Joint local repair prosthesis

Abstract

The utility model discloses a joint local repair prosthesis which comprises a base body and a handle body, and the base body is made of high polymer materials with biocompatibility. The handle body is made of a high polymer material with biocompatibility, one end of the handle body is fixedly connected with the base body, an anti-rotation groove is formed in the peripheral wall of the handle body, and the anti-rotation groove extends in the length direction of the handle body. According to the technical scheme, the installation stability of the joint local repair prosthesis can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a local joint repair prosthesis. Background Art

[0002] A partial joint repair prosthesis is a medical device used to treat articular cartilage damage. It primarily repairs localized joint surface damage rather than replacing the entire joint. This prosthesis typically fills the damaged area, restoring the smoothness and function of the joint surface. The use of a partial joint repair prosthesis can delay the need for total joint replacement, offering patients a more conservative and minimally invasive treatment option.

[0003] However, existing partial joint repair prostheses have several limitations. Traditionally designed prostheses often lack effective anti-rotation mechanisms, which can cause the prosthesis to rotate or shift during use. This rotation not only compromises the prosthesis's fixation but can also cause additional wear and damage to the surrounding healthy cartilage tissue. Furthermore, prosthetic instability can cause discomfort to the patient and hinder the recovery of joint function. These issues severely limit the long-term effectiveness and patient satisfaction of existing partial joint repair prostheses. Utility Model Content

[0004] The main purpose of the utility model is to provide a local joint repair prosthesis, aiming to improve the installation stability of the local joint repair prosthesis.

[0005] To achieve the above-mentioned purpose, the local joint repair prosthesis proposed in the present invention includes a base and a handle body, the material of the base is a biocompatible polymer material; the material of the handle body is a biocompatible polymer material, one end of the handle body is fixedly connected to the base, and an anti-rotation groove is formed on the peripheral wall of the handle body, and the anti-rotation groove extends in the length direction of the handle body.

[0006] Optionally, the handle body has an insertion end away from the base body, and the anti-rotation groove extends to the end surface of the insertion end.

[0007] Optionally, the base and the handle are integrally formed.

[0008] Optionally, the number of the handle bodies is at least two, each of the handle bodies is fixedly connected to the base body, and all of the handle bodies are located on the same side of the base body.

[0009] Optionally, the groove wall surface of the anti-rotation groove is a concave arc surface.

[0010] Optionally, the number of the anti-rotation grooves is at least two, and at least two of the anti-rotation grooves are spaced apart and distributed in the circumferential direction of the handle body.

[0011] Optionally, the connection between the handle and the base is smoothly transitioned.

[0012] Optionally, the base includes a proximal end surface and an articular surface that are relatively arranged, and a peripheral surface connecting the proximal end surface and the articular surface, and the handle is connected to the proximal end surface; wherein,

[0013] The connection between the articular surface and the peripheral surface has a smooth transition.

[0014] Optionally, the base includes a proximal end surface and an articular surface that are relatively arranged, and a peripheral surface connecting the proximal end surface and the articular surface, and the handle is connected to the proximal end surface; wherein,

[0015] The surfaces of the proximal end surface and the handle body are both provided with a coating, and the material of the coating is hydroxyapatite, pure titanium or tantalum metal.

[0016] Optionally, the base includes a proximal end surface and an articular surface that are relatively arranged, and a peripheral surface connecting the proximal end surface and the articular surface, and the handle is connected to the proximal end surface; wherein,

[0017] The peripheral surface is an arc surface.

[0018] Optionally, the base includes a proximal end surface and an articular surface that are relatively arranged, and a peripheral surface connecting the proximal end surface and the articular surface, and the handle is connected to the proximal end surface; wherein,

[0019] The articular surface is an outwardly convex arc surface; or,

[0020] The joint surface includes a flat surface portion and a curved surface portion, and the flat surface portion is connected to the peripheral surface through the curved surface portion.

[0021] Optionally, the handle includes a cylinder and a cone, one end of the cylinder is fixedly connected to the base, the other end of the cylinder is connected to one end of the cone, and the anti-rotation groove extends from the cylinder to the cone; wherein,

[0022] The diameter of the cone gradually decreases in a direction away from the cylinder.

[0023] Optionally, the end of the cylinder away from the base is formed as the first end, and the end of the conical body connected to the first end is formed as the second end; wherein,

[0024] The diameter of the second end is set larger than the diameter of the first end.

[0025] The local joint repair prosthesis of the utility model technical solution effectively solves the problem of easy rotation and displacement of the prosthesis in the prior art by providing an anti-rotation groove extending along the length direction on the peripheral wall of the handle body. This design significantly enhances the bite force between the prosthesis and the surrounding bone tissue, and improves the stability and anti-rotation ability of the prosthesis. The anti-rotation groove can not only prevent the prosthesis from rotating unnecessary during use, but also promote the ingrowth of bone tissue, further enhancing the fixation effect of the prosthesis. Such a structural design not only reduces the potential damage to the surrounding healthy cartilage tissue, but also improves the long-term stability of the prosthesis, thereby improving the patient's comfort and joint function recovery effect. At the same time, since both the base and the handle body are made of biocompatible polymer materials, the biosafety and long-term performance of the prosthesis are further ensured, providing patients with a safer and more effective local joint repair solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the structure of the local joint repair prosthesis of the utility model when implanted into the femoral condyle;

[0028] Figure 2 This is a schematic diagram of the structure of the local joint repair prosthesis of the utility model when implanted into the femoral head;

[0029] Figure 3 This is a schematic structural diagram of an embodiment of a partial joint repair prosthesis of the present invention;

[0030] Figure 4 This is a structural diagram of another embodiment of the partial joint repair prosthesis of the present invention;

[0031] Figure 5 is a partial cross-sectional schematic diagram of an embodiment of a base body;

[0032] Figure 6 It is a partial cross-sectional schematic diagram of another embodiment of the base.

[0033] Description of Figure Numbers:

[0034] 100. Partial joint repair prosthesis; 1. Base; 11. Proximal surface; 12. Articular surface; 121. Planar portion; 122. Curved portion; 13. Peripheral surface; 2. Handle; 21. Anti-rotation groove; 22. Cylinder; 221. First end; 23. Conical body; 231. Insertion end; 232. Second end.

[0035] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, the descriptions of "first", "second", etc. in this utility model are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, "and / or" in the full text includes three solutions. Taking A and / or B as an example, it includes technical solution A, technical solution B, and technical solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, and must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0039] The present utility model provides a partial joint repair prosthesis 100 .

[0040] In the embodiment of the present utility model, Figures 1 to 6 As shown, the local joint repair prosthesis 100 includes a base 1 and a handle 2. The base 1 is made of a biocompatible polymer material; the handle 2 is made of a biocompatible polymer material, one end of the handle 2 is fixedly connected to the base 1, and an anti-rotation groove 21 is formed on the peripheral wall of the handle 2, and the anti-rotation groove 21 extends in the length direction of the handle 2.

[0041] Specifically, base 1 is the primary component of the partial joint repair prosthesis 100, used to replace the damaged joint surface. Base 1 is made of a biocompatible polymer, meaning it will not cause rejection in the human body and is suitable for long-term implantation. Possible materials for base 1 include, but are not limited to, polyetheretherketone (PEEK), polyetherketoneketone (PEKK), and ultra-high molecular weight polyethylene (UHMWPE). These materials offer excellent mechanical properties and wear resistance, mimicking the function of natural joints.

[0042] The handle 2 connects the base 1 to the bone tissue and serves to secure the prosthesis within the bone. The handle 2 is also constructed from a biocompatible polymer material. It can be the same material as the base 1, or other suitable polymers can be used. One end of the handle 2 is fixedly connected to the base 1. This connection can be integrally formed or secured by other methods (such as adhesive bonding or hot-melt bonding).

[0043] The anti-rotation groove 21 extends along the length of the handle 2 and can be linear or spiral. The function of the anti-rotation groove 21 is to increase the contact area and friction between the handle 2 and the surrounding bone tissue to prevent the prosthesis from rotating during use.

[0044] It can be understood that the local joint repair prosthesis 100 of the technical solution of the present invention effectively solves the problem of easy rotation and displacement of the prosthesis in the prior art by providing an anti-rotation groove 21 extending along the length direction on the peripheral wall of the handle body 2. This design significantly enhances the bite force between the prosthesis and the surrounding bone tissue, and improves the stability and anti-rotation ability of the prosthesis. The anti-rotation groove 21 can not only prevent the prosthesis from rotating unnecessary during use, but also promote the growth of bone tissue, further enhancing the fixation effect of the prosthesis. Such a structural design not only reduces the potential damage to the surrounding healthy cartilage tissue, but also improves the long-term stability of the prosthesis, thereby improving the patient's comfort and joint function recovery effect. At the same time, since the base 1 and the handle body 2 are both made of biocompatible polymer materials, the biosafety and long-term performance of the prosthesis are further ensured, providing patients with a safer and more effective local joint repair solution.

[0045] In some embodiments, the handle 2 has an insertion end 231 away from the base 1 , and the anti-rotation groove 21 extends to the end surface of the insertion end 231 .

[0046] Specifically, the insertion end 231 is the end of the handle 2 that inserts into bone tissue. The anti-rotation groove 21 extends not only along the circumferential wall of the handle 2 but also onto the end surface of the insertion end 231. This design increases the overall length and contact area of the anti-rotation groove 21, further enhancing the anti-rotation effect. Furthermore, the groove extending to the end surface serves as a guide during implantation, facilitating accurate positioning of the prosthesis.

[0047] In some embodiments, the base 1 and handle 2 are integrally formed. This refers to the base 1 and handle 2 being manufactured as a single unit through a single manufacturing process (such as injection molding or 3D printing), rather than being manufactured separately and then joined. This design improves the overall strength of the prosthesis, reduces potential problems at the joints, and simplifies the manufacturing process.

[0048] In some embodiments, there are at least two handles 2, each of which is fixedly connected to the base 1, and all of which are located on the same side of the base 1. It will be appreciated that a design with multiple handles 2 can increase the stability and anti-rotational capability of the prosthesis. The number of handles 2 can be determined based on specific application requirements and the patient's anatomy, with two or three handles 2 being common.

[0049] In some embodiments, the wall surface of the anti-rotation groove 21 is a concave arc surface. Specifically, a concave arc surface refers to a groove wall that presents an inwardly concave curved surface. Compared to a flat surface, a concave arc surface provides a larger surface area, increasing the contact area between the handle body 2 and the surrounding bone tissue. Furthermore, a concave arc surface provides more space for bone tissue growth, facilitating bone tissue growth into the groove and further enhancing the fixation of the prosthesis. Finally, compared to a sharp right-angled edge, a curved edge can reduce local stress concentration and reduce irritation to surrounding tissue.

[0050] In some embodiments, the number of anti-rotation grooves 21 is at least two, and the at least two anti-rotation grooves 21 are spaced apart in the circumferential direction of the handle 2. Specifically, "at least two" means that the number of anti-rotation grooves 21 can be two, three, four, or more, and the specific number can be determined according to the size of the handle 2 and the desired anti-rotation effect.

[0051] "Circumferentially spaced apart" means that the anti-rotation grooves 21 are evenly or regularly distributed around the circumference of the handle 2. For example, if there are two anti-rotation grooves 21, they may be on opposite sides of the handle 2; if there are three anti-rotation grooves 21, they may be distributed at a 120-degree angle around the surface of the handle 2.

[0052] The multiple anti-rotation grooves 21 can provide anti-rotation forces from different directions, greatly improving the anti-rotation capability of the prosthesis.

[0053] In some embodiments, the connection between the handle 2 and the base 1 is smoothly transitioned.

[0054] A "smooth transition" refers to the absence of sharp corners or abrupt changes in the connection between the handle 2 and the base 1, which instead exhibits a smooth, curved surface. This design can be achieved in a variety of ways. For example, in some embodiments, a fillet with a certain radius can be used at the connection, creating an arc at the interface between the two parts. In other embodiments, a gradually changing curve from the handle 2 to the base 1 can be designed, allowing the two parts to blend naturally. In still other embodiments, filler material can be added at the connection to create a smooth transition area.

[0055] This smooth transition design has many advantages over other options. First, it significantly reduces the risk of stress concentration, reduces the possibility of cracks or breakage in the prosthesis during use, and improves the overall strength and durability of the prosthesis. Second, the smooth surface reduces irritation and wear on the surrounding soft tissues, reduces the risk of postoperative inflammation and pain, and is conducive to the patient's rapid recovery. In addition, this design also improves the biomechanical properties of the prosthesis, makes the force transmission more uniform, and helps the prosthesis better simulate the function of natural joints. From a manufacturing perspective, the smooth transition design simplifies the production process, reduces possible manufacturing defects, and improves the consistency and reliability of the product. Finally, this design also has good aesthetics, which can improve patients' psychological acceptance.

[0056] In some embodiments, the base 1 includes a proximal surface 11 and an articular surface 12 disposed opposite to each other, and a peripheral surface 13 connecting the proximal surface 11 and the articular surface 12, and the handle 2 is connected to the proximal surface 11; wherein,

[0057] The connection between the articular surface 12 and the peripheral surface 13 is smoothly transitioned.

[0058] Specifically, "opposite arrangement" means that the proximal surface 11 and the articular surface 12 are on opposite sides of the base 1. The implementation method of the smooth transition between the articular surface 12 and the peripheral surface 13 can be referred to above and will not be repeated here.

[0059] The smooth transition between the articular surface 12 and the peripheral surface 13 not only improves the mechanical properties of the prosthesis, reduces stress concentration, and reduces irritation to surrounding soft tissue, thus reducing postoperative complications. Furthermore, this design facilitates the flow of synovial fluid, helping to maintain normal lubrication of the joint.

[0060] In some embodiments, both the proximal surface 11 and the handle 2 are coated with a coating made of hydroxyapatite, pure titanium, or tantalum. The coating can be formed by plasma spraying, physical vapor deposition (PVD), chemical vapor deposition (CVD), electrophoretic deposition, or sol-gel methods.

[0061] The application of coatings significantly enhances the biocompatibility and bone integration of prostheses. Hydroxyapatite coatings promote bone growth and accelerate the integration of the prosthesis with bone tissue, while pure titanium and tantalum metal coatings provide excellent biocompatibility and corrosion resistance. These coatings not only accelerate postoperative recovery but also improve the long-term stability of the prosthesis. Overall, this design fully considers the mechanical properties, biocompatibility, and long-term stability of the prosthesis, providing patients with a safer, more effective, and durable joint repair solution, which is expected to significantly improve treatment outcomes and patients' quality of life.

[0062] In some embodiments, the peripheral surface 13 is an arc-shaped surface. The smooth transition of the arc-shaped surface can minimize irritation and damage to surrounding soft tissues, helping to reduce postoperative inflammation and accelerate patient recovery. From a surgical perspective, the arc-shaped surface design also facilitates precise installation and adjustment by the doctor, improving the success rate of the operation.

[0063] In some embodiments, the articular surface 12 is a convex arc surface. Specifically, the "convex arc surface" refers to the articular surface 12 presenting an outwardly protruding arc surface. This design can be achieved in a variety of ways, such as a spherical surface with a single curvature, an ellipsoidal surface, or a more complex free-form surface. The convex arc surface can be manufactured by precision machining, CNC milling, 3D printing, and other methods. This design is intended to mimic the morphology of a natural joint and provide better mechanical properties and motion function.

[0064] In other embodiments, the articular surface 12 includes a planar portion 121 and a curved portion 122, with the planar portion 121 connected to the peripheral surface 13 via the curved portion 122. The planar portion 121 is located in the center of the articular surface 12, while the curved portion 122 connects the planar portion 121 and the peripheral surface 13. This design can be achieved through a combination of machining methods, such as first machining the planar portion and then forming the transitional curved portion 122 through precision milling or grinding. The curved portion 122 can be a simple arc transition or a more complex spline surface to achieve a smooth transition.

[0065] These two joint surface 12 design schemes each have their own advantages. The convex arc surface design is closer to the morphology of a natural joint and can provide better joint motion range and stability. It helps to optimize stress distribution and reduce local stress concentration, thereby reducing the risk of prosthesis wear and surrounding tissue damage. At the same time, this design is conducive to the uniform distribution of synovial fluid and improves lubrication. The design of the combination of the flat portion 121 and the curved portion 122 provides greater flexibility for certain specific joint repair needs while maintaining some natural joint morphology. The flat portion 121 can provide a larger load-bearing area, while the curved portion 122 ensures a smooth transition with the surrounding tissue. This design can be suitable for certain specific types of joint injuries or special biomechanical requirements.

[0066] Preferably, the roughness Ra value of the joint surface 12 does not exceed 2 microns, and preferably the Ra value is ≤ 0.1 microns.

[0067] In some embodiments, the handle 2 includes a cylindrical body 22 and a conical body 23, one end of the cylindrical body 22 is fixedly connected to the base 1, and the other end of the cylindrical body 22 is connected to one end of the conical body 23, and the anti-rotation groove 21 extends from the cylindrical body 22 to the conical body 23; wherein,

[0068] The diameter of the tapered body 23 gradually decreases in a direction away from the cylindrical body 22 .

[0069] Specifically, the cylindrical portion 22 can be manufactured by turning, milling, or 3D printing. Its diameter can be determined based on the specific joint size and load-bearing requirements. The cylindrical portion 22 provides a stable connection structure.

[0070] The conical body 23 can be manufactured by precision turning, grinding, or 3D printing. The purpose of the conical design is to facilitate implantation and improve initial stability. The taper can be uniform or gradual, depending on the design requirements and manufacturing process.

[0071] In some embodiments, the end of the cylinder 22 away from the base 1 is formed as a first end 221, and the end of the cone 23 connected to the first end 221 is formed as a second end 232;

[0072] The diameter of the second end 232 is larger than the diameter of the first end 221 .

[0073] Specifically, a region with a sudden change in diameter is formed at the junction between the end (first end 221) of the cylindrical body 22 and the beginning (second end 232) of the conical body 23. The diameter of the second end 232 is larger than that of the first end 221, creating an outwardly flared "shoulder" structure at the junction.

[0074] When the prosthesis is implanted in the bone tissue, this protruding "shoulder" structure forms a mechanical barrier with the surrounding bone tissue. If the prosthesis tends to move outward, this larger diameter part will generate friction and resistance with the bone tissue, effectively preventing the prosthesis from falling out.

[0075] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A partial joint repair prosthesis, characterized in that: include: A substrate (1), wherein the substrate (1) is made of a biocompatible polymer material; as well as A handle body (2) is made of a biocompatible polymer material, one end of the handle body (2) is fixedly connected to the base body (1), an anti-rotation groove (21) is formed on the peripheral wall of the handle body (2), and the anti-rotation groove (21) extends in the length direction of the handle body (2).

2. The partial joint repair prosthesis according to claim 1, characterized in that: The handle (2) has an insertion end (231) away from the base (1), and the anti-rotation groove (21) extends to the end surface of the insertion end (231); and / or, The base body (1) and the handle body (2) are integrally formed; and / or, The number of the handle bodies (2) is at least two, each of the handle bodies (2) is fixedly connected to the base body (1), and all of the handle bodies (2) are located on the same side of the base body (1).

3. The partial joint repair prosthesis according to claim 1, characterized in that: The groove wall surface of the anti-rotation groove (21) is a concave arc surface.

4. The partial joint repair prosthesis according to claim 1, characterized in that: The number of the anti-rotation grooves (21) is at least two, and the at least two anti-rotation grooves (21) are spaced apart and distributed in the circumferential direction of the handle body (2).

5. The partial joint repair prosthesis according to claim 1, characterized in that: The connection between the handle (2) and the base (1) is smooth and transitional.

6. The partial joint repair prosthesis according to claim 1, characterized in that: The base (1) includes a proximal end surface (11) and a joint surface (12) arranged opposite to each other, and a peripheral surface (13) connecting the proximal end surface (11) and the joint surface (12), and the handle (2) is connected to the proximal end surface (11); wherein, The connection between the articular surface (12) and the peripheral surface (13) is smoothly transitioned; and / or, The surfaces of the proximal end surface (11) and the handle body (2) are both provided with a coating, and the material of the coating is hydroxyapatite, pure titanium or tantalum metal.

7. The partial joint repair prosthesis according to claim 1, characterized in that: The base (1) includes a proximal end surface (11) and a joint surface (12) arranged opposite to each other, and a peripheral surface (13) connecting the proximal end surface (11) and the joint surface (12), and the handle (2) is connected to the proximal end surface (11); wherein, The peripheral surface (13) is an arc surface.

8. The partial joint repair prosthesis according to claim 1, characterized in that: The base (1) includes a proximal end surface (11) and a joint surface (12) arranged opposite to each other, and a peripheral surface (13) connecting the proximal end surface (11) and the joint surface (12), and the handle (2) is connected to the proximal end surface (11); wherein, The joint surface (12) is an outwardly convex arc surface; or, The joint surface (12) includes a flat surface portion (121) and a curved surface portion (122), and the flat surface portion (121) is connected to the peripheral surface (13) through the curved surface portion (122).

9. The partial joint repair prosthesis according to claim 1, characterized in that: The handle (2) comprises a cylindrical body (22) and a conical body (23), one end of the cylindrical body (22) is fixedly connected to the base (1), the other end of the cylindrical body (22) is connected to one end of the conical body (23), and the anti-rotation groove (21) extends from the cylindrical body (22) to the conical body (23); wherein, The diameter of the conical body (23) gradually decreases in a direction away from the cylindrical body (22).

10. The partial joint repair prosthesis according to claim 9, characterized in that: The end of the cylindrical body (22) away from the base body (1) is formed as a first end (221), and the end of the conical body (23) connected to the first end (221) is formed as a second end (232); wherein, The diameter of the second end (232) is set larger than the diameter of the first end (221).

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