Inferior vena cava root blood vessel dissecting and separating forceps for liver surgical operation

Abstract

The invention relates to the field of operating forceps, in particular to a pair of inferior vena cava root blood vessel dissecting and separating forceps for liver surgery, which comprises a forceps body and a tube body, and a pull rod is arranged in the tube body; a first supporting seat is fixedly connected to the inner wall of the pipe body, a transmission fluted disc is rotationally connected to the first supporting seat, a hollow telescopic rod is fixedly connected to the middle of the transmission fluted disc, the other end of the telescopic rod is connected with the clamp body, and the pull rod penetrates through the telescopic rod and drives the clamp body to clamp by pulling; the inner wall of the pipe body is fixedly connected with a second supporting seat, the middle section of the pull rod is of a sawtooth flexible strip structure, and the second supporting seat is provided with a lock hole used for clamping the sawtooth flexible strip structure in a one-way mode and first lock teeth. The inner wall of the pipe body is slidably connected with a ratchet bar, the pull rod is provided with second locking teeth for unidirectionally clamping the ratchet bar, and a driving part is arranged at the end, close to the transmission fluted disc, of the ratchet bar. According to the technical scheme, the clamp body can be controlled to clamp by pulling out the pull rod, the clamp body can be controlled to rotate by pulling back the pull rod, hand operation is optimized, and control performance is improved.

Description

Technical Field

[0001] The present invention relates to the field of surgical forceps, and particularly to a vascular anatomical separation forceps for the root of the inferior vena cava in liver surgery. Background Art

[0002] During liver surgery, it is often necessary to separate and ligate one or two hepatic veins to cut off the blood flow out of the liver in this area. At present, there is no special separation forceps for separating the blood vessels at the root of the vena cava in clinical practice. Instead, large thoracic separation forceps or right-angle vascular forceps are often used. Due to the particularity and importance of the anatomical position of the root of the inferior vena cava, neither of the above replacement instruments is satisfactory in terms of the convenience and safety of the operator. It is not convenient for medical staff to hold and operate, and it is not convenient for resetting after operation. It is not convenient for the rotation operation of the forceps head under the condition of ensuring that the operator's wrist does not rotate, and it is also not convenient for the rotation operation adjustment.

[0003] In the prior art, for example, Patent Publication No. CN109009328B discloses a vascular anatomical separation forceps for the root of the inferior vena cava in liver surgery. By pulling out and rotating the pull rod, the clamping and rotation of the forceps body are respectively controlled, realizing the clamping and rotation by using fingers without the intervention of joints. However, the pulling out and rotation of the pull rod are controlled by the index finger and middle finger. Due to the constraint of the fingers by holding the forceps handle, and the further compression of the operability of the finger joints by pulling out the pull rod, the finger operation is relatively rigid and awkward. Therefore, an optimized vascular anatomical separation forceps for the root of the inferior vena cava in liver surgery is needed. Summary of the Invention

[0004] To solve the above problems, the present invention provides a vascular anatomical separation forceps for the root of the inferior vena cava in liver surgery, which can control the clamping of the forceps body by pulling out the pull rod and control the rotation of the forceps body by retracting the pull rod, optimizing the hand operation and improving the control performance.

[0005] To achieve the above object, the technical solution of the present invention is as follows: A vascular anatomical separation forceps for the root of the inferior vena cava in liver surgery, comprising a forceps body and a tube body, and a pull rod is provided inside the tube body; A first support seat is fixedly connected to the inner wall of the tube body. A transmission gear disc is rotatably connected to the first support seat. A hollow telescopic rod is fixedly connected to the middle of the transmission gear disc. The telescopic rod passes through the first support seat and extends to the forceps body and is fixedly connected to the forceps body. The pull rod passes through the transmission gear disc and the first support seat and extends to the forceps body and is rotatably connected to the forceps body. The pull rod is used to drive the forceps body to clamp by pulling; A second support seat is fixedly connected to the inner wall of the tube body. The middle section of the pull rod is a serrated flexible strip structure. A lock hole is provided on the second support seat. The serrated flexible strip structure is located in the lock hole. A first lock tooth for unidirectionally engaging and locking the serrated flexible strip structure is provided in the lock hole. The first lock tooth is used to lock the serrated flexible strip structure when the serrated flexible strip structure moves towards the forceps body direction; A ratchet rack is slidably connected to the inner wall of the tube body. A second locking tooth for unidirectionally engaging with the ratchet rack is provided on the pull rod. The second locking tooth is used to lock the ratchet rack when the pull rod moves towards the pliers body. A driving member is provided at one end of the ratchet rack close to the transmission gear disc. The driving member is used to drive the transmission gear disc to rotate by utilizing the sliding movement of the ratchet rack.

[0006] The following beneficial effects are achieved by adopting the above solution: 1. In this solution, the user holds the tube body and uses the pliers body to perform vascular dissection and separation. When the pliers body reaches the blood vessel position, the pliers body is driven to clamp by pulling the pull rod. During this process, the serrated flexible strip structure will be straightened to conduct the pulling force, and the part of the serrated flexible strip structure passing through the locking hole will be locked by the first locking tooth, so that the serrated flexible strip structure cannot retract. Therefore, after driving the pliers body to clamp, even if the pull rod is released, the pliers body will not open, thus completing self-locking.

[0007] 2. In this solution, after driving the pliers body to clamp, the pull rod is pushed back. At this time, since the serrated flexible strip structure is locked, the serrated flexible strip structure will not retract into the locking hole when the pull rod is pushed back, but will form a bend in front of the locking hole, always keeping the pliers body in a clamped state. And the second locking tooth will lock with the ratchet rack, so that when the pull rod is pushed back, it will drive the ratchet rack to slide, and the driving member will transmit the sliding of the ratchet rack to the rotation of the transmission gear disc, and the transmission gear disc will transmit the rotation through the telescopic rod to make the pliers body rotate.

[0008] 3. In this solution, the user can control the pulling and pushing back of the pull rod through the middle finger and the index finger. When pulling, the middle finger and the index finger clamp the pull rod and then bend to pull out the pull rod. When pushing back, the middle finger and the index finger are relaxed to drive the pull rod to push back. Compared with controlling the rotation of the pull rod after the fingers are bent in the prior art, the bending and relaxation of the fingers are more adaptable to the human body structure, and there will be no situation of awkward joints, which is more convenient for controlling the pliers body.

[0009] Furthermore, the driving member includes a third support seat. The third support seat is fixedly connected to the inner wall of the tube body. A nut seat is rotatably connected to the third support seat. A tooth pattern meshing with the transmission gear disc is sleeved and fixedly connected to the outer side of the nut seat. One end of the ratchet rack close to the transmission gear disc is rotatably connected to a lead screw. The lead screw is matched with the nut seat. The end of the lead screw away from the ratchet rack passes through the third support seat.

[0010] Beneficial effect: After the ratchet rack slides, it will drive the lead screw to move towards the nut seat and drive the nut seat to rotate. The rotation of the nut seat drives the transmission gear disc to rotate, and the transmission gear disc then makes the pliers body rotate through the telescopic rod.

[0011] Further, the pliers body includes a first pliers head, a second pliers head, a rotating frame and a receiving frame. A rotating shaft is rotatably connected to the receiving frame. The rotating frame is rotatably connected to the pipe body. The rotating frame is fixedly connected with an extension plate. A pin shaft is rotatably connected to the extension plate. The first pliers head and the second pliers head are hinged to each other through the pin shaft. Transmission rods are rotatably connected to the tails of the first pliers head and the second pliers head. One ends of the transmission rods away from the first pliers head and the second pliers head are rotatably connected to the rotating shaft. The telescopic rod is fixedly connected to the receiving frame, and the pull rod is rotatably connected to the receiving frame.

[0012] Beneficial effects: When the pull rod is driven, the receiving frame will move accordingly. At this time, the tails of the first pliers head and the second pliers head will be brought closer by the transmission rods, driving the pliers body to contract.

[0013] Further, the telescopic rod includes a mother cylinder and a son cylinder. The son cylinder is slidably connected to the inner wall of the mother cylinder. A plurality of reinforcing rods are fixedly connected to the outer wall of the mother cylinder. One ends of the reinforcing rods away from the mother cylinder are fixedly connected to the rotating frame.

[0014] Beneficial effects: The reinforcing rods can strengthen the mechanical structure, transfer the rotation of the telescopic rod to the rotating frame, and drive the entire rotating frame to rotate.

[0015] Further, a finger sleeve ring is fixedly connected to one end of the pipe body away from the pliers body.

[0016] Beneficial effects: The user can insert one or more of the ring finger or little finger into the finger sleeve ring for grasping.

[0017] Further, a clamping pad is provided at one end of the pull rod away from the pliers body. The clamping pad is made of a material with a high coefficient of friction.

[0018] Beneficial effects: The clamping pad can facilitate the user to clamp the pull rod. The material with a high coefficient of friction can enhance the friction force when pulling or pushing back.

[0019] Further, a first spring switch is provided on the pipe body. The first spring switch is used to control the retraction and ejection of the first locking tooth.

[0020] Beneficial effects: Since the first locking tooth locks the serrated flexible strip structure, when loosening the pliers body, the first locking tooth needs to be retracted to release the serrated flexible strip structure and loosen the pliers body.

[0021] Further, a second spring switch is provided on the pull rod. The second spring switch is used to control the retraction and ejection of the second locking tooth.

[0022] Beneficial effects: Since the second locking tooth locks the ratchet rack, when resetting the ratchet rack, the second locking tooth needs to be retracted to release the ratchet rack and reset the ratchet rack.

[0023] Further, a locking buckle for locking the position of the pull rod is fixedly connected to the pipe body.

[0024] Beneficial effects: After the rotation adjustment of the pliers body is completed, the ratchet rack is not self-locking and can still change its position with the pulling or pushing back of the pull rod. The locking buckle can lock the pull rod, thereby fixing the rotation angle.

[0025] Furthermore, the length of the tube body is 18 cm to 25 cm.

[0026] Beneficial effects: The appropriate length setting enables the user to conveniently insert the pliers body into the abdominal cavity and facilitates the user's operation.

[0027] The additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0028] Figure 1 It is an axonometric schematic diagram of an embodiment of the vascular anatomical separation forceps for the root of the inferior vena cava in liver surgery according to the present invention; Figure 2 It is an internal structure schematic diagram of an embodiment of the vascular anatomical separation forceps for the root of the inferior vena cava in liver surgery according to the present invention; Figure 3 It is Figure 2 an enlarged schematic diagram of part A in Figure 4 It is Figure 2 a sectional view schematic diagram of part A in

[0029] The reference numerals in the accompanying drawings of the specification include: 1, pliers body; 2, tube body; 3, pull rod; 4, first support seat; 5, transmission gear disc; 6, telescopic rod; 7, second support seat; 8, serrated flexible strip structure; 9, ratchet rack; 10, second locking tooth; 11, third support seat; 12, nut seat; 13, lead screw; 14, first pliers head; 15, second pliers head; 16, rotating frame; 17, receiving frame; 18, mother cylinder; 19, sub-cylinder; 20, strengthening rod; 21, finger ring; 22, clamping pad; 23, first spring switch; 24, second spring switch; 25, locking buckle. Detailed Embodiments

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The following is a further detailed description through specific embodiments: As shown in the Figures 1-4 accompanying drawings: A vascular dissection forceps for the root of the inferior vena cava in liver surgery includes a forceps body 1 and a tube body 2. A pull rod 3 is provided inside the tube body 2, and the pull rod 3 is slidably connected to the tube body 2.

[0034] The forceps body 1 includes a first forceps head 14, a second forceps head 15, a rotating frame 16, and a receiving frame 17. A rotating shaft is rotatably connected to the receiving frame 17. The rotating frame 16 is rotatably connected to the tube body 2. An extension plate is welded and fixed to the rotating frame 16. A pin shaft is rotatably connected to the extension plate. The first forceps head 14 and the second forceps head 15 are hinged to each other through the pin shaft. Transmission rods are rotatably connected to the tails of the first forceps head 14 and the second forceps head 15. The ends of the transmission rods away from the first forceps head 14 and the second forceps head 15 are rotatably connected to the rotating shaft.

[0035] A first support seat 4 is integrally formed on the inner wall of the tube body 2. A transmission gear disk 5 is rotatably connected to the first support seat 4. A hollow telescopic rod 6 is welded and fixed to the middle of the transmission gear disk 5. The telescopic rod 6 passes through the first support seat 4 and extends to the forceps body 1 and is fixed to the receiving frame 17 by screws. The pull rod 3 passes through the transmission gear disk 5 and the first support seat 4 and extends to the forceps body 1 and is rotatably connected to the receiving frame 17. The pull rod 3 is used to drive the forceps body 1 to clamp by pulling.

[0036] A second support base 7 is fixedly connected to the inner wall of the pipe body 2. The middle section of the pull rod 3 is a serrated flexible strip structure 8. A lock hole is provided on the second support base 7. The serrated flexible strip structure 8 is located in the lock hole. A first lock tooth for unidirectionally engaging and locking the serrated flexible strip structure 8 is installed in the lock hole. The first lock tooth is used to lock the serrated flexible strip structure 8 when the serrated flexible strip structure 8 moves towards the pliers body 1 direction.

[0037] A ratchet rack 9 is slidably connected to the inner wall of the pipe body 2. A second lock tooth 10 for unidirectionally engaging and locking the ratchet rack 9 is provided on the pull rod 3. The second lock tooth 10 is used to lock the ratchet rack 9 when the pull rod 3 moves towards the pliers body 1 direction. A driving member is provided at one end of the ratchet rack 9 close to the transmission gear disk 5. The driving member is used to drive the transmission gear disk 5 to rotate by utilizing the sliding movement of the ratchet rack 9.

[0038] The driving member includes a third support base 11. The third support base 11 is integrally formed with the inner wall of the pipe body 2. A nut seat 12 is rotatably connected to the third support base 11. A tooth pattern meshing with the transmission gear disk 5 is sleeved and fixedly connected to the outer side of the nut seat 12. One end of the ratchet rack 9 close to the transmission gear disk 5 is rotatably connected to a lead screw 13. The lead screw 13 cooperates with the nut seat 12. The end of the lead screw 13 away from the ratchet rack 9 passes through the third support base 11.

[0039] During use, the user holds the pipe body 2 and uses the pliers body 1 to perform vascular dissection and separation. When the pliers body 1 reaches the position of the blood vessel, the pliers body 1 is driven to clamp by pulling the pull rod 3. During this process, the serrated flexible strip structure 8 will be straightened and conduct the pulling force, so that the receiving bracket 17 is pulled, causing the first pliers head 14 and the second pliers head 15 to clamp. And the part of the serrated flexible strip structure 8 passing through the lock hole will be locked by the first lock tooth, so that the serrated flexible strip structure 8 cannot retract. Therefore, after driving the pliers body 1 to clamp, even if the pull rod 3 is released, the pliers body 1 will not loosen, thus completing self-locking.

[0040] After driving the pliers body 1 to clamp, the pull rod 3 is pushed back. At this time, since the serrated flexible strip structure 8 is locked, the serrated flexible strip structure 8 will not retract into the lock hole when the pull rod 3 is pushed back, but forms a bend in front of the lock hole, always keeping the pliers body 1 in a clamped state. And the second lock tooth 10 will lock with the ratchet rack 9, so that the ratchet rack 9 slides when the pull rod 3 is pushed back. After the ratchet rack 9 slides, it will drive the lead screw 13 to move towards the nut seat 12 direction and drive the nut seat 12 to rotate. The nut seat 12 rotates to drive the transmission gear disk 5 to rotate. The transmission gear disk 5 then makes the pliers body 1 rotate through the telescopic rod 6. The transmission gear disk 5 will conduct rotation through the telescopic rod 6 to make the pliers body 1 rotate. The user can adjust the rotation angle of the pliers body 1 to facilitate the user to separate the blood vessel.

[0041] The user can control the pulling and pushing back of the pull rod 3 through the middle finger and the index finger. When pulling, the middle finger and the index finger clamp the pull rod 3 and then bend to pull out the pull rod 3. When pushing back, the middle finger and the index finger relax to drive the pull rod 3 to push back. Compared with controlling the rotation of the pull rod 3 after the fingers are bent in the prior art, the bending and relaxation of the fingers are more adaptable to the human body structure, and there will be no situation where the joints are awkward, which is more convenient for controlling the pliers body 1.

[0042] The telescopic rod 6 includes a mother cylinder 18 and a son cylinder 19. The son cylinder 19 is slidably connected to the inner wall of the mother cylinder 18. A plurality of reinforcing rods 20 are adhesively fixed to the outer wall of the mother cylinder 18. One end of the reinforcing rod 20 far from the mother cylinder 18 is adhesively fixed to the rotating frame 16.

[0043] The reinforcing rod 20 can strengthen the mechanical structure, transfer the rotation of the telescopic rod 6 to the rotating frame 16, and drive the entire rotating frame 16 to rotate.

[0044] One end of the pipe body 2 far from the pliers body 1 is integrally formed with a finger ring 21.

[0045] The user can insert one or more of the ring finger or the little finger into the finger ring 21 for grasping.

[0046] One end of the pull rod 3 far from the pliers body 1 is adhesively fixed with a clamping pad 22. The clamping pad 22 is made of a material with a high coefficient of friction.

[0047] The clamping pad 22 can facilitate the user to clamp the pull rod 3, and the material with a high coefficient of friction can enhance the friction force when pulling or pushing back.

[0048] A first spring switch 23 is provided on the pipe body 2. The first lock tooth is movably connected to the second support seat 7. The first lock tooth is fixedly connected to the trigger end of the first spring switch 23. The first spring switch 23 is used to control the retraction and ejection of the first lock tooth.

[0049] Since the first lock tooth locks the sawtooth flexible strip structure 8, when loosening the pliers body 1, it is necessary to retract the first lock tooth to release the sawtooth flexible strip structure 8 and loosen the pliers body 1.

[0050] A second spring switch 24 is provided on the pull rod 3. The second lock tooth 10 is movably connected to the pull rod 3. The second lock tooth 10 is fixedly connected to the trigger end of the second spring switch 24. The second spring switch 24 is used to control the retraction and ejection of the second lock tooth 10.

[0051] Since the second lock tooth 10 locks the ratchet bar 9, when resetting the ratchet bar 9, it is necessary to retract the second lock tooth 10 to release the ratchet bar 9 and reset the ratchet bar 9.

[0052] A locking buckle 25 for locking the position of the pull rod 3 is fixedly connected to the pipe body 2.

[0053] After the rotation adjustment of the pliers body 1 is completed, the ratchet rack 9 is not self-locking and can still change its position with the pulling or pushing back of the pull rod 3. The locking buckle 25 can lock the pull rod 3.

[0054] The length of the tube body 2 is 18 cm to 25 cm.

[0055] The appropriate length setting can facilitate the user to insert the pliers body 1 into the abdominal cavity and facilitate the user's operation.

[0056] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A vascular dissection forceps for the root of the inferior vena cava in liver surgery, characterized in that, It includes a pliers body (1) and a tube body (2), and a pull rod (3) is arranged inside the tube body (2); A first support seat (4) is fixedly connected to the inner wall of the tube body (2). A transmission gear disk (5) is rotatably connected to the first support seat (4). A hollow telescopic rod (6) is fixedly connected to the middle of the transmission gear disk (5). The telescopic rod (6) passes through the first support seat (4) and extends to the pliers body (1) and is fixedly connected to the pliers body (1). The pull rod (3) passes through the transmission gear disk (5) and the first support seat (4) and extends to the pliers body (1) and is rotatably connected to the pliers body (1). The pull rod (3) is used to pull and drive the pliers body (1) to clamp; A second support seat (7) is fixedly connected to the inner wall of the tube body (2). The middle section of the pull rod (3) is a serrated flexible strip structure (8). A lock hole is formed in the second support seat (7). The serrated flexible strip structure (8) is located in the lock hole. A first lock tooth for unidirectionally engaging with the serrated flexible strip structure is arranged in the lock hole. The first lock tooth is used to lock the serrated flexible strip structure (8) when the serrated flexible strip structure (8) moves towards the pliers body (1); A ratchet rack (9) is slidably connected to the inner wall of the tube body (2). A second lock tooth (10) for unidirectionally engaging with the ratchet rack (9) is arranged on the pull rod (3). The second lock tooth (10) is used to lock the ratchet rack (9) when the pull rod (3) moves towards the pliers body (1). A driving member is arranged at one end of the ratchet rack (9) close to the transmission gear disk (5). The driving member is used to drive the transmission gear disk (5) to rotate by using the sliding movement of the ratchet rack (9).

2. The vena cava root vascular anatomical separation forceps for liver surgery according to claim 1, wherein The driving member includes a third support seat (11). The third support seat (11) is fixedly connected to the inner wall of the tube body (2). A nut seat (12) is rotatably connected to the third support seat (11). A tooth pattern meshing with the transmission gear disk (5) is sleeved and fixedly connected to the outer sleeve of the nut seat (12). A lead screw (13) is rotatably connected to one end of the ratchet rack (9) close to the transmission gear disk (5). The lead screw (13) cooperates with the nut seat (12). The end of the lead screw (13) away from the ratchet rack (9) passes through the third support seat (11).

3. The vena cava root vascular dissection forceps for liver surgery according to claim 2, wherein, The pliers body (1) includes a first pliers head (14), a second pliers head (15), a rotating frame (16) and a receiving frame (17). A rotating shaft is rotatably connected to the receiving frame (17). The rotating frame (16) is rotatably connected to the tube body (2). The rotating frame (16) is fixedly connected with an extension plate. A pin shaft is rotatably connected to the extension plate. The first pliers head (14) and the second pliers head (15) are hinged to each other through the pin shaft. Transmission rods are rotatably connected to the tails of the first pliers head (14) and the second pliers head (15). The ends of the transmission rods away from the first pliers head (14) and the second pliers head (15) are both rotatably connected to the rotating shaft; The telescopic rod (6) is fixedly connected to the receiving frame (17). The pull rod (3) is rotatably connected to the receiving frame (17).

4. The inferior vena cava root vascular dissection forceps for liver surgery according to claim 3, wherein, The telescopic rod (6) includes a mother cylinder (18) and a son cylinder (19). The son cylinder (19) is slidably connected to the inner wall of the mother cylinder (18). A plurality of reinforcing rods (20) are fixedly connected to the outer wall of the mother cylinder (18). The ends of the reinforcing rods (20) away from the mother cylinder (18) are fixedly connected to the rotating frame (16).

5. The inferior vena cava root vascular dissection forceps for liver surgery according to claim 4, characterized in that, A finger ring (21) is fixedly connected to one end of the tube body (2) away from the pliers body (1).

6. The inferior vena cava root vascular dissection forceps for liver surgery according to claim 5, characterized in that, One end of the pull rod (3) away from the pliers body (1) is provided with a clamping pad (22), and the clamping pad (22) is made of a material with a high coefficient of friction.

7. The vena cava root vascular dissection forceps for liver surgery according to claim 6, wherein, A first spring switch (23) is provided on the pipe body (2), and the first spring switch (23) is used to control the retraction and ejection of the first locking tooth.

8. The vena cava root vascular dissection forceps for liver surgery according to claim 7, wherein, A second spring switch (24) is provided on the pull rod (3), and the second spring switch (24) is used to control the retraction and ejection of the second locking tooth (10).

9. The vena cava root vascular dissection forceps for liver surgery according to claim 8, characterized in that, A locking buckle (25) for locking the position of the pull rod (3) is fixedly connected to the pipe body (2).

10. The vena cava root vascular dissection forceps for liver surgery according to claim 9, characterized in that, The length of the pipe body (2) is 18 cm to 25 cm.

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