Bipolar blood vessel sealing device with adjustable blade length

Abstract

The invention discloses a bipolar blood vessel closing device with adjustable knife bar length, comprising a handle and a knife bar assembly, the knife bar assembly comprising a connecting rod, a knife bar pusher movable assembly and a jaw closing rod movable assembly, the connecting rod comprising a fixed tube and a movable tube coaxially sleeved, the fixed tube being located in the handle and being fixed relative to the handle, the movable tube being inserted in the fixed tube and contacting a touch switch on a winding motor at one end, and extending out of the handle at the other end and being fixed to a jaw assembly at a distal end; the knife bar pusher movable assembly and the jaw closing rod movable assembly are axially parallel and arranged side by side inside the movable tube; the knife bar assembly further comprises a limit knob, which can perform circumferential rotational motion around the fixed tube, so that the movable tube can switch between a first state of axial telescopic motion relative to the fixed tube and a second state of being fixed relative to the fixed tube. No need to replace the instrument, the specifications and types of bipolar instruments required for the same operation are reduced, and the operation efficiency of doctors is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a bipolar blood vessel sealing device with adjustable blade rod length. Background Art

[0002] Bipolar vascular closure device is a high-frequency surgical device widely used in the field of surgery, mainly composed of bipolar instruments and energy generating devices. When working, the energy generating device outputs a specific form of bipolar high-frequency energy, which acts on the human vascular tissue through the bipolar instrument to close it. After the closure is successful, the built-in blade can be used to push the mechanical structure to cut off the vascular tissue that needs to be severed.

[0003] Bipolar instruments have great advantages due to their compact size and powerful closing function, and are mostly used in laparoscopic surgery. During laparoscopic surgery, closing instruments of different lengths are required due to operational requirements. However, the only drawback is that the blade of the bipolar instruments currently on the market cannot be adjusted in length, and doctors can only replace closing instruments of different specifications according to their needs during surgery, which is extremely inconvenient. In order to solve the above technical problems, the present invention is hereby developed. Summary of the invention

[0004] In view of at least one of the above-mentioned technical problems, the object of the present invention is to provide a bipolar vascular closure device with adjustable knife rod length. When the doctor operates the closure device during surgery, he can adjust the length of the knife rod according to the usage requirements without replacing the bipolar instrument, thereby greatly improving the surgical efficiency.

[0005] The technical solution of the present invention is:

[0006] The object of the present invention is to provide a bipolar blood vessel closing device with adjustable knife rod length, comprising a handle and a knife rod assembly, wherein a winding motor is arranged in the handle and a knife pushing trigger and a jaw closing trigger are arranged on the handle, wherein the knife rod assembly comprises a connecting rod with one end arranged in the handle and the other end connected to a jaw assembly, and a knife pushing rod movable assembly linked to the knife pushing trigger and a jaw closing rod movable assembly linked to the jaw closing trigger and arranged inside the connecting rod;

[0007] The connecting rod comprises a fixed tube and a movable tube coaxially sleeved, the fixed tube is located in the handle and fixed relative to the handle, the movable tube is passed through the fixed tube and one end of the movable tube contacts the touch switch on the winding motor, and the other end extends out of the handle and is fixed to the jaw assembly at the far end;

[0008] The knife-pushing rod movable assembly and the jaw closing rod movable assembly are axially parallel and arranged side by side inside the movable tube;

[0009] The knife rod assembly also includes a limit knob arranged on the handle and on the outer periphery of the fixed tube, and the limit knob can perform circumferential rotation around the fixed tube, so that the movable tube can switch between a first state in which it performs axial telescopic movement relative to the fixed tube and a second state in which it is fixed relative to the fixed tube.

[0010] Compared with the prior art, the advantages of the present invention are:

[0011] The bipolar vascular closure device with adjustable knife rod length of the present invention transforms the fixed connecting rod in the prior art into a telescopic length-adjustable connecting rod which is formed by a fixed tube and a movable tube and is unlocked or locked by a limit knob, so that the connecting rod connected to the jaw assembly can adjust the length of the knife rod by adjusting the extended length of the movable tube according to the length requirement when in use, thereby solving the problem in the prior art that doctors can only replace the instrument or the knife rod without replacing the instrument, reducing the types of specifications of bipolar instruments required in the same operation and greatly improving the doctor's operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of a bipolar blood vessel sealing device with adjustable blade rod length according to an embodiment of the present invention;

[0014] Figure 2 This is a schematic diagram of the structure of the bipolar vascular closure device with adjustable blade length according to an embodiment of the present invention, with part of the handle omitted;

[0015] Figure 3 for Figure 2 A partial enlarged structural diagram of the middle A part;

[0016] Figure 4 for Figure 3 A schematic diagram of the partial enlarged structure of the middle B part;

[0017] Figure 5 for Figure 3 A schematic diagram of the partially enlarged structure of the middle C part;

[0018] Figure 6 It is a structural schematic diagram of a fixed tube of a bipolar blood vessel sealing device with adjustable blade rod length according to an embodiment of the present invention;

[0019] Figure 7 It is a schematic structural diagram of the active tube of the bipolar blood vessel sealing device with adjustable blade rod length according to an embodiment of the present invention;

[0020] Figure 8 for Figure 7 A schematic diagram of the partial enlarged structure of the middle D part;

[0021] Fig. 9 It is a schematic structural diagram of a limit knob of a bipolar blood vessel sealing device capable of adjusting the length of a knife rod according to an embodiment of the present invention;

[0022] Fig.10 This is a schematic structural diagram of a bipolar blood vessel sealing device with adjustable blade length according to an embodiment of the present invention, with the handle and the movable tube omitted;

[0023] Fig.11 for Fig.10 A schematic diagram of the partial enlarged structure of the middle E part;

[0024] Fig.12 It is a schematic structural diagram of a stent of a bipolar blood vessel sealing device with adjustable blade rod length according to an embodiment of the present invention;

[0025] Fig.13 for Fig.12 A schematic diagram of the partial enlarged structure of the middle F part;

[0026] Fig.14 It is a structural schematic diagram of a knife-pushing rod movable assembly, a jaw closing rod movable assembly and a jaw assembly of a bipolar blood vessel sealing device with adjustable knife rod length according to an embodiment of the present invention;

[0027] Fig.15 for Fig.14 A schematic diagram of the partial enlarged structure of the middle G part;

[0028] Fig.16 for Fig.14 A schematic diagram of the partially enlarged structure of the middle H section;

[0029] Fig.17 It is a schematic diagram of the three-dimensional structure of the cylindrical pin of the bipolar blood vessel sealing device with adjustable blade rod length according to an embodiment of the present invention.

[0030] Among them: 1. handle; 11. winding motor; 111. upper motor shaft; 112. lower motor shaft; 113. touch switch; 12. jaw closing trigger; 121. closing connecting wire shaft; 1211. closing connecting wire groove; 13. push knife trigger; 131. push knife connecting wire shaft; 1311. push knife connecting wire groove; 14. first winding rod; 15. second winding rod; 2. knife rod assembly; 21. connecting rod; 211. fixed tube; 2111. first length adjustment groove; 21111. first axial section; 21112. first radial section; 2112. third wire outlet; 2113. limit sliding groove; 212. movable tube; 2121. second length adjustment groove; 21211. second axial section; 21212. second radial section; 2122 , first wire outlet hole; 2123, limiting protrusion; 231, limiting tube; 2311, limiting boss; 232, operating knob; 22, jaw assembly; 23, limiting knob; 24, bracket; 241, closing rod movable hole; 242, push knife rod movable hole; 243, fixing groove; 244, first wire groove; 245, second wire groove; 25, jaw closing rod movable assembly; 251, closing rod; 2511, second flange; 252, second spring; 253, closing connecting line; 26, push knife rod movable assembly; 260, push knife; 261, push knife rod; 2611, first flange; 262, first spring; 263, push knife connecting line; 27, cylindrical pin; 271, closing connecting line slide groove; 272, push knife connecting line slide groove. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention. Example

[0032] See also Figures 1 to 17 A bipolar vascular closure device with adjustable knife rod length according to an embodiment of the present invention comprises a handle 1 and a knife rod assembly 2, wherein the handle 1 is provided with a winding motor 11, a knife pushing trigger 13 and a jaw closing trigger 12. The knife rod assembly 2 comprises a connecting rod 21, a knife pushing rod movable assembly 26 arranged in the connecting rod 21 and linked with the knife pushing trigger 13, and a jaw closing rod movable assembly 25 linked with the jaw closing trigger 12. The connecting rod 21 comprises a fixed tube 211 and a movable tube 212 which are coaxially sleeved, the fixed tube 211 being located in the handle 1 and being fixed relative to the handle 1, the movable tube 212 being passed through the fixed tube 211 and having one end in contact with the touch switch 113 at the right end of the winding motor 11, and the other end extending out of the handle 1 and connected with the far end of the connecting rod 21, i.e. Figure 1 or Figure 2The jaw assembly 22 at the right end is fixed, for example, by welding. The pusher bar movable assembly 26 and the jaw closing rod movable assembly 25 are axially parallel and arranged side by side inside the movable tube 212 and close to one end of the jaw assembly 22. The knife bar assembly 2 also includes a limit knob 23 arranged on the handle 1 and arranged on the outer periphery of the fixed tube 211. The limit knob 23 can perform circumferential rotation around the fixed tube 211, so that the movable tube 212 can switch between a first state of axial telescopic movement relative to the fixed tube 211 and a second state of being fixed relative to the fixed tube 211. That is to say, the limit knob 23 can be used as an unlocking component for the movable tube 212 to perform axial telescopic movement relative to the fixed tube 211. In the embodiment of the present invention, the fixed connecting rod 21 in the prior art is transformed into a retractable length-adjustable connecting rod which is formed by a fixed tube 211 and a movable tube 212 and is unlocked or locked by a limit knob 23, so that the connecting rod 21 connected to the jaw assembly 22 can adjust the length of the knife rod by adjusting the extended length of the movable tube 212 according to the length requirement when in use, thereby solving the problem in the prior art that doctors can only replace instruments or knife rods, and there is no need to replace instruments, thereby reducing the types of specifications of bipolar instruments required for the same operation and greatly improving the doctor's operating efficiency.

[0033] According to some preferred embodiments of the present invention, Figures 6 to 8 As shown, a first length adjustment groove 2111 is formed on the wall surface of the fixed tube 211, and a second length adjustment groove 2121 is formed on the wall surface of the movable tube 212. The first length adjustment groove 2111 and the second length adjustment groove 2121 both include an axial section extending along the axial direction (for the convenience of distinction and description, the axial section of the first length adjustment groove 2111 is described as the first axial section 21111, and the axial section of the second length adjustment groove 2121 is described as the second axial section 21211) and at least two radial sections (in the embodiment of the present invention, as shown in FIG. 2 ) arranged at intervals along the extending direction of the axial section and connected to the axial section. Figure 6 and Figure 8 As shown, the number of radial segments is two and the two radial segments are respectively located at the two ends of the corresponding axial segments, that is, the first length adjustment groove 2111 and the second length adjustment groove 2121 are both in a bald treasure cover shape or a downward-opening Chinese character shape. For the convenience of distinction and description, the radial segment of the first length adjustment groove 2111 is described as the first radial segment 21112, and the radial segment of the second length adjustment groove 2121 is described as the second radial segment 21212), and the axial segments of the first length adjustment groove 2111 and the second length adjustment groove 2121, that is, the first axial segment 21111 and the second axial segment 21211, are equal in length. Fig. 9As shown, the limiting knob 23 has a limiting boss 2311 protruding radially inward. In the first state, the limiting boss 2311 is located in the axial sections of the fixed tube 211 and the movable tube 212, namely, the first axial section 21111 and the second axial section 21211. Since the axial telescopic movement of the movable tube 212 is consistent with the extension direction of the first axial section 21111 and the second axial section 21211, that is, there is no limiting boss 2311 to block it on the telescopic path of the movable tube 212, so the movable tube 212 can be telescopically moved relative to the fixed tube 211 in the axial direction to adjust the length of the connecting rod 21. In the second state, the limiting boss 2311 is located in the radial sections of the fixed tube 211 and the movable tube 212, namely, the first radial section 21112 and the second radial section 21212 to block the axial telescopic path of the movable tube 212. That is to say, the axial telescopic movement of the movable tube 212 is blocked by the interference of the first radial segment 21112 and the second radial segment 21212 and the limiting boss 2311, so the movable tube 212 is fixed in the axial direction relative to the fixed tube 211, thereby achieving the purpose of locking. As an alternative embodiment, the number of the first radial segment 21112 of the first length adjustment groove 2111 and the second radial segment 21212 of the second length adjustment groove 2121 is more than two, such as three, four, etc., and the spacing between any two adjacent first radial segments 21112 and the spacing between any two adjacent second radial segments 21212 are equal. The specific number is set according to the length specifications of the knife bar required during use. For example, if there are two specifications of the required knife bar length, only two radial segments need to be designed. When there are three specifications, three radial segments need to be designed.

[0034] According to some preferred embodiments of the present invention, Figures 6 to 8 As shown, a limiting slide groove 2113 extending along the axis direction of the fixed tube 211 is provided on the wall surface of the end close to the winding motor 11, that is, the left end. The limiting slide groove 2113 and the first length adjustment groove 2111 are on the same axis and there is a gap between them, that is, the right end of the limiting slide groove 2113 is not connected to the left end of the first length adjustment groove 2111. A sliding limiting protrusion 2123 protruding radially outward and slidingly cooperating with the limiting slide groove 2113 is provided on the outer wall of the end of the movable tube 212 in contact with the light touch switch 113. Preferably, the limiting slide groove 2113 runs through the end of the fixed tube 211 facing the winding motor 11, that is, the left end of the limiting slide groove 2113 runs through the left end of the fixed tube 211. Such a design facilitates the disassembly and assembly of the fixed tube 211 and the movable tube 212.

[0035] According to some preferred embodiments of the present invention, Figures 10 to 13As shown, a bracket 24 extending along the axial direction of the movable tube 212 is provided inside the end close to the jaw assembly 22, that is, the right end. Two movable holes are axially penetrated and spaced side by side in the bracket 24. One of the movable holes is a pusher rod movable hole 242 in which a pusher rod movable assembly 26 is movably arranged, and the other movable hole is a closing rod movable hole 241 in which a jaw closing rod movable assembly 25 is movably arranged. The bracket 24 is provided to facilitate the installation and fixation of the pusher rod movable assembly 26 and the jaw closing rod movable assembly 25, and to guide and limit the axial movement of each group of the two to prevent interference between the two.

[0036] According to some preferred embodiments of the present invention, Fig.17 As shown, the bracket 24 is provided with a cylindrical pin 27 arranged along its radial direction, and the outer wall of the cylindrical pin 27 is coaxially spaced apart with a push knife connection line slot 272 and a closed connection line slot 271. Figure 4 As shown, the push knife trigger 13 is provided with a push knife connecting wire groove 1311. Figure 5 As shown, the jaw closing trigger 12 is provided with a closing connection line groove 1211. Figures 14 to 16 As shown, the push knife rod movable assembly 26 includes a push knife rod 261, a first spring 262 and a push knife connecting line 263. The end of the push knife rod 261 close to the jaw assembly 22, i.e. the right end, is connected with a push knife 260, and the push knife 260 extends into the jaw assembly 22, and the end of the push knife rod 261 away from the jaw assembly 22, i.e. the left end, is provided with a first flange 2611, and the first flange 2611 is outside the left end of the bracket 24. The first spring 262 is sleeved on the end of the push knife rod 261 away from the jaw assembly 22, i.e. the part of the push knife rod 261 on the outside of the left end of the bracket 24, and one end thereof abuts against the first flange 2611, and the other end abuts against the bracket 24, specifically the left end face of the bracket 24. As shown Figure 3 to Figure 4 and Fig.10 , Fig.14 and Fig.15 As shown, one end of the push knife connecting wire 263 is connected to the push knife rod 261, and the other end bypasses the push knife connecting wire slot 272 to the right, then extends to the left and passes through the outlet holes opened on the movable tube 212 and the fixed tube 211, then bypasses the push knife connecting wire slot 1311 and is connected to the upper motor shaft 111 on the winding motor 11. Figures 14 to 16As shown, the jaw closing rod movable assembly 25 includes a closing rod 251, a second spring 252 and a closing connection line 253. The end of the closing rod 251 away from the handle 1, that is, the right end, extends into the jaw assembly 22 and is connected to the movable jaw of the jaw assembly 22 (the specific structure of the jaw assembly 22 and the connection method between the closing rod 251 and the jaw assembly 22 are not described or limited, and are the jaw assembly 22 structure of the existing conventional bipolar vascular closure device, which is not the inventive point of the present invention). The end of the closing rod 251 away from the jaw assembly 22, that is, the left end, is provided with a second flange 2511, and the second flange 2511 is located on the outside of the left end of the bracket 24. The second spring 252 is sleeved on the end of the closing rod 251 away from the jaw assembly 22, that is, the part of the closing rod 251 located on the outside of the left end of the bracket 24, and one end of the second spring abuts on the second flange 2511, and the other end abuts on the left end surface of the bracket 24. As shown in FIG. Figure 3 , Figure 5 , Fig.10 , Fig.14 and Fig.15 As shown, one end of the closing connection line 253 is connected to the closing rod 251, and the other end bypasses the closing connection line slot 271 to the right, and then extends to the left through the outlet holes opened on the movable tube 212 and the fixed tube 211, and then bypasses the closing connection line slot 1211 and is connected to the lower motor shaft 112 on the winding motor 11. Figure 4 As shown, the upper end of the push knife trigger 13 is passed through the outer side of the fixed tube 211 and is rotatably matched with the inner wall of the handle 1 through a push knife connecting wire shaft 131 arranged horizontally in front and behind. A first winding rod 14 is also provided above the push knife connecting wire shaft 131, and a push knife connecting wire groove 1311 is opened on the push knife connecting wire shaft 131. After the push knife connecting wire 263 comes out of the third wire outlet hole 2112, it passes vertically upward through the rear end of the push knife connecting wire groove 1311, that is, Figure 4 The right end of the motor 110 then goes around the first winding rod 14 and then extends horizontally to the left and is wound around and connected with the upper motor shaft 111. Figure 5 As shown, the upper end of the jaw closing trigger 12 is passed through the outer side of the fixed tube 211 and is rotated with the inner wall of the handle 1. A horizontal front-to-back closed connection line shaft 121 is provided on the left side wall of the jaw closing trigger 12. A closed connection line groove 1211 is provided on the closed connection line shaft 121, and a second winding rod 15 is provided at the lower left side of the closed connection line shaft 121. After the closed connection line 253 comes out of the fourth outlet hole, it passes vertically downward through the front end of the closed connection line groove 1211, that is, as shown in FIG. Figure 5The left end of the push knife connecting wire 263 then goes around the second winding rod 15 downwards and then extends horizontally to the left and is wound and connected with the lower motor shaft 112. Optionally, the push knife connecting wire 263 can also be wound around the push knife connecting wire groove 1311 once and then vertically go around the first winding rod 14 upwards and then connected with the upper motor shaft 111. Similarly, the closed connecting wire 253 can also be wound around the closed connecting wire groove 1211 once and then vertically go around the second winding rod 15 downwards and then connected with the lower motor shaft 112.

[0037] According to some preferred embodiments of the present invention, Fig.13 As shown, the bottom of the outer wall of the bracket 24 is provided with a fixing groove 243 for fixing the cylindrical pin 27 and two wire grooves extending from the fixing groove 243 along the axis direction of the bracket 24 to the end of the bracket 24 close to the handle 1, that is, the left end, which are respectively matched with the appearance and size of the push knife connecting line 263 and the closed connecting line 253 (for the convenience of distinction and description, the wire groove corresponding to the closed connecting line 253 is the first wire groove 244, and the wire groove corresponding to the push knife connecting line 263 is the second wire groove 245). The setting of the wire groove facilitates the guidance and limitation of the closed connecting line 253 and the push knife connecting line 263, so that the two are separated from each other to avoid interference or even entanglement between the two.

[0038] According to some preferred embodiments of the present invention, Figures 7 and 8 As shown, the wire outlet holes on the movable tube 212 include a first wire outlet hole 2122 for the push knife connecting wire 263 to pass through and a second wire outlet hole (not shown) for the closing connecting wire 253 to pass through. Figure 6 As shown, the outlet holes on the fixed tube 211 include a third outlet hole 2112 for the push knife connecting wire 263 to pass through and a fourth outlet hole (not shown) for the closing connecting wire 253 to pass through. The first outlet hole 2122 and the second outlet hole are both bar holes extending along the axis direction of the movable tube 212, and the third outlet hole 2112 and the fourth outlet hole are circular outlet holes with a larger aperture than the push knife connecting wire 263 and the closing connecting wire 253. Since the axial position of the movable tube 212 relative to the fixed tube 211 will change when the length of the knife rod is adjusted, it is necessary to set the outlet holes as through holes extending along the axis direction of the movable tube 212, while the position of the fixed tube 211 will not change, so it is only necessary to set the third outlet hole 2112 and the fourth outlet hole as circular holes with a larger aperture than the push knife connecting wire 263 and the closing connecting wire 253. Preferably, in order to facilitate the connection between the push knife connection line 263 and the upper motor shaft 111 and the connection between the closing connection line 253 and the lower motor shaft 112 and to avoid interference caused by the outlet lines of the push knife connection line 263 and the closing connection line 253, the first outlet hole 2122 and the second outlet hole are set on the upper and lower sides of the axis of the movable tube 212 and are staggered, and the third outlet hole 2112 and the fourth outlet hole are set on the upper and lower sides of the axis of the fixed tube 211 and are staggered. Specifically, as Figure 8As shown, the first outlet hole 2122 is opened on the upper side wall of the movable tube 212, and the second outlet hole is opened on the lower side wall of the movable tube 212 and the second outlet hole is to the left of the first outlet hole 2122. Figure 6 As shown, the third wire outlet hole 2112 is opened on the upper side wall of the fixed tube 211 , and the fourth wire outlet hole is opened on the lower side wall of the fixed tube 211 and is located to the left of the third wire outlet hole 2112 .

[0039] According to some preferred embodiments of the present invention, Fig. 9 As shown, the limit knob 23 includes a limit tube 231 sleeved on the outer periphery of the fixed tube 211 and an operating knob 232 fixed on the outer wall of the limit tube 231. The limit tube 231 is rotatably matched with the fixed tube 211. The limit boss 2311 is arranged on the inner wall of the limit tube 231, and the outer peripheral surface of the operating knob 232 is formed with a concave-convex structure. It is convenient for the operator to hold and grasp, so that the operator can save effort when twisting the knob.

[0040] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A bipolar vascular closure device with adjustable knife bar length, comprising a handle and a knife bar assembly, wherein a winding motor is arranged in the handle and a knife push trigger and a jaw closing trigger are arranged on the handle, wherein the knife bar assembly comprises a connecting rod with one end arranged in the handle and the other end connected to a jaw assembly, and a knife push rod movable assembly linked to the knife push trigger and a jaw closing rod movable assembly linked to the jaw closing trigger and arranged inside the connecting rod; characterized in that: The connecting rod comprises a fixed tube and a movable tube coaxially sleeved, the fixed tube is located in the handle and fixed relative to the handle, the movable tube is passed through the fixed tube and one end of the movable tube contacts the touch switch on the winding motor, and the other end extends out of the handle and is fixed to the jaw assembly at the far end; The knife-pushing rod movable assembly and the jaw closing rod movable assembly are axially parallel and arranged side by side inside the movable tube; The knife bar assembly further comprises a limit knob disposed on the handle and disposed on the outer circumference of the fixed tube, wherein the limit knob can perform circumferential rotational movement around the fixed tube, so that the movable tube can switch between a first state in which the movable tube performs axial telescopic movement relative to the fixed tube and a second state in which the movable tube is fixed relative to the fixed tube; A first length adjustment groove is formed on the wall surface of the fixed tube, and a second length adjustment groove is formed on the wall surface of the movable tube; The first length adjustment groove and the second length adjustment groove each include an axial section extending along the axial direction and at least two radial sections spaced apart in the extending direction of the axial section and connected to the axial section, and the axial sections of the first length adjustment groove and the second length adjustment groove are equal in length; The limit knob has a limit boss protruding radially inward; In the first state, the limiting boss is located in the axial section of the fixed tube and the movable tube; in the second state, the limiting boss is located in the radial section of the fixed tube and the movable tube to block the axial telescopic path of the movable tube.

2. The bipolar vascular sealing device with adjustable blade length according to claim 1, characterized in that: A limiting sliding groove extending along the axis direction of the fixed tube is provided on the wall surface of one end of the fixed tube close to the winding motor, and the limiting sliding groove and the first length adjustment groove are located on the same axis and there is a distance between them; A sliding limiting protrusion which radially protrudes outward and slidably cooperates with the limiting sliding groove is arranged on the outer wall of the end of the movable tube which contacts the light touch switch.

3. The bipolar vascular closure device with adjustable blade length according to claim 2, characterized in that: The limiting sliding groove passes through one end of the fixed tube facing the winding motor.

4. The bipolar vascular sealing device with adjustable blade length according to any one of claims 1 to 3, characterized in that: A bracket extending along the axial direction of the movable tube is provided inside one end of the movable tube close to the jaw assembly, and two movable holes axially penetrating and spaced side by side are opened in the bracket, one of the movable holes is a push-knife rod movable hole, and the push-knife rod movable assembly is movably arranged in it, and the other movable hole is a closing rod movable hole, and the jaw closing rod movable assembly is movably arranged in it.

5. The bipolar vascular sealing device with adjustable blade length according to claim 4, characterized in that: The bracket is provided with a cylindrical pin arranged along its radial direction, the outer wall of the cylindrical pin is coaxially spaced with a push knife connection line slide groove and a closing connection line slide groove, the push knife trigger is provided with a push knife connection line groove, and the jaw closing trigger is provided with a closing connection line groove; The push-knife rod movable assembly comprises a push-knife rod, a first spring and a push-knife connecting line; A push knife is connected to one end of the push knife rod close to the jaw assembly, the push knife extends into the jaw assembly, and a first flange is provided at one end of the push knife rod away from the jaw assembly; The first spring is sleeved on one end of the knife-pushing rod away from the jaw assembly, one end of the first spring abuts against the first flange, and the other end abuts against the bracket; One end of the push knife connecting wire is connected to the push knife rod, and the other end is connected to the upper motor shaft on the winding motor after passing through the push knife connecting wire slide groove, passing through the outlet holes provided on the movable tube and the fixed tube, passing through the push knife connecting wire groove; The jaw closing rod movable assembly includes a closing rod, a second spring and a closing connecting line; One end of the closing rod away from the handle extends into the jaw assembly and is connected to the movable jaw of the jaw assembly, and one end of the closing rod away from the jaw assembly is provided with a second flange; The second spring is sleeved on an end of the closing rod away from the jaw assembly, with one end of the second spring abutting against the second flange and the other end abutting against the bracket; One end of the closed connection line is connected to the closing rod, and the other end passes through the closed connection line slide groove, passes through the outlet holes opened on the movable tube and the fixed tube, passes through the closed connection line groove, and then is connected to the lower motor shaft on the winding motor.

6. The bipolar vascular sealing device with adjustable blade length according to claim 5, characterized in that: The bottom of the outer wall of the bracket is provided with a fixing groove for fixing the cylindrical pin and two wire grooves extending from the fixing groove along the axial direction of the bracket to one end of the bracket close to the handle, which respectively match the shapes and sizes of the push knife connecting line and the closed connecting line.

7. The bipolar blood vessel sealing device with adjustable blade length according to claim 5, characterized in that: The wire outlet holes on the movable tube include a first wire outlet hole for the push knife connecting wire to pass through and a second wire outlet hole for the closing connecting wire to pass through; The wire outlet holes on the fixed tube include a third wire outlet hole for the push knife connecting wire to pass through and a fourth wire outlet hole for the closing connecting wire to pass through; The first and second wire outlet holes are both strip holes extending along the axis of the movable tube, and the third and fourth wire outlet holes are circular wire outlet holes with a larger aperture than that of the push knife connecting line and the closed connecting line.

8. The bipolar blood vessel sealing device with adjustable blade length according to claim 7, characterized in that: The first wire outlet hole and the second wire outlet hole are arranged on upper and lower sides of the axis of the movable tube and are staggered; and / or The third wire outlet hole and the fourth wire outlet hole are arranged on upper and lower sides of the axis of the fixed pipe and are staggered.

9. The bipolar blood vessel sealing device with adjustable blade length according to any one of claims 1 to 3, characterized in that: The limit knob comprises a limit tube sleeved on the outer periphery of the fixed tube and an operating knob fixed on the outer wall of the limit tube; The limiting boss is arranged on the inner wall of the limiting tube, and the outer peripheral surface of the operating knob is formed with a concave-convex alternating structure.

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