Meniscus cutter for use under arthroscope

Abstract

Disclosed is a meniscus cutter for use under an arthroscope, comprising a cutter head, a cutter body and a cutter handle that are connected in sequence. A cutting edge is arranged on the cutter head. The cutter further comprises a cutter seat, a movable joint, and a traction mechanism. The cutter head is fixed to the cutter seat. The movable joint is arranged between the cutter seat and the cutter body and comprises a plurality of hinge members. Every two adjacent hinge members are rotationally connected by means of intermediate parts, and a space for swinging is provided between the upper portions and lower portions of the two hinge members. The front end surface of the foremost hinge member is attached to the rear end face of the cutter seat. The traction mechanism comprises a traction wire and a traction linkage switch. The traction wire is axially arranged. The front end of the traction wire sequentially passes through the lower portions of the hinge members and is connected to the foremost hinge member, and the rear end of the traction wire is connected to the traction linkage switch slidably arranged on the cutter handle. By means of the arrangement of the movable joint and the traction mechanism, the cutter head can be driven to swing downwards to an angle required by cutting.

Description

Meniscus cutting knife used under arthroscopy Technical Field

[0001] The invention belongs to meniscus surgical instruments, and in particular relates to a meniscus cutting knife used under arthroscopy. Background Art

[0002] Meniscus injury is one of the most common conditions in sports medicine. Severe meniscus injury can lead to knee pain and articular cartilage wear. The anterior horn of the meniscus lies close to the anterior edge of the tibial plateau, making it difficult to cut and shape the anterior horn without damaging it with conventional endoscopic cutting tools. This is particularly challenging in discoid menisci. Therefore, a tool that can be used arthroscopically to quickly and easily cut the anterior horn and body of the meniscus is needed.

[0003] Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a meniscus cutting knife for use under arthroscopy, which can change the cutting angle of the knife head and is conducive to inserting into the joint to quickly cut the anterior horn and body of the meniscus.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A meniscus cutting knife used under arthroscopy includes a knife head, a blade body and a handle connected in sequence, and the knife head is provided with a cutting edge. It is characterized in that it also includes a knife seat, a movable joint and a traction mechanism. The knife head is fixed on the knife seat, and the movable joint is provided between the knife seat and the knife body, including several hinge parts. The adjacent two hinge parts are rotatably connected through the middle part. There is space for swinging between the upper and lower parts of the two hinge parts. The front end face of the frontmost hinge part is in contact with the rear end face of the knife seat. The traction mechanism includes a traction wire and a traction linkage switch. The traction wire is arranged axially, and the front end passes through the lower part of the hinge part in sequence and is connected to the frontmost hinge part, and the rear end is connected to the traction linkage switch slidably provided on the knife handle.

[0007] The blade body includes a rotating core shaft, and the knife handle includes a fixed handle and a rotating handle arranged behind the fixed handle. The rear end of the rotating core shaft passes through the fixed handle and is arranged in the rotating handle, and can rotate circumferentially with the rotating handle. The front end of the rotating core shaft passes through the hinge part in turn and is connected to the knife seat.

[0008] The front end surface of the rotating handle and the rear end surface of the fixed handle are provided with corresponding magnetically attracted annular protrusions and grooves, which are plugged into each other to form a structure in which the rotating handle and the fixed handle are connected and rotatable.

[0009] A stopper is provided at the rear end of the rotating core shaft, and a hole is provided on the rotating handle for the stopper to be inserted into and fit into. The stopper can slide back and forth in the hole and rotate with the rotating handle. A spring is also sleeved on the rotating core shaft, and the rear end of the spring is against the stopper, and the front end is restricted by the rear end of the fixed handle.

[0010] The blade body also includes a core shaft sleeve, which is sleeved on the rotating core shaft and the traction wire, with a rear end connected to the fixed handle and a front end connected and fixed to the rear end surface of the rearmost hinge part.

[0011] The traction linkage switch is slidably arranged on the fixed handle.

[0012] The cutter head is triangular in shape, and the cutting edges are arranged on both sides thereof.

[0013] The core shaft sleeve is also covered with a protective sleeve which can cover or expose the cutter head by sliding.

[0014] The meniscus cutting knife used under arthroscopy of the present invention has the following advantages:

[0015] 1. Through the setting of movable joints and traction mechanism, the cutter head can be driven downward to the required cutting angle;

[0016] 2. The cutter head can be driven to rotate 360 ​​degrees by rotating the handle and the rotating mandrel;

[0017] 3. By setting a spring, the rotating core shaft can be extended forward accordingly when the cutter head swings down, so that the rotation of the cutter head after the swing is not affected, and the cutter head is maintained in a neutral reset after the movable joint is reset;

[0018] 4. Through the movable protective cover, before the cutting knife is inserted into the human body, it can be moved forward to cover the head for protection. When cutting is required, it can be moved backward to expose the cutter head and movable joint, making it easy to adjust the angle for cutting;

[0019] 5. The cutting knife can be used to quickly and smoothly cut the anterior horn and body of the meniscus without damaging the front edge of the anterior horn of the meniscus. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0021] FIG1 is a schematic structural diagram of the cutter head of the meniscus cutting knife of the present invention;

[0022] FIG2 is a schematic structural diagram of the meniscus cutting knife of the present invention with the blade exposed;

[0023] FIG3 is a schematic structural diagram of a movable joint of the present invention;

[0024] FIG4 is a schematic diagram of the installation structure of the mandrel sleeve of the present invention;

[0025] FIG5 is a schematic diagram of the installation structure of the rotating mandrel and the traction mechanism of the present invention;

[0026] FIG6 is a schematic diagram of the installation structure of the rotating mandrel and the spring of the present invention;

[0027] FIG7 is a schematic structural diagram of the rotating core shaft of the present invention passing through the movable joint;

[0028] FIG8 is a schematic diagram of a state where the cutter head of the present invention rotates downward;

[0029] Figures 9 and 10 are assembly views of the fixed handle and the rotating handle from different perspectives;

[0030] FIG11 and FIG12 are schematic diagrams showing states of the meniscus cutting knife of the present invention when cutting different positions of the meniscus. DETAILED DESCRIPTION

[0031] A meniscus cutting knife for use under arthroscopy of the present invention is shown in Figures 1 to 12, which mainly includes a cutting head 1, a blade body 2 and a handle 3 connected in sequence. The cutting head 1 is provided with a cutting edge, wherein the cutting head 1 is triangular shark tooth-shaped, and the cutting edges 11 are provided on both sides thereof. The cutting knife also includes a knife seat 8, a movable joint 4 and a traction mechanism 5. The knife head 1 is fixed on the front end surface of the knife seat 8 with a convex arc surface. The movable joint 4 is arranged between the knife seat 8 and the blade 2, and specifically includes several hinge parts 41. The two adjacent hinge parts 41 are connected by corresponding pins 42 on the two side surfaces in the middle. There is space for swinging between the upper and lower parts of the two hinge parts 41. The front end surface of the frontmost hinge part 41a is a plane, which is in contact with the rear end surface of the knife seat 8 with a corresponding plane. The traction mechanism 5 includes a traction wire 51 and a traction linkage switch 52. The traction wire 51 can be made of stainless steel wire and is arranged axially. The front end passes through the lower part of the hinge part 41 in sequence and is connected to the frontmost hinge part 41, and the rear end is connected to the traction linkage switch 52 slidably arranged on the knife handle 3. When the linkage switch 52 is slid backward, the lower part of the front hinge member 41a is pulled by the traction wire 51 to rotate downward. Since its front end surface is in contact with the knife seat, the knife seat 8 and the knife head 1 at the front end can be driven to rotate downward. When the traction is continued, the lower part of the front hinge member 41a touches the lower part of the rear hinge member 41 to swing together with it, so as to continuously expand the swing angle. The rotation angle of each hinge member 41 can be controlled by the space designed above. For example, as shown in Figures 3 and 8, the middle hinge members 41 and the rear hinge member 41b can be designed to be wide in the middle and narrow in the upper and lower parts and symmetrical in the upper and lower parts, and the front hinge member 41a Only the rear end surface has a shape corresponding to that of the adjacent middle hinge member 41, creating a 30° opening between the upper and lower portions of the two adjacent hinge members 41. If each hinge member 41 rotates downward 30°, the first three movable hinge members 41 can achieve a maximum downward rotation of 90°, while the rearmost hinge member 41b remains stationary. Of course, the number of hinge members 41 and the opening angle can be adjusted based on actual needs.

[0032] As shown in Figures 1 and 5 to 10, the blade 2 includes a rotating core shaft 21 with elasticity and torsion resistance, and the handle 3 includes a fixed handle 31 and a rotating handle 32 arranged behind the fixed handle 31. The fixed handle 31 is provided with a groove for easy gripping, and the rotating handle 32 is provided with a ridge to increase friction. The rotating core shaft 21 is set at the axial position, and its rear end passes through the fixed handle 31 and is arranged in the rotating handle 32, and can rotate circumferentially with the rotating handle 32. All hinge parts 41 also adopt an internal hollow structure, and the front end of the rotating core shaft 21 passes through the center of the hinge part 41 in turn and is connected to the knife seat 8.

[0033] The relative rotation between the rotating handle 32 and the fixed handle 31 can adopt but is not limited to the following structure: the front end surface of the rotating handle 32 and the rear end surface of the fixed handle 31 are provided with corresponding magnetically attracted annular protrusions 34 and grooves 35, for example, as shown in Figures 9-10, the annular protrusion 34 is a magnet, and the annular groove 35 is provided with metal or magnets that are attracted to the annular protrusion 34. The protrusion 34 and the groove 35 are plugged into each other to form a structure in which the rotating handle 32 and the fixed handle 31 are connected and can rotate.

[0034] A stopper 24 is provided at the rear end of the rotating mandrel 21. The rotating handle 32 is provided with a hole 25 into which the stopper 24 is inserted and correspondingly engages. The stopper 24 can slide back and forth within the hole 25 and rotate with the rotating handle 32. A spring 22 is also sleeved on the rotating mandrel 21. The rear end of the spring 22 abuts against the stopper 24, while the front end is constrained by the rear end of the fixed handle 31. The stopper 24 can be a square block as shown in FIG9 , or can be a prism or a cylindrical body with toothed surfaces.

[0035] In this way, when the rotary handle 32 rotates, the rotating core shaft 21 can drive the blade seat 8 and the blade head 1 to rotate 360°, and when the blade head 1 is in a downward rotation position, the rotating core shaft 21 can extend forward accordingly with the downward swing of the blade seat 8, so that the downward swing and circumferential rotation functions of the blade head 1 are not restricted to each other, and the rotation of the blade head 1 can be realized after the blade head 1 swings down. At the same time, the spring 22 is compressed by the stop block 24, and after the traction wire 51 and the movable joint 4 are reset, the blade head 1 can be maintained in a neutral reset due to the restoring force of the spring 22.

[0036] As shown in Figure 4, the blade 2 also includes a hard core shaft sleeve 23, which is sleeved on the rotating core shaft 21 and the traction wire 51 to protect the rotating core shaft 21 and the traction wire 51, and the rear part of the core shaft sleeve 23 is also provided with a slide groove for the traction linkage switch 52 to move back and forth. The rear end of the core shaft sleeve 23 is connected to the fixed handle 31, and specifically can be fixed to the inside of the fixed handle 31 and pass through the rear end of the fixed handle 31 to resist the front end of the spring 22, playing the role of cooperating with the stop block 24 to compress the spring 22. The front end of the core shaft sleeve 23 is connected and fixed to the rear end face of the rearmost hinge part 41b by a concave-convex fit, playing the role of positioning with the hinge part 41b.

[0037] As shown in FIG1 , the traction linkage switch 52 is slidably disposed on the bottom of the fixed handle 31 . A corresponding sliding groove 33 may be provided on the outer surface of the bottom of the fixed handle 31 for the traction linkage switch 52 to slide axially.

[0038] As shown in Figures 1 and 2, the mandrel sleeve 23 is also covered with a soft silicone protective cover 6 that can be moved to cover or expose the blade head 1. The end of the silicone soft protective cover 6 has a thickened section 61 for easy sliding operation. Before the cutting knife is inserted into the human body, the protective cover 6 is moved forward to cover the cover head to provide protection. When inserting the knife into the joint for cutting, the protective cover 6 is moved backward to expose the blade head 1 and the movable joint 4, making it easier to adjust the angle accordingly for rapid cutting of the meniscus 7, as shown in Figures 9 and 10.

[0039] In summary, by using the meniscus cutting knife of the present invention, under arthroscopy, by controlling the blade 1 to rotate downward and 360° circumferentially, as shown in Figures 11 and 12, the anterior horn and body of the meniscus 7 can be quickly and smoothly cut and shaped without damaging the anterior horn and leading edge of the meniscus 7. This is something that could not be achieved by using ordinary basket forceps in the past.

[0040] However, those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present invention and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A meniscus cutting knife for use under arthroscopy, comprising a knife head, a knife body and a knife handle connected in sequence, wherein the knife head is provided with a cutting edge, and wherein: It also includes a knife holder, a movable joint and a traction mechanism. The knife head is fixed on the knife holder, and the movable joint is arranged between the knife holder and the knife body. It includes several hinge parts. The adjacent hinge parts are rotatably connected through the middle part. There is space for swinging between the upper and lower parts of the two hinge parts. The front end face of the frontmost hinge part fits with the rear end face of the knife holder. The traction mechanism includes a traction wire and a traction linkage switch. The traction wire is arranged axially, and the front end passes through the lower part of the hinge part in turn and is connected to the frontmost hinge part, and the rear end is connected to the traction linkage switch slidably arranged on the knife handle.

2. The meniscus cutter for arthroscopic use according to claim 1, characterized in that: The blade body includes a rotating core shaft, and the knife handle includes a fixed handle and a rotating handle arranged behind the fixed handle. The rear end of the rotating core shaft passes through the fixed handle and is arranged in the rotating handle, and can rotate circumferentially with the rotating handle. The front end of the rotating core shaft passes through the hinge part in turn and is connected to the knife seat.

3. The meniscus cutter for arthroscopic use according to claim 2, characterized in that: The front end surface of the rotating handle and the rear end surface of the fixed handle are provided with corresponding magnetically attracted annular protrusions and grooves, which are plugged into each other to form a structure in which the rotating handle and the fixed handle are connected and rotatable.

4. The meniscus cutter for arthroscopic use according to claim 2 or 3, characterized in that: A stopper is provided at the rear end of the rotating core shaft, and a hole is provided on the rotating handle for the stopper to be inserted into and fit into. The stopper can slide back and forth in the hole and rotate with the rotating handle. A spring is also sleeved on the rotating core shaft, and the rear end of the spring is against the stopper, and the front end is restricted by the rear end of the fixed handle.

5. The meniscus cutter for arthroscopic use according to claim 2, characterized in that: The blade body also includes a core shaft sleeve, which is sleeved on the rotating core shaft and the traction wire, with a rear end connected to the fixed handle and a front end connected and fixed to the rear end surface of the rearmost hinge part.

6. The meniscus cutter for arthroscopic use according to claim 2, characterized in that: The traction linkage switch is slidably arranged on the fixed handle.

7. The meniscus cutter for arthroscopic use according to claim 1, characterized in that: The cutter head is triangular in shape, and the cutting edges are arranged on both sides thereof.

8. The meniscus cutter for arthroscopic use according to claim 1, characterized in that: The core shaft sleeve is also covered with a protective sleeve which can cover or expose the cutter head by sliding.

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