Pulse ablation catheter and ablation system

Abstract

The invention provides a pulse ablation catheter and an ablation system.The pulse ablation catheter comprises a handle and a catheter assembly; the catheter assembly comprises an outer tube, an inner tube and a spline, wherein the spline comprises a plurality of spokes and a first electrode; the far end of the outer pipe is provided with a plane A perpendicular to the axis of the outer pipe, in the third state, each spoke has a projection B on the outer side part of the outer pipe of the plane A, the projection B forms a projection plane C in a surrounding mode, and the projection planes C of every two adjacent spokes have a coincident plane D; and the area ratio of the overlapping surface D to the projective plane C of any one of the two adjacent spokes is greater than or equal to 5% and less than or equal to 40%. The pulse ablation catheter is switched among the three states so as to be suitable for conducting pulse ablation on the interior of the pulmonary vein and the mouth of the pulmonary vein. And more first electrodes can be arranged on the small and compact spline, so that more accurate ablation treatment can be carried out on a specific affected part, the treatment risk is reduced, and the treatment effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular, to a pulsed ablation catheter and an ablation system. Background Art

[0002] Atrial fibrillation is one of the most common arrhythmia conditions, and its symptoms are manifested as irregular heartbeats. Clinical studies at home and abroad have proved that pulmonary vein electrical isolation using pulsed electric field ablation (PFA) can effectively prevent the recurrence of atrial fibrillation.

[0003] The pulsed electric field ablation (PFA) surgery is a new method for treating atrial fibrillation. This surgery uses the irreversible electroporation mechanism to utilize pulsed electric fields with high voltage and short duration to cause tissue damage. Currently, the ablation catheter for pulsed electric field ablation exposes the metal electrodes outside the ablation catheter, applies pulsed high voltage to discharge between different metal electrodes, and the metal electrodes are in contact with the myocardial tissue. The high voltage generated during the discharge process destroys the myocardial tissue to achieve the ablation effect.

[0004] Most current mainstream manufacturers use circular catheters. The number of metal electrodes of this circular catheter is small, and the supportability is poor. When using the pulsed ablation technology to treat paroxysmal atrial fibrillation, it will affect the ablation area of the metal electrodes, as well as the contact reliability and uniformity of the electrodes, resulting in low efficiency and poor stability of catheter ablation, and increasing the ablation operation time. Summary of the Invention

[0005] To solve the problems in the prior art, the present application provides a pulsed ablation catheter and an ablation system including the pulsed ablation catheter. The technical solution of the present application is as follows:

[0006] A pulsed ablation catheter includes:

[0007] A handle;

[0008] A catheter assembly disposed at the distal end of the handle;

[0009] Characterized in that

[0010] The catheter assembly includes:

[0011] An outer tube;

[0012] An inner tube disposed inside the outer tube along the length direction of the outer tube and capable of moving along the length direction of the outer tube, and the distal end of the inner tube can protrude from the distal end of the outer tube;

[0013] Splines, the splines comprising: a plurality of spokes, a distal end of each spoke being disposed at a distal end of the inner tube, and a proximal end of each spoke being disposed at a distal end of the outer tube; a first electrode, a plurality of the first electrodes capable of being used for pulsed ablation being disposed on each spoke.

[0014] Wherein, the distal end of the outer tube has a plane A perpendicular to its axis. When the distance between the distal end of the inner tube and the distal end of the outer tube is the closest, each spoke has a projection B on the outer side of the outer tube in the plane A, and the projection B encloses a projection plane C. An overlapping plane D exists between the projection planes C of two adjacent spokes, and the area ratio of the overlapping plane D to the projection plane C of any one of the two adjacent spokes is greater than or equal to 5% and less than or equal to 40%.

[0015] Further, the number of the spokes is greater than or equal to 5.

[0016] Further, when the distance between the distal end of the inner tube and the distal end of the outer tube is the closest, for any one spoke, the curve of the distal end of the spoke corresponding to its projection B has a tangent E, and the curve of the proximal end of the spoke corresponding to its projection B has a tangent F. Wherein, the tangent E and the tangent F have an included angle α, and 30° ≤ included angle α ≤ 70°.

[0017] Further, when the distance between the distal end of the inner tube and the distal end of the outer tube is the closest, for any one spoke, the curve of the outermost distal end of the spoke corresponding to its projection B has an intersection point G with the outer tube, and the curve of the innermost proximal end of the spoke corresponding to its projection B has an intersection point H with the outer tube. The axis of the outer tube and the plane A have an intersection point O. Wherein, the included angle ∠GOH is greater than or equal to 90° and less than or equal to 150°.

[0018] Further, the spokes are preformed into a spiral shape.

[0019] Further, the length of the spoke is L, and no first electrode is disposed within at least L / 4 length range at the proximal end of the spoke.

[0020] Further, the handle comprises: a handle body, the handle body being directly or indirectly connected to the outer tube, and a first chute being disposed along the length direction of the handle body; a push button, disposed on the handle body, and one end of the push button passing through the first chute and extending into the handle body being directly or indirectly connected to the inner tube.

[0021] Further, the handle further comprises: a slide rail, the slide rail being disposed in the handle body along the length direction of the handle body; a sliding sleeve, the sliding sleeve being sleeved on the slide rail, and the sliding sleeve being fixedly connected to the push button.

[0022] Further, the handle further comprises: a damping member, the damping member being disposed between the sliding sleeve and the slide rail.

[0023] Further, scales corresponding to the moving stroke of the push button are provided on the handle body.

[0024] The present application also provides an ablation system, which includes: the pulsed ablation catheter described in any one of the above.

[0025] Through the pulsed ablation catheter provided by the present application and the ablation system including the pulsed ablation catheter, wherein the pulsed ablation catheter can be switched between the "original state", the "flower basket state", and the "petal state" so as to be respectively suitable for pulsed ablation in the pulmonary vein and at the pulmonary vein ostium; especially in the third state, when the projection planes C of two adjacent spokes coincide and the area ratio of the coincidence plane D to the projection plane C is greater than or equal to 5%, more first electrodes can be provided on such a small and compact spline for ablation, so that during ablation, more precise ablation treatment can be performed on the specific affected part, reducing the treatment risk and improving the treatment effect.

[0026] The above description is only an overview of the technical solution of the present application. In order to make the technical means of the present application clearer and to the extent that those skilled in the art can implement it according to the content of the specification, and in order to make the above and other purposes, features, and advantages of the present application more obvious and understandable, the following takes the specific implementation manner of the present application as an example for illustration. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 : A side view schematic diagram of the pulsed ablation catheter in an embodiment of the present application;

[0028] Figure 2 : A schematic structural diagram of the spline in the first state in an embodiment of the present application;

[0029] Figure 3 : A schematic structural diagram of the spline in the second state in an embodiment of the present application;

[0030] Figure 4 : A schematic structural diagram of the spline in the third state in an embodiment of the present application;

[0031] Figure 5 : In an embodiment of the present application Figure 4 left view structural schematic diagram;

[0032] Figure 6 : In an embodiment of the present application Figure 5 structural schematic diagram showing only one spoke;

[0033] Figure 7 : A schematic structural diagram of the handle in an embodiment of the present application;

[0034] Figure 8: Schematic diagram of a pulsed ablation catheter for ablation within a pulmonary vein in an embodiment of the present application;

[0035] Figure 9 : Schematic diagram of a pulsed ablation catheter for ablation at the ostium of a pulmonary vein in an embodiment of the present application;

[0036] Figure 10 : S D / S C When S is relatively small, schematic diagram of the spline in the third state;

[0037] Figure 11 : When the included angle α is too small, schematic diagram of the spline in the third state;

[0038] Figure 12 : When the included angle α is too large, schematic diagram of the spline in the third state.

[0039] Description of reference numerals:

[0040] 100, handle; 110, handle body; 120, push button; 130, sliding sleeve; 140, slide rail; 141, fixing part; 150, first chute; 160, second chute;

[0041] 200, catheter assembly; 210, outer tube; 220, inner tube; 230, spline; 231, spoke; 232, first electrode; 240, second electrode; 250, mounting cap;

[0042] 300, heart;

[0043] 400, pulmonary vein. Detailed implementation manners

[0044] The following implementation manners of the present application are only used to illustrate the specific implementation manners of the present application, and these implementation manners cannot be understood as a limitation to the present application. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present application shall be regarded as equivalent replacement manners and fall within the protection scope of the present application.

[0045] Those skilled in the art should understand that in the disclosure of this application, terms such as "first", "second", "third", "fourth", "fifth", etc. are only used to distinguish different structures, and do not limit the quantity, connection relationship, etc. of specific structures; in addition, the orientation or positional relationship indicated by "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation to this application.

[0046] In this application, "proximal end" refers to the end close to the surgical operator, and "distal end" refers to the end far from the surgical operator (the end opposite to the "proximal end").

[0047] This embodiment provides a pulsed ablation catheter. Refer to Figures 1 - 9 , including: a handle 100; a catheter assembly 200, and the catheter assembly 200 is arranged at the distal end of the handle 100;

[0048] The catheter assembly 200 includes:

[0049] An outer tube 210;

[0050] An inner tube 220, the inner tube 220 is arranged inside the outer tube 210 along the length direction of the outer tube 210 and can move along the length direction of the outer tube 210, and the distal end of the inner tube 220 can protrude from the distal end of the outer tube 210;

[0051] A spline 230, the spline 230 includes: a plurality of spokes 231, the distal end of each spoke 231 is arranged at the distal end of the inner tube 220, and the proximal end of each spoke 231 is arranged at the distal end of the outer tube 210; a first electrode 232, and a plurality of the first electrodes 232 capable of being used for pulsed ablation are arranged on each spoke 231;

[0052] Wherein, the distal end of the outer tube 210 has a plane A perpendicular to its axis. When the distance between the distal end of the inner tube 220 and the distal end of the outer tube is the closest (refer to Figure 4 , Figure 5 ), each spoke 231 has a specific projection B (the part outside the outer tube 210) on the plane A. The projection B encloses a projection surface C (the outside of the outer tube 210, including the projection B itself). The projection surfaces C of two adjacent spokes 231 have a coincident surface D. The area ratio of the coincident surface D to the projection surface C of any one of the two adjacent spokes 231 (in this application, also simply referred to as "S D / SC ”) is greater than or equal to 5% and less than or equal to 40%.

[0053] It should be noted that Figure 5 is Figure 4 the left view of. To facilitate the display of the projection of the spoke 231 on the plane A, the plane shown in Figure 5 can be regarded as the plane A, Figure 5 and the spoke 231 in Figure 6 can be regarded as the projection on the plane A. The same applies hereinafter and will not be elaborated.

[0054] This embodiment provides a pulsed ablation catheter. The inner tube 220 can move along the length direction of the outer tube 210, thereby driving the spline 230 to move. When the distance between the distal end of the inner tube 220 and the distal end of the outer tube 210 is the farthest, it is in the first state (which can also be called the "original state", see Figure 2 ), which is convenient for reaching the specified ablation position through the guiding sheath; when the distal end of the inner tube 220 approaches the outer tube 210, it is in the second state (which can also be called the "flower basket state", see Figure 3 ). At this time, the spline 230 has a smaller radial dimension and a larger axial dimension, and is suitable for the catheter to enter the pulmonary vein for pulsed ablation (see Figure 8 ); when the distance between the distal end of the inner tube 220 and the distal end of the outer tube 210 is the closest, it is in the third state (which can also be called the "petal state", see Figure 4 ). At this time, the spline 230 has the largest radial dimension and is suitable for pulsed ablation of the pulmonary vein ostium and the vestibule (see Figure 9)。Compared with the existing annular catheter, the catheter of the present application is easier to abut against the myocardial tissue and the abutment is more reliable. When in the pulmonary vein (second state), the spokes of the spline can be expanded to achieve uniform abutment of each electrode with the tissue. When at the vestibule (third state), under the guidance of a matching guide wire, the catheter only needs to be pushed forward to achieve coverage and abutment of the pulmonary vein ostium; the catheter of the present application has more electrodes (first electrodes). Different from the linear electrode distribution of the existing annular catheter, the electrodes (first electrodes) of the catheter of the present application form a matrix distribution, with a larger ablation range and better continuity. Complete pulmonary vein isolation can be achieved with fewer ablation times, and the effectiveness of ablation is improved; the positions of the electrodes (first electrodes) of the catheter of the present application are relatively fixed, and generally the electrode spacing will not change. Under the set parameters, the arc phenomenon caused by too close electrodes can be avoided during ablation, improving safety. Especially in the present application, in the third state, the projection planes C of two adjacent spokes 231 overlap to a certain extent (the area ratio of the overlapping plane D to the projection plane C is greater than or equal to 5%). Just like the petals are arranged in a staggered manner, more "petals" (spokes) can be arranged on a "flower" (spline). At the same time, the distance between adjacent "petals" (spokes) is relatively close, so that the first electrode spacing between adjacent spokes is not too far. Therefore, more first electrodes can be arranged on such a small and compact ablation structure (spline), and the distribution of the first electrodes on the spline is relatively uniform (in the second state and the third state), so that during ablation, more precise ablation treatment can be performed on the specific affected part, reducing the treatment risk and improving the treatment effect.

[0055] Regarding the area ratio of the overlapping plane D to the projection plane C (S D / S C ), through the experiments of the inventor, it is found that when the area ratio is greater than or equal to 5%, it is beneficial to arrange more first electrodes. However, when the area ratio is greater than or equal to 40%, interference is likely to occur between the spokes and between the spokes / first electrodes. In order to ensure a more reasonable position between the first electrodes, the above area ratio (S D / S C ) is preferably 10% - 30%, and specifically, for example, it can be 10%, 15%, 20%, 25%, 30%. Regarding the number of spokes, it is preferably greater than or equal to 5, and more preferably 5 - 10. Specifically, for example, it can be 5, 6, 7, 8, 9, 10.

[0056] Regarding the materials of the outer tube / inner tube, existing medical polymer materials can be used. Specifically, for example, they can each independently be selected from one or a combination of two or more of nylon, polyether block polyamide, polyimide, polytetrafluoroethylene, etc.

[0057] As a comparison, see Figure 10 , in the third state, S D / S CWhen it is too small (less than 5%), only a small number of spokes can be set, resulting in a small number of first electrodes set on the spline; at the same time, on the outer side of the spline (away from the outer tube direction), the distance between adjacent spokes is large, resulting in a large distance between the first electrodes between the spokes, so that the distance between the first electrodes of one spoke and the distance between the first electrodes of adjacent spokes is too large, and the distribution of the first electrodes on the spline is too uneven (in the second state and the third state), which easily leads to a small electric field area generated by the electrodes in this solution and a small ablation area per time. During clinical operation, the number of ablation times will increase, resulting in a decrease in ablation efficiency and an increase in the overall time of the clinical operation.

[0058] In one embodiment, as Figure 5 shown, when the distance between the distal end of the inner tube and the distal end of the outer tube is the closest (third state), for any one of the spokes (such as Figure 5 the left spoke), the distal end of the spoke corresponds to a curve on its projection B with a tangent line E, and the proximal end of the spoke corresponds to a curve on its projection B with a tangent line F, where the included angle α between the tangent line E and the tangent line F satisfies 30° ≤ included angle α ≤ 70° (specifically, for example, it can be 30°, 40°, 50°, 60°, 70°). Thus, the distribution of the first electrodes between the spokes can be made more uniform (in the second state and the third state), which is beneficial for precise ablation; at the same time, it is beneficial for the curvature in the outer part of the spoke (such as Figure 5 away from the inner tube and the outer tube direction) to be larger, so that during ablation (such as Figure 8 , Figure 9 ), it is beneficial for the first electrode to adhere to the tissue and improve the ablation effect.

[0059] It should be noted that in this application, the projection B has a certain width. Therefore, the "curve of the projection B" specifically refers to the central axis of the projection B. In this application, the "central axis" refers to the locus formed by the centers of the largest inscribed circles in curves with a certain width.

[0060] As a comparison, see Figure 11 , in the third state, when the included angle α is too small (20°), it results in S D / S C being small, and its effect is similar to the effect described above Figure 10 .

[0061] As a comparison, see Figure 12 , in the third state, when the included angle α is too large (80°), it easily causes interference between the spokes and the first electrodes, and the distance between the first electrodes between adjacent spokes is too small. When releasing the electric field for ablation during clinical operation, the first electrodes that are relatively close to each other are prone to short - circuit or arc phenomena, affecting the safety of the ablation electric field and posing a certain risk to clinical operation.

[0062] In one embodiment, asFigure 6 As shown, when the distance between the distal end of the inner tube and the distal end of the outer tube is the closest (third state), for any one of the spokes, the curve of the projection B corresponding to the outermost end of the spoke has an intersection point G with the outer tube (outer edge), and the curve of the projection B corresponding to the innermost end of the spoke has an intersection point H with the outer tube (outer edge). The axis of the outer tube has an intersection point O with the plane A, where the included angle ∠GOH is greater than or equal to 90° and less than or equal to 150°, preferably greater than or equal to 90° and less than or equal to 120° (such as 90°, 100°, 110°, 120°). Similarly, it can make the distribution of the first electrodes between the spokes more uniform, which is beneficial to precise ablation; at the same time, it is beneficial to have a greater curvature in the outer part of the spokes (such as Figure 5 in the direction away from the inner tube and the outer tube), so as to facilitate the first electrode to abut against the tissue during ablation (such as Figure 8 、 Figure 9 ), and improve the ablation effect.

[0063] In one embodiment (refer to Figure 2 ), the spokes are pre-shaped into a spiral shape. Thus, it is beneficial to achieve the effects of the above two embodiments (make the distribution of the first electrodes between the spokes more uniform, which is beneficial to precise ablation; at the same time, it is beneficial to have a greater curvature in the outer part of the spokes (such as Figure 5 in the direction away from the inner tube and the outer tube), so as to facilitate the first electrode to abut against the tissue during ablation (such as Figure 8 、 Figure 9 ), and improve the ablation effect).

[0064] Regarding the material of the spokes, specifically, for example, the outer layer of the spokes can be a polymer material (such as nylon, polyether block polyamide, etc.), and the inner layer of the spokes can be a shape memory alloy material (such as nitinol, etc.).

[0065] In one embodiment, as Figures 2 - 4 shown, the length of the spoke is L, and no first electrode is provided within at least L / 4 length range at the proximal end of the spoke. This embodiment is an adaptive design for the above embodiments, that is, when the "petals" (spokes) are staggered, such as in the second state, especially in the third state, it is difficult for the proximal end of the spoke to contact the tissue for ablation. Therefore, no first electrode is provided.

[0066] In one embodiment, as Figure 7 shown (in order to show the internal structure, part of the handle body 110 is hidden), the handle 100 includes: a handle body 110, the handle body 110 is directly or indirectly connected to the outer tube 210, and the handle body is provided with a first chute 150 along its length direction; a push button 120, arranged on the handle body 110, and one end of the push button 120 passing through the first chute and extending into the handle body is directly or indirectly connected to the inner tube.

[0067] This embodiment provides a specific structure of the handle 100, which can drive the relative movement of the inner tube 220 and the outer tube 210 by moving the push button 120 along the length direction of the handle body 110 (i.e., along the first chute 150), so as to realize the three states of the above spline; at the same time, the first chute 150 restricts the circumferential rotation of the push button 120 along the handle body 110, so as to prevent the distal end of the spline from rotating circumferentially relative to the proximal end along the catheter when the spline switches between the three states, so as to ensure that the spline switches states in a predetermined manner.

[0068] In one embodiment, as Figure 7 shown, the handle 100 further includes: a slide rail 140, which is arranged in the handle body along the length direction of the handle body (specifically, two slide rails 140 are arranged in this embodiment); a sliding sleeve 130, which is sleeved on the slide rail 140, and the sliding sleeve is fixedly connected with the push button 120.

[0069] In this embodiment, the inner tube 220 is specifically fixedly connected to the sliding sleeve 130.

[0070] Through the combination of the slide rail 140 and the sliding sleeve 130, the stability of the push button 120 along the length direction of the handle body 110 is ensured.

[0071] It should be noted that in this embodiment, a second chute 160 is further arranged on the sliding sleeve 130 to accommodate the fixing part 141 of the slide rail 140, which further limits the rotation of the sliding sleeve 130 and the push button 120 connected thereto in the circumferential direction of the handle body through the fixing part 141 of the slide rail 140, ensuring the movement stability.

[0072] In one embodiment, as Figure 7 shown, the handle 100 further includes: a damping member (not shown in the figure), which is arranged between the sliding sleeve 130 and the slide rail 140. Thus, while realizing the stepless adjustment of the relative position of the inner tube 220 and the outer tube 210, the relative position can also be maintained, reducing the operation difficulty of the operator.

[0073] Regarding the material of the damping member, specifically, it can be silicone rubber, fluoroplastic material, etc.

[0074] In one embodiment, a scale corresponding to the moving stroke of the push button 120 is arranged on the handle body 110 (not shown in the figure). The scale can specifically be a scale showing length or a scale showing the state shape of the spline, so that the operator can more clearly judge the deployment state of the spline 230, which is beneficial to more accurate ablation operation.

[0075] Regarding the position of the scale, for example, it is specifically arranged on one side of the first chute 150.

[0076] In addition, the catheter assembly 200 of the present application can further include a mounting cap 250 provided at the distal end of the inner tube 220 to facilitate fixing the distal end of the spoke 231. In addition, a second electrode 240 can be provided at the distal end of the outer tube 210 for electrical positioning.

[0077] Based on the above-described pulsed ablation catheter, those skilled in the art know that the above pulsed ablation catheter is combined with other supporting devices (such as a pulsed signal generator, a magnetic positioning device, etc.) to form an ablation system for use in pulsed ablation surgery.

[0078] Although the above embodiments of the present application have been described, the present application is not limited to the above specific embodiments and application fields. The above specific embodiments are merely illustrative and guiding, rather than restrictive. Those of ordinary skill in the art can also make many forms under the inspiration of this specification and without departing from the scope protected by the claims of the present application, and these all fall within the scope claimed by the present application.

Claims

1. A pulsed ablation catheter, comprising: A handle; A catheter assembly disposed at the distal end of the handle; Characterized in that The catheter assembly includes: An outer tube; An inner tube disposed within the outer tube along the length direction of the outer tube and capable of moving along the length direction of the outer tube, and the distal end of the inner tube can protrude beyond the distal end of the outer tube; A spline, the spline includes: a plurality of spokes, the distal end of each spoke is disposed at the distal end of the inner tube, and the proximal end of each spoke is disposed at the distal end of the outer tube; a first electrode, and a plurality of the first electrodes capable of being used for pulsed ablation are disposed on each spoke; Wherein, the distal end of the outer tube has a plane A perpendicular to its axis. When the distance between the distal end of the inner tube and the distal end of the outer tube is the closest, each spoke has a projection B on the outer side of the outer tube in the plane A, and the projection B encloses a projection surface C. The projection surfaces C of two adjacent spokes have a coincidence surface D, and the area ratio of the coincidence surface D to the projection surface C of any one of the two adjacent spokes is greater than or equal to 5% and less than or equal to 40%.

2. The pulsed ablation catheter according to claim 1, wherein The number of spokes is greater than or equal to 5.

3. The pulsed ablation catheter according to claim 1, wherein When the distance between the distal end of the inner tube and the distal end of the outer tube is the closest, for any one of the spokes The curve of the distal end of the spoke corresponding to its projection B has a tangent line E, The curve of the proximal end of the spoke corresponding to its projection B has a tangent line F, Wherein, the tangent line E and the tangent line F have an included angle α, and 30° ≤ included angle α ≤ 70°.

4. The pulsed ablation catheter according to claim 1, wherein When the distance between the distal end of the inner tube and the distal end of the outer tube is the closest, for any one of the spokes The curve of the outermost distal end of the spoke corresponding to its projection B has an intersection point G with the outer tube, The curve of the nearest proximal end of the spoke corresponding to its projection B has an intersection point H with the outer tube, The axis of the outer tube has an intersection point O with the plane A, Wherein, the included angle ∠GOH is greater than or equal to 90° and less than or equal to 150°.

5. The pulsed ablation catheter according to claim 1, wherein The spokes are pre-shaped into a spiral shape.

6. The pulsed ablation catheter according to claim 1, wherein The length of the spoke is L, and no first electrode is provided within at least L / 4 length range of the proximal end of the spoke.

7. The pulsed ablation catheter according to claim 1, wherein The handle includes: A handle body directly or indirectly connected to the outer tube, and a first chute is provided along the length direction of the handle body; A push button disposed on the handle body, and one end of the push button passing through the first chute and extending into the handle body is directly or indirectly connected to the inner tube.

8. The pulsed ablation catheter according to claim 7, wherein The handle further includes: A slide rail disposed within the handle body along the length direction of the handle body; A sliding sleeve sleeved on the slide rail, and the sliding sleeve is fixedly connected to the push button.

9. The pulsed ablation catheter according to claim 8, wherein The handle further includes: a damping member disposed between the sliding sleeve and the slide rail.

10. The pulsed ablation catheter according to claim 7, wherein a scale corresponding to the moving stroke of the push button is provided on the handle body.

11. An ablation system, wherein, Comprising: The pulsed ablation catheter according to any one of claims 1 to 10.

Images