Bone joint repair implant

Abstract

The invention relates to the field of orthopedic medical instruments, in particular to a bone joint repair implant. The implant comprises an articular surface and a fixing handle, the fixing handle is composed of a supporting plate, an inserting rod and a fixing cylinder, and the inserting rod is inserted into the fixing cylinder. A through groove is formed in the side wall of the fixing cylinder, a jacking piece is arranged in the through groove and connected with the fixing cylinder, and a jacking head extending into the fixing cylinder is arranged on the jacking piece. The inserting rod is inserted into the fixing cylinder and abuts against the ejector head, so that the ejector piece expands towards the outer portion of the fixing cylinder and is tightly attached to the bone. Through the unique design of the top piece, the fixing effect and stability of the implant are remarkably improved, the implant is effectively prevented from falling off and shifting, the service life of the implant is prolonged, and the treatment effect of a patient is improved.

Description

Technical Field

[0001] The present application relates to the field of orthopedic medical devices, and in particular to a bone and joint repair implant. Background Art

[0002] Currently, bone and joint repair implants are widely used to treat cartilage defects caused by lesions or injuries. These implants are usually composed of a joint surface and a fixed stem, and are designed to replace damaged cartilage tissue and restore joint function. However, existing implants are prone to dislocation or displacement during long-term use, especially during human activities, affecting the implant effect and the patient's quality of life.

[0003] The patent with publication number US20230338153A1 specifically discloses a joint surface resurfacing implant, which specifically includes an implant, a support plate of the implant, and a fixed part of the implant. The implant is made of high molecular weight polyethylene material and coated with a biocompatible material. The implant is fixed to the support plate. The fixed part of the implant is composed of a lower rod made of titanium alloy and a barb provided on the lower rod. The lower rod is fixedly connected to the support rod, and the lower rod is connected to the bone through the barb to achieve stable fixation of the implant.

[0004] However, in the above technical solution, fixation is achieved by relying only on a set of barbs. On the one hand, the firmness needs to be further improved. On the other hand, after long-term use, the friction between the barbs and the bones increases, which can easily cause bone damage and loosening of the barbs. The above problems need to be further optimized. Summary of the invention

[0005] The present application provides a bone joint repair implant that can be firmly connected to the bone and is not easily aggravated by wear after long-term use, and has a long service life. The following technical solutions are adopted: A bone joint repair implant comprises a joint surface and a fixing stem; The fixed handle includes a support plate, an insertion rod and a fixed tube; the support plate is fixedly connected to the end of the insertion rod, and the insertion rod is inserted into the fixed tube; A through groove is provided on the side wall of the fixed tube, a top sheet is arranged in the through groove, and the top sheet is connected to the fixed tube; a top head is arranged on the top sheet and extends to the inside of the fixed tube; the insertion rod is inserted into the fixed tube and abuts against the top head, so that the top sheet expands to the outside of the fixed tube and is tightly attached to the bone.

[0006] By adopting the above technical solution, the insertion rod can effectively abut against the top head after being inserted into the fixing tube, so that the top plate expands outward and is in close contact with the bone. This structure not only enhances the connection strength between the implant and the bone, reduces the risk of dislocation or displacement, but also can maintain a stable fixed state during long-term use, avoiding the bone wear and loosening problems that are prone to occur in traditional barb designs, and significantly improves the service life of the implant.

[0007] Preferably, one end of the top sheet is configured as a connecting end fixedly connected to the fixed tube, and the other end is suspended, and the area between the connecting end and the suspended end is the abutment portion; the abutment portion is inclined relative to the connecting end, and the abutment portion is inclined toward the inside of the fixed tube.

[0008] By adopting the above technical solution, one end of the top sheet is fixedly connected to the fixed tube, and the other end is suspended, forming a deformable structure. When the rod is inserted into the fixed tube and abuts the top head, the abutting portion of the top sheet will expand to the outside of the fixed tube, so that the top sheet is in close contact with the bone. This design not only increases the contact area between the implant and the bone and improves the stability of fixation, but also reduces local pressure and avoids bone damage and loosening caused by a single fixing point. At the same time, the elastic properties of the top sheet enable it to adapt to the slight movement of the bone to a certain extent, further improving the stability and service life of the implant.

[0009] Preferably, the suspended end of the top sheet is bent toward the inside of the fixing tube to form a top head, and the insertion rod abuts against the top head so that the portion between the two ends of the top sheet is in close contact with the bone; and the top sheet is elastic.

[0010] By adopting the above technical solution, when the insertion rod is inserted into the fixing tube and abuts against the head, the part between the two ends of the top sheet will expand outward and fit tightly against the bone, ensuring the stability of the implant in the bone. At the same time, the elastic design of the top sheet enables the top sheet to better adapt to the shape changes of the bone, reducing the risk of bone wear and top sheet loosening caused by rigid contact during long-term use, thereby improving the service life and reliability of the implant.

[0011] Preferably, one end of the top plate connected to the fixed tube is bent toward the inside of the fixed tube to form a top head, and the area between the top head and the suspended end and the area between the top head and the connecting end are both abutment parts, and the insertion rod abuts against the top head, so that the abutment part is in close contact with the bone.

[0012] By adopting the above technical solution, the insertion rod abuts against the top head, so that the area between the two ends of the top sheet (i.e., the abutment portion) is in close contact with the bone. This design allows the top sheet to contact the bone more evenly when it is pushed by the insertion rod, increasing the contact area and improving the stability of fixation. At the same time, the design of the top head allows the top sheet to be more reliably unfolded under the action of the insertion rod, reducing local stress concentration and the risk of bone damage. Therefore, this solution not only improves the fixation effect of the implant, but also extends its service life.

[0013] Preferably, a spring tenon is provided on the insertion rod, and the spring tenon abuts against the top sheet and applies a thrust to the top sheet, so that the top sheet is in close contact with the bone.

[0014] By adopting the above technical solution, the spring tenon arranged on the insertion rod can exert a continuous thrust on the top plate, ensuring that the top plate always maintains close contact with the bone, thereby enhancing the stability of the implant and increasing the service life of the implant.

[0015] Preferably, both ends of the top sheet are arranged as connecting ends and fixedly connected to the fixing head; the middle position of the top sheet is arranged as an abutting portion, and the positions on both sides of the abutting portion are arranged as deformation portions, and the deformation portions are elastic; and one end of the deformation portion connected to the abutting portion is inclined toward the inside of the fixing tube; The push head is arranged on the side of the abutment portion facing the inside of the fixing tube, and the insertion rod abuts against the push head so that the deformation portion deflects toward the outside of the fixing tube, thereby making the abutment portion close to the bone.

[0016] By adopting the above technical solution, the middle position of the top plate is set as the abutment part, and the positions on both sides are set as the deformation part. The deformation part is elastic, so that when the insertion rod abuts against the top head, the insertion rod pushes the deformation part to swing outside the fixing tube, and maintains stability under the action of its own elasticity, and pushes the top plate to abut against the bone, thereby improving the firmness and reliability of the fixation.

[0017] Preferably, the top sheet includes a spring sheet and a friction sheet, one end of the spring sheet is fixedly connected to the fixed tube, and the other end is suspended, and the friction sheet is arranged on the side of the spring sheet facing the outside of the fixed tube and is hinged to the suspended end of the spring sheet; The push head is arranged on the side of the spring piece facing the inside of the fixing tube, and the insertion rod abuts against the push head, thereby pushing the spring piece to move outside the fixing tube and making the friction plate abut against the bone.

[0018] By adopting the above technical solution, the design of the spring sheet makes the top sheet have good elasticity, which can generate an outward thrust when the insertion rod abuts against the top head, so that the friction sheet is in close contact with the bone, increasing the reliability and stability of the fixation. At the same time, the setting of the friction sheet further enhances the friction with the bone, effectively preventing the implant from loosening and falling off during long-term use, and improving the service life of the implant and the comfort of the patient.

[0019] Preferably, a slot is provided on the side wall of the insertion rod, and the top head is engaged with the slot.

[0020] By adopting the above technical solution, the slots on the side wall of the insertion rod and the clamping fit of the top head ensure the reliable fixation between the insertion rod and the fixing tube, avoiding the implant from coming out or shifting during human activities, and improving the stability of the implant. At the same time, this structural design simplifies the installation process, reduces the difficulty of surgery, and improves the success rate of surgery.

[0021] Preferably, a guide groove is provided on the side wall of the insertion rod, the guide groove is provided along the length direction of the insertion rod, and the clamping groove is located inside the guide groove.

[0022] By adopting the above technical solution, the guide groove ensures the positioning accuracy of the insertion rod during the insertion process, avoids the insertion rod from being deflected or misplaced, ensures the accurate docking of the head and the slot, and enhances the stability of the structure.

[0023] In summary, the present invention includes at least one of the following beneficial technical effects: 1. Through the contact between the insertion rod and the top head, the top sheet expands to the outside of the fixing tube and adheres closely to the bone, which increases the contact area and fixing strength between the implant and the bone, effectively prevents the implant from falling out or shifting during human activities, and improves the stability of the implant; 2. The top sheet has an elastic design, which can generate an outward thrust when the rod is inserted, so that the top sheet fits closely with the bone, reducing bone wear under traditional barb or screw fixation methods and extending the service life of the implant; 3. The snap-fit ​​structure between the insertion rod and the top head ensures a firm connection between the insertion rod and the fixing tube, further improving the overall stability of the implant, while simplifying the installation process and facilitating the doctor's operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the overall structure of the bone and joint repair implant in Example 1 of the present application; Figure 2 is a schematic diagram of the exploded structure of the bone and joint repair implant in Example 1 of the present application; Figure 3 is a cross-sectional view of the fixed cylinder in Example 1 of the present application; Figure 4 is a cross-sectional view of the fixed cylinder in Example 2 of the present application; Figure 5 is a cross-sectional view of the fixing handle in Example 3 of the present application; Figure 6 is a cross-sectional view of the fixed cylinder in Example 4 of the present application; Figure 7It is a schematic diagram of the top plate of Example 4 of the present application when it swings to the outside of the fixed tube, and at the same time shows the structure of the elastic limiting plate.

[0025] Markings in the accompanying drawings: 1, joint surface; 2, fixing handle; 21, support plate; 22, insertion rod; 221, spring tenon; 222, slot; 223, guide slot; 224, elastic limit plate; 23, fixing cylinder; 231, through slot; 24, top plate; 241, top head; 242, spring sheet; 243, friction plate; 244, connecting end; 245, abutment portion. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-7 The present invention is described in further detail.

[0027] Example 1 The bone and joint repair implant provided in the present application embodiment is referred to Figure 1 and Figure 2 , including a joint surface 1 and a fixed handle 2. The fixed handle 2 includes a support plate 21, an insertion rod 22 and a fixed cylinder 23. The support plate 21 is fixedly connected to the end of the insertion rod 22, and the insertion rod 22 is inserted in the fixed cylinder 23. A through groove 231 is provided on the side wall of the fixed cylinder 23, and a top sheet 24 is provided in the through groove 231, and the top sheet 24 is connected to the fixed cylinder 23. A top head 241 extending to the inside of the fixed cylinder 23 is provided on the top sheet 24.

[0028] When the implant is in use, a hole is first made at the damaged part of the bone joint for the insertion of the fixing tube 23, and then the insertion rod 22 is inserted into the fixing tube 23. During the insertion of the insertion rod 22 into the fixing tube 23, it will abut against the top head 241, thereby pushing the top plate 24 to expand to the outside of the fixing tube 23 and fit tightly against the bone, thereby achieving the effect of improving the reliability of implant fixation and reducing excessive bone wear during long-term use.

[0029] Specifically, the top sheet 24 is elastic, one end of the top sheet 24 is set as a connecting end 244 fixedly connected to the fixed tube 23, and the other end is suspended, and the area between the connecting end 244 and the suspended end is a contact portion 245. The contact portion 245 is inclined relative to the connecting end 244, and the contact portion 245 is inclined to the inside of the fixed tube 23. The suspended end of the top sheet 24 is bent toward the inside of the fixed tube 23 to form a head 241.

[0030] The insertion rod 22 is inserted into the fixing tube 23 and abuts against the top head 241, so that the top sheet 24 abuts against the solid, and because the spring sheet 242 has a certain elasticity, the top sheet 24 will adapt to the surface shape of the bone and fit the bone, so that there is surface contact between the top sheet 24 and the bone, so as to improve stability, reduce wear during long-term use, and reduce the probability of loosening.

[0031] Reference Figure 3The abutment portion 245 of the top sheet 24 is relatively inclined to the connection end 244, which enables the top sheet 24 to expand outward more effectively when the top sheet 24 is pushed by the insertion rod 22. The angle of the abutment portion 245 can be adjusted according to actual needs to ensure that the top sheet 24 has a larger contact area with the bone when expanding, thereby improving the reliability of fixation.

[0032] In order to achieve relative fixation between the insertion rod 22 and the fixing tube 23, a slot 222 is provided on the surface of the insertion rod 22. The slot 222 can be engaged with the top head 241 to prevent the axial movement of the insertion rod 22 and prevent the insertion rod 22 from falling off.

[0033] Furthermore, a guide groove 223 is provided on the side wall of the insertion rod 22, and the guide groove 223 is provided along the length direction of the insertion rod 22, and the clamping groove 222 is located inside the guide groove 223. During the insertion of the insertion rod 22, the top head 241 can slide and cooperate with the guide groove 223, thereby improving the positioning accuracy of the insertion rod 22, avoiding the situation that the insertion rod 22 is deflected or misplaced, and at the same time ensuring the accurate docking of the top head 241 and the clamping groove 222, thereby enhancing the stability of the structure.

[0034] The implementation principle of this embodiment is as follows: when the insertion rod 22 is inserted into the fixed tube 23 and abuts against the head 241, the top sheet 24 is pushed by the insertion rod 22 and expands outside the fixed tube 23, so that the abutment portion 245 of the top sheet 24 is in close contact with the bone. Since the top sheet 24 is elastic, it can maintain good contact with the bone, thereby improving the fixation reliability of the implant. In addition, the design of the top sheet 24 reduces friction with the bone, avoids the problems of bone damage and loosening of the barb, and prolongs the service life of the implant.

[0035] Example 2 The bone joint repair implant provided in the present embodiment is different from that in Example 1 in that: Figure 4 The top plate 24 includes a spring sheet 242 and a friction sheet 243. One end of the spring sheet 242 is fixedly connected to the fixed cylinder 23, and the other end is suspended. The friction sheet 243 is arranged on the side of the spring sheet 242 facing the outside of the fixed cylinder 23 and is hinged to the suspended end of the spring sheet 242. The top head 241 is arranged on the side of the spring sheet 242 facing the inside of the fixed cylinder 23.

[0036] When the insertion rod 22 is inserted into the fixing tube 23 and abuts against the head 241, the spring sheet 242 is pushed by the insertion rod 22 and moves to the outside of the fixing tube 23, so that the friction sheet 243 abuts against the bone. Since the spring sheet 242 and the head 241 are elastic, the friction sheet 243 can maintain good contact with the bone, thereby improving the fixation reliability of the implant.

[0037] Example 3 The bone joint repair implant provided in the present embodiment is different from that in Example 1 in that: Figure 5 One end of the top sheet 24 connected to the fixed tube 23 (i.e., the connecting end 244) is bent toward the inside of the fixed tube 23 to form a top head 241, and the area between the top head 241 and the suspended end and the area between the top head 241 and the connecting end 244 are both abutment portions 245.

[0038] When the insertion rod 22 is inserted into the fixing tube 23, the insertion rod 22 pushes the top sheet 24, so that the abutment portion 245 is in close contact with the bone. In addition, the abutment portion 245 can evenly contact with the bone, increasing the contact area, improving the stability of the fixation, and extending its service life.

[0039] Example 4 The bone joint repair implant provided in the present embodiment is different from that in Example 1 in that: Figure 6 , both ends of the top sheet 24 are set as connecting ends 244 and fixedly connected to the fixed head; the middle position of the top sheet 24 is set as an abutting portion 245, and the positions on both sides of the abutting portion 245 are set as deformation portions, and the deformation portions are elastic. The end of the deformation portion connected to the abutting portion 245 is inclined toward the inside of the fixed cylinder 23, so that in the initial state, the abutting portion 245 is located inside the fixed cylinder 23. The top head 241 is set on the side of the abutting portion 245 facing the inside of the fixed cylinder 23.

[0040] Therefore, refer to Figure 6 and Figure 7 When the insertion rod 22 is inserted into the fixed tube 23, the insertion rod 22 pushes the top head 241 and the abutment portion 245 to move outside the fixed tube 23, and the deformation portion will change from being inclined toward the inside of the fixed tube 23 to being inclined toward the outside of the fixed tube 23 and maintain this state (the principle is the same as that of the spring clip), thereby pushing the abutment portion 245 to abut against the bone, thereby achieving fixation.

[0041] In order to achieve the relative fixation between the insertion rod 22 and the fixed tube 23, an elastic limiting piece is fixedly provided on the surface of the insertion rod 22. Before inserting the insertion rod 22 into the fixed tube 23, the elastic limiting piece is folded and closely attached to the insertion rod 22, so that the insertion rod 22 can be smoothly inserted into the fixed tube 23. After the insertion rod 22 is inserted into the fixed tube 23, the elastic limiting piece will automatically open, thereby abutting against the inner wall of the top sheet 24 and limiting the axial movement of the insertion rod 22, preventing the insertion rod 22 from loosening.

[0042] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bone and joint repair implant, characterized in that: It comprises a joint surface (1) and a fixing handle (2); The fixed handle (2) comprises a support plate (21), an insertion rod (22) and a fixed tube (23); the support plate (21) is fixedly connected to the end of the insertion rod (22), and the insertion rod (22) is inserted into the fixed tube (23); A through slot (231) is provided on the side wall of the fixing tube (23), a top sheet (24) is arranged in the through slot (231), and the top sheet (24) is connected to the fixing tube (23); a top head (241) is provided on the top sheet (24) and extends into the interior of the fixing tube (23); the insertion rod (22) is inserted into the fixing tube (23) and abuts against the top head (241), so that the top sheet (24) expands toward the outside of the fixing tube (23) and is in close contact with the bone.

2. The bone and joint repair implant according to claim 1, characterized in that: One end of the top sheet (24) is arranged as a connecting end (244) fixedly connected to the fixed tube (23), and the other end is suspended in the air; the area between the connecting end (244) and the suspended end is an abutment portion (245); the abutment portion (245) is inclined relative to the connecting end (244), and the abutment portion (245) is inclined towards the interior of the fixed tube (23).

3. The bone and joint repair implant according to claim 2, characterized in that: The suspended end of the top sheet (24) is bent toward the inside of the fixing tube (23) to form a top head (241), and the insertion rod (22) abuts against the top head (241) so that the portion between the two ends of the top sheet (24) is in close contact with the bone; and the top sheet (24) is elastic.

4. The bone and joint repair implant according to claim 2, characterized in that: One end of the top plate (24) connected to the fixing tube (23) is bent toward the inside of the fixing tube (23) to form a top head (241); the area between the top head (241) and the suspended end and the area between the top head (241) and the connecting end (244) are both abutment portions (245); the insertion rod (22) abuts against the top head (241), so that the abutment portion (245) is in close contact with the bone.

5. The bone and joint repair implant according to claim 4, characterized in that: The insertion rod (22) is provided with a spring tenon (221), and the spring tenon (221) abuts against the top sheet (24) and applies a thrust to the top sheet (24), thereby making the top sheet (24) closely attached to the bone.

6. The bone and joint repair implant according to claim 1, characterized in that: Both ends of the top sheet (24) are arranged as connecting ends (244) and are fixedly connected to the fixing head; the middle position of the top sheet (24) is arranged as an abutting portion (245), and positions on both sides of the abutting portion (245) are arranged as deformation portions, and the deformation portions are elastic; one end of the deformation portion connected to the abutting portion (245) is inclined toward the inside of the fixing tube (23); The push head (241) is arranged on a side of the abutment portion (245) facing the interior of the fixing tube (23); the insertion rod (22) abuts against the push head (241) so that the deformation portion is deflected toward the exterior of the fixing tube (23), thereby making the abutment portion (245) closely attached to the bone.

7. The bone and joint repair implant according to claim 1, characterized in that: The top plate (24) comprises a spring plate (242) and a friction plate (243); one end of the spring plate (242) is fixedly connected to the fixed cylinder (23), and the other end is suspended in the air; the friction plate (243) is arranged on a side of the spring plate (242) facing the outside of the fixed cylinder (23) and is hinged to the suspended end of the spring plate (242); The push head (241) is arranged on a side of the spring sheet (242) facing the interior of the fixing tube (23), and the insertion rod (22) abuts against the push head (241), thereby pushing the spring sheet (242) to move toward the exterior of the fixing tube (23) and causing the friction sheet (243) to abut against the bone.

8. The bone and joint repair implant according to claim 1, characterized in that: A clamping groove (222) is provided on the side wall of the insertion rod (22), and the top head (241) is clamped and matched with the clamping groove (222) to achieve fixation of the insertion rod (22) and the fixing cylinder (23).

9. The bone joint repair implant according to claim 8, characterized in that: A guide groove (223) is provided on the side wall of the insertion rod (22), the guide groove (223) is provided along the length direction of the insertion rod (22), and the clamping groove (222) is located inside the guide groove (223).

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