cardiopulmonary bypass during a cardiac procedure.
- the cannula has a first end, a second end, and a longitudinal axis extending between the first end and the second end, and includes a first section at the first end and including an outer wall and having at least one opening therethrough, a second section connected to the first section along the longitudinal axis and including an outer wall and having at least one opening therethrough, and a third section connected to the second section along the longitudinal axis on a side of the second section opposite the first section and including an outer wall and having at least one opening therethrough.
- the openings in each of the first section, the second section, and the third section are respectively open to inner spaces defined by the first section, the second section, and the third section, while in a second configuration, the at least one opening in the second section is occluded to restrict communication with the inner space defined by the second section, while the openings in the first section and the third section remain open to the inner spaces defined by the first section and the third section, respectively.
- the method includes adjusting the cannula to one of the first configuration or the second configuration, inserting the cannula through the femoral vein of the patient and advancing the cannula towards the heart of the patient, and positioning the cannula at a first position in the patient wherein the at least one opening of the first section of the cannula is arranged in the superior vena cava, the at least one opening of the second section of the cannula is arranged in the right atrium, and the at least one opening of the third section of the cannula is arranged in the inferior vena cava.
- Embodiments of the invention therefore provide a femoral venous cannula device that is convertible between a multi-stage cannula and a bi-caval cannula for different surgical procedures.
- FIG. 1 shows a multi-stage femoral venous cannula
- FIG. 2 shows a bi-caval femoral venous cannula
- FIG. 3 shows a femoral venous cannula that is positioned at a heart for a cardiopulmonary bypass procedure according to an embodiment of the invention
- FIG. 4 shows a femoral venous cannula configured as a multi-stage cannula according to a first embodiment of the invention
- FIG. 5 shows a cross-sectional view of the femoral venous cannula of FIG. 4 , where the cross section includes a longitudinal axis of the cannula;
- FIGS. 6A and 6B show cross-sectional views of the femoral venous cannula of FIG. 4 in a first position and a second position, respectively, the cross-section taken in a plane perpendicular to the longitudinal axis of the cannula;
- FIG. 7 shows an enlarged view of an end the femoral venous cannula of FIG. 4 , where the cannula is configured as a bi-caval cannula;
- FIGS. 8A and 8B show an enlarged view of a femoral venous cannula according to a second embodiment of the invention, in a first position and a second position, respectively;
- FIGS. 9A and 9B show a multi-stage femoral venous cannula and a sleeve, respectively, according to a third embodiment of the invention.
- FIG. 10 shows the cannula and the sleeve in FIGS. 8A and 8B in an assembled state.
- FIG. 3 shows a heart and a femoral venous cannula according to an embodiment of the invention.
- the right atrium 110 of the heart 100 is connected to the inferior vena cava 111 , which connects the veins located in the lower part of the patient's body to the heart 100 , and the superior vena cava 112 , which connects the veins located in the upper part of the patient's body to the heart 100 .
- Deoxygenated blood generally empties from the inferior vena cava 111 and the superior vena cava 112 into the right atrium 110 , to be oxygenated and recirculated through the body.
- a femoral venous cannula 1 according to an embodiment of the invention has been positioned through the inferior vena cava 111 and the right atrium 110 , and protrudes into the superior vena cava 112 .
- the cannula 1 is positioned in this manner to drain the patient's body of deoxygenated blood, and to deliver the blood to, for example, a cardiopulmonary bypass pump or machine, for oxygenation and further processing, before being returned to the patient's body.
- the cannula 1 has a first section 10 and a second section 20 .
- Each of the first and second sections 10 , 20 may be substantially cylindrical.
- the sections 10 , 20 are flexible to ease insertion and positioning in the body, and one or both sections 10 , 20 may be wire reinforced.
- Each section 10 , 20 includes at least one opening 11 , and typically a plurality of openings 11 .
- the openings 11 in FIGS. 3 and 4 are circular.
- the openings 11 in the first section 10 may be shaped and/or arranged substantially similarly to the openings 11 in the second section 20 .
- the openings 11 in the first section 10 may have different shapes and/or spacing than the openings 11 in the second section 20 , based on the particular clinical application and/or patient characteristics.
- a distal end of the first section 10 of the cannula 1 may be tapered or otherwise shaped to further ease insertion of the cannula 1 through the body.
- the sections 10 and 20 are separated by a third section 30 , which include one or more openings 31 , and generally a plurality of openings 31 .
- the openings 31 in the embodiment in FIGS. 3 and 4 are illustrated as being square or rectangular shaped to be more easily distinguishable from the openings 11 .
- the openings 31 may be the same shape (e.g., round, similar to how openings 11 are illustrated in the figures), and have the same spacing, as the openings 11 in either sections 10 or 20 .
- the section 30 may be configured similarly to the sections 10 and 20 . That is, the section 30 may also be substantially cylindrical, may be flexible, and/or may be wire-reinforced.
- the section 30 may be configured differently than the sections 10 and 20 , for example, the section 30 may be made of a semi-rigid material that is more rigid than a material used for the sections 10 and 20 , and may not be wire-reinforced.
- the sections 10 , 20 , 30 may further be connected to an elongated tubular section 40 that connects the cannula 1 to the outside of the patient, for example, first for facilitating insertion and positioning of the cannula 1 , and later for connection to a cardiopulmonary bypass pump.
- the cannula 1 in a final position, is positioned so that the first section 10 is located in or approximate the superior vena cava 112 , the second section 20 is located in or approximate the inferior vena cava 111 , and the central third section 30 is located in or approximate the right atrium 110 of the heart 100 .
- a length of the central section 30 is sufficiently long to extend from the inferior vena cava 111 to the superior vena cava 112 , so that the holes 11 in sections 10 and 20 are only positioned in the inferior and superior venae cavae 111 , 112 , and not in the right atrium 110 .
- different sized cannula with, for example, different widths or central sections 30 having different lengths, may be available for selection, depending on characteristics of the patient.
- the cannula 1 can be inserted, for example, via the femoral vein near the thigh or groin of the patient, and advanced towards the heart 100 through the inferior vena cava 111 . In other embodiments, it may be possible to insert the cannula 1 in the opposite direction via the superior vena cava 112 , or from another access point.
- the cannula 1 is configured as a multi-stage cannula, where the holes or openings 11 and 31 in each of the sections 10 , 20 , and 30 are open and facilitate drainage of deoxygenated blood from the body.
- the multi-stage cannula configuration illustrated in FIGS. 3 and 4 may be used, for example, during aortic or mitral valve replacement or repair procedures.
- embodiments of the invention provide a convertible cannula, where the central section 30 of the cannula 1 can be adjusted so that the openings 31 are sealed shut instead of kept open, to effectively convert the cannula 1 from a multi-stage cannula to a bi-caval cannula, so that the same cannula 1 can be used for different cardiac surgeries and procedures which require either type of cannulation.
- section 30 of cannula 1 includes a shutter system.
- the cannula 1 may include an outer wall 32 and an inner wall 34 , where the inner wall 34 defines an inner lumen 12 , and where a separate space is formed between the inner wall 34 and the outer wall 32 .
- the inner lumen 12 may connect to the section 10 at the distal end of the cannula 1 , for example, for facilitating drainage from the openings 11 in section 10 .
- the outer wall 32 defines the openings 31 , which extend through the outer wall 32 into a space between the inner wall 34 and the outer wall 32 , to facilitate drainage by the cannula 1 through the openings 31 .
- the inner lumen 12 may also communicate with the space between the inner wall 34 and the outer wall 32 , or the inner wall 34 may be omitted, so that the openings 11 and 31 open into a same space inside the cannula 1 .
- the shutter system further includes at least one sliding wall 33 positioned along an inner surface of the outer wall 32 .
- the sliding wall 33 may include a plurality of longitudinal strips that extend along a length of the section 30 between the sections 10 and 20 .
- the sliding wall 33 may be a substantially cylindrical wall that is slightly smaller in diameter or width than the outer wall 32 , and that includes openings that are either substantially the same size or larger than the openings 31 .
- the sliding wall 33 In a first position, as illustrated in FIGS. 5 and 6A , the sliding wall 33 is positioned so that the openings in the sliding wall 33 are aligned with the openings 31 in the outer wall 32 , so that the sliding wall 33 does not block the openings 31 or obstruct access into the space between the inner wall 34 and the outer wall 32 .
- the sliding wall 33 In a second position, as illustrated in FIGS. 6B and 7 , the sliding wall 33 can be rotated relative to the outer wall 32 of section 30 so that the sliding wall 33 occludes or blocks the openings 31 , and thus blocks access into the cannula 1 from the openings 31 , while the openings 11 of cannula 1 remain open. Therefore, in the configuration shown in FIG.
- the cannula 1 has been converted to function as a bi-caval cannula, where drainage occurs at the inferior and superior venae cavae 111 , 112 through sections 20 , 10 , but no longer occurs at the right atrium 110 , since the openings 31 are now blocked.
- the bi-caval cannula configuration illustrated in FIG. 7 may be used, for example, during procedures where access to the right chambers of the heart are required, such as during tricuspid repair or replacement, and/or where drainage at the right atrium 110 may not be needed or desired, or may hinder or obstruct the particular procedure.
- the internal sliding wall 33 slides over the holes 31 in section 30 , effectively opening and closing the holes 31 based on the requirements of the particular procedure.
- the shutter system in FIGS. 3-7 may be remotely activated, for example, through an electronic switch system that can be actuated from outside the patient's body.
- the sliding wall 33 may be mechanically rotated, for example, via a lever or similar mechanism at or near the section 30 of the cannula, or for example, a similar mechanism that connects to the outside of the patient's body through the tubular section 40 .
- a central section 30 ′ of a cannula may instead include one or more sliding walls 35 that move laterally or longitudinally along the length of the cannula, rather than rotate relative to the rest of the cannula.
- the sliding wall 35 in FIGS. 8A and 8B may include, for example, a series of ring-shaped strips that are slightly smaller in diameter or width than the outer wall 32 , or may include one substantially cylindrical wall that has openings substantially the same size or larger than the openings 31 .
- FIGS. 8A and 8B may be similar to those discussed with respect to FIGS. 3-7 .
- the sliding shutter walls 33 , 35 are located along an inner surface of outer wall 32 .
- the sliding walls 33 , 35 can be positioned on the outside of the cannula, or can be tightly sandwiched between two layers of the section 30 .
- the sections 30 , 30 ′ and/or the sliding shutter wall 33 , 35 are described as being semi-rigid and made of a stiffer material than a material of the sections 10 and 20 , but in some embodiments, the sections 30 , 30 ′ and/or the sliding shutter wall 33 , 35 may be constructed similarly to the sections 10 , 20 , and can also be wire-reinforced. Various other modifications can also be made to the described embodiments without departing from the general scope of the invention.
- FIGS. 9A, 9B, and 10 A third embodiment of the invention is illustrated in FIGS. 9A, 9B, and 10 .
- a kit including a cannula 2 and an elastic tube or covering sheath 3 are provided.
- the cannula 2 can be, for example, a general multi-stage femoral venous cannula, such as the multi-stage cannula illustrated in FIG. 1 .
- the cannula can include a plurality of holes or openings 11 along the length of the cannula 2 , which are spaced apart and extend sufficiently along a length of the cannula 2 for the openings 11 to be positionable in the right atrium 110 , the inferior vena cava 111 , and the superior vena cava 112 of a patient simultaneously.
- the elastic sheath or tube 3 is generally constructed of a material so as to be impermeable to blood.
- the tube 3 may include, for example, an adhesive 4 that is applied along the ends of the tube 3 (as illustrated), or alternatively, along an entire inner surface of the tube 3 .
- the adhesive 4 provided will generally be strong enough to allow the tube 3 to permanently adhere to the cannula 2 .
- the adhesive may initially be rolled out or covered, and then uncovered or rolled down once the tube 3 is arranged at a desired position relative to the cannula 2 .
- Other variants of the adhesive type and/or application with respect to the surfaces of the tube 3 can also be used.
- the tube 3 can adhere to the cannula through adhesives as discussed, or for example, via elastic properties or an interference fit.
- a shrink wrap or similar material may be utilized for covering the desired openings 11 in cannula 2 .
- a surgeon or other practitioner can attach the tube 3 over the cannula 2 through, for example, a puncture or access site through the heart wall, or alternatively, tube 3 can be attached upon removal of the cannula 2 from the patient's body.
- the adhesive or other adhering means will hold the tube 3 in position on the cannula 2 , generally to cover the central openings 11 corresponding to the position of the right atrium, so that the modified cannula 2 can function as a bi-caval cannula during a subsequent procedure.
- the elastic sheath or tube 3 can be applied to currently existing multi-stage femoral venous cannula, and so additional cannulae according to the invention may not need to be provided.
- the cannula 2 By covering the openings 11 along a central portion of the cannula 2 , the cannula 2 can be converted from a multi-stage cannula to a bi-caval cannula, so long as openings 11 remain uncovered at both a distal end and a proximal end relative to the positioning of the tube 3 .
- the kit including cannula 2 and tube 3 may also be advantageous in that tubing of different sizes, lengths, and/or configurations can be provided, to provide a simple customizable cannula based on the particular patient's anatomy.
- the parts of the cannulae 1 , 2 according to embodiments of the invention are preferably made from one or more biocompatible materials, and may all be made of the same material, or can be made of different materials.
- each of the embodiments discussed above provides a single cannula that can be converted from a multi-stage cannula to a bi-caval cannula on demand, where a physician or other practitioner can close different holes along the cannula to adjust the hole configurations of the cannula to suit the particular clinical application.
- the cannula can further be converted from a bi-caval cannula to a multi-stage cannula as well, for example, by opening different holes, adding more flexibility for the physician.
- Embodiments of the invention would provide a cannula that would allow for customization of hole configurations, which could potentially reduce the number of products or product codes to stock.
- cannulae according to embodiments of the invention could replace both multi-stage cannula and bi-caval cannula, so that only a single type of cannulae can be stocked to cover both types of applications.
- Embodiments of the invention would also allow more flexibility with respect to customization based on surgeon preference and patient anatomy, for example, different heart and/or vein sizes.
- embodiments of the invention provide a more flexible cannula that can be adjusted mid-procedure.
- Previously in instances where one of a multi-stage cannula or a bi-caval cannula is required for a first procedure, and then the other of the multi-stage cannula or the bi-caval cannula is required for a second procedure, upon completion of the first procedure, the first cannula had to be removed and the second cannula then inserted and repositioned before the second procedure could be performed.
- a single cannula can be positioned for the first procedure, and for example, adjusted to first serve as a multi-stage cannula, and can then be converted for the second procedure, for example, to serve as a bi-caval cannula, while still correctly positioned relative to the heart, so that removal and repositioning of the cannula is no longer required, thereby reducing surgical times and simplifying the surgical process.
- a conventional multi-stage cannula can still be used for a first procedure, and tubing of different lengths can be provided, where an appropriate sealing tube can potentially be selected or cut mid-procedure, and then applied to the cannula, to seal the desired number of openings on the cannula based on the patient's anatomy, thereby providing a more customizable and effective bi-caval cannula.
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Abstract
Description
- This application is a continuation of International Patent Application No. PCT/US2017/013645, filed Jan. 16, 2017, the entire disclosure which in incorporated by reference.
- The present application generally concerns venous cannulae, and more specifically, to a venous drainage cannula or catheter that can be adjustable for application in various different cardiac surgery procedures involving cardiopulmonary bypass.
- Various different surgical procedures are or can be performed using cardiopulmonary bypass. Such “on-pump” cardiopulmonary bypass procedures may be necessary or favorable in situations where heart function must be interrupted, while circulation must be continued in a patient. For example, in cardiac surgeries where the heart wall is opened to gain access to one or more chambers of the heart, cardiopulmonary bypass can be used to temporarily replace the heart function and support blood oxygenation and circulation, while the heart can be emptied of blood in order to more easily facilitate the particular surgical procedure.
- During a cardiopulmonary bypass, a pump or similar machine is connected to the veins and arteries near the heart. Deoxygenated or venous blood that is returning to the heart is removed from the body by one or more cannulae or other devices. Generally, such cannulae are positioned in the right atrium, in the superior vena cava and/or the inferior vena cava, and/or further away from the heart, for example, in the femoral vein, to intercept the deoxygenated blood that would otherwise return to the heart. Withdrawn blood is then oxygenated and further processed, and returned to the body, for example, into the ascending aorta. In this manner, a patient's body can remain oxygenated while, for example, a cardiac procedure is being performed.
- Traditionally, cardiopulmonary bypass surgery involves insertion of two separate venous cannula for separate blood withdrawal at the superior vena cava and the inferior vena cava. To prevent blood from entering the heart during a cardiac surgical procedure, a first cannula is positioned in the superior vena cava, and a second cannula is positioned in the inferior vena cava. In some instances, both the superior and inferior venae cavae are then clamped or otherwise sealed from the right atrium. In this manner, blood is drained or withdrawn from the body by the two cannulae prior to reaching the heart.
- Recently, more research and emphasis has been placed on less invasive surgical procedures which involve, for example, a lower number of and/or smaller incisions for performing the same procedures. In the field of cardiac surgery, such procedural modifications may include reducing wound opening sizes and/or reducing the number of parts required at the surgical site. For example, mini-sternotomy approaches to heart valve repair or replacement procedures, where only part of the sternum or breastbone is split or separated to gain access to the heart, are gaining popularity in lieu of, for example, the same procedures where a standard sternotomy (i.e., where the entire sternum is separated) is performed.
- Since a mini-sternotomy may only yield an incision that may be approximately half the length of an incision made in a standard sternotomy, there is a need or desire to reduce the number of surgical parts and instruments which require access to the main incision site. In recent years, femoral venous cannula have gained popularity in such procedures. Femoral venous cannulae are inserted through the femoral vein at or near the groin or thigh area, away from the surgical field. The cannula is advanced through the femoral vein and up through the inferior vena cava towards the heart. The end region of a femoral venous cannula is generally long, with multiple stages of openings, and is positioned to traverse the right atrium, with at least one set of openings positioned in the superior vena cava and one set of openings positioned in the inferior vena cava to effect blood drainage. Such a femoral venous cannula can therefore replace the use of the two separate single stage cannula used in traditional cardiopulmonary bypass procedures, and so reduces the total number of parts required for a cardiopulmonary bypass, and may also reduce the number of incisions that are required at the surgical site. Furthermore, since the access site of the femoral venous cannula is away from the surgical site (e.g., at the groin or thigh), the use of femoral venous cannulae can also serve to reduce clutter or crowding at the surgical site.
- Generally, different femoral venous cannulae are used for procedures on the left and right sides of a heart, respectively. For example, for aortic valve or mitral valve replacement or repair, a multi-stage femoral venous cannula may be utilized, where drainage is performed on each of the superior vena cava, the inferior vena cava, and the right atrium. The use of a multi-stage cannula for these procedures may be beneficial, for example, for more effective blood drainage. Such multi-stage cannulae may include drainage openings along an entire end portion of the cannulae, for example, as seen in
FIG. 1 , so that the openings can be simultaneously positioned in the superior vena cava, the right atrium, and the inferior vena cava. - However, for some procedures, surgical access to the right atrium, or more generally to the right chambers of the heart, may be required, for example, for tricuspid valve replacement or repair. In these situations, a bi-caval drainage approach may be more desirable, where drainage occurs only at the superior vena cava and the inferior vena cava, but not at the right atrium, so that the surgical procedure can be more easily performed there. Typically, a different bi-caval cannula may be used in these circumstances, where openings at the end portion of the cannula are interrupted by a central or middle portion that does not include any openings, for example, as seen in
FIG. 2 . Use of such a bi-caval cannula can still drain blood at the superior and inferior venae cavae, while the right atrium is isolated for the surgical procedure. - In some instances, multiple surgical procedures need to be made on a single patient. For example, a patient may require replacement or repair of an aortic or mitral valve, as well as a separate procedure on a tricuspid valve. Or more generally, a surgeon may need to perform separate procedures on the right and left sides of the heart of a patient. Previously, such situations involved the complete removal of a first type of femoral venous cannula after completion of the first procedure, and insertion of a second type of femoral venous cannula before beginning the second procedure.
- An object of the invention is to provide a femoral venous cannula device that is adjustable between a multi-stage cannula and a bi-caval cannula, for example, to reduce the number of parts needed for cardiopulmonary bypass surgery. Another object of the invention is to provide such an adjustable cannula, to add flexibility and simplify procedures in situations where different cannulae are traditionally required. In accordance with the objects of the invention, embodiments of the invention provide a convertible femoral venous cannula that can be modified to be used in both procedures requiring a multi-stage cannula and procedures requiring a bi-caval cannula. Embodiments of the invention further provide a femoral venous cannula where a variety of different hole or opening configurations can be achieved, to adapt to various different procedures.
- According to one embodiment, a device for use in cardiopulmonary bypass includes a cannula configured to be positioned in at least one of a right atrium, a superior vena cava, or an inferior vena cava of a patient, the cannula having a first end, a second end, and a longitudinal axis extending between the first end and the second end. The cannula includes a first section at the first end, the first section including an outer wall and having at least one opening therethrough, a second section connected to the first section along the longitudinal axis, the second section including an outer wall and having at least one opening therethrough, and a third section connected to the second section along the longitudinal axis on a side of the second section opposite the first section, the third section including an outer wall and having at least one opening therethrough. In a first configuration, the openings in each of the first section, the second section, and the third section are respectively open to inner spaces defined by the first section, the second section, and the third section. In a second configuration, the at least one opening in the second section is occluded to restrict communication with the inner space defined by the second section, while the openings in the first section and the third section remain open to the inner spaces defined by the first section and the third section, respectively.
- According to another embodiment, a method is provided for adjusting and positioning a femoral venous cannula in a patient for cardiopulmonary bypass during a cardiac procedure. The cannula has a first end, a second end, and a longitudinal axis extending between the first end and the second end, and includes a first section at the first end and including an outer wall and having at least one opening therethrough, a second section connected to the first section along the longitudinal axis and including an outer wall and having at least one opening therethrough, and a third section connected to the second section along the longitudinal axis on a side of the second section opposite the first section and including an outer wall and having at least one opening therethrough. In a first configuration, the openings in each of the first section, the second section, and the third section are respectively open to inner spaces defined by the first section, the second section, and the third section, while in a second configuration, the at least one opening in the second section is occluded to restrict communication with the inner space defined by the second section, while the openings in the first section and the third section remain open to the inner spaces defined by the first section and the third section, respectively. The method includes adjusting the cannula to one of the first configuration or the second configuration, inserting the cannula through the femoral vein of the patient and advancing the cannula towards the heart of the patient, and positioning the cannula at a first position in the patient wherein the at least one opening of the first section of the cannula is arranged in the superior vena cava, the at least one opening of the second section of the cannula is arranged in the right atrium, and the at least one opening of the third section of the cannula is arranged in the inferior vena cava.
- Embodiments of the invention therefore provide a femoral venous cannula device that is convertible between a multi-stage cannula and a bi-caval cannula for different surgical procedures.
- The foregoing and other features and advantages of the invention will become apparent from the following detailed description of embodiments, by means of the accompanying drawings. In the drawings:
-
FIG. 1 shows a multi-stage femoral venous cannula; -
FIG. 2 shows a bi-caval femoral venous cannula; -
FIG. 3 shows a femoral venous cannula that is positioned at a heart for a cardiopulmonary bypass procedure according to an embodiment of the invention; -
FIG. 4 shows a femoral venous cannula configured as a multi-stage cannula according to a first embodiment of the invention; -
FIG. 5 shows a cross-sectional view of the femoral venous cannula ofFIG. 4 , where the cross section includes a longitudinal axis of the cannula; -
FIGS. 6A and 6B show cross-sectional views of the femoral venous cannula ofFIG. 4 in a first position and a second position, respectively, the cross-section taken in a plane perpendicular to the longitudinal axis of the cannula; -
FIG. 7 shows an enlarged view of an end the femoral venous cannula ofFIG. 4 , where the cannula is configured as a bi-caval cannula; -
FIGS. 8A and 8B show an enlarged view of a femoral venous cannula according to a second embodiment of the invention, in a first position and a second position, respectively; -
FIGS. 9A and 9B show a multi-stage femoral venous cannula and a sleeve, respectively, according to a third embodiment of the invention; and -
FIG. 10 shows the cannula and the sleeve inFIGS. 8A and 8B in an assembled state. -
FIG. 3 shows a heart and a femoral venous cannula according to an embodiment of the invention. Theright atrium 110 of theheart 100 is connected to theinferior vena cava 111, which connects the veins located in the lower part of the patient's body to theheart 100, and thesuperior vena cava 112, which connects the veins located in the upper part of the patient's body to theheart 100. Deoxygenated blood generally empties from theinferior vena cava 111 and thesuperior vena cava 112 into theright atrium 110, to be oxygenated and recirculated through the body. - In
FIG. 3 , a femoralvenous cannula 1 according to an embodiment of the invention has been positioned through theinferior vena cava 111 and theright atrium 110, and protrudes into thesuperior vena cava 112. Thecannula 1 is positioned in this manner to drain the patient's body of deoxygenated blood, and to deliver the blood to, for example, a cardiopulmonary bypass pump or machine, for oxygenation and further processing, before being returned to the patient's body. - As can be seen in
FIGS. 3 and 4 , thecannula 1 according to an embodiment of the invention has afirst section 10 and asecond section 20. Each of the first andsecond sections sections sections section opening 11, and typically a plurality ofopenings 11. Theopenings 11 inFIGS. 3 and 4 are circular. Theopenings 11 in thefirst section 10 may be shaped and/or arranged substantially similarly to theopenings 11 in thesecond section 20. In some embodiments, theopenings 11 in thefirst section 10 may have different shapes and/or spacing than theopenings 11 in thesecond section 20, based on the particular clinical application and/or patient characteristics. A distal end of thefirst section 10 of thecannula 1 may be tapered or otherwise shaped to further ease insertion of thecannula 1 through the body. - In the embodiment of
FIGS. 3 and 4 , thesections third section 30, which include one ormore openings 31, and generally a plurality ofopenings 31. Theopenings 31 in the embodiment inFIGS. 3 and 4 are illustrated as being square or rectangular shaped to be more easily distinguishable from theopenings 11. However, in other embodiments, theopenings 31 may be the same shape (e.g., round, similar to howopenings 11 are illustrated in the figures), and have the same spacing, as theopenings 11 in eithersections section 30 may be configured similarly to thesections section 30 may also be substantially cylindrical, may be flexible, and/or may be wire-reinforced. In other embodiments, thesection 30 may be configured differently than thesections section 30 may be made of a semi-rigid material that is more rigid than a material used for thesections - The
sections elongated tubular section 40 that connects thecannula 1 to the outside of the patient, for example, first for facilitating insertion and positioning of thecannula 1, and later for connection to a cardiopulmonary bypass pump. - As can best be seen in
FIG. 3 , in a final position, thecannula 1 according to the first embodiment is positioned so that thefirst section 10 is located in or approximate thesuperior vena cava 112, thesecond section 20 is located in or approximate theinferior vena cava 111, and the centralthird section 30 is located in or approximate theright atrium 110 of theheart 100. Generally, a length of thecentral section 30 is sufficiently long to extend from theinferior vena cava 111 to thesuperior vena cava 112, so that theholes 11 insections right atrium 110. In some instances, different sized cannula with, for example, different widths orcentral sections 30 having different lengths, may be available for selection, depending on characteristics of the patient. Thecannula 1 can be inserted, for example, via the femoral vein near the thigh or groin of the patient, and advanced towards theheart 100 through theinferior vena cava 111. In other embodiments, it may be possible to insert thecannula 1 in the opposite direction via thesuperior vena cava 112, or from another access point. InFIG. 3 , thecannula 1 is configured as a multi-stage cannula, where the holes oropenings sections FIGS. 3 and 4 may be used, for example, during aortic or mitral valve replacement or repair procedures. - Meanwhile, embodiments of the invention provide a convertible cannula, where the
central section 30 of thecannula 1 can be adjusted so that theopenings 31 are sealed shut instead of kept open, to effectively convert thecannula 1 from a multi-stage cannula to a bi-caval cannula, so that thesame cannula 1 can be used for different cardiac surgeries and procedures which require either type of cannulation. - In the embodiment of
FIGS. 3 and 4 ,section 30 ofcannula 1 includes a shutter system. Referring to the cross-sections inFIGS. 5, 6A, and 6B (whereFIGS. 6A and 6B shows cross-sections ofsection 30 ofcannula 1 in different positions or configurations, described in greater detail below), at thesection 30, thecannula 1 may include anouter wall 32 and aninner wall 34, where theinner wall 34 defines aninner lumen 12, and where a separate space is formed between theinner wall 34 and theouter wall 32. Theinner lumen 12 may connect to thesection 10 at the distal end of thecannula 1, for example, for facilitating drainage from theopenings 11 insection 10. Theouter wall 32 defines theopenings 31, which extend through theouter wall 32 into a space between theinner wall 34 and theouter wall 32, to facilitate drainage by thecannula 1 through theopenings 31. In some embodiments, theinner lumen 12 may also communicate with the space between theinner wall 34 and theouter wall 32, or theinner wall 34 may be omitted, so that theopenings cannula 1. The shutter system further includes at least one slidingwall 33 positioned along an inner surface of theouter wall 32. The slidingwall 33 may include a plurality of longitudinal strips that extend along a length of thesection 30 between thesections wall 33 may be a substantially cylindrical wall that is slightly smaller in diameter or width than theouter wall 32, and that includes openings that are either substantially the same size or larger than theopenings 31. - In a first position, as illustrated in
FIGS. 5 and 6A , the slidingwall 33 is positioned so that the openings in the slidingwall 33 are aligned with theopenings 31 in theouter wall 32, so that the slidingwall 33 does not block theopenings 31 or obstruct access into the space between theinner wall 34 and theouter wall 32. In a second position, as illustrated inFIGS. 6B and 7 , the slidingwall 33 can be rotated relative to theouter wall 32 ofsection 30 so that the slidingwall 33 occludes or blocks theopenings 31, and thus blocks access into thecannula 1 from theopenings 31, while theopenings 11 ofcannula 1 remain open. Therefore, in the configuration shown inFIG. 7 , thecannula 1 has been converted to function as a bi-caval cannula, where drainage occurs at the inferior and superior venae cavae 111, 112 throughsections right atrium 110, since theopenings 31 are now blocked. The bi-caval cannula configuration illustrated inFIG. 7 may be used, for example, during procedures where access to the right chambers of the heart are required, such as during tricuspid repair or replacement, and/or where drainage at theright atrium 110 may not be needed or desired, or may hinder or obstruct the particular procedure. - In the manner described above, the internal sliding
wall 33 slides over theholes 31 insection 30, effectively opening and closing theholes 31 based on the requirements of the particular procedure. In one embodiment, the shutter system inFIGS. 3-7 may be remotely activated, for example, through an electronic switch system that can be actuated from outside the patient's body. In another embodiment, the slidingwall 33 may be mechanically rotated, for example, via a lever or similar mechanism at or near thesection 30 of the cannula, or for example, a similar mechanism that connects to the outside of the patient's body through thetubular section 40. - In a second embodiment, illustrated in
FIGS. 8A and 8B , acentral section 30′ of a cannula may instead include one or more slidingwalls 35 that move laterally or longitudinally along the length of the cannula, rather than rotate relative to the rest of the cannula. The slidingwall 35 inFIGS. 8A and 8B may include, for example, a series of ring-shaped strips that are slightly smaller in diameter or width than theouter wall 32, or may include one substantially cylindrical wall that has openings substantially the same size or larger than theopenings 31. As discussed above, actuation of the slidingwall 35 moves thewall 35 longitudinally, either towards thesection 10 or towards thesection 20, so that the slidingwall 35 occludes theopenings 31, as can be best seen inFIG. 8B . The other portions of the cannula inFIGS. 8A and 8B may be similar to those discussed with respect toFIGS. 3-7 . - Various modifications can also be made to the embodiments of the femoral
venous cannula 1 inFIGS. 3-7 and inFIGS. 8A-8B . For example, in the embodiments discussed above, the slidingshutter walls outer wall 32. However, in some embodiments, the slidingwalls section 30. Furthermore, thesections shutter wall sections sections shutter wall sections - A third embodiment of the invention is illustrated in
FIGS. 9A, 9B, and 10 . In the third embodiment of the invention, a kit including acannula 2 and an elastic tube or coveringsheath 3 are provided. Thecannula 2 can be, for example, a general multi-stage femoral venous cannula, such as the multi-stage cannula illustrated inFIG. 1 . The cannula can include a plurality of holes oropenings 11 along the length of thecannula 2, which are spaced apart and extend sufficiently along a length of thecannula 2 for theopenings 11 to be positionable in theright atrium 110, theinferior vena cava 111, and thesuperior vena cava 112 of a patient simultaneously. - The elastic sheath or
tube 3 is generally constructed of a material so as to be impermeable to blood. Furthermore, thetube 3 may include, for example, an adhesive 4 that is applied along the ends of the tube 3 (as illustrated), or alternatively, along an entire inner surface of thetube 3. The adhesive 4 provided will generally be strong enough to allow thetube 3 to permanently adhere to thecannula 2. The adhesive may initially be rolled out or covered, and then uncovered or rolled down once thetube 3 is arranged at a desired position relative to thecannula 2. Other variants of the adhesive type and/or application with respect to the surfaces of thetube 3 can also be used. For example, thetube 3 can adhere to the cannula through adhesives as discussed, or for example, via elastic properties or an interference fit. In some embodiments, a shrink wrap or similar material may be utilized for covering the desiredopenings 11 incannula 2. - In operation, for example, after a procedure where a multi-stage cannula is utilized has been completed, a surgeon or other practitioner can attach the
tube 3 over thecannula 2 through, for example, a puncture or access site through the heart wall, or alternatively,tube 3 can be attached upon removal of thecannula 2 from the patient's body. The adhesive or other adhering means will hold thetube 3 in position on thecannula 2, generally to cover thecentral openings 11 corresponding to the position of the right atrium, so that the modifiedcannula 2 can function as a bi-caval cannula during a subsequent procedure. - In the embodiment of
FIGS. 9A-10 , the elastic sheath ortube 3 can be applied to currently existing multi-stage femoral venous cannula, and so additional cannulae according to the invention may not need to be provided. By covering theopenings 11 along a central portion of thecannula 2, thecannula 2 can be converted from a multi-stage cannula to a bi-caval cannula, so long asopenings 11 remain uncovered at both a distal end and a proximal end relative to the positioning of thetube 3. Thekit including cannula 2 andtube 3 may also be advantageous in that tubing of different sizes, lengths, and/or configurations can be provided, to provide a simple customizable cannula based on the particular patient's anatomy. - The parts of the
cannulae - Each of the embodiments discussed above provides a single cannula that can be converted from a multi-stage cannula to a bi-caval cannula on demand, where a physician or other practitioner can close different holes along the cannula to adjust the hole configurations of the cannula to suit the particular clinical application. In some embodiments, the cannula can further be converted from a bi-caval cannula to a multi-stage cannula as well, for example, by opening different holes, adding more flexibility for the physician.
- Embodiments of the invention would provide a cannula that would allow for customization of hole configurations, which could potentially reduce the number of products or product codes to stock. For example, cannulae according to embodiments of the invention could replace both multi-stage cannula and bi-caval cannula, so that only a single type of cannulae can be stocked to cover both types of applications. Embodiments of the invention would also allow more flexibility with respect to customization based on surgeon preference and patient anatomy, for example, different heart and/or vein sizes.
- In addition, embodiments of the invention provide a more flexible cannula that can be adjusted mid-procedure. Previously, in instances where one of a multi-stage cannula or a bi-caval cannula is required for a first procedure, and then the other of the multi-stage cannula or the bi-caval cannula is required for a second procedure, upon completion of the first procedure, the first cannula had to be removed and the second cannula then inserted and repositioned before the second procedure could be performed. With embodiments of the invention, a single cannula can be positioned for the first procedure, and for example, adjusted to first serve as a multi-stage cannula, and can then be converted for the second procedure, for example, to serve as a bi-caval cannula, while still correctly positioned relative to the heart, so that removal and repositioning of the cannula is no longer required, thereby reducing surgical times and simplifying the surgical process. In addition, for example, with the third embodiment discussed above, a conventional multi-stage cannula can still be used for a first procedure, and tubing of different lengths can be provided, where an appropriate sealing tube can potentially be selected or cut mid-procedure, and then applied to the cannula, to seal the desired number of openings on the cannula based on the patient's anatomy, thereby providing a more customizable and effective bi-caval cannula.
- For purposes of this description, certain aspects, advantages, and novel features of the embodiments of this disclosure are described herein. The disclosed methods, apparatuses, and systems should not be construed as limiting in any way. Instead, the present disclosure is directed toward all novel and nonobvious features and aspects of the various disclosed embodiments, alone and in various combinations and sub-combinations with one another. The methods, apparatuses, and systems are not limited to any specific aspect or feature or combination thereof, nor do the disclosed embodiments require that any one or more specific advantages be present or problems be solved.
- Although the operations of some of the disclosed embodiments are described in a particular, sequential order for convenient presentation, it should be understood that this manner of description encompasses rearrangement, unless a particular ordering is required by specific language. For example, operations described sequentially can in some cases be rearranged or performed concurrently. Moreover, for the sake of simplicity, the attached figures may not show the various ways in which the disclosed methods can be used in conjunction with other methods. Additionally, the description sometimes uses terms like “provide” or “achieve” to describe the disclosed methods. These terms are high-level abstractions of the actual operations that are performed. The actual operations that correspond to these terms can vary depending on the particular implementation and are readily discernible by one of ordinary skill in the art.
- In view of the many possible embodiments to which the principles of the disclosure can be applied, it should be recognized that the illustrated embodiments are only preferred examples of the invention and should not be taken as limiting the scope of the disclosure. Rather, the scope of the disclosure is defined by the following claims.
Claims (18)
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US6508777B1 (en) * | 1998-05-08 | 2003-01-21 | Cardeon Corporation | Circulatory support system and method of use for isolated segmental perfusion |
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US6186981B1 (en) * | 1999-03-23 | 2001-02-13 | Peter Cho | Cavo-atrial cannula |
AU784413B2 (en) * | 1999-11-11 | 2006-03-30 | Edwards Lifesciences Corporation | Venous return cannula with enhanced drainage |
US6682499B2 (en) * | 2001-06-28 | 2004-01-27 | Jay Alan Lenker | Method and apparatus for venous drainage and retrograde coronary perfusion |
CN2624935Y (en) * | 2003-06-04 | 2004-07-14 | 胡晓旻 | Medical venous cannula |
US9192755B2 (en) * | 2005-11-10 | 2015-11-24 | Phase One Medical, Llc | Catheter device |
CN105709323A (en) * | 2008-07-09 | 2016-06-29 | 科拉弗洛有限公司 | Methods, Apparatuses And Systems For Caval Stenting For Venous Drainage |
US8562519B2 (en) * | 2009-12-31 | 2013-10-22 | Cardiacassist, Inc. | Pumping system and method for assisting a patient's heart |
EP2707052B1 (en) * | 2011-05-13 | 2021-10-06 | Mayo Foundation For Medical Education And Research | Cannula apparatus and ventricular assist systems using the cannula apparatus |
SG11201500818TA (en) * | 2012-08-03 | 2015-03-30 | Singapore Health Serv Pte Ltd | Arterial cannula which allows perfusion along opposing directions within a cannulated vessel |
US10286126B2 (en) * | 2012-11-06 | 2019-05-14 | University of Pittsburgh—of the Commonwealth System of Higher Education | Adjustable liposuction cannula |
US20170232238A1 (en) * | 2014-08-06 | 2017-08-17 | Edwars Litesciences Corporation | Multi-lumen cannulae |
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US11607481B2 (en) * | 2019-12-11 | 2023-03-21 | Po-Yen Lin | Bidirectional vascular cannula device |
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