Ablation handle and ablation catheter

Abstract

The utility model belongs to the field of medical instrument ablation, and provides an ablation handle and an ablation catheter.The ablation handle comprises a shell, a transmission assembly and a push rod, and the near end of the transmission assembly is connected with the shell; wherein the transmission assembly comprises a first movable rack, a gear assembly and a second movable rack, the first movable rack is movably arranged in the shell and meshed with the gear assembly, one end of the first movable rack is connected with one end of the push rod, and the second movable rack is movably arranged in the shell and meshed with the gear assembly. By arranging the gear assembly, the stroke of the second movable rack is larger than that of the first movable rack, so that the ablation electrode connected with the second movable rack is driven to rapidly expand or contract, the control sensitivity of the ablation electrode is improved, and opening and closing of the ablation electrode are accurately controlled.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical device ablation, and particularly relates to an ablation handle and an ablation catheter. Background Art

[0002] Pulsed electric field is a kind of ablation with non-thermal energy, which causes less damage to healthy tissues. In addition, pulsed electric field ablation also has selectivity for cells and tissues. Pulsed electric field ablation has a threshold, and can selectively ablate diseased tissues during the ablation process, which is a kind of airway ablation treatment method with both safety and effectiveness.

[0003] Existing pulsed ablation usually requires holding the mirror with one hand, which has higher requirements for the single-handed controllability of consumables. Currently, most of them are methods such as single-handed turning of the wheel, single-handed pushing of the slider, two-handed pushing or pulling back, etc. Currently, manual control is often used to open and recycle the electrodes, and it cannot be quickly and efficiently used in combination with other new devices (such as robots, etc.). When using a robot to operate the instrument panel, there is still a need to operate the consumables to open and recycle. In some surgeries, such as bronchial rheoplasty, the number of times of releasing and recycling the consumables in each surgery is as high as 170 times. This increases the operation time and complexity between the instrument panel and the consumables, and is prone to operation errors. While using two people to operate simultaneously increases the personnel cost and may cause damage to the patient's cavity due to non-recycling during movement. Content of the Utility Model

[0004] The utility model provides an ablation handle to solve the technical problems existing in the above technical background, so as to facilitate the operation of ablation surgery by surgical staff. Another aspect of the utility model lies in providing an ablation catheter.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical scheme:

[0006] An ablation handle, comprising:

[0007] A housing, a transmission assembly and a push rod. The transmission assembly is arranged in the housing. One end of the push rod passes through the housing and is connected to the transmission assembly. The push rod can make a reciprocating linear movement relative to the housing. The other end of the traction wire is connected to the transmission assembly. The proximal end of the delivery is connected to the housing;

[0008] The transmission assembly includes a first moving rack, a gear assembly and a second moving rack. The first moving rack is movably arranged in the housing and meshes with the gear assembly. One end of the first moving rack is connected to one end of the push rod. The second moving rack is movably arranged in the housing and meshes with the gear assembly. One end of the traction wire is connected to the end of the second moving rack far from the push rod. By setting the gear assembly, the stroke of the second moving rack is made greater than the stroke of the first moving rack.

[0009] In some embodiments, the gear assembly includes a first driving gear, a second driven large gear, and a second driven small gear. Among them, the first driving gear is rotatably arranged in the housing and meshes with the first moving rack. The second driven large gear and the second driven small gear are coaxially and fixedly connected and rotatably arranged in the housing. The second driven small gear meshes with the first driving gear, and the second driven large gear meshes with the second moving rack. Among them, the outer diameter of the second driven small gear is smaller than the outer diameter of the second driven large gear, and the outer diameter of the first driving gear is larger than the outer diameter of the second driven small gear.

[0010] In some embodiments, the ratio of the outer diameter of the second driven large gear to the outer diameter of the second driven small gear ranges from 1:1.1 to 1:5.

[0011] In some embodiments, a first limiting structure is provided between the housing and the first moving rack on the housing, so that the first moving rack can perform reciprocating linear movement. The first limiting structure includes a first limiting groove provided on the housing and a first limiting protrusion provided on the first moving rack, or a first limiting protrusion provided on the housing and a first limiting groove provided on the first moving rack. The first limiting protrusion is movably clamped in the first limiting groove.

[0012] In some embodiments, a first through hole is provided on the housing, a first bracket is provided in the housing, and a first support hole is provided on the first bracket. The first through hole, the first support hole, and the push rod are coaxially arranged. One end of the push rod passes through the first through hole and the first support hole and is connected to the first moving rack.

[0013] In some embodiments, a first limiting block is provided on one side of the push rod close to the first through hole, and the outer diameter of the first limiting block is larger than the inner diameter of the first through hole.

[0014] In some embodiments, a return spring is provided between the first limiting block and the first bracket. One end of the return spring abuts against the first bracket, and the other end of the return spring abuts against the first limiting block. In the initial state, the return spring is in a natural state or a compressed state.

[0015] In some embodiments, a second limiting structure is provided between the housing and the second moving rack. The second limiting structure is used for the second moving rack to perform reciprocating linear movement. The second limiting structure includes a second limiting groove provided on the housing and a second limiting boss provided on the second moving rack, or a second limiting boss provided on the housing and a second limiting groove provided on the second moving rack. The second limiting boss is movably clamped in the second limiting groove.

[0016] In some embodiments, the first limiting structure is provided on the side of the first moving rack away from the second moving rack, and the second limiting structure is provided on the side of the second moving rack away from the first moving rack. One side of the first moving rack abuts against one side of the first limiting groove, and one side of the second moving rack abuts against one side of the second limiting groove.

[0017] In some embodiments, the first moving rack is provided with a first abutting surface, and the second moving rack is provided with a second abutting surface. The first abutting surface and the second abutting surface abut against each other.

[0018] In some embodiments, a first limiting plate is provided in the housing. The upper end surfaces of the first moving rack and the second moving rack both abut against the first limiting plate.

[0019] In some embodiments, a locking mechanism is further included. The locking mechanism is used to maintain the current expanded state of the ablation electrode.

[0020] In some embodiments, the locking mechanism includes a locking pawl, a locking pawl lever, and a tension spring. The locking pawl is rotatably provided on the housing. One end of the locking pawl lever passes through the housing and abuts against the locking pawl. One end of the tension spring is connected to the locking pawl lever, and the other end thereof is connected to the housing. In the initial state, the locking pawl abuts against a tooth groove of the transmission assembly. When the push rod is pushed, the locking pawl can move into the next adjacent tooth groove under the action of the tension spring.

[0021] In some embodiments, a locking limit block is provided on the locking pawl lever. In the initial state, the locking limit block abuts against the inner wall of the housing.

[0022] In some embodiments, when the number of ablation electrodes is greater than or equal to two, a first connecting member is provided between two adjacent ablation electrodes for connection. The first connecting member is movably sleeved on the traction wire.

[0023] In some embodiments, the first connecting member and the two ablation electrodes connected to both ends of the first connecting member are of an integral structure. The first connecting member is made of a conductive material so that multiple ablation electrodes form a monopolar ablation structure.

[0024] In some embodiments, the first connecting member is made of an insulating material, and any two of the plurality of ablation electrodes can be correspondingly connected to the positive electrode wire and the negative electrode wire so that the two ablation electrodes form a bipolar ablation structure, or at least one of the plurality of ablation electrodes can be energized to form a monopolar ablation structure.

[0025] In some embodiments, a scale mark is provided on one side of the delivery sheath near the ablation electrode, and the scale marks are evenly distributed from the distal end to the proximal end of the delivery sheath.

[0026] In some embodiments, the ablation electrode is a basket weaving structure.

[0027] In some embodiments, in the initial state, the outer diameter of the contour of the ablation electrode ranges from 0.2 to 4 mm, and in the expanded state, the expanded outer diameter of the ablation electrode is 1 to 60 mm.

[0028] In some embodiments, a guiding tip is provided at one end of the traction wire close to the ablation electrode, and one end of the ablation electrode is fixed to the guiding tip. Among them, a smooth guiding structure is provided at one end of the guiding tip away from the ablation electrode.

[0029] Compared with the prior art, the beneficial effects brought by the present utility model are:

[0030] In this application, by arranging a gear assembly inside the housing, which meshes with the first moving rack and the second moving rack respectively, the moving directions of the first moving rack and the second moving rack are changed. At the same time, by setting the reduction ratio of the gear assembly, when the push rod drives the first moving rack to move, after the second moving rack is driven by the gear assembly, it can move at a faster moving speed, thereby driving the traction wire to move quickly, and further driving the ablation electrode to expand or contract quickly, with sensitive control and fast reaction speed, which is convenient for operation and adjustment during the surgical process.

[0031] Additional aspects and advantages of the present application will be given in part in the following description, which will become apparent from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a perspective view of an ablation catheter of the present utility model;

[0033] Figure 2 is a schematic diagram of the expanded state of the ablation electrode of an ablation catheter of the present utility model;

[0034] Figure 3 is a schematic diagram of the internal structure of an ablation handle of the present utility model;

[0035] Figure 4 The first three-dimensional view of the transmission component of an ablation handle of the present utility model;

[0036] Figure 5 The second three-dimensional view of the transmission component of an ablation handle of the present utility model;

[0037] Figure 6 The structural schematic diagram of a housing of an ablation handle of the present utility model;

[0038] Figure 7 The structural schematic diagram of another housing of an ablation handle of the present utility model;

[0039] Figure 8 The front view of the internal structure of an ablation handle of the present utility model;

[0040] Figure 9 is Figure 8 the enlarged view in

[0041] Figure 10 The structural schematic diagram of an ablation catheter of the present utility model applied to an endoscope;

[0042] Figure 11 The structural schematic diagram of multiple ablation electrodes of an ablation catheter of the present utility model;

[0043] Figure 12 The schematic diagram of the scale mark at the distal end of the delivery sheath of an ablation catheter of the present utility model. Specific embodiments

[0044] The following further describes the present application in detail with reference to specific drawings. In the description of this embodiment, unless otherwise specified, the orientation or positional relationship indicated by terms such as "left" and "right" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the present application must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0045] As Figure 1-2 shown, an ablation catheter provided by the present utility model mainly includes a delivery sheath 200, a traction wire 300, ablation electrodes 201, and an ablation handle 100.

[0046] The delivery sheath 200 is provided with a through first channel; and has a certain degree of directivity and flexibility to adapt to various bent body cavities. Specifically, in this embodiment, the delivery sheath 200 is composed of multiple layers of composite materials. The outer layer is composed of a polymer material with good biocompatibility and has multiple segments of hardness. The proximal end close to the ablation handle 100 has good pushability and high hardness characteristics, which can be PA6, PA12, block polyamide or other polymer materials. The distal end close to the ablation electrode 201 has flexibility and low hardness characteristics, which can be block polyamide, polyamide or other polymer materials.

[0047] The intermediate layer is composed of a metal wire reinforcement layer, which can be a braided layer, a coil layer or a combination thereof. Further, the braided layer has different braiding densities. A low-density braiding is selected for the proximal end close to the ablation handle 100 to enhance pushability, and a high-density braiding is selected for the distal end close to the ablation electrode 201 to enhance flexibility. The material of the intermediate layer can be sus304, sus316 or Ni-Ti, etc.

[0048] Further, the inner layer is composed of a polymer material with good lubricity and low frictional resistance to reduce the resistance when the traction wire moves in the first channel of the delivery sheath 200. Optionally, the inner layer material can be HDPE, PTFE, FEP or other polymer materials with low friction coefficients.

[0049] Further, an insulating layer is also provided on the delivery sheath 200. By setting the insulating layer, during the process of the ablation energy being transmitted from the power supply connector to the ablation electrode 201, current leakage and ablation energy loss can be prevented in the delivery sheath 200. The ablation energy is only released at the ablation electrode, avoiding ablation energy loss and achieving the purpose of precise ablation.

[0050] The traction wire 300 is movably disposed in the first channel of the delivery sheath 200, and the traction wire 300 can move axially relative to the delivery sheath 200;

[0051] The ablation electrode 201 is disposed at the distal end of the delivery sheath 200. The ablation electrode 201 is a expandable structure and is adaptively matched and attached to the human body cavity. In this embodiment, the human body cavity includes but is not limited to the airway, intestine or blood vessel, etc. The ablation electrode 201 can be configured with ablation energy. In this embodiment, the distal end of the delivery sheath 200 is the end far from the ablation handle 100. The ablation electrode 201 is provided with a first end and a second end. One end of the first end of the ablation electrode 201 is connected to the traction wire 300, and the second end of the ablation electrode 201 is connected to the distal end of the delivery sheath 200. By driving the first end of the ablation electrode 201 close to the second end through the traction wire 300, the ablation electrode 201 is expanded, so that the ablation electrode 201 abuts against the inner wall of the human body cavity;

[0052] Such as Figure 3As shown, the ablation handle 100 includes a housing, a transmission assembly, and a push rod 101. The transmission assembly is disposed within the housing. One end of the push rod 101 passes through the housing and is connected to the transmission assembly. The push rod 101 is capable of reciprocating linear movement relative to the housing. The other end of the traction wire 300 is connected to the transmission assembly. The proximal end of the delivery sheath 200 is connected to the housing.

[0053] Specifically, as Figure 3-5 shown, the transmission assembly includes a first moving rack 103, a gear assembly, and a second moving rack 107. The first moving rack 103 is movably disposed within the housing and meshes with the gear assembly. One end of the first moving rack 103 is connected to one end of the push rod 101. The second moving rack 107 is movably disposed within the housing and meshes with the gear assembly. Moreover, the moving directions of the first moving rack 103 and the second moving rack 107 are opposite, making the entire ablation handle structure smaller in volume and more compact. One end of the traction wire 300 is connected to the end of the second moving rack 107 away from the push rod 101. By providing the gear assembly, the stroke of the second moving rack 107 is made greater than the stroke of the first moving rack 103.

[0054] In this application, by providing the gear assembly, the output speed of the second moving rack is changed. The output speed of the first moving rack 103 is increased through the gear assembly. Thus, when the second moving rack 107 moves, it moves at a speed greater than that of the first moving rack 103, realizing the rapid movement of the traction wire 300. As a result, the first end and the second end of the ablation electrode 201 quickly approach or move away from each other, performing rapid expansion or rapid contraction, and improving the control sensitivity of the surgical personnel to the ablation electrode 201. At the same time, it avoids the ablation electrode from contracting untimely and causing damage to the human body cavity.

[0055] In one embodiment, as described above, when the first moving rack 103 is driven to move by the push rod 102, through the transmission of the gear assembly, the moving stroke of the second moving rack 107 is greater than the moving stroke of the first moving rack 103.

[0056] Furthermore, the gear assembly includes a first driving gear 104, a second driven large gear 106, and a second driven small gear 105. Among them, the first driving gear 104 is rotatably disposed within the housing through a hole - shaft structure, and the first driving gear 104 meshes with the first moving rack 103. The second driven large gear 106 and the second driven small gear 105 are coaxially disposed and fixedly connected to each other, thus rotating synchronously. The second driven large gear 106 and the second driven small gear 105 are rotatably disposed within the housing through a hole - shaft. The second driven small gear 105 meshes with the first driving gear 104, and the second driven large gear 106 meshes with the second moving rack 107. Among them, the outer diameter of the second driven small gear 105 is smaller than the outer diameter of the second driven large gear 106, and the outer diameter of the first driving gear 104 is greater than the outer diameter of the second driven small gear 105.

[0057] Specifically, since the second driven large gear 106 and the second driven small gear 105 are coaxially and relatively fixedly arranged, they have the same angular velocity. Therefore, the second driven large gear 106 with a larger outer diameter has a larger linear velocity. At the same time, since the first moving rack 103 meshes with the first driving gear 104, and the first driving gear 104 meshes with the second driven small gear 105, the first driving gear 104 and the second driven small gear 105 have the same linear velocity. When the first driving gear 104 rotates one circle, the second driven small gear 105 can rotate more than one circle, so that the second moving rack 107 moves faster than the first moving rack 103.

[0058] Optionally, the first driving gear 104 and the second driven small gear 105 can also be coaxially arranged and fixedly connected therebetween. At this time, the outer diameter of the first driving gear 104 is smaller than that of the second driven small gear 105, the outer diameter of the second driven large gear 106 is smaller than or equal to the outer diameter of the second driven small gear 105, and the second driven large gear 106 meshes with the second driven small gear 105 and the second moving rack 107 respectively, and the above-mentioned speed increasing effect can also be achieved.

[0059] Furthermore, the ratio range of the outer diameter of the second driven large gear 106 to the outer diameter of the second driven small gear 105 is 1:1.1 to 1:5.

[0060] In one embodiment, as Figure 4 and Figure 7 shown, a first limiting structure is provided between the first moving rack 103 and the housing, so that the first moving rack 103 can perform reciprocating linear motion. Specifically, the first limiting structure includes a first limiting groove 1014 provided on the housing and a first limiting boss 1031 provided on the first moving rack 103. In this embodiment, the first limiting groove 1014 is composed of two baffles. The baffles are horizontally arranged and are consistent with the moving direction of the push rod 101. The two baffles are arranged at a certain distance to form the first limiting groove 1014. The thickness of the first limiting boss 1031 matches the distance between the two baffles, so that the first limiting boss 1031 on the first moving rack 103 is clamped in the first limiting groove 1014.

[0061] Optionally, the first limiting boss 1031 can also be provided on the housing and the first limiting groove 1014 can be provided on the first moving rack 103, and the above-mentioned effect can also be achieved.

[0062] In one embodiment, to make the push rod 101 move linearly, as Figure 6As shown in the figure, a first through hole 1012 is provided on the housing. A first bracket 108 is provided inside the housing. A first support hole 1081 is provided on the first bracket 108. The first through hole 1012, the first support hole 1081 and the push rod 101 are coaxially arranged. The outer shape of the push rod 101 is adapted to the sizes of the first support hole 1081 and the first through hole 1012. One end of the push rod 101 passes through the first through hole 1012 and the first support hole 1081 and is connected to the first moving rack 103.

[0063] Further, to prevent the push rod 101 from detaching from the housing, a first limit block 1011 is provided on the push rod 101. The first limit block 1011 is located inside the housing and is arranged on the side close to the first through hole 1012. The outer diameter profile of the first limit block 1011 is larger than the inner diameter of the first through hole 1012. In the limit position, the first limit block 1011 contacts the inner wall of the housing.

[0064] Further, to enable the push rod 101 to reset itself, a return spring 102 is provided between the first limit block 1011 and the first bracket 108. One end of the return spring 102 is connected to the first limit block 1011, and the other end thereof is connected to the first bracket 108. In the initial state, the return spring 1011 is in a natural state or a compressed state. When the push rod 101 moves, it drives the first limit block 1011 to compress the return spring 102, and the return spring 102 is compressed. When the hand is released, the push rod 101 is not controlled by an external force and resets under the elastic force of the return spring 102.

[0065] Optionally, the return spring 102 can also be replaced by an elastic structural member such as a spring plate.

[0066] In one embodiment, as Figure 5 and Figure 6 shown, in order to ensure that the second moving rack 107 makes a reciprocating linear movement, a second limit structure is provided between the housing and the second moving rack 107. The second limit structure includes a second limit groove 1013 provided on the housing and a second limit boss 1071 provided on the second moving rack 107. The second limit boss 1071 is adapted to the second limit groove 1013, and the second limit boss 1071 is movably clamped in the second limit groove 1013. Specifically, in this embodiment, the second limit groove 1013 is composed of two baffles, and its structural principle is the same as that of the first limit groove 1014, and will not be elaborated here too much.

[0067] Optionally, it can also be that the second limit boss 1071 is provided on the housing and the second limit groove 1013 is provided on the second moving rack 107, which can also achieve the above effect.

[0068] In one embodiment, as Figure 5 and Figure 6As shown in the figure, the first limiting structure is arranged on the side of the first moving rack 103 away from the second moving rack 107, and the second limiting structure is arranged on the side of the second moving rack 107 away from the first moving rack 103. One side of the first moving rack 103 abuts against one side of the first limiting groove 104, and the second moving rack 107 abuts against one side of the second limiting groove 1013. That is, the first limiting structure and the second limiting structure are arranged on two opposite sides of the housing, so that the movement of the first moving rack 103 and the second moving rack 107 is not interfered.

[0069] In one embodiment, to make the housing structure compact and the first moving rack 103 and the second moving rack 107 only make reciprocating linear movements, a first abutting surface 1032 is arranged on the first moving rack 103, and a second abutting surface 1072 is arranged on the second moving rack 107. Among them, the first abutting surface 1032 and the second abutting surface 1072 abut against each other. At the same time, one side of the first moving rack 103 abuts against the first limiting groove 1014, and one side of the second moving rack 107 abuts against the second limiting groove 1013, so as to limit the first moving rack 103 and the second moving rack 107. In this embodiment, both the first abutting surface 1032 and the second abutting surface 1072 are plane structures. Optionally, the first abutting surface 1032 and the second abutting surface 1072 can also be tangent structures, that is, the first abutting surface 1032 is an arc surface structure, the second abutting surface 1072 is a plane structure, or their structures are opposite, or both the first abutting surface 1032 and the second abutting surface 1072 are arc surface structures.

[0070] In one embodiment, as Figure 3 and Figure 8 shown, in order to prevent the first moving rack 103 and the second moving rack 107 from swinging up and down, a first limiting plate 109 is arranged on the housing. Among them, the upper end surfaces of the first moving rack 103 and the second moving rack 107 both abut against the first limiting plate 109. In this application, the contact surfaces of the first limiting plate 109 with the first moving rack 103 and the second moving rack 107 are both planes.

[0071] In one embodiment, as Figure 8 and Figure 9 shown, it further includes a locking mechanism 400, and the locking mechanism 400 is used to maintain the current expanded state of the ablation electrode 201.

[0072] Specifically, the locking mechanism 400 includes a locking pawl 402, a locking pawl 401, and a tension spring 403. The locking pawl 102 is rotatably arranged on the housing. One end of the locking pawl 401 passes through the housing and abuts against the locking pawl 402. One end of the tension spring 403 is connected to the locking pawl 402, and the other end is connected to the housing. In the initial state, the locking pawl 402 abuts against a tooth groove of the transmission assembly, and the push rod 101 can only move towards the housing side. When the push rod 101 is pushed, the locking pawl 402 can move into the next adjacent tooth groove under the action of the tension spring 403.

[0073] In this embodiment, the locking pawl 402 is movably clamped on the tooth groove of the first driving gear 104. As Figure 9 shown, since the locking pawl 401 abuts against and limits the position of the locking pawl 402, the first driving gear 104 cannot rotate towards the side close to the locking pawl 401, that is, it cannot rotate counterclockwise in the direction as Figure 8 shown. When the push rod 101 drives the first moving rack 103 to move, the first driving gear 104 rotates clockwise. The first driving gear 104 drives the locking pawl 402 to rotate towards the side away from the locking pawl 401, and at the same time stretches the tension spring 403. When the locking pawl 402 disengages from the current tooth groove, under the action of the tension spring 403, the locking pawl 402 is reset and thus clamped in the next tooth groove of the first driving gear 104 for locking.

[0074] Optionally, the tension spring 403 can also be arranged on the other side of the locking pawl 402, that is, when the first driving gear 104 drives the locking pawl 402 to rotate, the locking pawl 402 compresses the tension spring 403.

[0075] Further, a locking limit block 4011 is also provided on the locking pawl 401. In the initial state, the locking limit block 4011 abuts against the inner wall of the housing, thereby preventing the locking pawl 401 from exiting the housing. At the same time, it also supports the locking pawl 402 to fix the locking pawl 402 in the same appropriate position, that is, a part of the locking pawl 402 can be clamped in the tooth groove of the first driving gear 104.

[0076] Optionally, the locking mechanism 400 can also lock the first moving rack 103 or the second moving rack 107. Its specific installation position is not limited by the present invention, and the purpose is to be able to prevent the ablation electrode 201 from contracting during the operation.

[0077] In one embodiment, as Figure 11As shown, in order to achieve a larger ablation range, a plurality of expandable ablation electrodes 201 are provided at the distal end of the delivery sheath 200. When the number of ablation electrodes 201 is greater than 2, a first connecting member 102 is provided between two adjacent ablation electrodes 201. The first connecting member 102 is movably sleeved on the traction wire 300, and the two ends of two adjacent ablation electrodes 201 are respectively connected to the two ends of the first connecting member 102. In this embodiment, the first connecting member 102 is provided with a certain length, so that there is a certain distance between two adjacent ablation electrodes 201.

[0078] Furthermore, the first connecting member 102 and the two ablation electrodes 201 connected to the two ends of the first connecting member 102 are of an integral structure. The first connecting member 102 is made of a conductive material. When the electrode wire 204 is connected to one of the ablation electrodes 201, a plurality of ablation electrodes 201 can be energized to form a monopolar ablation structure, improving the ablation range to adapt to the ablation of larger lesions.

[0079] Furthermore, the first connecting member 102 can be made of an insulating material. To expand the ablation range, any two of the plurality of ablation electrodes 201 can be correspondingly connected to the positive electrode wire and the negative electrode wire, so that a bipolar ablation structure is formed between the two ablation electrodes 201 connected to the positive electrode wire and the negative electrode wire. Since the current of the bipolar structure passes through the medium stably, the current density is stable, so that the output energy efficiency in the bipolar state is more stable.

[0080] When a plurality of ablation electrodes 201 are correspondingly connected to the positive electrode wire, ablation of a single ablation electrode 201 can be achieved, reducing the ablation range to adapt to the ablation of smaller ablation lesions.

[0081] Furthermore, when there are a plurality of ablation electrodes 201, the sizes of the ablation electrodes 201 are different. The ablation electrode 201 far from the distal end of the delivery sheath 200 has a small expansion range, and the ablation electrode 202 near the distal end of the delivery sheath 200 has a large expansion range to adapt to the needs of different lesions.

[0082] In one embodiment, as Figure 10 and Figure 12 shown, in order to facilitate the surgical staff to confirm the position of the ablation catheter, since the ablation catheter needs to be used in the working channel of the endoscope 500, a scale mark 205 is provided at the distal end of the delivery sheath 200. The scale marks 205 are evenly distributed from the distal end of the delivery sheath 200 to its proximal end. When the ablation catheter extends out of the working forceps channel, the scale marks 205 will be exposed under the lens of the endoscope 500. The surgical staff can observe the scale marks 205 through the lens to judge the position of the ablation electrode 201, enabling the ablation electrode 201 to accurately reach the lesion position and increasing the success rate of the surgery.

[0083] In one embodiment, the ablation electrode 201 has a basket weaving structure. Specifically, the ablation electrode 201 is prepared by weaving metal wires. The ablation electrode 201 prepared in this way can be opened and closed in size, and has characteristics such as small resistance and small external tension. It can fully conform to the lesion site while causing less damage to the airway, and can obtain good treatment effects after releasing pulsed electric fields.

[0084] Furthermore, the material of the weaving wire of the ablation electrode 201 is a metal material with small resistance and good elasticity that is not prone to plastic deformation, and can be SUS304, SUS316L, cobalt-chromium alloy, nickel-titanium alloy, etc.;

[0085] Furthermore, after expansion, the ablation electrode 201 with a basket weaving structure can be in the shape of a water droplet, spindle, blade, etc. For this type of shape, the outer diameter of the middle region is large, the outer diameter of the two end regions is small, and the supporting force of the two end regions is strong, while the supporting force of the middle region is weak. The strong supporting force on both sides can ensure that the ablation electrode is straight, and the small supporting force in the middle region has good compliance and can ensure a good wall attachment effect.

[0086] Furthermore, the weaving method of the ablation electrode 201 with a basket weaving structure can be 1-over-1, 1-over-2, 2-over-2 or other weaving methods. This weaving method can make the ablation electrode 201 open and close evenly and circularly, can comprehensively cover the diseased airway, and obtain good treatment effects.

[0087] Furthermore, the weaving density PPI of the ablation electrode 201 with a basket weaving structure can be 5 to 60. This weaving density can provide good radial supporting force when opened, can fit closely with the airway, and obtain good treatment effects. At the same time, when closed, this weaving density has a small outer contour diameter and can pass through the working channel of the endoscope, facilitating reaching the lesion site.

[0088] Furthermore, the ablation electrode 201 is polished, has a small high-frequency resistance, improves the transmission ability of pulsed electric fields, and promotes the electroporation effect of cells.

[0089] Furthermore, electrode rings 202 are provided at both ends of the ablation electrode 201 with a basket weaving structure. The electrode rings 202 wrap both ends of the ablation electrode 201 with a basket weaving structure to limit the longitudinal length of the ablation electrode 201.

[0090] Furthermore, the electrode wire is connected to the electrode ring 202 for conduction to avoid virtual connection and leakage, thereby improving the stability of conduction.

[0091] In one embodiment, a guiding tip 301 is provided at one end of the traction wire 300 close to the ablation electrode 201, and one end of the ablation electrode 201 is fixed to the guiding tip 301. Wherein, a smooth guiding structure is provided at the end of the guiding tip 301 away from the ablation electrode 201, and the smooth guiding structure is a spherical surface or an arc surface. Specifically, the guiding tip 301 and the ablation electrode 201 can be connected by hot melting, glue bonding, laser welding or other means. The guiding tip 301 has a soft characteristic, and can effectively reduce the damage to the human body cavity during the process of introducing it into the airway or other human body cavities. Further, the guiding tip 301 is made of a polymer material, and can be composed of block polyether amide resin, polyurethane rubber, silica gel, etc. By providing the smooth guiding structure, the damage to the inner wall of the human body cavity can be effectively reduced during the process of introducing it into the human body cavity.

[0092] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An ablation handle, characterized in that, Including: A housing, a transmission assembly, and a push rod. The transmission assembly is disposed inside the housing. One end of the push rod passes through the housing and is connected to the transmission assembly. The push rod can perform reciprocating linear movement relative to the housing. The transmission assembly includes a first moving rack, a gear assembly, and a second moving rack. The first moving rack is movably disposed inside the housing and meshes with the gear assembly. One end of the first moving rack is connected to one end of the push rod. The second moving rack is movably disposed inside the housing and meshes with the gear assembly, and the moving direction of the second moving rack is opposite to that of the first moving rack. By providing the gear assembly, the stroke of the second moving rack is made greater than the stroke of the first moving rack.

2. The ablation handle according to claim 1, characterized in that, The gear assembly includes a first driving gear, a second driven large gear, and a second driven small gear. Among them, the first driving gear is rotatably disposed inside the housing and meshes with the first moving rack. The second driven large gear and the second driven small gear are coaxially fixedly connected and rotatably disposed inside the housing. The second driven small gear meshes with the first driving gear, and the second driven large gear meshes with the second moving rack. Among them, the outer diameter of the second driven small gear is smaller than the outer diameter of the second driven large gear, and the outer diameter of the first driving gear is larger than the outer diameter of the second driven small gear.

3. The ablation handle according to claim 2, wherein, The ratio range of the outer diameter of the second driven large gear to the outer diameter of the second driven small gear is 1:1.1 to 1:

5.

4. The ablation handle according to claim 1, wherein A first limiting structure is provided between the housing and the first moving rack to enable the first moving rack to perform reciprocating linear movement. The first limiting structure includes a first limiting groove provided on the housing and a first limiting boss provided on the first moving rack, or a first limiting boss provided on the housing and a first limiting groove provided on the first moving rack. The first limiting boss is movably clamped in the first limiting groove.

5. The ablation handle according to claim 1, characterized in that, A first through hole is provided on the housing, a first bracket is provided inside the housing, and a first support hole is provided on the first bracket. The first through hole, the first support hole, and the push rod are coaxially arranged. One end of the push rod passes through the first through hole and the first support hole and is connected to the first moving rack.

6. The ablation handle according to claim 5, wherein A first limiting block is provided on one side of the push rod close to the first through hole, and the outer diameter of the first limiting block is larger than the inner diameter of the first through hole.

7. An ablation handle according to claim 6, characterized in that, A return spring is provided between the first limiting block and the first bracket. One end of the return spring abuts against the first bracket, and the other end of the return spring abuts against the first limiting block. In the initial state, the return spring is in a natural state or a compressed state.

8. An ablation handle according to claim 4, wherein, A second limiting structure is provided between the housing and the second moving rack. The second limiting structure is used for the second moving rack to perform reciprocating linear movement. The second limiting structure includes a second limiting groove provided on the housing and a second limiting boss provided on the second moving rack, or a second limiting boss provided on the housing and a second limiting groove provided on the second moving rack. The second limiting boss is movably clamped in the second limiting groove.

9. The ablation handle according to claim 8, wherein, The first limiting structure is arranged on the side of the first moving rack away from the second moving rack, the second limiting structure is arranged on the side of the second moving rack away from the first moving rack, one side of the side surface of the first moving rack abuts against one side surface of the first limiting groove, and the second moving rack abuts against one side surface of the second limiting groove.

10. An ablation handle according to claim 9, wherein, The first moving rack is provided with a first abutting surface, the second moving rack is provided with a second abutting surface, and the first abutting surface and the second abutting surface abut against each other.

11. An ablation handle according to claim 9, characterized in that, A first limiting plate is arranged in the shell, and the upper end surfaces of the first moving rack and the second moving rack both abut against the first limiting plate.

12. The ablation handle according to claim 2, wherein, It further includes a locking mechanism, and the locking mechanism is used to maintain the current expanded state of the ablation electrode.

13. An ablation handle according to claim 12, wherein, The locking mechanism includes a locking pawl, a locking pawl lever and a tension spring. The locking pawl is rotatably arranged on the shell. One end of the locking pawl lever passes through the shell and abuts against the locking pawl. One end of the tension spring is connected to the locking pawl lever, and the other end thereof is connected to the shell. In the initial state, the locking pawl abuts against a tooth groove of the transmission assembly. Among them, the push rod can only move towards the shell side. When the push rod is pushed, the locking pawl can move to the next adjacent tooth groove under the action of the tension spring and abut.

14. An ablation handle according to claim 13, wherein, A locking limit block is arranged on the locking pawl lever, and the locking limit block abuts against the inner wall of the shell in the initial state.

15. An ablation catheter, characterized in that, It includes the ablation handle according to any one of claims 1-14.

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