Tissue incision device

Abstract

The utility model relates to the technical field of medical instruments, and provides a tissue incision device which comprises a tool bit electrode, an end tube, a sheath tube and a loop electrode. The scalpel head electrode is movably inserted into the end tube, the sheath tube is arranged outside the end tube in a sleeving mode, the protective electrode is located on the peripheral side of the scalpel head electrode, and when the scalpel head electrode stretches out, the protective electrode is located on the outer peripheral side of the scalpel head electrode. The distance between the protection electrode and the loop electrode is smaller than the distance between the tool bit electrode and the loop electrode, so that the protection electrode and the loop electrode discharge preferentially. According to the tissue incision device, the protection electrode and the loop electrode are preferentially discharged; through the arrangement, the cutter head electrode can be protected from being corroded and fused by electric sparks, and the service life of the tissue incision device can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a tissue cutting device. Background Technology

[0002] Under the endoscopic view of the digestive tract, a high-frequency electrosurgical unit, acting as a tissue cutting device, outputs high-frequency electricity from its electrodes to act on the mucosal tissue, causing the mucosal tissue cells to vaporize or lose water, thus cutting the mucosal tissue. However, during the use of a bipolar electrosurgical unit, the electrical sparks in some areas of the electrodes are intense. If used for too long, these areas may be corroded or melted by the electrical sparks, causing damage to the instrument and delaying the surgery. Utility Model Content

[0003] Therefore, this utility model aims to solve the problem in the prior art that during the use of bipolar electrosurgical units, the electrode area experiences intense electric sparks, and if used for too long, this area will be corroded and melted by the electric sparks, causing damage to the instrument and delaying the operation. In this way, a tissue cutting device is provided.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] This invention provides a tissue cutting device, including a cutting tip electrode, an end tube, a sheath, and a circuit electrode. The cutting tip electrode is movably inserted into the end tube, the sheath is sleeved outside the end tube, and the circuit electrode is spaced apart from the cutting tip electrode. The device also includes a protective electrode located on the outer periphery of the cutting tip electrode. At least when the cutting tip electrode is extended, the distance between the protective electrode and the circuit electrode is less than the distance between the cutting tip electrode and the circuit electrode, so that the protective electrode preferentially discharges with the circuit electrode.

[0006] Furthermore, the cutter electrode includes an electrode rod and a distal end located at the distal end of the electrode rod, and the protective electrode includes a first protective electrode protruding from the outer periphery of the electrode rod, at least a portion of which is located in the cavity of the end tube.

[0007] Furthermore, the protective electrode includes a second protective electrode protruding from the outer periphery of the distal end.

[0008] Furthermore, the protective electrode protrudes from the outer wall of the cutter electrode; or / and the protective electrode is disposed on the inner wall of the end tube.

[0009] Furthermore, the first protective electrode is disposed on the outer side wall of the electrode rod, and when the cutter electrode is extended, the distal end of the first protective electrode is flush with, convex outward or concave inward relative to the distal end of the end tube; or / and, the first protective electrode is disposed on the inner side wall of the end tube, and the distal end of the first protective electrode is flush with, convex outward or concave inward relative to the distal end of the end tube.

[0010] Furthermore, the second protective electrode is disposed on the outer side wall of the distal end, and when the cutting electrode is retracted, the distal end of the second protective electrode protrudes outward relative to the distal end of the end tube; or / and, the second protective electrode is disposed on the inner side wall of the end tube, and the distal end of the second protective electrode is flush with, convex outward or concave inward relative to the distal end of the end tube.

[0011] Furthermore, the end tube is provided with a distal limiting structure and / or a proximal limiting structure; wherein, the distal limiting structure restricts the extension position of the cutting electrode, and when the cutting electrode is extended, the first protective electrode preferentially discharges with the circuit electrode; wherein, the proximal limiting structure restricts the retraction position of the cutting electrode, and when the cutting electrode is retracted, the second protective electrode provided on the outer periphery of the distal end preferentially discharges with the circuit electrode.

[0012] Furthermore, the distal limiting structure includes a first limiting portion located at the proximal end of the cutting tip electrode and a second limiting portion located at the proximal end of the end tube. When the cutting tip electrode is extended, the first limiting portion and the second limiting portion abut against each other. The proximal limiting structure also includes a third limiting portion located on the end tube and a limiting member located on the cutting tip electrode. When the cutting tip electrode is retracted, the third limiting portion abuts against the proximal end of the limiting member. The third limiting portion is a limiting step portion located at the distal end of the end tube and / or within the cavity of the end tube. When the third limiting portion is the distal end of the end tube, the limiting member is the second protective electrode. When the third limiting portion is the limiting step portion, the limiting member is the first protective electrode or an independent component.

[0013] Furthermore, the protective electrode is circumferentially arranged around the outer periphery of the cutter electrode.

[0014] Furthermore, the protective electrode is a columnar structure that bulges outward relative to the outer wall of the cutter electrode in the radial direction; the columnar structure is sealed in the circumferential direction, or the columnar structure has gaps in the circumferential direction and / or axial direction.

[0015] Furthermore, when the distal end of the first protective electrode protrudes outward relative to the distal end of the end tube, the length range X1 of the protrusion of the first protective electrode along the axial direction of the first protective electrode is 0 mm < X1 ≤ 0.3 mm; or / and, when the distal end of the first protective electrode is concave inward relative to the distal end of the end tube, the length range X2 of the concavity of the first protective electrode along the axial direction of the first protective electrode is 0.05 mm ≤ X2 ≤ 0.15 mm.

[0016] Furthermore, in the proximal-to-distal direction, the distal surface of the protective electrode is inclined toward the axis of the cutting head electrode.

[0017] Furthermore, the circuit electrode is disposed outside the sheath, and the circuit electrode is insulated from the cutter electrode and the protection electrode.

[0018] Furthermore, the tissue cutting device also includes a sleeve and a resilient fluid seal; the cutting electrode has a fluid outlet hole; the fluid seal is fitted onto the proximal end of the cutting electrode; the sleeve is fitted over the fluid seal, with the distal ends of both the sleeve and the fluid seal abutting against the proximal end of the end tube, thereby confining the fluid seal inside the sleeve through the end tube and the sleeve; the sheath is fitted over the outside of the sleeve, and the sleeve and the sheath are press-fitted together so that the sheath applies a force to the sleeve to compress the fluid seal.

[0019] Furthermore, the end tube has a fluid outlet hole, and / or the sheath has a fluid outlet hole, and / or the cutter electrode has a fluid outlet hole; an indicator mark is provided at the distal end of the sheath, and the indicator mark is positioned towards the fluid outlet hole along the radial direction of the sheath.

[0020] Furthermore, the tissue cutting device also includes an operating part, which includes a main body and a sliding member slidably disposed on the main body. The sliding member and the cutting electrode are connected by a first wire. An electrical connector is disposed on the main body, the distal end of the main body, or the sliding member. The electrical connector includes an active electrode and a passive electrode. The active electrode is electrically connected to the cutting electrode through the first wire, and the passive electrode is connected to a circuit electrode through a second wire.

[0021] The technical solution of this utility model has the following advantages:

[0022] The tissue cutting device provided by this utility model has a protective electrode on the outer periphery of the blade electrode. At least when the blade electrode is extended, the distance between the protective electrode and the circuit electrode is smaller than the distance between the blade electrode and the circuit electrode, so that the protective electrode discharges preferentially with the circuit electrode. With this setting, the electric spark will act on the protective electrode, which can protect the blade electrode from being corroded or melted by the electric spark, and is beneficial to improving the service life of the tissue cutting device. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the distal portion of the tissue cutting device in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the blade electrode in the tissue cutting device according to an embodiment of the present invention;

[0026] Figure 3 This is a cross-sectional view of the extended state of the blade electrode in the tissue cutting device of this utility model embodiment;

[0027] Figure 4 This is a cross-sectional view of the retracted state of the blade electrode in the tissue cutting device of this utility model embodiment;

[0028] Figure 5 This is a cross-sectional view of the tissue cutting device in this embodiment of the present invention, showing that the first protective electrode is located on the outer wall of the blade electrode and protrudes outward from the far end of the end tube, and has an electro-corrosion notch.

[0029] Figure 6 This is a cross-sectional view of the tissue cutting device in this embodiment of the present invention when the first protective electrode or the second protective electrode is located on the inner side wall of the end tube and is flush with the distal end of the end tube.

[0030] Figure 7 This is a cross-sectional view of the tissue cutting device in this embodiment of the present invention, showing the first or second protective electrode located on the inner wall of the end tube and protruding outward relative to the far end of the end tube.

[0031] Figure 8 This is a cross-sectional view of the internal liquid channel of the tissue cutting device in an embodiment of the present invention;

[0032] Figure 9This is a cross-sectional view of the sleeve and the elastic fluid seal in the tissue cutting device of this utility model embodiment;

[0033] Figure 10 This is a schematic diagram of the other distal portion of the tissue cutting device in an embodiment of the present invention;

[0034] Figure 11 This is a schematic diagram of the proximal portion of the tissue cutting device in an embodiment of the present invention;

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Cutting electrode; 2. End tube; 3. Sheath; 4. Circuit electrode; 5. First protective electrode; 6. Second protective electrode; 7. Third limiting part; 8. Electro-corrosion notch; 9. Fluid seal; 10. Sleeve; 11. Fluid outlet; 12. Indicator mark; 13. Connecting tube; 14. First wire; 15. Conductive tube; 16. Second wire; 17. Electrode channel; 18. Connecting tube channel; 19. Sheath channel; 20. Electrode rod; 21. Distal end; 22. Operating part; 23. Main body; 24. Sliding part; 25. Passive electrode; 26. Active electrode; M1. Current path; 27. Elongation mark; 28. Water inlet; 29. ​​Elastic element. Detailed Implementation

[0037] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0038] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] In the embodiments of this specification, "proximal" and "distal" can refer to directions, with the side facing the operator being the "proximal" and the side facing the insertion into the body for treatment being the "distal". "Proximal" and "distal" can also refer to the part of the structure and the end located in the corresponding direction.

[0041] In the embodiments of this specification, "axial" and "radial" can refer to directions. For example, the axial direction of the protective electrode refers to the direction along the center line or rotation axis of the protective electrode, and the "radial" direction is perpendicular to the "axial" direction.

[0042] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0043] like Figures 1 to 10As shown, this embodiment provides a tissue cutting device, including a cutting electrode 1, an end tube 2, a sheath 3, and a return electrode 4. For example, the end tube 2 is an insulating tube, specifically a ceramic tube, a metal tube with an insulating sleeve or insulating coating, etc. The cutting electrode 1 is movably inserted into the end tube 2, and the sheath 3 is sleeved outside the end tube 2. For example, the return electrode 4 can be disposed on the outer wall of the sheath 3, and a second wire 16, such as a molybdenum wire, can be disposed in one cavity of the sheath 3. The second wire 16 is welded to the return electrode 4 through a conductive tube 15. The return electrode 4 is spaced apart from the cutting electrode 1 to achieve insulation. The spaced separation can be achieved through various means such as gaps, insulating components (such as the insulating end tube 2), etc. It also includes a protective electrode located on the outer periphery of the cutting electrode 1, that is, the protective electrode protrudes from the outer periphery of the cutting electrode 1 in the radial direction. For example, the protective electrode can be protruding from the outer wall of the cutting electrode 1; or, for another example, the protective electrode can be disposed on the inner wall of the end tube 2. The protective electrode and the circuit electrode 4 are spaced apart to achieve insulation. This spacing can be achieved through various means such as gaps, insulating components (e.g., insulating end tubes 2). At least when the cutting electrode 1 extends towards the distal end, the distance between the protective electrode and the circuit electrode 4 is less than the distance between the cutting electrode 1 and the circuit electrode 4, so that the protective electrode preferentially discharges with the circuit electrode 4, and the protective electrode preferentially discharges with the circuit electrode 4.

[0044] The tissue cutting device provided in this embodiment has a protective electrode on the outer periphery of the blade electrode 1. At least when the blade electrode 1 is extended, the distance between the protective electrode and the circuit electrode 4 is less than the distance between the blade electrode 1 and the circuit electrode 4, so that the protective electrode discharges preferentially with the circuit electrode 4. With this setting, the electric spark will act on the protective electrode, which can protect the blade electrode 1 from being corroded or melted by the electric spark, which is beneficial to improving the service life of the tissue cutting device.

[0045] like Figure 2 , Figure 3 as well as Figure 4As shown, the cutting electrode 1 includes an electrode rod 20 and a distal end 21 located at the distal end of the electrode rod 20. The cutting electrode 1 can be a needle knife, hook knife, IT knife, etc. The distal end 21 can be a column with the same structure as the electrode rod 20, a cutting disc radially protruding from the outer wall of the electrode rod 20, or a hook portion radially protruding from the outer wall of the electrode rod 20, etc. The protective electrode includes a first protective electrode 5 protruding from the outer periphery of the electrode rod, at least a portion of which is located in the cavity of the end tube 2. For example, the first protective electrode 5 can be disposed on the outer wall of the electrode rod, and the electrode rod and the first protective electrode 5 can be integrally machined or welded together. When the cutting electrode 1 is extended, the distal end of the first protective electrode 5 is flush with, convex with, or concave with the distal end of the end tube 2. For example, the first protective electrode 5 can be disposed on the inner sidewall of the end tube 2, and the distal end of the first protective electrode 5 is flush with, convex with, or concave with the distal end of the end tube 2. Regarding the flush, convex or concave position, it is sufficient to ensure that the distance between the first protective electrode 5 and the circuit electrode 4 is less than the distance between the cutting electrode 1 and the circuit electrode 4 and to form a shorter current path M1.

[0046] Wherein, when the distal end of the first protective electrode protrudes outward relative to the distal end of the end tube 2, the length range X1 of the protrusion of the first protective electrode along the axial direction is 0 mm < X1 ≤ 0.3 mm. For example, the length of the protrusion of the first protective electrode along the axial direction can be 0.15 mm. Wherein, when the distal end of the first protective electrode is concave relative to the distal end of the end tube 2, the length range X2 of the concavity of the first protective electrode along the axial direction is 0.05 mm ≤ X2 ≤ 0.15 mm. For example, the length of the concavity of the first protective electrode along the axial direction can be 0.1 mm.

[0047] In this configuration, the distal surface of the protective electrode is inclined toward the axis of the cutting tip electrode 1 in the proximal-to-distal direction. For example, the angle between the end face of the protective electrode and the axis of the cutting tip electrode 1 on its distal side can be in the range of 117°-123°, such as 120°. This configuration can further increase the volume of the protective electrode, thereby increasing the lifespan of the cutting tip electrode 1.

[0048] like Figure 2 , Figure 3 , Figure 6 as well as Figure 7As shown, the protective electrode includes a second protective electrode 6 protruding from the outer periphery of the distal end. For example, the second protective electrode 6 can be disposed on the outer wall of the distal end. For example, some types of cutting head electrodes 1 have a cutting head disc, which can directly serve as the second protective electrode 6. When the cutting head electrode 1 retracts towards the proximal end, the distal end of the second protective electrode 6 protrudes outward relative to the distal end of the end tube 2, which facilitates marking. At this time, the distance between the second protective electrode 6 and the circuit electrode 4 is smaller than the distance between the cutting head electrode 1 and the circuit electrode 4, so that the second protective electrode 6 preferentially discharges with the circuit electrode 4.

[0049] For example, the second protective electrode 6 can be disposed on the inner wall of the end tube 2. The distal end of the second protective electrode 6 is flush with, convex outward, or concave inward relative to the distal end of the end tube 2. In this case, regardless of whether the blade electrode 1 is extended or retracted, the second protective electrode 6 on the inner wall of the end tube 2 serves as a protective electrode. Therefore, when the protective electrode is disposed on the inner wall of the end tube 2, the first protective electrode 5 and the second protective electrode 6, which serve as protective electrodes, can be the same component, and their related characteristics are also the same. For example, the convex length range and the concave length range of the second protective electrode 6 are the same as the data of the first protective electrode 5 regarding X1 and X2. The distance between the second protective electrode 6 and the circuit electrode 4 is smaller than the distance between the blade electrode 1 and the circuit electrode 4, so that the second protective electrode 6 preferentially discharges with the circuit electrode 4. This arrangement can protect the blade electrode 1 from corrosion and melting by electric sparks, which is beneficial to improving the service life of the tissue cutting device.

[0050] The end tube 2 is provided with a distal limiting structure and / or a proximal limiting structure. The distal limiting structure restricts the extension position of the cutting electrode 1. When the cutting electrode 1 extends, the first protective electrode 5 preferentially discharges with the circuit electrode 4. For example, the distal limiting structure includes a first limiting portion located near the proximal end of the cutting electrode 1 and a second limiting portion located near the proximal end of the end tube 2. When the cutting electrode 1 extends, the first limiting portion and the second limiting portion abut against each other. For example, the first limiting portion can be an annular limiting member, and the second limiting portion can be a limiting step.

[0051] The proximal limiting structure restricts the retraction position of the cutting tip electrode 1. When the cutting tip electrode 1 retracts, the second protective electrode 6, located on the outer periphery of the distal end, preferentially discharges with the circuit electrode 4. The proximal limiting structure includes a third limiting portion 7 on the end tube 2 and a limiting member on the cutting tip electrode 1. When the cutting tip electrode 1 retracts, the third limiting portion 7 abuts against the proximal end of the limiting member. The third limiting portion 7 is a limiting step portion located at the distal end of the end tube 2 and / or within the cavity of the end tube 2. When the third limiting portion 7 is the distal end of the end tube 2, the limiting member is the second protective electrode 6, and the outer diameter of the second protective electrode 6 is larger than the inner diameter of the end tube 2's opening. When the third limiting portion 7 is the limiting step portion, the limiting member is the first protective electrode 5 or an independent component.

[0052] The protective electrode is circumferentially arranged around the outer periphery of the cutting electrode 1. For example, the protective electrode is a columnar structure that bulges outward from the outer wall of the cutting electrode 1 in the radial direction; the columnar structure is sealed in the circumferential direction (e.g., cylindrical), or the columnar structure has gaps in the circumferential and / or axial directions (e.g., multiple strips, multiple rings, spirals, etc.). For example, the protective electrode can be a ring structure, which can have gaps in the circumferential or axial directions, or it can be a continuous structure. These gaps are preferably evenly spaced (e.g., the spacing between multiple strips, multiple rings, and spirals is uniform to ensure the stability of the discharge between the protective electrode and the circuit electrode 4); its specific structure and distribution are not limited, as long as it can ensure that the protective electrode preferentially discharges with the circuit electrode 4 when the cutting electrode 1 is extended or retracted.

[0053] For example, the radial thickness of the protective electrode protruding from the cutting tip electrode 1 can range from 0.03mm to 0.13mm, for example, the radial thickness can be 0.08mm. The axial thickness can range from 0.65mm to 0.75mm, for example, the axial thickness can be 0.70mm.

[0054] like Figure 5 As shown, after the protective electrode is subjected to electrical spark corrosion, an electrical corrosion notch 8 will be formed, thereby protecting the inside of the cutting tip electrode 1 from corrosion.

[0055] like Figure 8 , Figure 9As shown, the tissue cutting device further includes a sleeve 10 and an elastic fluid seal 9; the cutting electrode 1 has a fluid outlet hole 11; the fluid seal 9 is fitted onto the proximal end of the cutting electrode 1; the sleeve 10 is fitted over the fluid seal 9, and the distal ends of both the sleeve 10 and the fluid seal 9 abut against the proximal end of the end tube 2, thereby confining the fluid seal 9 inside the sleeve 10; the sheath 3 is fitted over the sleeve 10, and the sleeve 10 and the sheath 3 are press-fitted together so that the sheath 3 applies a force to the sleeve 10 to compress the fluid seal 9. For example, the elastic fluid seal 9 may be made of materials including, but not limited to, elastomers such as silicone and rubber. The sleeve 10 may be made of materials including, but not limited to, metal and ceramic.

[0056] For example, the blade electrode 1 can be welded to the connecting tube 13 within the tissue cutting device, and the connecting tube 13 can be welded to the first wire 14 (such as a torque rope) within the tissue cutting device. Liquid enters the connecting tube channel 18 from the sheath channel 19 within the tissue cutting device, then enters the electrode channel 17, and flows out from the distal end of the blade electrode 1. When the liquid enters the sheath channel 19, it simultaneously enters the sleeve 10 and applies liquid pressure to the elastic fluid seal 9. When the liquid pressure increases to approximately 600 kPa, the liquid pressure causes the elastic fluid seal 9 to deform, converting the liquid pressure into sealing pressure, further enhancing the sealing performance. With this configuration, the blade electrode 1 and the sleeve 10 form an interference fit through the elastic fluid seal 9, which applies sealing pressure to both the blade electrode 1 and the sleeve 10, achieving a seal. The sheath 3 applies pressure to the sleeve 10, achieving a seal. The above achieves the sealing of other channels for liquid outflow, concentrating the liquid within electrode channel 17 and allowing it to flow out from the fluid outlet at the distal end of the blade electrode 1. The concentrated liquid energy more easily penetrates the submucosa, causing the mucosal tissue to bulge and improving surgical efficiency. Moreover, when the blade electrode 1 extends or retracts to the designated position, the elastic fluid seal 9 applies pressure to the blade electrode 1, generating friction that locks the blade electrode 1 in the designated position. The extension and retraction position of the electrode can be locked at any time without the need for handle operation, reducing the operator's workload.

[0057] For example, to increase the flow rate, the cross-sectional area of ​​the electrode channel 17 of the cutter electrode 1 can be increased, with the cross-sectional area ranging from 0.0314 mm. 2- 0.0707mm 2 The flow rate should be no less than 20 mL / min.

[0058] like Figure 10As shown, the distal end of the end tube 2 may also be provided with a fluid outlet hole 11, or / and the sheath tube 3 may also have a fluid outlet hole 11, or / and the blade electrode 1 may have a fluid outlet hole 11; an indicator mark 12 is provided at the distal end of the sheath tube 3, and the indicator mark 12 is positioned towards the fluid outlet hole 11 along the radial direction of the sheath tube 3. This arrangement places the indicator mark 12 and the offset fluid outlet hole 11 on the same side, allowing the position of the indicator mark 12 to be observed to determine the position of the fluid outlet hole 11, facilitating operation. An extension mark 27 can also be provided at the distal end of the sheath tube 3 to determine the extension length of the instrument under endoscopic visualization, preventing excessive extension and perforation. For example, when setting the indicator mark 12 and the extension mark 27, ink can be printed and baked to solidify it onto the sheath tube 3 to a specified size.

[0059] Specifically, the diameter of the distal portion of the sheath 3 can be increased from 2.0 mm to 2.5 mm through a heat-forming process. This allows a larger area for the distal end of the instrument to rest against the mucosal tissue, making it less likely to perforate the mucosal tissue. At the same time, it also supports the already cut mucosal tissue, reserving more cutting space for the blade electrode 1.

[0060] like Figure 11 As shown, it also includes an operation unit 22, which includes a main body 23 and a slider 24 slidably disposed on the main body 23. The slider 24 and the cutter electrode 1 are connected by a first wire 14. An electrical connector is provided on the main body 23, the distal end of the main body 23, or the slider 24. The electrical connector includes an active electrode 26 and a passive electrode 25. The active electrode 26 is electrically connected to the cutter electrode 1 through the first wire 14, and the passive electrode 25 is connected to the circuit electrode 4 through a second wire 16.

[0061] A water inlet 28 is provided on the main body 23 or the far end of the main body 23 or the sliding member 24. The water inlet 28 is connected to the first wire 14, the sheath tube 3 and the cutter electrode 1. The first wire 14 is provided with an elastic member 29 (such as a crown spring, spring, etc.). The elastic member 29 is always in elastic contact with the first wire 14 and the active electrode 26 to maintain electrical connection.

[0062] When the tissue cutting device in this application is used, such as Figure 3 As shown, when the cutting electrode 1 is extended, the first protective electrode 5 is closest to the circuit electrode 4, and the conductive path is the current path M1, resulting in the most intense electrical spark at the first protective electrode 5. Figure 4As shown, when the cutting tip electrode 1 is retracted, the second protective electrode 6 is closest to the circuit electrode 4, and the conductive path is the current path M1. The second protective electrode 6 provides protection for the cutting tip electrode 1. Of course, there are also cases where the cutting tip electrode 1 is in the middle position, and the current acts on the cutting tip electrode 1. However, since the cutting tip electrode 1 is rarely in this position, the thickness of the cutting tip electrode 1 itself is sufficient to meet the service life requirements.

[0063] The operating procedure for this tissue cutting device is as follows:

[0064] S1: Obtain the feature information of the target object, and determine the target marker position based on the feature information;

[0065] S2: Power on, position the cutter electrode 1 to the target marking position and mark it. In this step, the cutter electrode 1 is retracted and marked by the distal end 21. The second protection electrode 6 and the circuit electrode 4 form a circuit.

[0066] S3: Determine the target pre-cutting position based on the target marker position;

[0067] S4: Power on, operate the cutter electrode 1 to pre-cut the target object along the target pre-cut position, and form a pre-cut on the target object. In this step, the cutter electrode 1 extends, and the first protection electrode 5 and the circuit electrode 4 form a circuit.

[0068] S5: Inject fluid into the pre-cut through the fluid outlet 11 of the device or the injection needle to make the target object bulge;

[0069] S6: Power on, operate the cutting head electrode 1 to cut according to the target mark position, and peel off the target object. In this step, the cutting head electrode 1 extends, and the first protective electrode 5 and the circuit electrode 4 form a circuit.

[0070] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A tissue cutting device, comprising a cutting tip electrode (1), an end tube (2), a sheath tube (3), and a circuit electrode (4); wherein the cutting tip electrode (1) is movably inserted into the end tube (2), the sheath tube (3) is sleeved outside the end tube (2), and the circuit electrode (4) is spaced apart from the cutting tip electrode (1), characterized in that, Also includes: A protective electrode is located on the outer periphery of the cutting head electrode (1). At least when the cutting head electrode (1) is extended, the distance between the protective electrode and the circuit electrode (4) is smaller than the distance between the cutting head electrode (1) and the circuit electrode (4), so that the protective electrode preferentially discharges with the circuit electrode (4).

2. The tissue cutting device according to claim 1, characterized in that, The cutter electrode (1) includes an electrode rod (20) and a distal end (21) located at the distal end of the electrode rod (20). The protective electrode includes a first protective electrode (5) protruding from the outer periphery of the electrode rod (20). At least a portion of the first protective electrode (5) is located in the cavity of the end tube (2).

3. The tissue cutting device according to claim 2, characterized in that, The protective electrode includes a second protective electrode (6) protruding from the outer periphery of the distal end.

4. The tissue cutting device according to claim 1, 2, or 3, characterized in that, The protective electrode protrudes from the outer wall of the cutter electrode (1); or / and, The protective electrode is disposed on the inner wall of the end tube (2).

5. The tissue cutting device according to claim 2, characterized in that, The first protective electrode (5) is disposed on the outer side wall of the electrode rod. When the cutter electrode (1) is extended, the distal end of the first protective electrode (5) is flush with, convex or concave compared to the distal end of the end tube (2). or / and, The first protective electrode (5) is disposed on the inner sidewall of the end tube (2), and the distal end of the first protective electrode (5) is flush with, convex or concave compared to the distal end of the end tube (2).

6. The tissue cutting device according to claim 3, characterized in that, The second protective electrode (6) is disposed on the outer wall of the distal end. When the cutter electrode (1) is retracted, the distal end of the second protective electrode (6) protrudes outward relative to the distal end of the end tube (2). or / and, The second protective electrode (6) is disposed on the inner side wall of the end tube (2), and the distal end of the second protective electrode (6) is flush with, convex outward or concave inward compared to the distal end of the end tube (2).

7. The tissue cutting device according to claim 2, characterized in that, The end tube (2) is provided with a distal limiting structure and / or a proximal limiting structure; The distal limiting structure restricts the extension position of the cutting electrode (1). When the cutting electrode (1) extends, the first protective electrode (5) discharges preferentially with the circuit electrode (4). The proximal limiting structure restricts the retraction position of the cutting head electrode (1). When the cutting head electrode (1) retracts, the second protective electrode (6) provided on the outer periphery of the distal end of the head discharges preferentially with the circuit electrode (4).

8. The tissue cutting device according to claim 7, characterized in that, wherein The distal limiting structure includes a first limiting part located at the proximal end of the cutting electrode (1) and a second limiting part located at the proximal end of the end tube (2). When the cutting electrode (1) is extended, the first limiting part and the second limiting part abut against each other. The proximal limiting structure includes a third limiting part (7) located on the end tube (2) and a limiting member located on the cutter electrode (1). When the cutter electrode (1) is retracted, the third limiting part (7) abuts against the proximal end of the limiting member. The third limiting part (7) is a limiting step located at the distal end of the end tube (2) or / and in the cavity of the end tube (2). When the third limiting part (7) is the distal end of the end tube (2), the limiting member is the second protective electrode (6). When the third limiting part (7) is the limiting step, the limiting member is the first protective electrode (5) or an independent component.

9. The tissue cutting device according to claim 1, characterized in that, The protective electrode is circumferentially arranged around the outer periphery of the cutter electrode (1).

10. The tissue cutting device according to claim 9, characterized in that, The protective electrode is a columnar structure that bulges outward from the outer wall of the cutter electrode (1) in the radial direction; The columnar structure is sealed in the circumferential direction, or the columnar structure has gaps in the circumferential direction and / or axial direction.

11. The tissue cutting device according to claim 2, characterized in that, When the distal end of the first protective electrode protrudes outward relative to the distal end of the end tube (2), the length range X1 of the protrusion of the first protective electrode along the axial direction of the first protective electrode is 0mm < X1 ≤ 0.3mm. or / and, When the distal end of the first protective electrode is recessed relative to the distal end of the end tube (2), the length range X2 of the recess of the first protective electrode along the axial direction of the first protective electrode is 0.05mm≤X2≤0.15mm.

12. The tissue cutting device according to claim 1, characterized in that, In the proximal to distal direction, the distal surface of the protective electrode is inclined toward the axis of the cutting head electrode (1).

13. The tissue cutting device according to claim 1, characterized in that, The circuit electrode (4) is disposed outside the sheath (3), and the circuit electrode (4) is insulated from the cutter electrode (1) and the protective electrode.

14. The tissue cutting device according to claim 1, characterized in that, It also includes a sleeve (10) and a flexible fluid seal (9); The cutter electrode (1) has a fluid outlet hole (11); The fluid seal (9) is sleeved on the proximal end of the cutter electrode (1); The sleeve (10) is sleeved outside the fluid seal (9), and the distal ends of the sleeve (10) and the fluid seal (9) abut against the proximal end of the end tube (2). The fluid seal (9) is confined inside the sleeve (10) by the end tube (2) and the sleeve (10). The sheath (3) is sleeved outside the sleeve (10), and the sleeve (10) and the sheath (3) are press-fitted together so that the sheath (3) applies a force to the sleeve (10) to compress the fluid seal (9).

15. The tissue cutting device according to claim 1, characterized in that, The end tube (2) has a fluid outlet hole (11), or / and the sheath tube (3) has a fluid outlet hole (11), or / and the cutter electrode (1) has a fluid outlet hole (11); An indicator mark (12) is provided at the distal end of the sheath (3), and the indicator mark (12) is positioned toward the fluid outlet (11) along the radial direction of the sheath (3).

16. The tissue cutting device according to claim 1, characterized in that, It also includes an operation unit (22), which includes a main body (23) and a slider (24) slidably disposed on the main body (23). The slider (24) and the cutter electrode (1) are connected by a first wire (14). An electrical connector is provided on the main body (23) or the far end of the main body (23) or the sliding member (24). The electrical connector includes an active electrode (26) and a passive electrode (25). The active electrode (26) is electrically connected to the cutter electrode (1) through the first wire (14), and the passive electrode (25) is connected to the circuit electrode (4) through a second wire (16).

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