CN113729928B

CN113729928B - Ablation device

Info

Publication number: CN113729928B
Application number: CN202010479895.7A
Authority: CN
Inventors: 邱礼彪
Original assignee: Lifetech Scientific Shenzhen Co Ltd
Current assignee: Lifetech Scientific Shenzhen Co Ltd
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2023-03-07
Anticipated expiration: 2040-05-29
Also published as: CN113729928A

Abstract

The invention provides an ablation device, which comprises a catheter, a first electrode and a second electrode, wherein the first electrode is arranged outside the catheter, at least one first electrode needle is arranged on the first electrode, the second electrode is sleeved outside the catheter in a sliding manner, at least one second electrode needle is arranged on the second electrode, and the first electrode needle and the second electrode needle are arranged oppositely; one of the first electrode and the second electrode is connected with the positive pole of a power supply, the other of the first electrode and the second electrode is connected with the negative pole of the power supply, when the second electrode slides towards the first electrode, the first electrode needle and the second electrode needle are respectively switched from a retraction state to a deployment state, and the first electrode needle and the second electrode needle in the deployment state are arranged in a crossed mode. The ablation device can enable the ablation range to be more comprehensive and improve the ablation effect.

Description

Ablation device

Technical Field

The invention belongs to the technical field of medical instruments, and particularly relates to an ablation device.

Background

Radio Frequency Ablation (RFA) is to apply an Ablation electrode, perform percutaneous puncture under the guidance of ultrasound and CT, or in the process of surgery, use a thoracoscope to make the Radio Frequency electrode enter solid tumor tissue, then extend an electrode needle at the front end of the Ablation electrode needle, insert the electrode needle into the tumor tissue, enable tissue cells in a lesion area to vibrate and rub to generate heat through Radio Frequency output, enable the local temperature to reach above 90 ℃, kill the tumor tissue and the lesion tissue through the heated temperature, enable the tumor tissue and the lesion tissue to generate coagulation necrosis, finally form a liquefied focus or a fibrous tissue, and simultaneously adjust and monitor the temperature in real time, thereby achieving the purpose of locally eliminating the tumor tissue, and finally heat-melting a puncture needle channel to prevent tumor implantation.

A device that melts that is used for lung cancer to melt on the market at present contains a plurality of anchor form electrode needles of individual layer and solitary negative plate basically, wherein orientation unanimous of a plurality of anchor form electrode needles, the opposite side of human puncture position need be arranged in to the negative plate, the operation in-process, the scope of melting that a plurality of anchor form electrode needles of individual layer formed has the limitation, in the tissue that the electrode surrounds, the tissue of keeping away from the electrode melts the effect and just is not as close the electrode needle as, the negative plate pastes on human surface simultaneously, at the ablation in-process, the negative plate can generate heat, under the serious condition, can burn patient, influence the normal clear of operation.

Disclosure of Invention

The object of the present invention is to solve at least the problem that the ablation range of the electrode needle has limitation, and the object is achieved by the following means.

A first aspect of the invention proposes an ablation device comprising:

a conduit;

the first electrode is arranged outside the catheter, and at least one first electrode needle is arranged on the first electrode;

the second electrode is arranged outside the catheter in a sliding manner, the second electrode is closer to the near end of the catheter than the first electrode, at least one second electrode needle is arranged on the second electrode, and the first electrode needle and the second electrode needle are arranged oppositely;

one of the first electrode and the second electrode is connected with the positive pole of a power supply, the other one of the first electrode and the second electrode is connected with the negative pole of the power supply, when the second electrode slides towards the direction of the first electrode, the first electrode needle and the second electrode needle are respectively switched to the unfolding state from the retraction state, and the first electrode needle and the second electrode needle in the unfolding state are arranged in a crossed mode.

According to the ablation device, one of the first electrode and the second electrode is connected with the positive electrode of the power supply, the other of the first electrode and the second electrode is connected with the negative electrode of the power supply to form an electric loop, when a lesion part needs to be ablated, the second electrode slides towards the direction of the first electrode, the first electrode needle and the second electrode needle which are in the retraction state are respectively switched to the unfolding state, the first electrode needle and the second electrode needle which are in the unfolding state are respectively inserted into target tissues, and therefore the target tissues are ablated.

In addition, the ablation device according to the invention may have the following additional technical features:

in some embodiments of the invention, the ablation device further comprises a spacer slidably disposed on the exterior of the catheter, the spacer being positioned between the first electrode and the second electrode.

In some embodiments of the present invention, an end of the spacer adjacent to the first electrode is provided with at least one first guide groove, and at least one first electrode needle is at least partially arranged in the first guide groove; or/and one end of the spacer, which is close to the second electrode, is provided with at least one second guide groove, and at least one second electrode needle is at least partially arranged in the second guide groove.

In some embodiments of the invention, a projection of the first guide groove and a projection of the second guide groove are spaced apart on a cross section perpendicular to an axial direction of the spacer.

In some embodiments of the invention, the ablation device further comprises:

a first resilient member disposed outside of the conduit and between the first electrode and the spacer; or/and

a second resilient member disposed outside of the conduit, the second resilient member being disposed between the second electrode and the spacer.

In some embodiments of the invention, the ablation device further comprises:

a handle seat connected with the catheter;

and the brake assembly is arranged on the handle seat and is in transmission connection with the second electrode.

In some embodiments of the invention, the brake assembly comprises:

the rotating sleeve is sleeved outside the handle seat, and the inner surface of the rotating sleeve is provided with an internal thread;

the slider is arranged inside the handle seat, the slider is sleeved outside the catheter in a sliding mode and is connected with the near end of the second electrode, at least part of the slider extends out of the handle seat, and external threads matched and connected with the internal threads are arranged on the outer surface of the part, extending out of the handle seat, of the slider.

In some embodiments of the invention, the slider comprises:

the sliding seat is arranged outside the catheter in a sliding mode and is connected with the second electrode;

the handle seat is provided with an opening corresponding to the extension end.

In some embodiments of the present invention, the sliding seat is further provided with a wire slot penetrating through the sliding seat, the second electrode and the power supply are connected through a first wire, and the first wire is inserted into the wire slot.

In some embodiments of the present invention, the ablation device further includes a puncture element, the puncture element is connected to the distal end of the catheter, and is connected to the second electrode, a first threading hole is provided near the proximal end of the catheter, a second threading hole is provided on the puncture element, the puncture element and the power supply are connected by a second wire, the distal end of the second wire passes through the first threading hole, passes through the interior of the catheter, and is connected to the puncture element after passing through the second threading hole.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. Wherein:

FIG. 1 is a schematic view of a portion of an ablation device in accordance with an embodiment of the present invention, with the needle electrode in a retracted state;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic view of a portion of the ablation device of FIG. 1 with the electrode needle in a deployed configuration;

FIG. 4 is an enlarged view of the portion B in FIG. 3;

FIG. 5 is a partial structural view of the spacer of FIG. 2;

FIG. 6 is a schematic diagram of the end surface of the spacer near the first electrode in FIG. 5;

FIG. 7 is a schematic view of the end face structure of the spacer of FIG. 5 on the side close to the second electrode;

FIG. 8 is a schematic view of a portion of the first electrode of FIG. 2;

FIG. 9 is a schematic end view of the first electrode needle of FIG. 8 in a deployed state;

FIG. 10 is a schematic view of a portion of the second electrode shown in FIG. 2;

FIG. 11 is a schematic end view of the second electrode needle of FIG. 10 in a deployed state;

fig. 12 is a schematic end view of the first electrode needle and the second electrode needle in fig. 3 in a deployed state;

FIG. 13 is a schematic view of a portion of the puncturing member of FIG. 2;

FIG. 14 is a schematic view of a portion of the catheter of FIG. 2;

FIG. 15 isbase:Sub>A schematic cross-sectional view A-A of FIG. 3;

FIG. 16 is a partial schematic structural view of the handle seat of FIG. 3;

FIG. 17 is a cross-sectional view of B-B of the handle seat of FIG. 16;

FIG. 18 is a schematic view of a portion of the rotating sleeve of FIG. 3;

FIG. 19 is an enlarged view of the portion C of FIG. 3;

FIG. 20 is a cross-sectional view of the handle seat C-C of FIG. 16;

FIG. 21 is a schematic view of a portion of the slider of FIG. 3;

FIG. 22 is a cross-sectional view of the slider block D-D of FIG. 21;

fig. 23 is a schematic view of a portion of the injection fitting of fig. 3.

The reference numerals in the drawings denote the following:

100: an ablation device;

10: a conduit, 11: first threading hole, 12: a first through hole;

21: first electrode, 213: first electrode needle, 212: a first step surface;

22: second electrode, 223: second electrode needle, 222: a second step surface;

30: spacer, 31: first guide groove, 32: a second guide groove;

41: a first elastic member, 42; a second elastic member;

50: puncture piece, 51: second threading hole, 52: a second through hole;

60: handle seat, 61: mounting groove, 62: opening, 63: first mounting hole, 64: second mounting hole, 65: third mounting hole, 66: a fourth mounting hole;

70: brake assembly, 71: rotating sleeve, 711: internal thread, 72: slider, 721: a slider, 722: protruding end, 723: external thread, 724: fifth mounting hole, 725: sixth mounting hole, 726: a wire slot;

81: first conductive line, 82: a second conductive line;

90: injection joint, 91: spacing portion, 92: insertion portion, 93: connecting part, 94: hose, 95: and a power supply connector.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "at 8230; \8230; below" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

To more clearly describe the structure of the ablation electrode assembly and ablation device, the terms "proximal" and "distal" are defined herein as terms commonly used in the interventional medical field. Specifically, "distal" refers to the end of the surgical procedure that is distal from the operator, and "proximal" refers to the end of the surgical procedure that is proximal to the operator.

Referring to fig. 1, 2, 3 and 4, an ablation apparatus 100 in this embodiment includes a catheter 10, a first electrode 21 and a second electrode 22, the first electrode 21 is disposed outside the catheter 10, the second electrode 22 is closer to a proximal end of the catheter 10 than the first electrode 21, the first electrode 21 is provided with at least one first electrode needle 213, the second electrode 22 is slidably disposed outside the catheter 10, the second electrode 22 is provided with at least one second electrode needle 223, and the first electrode needle 213 and the second electrode needle 223 are disposed opposite to each other; one of the first electrode 21 and the second electrode 22 is connected with a positive pole of a power supply, the other of the first electrode 21 and the second electrode 22 is connected with a negative pole of the power supply, when the second electrode 22 slides towards the first electrode 21, the first electrode needle 213 and the second electrode needle 223 are respectively switched from a retracted state to an extended state, and the first electrode needle 213 and the second electrode needle 223 in the extended state are arranged in a crossed manner.

According to the ablation device 100 of the invention, one of the first electrode 21 and the second electrode 22 is connected with the positive pole of the power supply, and the other is connected with the negative pole of the power supply, so as to form an electric circuit, when a lesion part needs to be ablated, the second electrode 22 slides towards the direction of the first electrode 21, so that the first electrode needle 213 and the second electrode needle 223 in the retracted state are respectively switched to the expanded state, and the first electrode needle 213 and the second electrode needle 223 in the expanded state are respectively inserted into a target tissue, so as to ablate the target tissue, and meanwhile, as the first electrode needle 213 and the second electrode needle 223 are oppositely and crosswise arranged, a three-dimensional ablation range which is approximately spherical can be formed, so that the ablation range is more comprehensive, and the ablation range is reasonably adjusted according to lesion tissues with different shapes and sizes, so as to improve the ablation effect.

In the present embodiment, the first electrode 21 and the second electrode 22 both have a tubular structure, and the first electrode 21 and the second electrode 22 are respectively sleeved on the outside of the catheter 10. In other embodiments, at least one of the first electrode 21 and the second electrode 22 is a non-tubular structure surrounding at least a portion of the surface of the catheter 10, wherein the second electrode 22 is slidable on the surface of the catheter 10, in particular, a sliding track may be provided on the surface of the catheter 10, on which the second electrode 22 is slidable.

Referring to fig. 2 and 5, the ablation device 100 of the present embodiment further includes a spacer 30, the spacer 30 being slidably provided on the outside of the catheter 10, the spacer 30 being located between the first electrode 21 and the second electrode 22. In the present embodiment, the spacer 30 is disposed on the exterior of the conduit 10 in a tubular shape, in other embodiments, the spacer 30 may be a non-tubular structure surrounding at least a portion of the surface of the conduit 10, and the spacer 30 may slide on the surface of the conduit 10, specifically, a sliding track may be disposed on the surface of the conduit 10, and the spacer 30 may slide on the sliding track.

Referring to fig. 2 and 6, at least one first guide groove 31 is formed at one end of the spacer 30 adjacent to the first electrode 21, and at least one first electrode needle 213 is at least partially disposed in the first guide groove 31. Referring to fig. 2 and 7, at least one second guide groove 32 is formed at one end of the spacer 30 adjacent to the second electrode 22, and at least one second electrode needle 223 is at least partially disposed in the second guide groove 32. In the description, the first electrode needle 213 is at least partially disposed in the first guide groove 31, it is understood that the distal end of the first electrode needle 213 may not be in the first guide groove 31, or the first electrode needle 213 is entirely disposed in the first guide groove 31; the second electrode needle 223 is at least partially disposed in the second guide groove 32, and it is understood that the distal end of the second electrode needle 223 may not be in the second guide groove 32, or the second electrode needle 223 is entirely located in the second guide groove 32. In the present embodiment, the spacer 30 may be provided with at least one of the first guide groove 31 and the second guide groove 32.

The spacer 30 is made of a non-conductive medical ceramic material, and functions to separate the first electrode 21 from the second electrode 22 and to connect the first electrode 21 and the second electrode 22 to the positive electrode and the negative electrode of the power supply, respectively. The spacer 30 includes a first guide groove 31 provided on the distal end side and a second guide groove 32 provided on the proximal end side, and the number of guide grooves on both sides corresponds to the number of electrode needles on both sides. In a cross section perpendicular to the axial direction of the spacer 30, the projection of the first guide groove 31 and the projection of the second guide groove 32 are disposed at an interval such that the expanded first electrode needle 213 and the second electrode needle 223 are disposed to intersect. In the present embodiment, referring to fig. 6 and 7, the bottom surfaces of the first and

second guide grooves

31 and 32 are arc-shaped surfaces so as to facilitate the sliding of the first and second electrode needles 213 and 223 along the grooves.

Referring to fig. 2 and 4, the ablation device 100 of the present embodiment further includes a first elastic member 41 and a second elastic member 42, the first elastic member 41 and the second elastic member 42 are disposed on the catheter 10, the first elastic member 41 is disposed between the first electrode 21 and the spacer 30, and the second elastic member 42 is disposed between the second electrode 22 and the spacer 30. In this embodiment, the first elastic member 41 and the second elastic member 42 are both cylindrical springs, and the cylindrical springs are sleeved on the guide tube 10. In other embodiments, at least one of the first elastic member 41 and the second elastic member 42 may be an elastic member such as a leaf spring, an elastic wire, or a non-cylindrical spring, or the first elastic member 41 and the second elastic member 42 are not provided.

When the second electrode 22 moves toward the first electrode 21, the second electrode 22 presses the second elastic member 42 to deform, further presses the first elastic member 41 to deform through the spacer 30, finally changes the first electrode needle 213 and the second electrode needle 223 from the contracted state to the expanded state in the state that the first elastic member 41 and the second elastic member 42 are both compressed, and inserts into the target tissue for ablating the target tissue. After the ablation process is finished, the second electrode 22 moves in a direction away from the first electrode 21, the first elastic member 41 and the second elastic member 42 are restored to the original positions by the elastic force of the first elastic member and the second elastic member, and the first electrode 21 and the second electrode 22 are restored to the retracted positions from the deployed positions, so that the ablation device 100 is withdrawn from the human tissue and is ready for the next ablation process. In this embodiment, the first elastic member 41 and the second elastic member 42 are made of standard medical materials, and the structure thereof is not specific, and will not be described herein again.

Referring to fig. 8, in the present embodiment, the end of the first electrode 21 is connected to the first electrode needle 213, wherein the outer surface of the first electrode 21 is smoothly connected to the outer surface of the first electrode needle 213, and the connection between the inner surface of the first electrode needle 213 and the inner surface of the first electrode 21 forms the first step surface 212, so that the first elastic member 41 can be positioned by the first step surface 212 when the first elastic member 41 is disposed between the spacer 30 and the first electrode 21. The free end position of the first electrode needle 213 is further provided with a pointed structure so as to facilitate the insertion of the first electrode needle 213 into the target tissue for ablation. In this embodiment, referring to fig. 9, the first electrode 21 is provided with four first electrode needles 213 uniformly spaced along the circumferential direction of the first electrode 21, and the four first electrode needles 213 are distributed along the vertical direction and the horizontal direction in fig. 12, respectively. Correspondingly, in conjunction with fig. 6, the number of the first guide grooves 31 is also four, and are distributed at corresponding positions in the vertical and horizontal directions on the cross section of the spacer 30 to correspond to the four first electrode needles 213, respectively.

Referring to fig. 10, in the present embodiment, the end of the second electrode 22 is connected to the second electrode pin 223, wherein the outer surface of the second electrode 22 is smoothly connected to the outer surface of the second electrode pin 223, and a second step surface 222 is formed at the connection between the inner surface of the second electrode pin 223 and the inner surface of the second electrode 22, so that the second elastic member 42 can be positioned by the second step surface 222 when the second elastic member 42 is disposed between the spacer 30 and the second electrode 22. The free end position of the second electrode needle 223 is also provided with a pointed structure so as to facilitate the insertion of the second electrode needle 223 into the target tissue for ablation. In this embodiment, referring to fig. 11, the second electrode 22 includes four second electrode pins 223 uniformly spaced along the circumferential direction of the second electrode 22, and the four second electrode pins 223 are respectively disposed at an angle of 45 ° with respect to the horizontal direction. Correspondingly, referring to fig. 7, the number of the second guide grooves 32 is also four, and four second guide grooves 32 are also respectively disposed at an angle of 45 ° from the horizontal on the cross section of the spacer 30 to correspond to four second electrode needles 223, respectively.

The first electrode needle 213 and the second electrode needle 223 can be at least partially disposed in the corresponding guide grooves, so that the electrode needles are hidden in the corresponding guide grooves during the transportation of the ablation device 100 in the human body, thereby preventing unnecessary damage to the human body. To further ensure the safety of the ablation device 100 during delivery within the body, during operation, the ablation device 100 is placed within the delivery sheath, the first electrode 21 and the second electrode 22 are delivered to the target tissue through the delivery sheath, and the tissue is ablated after the delivery sheath is withdrawn. In this embodiment, the first electrode needle 213 and the second electrode needle 223 are made of super-elastic nitinol, and PTFE or other insulating materials are attached to the exterior of the first electrode 21 and the second electrode 22, so as to prevent the occurrence of leakage and avoid unnecessary damage to the health tissue of the human body.

In other embodiments of the present invention, the number of the first electrode needle 213 and the second electrode needle 223 is not limited to four, and other numbers may be provided. The first electrode needle 213 and the second electrode needle 223 are made of super elastic nickel titanium, the first electrode needle 213 and the second electrode needle 223 are easily switched from the retracted state (the state hidden in the guide groove) to the deployed state, and further, cutting textures may be provided on the first electrode needle 213 and the second electrode needle 223, thereby enhancing the deformability thereof.

Referring to fig. 2 and 13, the puncturing element 50 of this embodiment is made of stainless steel or nickel titanium for medical use, and has a sharp tip at its distal end to puncture the skin and target tissue. The puncture piece 50 is provided with a second threading hole 51, a second lead 82 (see fig. 1) can pass through the second threading hole 51 and be connected with the puncture piece 50, so that the power supply is in conductive communication with the puncture piece 50 and the first electrode 21 through the second lead 82, and meanwhile, the temperature sensor can also pass through the second threading hole 51 to be used for detecting heat generated in the ablation process. The distal end of the second wire 82 is connected to the temperature sensor and is also fixed to the tip of the piercing member 50, and the current passes through the second wire 82 to reach the temperature sensor, then passes through the temperature sensor to reach the piercing member 50 and the first electrode 21, and then enters the integrated circuit, so that the conditions of both conduction and transmission of temperature change are realized. The interior of the piercing member 50 is also provided with a second through-hole 52 for the exit of liquid. In the present embodiment, the puncture element 50 is provided to facilitate the ablation apparatus 100 to puncture the skin and the target tissue, and in other embodiments of the present invention, the structure of the puncture element 50 may be eliminated, the second lead 82 is directly connected to the first electrode 21, and after the target tissue is punctured by the medical puncture needle, the puncture needle is withdrawn from the body, and then the ablation apparatus 100 is sent to the target tissue in the body.

Fig. 14 is a schematic view of a portion of the catheter of fig. 2. Referring to fig. 2 and 14, the catheter 10 is made of medical stainless steel and has an insulating layer attached to its outer surface. The proximal end of the catheter 10 is provided with a first threading hole 11 for the second wire 82 and the temperature sensor to pass through, and the interior of the catheter 10 is also provided with a first through hole 12 for the passage of the liquid and the second wire 82. One end of the second wire 82 passes through the second threading hole 51 and then is connected to the piercing member 50, and the other end of the second wire 82 passes through the first threading hole 11 via the first through hole 12 inside the catheter 10 and is connected to the power supply, thereby effectively protecting the second wire 82 and the temperature sensor.

With reference to fig. 2 and 3, the specific assembly process of the above structure is as follows: according to the direction from the proximal end to the distal end, the second electrode 22 is sleeved on the outer surface of the catheter 10, then the second elastic member 42 is sleeved on the catheter 10, then the spacing member 30 is sleeved on the catheter 10, then the first elastic member 41 is sleeved, then the first electrode 21 is sleeved on the catheter 10, the distal end face of the first electrode 21 is ensured to be flush with and fixed to the distal end face of the catheter 10, and finally the proximal end of the puncturing member 50 is fixed to the first electrode 21 and the distal end of the catheter 10, wherein the fixing mode can be welding and the like. Then, the distal end of the first elastic member 41 is fixed to the first step surface 212 of the first electrode 21, the proximal end of the first elastic member 41 is fixed to the distal end of the spacer 30, and the first elastic member 41 is in an unstressed state, at this time, the plurality of first electrode pins 213 of the first electrode 21 respectively correspond to the first guide grooves 31 of the spacer 30, and the first electrode pins 213 may be completely disposed in the first guide grooves 31 or partially disposed in the first guide grooves 31. The distal end of the second elastic element 42 is fixed to the spacer 30, the proximal end of the second elastic element 42 is fixed to the second step surface 222 of the second electrode 22, and the second elastic element 42 is in an unstressed state, the plurality of second electrode pins 223 of the second electrode 22 are respectively matched and corresponding to the second guide grooves 32 of the spacer 30, and the second electrode pins 223 may be completely disposed in the second guide grooves 32 or partially disposed in the second guide grooves 32. The temperature sensor and one end of the second wire 82 pass through the second threading hole 51 and are fixed at the tip of the piercing member 50, and then pass through the first threading hole 11 through the second through hole 52 of the piercing member 50 and the first through hole 12 in the catheter 10, and then are connected to the positive electrode of the power supply. At this time, the entire puncture element 50 and the first electrode 21 are charged positive electrodes. The proximal end of the second electrode 22 is connected with a first lead 81, and is connected with the negative pole of the power supply through the first lead 81, so that the second electrode 22 is a charged negative pole, and the first electrode 21 and the second electrode 22 form an electric loop.

Referring to fig. 3, 15 and 16, the ablation device 100 of the present embodiment further includes a handle holder 60 and a brake assembly 70, wherein the brake assembly 70 is disposed on the handle holder 60, and the brake assembly 70 is connected to the second electrode 22. The movement of the second electrode 22 can be controlled by controlling the brake assembly 70 on the handle holder 60, so that the first electrode needle 213 and the second electrode needle 223 complete the switching process between the retracted state and the deployed state, and the handle holder 60 in this embodiment is made of medical plastics and the like.

In one embodiment, the handle mount 60 and brake assembly 70 may be eliminated, the simplest being to manually control the movement of the second electrode 22 directly proximally. It will be appreciated that the brake assembly 70 may be a rotating sleeve and slider that cooperate to control the movement of the second electrode 22; the sliding block and the sliding rail can be matched, specifically, the sliding block is directly stirred to drive the second electrode 22 to move, and the like.

Referring to fig. 3 and 15, the brake assembly 70 in this embodiment includes a rotating sleeve 71 and a slider 72. Referring to fig. 16 and 17, the handle holder 60 is provided at an outer portion thereof with a mounting groove 61 for receiving a rotation sleeve 71, and the rotation sleeve 71 is fitted in the mounting groove 61 of the handle holder 60. In fig. 18, the inner surface of the rotating sleeve 71 is provided with an internal thread 711. Referring to fig. 19, the sliding block 72 is slidably disposed on the outer surface of the catheter 10 and connected to the proximal end of the second electrode 22, the sliding block 72 is disposed inside the handle holder 60, at least a portion of the sliding block 72 extends out of the handle holder 60, and an external thread 723 (see fig. 21) is disposed on the outer surface of the portion of the sliding block 72 extending out of the handle holder 60 and is in matching connection with the internal thread 711. Referring to fig. 16 and 20, a first mounting hole 63 and a second mounting hole 64 are formed in the handle holder 60, and the proximal end of the catheter 10 sequentially passes through the first mounting hole 63 and the second mounting hole 64 and is supported and fixed by the first mounting hole 63 and the second mounting hole 64. The rotating sleeve 71 is rotated to drive the sliding block 72 to move axially, so that the second electrode 22 is driven to move, the first electrode needle 213 and the second electrode needle 223 are unfolded or retracted, the position relation between the first electrode needle 213 and the second electrode needle 223 can be controlled, and accordingly lesion tissues in different forms and different ranges can be ablated. Specifically, for example, if the range of the target tissue to be ablated is large, when the rotating sleeve 71 is rotated clockwise, the sliding block 72 is driven to move in the distal direction, so as to push the second electrode 22 in the distal direction, and thus the second electrode 22 and the first electrode 21 are close to each other; if the range of the target tissue to be ablated is large, the rotating sleeve 71 is rotated counterclockwise to drive the sliding block 72 to move in the proximal direction, so as to push the second electrode 22 in the proximal direction, and thus the second electrode 22 and the first electrode 21 are away from each other. The rotary sleeve 71 and the slider 72 in this embodiment are both made of medical plastics or the like.

As shown in fig. 21, the slider 72 in the present embodiment includes a slider 721 and a protruding end 722. Referring again to FIG. 19, a sliding seat 721 is slidably disposed on the exterior of the catheter 10 and is connected to the proximal end of the second electrode 22. In fig. 21, two opposite sides of the outer surface of the sliding seat 721 are respectively provided with two extending ends 722, the end surface of the extending end 722 is provided with an external thread 723 in matching connection with the internal thread 711, and in combination with fig. 17, the handle seat 60 is provided with an opening 62 corresponding to the extending end 722. The opening 62 ensures that the extending end 722 is engaged with and drivingly connected to the rotating sleeve 71, and the opening 62 also serves as a limit for the extending end 722 to prevent the slider 72 from rotating during sliding along the catheter 10. In this embodiment, the sliding seat 721 is a hollow structure, and the sliding block 72 can be sleeved outside the catheter 10, in other embodiments, the sliding seat 721 may not include a hollow structure, and may surround part of the outside of the catheter 10, and a rail may be disposed outside the catheter 10, and the sliding seat 721 slides on the rail.

Referring to fig. 21 and 22, a fifth mounting hole 724 is formed at a center of the sliding seat 721 in the present embodiment, and the guide tube 10 is inserted into the fifth mounting hole 724. The sliding seat 721 is further provided with a wire groove 726 for the first wire 81 to pass through, and for convenience of processing, the wire groove 726 in this embodiment is communicated with the fifth mounting hole 724. In order to facilitate the connection of the second electrode 22 with the slider 71, a sixth mounting hole 725 is further formed on a side of the slider 71 facing the second electrode 22, and the diameter of the sixth mounting hole 725 is larger than the radial dimensions of the fifth mounting hole 724 and the second electrode 22 of the second electrode 22, so that the second electrode 22 is inserted into the sixth mounting hole 725, and the slider 72 is connected with the second electrode 22 in a driving manner.

Referring again to fig. 3, 16 and 23, the ablation device 100 of this embodiment further includes an injection connector 90, a flexible tube 94 and a power connector 95. The handle base 60 is provided with a third mounting hole 65 and a fourth mounting hole 66, and the power connector 95 is inserted into the third mounting hole 65 and communicated with a power supply for supplying power to the first electrode 21 and the second electrode 22. The injection joint 90 includes a stopper 91, a plug 92, and a connector 93. Wherein the insertion part 92 is inserted into the fourth mounting hole 66, connected to the proximal end of the catheter 10 by the flexible tube 94, and limits the insertion depth of the injection connector 90 by the stopper 91. The outer surface of the connecting part 93 is provided with a thread-shaped structure for connecting with an external infusion device, so that the target tissue is infused through the hose 94 and the catheter 10, on one hand, because the target tissue is easy to carbonize in the ablation process, the electrical conductivity is poor, the infusion can provide a conductive medium for the target tissue, the conduction is convenient, on the other hand, the pain of a patient in the ablation process can be relieved by injecting pain relieving medicines into the human body.

While the invention has been described with reference to specific preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An ablation device, comprising:

a conduit;

the second electrode is arranged outside the catheter in a sliding mode, the second electrode is closer to the near end of the catheter than the first electrode, at least one second electrode needle is arranged on the second electrode, and the first electrode needle and the second electrode needle are arranged oppositely;

2. The ablation device of claim 1, further comprising a spacer slidably disposed on an exterior of the catheter, the spacer being positioned between the first electrode and the second electrode.

3. The ablation device of claim 2,

one end of the spacer, which is close to the first electrode, is provided with at least one first guide groove, and at least one first electrode needle is at least partially arranged in the first guide groove; or/and

one end of the spacer, which is close to the second electrode, is provided with at least one second guide groove, and at least one second electrode needle is at least partially arranged in the second guide groove.

4. The ablation device of claim 3, wherein a projection of the first guide slot and a projection of the second guide slot are spaced apart in a cross section perpendicular to an axial direction of the spacer.

5. The ablation device of claim 2, further comprising:

a second resilient member disposed outside of the conduit, the second resilient member disposed between the second electrode and the spacer.

6. The ablation device of claim 1, further comprising:

a handle seat connected with the catheter;

and the brake assembly is arranged on the handle seat and is connected with the second electrode.

7. The ablation device of claim 6, wherein the brake assembly comprises:

the slider is arranged inside the handle seat, the slider is arranged outside the catheter in a sliding mode and is connected with the second electrode, at least part of the slider extends out of the handle seat, and external threads matched and connected with the internal threads are arranged on the outer surface of the part, extending out of the handle seat, of the slider.

8. The ablation device of claim 7, wherein the slider comprises:

the handle seat is provided with an opening corresponding to the extension end.

9. The ablation device of claim 8, wherein a wire slot is further formed in the slider and extends through the slider, the second electrode is connected to the power source through a first wire, and the first wire is inserted into the wire slot.

10. The ablation device of any one of claims 1 to 9, further comprising a puncture member connected to the distal end of the catheter and connected to the second electrode, wherein a first threading hole is provided near the proximal end of the catheter, a second threading hole is provided on the puncture member, the puncture member and the power source are connected by a second wire, and the distal end of the second wire passes through the first threading hole, passes through the interior of the catheter, passes through the second threading hole, and is connected to the puncture member.