A bone joint repair implant

Abstract

This application relates to the field of orthopedic medical devices, and more particularly to a bone and joint repair implant. The implant includes an articular surface and a fixation stem. The fixation stem comprises a support plate, a rod, and a fixation cylinder, with the rod inserted into the fixation cylinder. A through groove is formed on the side wall of the fixation cylinder, and a top plate is disposed within the through groove. The top plate is connected to the fixation cylinder, and a head extending into the interior of the fixation cylinder is provided on the top plate. The rod is inserted into the fixation cylinder and abuts against the head, thereby causing the top plate to expand outward from the fixation cylinder and adhere tightly to the bone. This application, through its unique top plate design, significantly improves the fixation effect and stability of the implant, effectively preventing implant dislodgement and displacement, extending the lifespan of the implant, and improving the patient's treatment outcome.

Description

Technical Field

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

[0002] Currently, osteoarthritic implants are widely used to treat cartilage defects caused by lesions or injuries. These implants typically consist of an articular surface and a fixation stem, designed to replace damaged cartilage tissue and restore joint function. However, existing implants are prone to dislodgement or displacement during long-term use, especially during physical activity, affecting implantation outcomes and patients' quality of life.

[0003] US Patent No. 20230338153A1 discloses a joint surface reconstruction implant, which includes an implant, a support plate for the implant, and a fixation part for the implant. The implant is made of high molecular weight polyethylene and coated with a biocompatible material. The implant is fixed to the support plate. The fixation part of the implant consists of a lower rod made of titanium alloy and barbs 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 barbs to achieve stable fixation of the implant.

[0004] However, in the above technical solution, relying solely on a set of barbs for fixation has two limitations: firstly, its stability needs further improvement; secondly, after prolonged use, the friction between the barbs and the bone intensifies, easily leading to bone damage and barb loosening. These issues require further optimization. Summary of the Invention

[0005] This application provides a bone and joint repair implant that can stably connect with bone and is not prone to accelerated wear after prolonged use, thus having a long service life. The technical solution adopted is as follows:

[0006] An osteoarthritis repair implant, comprising an articular surface and a fixation stem;

[0007] The fixing handle includes a support plate, a plug rod, and a fixing cylinder; the support plate is fixedly connected to the end of the plug rod, and the plug rod is inserted into the fixing cylinder;

[0008] A through groove is provided on the side wall of the fixation cylinder, and a top plate is provided in the through groove and connected to the fixation cylinder; a top head is provided on the top plate extending into the interior of the fixation cylinder; the insertion rod is inserted into the fixation cylinder and abuts against the top head, thereby causing the top plate to expand outward from the fixation cylinder and fit tightly against the bone.

[0009] By adopting the above technical solution, the insertion rod can effectively abut against the top after being inserted into the fixation tube, thereby causing the top plate to expand outward and make close contact with the bone. This structure not only enhances the connection strength between the implant and the bone, reducing the risk of dislodgement or displacement, but also maintains a stable fixation state during long-term use, avoiding the bone wear and loosening problems that are prone to occur in traditional barb designs, and significantly improving the service life of the implant.

[0010] Preferably, one end of the top piece is configured as a connecting end that is fixedly connected to the fixed cylinder, and the other end is suspended. The area between the connecting end and the suspended end is an abutment portion. The abutment portion is inclined relative to the connecting end and is inclined towards the inside of the fixed cylinder.

[0011] By adopting the above technical solution, one end of the top piece is fixedly connected to the fixation cylinder, while the other end is suspended, forming a deformable structure. When the insertion rod is inserted into the fixation cylinder and abuts against the top head, the abutting part of the top piece expands outward from the fixation cylinder, allowing the top piece to make close contact with the bone. This design not only increases the contact area between the implant and the bone, improving the stability of fixation, but also reduces local pressure, avoiding bone damage and loosening caused by a single fixation point. At the same time, the elastic properties of the top piece allow it to adapt to the slight movements of the bone to a certain extent, further improving the stability and lifespan of the implant.

[0012] Preferably, the suspended end of the top piece is bent into the fixed cylinder to form a top head, and the insert rod abuts against the top head so that the portion between the two ends of the top piece is in close contact with the bone; and the top piece is elastic.

[0013] By adopting the above technical solution, when the insertion rod is inserted into the fixation tube and abuts against the top head, the portion between the two ends of the top plate will expand outward and fit tightly against the bone, ensuring the stability of the implant within the bone. At the same time, the elastic design of the top plate allows it to better adapt to changes in bone shape, reducing the risk of bone wear and top plate loosening caused by rigid contact during long-term use, thus improving the lifespan and reliability of the implant.

[0014] Preferably, the end of the top piece connected to the fixed cylinder is bent inward to form a top head. 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. The insertion rod abuts against the top head, thereby making the abutment parts fit tightly against the bone.

[0015] By employing the above-described technical solution, the insert and the cap abut against each other, ensuring that the area between the two ends of the cap (i.e., the abutment portion) is in close contact with the bone. This design allows the cap to make more even contact with the bone when subjected to the thrust of the insert, increasing the contact area and improving fixation stability. Simultaneously, the cap design allows the cap to unfold more reliably under the action of the insert, reducing localized stress concentration and lowering the risk of bone damage. Therefore, this solution not only improves the fixation effect of the implant but also extends its lifespan.

[0016] Preferably, the insertion rod is provided with a spring clip, which abuts against the top plate and applies a pushing force to the top plate, thereby making the top plate fit tightly against the bone.

[0017] By adopting the above technical solution, the spring clip on the insertion rod can apply a continuous pushing force to the top plate, ensuring that the top plate always maintains close contact with the bone, thereby enhancing the stability of the implant and improving its service life.

[0018] Preferably, both ends of the top plate are configured as connecting ends and fixedly connected to the fixing head; the middle position of the top plate is configured as an abutment part, and the positions on both sides of the abutment part are configured as deformation parts, the deformation parts being elastic; the end of the deformation part connected to the abutment part is inclined towards the inside of the fixing cylinder.

[0019] The top head is located on the side of the abutment portion facing the inside of the fixed cylinder. The insertion rod abuts against the top head, causing the deformable portion to tilt outwards from the fixed cylinder, thereby making the abutment portion fit tightly against the bone.

[0020] By adopting the above technical solution, the middle position of the top piece is set as the abutment part, and the two sides are set as the deformation parts. The deformation parts are elastic, so that when the insertion rod abuts with the top head, the insertion rod pushes the deformation parts to swing outward of the fixing cylinder, and maintains stability under its own elasticity, and pushes the top piece to abut with the bone, thereby improving the firmness and reliability of the fixation.

[0021] Preferably, the top piece includes a spring piece and a friction plate. One end of the spring piece is fixedly connected to the fixed cylinder, and the other end is suspended. The friction plate is located on the side of the spring piece facing the outside of the fixed cylinder and is hinged to the suspended end of the spring piece.

[0022] The top head is located on the side of the spring sheet facing the inside of the fixed cylinder, and the insert rod abuts against the top head, thereby pushing the spring sheet to move out of the fixed cylinder and causing the friction plate to abut against the bone.

[0023] By adopting the above technical solution, the design of the spring plate gives the top plate good elasticity, which can generate an outward thrust when the insertion rod and the top head abut, making the friction plate in close contact with the bone, increasing the reliability and stability of the fixation. At the same time, the setting of the friction plate further enhances the friction with the bone, effectively preventing the implant from loosening and falling out during long-term use, improving the lifespan of the implant and the patient's comfort.

[0024] Preferably, a slot is provided on the side wall of the insertion rod, and the top head engages with the slot.

[0025] By adopting the above technical solution, the slot on the side wall of the insertion rod and the snap-fit ​​of the top head ensure reliable fixation between the insertion rod and the fixing cylinder, preventing the implant from dislodging or shifting during human activity and improving the stability of the implant. At the same time, this structural design simplifies the installation process, reduces surgical difficulty, and increases the success rate of the surgery.

[0026] 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 slot is located inside the guide groove.

[0027] 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 skewed or misaligned, ensures the accurate docking of the top head and the slot, and enhances the stability of the structure.

[0028] In summary, the present invention has at least one of the following beneficial technical effects:

[0029] 1. By abutting the insert rod against the top, the top piece expands outward from the fixation cylinder and adheres tightly to the bone, increasing the contact area and fixation strength between the implant and the bone, effectively preventing the implant from dislodging or shifting during human activity, and improving the stability of the implant.

[0030] 2. The top piece has an elastic design that generates an outward thrust when the insertion rod is inserted, allowing the top piece to fit tightly against the bone, reducing bone wear as is done with traditional barbs or screws, and extending the lifespan of the implant;

[0031] 3. The snap-fit ​​structure between the insert and the top ensures a firm connection between the insert and the fixation tube, further improving the overall stability of the implant, while simplifying the installation process and making it easier for doctors to operate. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the bone and joint repair implant in Embodiment 1 of this application;

[0033] Figure 2 This is an exploded structural diagram of the osteoarthritis repair implant in Embodiment 1 of this application;

[0034] Figure 3 This is a cross-sectional view of the fixed cylinder in Embodiment 1 of this application;

[0035] Figure 4 This is a cross-sectional view of the fixed cylinder in Embodiment 2 of this application;

[0036] Figure 5 This is a cross-sectional view of the fixing handle in Embodiment 3 of this application;

[0037] Figure 6 This is a cross-sectional view of the fixed cylinder in Embodiment 4 of this application;

[0038] Figure 7 This is a schematic diagram of the top piece swinging to the outside of the fixed cylinder in Embodiment 4 of this application, and also shows the structure of the elastic limiting piece.

[0039] The following are labels in the attached diagram: 1. Joint surface; 2. Fixing handle; 21. Support plate; 22. Insert rod; 221. Spring latch; 222. Slot; 223. Guide slot; 224. Elastic limiting piece; 23. Fixing cylinder; 231. Through slot; 24. Top piece; 241. Top head; 242. Spring piece; 243. Friction piece; 244. Connecting end; 245. Abutment part. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-7 The present invention will be described in further detail below.

[0041] Example 1

[0042] The bone and joint repair implants provided in this application are referred to... Figure 1 and Figure 2 The device includes an articulated surface 1 and a fixing handle 2. The fixing handle 2 includes a support plate 21, a rod 22, and a fixing cylinder 23. The support plate 21 is fixedly connected to the end of the rod 22, and the rod 22 is inserted into the fixing cylinder 23. A through groove 231 is provided on the side wall of the fixing cylinder 23, and a top plate 24 is provided in the through groove 231 and connected to the fixing cylinder 23. A top head 241 extending into the interior of the fixing cylinder 23 is provided on the top plate 24.

[0043] When using the implant, a hole is first drilled at the site of the bone joint injury to allow the fixation tube 23 to be inserted. Then, the insertion rod 22 is inserted into the fixation tube 23. During the insertion of the insertion rod 22 into the fixation tube 23, it will abut against the top 241, thereby pushing the top plate 24 to expand outward from the fixation tube 23 and fit tightly against the bone, thus improving the fixation reliability of the implant and reducing excessive bone wear during long-term use.

[0044] Specifically, the top piece 24 is elastic. One end of the top piece 24 is configured as a connecting end 244, which is fixedly connected to the fixed cylinder 23, while the other end is suspended. The area between the connecting end 244 and the suspended end is the abutment portion 245. The abutment portion 245 is inclined relative to the connecting end 244 and slopes inward toward the interior of the fixed cylinder 23. The suspended end of the top piece 24 bends inward toward the interior of the fixed cylinder 23 to form the top head 241.

[0045] The insert rod 22 is inserted into the fixing cylinder 23 and abuts against the top head 241, thereby causing the top plate 24 to abut against the solid. Since the spring plate 242 has a certain elasticity, the top plate 24 will adapt to the shape of the bone surface and fit the bone, so that the top plate 24 and the bone have surface contact, thereby improving stability and reducing wear during long-term use, and reducing the probability of loosening.

[0046] Reference Figure 3 The abutment portion 245 of the top plate 24 is inclined relative to the connecting end 244, which allows the top plate 24 to expand outward more effectively when 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 plate 24 has a larger contact area with the bone during expansion, thereby improving the reliability of fixation.

[0047] In order to achieve relative fixation between the insertion rod 22 and the fixing cylinder 23, a slot 222 is provided on the surface of the insertion rod 22. The slot 222 can engage with the top head 241 to enable axial movement of the insertion rod 22 and prevent the insertion rod 22 from falling off.

[0048] Furthermore, a guide groove 223 is provided on the side wall of the insertion rod 22, the guide groove 223 is arranged along the length direction of the insertion rod 22, and the retaining groove 222 is located inside the guide groove 223. During the insertion process, the top head 241 can slide and engage with the guide groove 223, thereby improving the positioning accuracy of the insertion rod 22, avoiding the insertion rod 22 from being skewed or misaligned, and also ensuring the accurate docking of the top head 241 and the retaining groove 222, thus enhancing the stability of the structure.

[0049] The implementation principle of this embodiment is as follows: When the insertion rod 22 is inserted into the fixing cylinder 23 and abuts against the top head 241, the top plate 24 is pushed by the insertion rod 22 and expands outward from the fixing cylinder 23, thereby making the abutting portion 245 of the top plate 24 tightly adhere to the bone. Because the top plate 24 is elastic, it can maintain good contact with the bone, thereby improving the fixation reliability of the implant. Furthermore, the design of the top plate 24 reduces friction with the bone, avoiding bone damage and barb loosening, and extending the service life of the implant.

[0050] Example 2

[0051] The bone and joint repair implant provided in this application differs from that in Example 1 in that: (Referring to...) Figure 4The top piece 24 includes a spring piece 242 and a friction plate 243. One end of the spring piece 242 is fixedly connected to the fixed cylinder 23, and the other end is suspended. The friction plate 243 is located on the side of the spring piece 242 facing the outside of the fixed cylinder 23 and is hinged to the suspended end of the spring piece 242. The top head 241 is located on the side of the spring piece 242 facing the inside of the fixed cylinder 23.

[0052] When the insert rod 22 is inserted into the fixation cylinder 23 and abuts against the top head 241, the spring piece 242 is pushed by the insert rod 22 and moves outward from the fixation cylinder 23, thereby causing the friction piece 243 to abut against the bone. Because the spring piece 242 and the top head 241 are elastic, the friction piece 243 can maintain good contact with the bone, thereby improving the fixation reliability of the implant.

[0053] Example 3

[0054] The bone and joint repair implant provided in this application differs from that in Example 1 in that: (Referring to...) Figure 5 The end of the top plate 24 connected to the fixed cylinder 23 (i.e., the connecting end 244) is bent into the fixed cylinder 23 to form the 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 abutting parts 245.

[0055] When the insertion rod 22 is inserted into the fixing cylinder 23, the insertion rod 22 pushes the top plate 24, causing the abutment part 245 to fit tightly against the bone. Furthermore, the abutment part 245 can make uniform contact with the bone, increasing the contact area, improving the stability of the fixation, and extending its service life.

[0056] Example 4

[0057] The bone and joint repair implant provided in this application differs from that in Example 1 in that: (Referring to...) Figure 6 Both ends of the top plate 24 are configured as connecting ends 244 and fixedly connected to the fixing head; the middle position of the top plate 24 is configured as an abutment portion 245, and the two sides of the abutment portion 245 are configured as deformation portions, which are elastic. The end of the deformation portion connected to the abutment portion 245 is inclined inward toward the inside of the fixing cylinder 23, so that in the initial state, the abutment portion 245 is located inside the fixing cylinder 23. The top head 241 is provided on the side of the abutment portion 245 facing the inside of the fixing cylinder 23.

[0058] Therefore, refer to Figure 6 and Figure 7 When the insertion rod 22 is inserted into the fixing cylinder 23, the insertion rod 22 pushes the top head 241 and the abutment part 245 to move outward from the fixing cylinder 23, and the deformation part changes from tilting inward to tilting outward from the fixing cylinder 23 and maintains this state (the principle is the same as the spring clip hairpin), thereby pushing the abutment part 245 to abut against the bone, thereby achieving fixation.

[0059] To achieve relative fixation between the insertion rod 22 and the fixing cylinder 23, an elastic limiting piece is fixedly provided on the surface of the insertion rod 22. Before inserting the insertion rod 22 into the fixing cylinder 23, the elastic limiting piece is retracted and pressed tightly against the insertion rod 22, thereby allowing the insertion rod 22 to be smoothly inserted into the fixing cylinder 23. After the insertion rod 22 is inserted into the fixing cylinder 23, the elastic limiting piece will automatically open, thereby abutting against the inner wall of the top plate 24 and restricting the axial movement of the insertion rod 22, preventing the insertion rod 22 from loosening.

[0060] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A bone and joint repair implant, characterized in that: Includes articular surfaces (1) and a fixing handle (2); The fixing handle (2) includes a support plate (21), a plug rod (22) and a fixing cylinder (23); the support plate (21) is fixedly connected to the end of the plug rod (22), and the plug rod (22) is inserted into the fixing cylinder (23); A through groove (231) is provided on the side wall of the fixation tube (23), and a top piece (24) is provided in the through groove (231) and the top piece (24) is connected to the fixation tube (23); a top head (241) extending into the interior of the fixation tube (23) is provided on the top piece (24); the insertion rod (22) is inserted into the fixation tube (23) and abuts against the top head (241), thereby causing the top piece (24) to expand outward from the fixation tube (23) and fit tightly against the bone; The top piece (24) includes a spring piece (242) and a friction piece (243). One end of the spring piece (242) is fixedly connected to the fixed cylinder (23), and the other end is suspended. The friction piece (243) is located on the side of the spring piece (242) facing the outside of the fixed cylinder (23) and is hinged to the suspended end of the spring piece (242). The top head (241) is located on the side of the spring piece (242) facing the inside of the fixed cylinder (23), and the insertion rod (22) abuts against the top head (241), thereby pushing the spring piece (242) to move outward of the fixed cylinder (23) and causing the friction plate (243) to abut against the bone; The insert rod (22) has a slot (222) on its side wall. The top head (241) engages with the slot (222) to fix the insert rod (22) and the fixing cylinder (23).

2. The osteoarthritis repair implant according to claim 1, 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 slot (222) is located inside the guide groove (223).

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