CN117122404A - Sacculus electrode assembly and pulse electric field ablation catheter - Google Patents
Sacculus electrode assembly and pulse electric field ablation catheter Download PDFInfo
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- CN117122404A CN117122404A CN202311274914.2A CN202311274914A CN117122404A CN 117122404 A CN117122404 A CN 117122404A CN 202311274914 A CN202311274914 A CN 202311274914A CN 117122404 A CN117122404 A CN 117122404A
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- 238000002679 ablation Methods 0.000 title claims abstract description 60
- 230000005684 electric field Effects 0.000 title claims abstract description 23
- 239000002775 capsule Substances 0.000 claims abstract description 20
- 230000000712 assembly Effects 0.000 abstract description 3
- 238000000429 assembly Methods 0.000 abstract description 3
- 210000001519 tissue Anatomy 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 210000003492 pulmonary vein Anatomy 0.000 description 6
- 235000021251 pulses Nutrition 0.000 description 5
- 238000007674 radiofrequency ablation Methods 0.000 description 4
- 206010003658 Atrial Fibrillation Diseases 0.000 description 3
- 206010003119 arrhythmia Diseases 0.000 description 3
- 230000006793 arrhythmia Effects 0.000 description 3
- 238000004520 electroporation Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000036544 posture Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013153 catheter ablation Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000619 316 stainless steel Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 229910000566 Platinum-iridium alloy Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000030833 cell death Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 210000005003 heart tissue Anatomy 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000003902 lesion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000017074 necrotic cell death Effects 0.000 description 1
- HWLDNSXPUQTBOD-UHFFFAOYSA-N platinum-iridium alloy Chemical class [Ir].[Pt] HWLDNSXPUQTBOD-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
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- 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
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
-
- 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
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
-
- 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
- A61B2018/00214—Expandable means emitting energy, e.g. by elements carried thereon
- A61B2018/0022—Balloons
-
- 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
- A61B2018/00315—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for treatment of particular body parts
- A61B2018/00345—Vascular system
-
- 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
- A61B2018/00571—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body for achieving a particular surgical effect
- A61B2018/00577—Ablation
-
- 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
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/14—Probes or electrodes therefor
- A61B2018/1405—Electrodes having a specific shape
- A61B2018/1417—Ball
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- Health & Medical Sciences (AREA)
- Surgery (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biomedical Technology (AREA)
- Otolaryngology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Plasma & Fusion (AREA)
- Physics & Mathematics (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Surgical Instruments (AREA)
Abstract
The present application relates to balloon catheters, and in particular to electrode assemblies for balloon catheters. A balloon electrode assembly comprising: a balloon, the balloon being expandable and collapsible, the balloon having a proximal end and a distal end; the electrode plate is fixed on the capsule body and is used for generating a pulse electric field; the electrode plates comprise at least one first electrode plate and at least one second electrode plate, the first electrode plate is biased to the proximal side of the capsule body, and the second electrode plate is biased to the distal side of the capsule body; the first electrode plate and the second electrode plate are staggered along the circumferential direction, and the circumferential direction is the direction around the connecting line of the proximal end and the distal end of the capsule body. The balloon electrode assembly mainly solves the problem of improving the ablation efficiency of the ablation catheter.
Description
Technical Field
The present application relates to balloon catheters, and in particular to electrode assemblies for balloon catheters.
Background
Catheter ablation technology is a common arrhythmia treatment means, and can make tissue necrosis through focal ablation, so as to eliminate abnormal discharge of focal tissue. Catheter ablation modes include radio frequency ablation and pulsed electric field ablation.
Atrial fibrillation is one type of arrhythmia and its current treatment technology is to isolate the pulmonary veins in a point-to-point fashion using pressure monitoring ablation catheters. The head end of a radio frequency ablation catheter on the market is a simple metal head electrode with the length of 3.5-4.0mm and the diameter of 2.33-2.83mm, and the volume of the head end electrode is smaller, so that a lesion is smaller, and the ablation range (surface size) of each point is 2-4mm. Moreover, based on the principle of radio frequency ablation, the ablation purpose is realized by means of heat conduction, and the ablation depth is limited. With the size of an ablation stove in the prior art, about 30 points are needed for isolating a single-side pulmonary vein, 30 minutes are generally needed for completing the isolation of the single-side pulmonary vein, and the operation efficiency is low.
Pulsed electric field ablation (PFA) is a new technique for current atrial fibrillation treatment, and refers to a method that uses a strong electric field to cause cell electroporation (irreversible electroporation) in a short time, and the electroporation results in cell death, which has been successfully used as a new method for non-thermal ablation of cardiac tissue with arrhythmia. At present, research on pulsed electric field ablation is mainly focused on the 'one-shot' design direction, namely, annular damage is formed at one time so as to realize rapid isolation of pulmonary veins. However, the focal point of the pulmonary vein causing atrial fibrillation is complex and various, or is left side common dry, or is a plurality of small opening branches, the one-shot type catheter cannot well realize ablation isolation at the anatomical variant pulmonary vein, and point-to-point ablation is a better solution for such cases.
If the point-to-point ablation depth and the ablation range can be realized to be larger, the operation time can be greatly shortened, and the operation efficiency can be improved.
Disclosure of Invention
The application provides a balloon electrode assembly and a balloon catheter, which mainly solve the problem of improving the ablation efficiency of an ablation catheter.
In a first aspect, the present application provides a balloon electrode assembly.
A balloon electrode assembly comprising:
a balloon, the balloon being expandable and collapsible, the balloon having a proximal end and a distal end;
the electrode plate is fixed on the capsule body and is used for generating a pulse electric field;
the electrode plates comprise at least one first electrode plate and at least one second electrode plate, the first electrode plate is biased to the proximal side of the capsule body, and the second electrode plate is biased to the distal side of the capsule body;
the first electrode plate and the second electrode plate are staggered along the circumferential direction, and the circumferential direction is the direction around the connecting line of the proximal end and the distal end of the capsule body.
In one aspect, the balloon has an equatorial position of maximum radial dimension in the inflated condition, the side of the first electrode tab adjacent the distal end not exceeding the equatorial position;
and/or the side of the second electrode sheet near the proximal end does not exceed the equatorial position.
In one aspect, the width dimension of the first electrode tab has an increasing feature along the proximal end to the distal end and/or the width dimension of the second electrode tab has an increasing feature along the distal end to the proximal end.
In one technical scheme, the edge of the end, away from the proximal end, of the first electrode plate is in a circular arc shape, and/or the edge of the end, away from the distal end, of the second electrode plate is in a circular arc shape.
In one technical scheme, the first electrode plate and the second electrode plate are provided with at least two; and in the circumferential direction, one second electrode plate is arranged between two adjacent first electrode plates, and one first electrode plate is arranged between two adjacent second electrode plates.
In one technical scheme, the balloon electrode assembly comprises a first stitch and a second stitch, wherein the first stitch is connected with the first electrode slice, the second stitch is connected with the second electrode slice, and at least a part of the second stitch is parallel to the first electrode slice along the circumferential direction.
In one technical scheme, the distal end of the capsule body does not protrude from the sphere corresponding to the capsule body.
In one aspect, the electrode pad includes a distal electrode disposed at a distal end of the balloon.
In one technical scheme, the distal end of the capsule body is provided with a concave structure, and the distal electrode is arranged in the concave structure.
In a second aspect, the present application provides a pulsed electric field ablation catheter.
A pulsed electric field ablation catheter comprising:
a tube body;
and a balloon electrode assembly connected to the distal end of the tube;
the balloon electrode assembly is the balloon electrode assembly according to any one of the technical schemes.
The application has the beneficial effects that:
according to the balloon electrode assembly, the electrode on the surface of the balloon body is configured to comprise the first electrode plate biased at the proximal end side and the second electrode plate biased at the distal end side, and the first electrode plate and the second electrode plate are biased along the axial direction of the balloon body and are arranged in a circumferential intersecting manner, so that when ablation is carried out, according to different postures of the balloon electrode assembly, the first electrode plate and the second electrode plate can be independently ablated, and when the equatorial position of the balloon electrode assembly is attached to target tissue, the first electrode plate and the second electrode plate can be simultaneously ablated, so that a larger ablation range is obtained. The method is matched with a pulse electric field ablation mode with larger ablation depth, so that a larger ablation range can be obtained, and the surgical efficiency is improved.
Drawings
FIG. 1 is a schematic illustration of a point-to-point ablation procedure on a heart using an ablation catheter;
FIG. 2 is a perspective view of one embodiment of a balloon electrode assembly of the present application;
FIG. 3 is an orthographic view of the balloon electrode assembly of FIG. 2 as seen from a distal end;
FIG. 4 is an orthographic view of the balloon electrode assembly of FIG. 2 as seen from a proximal end;
FIG. 5 is an orthographic view of the balloon electrode assembly of FIG. 2, as viewed in a direction perpendicular to the axial direction;
list of feature names corresponding to reference numerals in the figure:
10. a bladder; 11. a proximal end; 12. a distal end; 13. an equatorial position; 14. a concave structure;
20. an insulating base; 21. a first electrode sheet; 22. a second electrode sheet;
31. a first trace; 32. a second trace;
40. a distal electrode;
50. a tube body;
60. a heart; 61. and (5) an ablation stove.
Detailed Description
The application will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, related operations of the present application have not been shown or described in the specification in order to avoid obscuring the core portions of the present application, and may be unnecessary to persons skilled in the art from a detailed description of the related operations, which may be presented in the description and general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated.
Hereinafter, the terms "proximal" and "distal" are used in the medical arts to refer to the proximal end, i.e., the end proximal to the instrument operator, and the distal end, i.e., the end distal to the instrument operator, for the instrument to be manipulated. For example, for an ablation catheter, a balloon electrode assembly is attached to the distal end of the body of the ablation catheter.
The technical solution of the present application can be used for a wide range of focal ablation catheters, such as fig. 1, capable of performing point-to-point ablation of a focal area of a heart 60 to form an ablation focal 61. The balloon electrode assembly of the focal ablation catheter adopts a form that electrode plates are distributed at the proximal end 11 and the distal end 12 simultaneously, and a first electrode plate 21 of the proximal end 11 and a second electrode plate 22 of the distal end 12 are staggered along the circumferential direction of the balloon electrode assembly. When the balloon electrode assembly works, the first electrode plate 21 and the second electrode plate 22 can be respectively and independently contacted with tissue to be ablated, and when the equatorial position 13 of the balloon electrode is abutted against the tissue, the first electrode plate 21 and the second electrode plate 22 can also be simultaneously contacted with the tissue to be ablated, so that a larger ablation range (surface size) is formed; meanwhile, pulse electric field ablation can be performed by means of the electrode plate, so that a larger ablation depth is formed.
Examples of balloon electrode assemblies in the present application:
referring to fig. 1, in one embodiment, the balloon electrode assembly may be used to perform point-to-point ablation and is pulsed electric field ablation. Please refer to fig. 2 to 5, which include: a balloon 10, the balloon 10 being expandable and collapsible, the balloon 10 having a proximal end 11 and a distal end 12; and an electrode sheet fixed on the capsule body 10 for generating a pulsed electric field; the electrode plates comprise at least one first electrode plate 21 and at least one second electrode plate 22, wherein the first electrode plate 21 is biased to the proximal side of the capsule body 10, and the second electrode plate 22 is biased to the distal side of the capsule body 10; the first electrode sheet and the second electrode sheet are staggered along the circumferential direction of the capsule body 10, and the circumferential direction of the capsule body 10 is the direction around the connecting line of the proximal end 11 and the distal end 12.
The balloon 10 of the balloon electrode assembly may be inflated with a gas or inflated with a liquid, and is not limited in this application. Moreover, the manner in which the balloon 10 is inflated and collapsed may be in a conventional manner, such as by delivering a gas or liquid through corresponding passages in the tube 50, and will not be described in detail herein. The inflated shape of the balloon 10 may be a standard sphere, or may be a sphere similar to another sphere, such as an ellipsoid.
Unlike the heat conduction mode of radio frequency ablation, the energy relied on by pulsed electric field ablation is pulsed electric field, and the electrode plate fixed on the surface of the balloon body 10 of the balloon electrode assembly is used for realizing the generation of electric field. The electrode pads may be mounted on an insulating substrate 20 to form a flexible circuit and then secured to the bladder 10. For the purpose of leading out the electrical circuit of the electrode pads, a metal conductor for conducting electrical energy may be contained in the flexible circuit, which forms a trace with the corresponding insulating matrix. In one embodiment, the balloon 10 of the balloon electrode assembly is a small balloon with a diameter of 12mm, and 6 bean sprout-shaped flexible circuits are attached to the surface of the balloon 10.
For the purpose of the present application, please refer to fig. 2 and 5, the first electrode pad 21 is biased to the proximal side of the balloon 10, and the second electrode pad 22 is biased to the distal side of the balloon 10. The above expression of being offset to the proximal end side is not intended to limit that the corresponding electrode sheet is located entirely within the hemispherical range of the balloon 10 near the proximal end 11, for example, the corresponding electrode sheet may be located partially within the hemispherical range of the balloon 10 near the proximal end 11 and partially within the hemispherical range of the balloon 10 near the distal end 12, but the overall position of the electrode sheet is biased toward the hemispherical dividing line of the balloon 10 as a whole. The expression offset to the distal side has a similar description and will not be specifically expanded here.
The above hemispherical dividing line may be regarded as the equatorial position 13 of the balloon 10, i.e. the position of the balloon 10 having the largest radial dimension in the inflated state, which circumferentially surrounds the balloon 10 for one revolution. In one embodiment, referring to fig. 2 and 5, the side of the first electrode sheet 21 near the distal end 12 does not exceed the equatorial position 13 and the side of the second electrode sheet 22 near the proximal end 11 does not exceed the equatorial position 13. In summary, in one embodiment, there is no overlap of the first electrode pad 21 and the second electrode pad 22 in the axial direction of the balloon 10. The above structure can ensure that when the balloon 10 is ablated in a posture of being axially inclined to the surface of the tissue to be ablated, the first electrode sheet 21 or the second electrode sheet 22 close to one side of the tissue has a larger ablation range, and a larger ablation surface area is realized. Of course, in other embodiments, the first electrode sheet 21 and the second electrode sheet 22 may have overlapping portions along the axial direction of the balloon 10 in the circumferential direction of the balloon 10. For example, the side of the first electrode sheet 21 near the distal end 12 passes over the equatorial position 13, the side of the second electrode sheet 22 near the proximal end 11 is flush with the equatorial position 13 or is spaced from the equatorial position 13, and for example, the side of the first electrode sheet 21 near the distal end 12 is flush with the equatorial position 13 or is spaced from the equatorial position 13, and the side of the second electrode sheet 22 near the proximal end 11 passes over the equatorial position 13.
To further expand the ablation range, the width dimension of the first electrode sheet 21 has an increasing feature along the proximal end 11 toward the distal end 12 and the width dimension of the second electrode sheet 22 has an increasing feature along the distal end 12 toward the proximal end 11. The enlarged feature here does not mean that the first electrode sheet 21 as a whole necessarily exhibits a small end and a large end and gradually changes between both ends, but may also exhibit a change in width dimension only in a partial region. Referring to fig. 2, in one embodiment, the edge of the end of the first electrode sheet 21 away from the proximal end 11 and the edge of the end near the proximal end 11 are circular arcs, and the edge of the end of the second electrode sheet 22 away from the distal end 12 and the edge of the end near the distal end 12 are circular arcs. Meanwhile, the arc edges at the two ends of the first electrode sheet 21 and the second electrode sheet 22 are inclined straight edges, and the width dimension is gradually changed. The above-described width dimension variation is advantageous for electric field distribution, and also for achieving a larger ablation range.
In one embodiment, the first electrode tab 21 and the second electrode tab 22 are each provided with at least two; in the circumferential direction, a second electrode plate 22 is provided between two adjacent first electrode plates 21, and a first electrode plate 21 is provided between two adjacent second electrode plates 22. The first electrode sheet 21 and the second electrode sheet 22 described above form a cross arrangement structure. Referring to fig. 3 and 4, in one embodiment, the first electrode pad 21 and the second electrode pad 22 are each provided with three. The number of electrode pads may be determined according to the diameter of the balloon 10, the ablation requirement, the area of each electrode pad, and the like. The first electrode sheet 21 may have the same shape as the second electrode sheet 22, as shown in fig. 2 to 5, or may have a different shape from the second electrode sheet 22. In addition, at least two first electrode sheets 21 may have different shapes, and/or at least two second electrode sheets 22 may have different shapes.
Based on the cross arrangement of the first electrode sheet 21 and the second electrode sheet 22, in one embodiment, the balloon electrode assembly includes a first trace 31 and a second trace 32, the first trace 31 being connected with the first electrode sheet 21, the second trace 32 being connected with the second electrode sheet 22, at least a portion of the second trace 32 being circumferentially side-by-side with the first electrode sheet 21. The above-described arrangement of the traces facilitates the power delivery of the second electrode pad 22, and is aesthetically pleasing. Preferably, the first trace 31 and the first electrode sheet 21 may be arranged in a pair, and the second trace 32 and the second electrode sheet 22 may be arranged in a pair. The proximal end of the trace may be routed by a guide wire to the handle of the ablation catheter via the body 50 of the ablation catheter.
When the balloon electrode assembly is used for ablation operation, if the long axis of the ablation catheter is taken as the axial direction and the surface of the tissue to be ablated is taken as an ideal plane, the mode of the balloon electrode assembly of the ablation catheter, which is attached to the tissue, can be simplified into 3 modes, namely, the axial direction is perpendicular to the plane, the axial direction is inclined to the plane and the axial direction is parallel to the plane. In a typical embodiment, the axial direction may be at 90 °,45 °, and 0 ° to the plane, respectively. In order to enable the electrode pad to contact the tissue as much as possible in different modes, in one embodiment, the distal end 12 of the balloon 10 does not protrude beyond the sphere to which the balloon 10 corresponds, i.e., the distal end 12 of the balloon 10 is not provided with a structure protruding beyond its smooth contour, so that the problem of the protrusion of the distal end 12 of the balloon 10 affecting the posture of the balloon electrode assembly does not occur.
In one embodiment, to achieve more ablative functionality, the electrode pad includes a distal electrode 40 disposed at the distal end 12 of the balloon 10. The distal electrode 40 forms a distal cap that closes an opening formed in the distal end 12 after the balloon 10 is formed. The distal cap may be formed of a metal electrode, forming the distal electrode 40, and may be electrically connected by a separate lead that may pass through the interior of the balloon 10. Specifically, the distal electrode 40 may be 316 stainless steel or platinum iridium alloy. Of course, in other embodiments, the distal end 12 of the balloon 10 may be provided as an insulating structure, such as an epoxy seal or other plastic injection molding seal.
In order to avoid the distal electrode 40 forming a convex structure at the distal end 12 of the balloon 10, further, in one embodiment, referring to fig. 3, the distal end 12 of the balloon 10 is provided with a concave structure 14, and the distal electrode 40 is disposed in the concave structure 14.
The balloon electrode assembly is operatively connected to the distal end 12 of the catheter for insertion into the living being through the sheath with the catheter. For a focus needing ablation, the gesture of the balloon electrode assembly can be adjusted by controlling the bending of the catheter, so that the balloon electrode assembly is abutted against tissues at different angles, and then pulse electric field ablation is carried out by means of corresponding electrode plates. Because the balloon electrode assembly of the application can realize a larger ablation range and ablation depth, the number of the ablation foci 61 on the heart 60 is reduced, thereby being beneficial to improving the operation efficiency, reducing the pain of patients and reducing the operation strength of doctors.
Embodiments of pulsed electric field ablation catheters in the present application:
a pulsed electric field ablation catheter comprising:
a tube body 50;
and a balloon electrode assembly connected to the distal end 12 of the tube 50;
the structure of the balloon electrode assembly is the same as that of the balloon electrode assembly in the above embodiment of the balloon electrode assembly, and will not be described here again.
The foregoing description of the application has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the application pertains, based on the idea of the application.
Claims (10)
1. A balloon electrode assembly, comprising:
a balloon, the balloon being expandable and collapsible, the balloon having a proximal end and a distal end;
the electrode plate is fixed on the capsule body and is used for generating a pulse electric field;
the electrode plates comprise at least one first electrode plate and at least one second electrode plate, the first electrode plate is biased to the proximal side of the capsule body, and the second electrode plate is biased to the distal side of the capsule body;
the first electrode plate and the second electrode plate are staggered along the circumferential direction, and the circumferential direction is the direction around the connecting line of the proximal end and the distal end of the capsule body.
2. The balloon electrode assembly of claim 1 wherein said balloon body has an equatorial position of maximum radial dimension in the inflated condition, said equatorial position being not exceeded on a side of said first electrode tab adjacent said distal end;
and/or the side of the second electrode sheet near the proximal end does not exceed the equatorial position.
3. The balloon electrode assembly of claim 1 wherein a width dimension of said first electrode sheet has an increasing feature distally along said proximal end and/or a width dimension of said second electrode sheet has an increasing feature proximally along said distal end.
4. A balloon electrode assembly according to any of claims 1-3, wherein an edge of an end of the first electrode sheet remote from the proximal end is rounded and/or an edge of an end of the second electrode sheet remote from the distal end is rounded.
5. The balloon electrode assembly of any one of claims 1-3 wherein said first electrode sheet and second electrode sheet are each provided with at least two; and in the circumferential direction, one second electrode plate is arranged between two adjacent first electrode plates, and one first electrode plate is arranged between two adjacent second electrode plates.
6. The balloon electrode assembly of any of claims 1-3 wherein the balloon electrode assembly comprises a first trace connected with the first electrode sheet and a second trace connected with the second electrode sheet, at least a portion of the second trace being side-by-side with the first electrode sheet in the circumferential direction.
7. The balloon electrode assembly of any of claims 1-3 wherein the distal end of the balloon does not protrude from the sphere to which the balloon corresponds.
8. The balloon electrode assembly of claim 7 wherein said electrode pad comprises a distal electrode disposed at a distal end of said balloon.
9. The balloon electrode assembly of claim 8 wherein a distal end of said balloon body is provided with a concave structure, said distal electrode being disposed within said concave structure.
10. A pulsed electric field ablation catheter, comprising:
a tube body;
and a balloon electrode assembly connected to the distal end of the tube;
the balloon electrode assembly is the balloon electrode assembly of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311274914.2A CN117122404A (en) | 2023-09-28 | 2023-09-28 | Sacculus electrode assembly and pulse electric field ablation catheter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311274914.2A CN117122404A (en) | 2023-09-28 | 2023-09-28 | Sacculus electrode assembly and pulse electric field ablation catheter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117122404A true CN117122404A (en) | 2023-11-28 |
Family
ID=88851000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311274914.2A Pending CN117122404A (en) | 2023-09-28 | 2023-09-28 | Sacculus electrode assembly and pulse electric field ablation catheter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117122404A (en) |
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2023
- 2023-09-28 CN CN202311274914.2A patent/CN117122404A/en active Pending
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