Double cannula knife great saphenous vein harvesting device

Abstract

The present invention relates to the technical field of medical instruments. Disclosed is a double cannula knife great saphenous vein harvesting device, comprising a handle, a cannula knife, and a protective cannula. The protective cannula is arranged inside the cannula knife and passes through the handle. A driving mechanism is arranged inside the handle to drive the cannula knife to move relative to the handle. A threading cylinder is fixedly mounted at the top end of the handle. One end of the protective cannula extends into the interior of the protective cannula, and a first fixing mechanism for fixing a guide wire is arranged in the threading cylinder. One end of the guide wire inside the threading cylinder can be fixed by means of the first fixing mechanism in the present invention, preventing the movement of the guide wire relative to the protective cannula, which ensures that the guide wire can better position the cannula knife, allowing for more precise movement of the cannula knife during tissue cutting and further avoiding accidental vascular injury. The arrangement of the first fixing mechanism enables the fixation of the guide wire to be more convenient, reducing surgical complexity and improving ease of use.

Description

A double-trocar knife great saphenous vein collection device Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a double-trocar knife great saphenous vein harvesting device. Background Art

[0002] During bypass surgery, a graft (target vessel) must be harvested from the patient's body. Currently, the great saphenous vein or radial artery is usually selected. In traditional surgery, the skin and muscle tissue must be completely peeled off, and the target vessel and the side branch vessels must be separated under direct vision. The surgery generally requires an incision on the patient's leg or arm that is the same length as the target vessel, usually 20-25 cm. The patient suffers from severe intraoperative trauma, a long postoperative recovery time, a high chance of infection, intense and prolonged pain, and obvious scars after recovery. Minimally invasive endoscopic vessel harvesting systems can now help doctors perform minimally invasive surgery on the legs or arms. Doctors only need to make one to two small incisions of 1-2 cm on the patient's legs or forearms to easily remove the target vessel. This method causes very little intraoperative trauma to the patient, reduces the chances of infection and complications, reduces pain, shortens postoperative recovery time, and is more aesthetically pleasing.

[0003] Chinese patent CN106943175A discloses a minimally invasive great saphenous vein harvesting device, wherein a vascular protection sleeve is inserted into a sleeve cutter, which is inserted into a tissue fixation sleeve; a first gear at the rear end of the sleeve cutter is located outside the rear end of the tissue fixation sleeve, and the first gear is screwed onto the external thread at the rear end of the vascular protection sleeve by an internal thread; a transmission device includes a front support body and a rear support body, the rear end of the tissue fixation sleeve is fixed to the front through hole of the front support body, and the rear end of the vascular protection sleeve is fixed to the rear through hole of the rear support body; a rotating shaft and a second gear meshing with the first gear are provided between the front and rear support bodies; and a drive device is connected to the rotating shaft. This invention has a simple structure, a reasonable design, and a low cost; is simple to operate and easy to master; causes minimal trauma to the patient and is highly safe; and shortens the time required for vein harvesting, with an average of 2-3 minutes per vessel, which is only 1 / 10 of the time required by the best current endoscopic harvesting systems, thereby improving surgical efficiency.

[0004] However, when the great saphenous vein collection device is used to collect blood vessels, it is necessary to first pass a guide wire through the blood vessel to be collected, fix the two ends of the guide wire through a fixing device, and then separate and collect the blood vessels through the great saphenous vein collection device. The guide wire cannot be fixed by the great saphenous vein collection device, so more equipment is required during the operation, the surgical operation process is also more complicated, and it is not convenient to use.

[0005] Therefore, it is necessary to provide a double-trocar great saphenous vein harvesting device to solve the above technical problems.

[0006] Summary of the Invention

[0007] The purpose of the present invention is to provide a double-trocar great saphenous vein harvesting device to solve the problems raised in the above background technology.

[0008] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a double-cannula knife great saphenous vein collection device, comprising a handle, a cannula cutter and a protective cannula, wherein the protective cannula is arranged inside the cannula cutter, and the cannula cutter is rotatably connected to the protective cannula, the protective cannula passes through the handle, and a driving mechanism for driving the cannula cutter to move relative to the handle is provided in the handle, a wire threading tube is fixedly installed on the top end of the handle, one end of the protective cannula extends into the interior of the protective cannula, and a first fixing mechanism for fixing the guide wire is provided in the wire threading tube.

[0009] As a further solution of the present invention, the side wall of the wire threading tube is fixedly connected to a first support rod, the end of the first support rod is fixedly connected to a second support rod, the second support rod and the first support rod are arranged perpendicular to each other, and the second support rod and the handle are arranged parallel to each other, the first support rod and the second support rod are both hollow, and the end of the second support rod away from the first support rod is provided with a second fixing mechanism for fixing the guide wire.

[0010] As a further solution of the present invention, a sliding sleeve is slidably installed on the second support rod, and a fixed plate is fixedly connected to the sliding sleeve. A wire threading hole is opened on the fixed plate. When in use, the guide wire passes through the wire threading hole, thereby guiding the guide wire so that the guide wire is located at the axial centerline position of the blood vessel.

[0011] As a further solution of the present invention, the first fixing mechanism includes a fixing sleeve and a first traction rope, the fixing sleeve is arranged in a ring shape, the fixing sleeve is made of elastic rubber material, an annular channel is provided in the fixing sleeve, the first traction rope passes through the annular channel, one end of the first traction rope can be slidably connected to the rope body of the first traction rope after passing through the annular channel, that is, the end of the first traction rope is a closed annular structure with a variable radius, so that after the first traction rope is pulled, the inner diameter of the closed annular structure shrinks, thereby shrinking the inner diameter of the fixing sleeve, and the first support rod is provided with an adjustment mechanism for pulling the first traction rope.

[0012] As a further solution of the present invention, the adjustment mechanism includes an adjusting cylinder, which is fixedly mounted on the first support rod. An adjusting bolt is threadedly mounted on the adjusting cylinder, and the adjusting bolt is coaxially arranged with the adjusting cylinder. The first traction rope passes through the inner cavity of the first support rod, and the bottom end of the adjusting bolt is connected to the end of the first traction rope.

[0013] As a further solution of the present invention, the second fixing mechanism includes a fixing seat, which is fixedly installed on the end of the second support rod away from the first support rod. A through hole is opened on the fixing seat, and a pressure plate is slidably installed in the through hole. The bottom end of the pressure plate is fixedly connected to a tension spring, and the bottom end of the tension spring is fixedly connected to the fixing seat. The top end of the pressure plate is fixedly connected to a second traction rope, and the second traction rope passes through the inner cavity of the second support rod, and the top end of the second traction rope is connected to the bottom end of the adjusting bolt.

[0014] As a further solution of the present invention, the driving mechanism includes a threaded tube and a nut, the threaded tube is sleeved on the outer wall of the casing cutter, the outer wall of the threaded tube is provided with threads, and the threaded tube is arranged inside the handle, the nut is fixedly installed inside the handle, the threaded tube passes through the nut, and the threaded tube is threadedly connected to the nut, a first gear is sleeved on the end of the threaded tube away from the nut, and a driving component for driving the first gear to rotate is provided in the handle.

[0015] As a further solution of the present invention, the drive assembly includes a second gear and a motor. The second gear is rotatably installed inside the handle, the second gear is meshed with the first gear, the length of the second gear is longer than that of the first gear, the motor is fixedly installed in the handle, and the output end of the motor is transmission connected to the second gear.

[0016] As a further solution of the present invention, a limiting column is fixedly installed in the handle, the limiting column and the threaded tube are arranged parallel to each other, a slip ring is slidably installed on the limiting column, and the slip ring is fixedly connected to the outer wall of the protective sleeve through a connecting rod.

[0017] As a further solution of the present invention, a guide groove is provided on the top of the fixing sleeve, and the guide groove is set to be truncated cone-shaped, so that the guide wire is easier to insert into the fixing sleeve, so that the fixing sleeve has a guiding function, thereby making it easier to insert the guide wire into the protective sleeve.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention drives the cannula cutter to move in a direction away from the grip through a driving mechanism, so that the cannula cutter is inserted into the tissue. When cutting the tissue, the blood vessel is always located inside the protective cannula, thereby protecting the blood vessel and preventing the cannula cutter from cutting the blood vessel. The first fixing mechanism can fix one end of the guide wire located in the wire threading tube, so that the guide wire cannot move relative to the protective cannula, so that the guide wire can better position the movement of the cannula cutter, so that the cannula cutter can move more accurately when cutting the tissue, further preventing accidental injury to the blood vessel. The provision of the first fixing mechanism makes it more convenient to fix the guide wire, reduces the difficulty of surgical operation, and facilitates use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a schematic diagram of a three-dimensional structure of the present invention;

[0020] FIG2 is an enlarged structural diagram of point A in FIG1 of the present invention;

[0021] FIG3 is a schematic diagram of the cross-sectional structure of the present invention;

[0022] FIG4 is an enlarged structural diagram of point B in FIG3 of the present invention;

[0023] FIG5 is an enlarged structural diagram of point C in FIG3 of the present invention;

[0024] FIG6 is an enlarged structural diagram of point D in FIG3 of the present invention;

[0025] FIG7 is a schematic cross-sectional view of the casing cutter of the present invention;

[0026] FIG8 is a schematic diagram of the cross-sectional structure of the present invention when used in surgery.

[0027] In the figure: 1. handle; 2. casing cutter; 201. blade; 3. protective casing; 4. wire threading tube; 5. fixing sleeve; 501. annular channel; 6. first traction rope; 7. first support rod; 8. second support rod; 9. sliding sleeve; 10. fixing plate; 1001. wire threading hole; 11. fixing seat; 12. pressure plate; 13. tension spring; 14. second traction rope; 15. adjusting cylinder; 16. adjusting bolt; 17. adjusting knob; 18. threaded tube; 19. nut; 20. first gear; 21. second gear; 22. motor; 23. limit column; 24. slip ring; 25. connecting rod; 26. guide wire. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Please refer to Figures 1 to 5, 7 and 8. In the embodiment of the present invention, a double-cannula knife great saphenous vein collection device includes a handle 1, a cannula cutter 2 and a protective cannula 3. The protective cannula 3 is used to protect the blood vessel. The protective cannula 3 is arranged inside the cannula cutter 2, and the cannula cutter 2 is rotatably connected to the protective cannula 3, that is, the cannula cutter 2 can rotate relative to the protective cannula 3, but the protective cannula 3 cannot slide relative to the cannula cutter 2. The end of the cannula cutter 2 is provided with a blade 201, and the blade 201 is preferably The shape of the protective sleeve 3 is selected to be wavy, and the tissue can be cut by the blade 201. The protective sleeve 3 passes through the handle 1. The handle 1 is provided with a driving mechanism for driving the sleeve cutter 2 to move relative to the handle 1. The top of the handle 1 is fixedly installed with a wire threading cylinder 4. One end of the protective sleeve 3 extends into the interior of the protective sleeve 3. The wire threading cylinder 4 is provided with a first fixing mechanism for fixing the guide wire 26. During the operation, the skin at both ends of the vein to be taken is first incised and the vein is cut off, and the end vein is retained for ligation. The guide wire 26 is then passed through the threading tube 4, and then passed through one end of the protective sleeve 3 and out from the other end. The guide wire 26 is then passed through the vein at one skin incision and then led out from the skin incision at another place. The end of the guide wire 26 located in the threading tube 4 is fixed by the first fixing mechanism, and the cannula cutter 2 is driven by the driving mechanism to move in the direction away from the grip 1, so that the cannula cutter 2 is inserted into the tissue. When the tissue is cut, the blood vessel is always located inside the protective sleeve 3, thereby protecting the blood vessel and preventing the cannula cutter 2 from cutting the blood vessel. The end of the guide wire 26 located in the threading tube 4 is fixed by the first fixing mechanism, so that the guide wire 26 cannot move relative to the protective sleeve 3, so that the guide wire 26 can better position the movement of the cannula cutter 2, so that the cannula cutter 2 can move more accurately when cutting the tissue, further preventing accidental injury to the blood vessel. The setting of the first fixing mechanism makes it more convenient to fix the guide wire 26, reduces the difficulty of surgical operation, and is easy to use.

[0030] In this embodiment, preferably, the side wall of the wire threading tube 4 is fixedly connected to a first support rod 7, and the end of the first support rod 7 is fixedly connected to a second support rod 8. The second support rod 8 and the first support rod 7 are arranged perpendicular to each other, and the second support rod 8 and the handle 1 are arranged parallel to each other. The first support rod 7 and the second support rod 8 are both hollow. The end of the second support rod 8 away from the first support rod 7 is provided with a second fixing mechanism for fixing the guide wire 26; the guide wire 26 is passed through the inside of the vein at one skin incision and then led out from another skin incision, and the other end of the guide wire 26 is fixed by the second fixing mechanism, thereby achieving the fixation of both ends of the guide wire 26. There is no need to use other tools to fix the guide wire 26 separately, and the operation is more convenient.

[0031] In this embodiment, preferably, a sliding sleeve 9 is slidably installed on the second support rod 8, and a fixing plate 10 is fixedly connected to the sliding sleeve 9. A wire threading hole 1001 is provided on the fixing plate 10. When in use, the guide wire 26 passes through the wire threading hole 1001, thereby guiding the guide wire 26 so that the guide wire 26 is located at the axial centerline position of the blood vessel; during surgery, the fixing plate 10 is fixed to the skin incision on the side away from the handle 1 by medical tape, and the guide wire 26 is passed through the wire threading hole 1001, thereby limiting the guide wire 26 so that the guide wire 26 is located at the axial centerline position of the blood vessel, and the fixing plate 10 can slide relative to the second support rod 8, so that when the handle 1 moves, the fixing plate 10 can always be located at the skin incision position, which is convenient for limiting the guide wire 26 and making the position of the guide wire 26 more stable.

[0032] In this embodiment, preferably, the first fixing mechanism includes a fixing sleeve 5 and a first traction rope 6, the fixing sleeve 5 is arranged in a ring shape, the fixing sleeve 5 is made of elastic rubber material, an annular channel 501 is provided in the fixing sleeve 5, the first traction rope 6 passes through the annular channel 501, and one end of the first traction rope 6 can be slidably connected to the rope body of the first traction rope 6 after passing through the annular channel 501, that is, the end of the first traction rope 6 is a closed annular structure with a variable radius, so that after the first traction rope 6 is pulled, the inner diameter of the closed annular structure shrinks, thereby shrinking the inner diameter of the fixing sleeve 5, and the first support rod 7 is provided with an adjustment mechanism for pulling the first traction rope 6.

[0033] In this embodiment, preferably, the adjusting mechanism includes an adjusting cylinder 15, which is fixedly mounted on the first support rod 7, and an adjusting bolt 16 is threadedly mounted on the adjusting cylinder 15. The adjusting bolt 16 is coaxially arranged with the adjusting cylinder 15, and the first traction rope 6 passes through the inner cavity of the first support rod 7, and the bottom end of the adjusting bolt 16 is connected to the end of the first traction rope 6. A connecting ball is rotatably mounted on the bottom end of the adjusting bolt 16, and the connecting ball is rotatably connected to the adjusting bolt 16, thereby preventing the first traction rope 6 from rotating when the adjusting bolt 16 rotates, thereby preventing the first traction rope 6 from being entangled, and an adjusting knob 17 is fixedly mounted on the top end of the adjusting bolt 16; when fixing the guide wire 26, the adjusting bolt 16 is loosened by the adjusting knob 17, so that the adjusting bolt 16 moves upward, and as the adjusting bolt 16 moves, the adjusting bolt 16 pulls the first traction rope 6 to move, so that the annular part of the first traction rope 6 pulls the fixing sleeve 5 to tighten, so that the inner wall of the fixing sleeve 5 is pressed on the guide wire 26, thereby fixing the guide wire 26.

[0034] Please refer to Figure 6. In the embodiment of the present invention, the second fixing mechanism includes a fixing seat 11, which is fixedly mounted on the end of the second support rod 8 away from the first support rod 7. A through hole is opened on the fixing seat 11, and a pressure plate 12 is slidably mounted in the through hole. The bottom end of the pressure plate 12 is fixedly connected to a tension spring 13, and the bottom end of the tension spring 13 is fixedly connected to the fixing seat 11. The top end of the pressure plate 12 is fixedly connected to a second traction rope 14, and the second traction rope 14 passes through the inner cavity of the second support rod 8, and the top end of the second traction rope 14 is connected to the bottom end of the adjusting bolt 16; the guide wire 26 passes through the through hole on the fixing seat 11, and when the adjusting bolt 16 moves upward, the second traction rope 14 is pulled upward, thereby driving the pressing plate 12 to move upward, so that the guide wire 26 is pressed between the pressing plate 12 and the top inner wall of the through hole, thereby fixing the other end of the guide wire 26. By only rotating the adjusting knob 17, both ends of the guide wire 26 can be fixed at the same time, which is more convenient to operate.

[0035] Please refer to Figure 3. In the embodiment of the present invention, the driving mechanism includes a threaded tube 18 and a nut 19. The threaded tube 18 is sleeved on the outer wall of the casing cutter 2. The outer wall of the threaded tube 18 is threaded, and the threaded tube 18 is arranged inside the handle 1. The nut 19 is fixedly installed inside the handle 1. The threaded tube 18 passes through the nut 19, and the threaded tube 18 is threadedly connected to the nut 19. The end of the threaded tube 18 away from the nut 19 is sleeved with a first gear 20, and a driving component for driving the first gear 20 to rotate is provided in the handle 1.

[0036] In this embodiment, preferably, the driving assembly includes a second gear 21 and a motor 22, the second gear 21 is rotatably installed inside the handle 1, the second gear 21 is meshed with the first gear 20, the length of the second gear 21 is longer than the length of the first gear 20, the motor 22 is fixedly installed in the handle 1, and the output end of the motor 22 is transmission-connected with the second gear 21; a button is provided on the handle 1, and a battery is provided in the handle 1, and the battery is electrically connected to the motor 22 through the button, and there are two buttons, one button controls the forward transmission of the output end of the motor 22, and the other button controls the reverse transmission of the output end of the motor 22; when the motor 22 is turned on, the output end of the motor 22 drives the second gear 21 to rotate, and when the second gear 21 rotates, it drives the first gear 20 to rotate, and when the first gear 20 rotates, it drives the threaded tube 18 to rotate, and the threaded tube 18 is threadedly connected to the nut 19, so that the threaded tube 18 can move relative to the handle 1 when it rotates, thereby driving the cannula cutter 2 to rotate while moving relative to the handle 1, so that the cannula cutter 2 can better cut the tissue.

[0037] In this embodiment, preferably, a limiting column 23 is fixedly installed in the handle 1, and the limiting column 23 and the threaded tube 18 are arranged parallel to each other. A slip ring 24 is slidably installed on the limiting column 23, and the slip ring 24 is fixedly connected to the outer wall of the protective sleeve 3 through a connecting rod 25; through the arrangement of the limiting column 23 and the slip ring 24, the protective sleeve 3 can only move relative to the handle 1 and cannot rotate relative to the handle 1, thereby preventing the protective sleeve 3 from rotating when the sleeve cutter 2 rotates, and preventing the rotation of the protective sleeve 3 from damaging the blood vessel.

[0038] In this embodiment, preferably, a guide groove is provided on the top of the fixing sleeve 5, and the guide groove is set to be a truncated cone shape, so that the guide wire 26 is easier to insert into the fixing sleeve 5, so that the fixing sleeve 5 has a guiding function, thereby making it easier to insert the guide wire 26 into the protective sleeve 3.

[0039] Working principle: During the operation, the skin at both ends of the vein to be taken is first cut and the vein is cut off, and the end vein is ligated. Then the guide wire 26 is inserted into the fixing sleeve 5, and then inserted from one end of the protective sleeve 3 and out from the other end. Then the guide wire 26 is passed through the inside of the vein at one skin incision, and then led out from the skin incision at another place, and the end of the guide wire 26 is passed through the through hole on the fixing seat 11, and then the adjusting knob 17 is rotated to move the adjusting bolt 16 upward. As the adjusting bolt 16 moves upward, the adjusting bolt 16 pulls the first traction rope 6 to move, so that the annular part of the first traction rope 6 pulls the fixing sleeve 5 to tighten, so that the inner wall of the fixing sleeve 5 is pressed on the guide wire 26, thereby fixing one end of the guide wire 26, and at the same time, the adjusting bolt 16 moves upward. When the second traction rope 14 is pulled upward, the pressure plate 12 is driven to move upward, so that the guide wire 26 is pressed between the pressure plate 12 and the top inner wall of the through hole, thereby fixing the other end of the guide wire 26; then the motor 22 is turned on, and the output end of the motor 22 drives the second gear 21 to rotate. When the second gear 21 rotates, it drives the first gear 20 to rotate. When the first gear 20 rotates, it drives the threaded tube 18 to rotate. The threaded tube 18 is threadedly connected to the nut 19, so that the threaded tube 18 can move relative to the handle 1 when it rotates, thereby driving the cannula cutter 2 to rotate and move relative to the handle 1 at the same time, so that the cannula cutter 2 can better cut the tissue. When cutting the tissue, the blood vessel is always located inside the protective cannula 3, thereby protecting the blood vessel and preventing the cannula cutter 2 from cutting the blood vessel.

[0040] The above description is a detailed description of the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. Any equivalent changes or modifications completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A double-trocar knife great saphenous vein collection device, comprising a handle (1), a trocar cutter (2) and a protective sleeve (3), wherein the protective sleeve (3) is arranged inside the trocar cutter (2), and the trocar cutter (2) is rotatably connected to the protective sleeve (3), characterized in that: The protective sleeve (3) passes through the handle (1), and a driving mechanism for driving the sleeve cutter (2) to move relative to the handle (1) is provided in the handle (1). A wire threading tube (4) is fixedly installed on the top of the handle (1), and one end of the protective sleeve (3) extends into the interior of the protective sleeve (3). A first fixing mechanism for fixing the guide wire (26) is provided in the wire threading tube (4).

2. The double-trocar great saphenous vein harvesting device according to claim 1, characterized in that: The side wall of the wire threading tube (4) is fixedly connected to a first support rod (7), the end of the first support rod (7) is fixedly connected to a second support rod (8), and the end of the second support rod (8) away from the first support rod (7) is provided with a second fixing mechanism for fixing the guide wire (26).

3. The double-trocar great saphenous vein harvesting device according to claim 2, characterized in that: A sliding sleeve (9) is slidably mounted on the second support rod (8), a fixing plate (10) is fixedly connected to the sliding sleeve (9), and a threading hole (1001) is provided on the fixing plate (10).

4. The double-trocar great saphenous vein harvesting device according to claim 3, characterized in that: The first fixing mechanism comprises a fixing sleeve (5) and a first traction rope (6); the fixing sleeve (5) is arranged in an annular shape; an annular channel (501) is provided in the fixing sleeve (5); the first traction rope (6) passes through the annular channel (501); and the first support rod (7) is provided with an adjustment mechanism for traction of the first traction rope (6).

5. The double-trocar great saphenous vein harvesting device according to claim 4, characterized in that: The adjustment mechanism comprises an adjustment cylinder (15), the adjustment cylinder (15) is fixedly mounted on the first support rod (7), an adjustment bolt (16) is threadedly mounted on the adjustment cylinder (15), the first traction rope (6) passes through the inner cavity of the first support rod (7), and the bottom end of the adjustment bolt (16) is connected to the end of the first traction rope (6).

6. The double-trocar great saphenous vein harvesting device according to claim 5, characterized in that: The second fixing mechanism includes a fixing seat (11), the fixing seat (11) is fixedly mounted on one end of the second support rod (8) away from the first support rod (7), a through hole is opened on the fixing seat (11), a pressure plate (12) is slidably mounted in the through hole, the bottom end of the pressure plate (12) is fixedly connected to a tension spring (13), the bottom end of the tension spring (13) is fixedly connected to the fixing seat (11), the top end of the pressure plate (12) is fixedly connected to a second traction rope (14), the second traction rope (14) passes through the inner cavity of the second support rod (8), and the top end of the second traction rope (14) is connected to the bottom end of the adjusting bolt (16).

7. The double-trocar great saphenous vein harvesting device according to any one of claims 1 to 6, characterized in that: The driving mechanism comprises a threaded tube (18) and a nut (19), wherein the threaded tube (18) is sleeved on the outer wall of the casing cutter (2), the outer wall of the threaded tube (18) is provided with a thread, and the threaded tube (18) is arranged inside the handle (1), and the nut (19) is fixedly installed inside the handle (1), the threaded tube (18) passes through the nut (19), and the threaded tube (18) and the nut (19) are threadedly connected, and a first gear (20) is sleeved on one end of the threaded tube (18) away from the nut (19), and a driving component for driving the first gear (20) to rotate is provided in the handle (1).

8. The double-trocar great saphenous vein harvesting device according to claim 7, characterized in that: The driving assembly comprises a second gear (21) and a motor (22), wherein the second gear (21) is rotatably mounted inside the handle (1), the second gear (21) is meshed with the first gear (20), and the motor (22) is fixedly mounted inside the handle (1), and the output end of the motor (22) is transmission-connected to the second gear (21).

9. The double-trocar great saphenous vein harvesting device according to claim 8, characterized in that: A limiting column (23) is fixedly installed in the handle (1), the limiting column (23) and the threaded tube (18) are arranged parallel to each other, a slip ring (24) is slidably installed on the limiting column (23), and the slip ring (24) is fixedly connected to the outer wall of the protective sleeve (3) through a connecting rod (25).