Ablation forceps

Abstract

The ablation forceps comprise a forceps holder assembly, an ablation assembly and an electrical connection assembly, the forceps holder assembly comprises a far-end forceps holder and a near-end forceps holder, and the far-end forceps holder and the near-end forceps holder can be close to each other or away from each other. The ablation assembly comprises a far-end electrode set installed on the far-end forceps holder, a near-end electrode set installed on the near-end forceps holder and electrode marks arranged on the surface of the near-end forceps holder, the far-end electrode set and the near-end electrode set respectively comprise at least one electrode, and each electrode on the near-end forceps holder corresponds to one electrode mark. Electrode positions corresponding to the electrode marks are judged through the electrode marks, the electrodes on the forceps holder assembly are connected with the electrical connection assembly through wires, and the electrical connection assembly is connected with the ablation instrument. An operator can master the positions of the ablation electrodes during treatment, the positions of the ablation forceps are adjusted or ablation areas are arranged according to the positions and the attaching conditions of the electrodes, the safety and effectiveness of an operation are improved, the ablation effect is better, and the operation duration is shorter.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, and particularly relates to an ablation forceps. BACKGROUND

[0002] Atrial fibrillation is a common arrhythmia, which is characterized by irregular heart rate and ineffective atrial contraction, and is one of the causes of stroke, coronary heart disease, heart failure, hypertension and other diseases, and can seriously threaten the life safety of patients.

[0003] The clinical methods for treating atrial fibrillation include drug therapy, cardiothoracic surgery ablation, and intracardiac catheter ablation, among which, cardiothoracic surgery ablation has a higher success rate and a lower recurrence rate. In cardiothoracic surgery ablation, pulse ablation forceps are used for treatment, which is an effective treatment method for arrhythmia. Different from the radiofrequency ablation and cryoablation commonly used in the clinic, pulse electric field ablation has good tissue selectivity, can avoid damage to non-target tissues, and more safely and efficiently ablates the target tissues around the heart to isolate abnormal electrical signals and restore normal heart rhythm.

[0004] In surgical treatment, the pulse ablation forceps need to clamp the target tissue with a certain thickness, and the ablation electrode needs to be continuously adjusted by the operator in real time in terms of the abutting force and position of the target tissue, so as to ensure the completeness of ablation and the continuity of the ablation position. Therefore, the abutting condition of the ablation electrode and the target tissue will affect the duration and effect of the operation.

[0005] Related terms are explained as follows:

[0006] Atrial fibrillation: atrial fibrillation (short for atrial fibrillation) is the most common persistent arrhythmia. The incidence of atrial fibrillation increases with age, and can reach 10% in people over 75 years old. When atrial fibrillation occurs, the frequency of atrial activation is 300-600 times / min, and the heart rate is often fast and irregular, sometimes up to 100-160 times / min, which is not only much faster than normal heart rate, but also absolutely irregular, and the atrium loses effective contraction function. The prevalence of atrial fibrillation is also closely related to coronary heart disease, hypertension and heart failure.

[0007] Pulse ablation: pulse electric field ablation (PFA) is a non-thermal energy ablation (no Joule heat) process in which short-term, high-voltage multiple electric pulses are used to release ablation energy, effectively induce myocardial cells to undergo electroporation, and make extracellular cations enter cells, so that myocardial cells are fragmented and die (pulse electric field ablation is also called irreversible electroporation).

[0008] Radiofrequency ablation: Radiofrequency ablation (RF) is to release radiofrequency current to kill abnormal myocardial cells at a specific site, and cold saline perfusion radiofrequency ablation catheter uses low temperature physiological saline to flush the head end of the catheter during the ablation process, reduces the temperature of the head electrode, and reduces the temperature of the tissue interface while discharging at high frequency, reduces the risk of serious complications such as thrombosis, and reduces the pain of patients.

[0009] Pulmonary vein isolation: the main operation for atrial fibrillation treatment.

[0010] Local impedance: a method for evaluating the electrical coupling of the tissue, the electrode is applied with electrical energy, and when the electrode is close to the target tissue, the reactance between the direct measurement electrode and its adjacent electrode is calculated to indicate the contact of the target tissue. Invention content

[0011] In view of the above problems existing in the prior art, the purpose of the utility model is to provide an ablation forceps, the operator can master the position of the ablation electrode and the ablation electrode in the treatment and the ablation electrode and the target tissue, and the ablation electrode is adjusted according to the position and the ablation electrode, and the ablation area is set, each electrode is independently connected with the electrical connector through the wire, so as to be independently connected with the ablation instrument, so that the operator can flexibly select the electrode to be powered on and powered off, so as to flexibly and accurately select the area and position to be ablated, improve the safety and effectiveness of the operation, and the ablation effect is better and the operation time is shorter.

[0012] In order to achieve the above purpose, the technical scheme adopted by the utility model is:

[0013] An ablation forceps, comprising a clamp assembly, an ablation assembly and an electrical connection assembly, the clamp assembly comprises a distal clamp and a proximal clamp, the distal clamp and the proximal clamp can be close to or away from each other, the ablation assembly comprises a distal electrode group installed on the distal clamp, a proximal electrode group installed on the proximal clamp and an electrode mark arranged on the surface of the proximal clamp, the distal electrode group and the proximal electrode group respectively contain at least one electrode, each electrode on the proximal clamp corresponds to an electrode mark, the position of the electrode corresponding to each electrode mark is judged through each electrode mark, each electrode on the clamp assembly is connected with the electrical connection assembly through a wire, and the electrical connection assembly is connected with an ablation instrument capable of providing discharge energy.

[0014] As a further improvement of the above technical scheme:

[0015] The ablation forceps further comprise a connecting assembly, a movable rod and a handle assembly, the distal clamp is fixedly connected with the connecting assembly, the proximal clamp is slidably arranged on the connecting assembly, one end of the movable rod is connected with the proximal clamp, the other end of the movable rod is connected with the handle assembly, and the proximal clamp is closer to the handle assembly than the distal clamp.

[0016] The electrode mark is coincided with the projection of the corresponding electrode on the installation surface where the electrode mark is located, and the electrode mark faces the handle assembly.

[0017] The distal clamp and the proximal clamp are both arc-shaped or straight hollow structures, and are arranged in parallel, one side wall of the distal clamp facing the proximal clamp is provided with a plurality of installation holes, the installation holes are communicated with the inside of the distal clamp, and the installation holes are arranged along the length direction of the distal clamp; one side wall of the proximal clamp facing the distal clamp is also provided with a plurality of installation holes, the installation holes are communicated with the inside of the proximal clamp, and the installation holes are arranged along the length direction of the proximal clamp; the installation holes on the distal clamp are used for installing the electrodes of the distal electrode group, and the installation holes on the proximal clamp are used for installing the electrodes of the proximal electrode group.

[0018] The connecting assembly comprises a distal connecting piece and a connecting pipe, the distal connecting piece is formed by removing material from a hollow structure to form a long groove, one side of the inside of the distal connecting piece is provided with a sliding groove, the length direction of the sliding groove is consistent with the length direction of the distal connecting piece, the connecting pipe is a hollow tubular structure, the distal connecting piece and the connecting pipe are coaxially fixedly connected, one end of the connecting pipe is coaxially fixedly connected with the distal connecting piece, the other end is fixedly connected with the handle assembly, one end of the distal clamp is fixedly connected with the distal connecting piece, and the other end is overhanging, one end of the proximal clamp is slidably arranged on the sliding groove, and the other end is overhanging.

[0019] The movable rod is a hollow rod structure, the movable rod is located in the connecting assembly, the length direction of the movable rod is consistent with the length direction of the connecting pipe, the movable rod can move along the axial direction of the connecting pipe, and one end of the proximal clamp slidably arranged on the sliding groove is fixedly connected with the movable rod.

[0020] The handle assembly comprises a handle upper shell, a handle lower shell, a limiting assembly, a push rod and a third elastic element, the handle upper shell and the handle lower shell can be covered and clamped with each other to form a structure with an internal cavity, the internal cavity is a handle cavity, one end of the connecting assembly away from the clamp assembly is fixedly connected in the handle cavity, one end of the movable rod is connected with the proximal clamp, the other end extends into the handle cavity and is fixedly connected with the push rod, one end of the push rod is located in the handle cavity and is connected with the movable rod, the other end is located outside the handle cavity, the elastic element assembly is sleeved with the movable rod between the push rod and the connecting assembly, when the push rod pushes the movable rod to adhere to the proximal clamp and the distal clamp, the limiting assembly and the limiting hole on the push rod are aligned, and the limiting assembly is pushed into the limiting hole under the elastic force of the third elastic element to prevent the movable rod from moving.

[0021] The elastic element assembly of the movable rod outer sleeve between the connecting assembly and the push rod comprises a first elastic element, a second elastic element and a connecting block, the connecting block is sleeved outside the movable rod and can move along the movable rod, an outer surface of one end of the movable rod is provided with a guide groove, the length direction of the guide groove is consistent with the length direction of the movable rod, a pin is slidably arranged on the guide groove of the movable rod after penetrating through the side wall of the connecting block, the first elastic element is located between the connecting block and the connecting assembly, one end of the first elastic element is fixedly connected with the connecting assembly or the handle assembly, and the other end of the first elastic element is fixedly connected with the connecting block, the second elastic element is located between the connecting block and the push rod, one end of the second elastic element is fixedly connected with the push rod, and the other end of the second elastic element is fixedly connected with the connecting block.

[0022] The limiting assembly comprises a key, a connecting piece and a limiting block which are sequentially connected along a direction, the direction is the length direction of the limiting assembly, the push rod is provided with a limiting hole, the limiting hole is divided into a blocking part and a passing part along the length direction of the limiting hole, the blocking part and the passing part are communicated, the blocking part is closer to the movable rod than the passing part, the length direction of the limiting hole is consistent with the length direction of the movable rod, the width of the blocking part is smaller than the width of the passing part, the width direction of the blocking part or the passing part is perpendicular to the length direction of the limiting hole, the connecting piece can pass through the blocking part and the passing part, the limiting block can pass through the passing part and cannot pass through the blocking part, the length direction of the limiting assembly is perpendicular to the length direction of the movable rod, the key is located on the handle upper shell and is located outside the handle cavity, the connecting piece passes through the limiting hole, one end of the third elastic element is connected with the limiting block, and the other end of the third elastic element is connected to the inner wall of the handle lower shell, and the third elastic element is in a compressed state.

[0023] The height of the side wall surface where the electrode is higher is 0-1mm, when the electrode is circular, the diameter of a single electrode is 0.5-5mm, when the electrode is square, the side length of a single electrode is 0.5-5mm, and the interval between adjacent electrodes is 1-10mm.

[0024] The utility model discloses beneficial effect is:

[0025] (1) the ablation forceps are used for carrying out the ablation treatment of heart surgery, and the ablation efficiency is high, and the effect is good.

[0026] (2) the proximal clamp is provided with electrode mark that marks each electrode position, and the electrode mark is towards handle assembly, i.e. the operator, so that the operator can intuitively, quickly and accurately know the position of each electrode, and the position of the electrode is the position for ablation, and the electrode mark does not additionally occupy the space of the ablation forceps, does not affect the ablation operation and does not affect the human body tissue to be ablated or other normal tissues.

[0027] (3) Each electrode is connected to an electrical connector through a wire, so as to be connected to the ablation instrument independently, thus the operator can flexibly select the electrodes to be powered on and powered off, so as to flexibly and accurately select the ablation area and position. For example, the fat outside the heart of some obese patients is thick, and the ablation electrode cannot be avoided from contacting the fat when clamping the pulmonary vein, at this time, the electrodes to be powered on and powered off can be selected to avoid ablation in the fat area.

[0028] (4) The abutting condition of the electrode is determined by observing the impedance of each electrode, and the ablation clamp position is adjusted or the ablation area is set according to the abutting condition.

[0029] (5) During ablation, the position of the electrode can be quickly determined through the electrode mark, the abutting condition of the electrode is determined by observing the impedance of each electrode, so as to adjust the ablation clamp position or set the ablation area according to the position and abutting condition of each electrode, and the ablation area is set by selecting the electrodes to be powered on, so that the ablation area is accurately and flexibly selected, the safety and effectiveness of the operation are improved, the ablation effect is better, and the operation time is shorter, and it is not necessary to constantly confirm the ablation position and adjust the ablation clamp position. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a structural schematic diagram of an embodiment of the utility model.

[0031] Figure 2 is a structural schematic diagram of the utility model, wherein the distal clamp and the proximal clamp are arc-shaped.

[0032] Figure 3 is another view of the structural schematic diagram of the utility model. Figure 2

[0033] Figure 4 is a structural schematic diagram of the utility model, wherein the distal clamp and the proximal clamp are linear.

[0034] Figure 5 is a structural schematic diagram of a handle assembly of an embodiment of the utility model.

[0035] Figure 6 is a structural schematic diagram of a limiting assembly of an embodiment of the utility model.

[0036] Figure 7 is a structural schematic diagram of a limiting hole on a push rod of an embodiment of the utility model. DETAILED DESCRIPTION

[0037] The specific embodiments of the utility model will be described in detail in combination with the drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0038] ​For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0039] In this specification, "distal end" refers to the end relatively far from the user or the end relatively far from the main body of the device of the present invention (such as the handle assembly). "Proximal end" refers to the end relatively close to the user or the end relatively close to the main body of the device of the present invention (such as the handle assembly).

[0040] An ablation forceps, the ablation forceps is as follows Figures 1-7 As shown, it includes a clamp assembly 1, an ablation assembly 2, a connection assembly 3, a movable rod 4, a handle assembly 5, and an electrical connection assembly 6.

[0041] The discharge energy received by the ablation forceps may be pulse energy or radiofrequency energy. In other words, the ablation forceps may perform ablation by using pulse energy or radiofrequency energy.

[0042] The jaw assembly 1 includes a distal jaw 1-1 and a proximal jaw 1-2. The distal jaw 1-1 and the proximal jaw 1-2 can be moved closer or further apart to grasp the target tissue for ablation. Both the distal jaw 1-1 and the proximal jaw 1-2 are curved or straight rod-like structures. They are arranged in parallel.

[0043] In this embodiment, the distal jaw 1-1 and the proximal jaw 1-2 are of the same length. Preferably, the length of the distal jaw 1-1 and the proximal jaw 1-2 is 50-100 mm. When the distal jaw 1-1 and the proximal jaw 1-2 are curved, the length and curvature of the distal jaw 1-1 and the proximal jaw 1-2 are the same, with the curvature being 0-5 degrees. The concave and convex directions of the distal jaw 1-1 and the proximal jaw 1-2 are aligned, i.e., the convex side of the distal jaw 1-1 faces the concave side of the proximal jaw 1-2.

[0044] The distal jaw 1-1 and the proximal jaw 1-2 are both connected to the connecting assembly 3 at one end and overhanging at the other end. Specifically, the distal jaw 1-1 and the proximal jaw 1-2 can be connected to the connecting assembly 3 respectively, or the distal jaw 1-1 and the proximal jaw 1-2 can be connected to each other first, and then connected to the connecting assembly 3.

[0045] The distal jaw 1-1 and the proximal jaw 1-2 are both hollow structures. Preferably, the cross-section of the distal jaw 1-1 and the proximal jaw 1-2 is rectangular. A plurality of mounting holes are provided on one side wall of the distal jaw 1-1 facing the proximal jaw 1-2, the mounting holes are in communication with the inside of the distal jaw 1-1, and the plurality of mounting holes are arranged at intervals along the length direction of the distal jaw 1-1. Preferably, the plurality of mounting holes of the distal jaw 1-1 are arranged at equal intervals. Similarly, a plurality of mounting holes are also provided on one side wall of the proximal jaw 1-2 facing the distal jaw 1-1, the mounting holes are in communication with the inside of the proximal jaw 1-2, and the plurality of mounting holes are arranged at intervals along the length direction of the proximal jaw 1-2. Preferably, the plurality of mounting holes of the proximal jaw 1-2 are arranged at equal intervals. When the distal jaw 1-1 and the proximal jaw 1-2 are moved to contact each other, the plurality of mounting holes on the distal jaw 1-1 are in contact and alignment with the plurality of mounting holes on the proximal jaw 1-2. The mounting holes on the distal jaw 1-1 and the proximal jaw 1-2 are used to mount the ablation assembly 2.

[0046] The material of the distal jaw 1-1 and the proximal jaw 1-2 is stainless steel, alloy, ceramic or other composite materials.

[0047] The ablation assembly 2 includes a distal electrode group 2-1 mounted on the distal jaw 1-1, a proximal electrode group 2-2 mounted on the proximal jaw 1-2, and an electrode marker 2-3 provided on the proximal jaw 1-2. The distal electrode group 2-1 is mounted on the mounting hole of the distal jaw 1-1, and the proximal electrode group 2-2 is mounted on the mounting hole of the proximal jaw 1-2. The distal electrode group 2-1 and the proximal electrode group 2-2 are respectively connected to the electrical connection assembly 6 through wires.

[0048] The distal electrode group 2-1 and the proximal electrode group 2-2 each contain at least one electrode, which can be circular, square or filamentous in shape, preferably circular. Each electrode is mounted on one of the mounting holes, and at most one electrode is mounted on each mounting hole. If there are two or more electrodes in the same electrode group, the polarity of adjacent electrodes in the same electrode group is opposite (one positive and one negative), and the shapes of the electrodes can be freely combined. Each electrode in the same electrode group is arranged along the length direction of the distal electrode group 2-1 or the proximal electrode group 2-2 with the same spacing. Obviously, when the jaw assembly 1 clamps the target tissue, the electrodes will adhere to the target tissue to perform ablation.

[0049] The electrodes are installed in the mounting holes and protrude from the side walls where they are installed, and the height of the protrusion from the surface of the side walls is 0-1 mm. In order to avoid unnecessary mechanical damage to the target tissue when the clamp assembly 1 is clamped, the height is preferably 0.1-0.5 mm.

[0050] Since the clamp assembly 1 is not transparent, the positions of the electrodes cannot be directly observed. Therefore, electrode markers 2-3 are provided to mark and indicate the positions of the electrodes. The operator can determine the positions of the electrodes by directly observing the positions of the electrode markers 2-3, thereby achieving the effect of assisting ablation. Specifically, the electrode markers 2-3 are provided on the outer surface of the side wall of the proximal clamp 1-2 opposite to the side wall where the electrodes are installed. In other words, the electrode markers 2-3 are installed on the outer surface of the side wall of the proximal clamp 1-2 facing the handle assembly 5, as shown in FIG. 2. Figures 2-4 The shapes of the electrode markers 2-3 can be the same as the shapes of the electrodes, such as circles, squares, solid dots, straight lines, curves, etc. Each electrode on the proximal clamp 1-2 corresponds to an electrode marker 2-3, and each electrode marker 2-3 coincides with the projection of the corresponding electrode on the installation surface of the electrode marker 2-3. During surgery, the operator can determine the positions of the electrodes by directly observing the positions of the electrode markers 2-3. The positions of the observed electrode markers 2-3 can be regarded as the positions of the corresponding electrodes, thereby achieving the effect of assisting ablation. The means for marking the electrode markers 2-3 include laser marking, machining, spraying biocompatible composite materials, labeling, and painting.

[0051] The connecting assembly 3 includes a distal connecting piece 3-1 and a connecting tube 3-2. The distal connecting piece 3-1 is formed by removing material from a hollow structure, so that the distal connecting piece 3-1 forms a long groove structure. One side of the inner groove of the distal connecting piece 3-1 is provided with a sliding groove 3-3, and the length direction of the sliding groove 3-3 is consistent with the length direction of the distal connecting piece 3-1. The connecting tube 3-2 is a hollow tubular structure, and the distal connecting piece 3-1 and the connecting tube 3-2 are coaxially fixedly connected. One end of the connecting tube 3-2 is coaxially fixedly connected with the distal connecting piece 3-1, and the other end is fixedly connected with the handle assembly 5.

[0052] One end of the distal clamp 1-1 is fixedly connected with the distal connecting piece 3-1, and the other end is cantilevered. One end of the proximal clamp 1-2 is slidably arranged in the sliding groove 3-3, and the other end is cantilevered. Preferably, the proximal clamp 1-2 is provided with a protrusion that can slide in the sliding groove 3-3. As another embodiment, the distal connecting piece 3-1 and the distal clamp 1-1 are fixedly integrated, and the proximal clamp 1-2 is slidably arranged in the distal connecting piece 3-1 and then integrally connected with the connecting tube 3-2.

[0053] The movable rod 4 is a hollow rod structure, and is located in the connecting assembly 3. The length direction of the movable rod 4 is consistent with the length direction of the connecting pipe 3-2, and the movable rod 4 is movable along the axial direction of the connecting pipe 3-2. One end of the proximal clamp 1-2 slidingly arranged on the sliding groove 3-3 is fixedly connected with the movable rod 4.

[0054] As can be seen from the above, in the embodiment, the distal clamp 1-1 is a fixed clamp, and the proximal clamp 1-2 is a movable clamp. The proximal clamp 1-2 is closer to the handle assembly 5 than the distal clamp 1-1.

[0055] In the embodiment, the distal connecting piece 3-1, the connecting pipe 3-2 and the movable rod 4 are made of stainless steel, alloy or other composite materials.

[0056] In the embodiment, the cross section of the movable rod 4 is rectangular or circular.

[0057] As shown in Figure 5 , the handle assembly 5 comprises a handle upper shell 5-1, a handle lower shell 5-2, a limiting assembly 5-3, a push rod 5-4, an elastic element assembly and a third elastic element 5-9. The elastic element assembly comprises a first elastic element 5-5, a pin 5-6, a connecting block 5-7 and a second elastic element 5-8.

[0058] The handle upper shell 5-1 and the handle lower shell 5-2 can be overlapped and clamped with each other to form a structure with an internal cavity, and the internal cavity is defined as a handle cavity. The overlapped structure is L-shaped, which is convenient for a hand to hold. One end of the connecting pipe 3-2 is fixedly connected in the handle cavity, and the other end is fixedly connected with the distal connecting piece 3-1. One end of the movable rod 4 is connected with the proximal clamp 1-2, and the other end of the movable rod 4 is fixedly connected with the push rod 5-4 after extending out of the connecting pipe 3-2. The end of the movable rod 4 extending out of the connecting pipe 3-2 is located in the handle cavity, and one end of the push rod 5-4 is located in the handle cavity to connect with the movable rod 4, and the other end of the push rod 5-4 is located outside the handle cavity to facilitate a hand to operate the push rod 5-4. When the push rod 5-4 is pushed by the hand, the push rod 5-4 drives the movable rod 4 to move synchronously.

[0059] The movable rod 4 between the connecting tube 3-2 and the push rod 5-4 is outer-connected with a first elastic element 5-5, a second elastic element 5-8, and a connecting block 5-7. The connecting block 5-7 is sleeved outside the movable rod 4 and can move along the movable rod 4. To ensure smoother and more stable movement of the connecting block 5-7, a guide groove is provided on the outer surface of one end of the movable rod 4. The length of the guide groove is consistent with the length of the movable rod 4. The pin 5-6 passes through the side wall of the connecting block 5-7 and slides into the guide groove of the movable rod 4. The first elastic element 5-5 is located between the connecting block 5-7 and the connecting tube 3-2. One end of the first elastic element 5-5 is fixedly connected to the connecting tube 3-2 or the inner wall of the handle cavity, and the other end is fixedly connected to the connecting block 5-7. The second elastic element 5-8 is located between the connecting block 5-7 and the push rod 5-4. One end of the second elastic element 5-8 is fixedly connected to the push rod 5-4, and the other end is fixedly connected to the connecting block 5-7.

[0060] In this embodiment, the first elastic element 5-5 and the second elastic element 5-8 are both springs, the first elastic element 5-5 is a thick spring, and the second elastic element 5-8 is a thin spring. In other words, the diameter of the metal wire constituting the first elastic element 5-5 is larger than the diameter of the metal wire constituting the second elastic element 5-8.

[0061] Furthermore, in order to lock the proximal clamp 1-2, a limiting assembly 5-3 and a third elastic element 5-9 are provided. Figure 6 As shown, it includes a key 5-3-1, a connector 5-3-2, and a limit block 5-3-3 connected in sequence along one direction, and this direction is assumed to be the length direction of the limit assembly 5-3. The connector 5-3-2 is thinner than the key 5-3-1 and the limit block 5-3-3. In other words, the width of the connector 5-3-2 is smaller than the width of the limit block 5-3-3 and the key 5-3-1. The width refers to the size of the corresponding components in the direction perpendicular to the length of the limit assembly 5-3. A limit hole 5-4-1 is provided on the push rod 5-4, as shown in FIG. Figure 7 As shown, the limiting hole 5-4-1 is divided into a blocking portion 5-4-11 and a passing portion 5-4-12 along its length. The blocking portion 5-4-11 and the passing portion 5-4-12 are connected. The blocking portion 5-4-11 is closer to the movable rod 4 than the passing portion 5-4-12. The length direction of the limiting hole 5-4-1 is consistent with the length direction of the movable rod 4. The width of the blocking portion 5-4-11 is smaller than the width of the passing portion 5-4-12. The width direction of the blocking portion 5-4-11 or the passing portion 5-4-12 is perpendicular to the length direction of the limiting hole 5-4-1. The connecting piece 5-3-2 can pass through the blocking portion 5-4-11 and the passing portion 5-4-12, and the limiting block 5-3-3 can pass through the passing portion 5-4-12 but cannot pass through the blocking portion 5-4-11.

[0062] The limit assembly 5-3 is movably mounted on the handle upper shell 5-1 and the handle lower shell 5-2. Specifically, the length of the limit assembly 5-3 is perpendicular to the length of the movable rod 4. The button 5-3-1 is located on the handle upper shell 5-1 and outside the handle cavity for easy manual operation. The connector 5-3-2 passes through the limit hole 5-4-1. The limit block 5-3-3 is connected to one end of the third elastic element 5-9, and the other end of the third elastic element 5-9 is connected to the inner wall of the handle lower shell 5-2. The third elastic element 5-9 is in a compressed state.

[0063] Based on the above structure, when a person presses the button 5-3-1, the limiting component 5-3 moves toward the direction close to the third elastic element 5-9, and the third elastic element 5-9 is further compressed.

[0064] In this embodiment, the third elastic element 5 - 9 is a spring.

[0065] When the ablation forceps is in its initial state, free from external forces, the proximal jaw 1-2 is at its farthest position from the distal jaw 1-1. The button 5-3-1 and the stopper 5-3-3 are located on either side of the push rod 5-4, respectively. The connector 5-3-2 passes through the blocking portion 5-4-11 and is located at the end of the blocking portion 5-4-11 near the movable rod 4. The stopper 5-3-3 is located between the push rod 5-4 and the handle lower shell 5-2, and the third elastic element 5-9 is compressed.

[0066] Based on the above structure, the clamping, locking and resetting functions can be achieved by operating the handle assembly 5. The specific implementation method is as follows:

[0067] Clamping function: When the push rod 5-4 is pushed, the distance between the push rod 5-4 and the connecting tube 3-2 decreases, the first elastic element 5-5 and the second elastic element 5-8 are compressed, the push rod 5-4 drives the movable rod 4, and the movable rod 4 drives the proximal clamp 1-2 to move, and the proximal clamp 1-2 moves toward the direction close to the distal clamp 1-1 until the two are in contact to clamp the tissue to be ablated.

[0068] Locking function: When the push rod 5-4 is pushed, the limiting assembly 5-3 and the push rod 5-4 move relative to each other, with the movement direction being a decrease in the distance between the limiting assembly 5-3 and the passage portion 5-4-12. When the proximal clamp 1-2 is in close contact with the distal clamp 1-1, the passage portion 5-4-12 and the limiting block 5-3-3 are aligned. Under the elastic force of the third elastic element 5-9, the limiting assembly 5-3 moves away from the handle lower shell 5-2, and the limiting block 5-3-3 engages the passage portion 5-4-12. Blocked by the limiting block 5-3-3, the push rod 5-4 cannot move further, and thus the proximal clamp 1-2 cannot move further. This locks the push rod 5-4 and the distance between the proximal clamp 1-2 and the distal clamp 1-1, allowing the operator to complete the ablation procedure without having to exert force to hold the push rod 5-4 in place.

[0069] Reset function: after the ablation operation is completed, the user presses the button 5-3-1, the third elastic element 5-9 is compressed, the limiting assembly 5-3 moves towards the handle lower shell 5-2, the limiting block 5-3-3 exits the through part 5-4-12, and returns to between the through part 5-4-12 and the handle lower shell 5-2. The push rod 5-4 is no longer locked, the first elastic element 5-5 and the second elastic element 5-8 are returned from the compressed state, and the push rod 5-4 is pushed back to the initial position, driving the movable rod 4 and the proximal clamp 1-2 to move away from the distal clamp 1-1 until the farthest distance from the distal clamp 1-1 is reached.

[0070] The electrical connection assembly 6 includes a power line 6-1 and an electrical connector 6-2. The power line 6-1 has a wire inside that is led out from the distal clamp 1-1 and the proximal clamp 1-2, and the wire passes through the gap between the movable rod 4 or the movable rod 4 and the connecting tube 3-2. The power line sheath is made of rubber, silicone, high polymer material or other soft composite material, which has good insulation and flame retardance. One end of the electrical connector 6-2 is welded with the wire inside the power line, and the other end is connected with the ablation instrument. The ablation instrument provides discharge energy for the electrode to realize ablation and auxiliary ablation functions. The ablation instrument can use the pulse ablation instrument in the prior art.

[0071] Inside the distal clamp 1-1 and the proximal clamp 1-2, each electrode of the distal electrode group 2-1 and each electrode of the proximal electrode group 2-2 is welded with a different wire, respectively. The wire connecting the electrodes of the distal electrode group 2-1 passes through the distal clamp 1-1, then passes through the distal connecting piece 3-1 and the movable rod 4 in turn, and is led out from the tail of the handle assembly 5 and welded with the electrical connector 6-2. Similarly, the wire connecting the electrodes of the proximal electrode group 2-2 passes through the proximal clamp 1-2 and enters the connecting piece 3-1. As another embodiment, the electrical connector 6-2 can be directly installed on the handle assembly 5 and connected with the wire inside the handle assembly 5, without the need to be led out through the power line 6-1.

[0072] From the above, each electrode is connected to the electrical connector 6-2 through a wire, and each electrode does not affect each other, which is convenient for individually controlling each electrode during ablation operation.

[0073] In the ablation system formed by connecting the ablation forceps and the ablation instrument, the condition that the electrodes abut against the tissue to be ablated is determined by local impedance display. After the ablation forceps are connected with the ablation instrument, each electrode on the ablation forceps collects local impedance data through the ablation instrument, all the local impedance data are judged by the algorithm module built-in the ablation instrument in real time, and the ablation operator is prompted about the abutting state of each electrode on the operation interface by rendering the electrode color, such as "not abutting", "abutting", "half abutting", etc., so as to achieve the purpose of assisting ablation. After the ablation instrument is connected with the ablation forceps, the ablation instrument automatically identifies the model of the ablation forceps and displays information including but not limited to the characteristics of the ablation forceps and the electrode number, electrode shape, electrode state, etc. on the operation interface, so that the ablation operator can set each electrode on the operation interface and decide the ablatable area autonomously, so as to achieve the purpose of assisting ablation. The ablation operator can autonomously select the ablation mode or discharge mode on the operation interface, which is flexible and suitable for different use scenarios, so as to achieve the effect of assisting ablation.

[0074] Specifically, a chip is built-in the handle assembly 5 to record the number of the ablation forceps currently used, and the chip is connected with the external ablation instrument through the electrical connector 6-2. After the ablation forceps are connected with the ablation instrument, the ablation instrument automatically reads the number in the chip and matches the corresponding ablation forceps characteristics in the built-in ablation forceps database, such as electrode size, ablation forceps shape and corresponding ablation energy, etc. After the matching is completed, the shape of the ablation forceps and the electrodes are drawn on the display interface, i.e. the operation interface. The ablation operator can click the electrodes displayed on the interface to achieve the operation of energizing or disconnecting the electrodes, autonomously decide the electrodes participating in discharge and control the ablation area. The electrodes participating in discharge will respectively detect local impedance data in real time and feed back to the abutting algorithm module in the ablation instrument. The local impedance data are calculated by the abutting algorithm module to determine the abutting state of the electrodes, and the results are fed back to the display interface by rendering the electrodes. That is, in addition to the electrode identification designed on the ablation forceps, the ablation operator can also determine the abutting degree of the electrodes by rendering the electrodes on the display interface.

[0075] Based on the ablation method of the ablation forceps, after the clamping assembly 1 clamps the target tissue, the position of each electrode corresponding to the electrode identification 2-3 and the abutting state of each electrode determined by the local impedance data displayed on the operation interface are determined, and then the position of the ablation forceps is adjusted or the ablation area is set according to the position and abutting state of each electrode, and the ablation area is set by selecting the electrodes to be energized. The target tissue area where the electrodes to be energized are located is the selected ablation area. It should be noted that the ablation operator adjusts the position of the ablation forceps manually according to the clinical experience and the specific condition of the patient.

[0076] Preferably, the operation interface can be arranged on the handle assembly 5 or arranged in a state separate from the ablation forceps.

[0077] In the embodiment, the output voltage between the electrodes is 500-5000V, preferably 1000-2600V.

[0078] For circular or square electrodes, the diameter or side length of a single electrode is 0.5-5mm. Further, when the ablation energy is in the form of pulse energy, the diameter or side length of the electrode is preferably 1.5-3mm.

[0079] The distance between adjacent electrodes is 1-10mm, further, when the ablation energy is in the form of pulse energy, to adapt to the different voltage requirements of pulse ablation, the distance is preferably 2-5mm:

[0080] When the output voltage is below 1400V, the distance between the electrodes is preferably 2mm;

[0081] When the output voltage is 1400V-1800V, the distance between the electrodes is preferably 3mm;

[0082] When the output voltage is 1800V-2200V, the distance between the electrodes is preferably 4mm;

[0083] When the output voltage is 2200V-2600V, the distance between the electrodes is preferably 5mm.

[0084] Finally, it is necessary to point out that: the above embodiments are only used to further detail the technical scheme of the utility model, and cannot be understood as a limitation on the protection scope of the utility model. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the utility model belong to the protection scope of the utility model.

Claims

1. An ablation forceps, characterized in that: The invention comprises a clamp assembly (1), an ablation assembly (2) and an electrical connection assembly (6). The clamp assembly (1) comprises a distal clamp (1-1) and a proximal clamp (1-2). The distal clamp (1-1) and the proximal clamp (1-2) can be close to or far away from each other. The ablation assembly (2) comprises a distal electrode group (2-1) installed on the distal clamp (1-1), a proximal electrode group (2-2) installed on the proximal clamp (1-2), and an electrode marker (2-3) arranged on the surface of the proximal clamp (1-2). The distal electrode group (2-1) and the proximal electrode group (2-2) respectively comprise at least one electrode. Each electrode on the proximal clamp (1-2) corresponds to an electrode marker (2-3). The position of the electrode corresponding to each electrode marker (2-3) is determined. Each electrode on the clamp assembly (1) is connected to the electrical connection assembly (6) via a wire. The electrical connection assembly (6) is connected to the ablation instrument.

2. The ablation forceps according to claim 1, characterized in that: The ablation forceps also includes a connecting component (3), a movable rod (4) and a handle component (5); the distal clamp (1-1) and the connecting component (3) are fixedly connected, the proximal clamp (1-2) is slidably arranged on the connecting component (3), one end of the movable rod (4) is connected to the proximal clamp (1-2), and the other end is connected to the handle component (5); the proximal clamp (1-2) is closer to the handle component (5) than the distal clamp (1-1).

3. The ablation forceps according to claim 2, characterized in that: Each electrode marker (2-3) is overlapped with the projection of each corresponding electrode on the mounting surface where the electrode marker (2-3) is located, and the electrode marker (2-3) faces the handle assembly (5).

4. The ablation forceps according to claim 2, characterized in that: The distal clamp (1-1) and the proximal clamp (1-2) are both arc-shaped rod-shaped hollow structures or straight rod-shaped hollow structures. The distal clamp (1-1) and the proximal clamp (1-2) are arranged in parallel. A plurality of mounting holes are provided on a side wall of the distal clamp (1-1) facing the proximal clamp (1-2). The mounting holes are connected to the interior of the distal clamp (1-1). The plurality of mounting holes are arranged at intervals along the length direction of the distal clamp (1-1). A plurality of mounting holes are also provided on a side wall of the proximal clamp (1-2) facing the distal clamp (1-1). The mounting holes are connected to the interior of the proximal clamp (1-2). The plurality of mounting holes are arranged at intervals along the length direction of the proximal clamp (1-2). The mounting holes on the distal clamp (1-1) are used to mount electrodes of the distal electrode group (2-1), and the mounting holes on the proximal clamp (1-2) are used to mount electrodes of the proximal electrode group (2-2).

5. The ablation forceps according to claim 2, characterized in that: The connecting assembly (3) comprises a distal connecting piece (3-1) and a connecting tube (3-2). The distal connecting piece (3-1) is a structure with a long groove formed by removing material from a hollow structure. A slide groove (3-3) is provided on the inner concave side of the distal connecting piece (3-1). The length direction of the slide groove (3-3) is consistent with the length direction of the distal connecting piece (3-1). The connecting tube (3-2) is a hollow tubular structure. The distal connecting piece (3-1) and the connecting tube (3-2) are coaxially fixedly connected. One end of the connecting tube (3-2) is coaxially fixedly connected to the distal connecting piece (3-1) and the other end is fixedly connected to the handle assembly (5). One end of the distal clamp (1-1) is fixedly connected to the distal connecting piece (3-1) and the other end is cantilevered. One end of the proximal clamp (1-2) is slidably arranged on the slide groove (3-3) and the other end is cantilevered.

6. The ablation forceps according to claim 5, characterized in that: The movable rod (4) is a hollow rod-shaped structure. The movable rod (4) is located in the connecting assembly (3). The length direction of the movable rod (4) is consistent with the length direction of the connecting tube (3-2). The movable rod (4) can move along the axial direction of the connecting tube (3-2). One end of the proximal clamp (1-2) that is slidably arranged on the slide groove (3-3) is fixedly connected to the movable rod (4).

7. The ablation forceps according to any one of claims 2 to 6, characterized in that: The handle assembly (5) comprises an upper handle shell (5-1), a lower handle shell (5-2), a limiting assembly (5-3), a push rod (5-4) and a third elastic element (5-9). The upper handle shell (5-1) and the lower handle shell (5-2) can be covered and clamped with each other to form a structure with an internal cavity. The internal cavity is set as the handle cavity. One end of the connecting assembly (3) away from the clamp assembly (1) is fixedly connected to the handle cavity. One end of the movable rod (4) is connected to the proximal clamp (1-2), and the other end extends into the handle cavity and is fixedly connected to the push rod (5-4). The push rod (5-4) One end of the push rod (5-4) is located in the handle cavity and connected to the movable rod (4), and the other end is located outside the handle cavity. The movable rod (4) between the push rod (5-4) and the connecting assembly (3) is connected to an elastic element assembly. When the push rod (5-4) pushes the movable rod (4) until the proximal clamp (1-2) and the distal clamp (1-1) are in contact, the limiting assembly (5-3) and the limiting hole (5-4-1) on the push rod (5-4) are aligned, and the limiting assembly (5-3) is pushed into the limiting hole (5-4-1) under the elastic force of the third elastic element (5-9) to prevent the movable rod (4) from moving.

8. The ablation forceps according to claim 7, characterized in that: The elastic element assembly connected to the outer surface of the movable rod (4) between the connecting assembly (3) and the push rod (5-4) includes a first elastic element (5-5), a second elastic element (5-8) and a connecting block (5-7). The connecting block (5-7) is sleeved outside the movable rod (4) and can move along the movable rod (4). A guide groove is provided on the outer surface of one end of the movable rod (4). The length direction of the guide groove is consistent with the length direction of the movable rod (4). A pin (5-6) passes through the side wall of the connecting block (5-7) and is slidably arranged on the movable rod. (4), a first elastic element (5-5) is located between the connecting block (5-7) and the connecting assembly (3), one end of the first elastic element (5-5) is fixedly connected to the connecting assembly (3) or the handle assembly (5), and the other end is fixedly connected to the connecting block (5-7), and a second elastic element (5-8) is located between the connecting block (5-7) and the push rod (5-4), one end of the second elastic element (5-8) is fixedly connected to the push rod (5-4), and the other end is fixedly connected to the connecting block (5-7).

9. The ablation forceps according to claim 7, characterized in that: The limiting assembly (5-3) comprises a button (5-3-1), a connecting piece (5-3-2) and a limiting block (5-3-3) connected in sequence along one direction. The direction is assumed to be the length direction of the limiting assembly (5-3). A limiting hole (5-4-1) is provided on the push rod (5-4). The limiting hole (5-4-1) is divided into a blocking portion (5-4-11) and a passing portion (5-4-12) along its length direction. The blocking portion (5-4-11) and the passing portion (5-4-12) are connected. The blocking portion (5-4-11) is closer to the movable rod (4) than the passing portion (5-4-12). The length direction of the limiting hole (5-4-1) is consistent with the length direction of the movable rod (4). The width of the blocking portion (5-4-11) is smaller than the width of the passing portion (5-4-12). The blocking portion (5-4-11) or the passing portion (5-4-12) is The width direction of the portion (5-4-12) is perpendicular to the length direction of the limiting hole (5-4-1); the connecting piece (5-3-2) can pass through the blocking portion (5-4-11) and the passing portion (5-4-12); the limiting block (5-3-3) can pass through the passing portion (5-4-12) but cannot pass through the blocking portion (5-4-11); the length direction of the limiting assembly (5-3) is perpendicular to the length direction of the movable rod (4); the button (5-3-1) is located on the handle upper shell (5-1) and outside the handle cavity; the connecting piece (5-3-2) passes through the limiting hole (5-4-1); the limiting block (5-3-3) is connected to one end of the third elastic element (5-9); the other end of the third elastic element (5-9) is connected to the inner wall of the handle lower shell (5-2); and the third elastic element (5-9) is in a compressed state.

10. The ablation forceps according to claim 1, characterized in that: The height of the electrode above the side wall surface is 0-1mm. When the electrode is circular, the diameter of a single electrode is 0.5-5mm. When the electrode is square, the side length of a single electrode is 0.5-5mm. The spacing between adjacent electrodes is 1-10mm.

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