CN113768615B

CN113768615B - Ablation catheter

Info

Publication number: CN113768615B
Application number: CN202111112231.8A
Authority: CN
Inventors: 刘强; 蒋晨阳; 董元博; 罗小平; 张明芳
Original assignee: Suzhou Sainasi Medical Technology Co ltd
Current assignee: Suzhou Sainasi Medical Technology Co ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2023-09-22
Anticipated expiration: 2041-09-18
Also published as: CN113768615A

Abstract

The application relates to an ablation catheter comprising: a conduit portion; the electrode part is arranged at the far end of the catheter part and comprises a fixed electrode and a movable electrode, the fixed electrode is fixedly arranged relative to the catheter part, and the movable electrode is movably arranged relative to the fixed electrode; wherein the movable electrode is configured to be movable toward and away from the fixed electrode, and to perform a capturing operation of a target tissue in a capturing position together with the fixed electrode. According to the application, the movable electrode is in sliding connection with the fixed electrode so as to enable the movable electrode to move close to or far from the fixed electrode, the movable electrode is a capturing position when the movable electrode is close to the fixed electrode, at the moment, the movable electrode is matched with the fixed electrode to perform capturing operation on target tissues, and the target tissues are ablated after capturing and stabilizing, so that the position between the target tissues and the electrode part in the ablation process is firmer, and the ablation is facilitated to be performed more efficiently.

Description

Ablation catheter

Technical Field

The application relates to the technical field of medical catheters, in particular to an ablation catheter.

Background

The left ventricular chordae tendineae are derived from the endo-muscular layer of the original heart, mostly dense fibrous tissue, and a minority of the endocardial-wrapped myocardium. Numerous clinical studies have shown that there is a correlation between pseudo-chordae and ventricular premature beat, due to: 1. the histological sub-microstructure proves that purkinje cells exist in the pseudo-chordae, and the special conduction cells have autonomy, so that the purkinje cells become ectopic rhythm points of the ventricular premature; 2. the attachment point of the pseudo-chordae is mechanically pulled during diastole to excite the excitation of the ectopic rhythmic point to be increased, thereby becoming the cause of ventricular premature beat; 3. possibly related to reentry caused by the formation of loops between the pseudochordae and normal myocardium and conducting tissue. In short, the presence of the left ventricular chordae tendineae is likely to cause ventricular premature onset, but does not cause the onset of malignant ventricular premature onset with high risk. Ventricular tachycardia is also caused by higher excitability of the muscular chordae, which may also be excited by the involvement of ventricular diastole. At present, an ablation catheter is mainly used for ablating the pseudo chordae in the ventricular premature beat caused by the left ventricular pseudo chordae in clinic, and the existing ablation catheter cannot fix the pseudo chordae in the process of ablating by adopting the existing ablation catheter, so that the contact between an ablation electrode on the ablation catheter and the pseudo chordae is unstable due to the pulsation of the ventricle, the operation time is increased, and the success rate of the operation is even reduced.

Disclosure of Invention

Based on this, it is necessary to provide an ablation catheter which can perform ablation after fixing the pseudo chordae in the ventricle, thereby shortening the operation time and improving the success rate of the operation.

An ablation catheter, comprising:

a conduit portion;

the electrode part is arranged at the far end of the catheter part and comprises a fixed electrode and a movable electrode, the fixed electrode is fixedly arranged relative to the catheter part, and the movable electrode is movably arranged relative to the fixed electrode;

wherein the movable electrode is configured to be movable toward and away from the fixed electrode, and to perform a capturing operation of a target tissue in a capturing position together with the fixed electrode.

In one embodiment, the movable electrode is further configured to move away from the fixed electrode and separate from the fixed electrode in a released position.

In one embodiment, the movable electrode is configured to switch between the capture position and the release position in a sliding manner relative to the fixed electrode.

In one embodiment, the catheter section comprises a tube body, a handle portion disposed at a proximal end of the tube body, and a connector at a distal end of the tube body and fixedly connected to the electrode section;

the handle part comprises a rotating end which is fixedly connected with the connecting piece so as to controllably adjust the connecting piece to drive the electrode part to rotate.

In one embodiment, the tube body comprises a multi-lumen tube, the multi-lumen tube comprises a first accommodating cavity and a second accommodating cavity which are mutually independent, the axis of the first accommodating cavity coincides with the axis of the tube body, the first accommodating cavity and the second accommodating cavity are both used for accommodating the wire harness, and the first accommodating cavity is connected with the rotating end and the connecting piece.

In one embodiment, the handle portion includes a bend-adjusting end, and the tube body further includes a bend-adjusting sheath tube disposed about the outer periphery of the multi-lumen tube;

the bending sheath tube is internally provided with a third accommodating cavity, and the third accommodating cavity is used for accommodating a wire harness which is connected between the connecting piece and the bending end and used for adjusting the bending angle of the electrode part.

In one embodiment, the bending end includes a rotating rod and a sliding block, the sliding block is movably connected with the rotating rod, and can move along the axial direction of the rotating rod, the sliding block is connected with the wire harness in the third accommodating cavity, and the rotating rod is rotated to control the sliding block to move.

In one embodiment, the bending adjustment sheath is configured as a multi-segment tube structure having different stiffness to adjust the bending angle of the electrode portion.

In one embodiment, the handle portion includes a fixed end and a sliding end;

the fixed end is connected with the pipe body, and the sliding end is electrically connected with the movable electrode so as to control the movable electrode to slide relative to the fixed electrode.

In one embodiment, the fixed electrode includes a first capturing end and a first connecting end that are connected to each other, a first connecting cavity is formed in the first connecting end in a hollow manner, the movable electrode is slidably disposed in the first connecting cavity, and the first capturing end is configured to be located on a sliding path of the movable electrode.

In one embodiment, one of the first connection end and the movable electrode is provided with a first limit groove extending along the sliding direction of the movable electrode, and the other one is provided with a limit pin;

the limiting pin is arranged in the first limiting groove in a sliding mode to limit the sliding path of the movable electrode relative to the fixed electrode.

In one embodiment, the ablation catheter includes an elastic member deformably abutting between the movable electrode and the catheter portion along a sliding direction of the movable electrode.

In one embodiment, the ablation catheter comprises a limiting block, a second connecting cavity is formed in the fixed electrode in a hollow mode, and the limiting block is arranged in the second connecting cavity in a sliding mode;

the fixed electrode is provided with a second limit groove extending along the sliding direction of the movable electrode, the movable electrode comprises a second capturing end and a second connecting end which are connected with each other, the second connecting end is arranged in the second limit groove in a sliding mode and extends into the second connecting cavity to be connected with the limit block, and the fixed electrode is configured to be positioned on a sliding path of the second capturing end;

the size of the limiting block is larger than the caliber of the second limiting groove.

Above-mentioned ablation catheter, movable electrode and fixed electrode sliding connection to make movable electrode be close to or keep away from fixed electrode motion, be the position of arresting when movable electrode is close to fixed electrode, the movable electrode is carried out the operation of arresting to target tissue with fixed electrode cooperation this moment, and the target tissue is ablated after arresting firmly, from this, makes the position between target tissue and the electrode part more firm in the ablation process, is favorable to more efficient to ablate.

Drawings

FIG. 1 is a schematic view showing the overall structure of an ablation catheter according to a first embodiment of the present application;

FIG. 2 is a cross-sectional view of an electrode portion of the ablation catheter of FIG. 1;

FIG. 3 is a schematic view of the construction of a capture electrode in the ablation catheter of FIG. 1;

FIG. 4 is a schematic view of the construction of a capture electrode in the ablation catheter of FIG. 1;

FIG. 5 is a schematic view of the construction of a capture electrode in the ablation catheter of FIG. 1;

FIG. 6 is a schematic view of the structure of an electrode portion of the ablation catheter of FIG. 1;

FIG. 7 is a schematic view of the configuration of a sliding electrode in the ablation catheter of FIG. 1;

FIG. 8 is a cross-sectional view of a multi-lumen tube in the ablation catheter of FIG. 1;

FIG. 9 is a cross-sectional view of a handle portion of the ablation catheter of FIG. 1;

FIG. 10 is a schematic view of the overall structure of an ablation catheter according to a second embodiment of the application;

FIG. 11 is a cross-sectional view of an electrode portion of the ablation catheter of FIG. 10;

FIG. 12 is a cross-sectional view of an electrode portion of the ablation catheter of FIG. 10;

FIG. 13 is a schematic view of the capturing end of the ablation catheter of FIG. 10;

FIG. 14 is a schematic view of the configuration of a sliding electrode in the ablation catheter of FIG. 10;

fig. 15 is a cross-sectional view of an electrode portion in a third embodiment of the application;

FIG. 16 is a cross-sectional view of an electrode portion in a third embodiment of the application;

FIG. 17 is a schematic structural view of a capturing end in a third embodiment of the present application;

fig. 18 is a schematic structural diagram of a sliding electrode in a third embodiment of the present application.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Example 1

Fig. 1 shows a schematic overall structure of an ablation catheter according to a first embodiment of the present application, fig. 2 shows a cross-sectional view of an electrode portion according to the first embodiment of the present application, and fig. 3 shows a schematic structure of a capturing electrode according to the first embodiment of the present application.

Referring to fig. 1-3, an embodiment of the present application provides an ablation catheter 100 including a catheter portion 10 and an electrode portion 20. Wherein the electrode portion 20 is disposed at the distal end of the catheter portion 10 and includes a fixed electrode 21 and a movable electrode 22. The fixed electrode 21 is fixedly disposed relative to the catheter portion 10, and the movable electrode 22 is movably disposed relative to the fixed electrode 21. The movable electrode 22 is configured to be movable toward and close to the fixed electrode 21, and performs a capturing operation of the target tissue in conjunction with the fixed electrode 21 at a capturing position. The capturing operation of the target tissue is completed by the relative movement of the movable electrode 22 and the fixed electrode 21. After the capture is stable, the target tissue is ablated, so that the ablation process is more stable, and the operation efficiency and success rate are improved.

Further, the movable electrode 22 is also configured to be movable away from the fixed electrode 21 and to be separated from the fixed electrode 21 in a released position. Thus, when the ablation of the target tissue by the electrode portion 20 is completed, the movable electrode 22 is separated from the fixed electrode 21, thereby facilitating evacuation of the ablation catheter 100 from the human body.

In some embodiments, the movable electrode 22 is configured to switch between a capture position and a release position in a sliding manner relative to the fixed electrode 21. The movable electrode 22 is close to or far away from the fixed electrode 21 in a sliding manner, so that the overall structure of the ablation catheter 100 is simpler and convenient to operate.

In some embodiments, the fixed electrode 21 includes a first capturing end 211 and a first connecting end 212 connected to each other, a first connecting cavity 2121 is formed in the first connecting end 212, the movable electrode 22 is slidably disposed in the first connecting cavity 2121, and the first capturing end 211 is configured to be located in a sliding path of the movable electrode 22. The first connection lumen 2121 provides a sliding channel for the movable electrode 22 so that the movable electrode 22 can better mate with the fixed electrode 21 to fix the target tissue. In addition, the first connecting cavity 2121 can also play a limiting role on the movable electrode 22, so that the overall structure is more stable.

Fig. 4 and 5 are schematic diagrams showing the structure of the capturing electrode in the first embodiment of the present application, fig. 6 is a schematic diagram showing the structure of the electrode portion in the first embodiment of the present application, fig. 7 is a schematic diagram showing the structure of the sliding electrode in the first embodiment of the present application, fig. 8 is a sectional view of the multi-lumen tube in the first embodiment of the present application, and fig. 9 is a sectional view of the handle portion in the first embodiment of the present application.

In this embodiment, the first capturing end 211 includes a connection portion 2111 and a hook portion 2112. One end of the connection portion 2111 is connected to the first connection end 212, and the other end is connected to the hook portion 2112. Wherein the hook body portion 2112 is configured in a hook-shaped configuration that curves inward to secure the target tissue. The hook-shaped structure is designed to facilitate capturing and securing the target tissue, and in other embodiments, the hook body portion 2112 may be configured in a semi-circular or "V" shape, as shown in fig. 4 and 5. It will be appreciated that other similar structures for capturing and fixing the device will fall within the scope of the present application, and will not be described herein.

Referring to fig. 6 and 7, in some embodiments, one of the first connecting end 212 and the movable electrode 22 is provided with a first limiting groove 221 extending along the sliding direction of the movable electrode 22, and the other is provided with a limiting pin 2122. The limiting pin 2122 is slidably disposed in the first limiting groove 221, so as to limit a sliding path of the movable electrode 22 relative to the fixed electrode 21. In this embodiment, the first limiting groove 221 is formed on the movable electrode 22, and the limiting pin 2122 is fixed to the first connecting end 212. When the movable electrode 22 slides in the first connecting cavity 2121, the limiting pin 2122 moves in the first limiting groove 221, and when the inner wall of the first limiting groove 221 abuts against the limiting pin 2122, the movable electrode 22 stops moving. Thus, the movable electrode 22 can be moved within a prescribed path to meet the actual demand.

Referring to fig. 1 and 2 again, in order to make the sliding of the movable electrode 22 in the first connection cavity 2121 more stable, the ablation catheter 100 includes an elastic member 30, and the elastic member 30 is deformably abutted between the movable electrode 22 and the catheter portion 10 along the sliding direction of the movable electrode 22. In particular, in the present embodiment, the elastic member 30 is provided as a pressure spring that provides a cushion for the sliding movement of the movable electrode 22.

In some embodiments, the catheter section 10 includes a tube body 11, a handle portion 12, and a connector 13. The handle 12 is disposed at the proximal end of the tube body 11, and the connecting member 13 is disposed at the distal end of the tube body 11 and fixedly connected to the electrode portion 20. The handle portion 12 includes a rotating end 121, and the rotating end 121 is fixedly connected to the connecting member 13 to controllably adjust the connecting member 13 to rotate the electrode portion 20. Specifically, the rotating end 121 can rotate in its radial direction, so that the adjustment connector 13 rotates the electrode portion 20. Simple structure, convenient operation is favorable to electrode part 20 accurate positioning target tissue.

As shown in fig. 8, further, the tube body 11 includes a multi-lumen tube 111, and the multi-lumen tube 111 includes a first accommodation chamber 1111 and a second accommodation chamber 1112 which are provided independently of each other. The axis of the first accommodating cavity 1111 coincides with the axis of the tube body 11, the first accommodating cavity 1111 and the second accommodating cavity 1112 are both used for accommodating the wire harness, and the first accommodating cavity 1111 is connected with the rotating end 121 and the connecting piece 13. Specifically, a connection cable is disposed in the first receiving chamber 1111 and connects the rotating end 121 and the connecting member 13. Since the axis of the first receiving chamber 1111 coincides with the axial direction of the tube body 11, when the rotating end 121 is controlled, the torsion wire rotates with the rotating end 121, so that the adjustment connector 13 rotates the electrode portion 20. Thereby, the electrode portion 20 is controlled to rotate toward the target tissue, thereby ablating the target tissue.

In addition, the second accommodating chambers 1112 may be provided in plurality and respectively surround the first accommodating chambers 1111 for accommodating different wire harnesses. In this embodiment, the second accommodating cavity 1112 includes two first sub-cavities and second sub-cavities, and is used for accommodating the electrode wire and the bending wire respectively. Wherein the electrode lead is used to connect the electrode portion 20 for providing ablation energy to the electrode portion 20. The bending adjustment wires are used to control the bending angle of the electrode part 20. It should be noted that the bending-adjusting wire may be selectively disposed in the second accommodating cavity 1112 or the third accommodating cavity 1121 according to specific usage conditions, and both the two disposing methods can achieve the purpose of bending adjustment. The plurality of second accommodating cavities 1112 which are mutually independent are arranged, so that different wire bundles can be ensured to be respectively positioned in independent cavities and are not mutually influenced. It will be appreciated that in other embodiments, the second receiving cavity 1112 may be provided in a plurality, depending on the number of strands actually required to be received.

Referring again to fig. 2, in some embodiments, the handle portion 12 includes a bend-adjusting end 122 and the tube body 11 further includes a bend-adjusting sheath 112 disposed about the outer periphery of the multi-lumen tube 111. A third accommodating cavity 1121 is formed in the bending sheath 112, and the third accommodating cavity 1121 is used for accommodating a wire harness connected between the connecting piece 13 and the bending end 122 and used for adjusting the bending angle of the electrode portion 20. The target tissue can be ablated more accurately by controlling the bending angle of the electrode portion 20 by adjusting the bending sheath 112 so as to align the electrode portion 20 with the target tissue.

Further, as shown in fig. 9, the bending end 122 includes a rotating rod 1221 and a slider 1222, and the slider 1222 is movably connected to the rotating rod 1221 and can move along the axial direction of the rotating rod 1221. The slider 1222 is connected to the wiring harness in the third receiving cavity 1121, and rotates the rotary lever 1221 to control movement of the slider 1222. Specifically, the rotary rod 1221 is threadedly coupled to the slider 1222. The rotary rod 1221 has a first thread on an outer side surface thereof, the slider 1222 has a second thread engaged with the first thread, and the rotary rod 1221 is engaged with the slider 1222. When the rotating rod 1221 is rotated, the slider 1222 is moved along the axial direction of the rotating rod 1221 along with the screw thread, thereby driving the wire harness connected thereto in the third accommodation chamber 1121, and the wire harness drives the electrode section 20 to bend through the connection member 13. Thus, by rotating the rotating lever 1221, the bending angle of the electrode part 20 can be quickly adjusted, enabling the electrode part 20 to more accurately locate the target tissue. It will be appreciated that in other embodiments, the rotary lever 1221 and the slider 1222 may be coupled in other ways, such as by a snap fit, or by a rail fit, etc. Similar structures enable axial movement of the slider 1222 along the rotation rod 1221, which is not described in detail herein.

In some embodiments, the bend-adjusting sheath 112 is configured as a multi-segment tube structure having different durometers to adjust the bend angle of the electrode portion 20. In particular to the present example, the buckle-accommodating sheath 112 includes a first end and a second end. The first end is connected to the electrode portion 20 and is a flexible material end. The second end is connected to the handle portion 12 and is a rigid material end. Specifically, a bending wire having one end connected to the handle portion 12 and the other end connected to the electrode portion 20 is provided in the third accommodation chamber 1121. The texture of the second end is hard due to the soft texture of the first end. When the control handle portion 12 pulls the bending adjustment wire, the first end bends toward the side of the handle portion 12, thereby bending the electrode portion 20 and controlling the bending angle of the electrode portion 20.

Referring again to fig. 1, in some embodiments, the handle portion 12 further includes a fixed end 123 and a sliding end 124. The fixed end 123 is connected to the tube body 11, and the sliding end 123 is connected to the movable electrode 22 in a communication manner to control the movable electrode 22 to slide relative to the fixed electrode 21. Thus, the electrode portions 20 are controlled to complete the corresponding operation steps through the different operation ends provided on the handle portion 12, which is convenient and quick.

It should be noted that in some embodiments, the handle portion 12 further includes a venting device 125 and a connector 126. One end of the exhaust device 125 communicates with the multi-lumen tube 111 and the bending sheath tube 112, and the other end communicates with the outside to exhaust air in the multi-lumen tube 111 and the bending sheath tube 112. Thereby, the safety of the ablation catheter 100 into the human body can be ensured. The connector 126 is electrically connected to the electrode portion 20 and an external power generator (not shown) for providing power to the operation of the electrode portion 20 for controlling the operation of the electrode portion 20 by the handle portion 12, respectively.

It should be noted that in some embodiments, the electrode portion 20 further includes a mapping electrode 23 for detecting and recording electrophysiological signals within the body. The mapping electrode 23 is disposed outside the tube body 11, and includes a plurality of electrodes disposed at intervals. In this embodiment, the mapping electrodes 23 include four mapping electrodes 23 disposed at intervals, and the intervals between the four mapping electrodes 23 are 2mm, 5mm, and 2mm, respectively. The mapping electrode 23 is connected with a connector at the tail end through a lead, and performs potential mapping and heart cavity structure modeling and other treatments on target tissues under the cooperation of external equipment, so as to guide the ablation catheter 100 to work in the heart cavity.

Example two

Fig. 10 shows a schematic overall structure of an ablation catheter according to a second embodiment of the present application, fig. 11 and fig. 12 show cross-sectional views of electrode portions according to the second embodiment of the present application, fig. 13 shows a schematic structure of a capturing end according to the second embodiment of the present application, and fig. 14 shows a schematic structure of a sliding electrode according to the second embodiment of the present application.

Fig. 10 shows a schematic overall structure of a second embodiment, which differs from the first embodiment mainly in the structure of the electrode portion 20. As shown in fig. 11, 13 and 14, the ablation catheter 100 includes a stopper 40, a second connecting cavity 213 is formed in the fixed electrode 21, and the stopper 40 is slidably disposed in the second connecting cavity 213. The fixed electrode 21 is provided with a second limiting groove 214 extending along the sliding direction of the movable electrode 22, the movable electrode 22 comprises a second capturing end 222 and a second connecting end 223 which are connected with each other, the second connecting end 223 is slidably arranged in the second limiting groove 214 and extends into the second connecting cavity 213 to be connected with the limiting block 40, and the fixed electrode 21 is configured to be located on the sliding path of the second capturing end 222. Wherein, the size of the limiting block 40 is larger than the caliber of the second limiting groove 214. The stopper 40 slides in the second connection chamber 213 in the sliding direction of the movable electrode 22, and thus can serve to restrict the movement path of the movable electrode 22.

In addition, the second capturing end 222 has a first connection surface 2221, and the first connection surface 2221 is disposed at an angle to the second connection end 223 and is inclined toward the second connection end 223. The fixed electrode 21 has a second connection surface 215 disposed opposite to the first connection surface 2221, and the second connection surface 215 is parallel to and bonded to the first connection surface 2221.

As shown in fig. 12, when the movable electrode 22 cooperates with the fixed electrode 21 to perform capturing of the target tissue, the first connection surface 2221 and the second connection surface 215 are closely attached, so that there is almost no gap between the fixed electrode 21 and the movable electrode 22, and the safety of catheter intervention is improved. In addition, the first connection surface 2221 is disposed at an angle with the second connection end 223, and inclines towards one side of the second connection end 223, which is more beneficial to capturing the target tissue.

Example III

Fig. 15 and 16 are cross-sectional views of electrode portions in the third embodiment of the present application, fig. 17 is a schematic view showing the structure of the capturing end in the third embodiment of the present application, and fig. 18 is a schematic view showing the structure of the sliding electrode in the third embodiment of the present application.

The third embodiment differs from the first embodiment mainly in the structure of the second capturing end 222. As shown in fig. 15 to 18, in this embodiment, the second capturing end 222 has a first connection surface 2221, and the first connection surface 2221 is disposed at an angle to the second connection end 223 and is inclined toward a direction away from the second connection end 223. The fixed electrode 21 has a second connection surface 215 disposed opposite to the first connection surface 2221, and the second connection surface 215 is parallel to and bonded to the first connection surface 2221.

It can be appreciated that, during actual use, the shape of the second capturing end 222 and the inclination direction of the first connecting surface 2221 can be adjusted accordingly according to the actual use requirement, which is not described herein.

In the specific use of the present application, the air in the multi-lumen tube 111 and the bending sheath tube 112 is exhausted by the exhaust device 125. The movable electrode 22 is held in the capture position and extends into the target area along the catheter sheath. By controlling the bending end 122 on the handle portion 12, the bending angle of the electrode portion 20 is adjusted so as to be in contact with the target tissue. And further controls the sliding end 123 on the handle portion 12 to switch the movable electrode 22 to the released position. At this time, the opening of the catching end is aligned with the target tissue by controlling the rotating end 121 of the handle portion 12, and the target tissue is caught by the fixed electrode 21 and the movable electrode 22 being engaged with each other. And further electrically connected to an external energy generator by connector 126 to provide energy for ablating the target tissue.

The ablation catheter 100 of the above embodiment has at least the following advantages:

1) The movable electrode 22 is matched with the fixed electrode 21 to capture and fix the target tissue, so that unstable contact between the electrode part 20 and the target tissue caused by ventricular pulsation in the ablation process is avoided, and the efficiency and success rate of the operation are effectively improved;

2) The torsion steel cable is arranged in the first accommodating cavity 1111, one end of the torsion steel cable is connected with the handle part 12, and the other end of the torsion steel cable is connected with the electrode part 20, so that the electrode part 20 can rotate along with the torsion steel cable under the control of the torsion steel cable, and the target tissue can be captured more efficiently and accurately;

3) Because the torsion steel cable and the bending sheath 112 are relatively and independently arranged, the electrode part 20 can still be rotationally adjusted under the condition that the head end of the bending sheath 112 is bent, and the mutual influence is avoided;

4) The bending sheath 112 is disposed at the outer circumference of the multi-lumen tube 111 and has a soft end connected to the electrode portion 20 and a hard end connected to the handle portion 12, and the bending angle of the electrode portion 20 can be conveniently and rapidly adjusted by controlling the bending wire positioned in the bending sheath 112, so that the electrode portion 20 is more flexible and easy to operate.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. An ablation catheter, comprising:

a conduit portion;

wherein the movable electrode is configured to be movable toward and away from the fixed electrode and to perform a capturing operation of a target tissue in conjunction with the fixed electrode at a capturing position;

the catheter part comprises a catheter body, a handle part and a connecting piece, wherein the handle part is arranged at the proximal end of the catheter body, and the connecting piece is positioned at the distal end of the catheter body and fixedly connected with the electrode part; the handle portion includes a rotational end;

the tube body comprises a multi-cavity tube, the multi-cavity tube comprises a first accommodating cavity which coincides with the axis of the tube body, and the first accommodating cavity is used for accommodating a wire harness which is connected between the rotating end and the connecting piece and used for adjusting the connecting piece to drive the electrode part to rotate;

the handle part further comprises a bending end, and the tube body further comprises a bending sheath tube arranged on the periphery of the multi-cavity tube; the bending sheath tube is internally provided with a third accommodating cavity, and the third accommodating cavity is used for accommodating a wire harness which is connected between the connecting piece and the bending end and used for adjusting the bending angle of the electrode part.

2. The ablation catheter of claim 1, wherein the movable electrode is further configured to move away from the fixed electrode and separate from the fixed electrode in a released position.

3. The ablation catheter of any of claims 1-2, wherein the movable electrode is configured to switch between the capture and release positions in a sliding manner relative to the fixed electrode.

4. The ablation catheter of claim 1, wherein the multi-lumen tube further comprises a second lumen disposed independently of the first lumen.

5. The ablation catheter of claim 1, wherein a connection cable is disposed within the first housing lumen, the connection cable connecting the rotational end with the connector.

6. The ablation catheter of claim 1, wherein the bend end comprises a rotating rod and a slider, the slider is movably connected with the rotating rod and can move along the axial direction of the rotating rod, the slider is connected with the wire harness in the third accommodating cavity, and the rotating rod is rotated to control the slider to move.

7. The ablation catheter of claim 1, wherein the bend-adjusting sheath is configured as a multi-segment tube structure having different durometers to adjust the bend angle of the electrode portion.

8. The ablation catheter of claim 1, wherein the handle portion comprises a fixed end and a sliding end;

9. The ablation catheter of claim 1, wherein the fixed electrode comprises a first capture end and a first connection end that are connected to each other, the first connection end being hollow therein to form a first connection lumen, the movable electrode being slidably disposed within the first connection lumen, the first capture end being configured to be positioned in a sliding path of the movable electrode.

10. The ablation catheter of claim 9, wherein one of the first connection end and the movable electrode is provided with a first limit groove extending along the sliding direction of the movable electrode, and the other one is provided with a limit pin;

11. The ablation catheter of claim 1, comprising an elastic member deformably abutting between the movable electrode and the catheter portion along a sliding direction of the movable electrode.

12. The ablation catheter of claim 1, wherein the ablation catheter comprises a stopper, the fixed electrode is hollow to form a second connection lumen, and the stopper is slidably disposed within the second connection lumen;