Developable cruciate ligament repairing device

Abstract

The utility model relates to a developable cruciate ligament repair device, and relates to the technical field of medical instruments, and the developable cruciate ligament repair device comprises a nail sheath provided with an external thread; the nail body is slidably arranged in the nail sheath in a penetrating manner; the clamping mechanism is arranged in the nail body and used for clamping the cruciate ligament; the clamping mechanism comprises a clamping plate; the two-way screw rod is rotationally connected to the screw body, and two thread parts with threads in different screwing directions are in threaded connection with the clamping plates respectively; the clamping mechanism further comprises a first bevel gear and a second bevel gear, wherein the first bevel gear is connected to the two-way screw; the transmission shaft is rotationally connected to the nail body; the second bevel gear is fixedly connected to the transmission shaft and meshed with the first bevel gear; the knob is fixedly connected to the end, away from the clamping plate, of the transmission shaft and flush with the end face of the nail body. The application has the effect of relieving the adverse effect on the patient after the cruciate ligament is repaired.

Description

Technical Field

[0001] This application relates to the technical field of medical appliances, and particularly to a developable cruciate ligament repair device. Background Art

[0002] The cruciate ligament is composed of two ligaments within the human knee joint, connecting the tibia and the femur. Its function is to stabilize the knee joint and prevent the anterior and posterior sliding of the knee joint. When a person engages in strenuous exercise, resulting in excessive anterior and posterior loads on the knee joint, it is possible to cause a cruciate ligament tear, causing the person to lose the motor ability of the knee. The common treatment method is cruciate ligament repair.

[0003] When the cruciate ligament tear is relatively minor, it can be treated by suturing the torn ligament; when the cruciate ligament tear is severe and cannot be treated by suturing, the commonly used repair method is to drill holes in the femur and tibia, pass an artificial ligament or the patient's hamstring tendon through the two holes, thread the two ends, and fix them on the surface of the bone through a button-loop titanium plate to replace the original cruciate ligament.

[0004] Regarding the above related technologies, the inventor found that the button-loop titanium plate is fixed on the outer wall of the bone, and the button-loop titanium plate protruding from the bone surface may cause irritation to other surrounding soft tissues or cause discomfort in the patient's knee, having an adverse impact on the patient. Utility Model Content

[0005] In order to reduce the adverse effects on patients after cruciate ligament repair, this application provides a developable cruciate ligament repair device.

[0006] The developable cruciate ligament repair device provided by this application adopts the following technical solutions:

[0007] A nail sheath, provided with an external thread;

[0008] A nail body, slidably passing through the nail sheath;

[0009] A clamping mechanism, arranged inside the nail body for clamping the cruciate ligament.

[0010] By adopting the above technical solutions, the nail sheath can be fixed in the bone hole through its own external thread. One end of the nail body facing the femur-tibia gap clamps the new ligament through the clamping mechanism. By pulling the nail body away from the new ligament, the new ligament can be set in the original ligament position. There is no need to thread the ligament and the whole will not protrude from the bone surface, which can reduce the adverse effects on patients after cruciate ligament repair and reduce the discomfort caused to the patient's knee.

[0011] Optionally, the clamping mechanism includes:

[0012] A splint;

[0013] The bidirectional screw is rotatably connected to the nail body, and two threaded portions with different thread directions are respectively threadedly connected to a splint.

[0014] By adopting the above technical solution, when the bidirectional screw is rotated, the two splints will move in the directions of approaching or separating from each other, realizing the clamping of the new ligament, and the fixation of the ligament end can be completed without threading a rope through the ligament.

[0015] Optionally, the clamping mechanism further includes:

[0016] The first bevel gear is connected to the bidirectional screw;

[0017] The transmission shaft is rotatably connected to the nail body;

[0018] The second bevel gear is fixedly connected to the transmission shaft and meshes with the first bevel gear;

[0019] The knob is fixedly connected to the end of the transmission shaft away from the splint and is flush with the end face of the nail body.

[0020] By adopting the above technical solution, when the knob is rotated, the rotational torque will be transmitted to the second bevel gear through the transmission shaft. The second bevel gear rotates to drive the bidirectional screw to rotate and the splint to move, realizing the control of the splint by the knob. At the same time, due to the existence of the transmission shaft, the knob can be arranged at the end of the nail body away from the splint, facilitating the doctor's control of the knob during the operation.

[0021] Optionally, a first locking hole is provided on the side wall of the knob; a plurality of second locking holes are evenly distributed on the nail body along the central axis of the knob, and the first locking hole and the second locking hole form a complete pin hole.

[0022] By adopting the above technical solution, through the cooperation of the first locking hole and different second locking holes, the position state of the knob relative to the nail body can be fixed with a pin, and further the clamping force of the splint on the ligament can be adjusted.

[0023] Optionally, a telescopic protective cover is provided between the splints.

[0024] By adopting the above technical solution, the protective cover can prevent the ligament tissue from contacting the bidirectional screw and the first bevel gear, so that the ligament does not affect the normal operation of the clamping mechanism.

[0025] Optionally, anti-slip convex strips are provided on the splints.

[0026] By adopting the above technical solution, when the splint clamps the ligament, the anti-slip convex strips will be embedded in the ligament, increasing the friction between the splint and the ligament, making the splint clamp the ligament more firmly and reliably.

[0027] Optionally, a sliding groove is axially provided on the inner side wall of the nail sheath, and a stop block is provided in the sliding groove; an elastic clamping plate is provided on the circumferential outer side wall of the nail body and is slidably inserted into the sliding groove.

[0028] By adopting the above technical solution, since the new ligament needs to be pre-tensioned before fixation, after the clamping mechanism on the nail body clamps the new ligament and slides away from the new ligament, the elastic clamping plate will be blocked by the stop block after passing through the stop block, and the tensioning state of the ligament by the repair device can be achieved.

[0029] Optionally, a pulling part is provided on the nail body.

[0030] By adopting the above technical solution, the pulling part can facilitate the surgeon to pull the nail body.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. The nail sheath can be fixed in the bone hole through its own external thread. One end of the nail body facing the femur and tibia gap clamps the new ligament through the clamping mechanism. Pulling the nail body away from the new ligament can set the new ligament in the original ligament position, without the need to thread the ligament and the whole will not protrude from the bone surface, which can reduce the adverse effects on the patient after cruciate ligament repair and reduce the discomfort caused to the patient's knee.

[0033] 2. Through the cooperation of the first locking hole and different second locking holes, the position state of the fixing knob relative to the nail body can be realized by using a pin, and then the clamping force of the splint on the ligament can be adjusted.

[0034] 3. The protective cover can prevent the ligament tissue from contacting the bidirectional screw and the first bevel gear, so that the ligament does not affect the normal operation of the clamping mechanism.

[0035] 4. When the clamping mechanism on the nail body clamps the new ligament and slides away from the new ligament, the elastic clamping plate will be blocked by the stop block after passing through the stop block, and the tensioning state of the ligament by the repair device can be achieved. [[ID=2-five]]BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 is an exploded schematic view of the present application;

[0037] Figure 2 is a cross-sectional schematic view of the present application;

[0038] Figure 3 is a schematic view of one end structure of the present application;

[0039] In the figure, 1. Nail sheath; 11. Chute; 12. Stop block; 2. Nail body; 21. Second locking hole; 22. Elastic clamping plate; 23. Pulling part; 3. Clamping mechanism; 31. Splint; 311. Anti-slip convex strip; 32. Bidirectional screw; 33. First bevel gear; 34. Transmission shaft; 35. Second bevel gear; 36. Knob; 361. First locking hole; 37. Protective cover. Detailed implementation mode

[0040] The following will further elaborate on this application in conjunction with the attached Figure 1 - attached Figure 3 drawings to provide a more detailed description of this application.

[0041] This application proposes a developable cruciate ligament repair device. Referring to Figure 1 and Figure 2 , it includes a nail sheath 1, a nail body 2, and a clamping structure. The nail sheath 1 is coaxially provided with a through hole, and its outer wall is provided with an external thread, which is threadedly connected in the bone hole; the nail body 2 slides through the nail sheath 1, and there is a clamping structure between the nail body 2 and the nail sheath 1; the clamping mechanism 3 is arranged in the nail body 2 and is used for clamping the new ligament. The repair device of this application is made of developable material.

[0042] The nail sheath 1 is a cylindrical barrel with openings at both ends. One end opening has a rounded corner, the other end is provided with a convex ring, and the middle part is provided with an external thread. The nail sheath 1 can be screwed into the bone hole for fixation through the thread. After the nail sheath 1 is installed in the bone hole, the convex ring end does not protrude from the bone surface, which can reduce the adverse effects on the patient after cruciate ligament repair and reduce the discomfort caused to the patient's knee. The convex ring end of the nail sheath 1 is also provided with a cross slot for screwing the nail sheath 1, which is used for the surgeon to use tools to screw the nail sheath 1.

[0043] The nail body 2 is a cylinder and slides through the nail sheath 1. One end of the nail body 2 near the rounded corner end of the nail sheath 1 is provided with a rectangular notch for accommodating the end of the ligament. An elastic clamping plate 22 with a trapezoidal longitudinal section is integrally formed on the circumferential outer wall of the nail body 2, and the elastic clamping plate 22 inclines towards the notch end of the nail body 2. A chute 11 is axially provided on the inner wall of the nail sheath 1, and a stop block 12 is arranged in the chute 11. The elastic clamping plate 22 can slide in the chute 11. When the elastic clamping plate 22 slides from the side of the stop block 12 near the rounded corner end of the nail sheath 1 to the side of the stop block 12 near the convex ring end of the nail sheath 1, the elastic clamping plate 22 will be squeezed and deformed, and after passing through the side of the stop block 12 near the central axis of the nail sheath 1, it will bounce up. The end face of the elastic clamping plate 22 facing the stop block 12 is parallel, which can prevent the elastic clamping plate 22 from returning to the side of the stop block 12 near the rounded corner end of the nail sheath 1. Because the new ligament needs to be pre-tensioned before fixation, when the clamping mechanism 3 on the nail body 2 clamps the new ligament and slides in the direction away from the new ligament, the elastic clamping plate 22 will be blocked by the stop block 12 after passing through the stop block 12, and the repair device can achieve the tensioned state of the ligament.

[0044]

[0044] The clamping mechanism 3 includes clamping plates 31, a bidirectional screw 32, a first bevel gear 33, a transmission shaft 34, a second bevel gear 35, a knob 36, and a protective cover 37. Rectangular receiving grooves are provided on the side walls of both sides of the notch of the nail body 2. There are two clamping plates 31, which are respectively slidably arranged in the receiving grooves and are adapted to the shape of the receiving grooves. A plurality of anti-slip ridges 311 are integrally formed on the clamping plates 31, and the anti-slip ridges 311 are arranged perpendicular to the central axis of the nail body 2. When the clamping plates 31 clamp the ligament, the anti-slip ridges 311 will be embedded in the ligament, increasing the friction between the clamping plates 31 and the ligament, making the clamping of the ligament by the clamping plates 31 more firm and reliable.

[0045] The bidirectional screw 32 is rotatably connected to the nail body 2, and is provided with threaded portions with opposite thread directions at both ends and is respectively threadedly connected to the clamping plates 31. When the bidirectional screw 32 rotates, the two clamping plates 31 can translate in the directions of approaching or separating from each other, so as to clamp a new ligament. A first bevel gear 33 is coaxially connected to the middle of the bidirectional screw 32. The transmission shaft 34 is rotatably connected in the nail body 2, and its central axis is parallel to the central axis of the nail body 2. A second bevel gear 35 is connected to one end of the transmission shaft 34 close to the clamping plate 31, and the second bevel gear 35 meshes with the first bevel gear 33.

[0046] A U-shaped protective cover 37 is connected between the two clamping plates 31. The protective cover 37 is telescopic and is composed of an outer cover and an inner cover, which can prevent the ligament tissue from contacting the bidirectional screw 32 and the first bevel gear 33, so that the ligament does not affect the normal operation of the clamping mechanism 3.

[0047] Refer to Figure 2 and Figure 3 As shown in [relevant figures], a cylindrical knob 36 is coaxially and fixedly connected to the end of the transmission shaft 34 far from the clamping plate 31, and the knob 36 does not protrude from the end face of the nail body 2. A hexagonal rotating slot is provided on the knob 36, which can facilitate the surgeon to use a hexagon wrench to rotate the knob 36. The knob 36 drives the transmission shaft 34 and the second bevel gear 35 to rotate, and further makes the first bevel gear 33 and the bidirectional screw 32 rotate, so as to realize the movement control of the two clamping plates 31. A first locking hole 361 is provided on the outer side wall of the knob 36 along the radial direction, and the first locking hole 361 is semicircular. On the inner side wall of the groove of the nail body 2 that houses the knob 36, a plurality of second locking holes 21 are provided along the circumferential direction. The second locking holes 21 and the first locking hole 361 can form a complete pin hole. After the clamping plates 31 clamp the new ligament firmly, align the first locking hole 361 with the nearest second locking hole 21 and insert a pin to fix the position of the knob 36 relative to the nail body 2.

[0048] One end of the nail body 2 close to the knob 36 is provided with a hemispherical groove, and a pulling part 23 is integrally formed in the groove. The pulling part 23 has a rectangular cross-section and there is a gap between it and the groove, which is convenient for the surgeon to pull the nail body 2 through the pulling part 23.

[0049] The embodiments of the specific implementation manners are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A developable anterior cruciate ligament repair device, characterized in that, Comprising: A nail sheath (1) provided with an external thread; A nail body (2) slidably inserted into the nail sheath (1); A clamping mechanism (3) arranged inside the nail body (2) for clamping the cruciate ligament.

2. The developable anterior cruciate ligament repair device according to claim 1, wherein The clamping mechanism (3) includes: A clamping plate (31); A bidirectional screw (32) rotatably connected to the nail body (2), and two threaded portions with different thread directions are respectively threadedly connected to a clamping plate (31).

3. The developable cruciate ligament repair device according to claim 2, characterized in that, The clamping mechanism (3) further includes: A first bevel gear (33) connected to the bidirectional screw (32); A transmission shaft (34) rotatably connected to the nail body (2); A second bevel gear (35) fixedly connected to the transmission shaft (34) and meshing with the first bevel gear (33); A knob (36) fixedly connected to one end of the transmission shaft (34) away from the clamping plate (31) and flush with the end face of the nail body (2).

4. The developable cruciate ligament repair device according to claim 3, characterized in that, A first locking hole (361) is provided on the side wall of the knob (36); a plurality of second locking holes (21) are evenly distributed on the nail body (2) along the central axis of the knob (36), and the first locking hole (361) and the second locking hole (21) form a complete pin hole.

5. The developable cruciate ligament repair device according to claim 3, characterized in that, A telescopic protective cover (37) is provided between the clamping plates (31).

6. The developable cruciate ligament repair device according to claim 2, characterized in that, Anti-slip ridges (311) are provided on the clamping plate (31).

7. The developable cruciate ligament repair device according to claim 1, wherein A chute (11) is axially provided on the inner side wall of the nail sheath (1), and a stop block (12) is provided in the chute (11); an elastic clamping plate (22) slidably inserted into the chute (11) is provided on the circumferential outer side wall of the nail body (2).

8. The developable cruciate ligament repair device according to claim 1, characterized in that, A pulling portion (23) is provided on the nail body (2).

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