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 pro

Description

[0002] In bypass surgery, it is necessary to collect a bridge vessel (target vessel) from the patient's body, typically the great saphenous vein or the radial artery. In conventional surgery, the skin and muscle tissue must be completely stripped, and the target vessel is separated from the collateral vessels under direct vision. The surgery generally requires making an incision in the patient's leg or arm that corresponds to the length of the target vessel, usually 20-25 cm. The patient experiences significant intraoperative trauma, long postoperative recovery time, high chance of infection, intense and prolonged pain, and noticeable scarring after recovery. Nowadays, the minimally invasive endoscopic vessel harvesting system can assist a doctor in performing minimally invasive surgery on the leg or arm. The doctor only needs to make 1 to 2 small incisions of 1-2 cm on the patient's leg or forearm to easily extract the target vessel. This method causes very little intraoperative trauma to the patient, reduces the possibility of infection and complications, decreases pain, shortens postoperative recovery time, and is more aesthetically pleasing.

[0003] Chinese Patent No. CN106943175A has disclosed a minimally invasive great saphenous vein collection device, where a vascular protective trocar penetrates into a trocar cutting knife, and the trocar cutting knife penetrates into a tissue fixation trocar. A first gear at the tail end of the trocar cutting knife is located outside the tail end of the tissue fixation trocar, and the inner thread of the first gear engages with the external thread at the tail end of the vascular protective trocar. A transmission device includes a front support body and a rear support body, with the tail end of the tissue fixation trocar fixed at a front through-hole of the front support body and the tail end of the vascular protective trocar fixed at a rear through-hole of the rear support body. A rotating shaft and a second gear meshing with the first gear are arranged between the front support body and the rear support body, and a drive device is connected to the rotating shaft. The present invention has a simple structure, reasonable design, and low cost; it is easy to operate and master, causes minimal trauma to the patient, has high safety, and the time required for vein collection is short. The average time for collecting each vessel is 2 3 minutes, which is only 1 / 10 of the time required by the best current endoscopic collection system, thus improving surgical efficiency.

[0004] However, when this great saphenous vein collection device is used to collect the vessel, it is necessary to first pass a guide wire through the vessel, fix both ends of the guide wire using a fixing device, and then separate and collect the vessel using the great saphenous vein collection device. It is unable to fix the guide wire through the great saphenous vein collection device, resulting in the need for additional equipment during surgery, a relatively complex surgical procedure, and inconvenience in use.

[0005] Therefore, it is necessary to provide a great saphenous vein collection device using a double-trocar knife to resolve the foregoing technical problems. SUMMARY

[0006] An objective of the present invention is to provide a great saphenous vein collection device using a double-trocar knife to resolve the problems raised in the background.

[0007] To achieve the foregoing objective, the present invention provides the following technical solution: A great saphenous vein collection device using a double-trocar knife is provided, including a grip, a trocar cutting knife, and a protective trocar, where the protective trocar is disposed in the trocar cutting knife, and the trocar cutting knife is rotatably connected to the protective trocar, where the protective trocar penetrates the grip, a driving mechanism is disposed in the grip and configured to drive the trocar cutting knife to move relative to the grip, a threading cylinder is fixedly mounted at a top end of the grip, an end of the protective trocar extends into the protective trocar, and a first fixing mechanism is disposed in the threading cylinder and configured to fix a guide wire.

[0008] According to a further solution of the present invention, a first support rod is fixedly connected to a side wall of the threading cylinder, and a second support rod is fixedly connected to an end of the first support rod. The second support rod is perpendicular to the first support rod, and the second support rod is parallel to the grip. Both the first support rod and the second support rod are hollow. A second fixing mechanism is disposed at an end of the second support rod away from the first support rod and configured to fix the guide wire.

[0009] According to a further solution of the present invention, a sliding sleeve is slidably mounted on the second support rod, a fixing plate is fixedly connected to the sliding sleeve, and the fixing plate is provided with a threading hole. During use, the guide wire passes through the threading hole, thereby guiding the guide wire and positioning the wide wire at the axial centerline of the vessel.

[0010] According to a further solution of the present invention, the first fixing mechanism includes a fixing sleeve and a first traction rope. The fixing sleeve is annular and the fixing sleeve is made of an elastic rubber material. An annular channel is formed in the fixing sleeve, and the first traction rope passes through the annular channel. One end of the first traction rope, after passing through the annular channel, is slidably connected to the body of the first traction rope, meaning the end of the first traction rope forms a closed annular structure with a variable radius. After the first traction rope is pulled, the inner diameter of this closed annular structure shrinks, thereby causing the inner diameter of the fixing sleeve to shrink. A regulating mechanism is disposed on the first support rod and configured to pull the first traction rope.

[0011] According to a further solution of the present invention, the regulating mechanism includes an adjusting cylinder, the adjusting cylinder is fixedly mounted on the first support rod, an adjusting bolt is threadedly mounted on the adjusting cylinder, the adjusting bolt is coaxially arranged with the adjusting cylinder, the first traction rope passes through an inner cavity of the first support rod, and a bottom end of the adjusting bolt is connected to an end of the first traction rope.

[0012] According to a further solution of the present invention, the second fixing mechanism includes a fixing seat, the fixing seat is fixedly mounted at the end of the second support rod away from the first support rod, the fixing seat is provided with a through hole, a pressing plate is slidably mounted in the through hole, a tension spring is fixedly connected to a bottom end of the pressing plate, a bottom end of the tension spring is fixedly connected to the fixing seat, a second traction rope is fixedly connected to a top end of the pressing plate, the second traction rope passes through an inner cavity of the second support rod, and a top end of the second traction rope is connected to the bottom end of the adjusting bolt.

[0013] According to a further solution of the present invention, the driving mechanism includes a threaded pipe and a nut, the threaded pipe sleeves an outer wall of the trocar cutting knife, an outer wall of the threaded pipe is provided with a thread, the threaded pipe is disposed in the grip, the nut is fixedly mounted in the grip, the threaded pipe penetrates the nut, the threaded pipe is threadedly connected to the nut, a first gear sleeves an end of the threaded pipe away from the nut, and a driving assembly is disposed in the grip and configured to drive the first gear to rotate.

[0014] According to a further solution of the present invention, the drive assembly includes a second gear and a motor, the second gear is rotatably mounted inside the grip, the second gear meshes with the first gear, the second gear is longer than the first gear, the motor is fixedly mounted inside the grip, and an output end of the motor is drivingly connected to the second gear. According to a further solution of the present invention, a limiting post is fixedly mounted in the grip, and the limiting post is parallel to the threaded pipe.

[0015] A sliding ring is slidably mounted on the limiting post, and the sliding ring is fixedly connected to an outer wall of the protective trocar via a connecting rod.

[0016] According to a further solution of the present invention, the top of the fixing sleeve is provided with a guiding groove, where the guiding groove is configured in a truncated cone shape, making it easier for the guide wire to be inserted into the fixing sleeve. This enables the fixing sleeve to have a guiding function, thereby allowing for easier insertion of the guide wire into the protective trocar.

[0017] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the driving mechanism drives the trocar cutting knife to move away from the grip, causing the trocar cutting knife to be inserted into the tissue. When the tissue is cut, the vessel remains inside the protective trocar, thereby protecting the vessel and preventing the trocar cutting knife from cutting it. The first fixing mechanism fixes one end of the guide wire located in the threading cylinder, which prevents the guide wire from moving relative to the protective trocar. This allows the guide wire to better position the movement of the trocar cutting knife, enabling the trocar cutting knife to move more precisely during tissue cutting, thus further preventing accidental damage to the vessel. The arrangement of the first fixing mechanism makes fixing the guide wire more convenient, reducing the difficulty of surgical operations and facilitating use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 is a schematic structural three-dimensional diagram according to the present invention.

[0019] FIG. 2 is a schematic structural enlarged view of part A in FIG. 1 according to the present invention.

[0020] FIG. 3 is a schematic structural cross-sectional view according to the present invention.

[0021] FIG. 4 is a schematic structural enlarged view of part B in FIG. 3 according to the present invention.

[0022] FIG. 5 is a schematic structural enlarged view of part C in FIG. 3 according to the present invention.

[0023] FIG. 6 is a schematic structural enlarged view of part D in FIG. 3 according to the present invention.

[0024] FIG. 7 is a schematic structural cross-sectional view of a trocar cutting knife according to the present invention.

[0025] FIG. 8 is a schematic structural cross-sectional view of the present invention during surgical use.

[0026] In the figures: 1. grip; 2. trocar cutting knife; 201. blade; 3. protective trocar; 4. threading cylinder; 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. threading hole; 11. fixing seat; 12. pressing plate; 13. tension spring; 14. second traction rope; 15. adjusting cylinder; 16. adjusting bolt; 17. adjusting knob; 18. threaded pipe; 19. nut; 20. first gear; 21. second gear; 22. motor; 23. limiting post; 24. sliding ring; 25. connecting rod; and 26. guide wire. DESCRIPTION OF THE EMBODIMENTS

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings of the embodiments of the present invention. It is evident that the described embodiments are merely some 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 those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0028] Referring to FIGs. 1 to 5, 7, and 8, according to an embodiment of this application, a great saphenous vein collection device using a double-trocar knife is provided, including a grip 1, a trocar cutting knife 2, and a protective trocar 3, where the protective trocar 3 is used to protect the vessel. The protective trocar 3 is disposed inside the trocar cutting knife 2, and the trocar cutting knife 2 is rotatably connected to the protective trocar 3, meaning the trocar cutting knife 2 can rotate relative to the protective trocar 3, but the protective trocar 3 cannot slide relative to the trocar cutting knife 2. A blade 201 is provided at an end of the trocar cutting knife 2, where the blade 201 is preferably wavy and the blade 201 is capable of cutting tissue. The protective trocar 3 penetrates the grip 1, and a driving mechanism is disposed in the grip 1 and configured to drive the trocar cutting knife 2 to move relative to the grip 1. A threading cylinder 4 is fixedly mounted at a top end of the grip 1, and one end of the protective trocar 3 extends into the protective trocar 3. A first fixing mechanism is disposed in the threading cylinder 4 and configured to fix a guide wire 26. During surgery, the skin is first incised at both ends of the vein to be collected, the vein is severed, and the ends are ligated. Then, the guiding guide wire 26 is inserted into the threading cylinder 4, passes through one end of the protective trocar 3, and exits from the other end. The guide wire 26 then passes through the vein from one skin incision to be drawn out from the other skin incision. Subsequently, the first fixing mechanism fixes the end of the guide wire 26 located in the threading cylinder 4. The driving mechanism then drives the trocar cutting knife 2 to move away from the grip 1, inserting the trocar cutting knife 2 into the tissue. During tissue cutting, the vessel remains inside the protective trocar 3, thereby protecting the vessel and preventing the trocar cutting knife 2 from cutting it. The first fixing mechanism fixes the end of the guide wire 26 in the threading cylinder 4, which prevents the guide wire 26 from moving relative to the protective trocar 3, allowing the guide wire 26 to better position the movement of the trocar cutting knife 2. This enables the trocar cutting knife 2 to move more precisely during tissue cutting, further preventing accidental damage to the vessel. The arrangement of the first fixing mechanism makes fixing the guide wire 26 more convenient, reducing the difficulty of surgical operations and facilitating use.

[0029] In this embodiment, preferably, a first support rod 7 is fixedly connected to a side wall of the threading cylinder 4, and an end of the first support rod 7 is fixedly connected to a second support rod 8. The second support rod 8 is perpendicular to the first support rod 7, and the second support rod 8 is parallel to the grip 1. Both the first support rod 7 and the second support rod 8 are hollow. A second fixing mechanism is disposed at an end of the second support rod 8 away from the first support rod 7 and configured to fix the guide wire 26. After the guide wire 26 passes through the vein from one skin incision to be drawn out from the other skin incision, the second fixing mechanism fixes the other end of the guide wire 26, thereby securing both ends of the guide wire 26 without requiring additional tools to fix the guide wire 26 separately, making the operation more convenient.

[0030] In this embodiment, preferably, a sliding sleeve 9 is slidably mounted on the second support rod 8, and a fixing plate 10 is fixedly connected to the sliding sleeve 9. The fixing plate 10 is provided with a threading hole 1001. During use, the guide wire 26 passes through the threading hole 1001, thereby guiding the guide wire 26 and positioning the guide wire 26 at the axial centerline of the vessel. During surgery, the fixing plate 10 is secured to the skin incision on the side away from the grip 1 using medical tape, and the guide wire 26 passes through the threading hole 1001, thereby limiting the guide wire 26 and positioning the guide wire 26 at the axial centerline of the vessel. The fixing plate 10 can slide relative to the second support rod 8, so that when the grip 1 moves, the fixing plate 10 remains at the skin incision position, facilitating the limitation of the guide wire 26 and ensuring the position of the guide wire 26 remains relatively stable.

[0031] In this embodiment, preferably, the first fixing mechanism includes a fixing sleeve 5 and a first traction rope 6. The fixing sleeve 5 is annular and the fixing sleeve 5 is made of an elastic rubber material. An annular channel 501 is formed in the fixing sleeve 5, and the first traction rope 6 passes through the annular channel 501. One end of the first traction rope 6, after passing through the annular channel 501, is slidably connected to the body of the first traction rope 6, meaning the end of the first traction rope 6 forms a closed annular structure with a variable radius. After the first traction rope 6 is pulled, the inner diameter of this closed annular structure shrinks, thereby causing the inner diameter of the fixing sleeve 5 to shrink. A regulating mechanism is disposed on the first support rod 7 and configured to pull the first traction rope 6.

[0032] In this embodiment, preferably, the regulating mechanism includes an adjusting cylinder 15, where the adjusting cylinder 15 is fixedly mounted on the first support rod 7. An adjusting bolt 16 is threadedly mounted on the adjusting cylinder 15, and the adjusting bolt 16 is coaxially arranged with the adjusting cylinder 15. The first traction rope 6 passes through an inner cavity of the first support rod 7, and a bottom end of the adjusting bolt 16 is connected to an end of the first traction rope 6. A connecting ball is rotatably mounted at the bottom end of the adjusting bolt 16, where the connecting ball is rotatably connected to the adjusting bolt 16, thereby preventing the adjusting bolt 16 during rotation from driving the first traction rope 6 to rotate and avoiding entanglement of the first traction rope 6. An adjusting knob 17 is fixedly mounted at a top end of the adjusting bolt 16. When the guide wire 26 is fixed, the adjusting knob 17 is turned to loosen the adjusting bolt 16, causing the adjusting bolt 16 to move upward. As the adjusting bolt 16 moves, the adjusting bolt 16 pulls the first traction rope 6 to move, causing the annular portion of the first traction rope 6 to tighten the fixing sleeve 5, so that the inner wall of the fixing sleeve 5 presses against the guide wire 26, thereby fixing the guide wire 26.

[0033] Referring to FIG. 6, in an embodiment of the present invention, the second fixing mechanism includes a fixing seat 11, where the fixing seat 11 is fixedly mounted at an end of the second support rod 8 away from the first support rod 7. The fixing seat 11 is provided with a through hole, and a pressing plate 12 is slidably mounted in the through hole. A tension spring 13 is fixedly connected to a bottom end of the pressing plate 12, and a bottom end of the tension spring 13 is fixedly connected to the fixing seat 11. A second traction rope 14 is fixedly connected to a top end of the pressing plate 12, and the second traction rope 14 passes through an inner cavity of the second support rod 8, with a top end of the second traction rope 14 connected to the bottom end of the adjusting bolt 16. The guide wire 26 passes through the through hole in the fixing seat 11. When the adjusting bolt 16 moves upward, it pulls the second traction rope 14 to move upward, driving the pressing plate 12 to move upward, and causing the guide wire 26 to be pressed between the pressing plate 12 and a top inner wall of the through hole, thus fixing the other end of the guide wire 26. By means of simply rotating the adjusting knob 17, both ends of the guide wire 26 can be fixed simultaneously, making the operation relatively convenient.

[0034] Referring to FIG. 3, in an embodiment of the present invention, the drive mechanism includes a threaded pipe 18 and a nut 19, the threaded pipe 18 sleeves an outer wall of the trocar cutting knife 2, the outer wall of the threaded pipe 18 is provided with a thread, the threaded pipe 18 is disposed in the grip 1, the nut 19 is fixedly mounted in the grip 1, the threaded pipe 18 penetrates the nut 19, the threaded pipe 18 is threadedly connected to the nut 19, a first gear 20 sleeves an end of the threaded pipe 18 away from the nut 19, and a drive assembly is disposed in the grip 1 and configured to drive the first gear 20 to rotate.

[0035] In this embodiment, preferably, the drive assembly includes a second gear 21 and a motor 22, the second gear 21 is rotatably mounted in the grip 1, the second gear 21 meshes with the first gear 20, the second gear 21 is longer than the first gear 20, the motor 22 is fixedly mounted in the grip 1, and an output end of the motor 22 is drivingly connected to the second gear 21. A button is provided on the grip 1, and a battery is arranged in the grip 1. The battery is electrically connected to the motor 22 via the button. There are two buttons: one button controls the forward rotation of the output end of the motor 22, and the other button controls the reverse rotation of the output end of the motor 22. When the motor 22 is activated, 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. When the first gear 20 rotates, it drives the threaded pipe 18 to rotate. Since the threaded pipe 18 is threadedly connected to the nut 19, the rotation of the threaded pipe 18 allows for movement relative to the grip 1, thereby driving the trocar cutting knife 2 to rotate and move relative to the grip 1, enabling the trocar cutting knife 2 to cut tissues more effectively.

[0036] In this embodiment, preferably, a limiting post 23 is fixedly mounted in the grip 1, and the limiting post 23 and the threaded pipe 18 are arranged in parallel. A sliding ring 24 is slidably mounted on the limiting post 23, and the sliding ring 24 is fixedly connected to the outer wall of the protective trocar 3 via a connecting rod 25. The arrangement of the limiting post 23 and the sliding ring 24 ensures that the protective trocar 3 can only move relative to the grip 1 and cannot rotate relative to the grip 1, thereby preventing the protective trocar 3 from being driven to rotate when the trocar cutting knife 2 rotates, and avoiding the rotation of the protective trocar 3 from damaging the vessel.

[0037] In this embodiment, preferably, the top of the fixing sleeve 5 is provided with a guiding groove, where the guiding groove is configured in a truncated cone shape, making it easier for the guide wire 26 to be inserted into the fixing sleeve 5. This enables the fixing sleeve 5 to have a guiding function, thereby allowing for easier insertion of the guide wire 26 into the protective trocar 3.

[0038] Working principle: During surgery, the skin is first incised at both ends of the vein to be collected, the vein is severed, and the ends are ligated. Then, the guiding guide wire 26 is inserted into the fixing sleeve 5, passes through one end of the protective trocar 3, and exits from the other end. The guide wire 26 then passes through the vein from one skin incision to be drawn out from another skin incision, with this end of the guide wire 26 passing through the through hole in the fixing seat 11. Next, 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, causing the annular portion of the first traction rope 6 to tighten the fixing sleeve 5, so that the inner wall of the fixing sleeve 5 presses against the guide wire 26, thereby fixing one end of the guide wire 26. Simultaneously, the upward movement of the adjusting bolt 16 pulls the second traction rope 14 upward, driving the pressing plate 12 to move upward, and causing the guide wire 26 to be 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. Then, the motor 22 is activated, and the output end of the motor 22 drives the second gear 21 to rotate. The rotation of the second gear 21 drives the first gear 20 to rotate, and the rotation of the first gear 20 drives the threaded pipe 18 to rotate. Since the threaded pipe 18 is threadedly connected to the nut 19, the threaded pipe 18 during rotation can move relative to the grip 1, thereby driving the trocar cutting knife 2 to rotate while moving relative to the grip 1, enabling the trocar cutting knife 2 to better cut tissue. During tissue cutting, the vessel remains inside the protective trocar 3, thereby protecting the vessel and preventing the trocar cutting knife 2 from cutting it.

[0039] The above description is a detailed explanation of the preferred feasible 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 into the patent scope of the present invention.

Claims

1. A great saphenous vein collection device using a double-trocar knife, comprising a grip (1), a trocar cutting knife (2), and a protective trocar (3), wherein the protective trocar (3) is disposed in the trocar cutting knife (2), and the trocar cutting knife (2) is rotatably connected to the protective trocar (3), wherein the protective trocar (3) penetrates the grip (1), a driving mechanism is disposed in the grip (1) and configured to drive the trocar cutting knife (2) to move relative to the grip (1), a threading cylinder (4) is fixedly mounted at a top end of the grip (1), an end of the protective trocar (3) extends into the protective trocar (3), and a first fixing mechanism is disposed in the threading cylinder (4) and configured to fix a guide wire (26).

2. The great saphenous vein collection device using a double-trocar knife according to claim 1, wherein a first support rod (7) is fixedly connected to a side wall of the threading cylinder (4), a second support rod (8) is fixedly connected to an end of the first support rod (7), and a second fixing mechanism is disposed at an end of the second support rod (8) away from the first support rod (7) and configured to fix the guide wire (26).

3. The great saphenous vein collection device using a double-trocar knife according to claim 2, wherein 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 the fixing plate (10) is provided with a threading hole (1001).

4. The great saphenous vein collection device using a double-trocar knife according to claim 3, wherein the first fixing mechanism comprises a fixing sleeve (5) and a first traction rope (6), the fixing sleeve (5) is annular, an annular channel (501) is formed in the fixing sleeve (5), the first traction rope (6) passes through the annular channel (501), and a regulating mechanism is disposed on the first support rod (7) and configured to pull the first traction rope (6).

5. The great saphenous vein collection device using a double-trocar knife according to claim 4, wherein the regulating mechanism comprises an adjusting cylinder (15), the adjusting cylinder (15) is fixedly mounted on the first support rod (7), an adjusting bolt (16) is threadedly mounted on the adjusting cylinder (15), the first traction rope (6) passes through an inner cavity of the first support rod (7), and a bottom end of the adjusting bolt (16) isconnected to an end of the first traction rope (6).

6. The great saphenous vein collection device using a double-trocar knife according to claim 5, wherein the second fixing mechanism comprises a fixing seat (11), the fixing seat (11) is fixedly mounted at the end of the second support rod (8) away from the first support rod (7), the fixing seat (11) is provided with a through hole, a pressing plate (12) is slidably mounted in the through hole, a tension spring (13) is fixedly connected to a bottom end of the pressing plate (12), a bottom end of the tension spring (13) is fixedly connected to the fixing seat (11), a second traction rope (14) is fixedly connected to a top end of the pressing plate (12), the second traction rope (14) passes through an inner cavity of the second support rod (8), and a top end of the second traction rope (14) is connected to the bottom end of the adjusting bolt (16).

7. The great saphenous vein collection device using a double-trocar knife according to any one of claims 1 to 6, wherein the driving mechanism comprises a threaded pipe (18) and a nut (19), the threaded pipe (18) sleeves an outer wall of the trocar cutting knife (2), an outer wall of the threaded pipe (18) is provided with a thread, the threaded pipe (18) is disposed in the grip (1), the nut (19) is fixedly mounted in the grip (1), the threaded pipe (18) penetrates the nut (19), the threaded pipe (18) is threadedly connected to the nut (19), a first gear (20) sleeves an end of the threaded pipe (18) away from the nut (19), and a driving assembly is disposed in the grip (1) and configured to drive the first gear (20) to rotate.

8. The great saphenous vein collection device using a double-trocar knife according to claim 7, wherein the drive assembly comprises a second gear (21) and a motor (22), the second gear (21) is rotatably mounted in the grip (1), the second gear (21) meshes with the first gear (20), the motor (22) is fixedly mounted in the grip (1), and an output end of the motor (22) is drivingly connected to the second gear (21).

9. The great saphenous vein collection device using a double-trocar knife according to claim 8, wherein a limiting post (23) is fixedly mounted in the grip (1), the limiting post (23) is parallel to the threaded pipe (18), a sliding ring (24) is slidably mounted on the limiting post (23), and the sliding ring (24) is fixedly connected to an outer wall of the protective trocar (3) via a connecting rod (25).

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