Arthroscope composite plasma knife

Abstract

The utility model belongs to the technical field of minimally invasive surgery, and relates to an arthroscope composite plasma knife which comprises a handle, a knife body tube shell, a hook-shaped electrode knife head and a horseshoe-shaped electrode knife head. The hook-shaped electrode tool bit and the horseshoe-shaped electrode tool bit are respectively wrapped by insulating materials and installed in the tool body tube shell, the top end of the horseshoe-shaped electrode tool bit extends out of the upper portion of the tool body tube shell, the hook-shaped electrode tool bit is of a telescopic structure, and the top end of the hook-shaped electrode tool bit in the extending state is higher than the top end of the horseshoe-shaped electrode tool bit. And the top end of the hook-shaped electrode tool bit in the retracted state is lower than that of the horseshoe-shaped electrode tool bit. By designing the hook-shaped electrode tool bit and the horseshoe-shaped electrode tool bit, switching between the hook-shaped electrode tool bit and the horseshoe-shaped electrode tool bit can be achieved quickly, surgical tools do not need to be replaced frequently, surgical difficulty is reduced, surgical efficiency is improved, and purchasing and maintaining cost of surgical instruments is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of minimally invasive surgery, and particularly relates to an arthroscopic composite plasma knife. Background Art

[0002] With the change of people's lifestyle and the aggravation of population aging, the incidence of joint diseases (such as osteoarthritis, patellar instability, patellar subluxation, meniscus injury, etc.) has increased significantly. More and more patients need to be treated for these diseases through arthroscopic surgery. Arthroscopic surgery has become one of the preferred methods for treating joint diseases due to its advantages of minimally invasive, fast recovery, and few complications.

[0003] In arthroscopic surgery, it is often necessary to use a variety of instruments to complete different operations within a narrow surgical field of view. For example, a plasma knife is used for cutting and ablation of certain tissues, and a plasma hook knife is used for hooking and separating certain tissues. The use of a variety of different plasma instruments in this surgical process has the following technical problems:

[0004] High complexity: During the surgical process, the doctor needs to frequently replace different plasma instruments, increasing the complexity and time of the surgery;

[0005] High cost: Medical institutions need to purchase and maintain a variety of different special plasma instruments, increasing the equipment cost;

[0006] Inconvenient operation: The doctor needs to continuously adjust and replace different plasma instruments during the surgery, which is inconvenient for the doctor to operate and affects the surgical efficiency.

[0007] The development of modern medical technology has put forward higher requirements for surgical instruments, that is, surgical instruments need to have versatility, high efficiency, convenience, and safety. Traditional single-function plasma instruments can no longer meet the needs of complex surgeries. It is necessary to develop a composite multi-functional (with both cutting and hooking functions), easy-to-operate, and highly safe plasma instrument. Summary of the Invention

[0008] In order to solve the above technical problems, the utility model provides an arthroscopic composite plasma knife. The technical solution adopted by the utility model is as follows:

[0009] The arthroscopic composite plasma knife includes a handle, a knife body shell, a hook-shaped electrode knife head, and a horseshoe-shaped electrode knife head. The knife body shell is fixedly installed at the top of the handle. The knife body shell is made of metal. The hook-shaped electrode knife head and the horseshoe-shaped electrode knife head are respectively installed in the knife body shell by wrapping insulating materials. The top of the horseshoe-shaped electrode knife head extends out from above the knife body shell. The hook-shaped electrode knife head is a telescopic structure. The top of the hook-shaped electrode knife head in the extended state is higher than the top of the horseshoe-shaped electrode knife head, and the top of the hook-shaped electrode knife head in the retracted state is lower than the top of the horseshoe-shaped electrode knife head.

[0010] Preferably, the handle is of a cavity structure and is symmetrically formed by buckling a pair of handle shells with engaging structures. The lower part of the blade tube shell is adhesively bonded to the upper part of the handle by fixing glue.

[0011] Preferably, two parallel support bars are symmetrically and fixedly arranged inside the handle shells, and the adjacent side surfaces of a pair of support bars adjacent after the two handle shells are buckled are in contact. The lower end of the lead screw motor is fixedly installed on the upper surface of one of the lower support bars, and semi-circular grooves I are symmetrically formed in the adjacent side surfaces of the upper pair of support bars. After the handle shells are buckled, the pair of semi-circular grooves I form a circular groove I, and the upper end of the lead screw motor is installed in the circular groove I.

[0012] Preferably, the lead screw motor is a forward and reverse rotation motor. The motor output shaft of the lead screw motor is fixedly connected to a rotating lead screw. A lifting seat is in threaded rotation connection with the outer periphery of the rotating lead screw. The lifting seat is made of an insulating material, and a vertical through hole is formed in the side of the lifting seat. The lower end of the connecting pipe with an external thread passes through the vertical through hole and is fixedly installed on the lifting seat by a pair of nuts located on the upper and lower sides of the lifting seat.

[0013] Preferably, the upper end of the blade tube shell is of a bent structure, and an insulating layer is wrapped around the outer periphery of the vertical structure of the blade tube shell between the bent structure and the upper end of the handle shell.

[0014] Preferably, an insulating tube is sleeved on the inner periphery of the blade tube shell. The upper end of the insulating tube is of a bent structure matching the upper end of the blade tube shell. The insulating tube is made of a tough insulating material. The inside of the insulating tube is a second installation cavity. An auxiliary insulating tube is integrally formed on one side of the second installation cavity. The inside of the auxiliary insulating tube is a first installation cavity. The diameter of the first installation cavity is smaller than the radius of the second installation cavity. The inner diameter of the auxiliary insulating tube is larger than the outer diameter of the connecting pipe. The upper end of the connecting pipe is located in the first installation cavity. The inside of the connecting pipe is a wiring hole. The lower end of the hook-shaped electrode blade head is inserted into the top of the wiring hole. The upper end of the power supply cable passes through the wiring hole and is electrically connected to the lower end of the hook-shaped electrode blade head. The head of the hook-shaped electrode blade head is a sickle-shaped rigid metal conductive material electrode wire, and the lower part of the hook-shaped electrode blade head is a flexible conductive material.

[0015] Preferably, a fixing seat with a cylindrical structure is sleeved on the inner circumference of the bent structure at the upper end of the blade tube shell. The fixing seat is made of an insulating material. The inner circumference of the fixing seat tube wall is provided with suction holes, and the suction holes are stepped holes that are narrow at the top and wide at the bottom. The inner diameter of the bottommost stepped hole matches the outer diameter of the top end of the inner suction tube, and the top end of the inner suction tube is fixedly installed in the bottommost stepped hole; several electrode pins are arranged on the lower surface of the horseshoe-shaped electrode tip, and several vertical second mounting holes matching the electrode pins are arranged on the tube wall of the fixing seat. The lower ends of the electrode pins pass through the second mounting holes and are electrically connected to the upper ends of the power supply cables; a first mounting hole is arranged on the tube wall of the fixing seat corresponding to the position of the insulating tube. The lower end of the hook-shaped electrode tip passes through the first mounting hole and is inserted into the insulating tube. The upper port of the first mounting hole is connected to the upper end of the suction hole in a vertical through structure, and the bottom surface of the through structure is a slope structure that slopes from the first mounting hole to the suction hole from top to bottom; a sealing gasket is arranged at the bottom end of the fixing seat. The sealing gasket is made of heat-resistant rubber material, and sealing gasket through holes corresponding to the first mounting hole, the second mounting hole, and the suction hole are opened on the sealing gasket.

[0016] Preferably, a concave connecting frame is arranged at the middle position of the horseshoe-shaped electrode tip, and convex structures are welded at the positions corresponding to the electrode pins on the lower surface of the horseshoe-shaped electrode tip, and the convex structures correspond to the second mounting holes.

[0017] Preferably, semi-circular grooves II and semi-circular grooves III are symmetrically opened on the adjacent side surfaces of the upper and lower support bars respectively. After the handle housing is buckled, a pair of semi-circular grooves II form a circular groove II, and a pair of semi-circular grooves III form a circular groove III. The inner suction tube is fixedly installed in the circular groove II, and the power supply cable is fixedly installed in the circular groove III.

[0018] Preferably, the blade tube shell, the hook-shaped electrode tip, and the horseshoe-shaped electrode tip are respectively connected to a power supply through a power supply cable.

[0019] Advantages of the present utility model:

[0020] By designing a composite structure plasma knife with a hook-shaped electrode tip and a horseshoe-shaped electrode tip, when precise cutting of the lateral patellar retinaculum is required during arthroscopic minimally invasive surgery, or when soft tissue cutting or tissue ablation is required, the switching between the two tips can be quickly achieved, eliminating the need to frequently replace surgical tools, reducing the surgical difficulty, improving the surgical efficiency, and reducing the procurement and maintenance costs of surgical instruments. Description of the Drawings

[0021] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. They are used together with the embodiments of the present utility model to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0022] Figure 1 Schematic diagram of the overall structure of the arthroscopic composite plasma knife according to an embodiment of the present utility model;

[0023] Figure 2 is Figure 1 Partial enlarged cross-sectional view at location A in

[0024] Figure 3 Partial structural diagram of the head of the knife body shell according to an embodiment of the present utility model;

[0025] Figure 4 is Figure 3 Cross-sectional view in the B-B direction in

[0026] Figure 5 is Figure 4 Cross-sectional view in the C-C direction in

[0027] Figure 6 Partial disassembled diagram of the horseshoe-shaped electrode knife head and the fixing seat according to an embodiment of the present utility model;

[0028] In the figure, 1 is a hook-shaped electrode knife head, 2 is a motor fixing seat 19, 3 is a knife body shell, 4 is an insulating layer, 5 is a forward rotation button for the lead screw, 6 is a handle, 7 is a power supply cable, 8 is an inner suction tube, 9 is an insulating tube, 10 is a handle housing, 11 is a rotating lead screw, 12 is a lifting seat, 13 is a connecting tube, 14 is a wiring hole, 15 is a fixing glue, 16 is a circular groove three, 17 is a support bar, 18 is a horseshoe-shaped electrode knife head, 19 is a fixing seat, 20 is a first mounting hole, 21 is a suction hole, 22 is a sealing gasket, 23 is a first mounting cavity, 24 is an electrode pin, 25 is a second mounting cavity, 26 is a second mounting hole, 27 is a reverse rotation button for the lead screw, 28 is a connecting frame. Specific embodiments

[0029] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0030] As Figures 1-6 shown, an arthroscopic composite plasma knife includes a handle 6 and a hook-shaped electrode knife head 1 and a horseshoe-shaped electrode knife head 18 mounted above the handle 6. The handle 6 is a quasi-elliptical cavity structure and can also be designed into a cavity structure of other shapes according to needs. Upper and lower mounting holes are respectively provided in the upper and lower parts of the handle 6. The upper mounting hole is matched with the cylindrical knife body shell 3, and the lower part of the knife body shell 3 is fixedly bonded to the top of the upper mounting hole of the handle 6 through a fixing glue 15; the lower mounting hole is matched with the inner suction tube 8 and the power supply cable 7. The top ends of the inner suction tube 8 and the power supply cable 7 pass through the lower mounting hole and are connected into the internal cavity structure of the handle 6.

[0031] The handle 6 has a detachable structure and is symmetrically formed by snapping together a pair of handle housings 10 with a snap-fit structure. Inside the handle housings 10, two parallel support bars 17 are fixedly arranged up and down. The two support bars 17 are symmetrically adjacent to each other in a pair of handle housings 10. After the pair of handle housings 10 are snapped together, the adjacent side surfaces of the adjacent pair of support bars 17 are closely attached to each other. The lower end of the microminiature lead screw motor is fixedly installed by screws on the upper surface of the left end of one of the lower support bars 17. On the adjacent side surfaces of the upper pair of support bars 17, semi-circular grooves I are symmetrically opened. After the handle housings 10 are snapped together, the pair of semi-circular grooves I form a circular groove I, and the upper end of the lead screw motor is fixedly installed in the circular groove I. The lower pair of support bars 17 play a role in supporting and fixing the bottom end of the lead screw motor, and the circular groove I plays a role in limiting the upper end of the lead screw motor, ensuring the reliable and stable installation of the lead screw motor. On the adjacent side surfaces of the middle parts of the two support bars 17 up and down, semi-circular grooves II are symmetrically opened. After the handle housings 10 are snapped together, the pair of semi-circular grooves II form a circular groove II, and the inner suction tube 8 is fixedly installed in the circular groove II. The circular groove II plays a role in fixing and limiting the inner suction tube 8. On the adjacent side surfaces of the right ends of the two support bars 17 up and down, semi-circular grooves III are symmetrically opened. After the handle housings 10 are snapped together, the pair of semi-circular grooves III form a circular groove III 16, and the power supply cable 7 is fixedly installed in the circular groove III 16. The circular groove III 16 plays a role in fixing and limiting the power supply cable 7. The snap-fit structure can be correspondingly arranged on one or two pairs of support bars 17.

[0032] The motor output shaft of the lead screw motor is fixedly connected with a rotating lead screw 11, and a lifting seat 12 is rotationally and movably installed by being threadedly connected to the outer circumference of the rotating lead screw 11. The lifting seat 12 is made of insulating material. An internal threaded hole matching the rotating lead screw 11 is formed on one side (the left side in the figure) of the lifting seat 12, and a through hole is formed on the other side (the right side in the figure) of the lifting seat 12. After the lower end portion with an external thread of the connecting pipe 13 penetrates through the through hole, the connecting pipe 13 is fixedly installed on the lifting seat 12 by a pair of nuts located on the upper and lower sides of the lifting seat 12. The upper end portion of the connecting pipe 13 extends into the insulating pipe 9 to limit the circumferential rotation of the lifting seat 12, so that the lifting seat 12 can only move up and down relative to the rotating lead screw 11, thereby driving the connecting pipe 13 to move up and down. A limiting plate is provided at the top end of the rotating lead screw 11 to prevent the lifting seat 12 from disengaging from the upper end of the rotating lead screw 11. The lead screw motor is a forward and reverse rotation motor, and the lead screw motor is provided with a lead screw forward rotation button 5 and a lead screw reverse rotation button 27. One ends of the lead screw forward rotation button 5 (the "+" key in the figure) and the lead screw reverse rotation button 27 (the "-" key in the figure) respectively penetrate through the handle housing 10 and are exposed for easy pressing. The other ends of the lead screw forward rotation button 5 and the lead screw reverse rotation button 27 are respectively electrically connected to the lead screw motor. The lead screw forward rotation button 5 exposed on the handle housing 10 is located above the lead screw reverse rotation button 27. The button design can quickly and conveniently control the forward and reverse rotation of the lead screw motor. The lead screw motor adopts servo control technology to ensure the accurate control of the telescopic stroke of the hook-shaped electrode tip 1. The lead screw motor with forward and reverse rotation functions is an existing product. In the embodiment of the present invention, only the up and down movement of the lifting seat 12 and the connecting pipe 13 is realized through the lead screw motor, and the structure of the lead screw motor is not an innovation point, so it will not be described in detail here. The connecting pipe 13 is made of hard insulating material, and the hard insulating material can ensure the smooth up and down movement of the connecting pipe 13 in the insulating pipe 9 and the insulating performance. The lead screw motor can use an external power supply or an internal battery.

[0033] The tool body tube shell 3 is made of metal material, and the upper end portion of the tool body tube shell 3 is designed as a bent structure with a certain degree of curvature, which can facilitate surgical operations. The tool body tube shell 3 is essentially a loop electrode. The lower end of the tool body tube shell 3 is connected to a power supply through a power line cable 7. The tool body tube shell 3 respectively forms a plasma excitation loop with the hook-shaped electrode tip 1 (working electrode one) and the horseshoe-shaped electrode tip 18 (working electrode two). The tool body tube shell 3 is equivalent to an external electrode, and the hook-shaped electrode tip 1 and the horseshoe-shaped electrode tip 18 are equivalent to internal electrodes. The internal electrodes are used to excite plasma. This is the prior art, and the principle will not be described in detail here. To ensure safety after power-on, the outer circumference of the lower end portion of the tool body tube shell 3 (a section between the bent structure and the upper end of the handle housing 10) is wrapped with an insulating layer 4, and the bent structure at the upper end portion of the tool body tube shell 3 is not wrapped with insulating material.

[0034] An insulating tube 9 is sleeved on the inner peripheral surface of the blade tube shell 3. The upper end portion of the insulating tube 9 is a bent structure that matches the upper end portion of the blade tube shell 3. The outer peripheral surface of the insulating tube 9 is in interference fit with the inner peripheral surface of the blade tube shell 3 and is integrally connected by fitting. In order to make the connection between the blade tube shell 3 and the insulating tube 9 more firm, glue can also be used to bond and fix the insulating tube 9 and the blade tube shell 3 into one body.

[0035] The insulating tube 9 is made of an insulating material with a certain toughness. The inner circumference of the insulating tube 9 is a multi-chamber tube with a special-shaped structure. The inside of the insulating tube 9 is a second installation cavity 25. The inner suction tube 8 and the power cable 7 both pass through the second installation cavity 25. On one side of the second installation cavity 25 (the left side in the figure), an auxiliary insulating tube is integrally formed. The inside of the auxiliary insulating tube is a first installation cavity 23. The diameter of the first installation cavity 23 is smaller than the radius of the second installation cavity 25. The inner diameter of the auxiliary insulating tube is slightly larger than the outer diameter of the connecting tube 13. There is a slight gap between the inner circumference of the auxiliary insulating tube and the outer circumference of the connecting tube 13. The size of the gap should enable the connecting tube 13 to move smoothly up and down in the auxiliary insulating tube. The inside of the connecting tube 13 is a wiring hole 14. The lower end portion of the hook-shaped electrode blade head 1 is inserted into the top end of the wiring hole 14. The upper end portion of the power cable 7 passes through the wiring hole 14 and is electrically connected to the lower end portion of the hook-shaped electrode blade head 1. The lower end portion of the power cable 7 is connected to a power source to energize the hook-shaped electrode blade head 1.

[0036] A fixing seat 19 with a cylindrical structure is sleeved on the inner circumference of the bent structure at the upper end portion of the blade tube shell 3. The fixing seat 19 is made of an insulating material, such as ceramic, polytetrafluoroethylene, etc. The outer diameter of the fixing seat 19 matches the inner diameter of the bent structure at the head of the blade tube shell 3, and the two are connected by interference fit or bonded and fixed with glue. A sealing gasket 22 is provided at the bottom end of the fixing seat 19. The sealing gasket 22 is made of a heat-resistant rubber material.

[0037] The inner circumference of the tube wall of the fixing seat 19 is a suction hole 21. The suction hole 21 is a stepped hole that is narrow at the top and wide at the bottom. The inner diameter of the bottom stepped hole of the suction hole 21 matches the outer diameter of the top end of the inner suction tube 8. The inner circumference of the bottom stepped hole of the suction hole 21 is in contact with the outer circumference of the top end of the inner suction tube 8 and is connected by interference fit or bonded and fixed with glue. The bottom end of the inner suction tube 8 passes through the lower installation hole and extends out from inside the handle 6, and is connected to a container for containing surgical waste liquid.

[0038] The lower surface of the horseshoe-shaped electrode tip 18 is provided with a plurality of electrode pins 24. A plurality of second mounting holes 26 in the vertical direction and mating with the electrode pins 24 are provided on the tube wall of the fixing seat 19. The lower ends of the electrode pins 24 pass through the second mounting holes 26 and are electrically connected to the upper end of the power supply cable 7. The lower end of the power supply cable 7 passes through the handle 6 and is connected to a power source. The horseshoe-shaped electrode tip 18 is powered through the power supply cable 7 and the electrode pins 24. The electrode pins 24 located inside the second mounting holes 26 can also play a role in fixing and limiting the horseshoe-shaped electrode tip 18.

[0039] A first mounting hole 20 corresponding to the position of the insulating tube 9 is provided on the tube wall of the fixing seat 19. The lower end of the hook-shaped electrode tip 1 passes through the first mounting hole 20 and is inserted into the insulating tube 9. The first mounting hole 20 plays a role in guiding and limiting the hook-shaped electrode tip 1. The upper port of the first mounting hole 20 is connected to the upper end of the suction hole 21 in a vertical through structure. The through structure can ensure that the hook-shaped electrode tip 1 moves downward in place, so that the top of the retracted hook-shaped electrode tip 1 is lower than the top of the horseshoe-shaped electrode tip 18. The bottom surface of the through structure is a slope structure, which slopes from the first mounting hole 20 to the suction hole 21 from top to bottom. The slope structure facilitates the inhalation of surgical waste liquid into the suction hole 21.

[0040] The fixing seat 19 is provided with the first mounting hole 20 and the second mounting hole 26, which can reliably insulate the electrode pins 24 of the hook-shaped electrode tip 1 and the horseshoe-shaped electrode tip 18 located therein from the inner wall of the blade body tube shell 3.

[0041] The sealing gasket 22 is provided with sealing gasket through holes corresponding to the first mounting hole 20, the second mounting hole 26 and the suction hole 21. The hook-shaped electrode tip 1, the electrode pins 24 and the inner suction tube 8 all pass through the corresponding sealing gasket through holes. The sealing gasket 22 can prevent surgical waste liquid from flowing into the insulating tube 9. At the same time, the sealing gasket 22 can play a role in limiting the hook-shaped electrode tip 1 and the electrode pins 24.

[0042] The horseshoe-shaped electrode tip 18 is arranged on the upper end surface of the fixing seat 19, and the electrode pins 24 pass through the second mounting holes 26 of the fixing seat 19 to fix the horseshoe-shaped electrode tip 18. The horseshoe-shaped electrode tip 18 is provided with a discontinuous groove corresponding to the position of the first mounting hole 20. The discontinuous groove can make the top of the hook-shaped electrode tip 1 drop to be lower than the top of the horseshoe-shaped electrode tip 18, so as to maximize the ablation area of the horseshoe-shaped electrode tip 18.

[0043] Furthermore, a concave connecting frame 28 can be arranged at the middle position of the horseshoe-shaped electrode tip 18. After the hook-shaped electrode tip 1 drops to the lowest position, the end of the hook-shaped electrode tip 1 is lapped on the connecting frame 28, and the connecting frame 28 plays a role in supporting and limiting the hook-shaped electrode tip 1.

[0044] Furthermore, a convex structure can be welded at the position on the lower surface of the horseshoe-shaped electrode tip 18 corresponding to the electrode pin 24. The convex structure corresponds to the second mounting hole 26, which can make the installation of the horseshoe-shaped electrode tip 18 more stable.

[0045] The head of the hook-shaped electrode tip 1 is a scythe-shaped electrode wire, which can be made of a rigid metal conductive material. In order to ensure the smoothness when the hook-shaped electrode tip 1 passes through the bending structure of the blade body shell 3 and the insulating tube 9, the lower part of the hook-shaped electrode tip 1 corresponding to the bending structure is made of a conductive material with good flexibility (such as nitinol), and the two materials are welded together.

[0046] The arthroscopic composite plasma knife of the embodiment of the present invention mainly has the following technical characteristics:

[0047] 1. The present invention can drive the rotating lead screw 11 to rotate forward or backward through the lead screw motor with forward and reverse functions. When the rotating lead screw 11 rotates forward, the lifting seat 12 and the connecting pipe 13 can move upward, and when the rotating lead screw 11 rotates backward, the lifting seat 12 and the connecting pipe 13 can move downward, so that the hook-shaped electrode tip 1 installed in the connecting pipe 13 can be automatically telescopically transformed to complete different surgical operations.

[0048] 2. The blade body shell 3 is a metal tube, which is wrapped with an insulating layer 4 on the outside and is provided with an insulating tube 9 matching its inner diameter inside to ensure safe use. The insulating tube 9 is a multi-chamber tube, which respectively includes a first mounting chamber 23 and a second mounting chamber 25. The hook-shaped electrode tip 1 and the connecting pipe 13 are fixedly connected in the first mounting chamber 23. The inner diameter of the first mounting chamber 23 matches the connecting pipe 13 to play a guiding role and ensure the stable telescopic movement of the hook-shaped electrode tip 1.

[0049] 3. The hook-shaped electrode tip 1 is located at the disconnected groove of the horseshoe-shaped electrode tip 18. A concave connecting frame 28 is arranged at the center of the horseshoe-shaped electrode tip 18 to provide a lifting space for the hook-shaped electrode tip 1; the electrode pin 24 is led out from below the convex structure of the horseshoe-shaped electrode tip 18. Through the structural design of the mutual cooperation between the hook-shaped electrode tip 1 and the horseshoe-shaped electrode tip 18, the working area of the suction hole 21 is ensured, and the ablation area after the horseshoe-shaped electrode tip 18 is electrified and the smooth lifting of the hook-shaped electrode tip 1 are ensured.

[0050] The operation steps of the arthroscopic composite plasma knife of the embodiment of the present invention are as follows:

[0051] When precise cutting of the lateral patellar retinaculum is required during minimally invasive surgery: Press the forward rotation button 5 of the lead screw on the handle 6. The lead screw motor drives the lead screw to rotate forward, causing the lifting seat 12 and the connecting pipe 13 to rise, synchronously driving the hook-shaped electrode tip 1 on the connecting pipe 13 to rise and extend outward. After the hook-shaped electrode tip 1 reaches the working position, the lead screw motor automatically stops running, and the hook-shaped electrode tip 1 maintains the extended length. Energize the hook-shaped electrode tip 1 to precisely cut the lateral patellar retinaculum.

[0052] When soft tissue cutting or tissue ablation is required during minimally invasive surgery: If the arthroscopic composite plasma knife is in the initial state, that is, the hook-shaped electrode tip 1 is in the hidden position, it can be directly used; if the hook-shaped electrode tip 1 is in the extended position after just cutting the lateral patellar retinaculum, at this time, press the reverse rotation button 27 of the lead screw on the handle 6. The lead screw motor drives the lead screw to rotate in reverse, causing the lifting seat 12 and the connecting pipe 13 to descend, synchronously driving the hook-shaped electrode tip 1 on the connecting pipe 13 to descend and retract. After the hook-shaped electrode tip 1 contracts to the initial position, the lead screw motor stops running. Energize the horseshoe-shaped electrode tip 18 to perform soft tissue cutting or tissue ablation, and the surgical waste liquid generated enters the container for containing the surgical waste liquid through the absorption holes 21.

[0053] In the embodiments of the present utility model, the technical features not described in detail are all prior art or conventional technical means, and will not be elaborated herein.

[0054] Finally, it should be noted that: The above embodiments are only specific implementation manners of the present utility model, used to illustrate the technical solutions of the present utility model, rather than limiting it. The protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that: Any person skilled in the art within the technical scope disclosed by the present utility model can modify the technical solutions recorded in the foregoing embodiments or can easily think of changes, or perform equivalent replacements for some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model, and should all be covered within the protection scope of the present utility model.

Claims

1. Arthroscopic composite plasma knife, characterized in that, It includes a handle, a blade tube shell, a hook-shaped electrode tip and a horseshoe-shaped electrode tip. The blade tube shell is fixedly installed at the top end of the handle. The blade tube shell is made of metal. The hook-shaped electrode tip and the horseshoe-shaped electrode tip are respectively installed in the blade tube shell by wrapping insulating materials. The top end of the horseshoe-shaped electrode tip extends out from above the blade tube shell. The hook-shaped electrode tip is a telescopic structure. The top end of the hook-shaped electrode tip in the extended state is higher than the top end of the horseshoe-shaped electrode tip, and the top end of the hook-shaped electrode tip in the retracted state is lower than the top end of the horseshoe-shaped electrode tip.

2. The arthroscopic composite plasma knife according to claim 1, wherein The handle is a cavity structure. The handle is symmetrically formed by buckling a pair of handle shells with engaging structures. The lower part of the blade tube shell is adhesively bonded to the upper part of the handle by fixing glue.

3. The arthroscopic composite plasma knife according to claim 2, wherein, Two parallel support bars are symmetrically and fixedly arranged inside the handle shell, one above the other. When the pair of handle shells are buckled, the adjacent side surfaces of the pair of adjacent support bars are in contact. The lower end of the lead screw motor is fixedly installed on the upper surface of one of the lower support bars. Semi-circular grooves I are symmetrically opened on the adjacent side surfaces of the pair of upper support bars. When the handle shells are buckled, the pair of semi-circular grooves I form a circular groove I, and the upper end of the lead screw motor is installed in the circular groove I.

4. The arthroscopic composite plasma knife according to claim 3, wherein The lead screw motor is a forward and reverse motor. The motor output shaft of the lead screw motor is fixedly connected to a rotating lead screw. The outer circumference of the rotating lead screw is threadedly connected to a lifting seat. The lifting seat is made of insulating material. A vertical through hole is opened on the side of the lifting seat. The lower end portion of the connecting pipe with an external thread passes through the vertical through hole and is fixedly installed on the lifting seat by a pair of nuts located on the upper and lower sides of the lifting seat.

5. The arthroscopic composite plasma knife according to claim 4, wherein, The upper end portion of the blade tube shell is a curved structure. An insulating layer is wrapped around the outer circumference of the vertical structure of the blade tube shell between the curved structure and the upper end of the handle shell.

6. The arthroscopic composite plasma knife according to claim 5, wherein An insulating tube is sleeved inside the blade tube shell. The upper end portion of the insulating tube is a curved structure that matches the upper end portion of the blade tube shell. The insulating tube is made of a ductile insulating material. The inside of the insulating tube is a second installation cavity. An auxiliary insulating tube is integrally formed on one side of the second installation cavity. The inside of the auxiliary insulating tube is a first installation cavity. The diameter of the first installation cavity is smaller than the radius of the second installation cavity. The inner diameter of the auxiliary insulating tube is larger than the outer diameter of the connecting pipe. The upper end of the connecting pipe is located in the first installation cavity. The inside of the connecting pipe is a wiring hole. The lower end portion of the hook-shaped electrode tip is inserted into the top end of the wiring hole. The upper end portion of the power supply cable passes through the wiring hole and is electrically connected to the lower end portion of the hook-shaped electrode tip. The head of the hook-shaped electrode tip is a sickle-shaped rigid metal conductive material electrode wire, and the lower part of the hook-shaped electrode tip is a flexible conductive material.

7. The arthroscopic composite plasma knife according to claim 6, wherein, A fixing seat of a cylindrical structure is sleeved on the inner circumference of the bent structure at the upper end of the blade tube shell. The fixing seat is made of an insulating material. The inner circumference of the fixing seat tube wall is provided with suction holes, and the suction holes are stepped holes that are narrow at the top and wide at the bottom. The inner diameter of the bottommost stepped hole matches the outer diameter of the top end of the inner suction tube, and the top end of the inner suction tube is fixedly installed in the bottommost stepped hole; several electrode pins are arranged on the lower surface of the horseshoe-shaped electrode head. Several vertical second mounting holes that match the electrode pins are arranged on the tube wall of the fixing seat. The lower ends of the electrode pins pass through the second mounting holes and are electrically connected to the upper ends of the power supply cables; a first mounting hole is arranged on the tube wall of the fixing seat corresponding to the position of the insulating tube. The lower end of the hook-shaped electrode head passes through the first mounting hole and is inserted into the insulating tube. The connection between the upper port of the first mounting hole and the upper end of the suction hole is a through structure in the vertical direction, and the bottom surface of the through structure is a slope structure that slopes from the first mounting hole to the suction hole from top to bottom; a sealing gasket is arranged at the bottom end of the fixing seat. The sealing gasket is made of a heat-resistant rubber material, and through holes corresponding to the first mounting hole, the second mounting hole, and the suction hole are opened on the sealing gasket.

8. The arthroscopic composite plasma knife according to claim 7, characterized in that, A concave connecting frame is arranged at the middle position of the horseshoe-shaped electrode head. A convex structure is welded at the position corresponding to the electrode pins on the lower surface of the horseshoe-shaped electrode head, and the convex structure corresponds to the second mounting hole.

9. The arthroscopic composite plasma knife according to claim 3, wherein, Semicircular grooves two and three are symmetrically opened on the adjacent side surfaces of the upper and lower support bars respectively. After the handle housing is buckled, a pair of semicircular grooves two form a circular groove two, and a pair of semicircular grooves three form a circular groove three. The inner suction tube is fixedly installed in the circular groove two, and the power supply cable is fixedly installed in the circular groove three.

10. The arthroscopic composite plasma knife according to any one of claims 1-9, characterized in that, The blade tube shell, the hook-shaped electrode head, and the horseshoe-shaped electrode head are respectively connected to a power supply through a power supply cable.

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