Shoulder joint implant prosthesis

Abstract

The utility model belongs to the technical field of shoulder joint implant prostheses, and discloses a shoulder joint implant prosthesis. The shoulder joint implantation prosthesis comprises a humerus handle and a ball head, one end of the humerus handle is configured to be inserted into an inner cavity of the humerus, the humerus handle comprises an inserting part and a connecting part, a first protrusion is arranged on the outer wall of the connecting part, and a penetrating hole is formed in the connecting part; the ball head and the humerus handle are integrally arranged; the connecting part is sleeved with the ball head, and a groove is formed in the inner wall of the ball head; a connecting bridge is further arranged on the inner wall of the ball head. The bulb and the humerus handle are integrally arranged, assembly abrasion does not exist, the unexpected risk caused by the fact that particles enter the body is reduced, and the service life is long. The at least one first protrusion is clamped into the at least one groove in a one-to-one correspondence mode, the contact area of the ball head and the humerus handle is increased, and the connection strength of the ball head and the humerus handle is improved. And the at least one connecting bridge is arranged in the at least one penetrating hole in a one-to-one correspondence penetrating manner, so that the connecting strength is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of shoulder joint implant prosthesis, in particular to a shoulder joint implant prosthesis. Background Art

[0002] In the field of biomedical materials, joint replacement surgery is a common method for treating joint diseases, and its main purpose is to restore the patient's joint function by implanting an artificial joint prosthesis. Among them, the shoulder joint prosthesis implant is a common joint replacement surgical instrument, which is mainly used to treat shoulder joint diseases.

[0003] Traditional shoulder prosthesis implants include a humeral component and a head component. During manufacturing, the humeral component and the head component are processed into the required shapes respectively and then assembled together. The product inevitably has a combination relationship when using a multi-component combination. Since the shoulder prosthesis implant is installed in the human body, there may be micro-motion and wear in the assembled parts, thereby generating certain particles. The particles may enter the body and cause unexpected risks, such as inducing osteolysis in the bone tissue around the prosthesis implant. In addition, micro-motion of the assembled parts may cause failure of the joints between them, which may affect the service life of the product. Utility Model Content

[0004] The utility model aims to provide a shoulder joint implant prosthesis, which has no assembly wear, reduces the unexpected risk caused by particles entering the body, and has a longer service life. In addition, the connection strength is high.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A shoulder joint implant prosthesis, comprising:

[0007] A humeral stem, comprising an inserting portion and a connecting portion, wherein the inserting portion is configured to be inserted into an inner cavity of the humerus, the connecting portion is arranged on the inserting portion, the outer wall of the connecting portion is provided with at least one first protrusion, and the connecting portion is provided with at least one through hole;

[0008] A ball head is integrated with the humeral handle; the ball head is sleeved outside the connecting portion, and the inner wall of the ball head is provided with at least one groove, and at least one of the first protrusions is inserted into at least one of the grooves in a one-to-one correspondence; the inner wall of the ball head is also provided with at least one connecting bridge, and at least one of the connecting bridges is arranged in a one-to-one correspondence through at least one of the through holes.

[0009] Preferably, the plug-in portion is provided with at least one second protrusion, and the second protrusion can be clamped with the inner cavity of the humerus.

[0010] Preferably, the inserting portion is provided with a locking hole, and the shoulder joint implant prosthesis further comprises a screw, and the screw connects the humeral side wall with the humeral stem through the locking hole.

[0011] Preferably, two locking holes are arranged on the plug-in portion at intervals, and the angle between the axes of the two locking holes is 50 degrees to 65 degrees.

[0012] Preferably, one locking hole is arranged at the head of the plug-in portion and is located at the surgical neck of the humerus, and the other locking hole is arranged at the tail of the plug-in portion, and the angle between the axes of the two locking holes is 50 degrees.

[0013] Preferably, a guide groove is provided at the tail of the plug-in portion to assist the humeral stem in inserting into the inner cavity of the humerus.

[0014] Preferably, part or all of the structure of the plug-in portion is a porous structure.

[0015] Preferably, the humeral stem is made of titanium-tantalum alloy, and the ball head is made of zirconium oxide toughened alumina ceramic.

[0016] Preferably, the outer wall of the head of the plug-in portion follows the shape of the inner wall of the humerus.

[0017] Preferably, the plurality of first protrusions are arranged at intervals, and the first protrusions are a closed-loop structure surrounding the outer wall of the connecting portion, and the plurality of grooves are arranged corresponding to the plurality of first protrusions.

[0018] Beneficial effects of the utility model:

[0019] The shoulder joint implant prosthesis provided by the utility model includes a humeral stem and a ball head. The humeral stem includes an inserting portion and a connecting portion. The inserting portion is configured to be inserted into the inner cavity of the humerus. The connecting portion is arranged on the inserting portion. The outer wall of the connecting portion is provided with a first protrusion, and the connecting portion is provided with a through hole; the ball head is integrated with the humeral stem; the ball head is sleeved outside the connecting portion, and the inner wall of the ball head is provided with a groove; the inner wall of the ball head is also provided with a connecting bridge. The ball head and the humeral stem are integrated to eliminate assembly wear, reduce unexpected risks caused by particles entering the body, and prolong the service life of the shoulder joint implant prosthesis. At least one first protrusion is inserted into at least one groove in a one-to-one correspondence, thereby increasing the contact area between the ball head and the humeral stem and improving the connection strength between the ball head and the humeral stem. At least one connecting bridge is arranged in a one-to-one correspondence through at least one through hole, further improving the connection strength between the ball head and the humeral stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an exploded view of the shoulder joint implant prosthesis provided by the utility model;

[0021] Figure 2 It is a structural schematic diagram of the humeral handle involved in the utility model;

[0022] Figure 3 This is a schematic diagram of the state of the shoulder joint prosthesis implanted after completing step S21 involved in the present invention;

[0023] Figure 4 This is a schematic diagram of the state of the shoulder joint prosthesis implanted after completing step S22 involved in the present invention;

[0024] Figure 5 This is a schematic diagram of the state of the shoulder joint prosthesis implanted after completing step S23 involved in the present invention;

[0025] Figure 6 This is a schematic diagram of the state of the shoulder joint prosthesis implanted after completing step S24 involved in the utility model;

[0026] Figure 7 It is a schematic diagram of the state of the shoulder joint implant prosthesis after the ball head 2 is subjected to cold isostatic pressing in step S2 of the present invention;

[0027] Figure 8 It is a schematic diagram of the state of the shoulder joint implant prosthesis formed after completing step S4 of the utility model.

[0028] In the figure:

[0029] 1. humeral handle; 11. connecting part; 12. first protrusion; 13. penetration hole; 14. second protrusion; 15. locking hole; 16. head; 17. rod; 18. tail; 19. guide groove;

[0030] 2. Ball head;

[0031] 100, a first assembly mold; 200, a second assembly mold; 300, a third assembly mold. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] like Figure 1 to Figure 2As shown, the utility model provides a shoulder joint implant prosthesis, which includes a humeral stem 1 and a ball head 2. The humeral stem 1 includes an inserting portion and a connecting portion 11. The inserting portion is configured to be inserted into the inner cavity of the humerus. The connecting portion 11 is arranged on the inserting portion. The outer wall of the connecting portion 11 is provided with at least one first protrusion 12, and the connecting portion 11 is provided with at least one through hole 13; the ball head 2 is integrated with the humeral stem 1; the ball head 2 is sleeved outside the connecting portion 11, and the inner wall of the ball head 2 is provided with at least one groove, and at least one first protrusion 12 is correspondingly inserted into at least one groove; the inner wall of the ball head 2 is also provided with at least one connecting bridge, and at least one connecting bridge is correspondingly arranged in at least one through hole 13. The ball head 2 is integrated with the humeral stem 1, and there is no assembly wear, which reduces the unexpected risk caused by the entry of particles into the body, and prolongs the service life of the shoulder joint implant prosthesis. At least one first protrusion 12 is inserted into at least one groove in a one-to-one correspondence, thereby increasing the contact area between the ball head 2 and the humeral stem 1 and improving the connection strength between the ball head 2 and the humeral stem 1. At least one connecting bridge is arranged in a one-to-one correspondence through at least one penetration hole 13, thereby further improving the connection strength between the ball head 2 and the humeral stem 1.

[0037] Optionally, in this embodiment, the connecting portion 11 is a cone, the cone angle of the cone is 7 degrees, and the structure is simple. In other embodiments, the connecting portion 11 can also be a cuboid, a cube, a prism or other structures, not limited to this embodiment.

[0038] Optionally, in this embodiment, a plurality of first protrusions 12 are arranged at intervals, and the first protrusions 12 are a closed-loop structure surrounding the outer wall of the connecting portion 11, and a plurality of grooves are arranged corresponding to the plurality of first protrusions 12, which further increases the contact area between the ball head 2 and the humeral stem 1, and improves the connection strength between the ball head 2 and the humeral stem 1. In other embodiments, the first protrusion 12 may be a block-shaped or other form of structure, as long as it can increase the contact area between the ball head 2 and the humeral stem 1, and is not limited to this embodiment.

[0039] Optionally, the plug-in portion is provided with at least one second protrusion 14, and the second protrusion 14 can be clamped with the inner cavity of the humerus. After the shoulder joint implant prosthesis is installed in the inner cavity of the humerus, the second protrusion 14 is clamped with the inner cavity of the humerus, increasing the holding force between the shoulder joint implant prosthesis and the humerus. Optionally, in the present embodiment, at least one second protrusion 14 is arranged on the head 16 of the plug-in portion, which has a simple structure, is easy to manufacture, and is also convenient for plugging. Optionally, in the present embodiment, a plurality of second protrusions 14 are arranged at intervals, and the second protrusion 14 is a closed-loop structure surrounding the outer wall of the humeral handle 1, which is simple to manufacture and further increases the holding force between the shoulder joint implant prosthesis and the humerus. In other embodiments, the second protrusion 14 may be a block-shaped or other forms of structure, as long as it can increase the holding force between the shoulder joint implant prosthesis and the humerus, and is not limited to the present embodiment.

[0040] Optionally, the plug-in portion is provided with a locking hole 15, and the shoulder joint implant prosthesis further comprises a screw, which connects the humeral side wall with the humeral stem 1 through the locking hole 15, thereby further reinforcing the shoulder joint implant prosthesis and better fixing it on the humeral cavity. Figure 2 As shown, two locking holes 15 are arranged at intervals on the plug-in part, and the angle between the axes of the two locking holes 15 is 50 degrees to 65 degrees, which is convenient for angular fixation and makes the fixation more secure. Further, in this embodiment, one locking hole 15 is arranged at the head 16 of the plug-in part and is located at the surgical neck of the humerus, and the other locking hole 15 is arranged at the tail 18 of the plug-in part, and the angle between the axes of the two locking holes 15 is 50 degrees. The bone at the surgical neck is thicker, which is convenient for the screw to pass through, making the fixation more secure. The angle between the axes of the two locking holes 15 is 50 degrees, which makes the fixation effect better.

[0041] Optionally, the tail 18 of the plug-in portion is provided with a guide groove 19 for assisting the humeral stem 1 to be inserted into the inner cavity of the humerus, so as to facilitate the insertion of the shoulder joint implant prosthesis. Optionally, in this embodiment, the two guide grooves 19 are arranged opposite to each other, and the structure is simple.

[0042] Optionally, part or all of the structure of the plug-in portion is a porous structure. Part or all of the structure of the plug-in portion is a porous structure, which can better increase the amount of bone ingrowth after the shoulder joint implant prosthesis is implanted and ensure the stability of the prosthesis, and is simple to manufacture. Optionally, the porosity of the porous structure is 75%-85%, and the pore size is 200μm-500μm. Optionally, in the present embodiment, the porosity is 80% and the pore size is 450μm, which can better increase the amount of bone ingrowth after the shoulder joint implant prosthesis is implanted while ensuring the strength. Optionally, in the present embodiment, the rod portion 17 and the tail portion 18 of the plug-in portion are porous structures, which are convenient for manufacturing.

[0043] Optionally, in this embodiment, the material of the humeral stem 1 is titanium-tantalum alloy, which has good biocompatibility, corrosion resistance, and wear resistance, and the material of the ball head 2 is zirconia-toughened alumina ceramics, which has good biocompatibility, high strength, high toughness, etc. In addition, in other embodiments, the material of the humeral stem 1 can be tantalum.

[0044] Optionally, in this embodiment, the outer wall of the head 16 of the plug-in part follows the inner wall of the humerus to facilitate plugging. Optionally, in this embodiment, the rod 17 of the plug-in part is a cylindrical structure, which is easy to manufacture.

[0045] like Figures 3 to 8 As shown, the method for preparing a shoulder joint implant prosthesis comprises:

[0046] S1, forming the humeral stem 1: forming the humeral stem forming material to form the humeral stem 1;

[0047] S2. Preforming of a shoulder joint implant prosthesis: installing the humeral stem 1 on a mold, and positioning the connection portion 11 of the humeral stem 1 in the mold, filling the mold with a ball head molding material and sealing the mold, wherein the ball head molding material covers the first protrusion 12, and penetrates through a hole 13 to form a ball head 2 at the connection portion 11, and performing cold isostatic pressing on the ball head 2 using a cold isostatic pressing device to form a preformed shoulder joint implant prosthesis;

[0048] S3, pre-sintering treatment: using a sintering furnace to sinter the preformed shoulder joint implant prosthesis;

[0049] S4. Hot isostatic pressing: Use hot isostatic pressing equipment to perform hot isostatic pressing on the pre-sintered shoulder joint implant prosthesis to obtain a formed shoulder joint implant prosthesis.

[0050] The preparation method of the shoulder joint implant prosthesis integrates the ball head 2 and the humeral stem 1, and there is no assembly wear, which reduces the unexpected risk caused by the entry of particles into the body. The product has a long service life and improves the connection strength between the ball head 2 and the humeral stem 1. When the ball head 2 is formed by cold isostatic pressing, the ball head 2 is subjected to pressure from all directions during the forming process, so that the density of the ball head 2 is uniform and it is not easy to deform during sintering. Through pre-sintering and hot isostatic pressing, the bonding strength between the ball head 2 and the humeral stem 1 is increased, and the density of the ball head 2 and the humeral stem 1 is improved.

[0051] Optionally, in this embodiment, the humeral stem molding material is titanium-tantalum alloy powder, and the ball head molding material is zirconium oxide toughened alumina ceramic powder; in step S2, the pressure of cold isostatic pressing is 250Mpa-400MPa; in step S3, the pre-sintering temperature is 1300℃-1600℃, and the holding time is 1-5 hours; in step S4, the hot isostatic pressing temperature is 1200℃-1600℃, and the holding time is 1-5 hours. The humeral stem molding material is titanium-tantalum alloy powder, and the highest temperature of the ball head 2 during the preparation process is 1600℃, which is lower than the melting point of the titanium-tantalum alloy and will not cause a significant change in the performance of the humeral stem 1. In addition, in other embodiments, the humeral stem molding material can be tantalum powder, the purity of the tantalum powder is ≥4N, and the particle size of the tantalum powder is 45μm~150μm.

[0052] Optionally, in this embodiment, in step S1, the humeral stem molding material is printed by a 3D printer to form the humeral stem 1, wherein the 3D printer is an electron beam selective melting device (EBSM), which has high working efficiency and good molding effect. In addition, since the humeral stem 1 is formed by printing, the humeral stem 1 can be customized.

[0053] Optionally, in this embodiment, if Figures 3 to 6 As shown, the mold includes a first assembly mold 100, a second assembly mold 200 and a third assembly mold 300 which are sequentially covered, and the cavity formed by the first assembly mold 100, the second assembly mold 200 and the third assembly mold 300 is shaped in accordance with the shape of the ball head 2. In step S2, the humeral stem 1 is mounted on the mold, and the connecting portion 11 of the humeral stem 1 is located in the mold, and the ball head molding material is filled in the mold and sealed, specifically: S21, the humeral stem 1 is mounted on the first assembly mold 100, and the connecting portion 11 is arranged in the cavity of the first assembly mold 100; S22, the second assembly mold 200 is covered on the first assembly mold 100; S23, the ball head molding material is filled in the first assembly mold 100 and the second assembly mold 200; S24, the third assembly mold 300 is covered on the second assembly mold 200 and sealed. Such operation facilitates the installation of the humeral stem 1 and the filling of the ball head molding material.

[0054] In step S2, after the ball head 2 is subjected to cold isostatic pressing and before forming a preformed shoulder joint implant prosthesis, the ball head 2 is further subjected to shape processing: the ball head 2 after the cold isostatic pressing is subjected to shape processing to meet the requirements of the design drawings.

[0055] In step S4, after the pre-sintered shoulder joint implant prosthesis is subjected to hot isostatic pressing and before the formed shoulder joint implant prosthesis is obtained, it also includes forming processing: grinding and polishing the shoulder joint implant prosthesis after hot isostatic pressing so that the shape and surface quality of the shoulder joint implant prosthesis meet the use requirements.

[0056] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A shoulder joint implant prosthesis, characterized in that: include: A humeral stem (1) comprises an inserting portion and a connecting portion (11), wherein the inserting portion is configured to be inserted into an inner cavity of the humerus, the connecting portion (11) is arranged on the inserting portion, the outer wall of the connecting portion (11) is provided with at least one first protrusion (12), and the connecting portion (11) is provided with at least one through hole (13); The ball head (2) is integrally arranged with the humeral shaft (1); the ball head (2) is sleeved outside the connecting portion (11), and the inner wall of the ball head (2) is provided with at least one groove, and at least one of the first protrusions (12) is inserted into at least one of the grooves in a one-to-one correspondence; the inner wall of the ball head (2) is also provided with at least one connecting bridge, and at least one of the connecting bridges is penetrated in at least one of the through holes (13) in a one-to-one correspondence.

2. The shoulder joint implant according to claim 1, characterized in that: The plug-in portion is provided with at least one second protrusion (14), and the second protrusion (14) can be clamped with the inner cavity of the humerus.

3. The shoulder joint implant according to claim 1, characterized in that: The plug-in portion is provided with a locking hole (15), and the shoulder joint implant prosthesis further comprises a screw, and the screw connects the humeral side wall with the humeral stem (1) through the locking hole (15).

4. The shoulder joint implant according to claim 3, characterized in that: Two locking holes (15) are arranged at intervals on the plug-in portion, and the angle between the axes of the two locking holes (15) is 50 degrees to 65 degrees.

5. The shoulder joint implant according to claim 4, characterized in that: One of the locking holes (15) is arranged at the head (16) of the plug-in part and is located at the surgical neck of the humerus, and the other locking hole (15) is arranged at the tail (18) of the plug-in part, and the angle between the axes of the two locking holes (15) is 50 degrees.

6. The shoulder joint implant according to claim 1, characterized in that: The tail portion (18) of the plug-in portion is provided with a guide groove (19) for assisting the humeral stem (1) to be inserted into the inner cavity of the humerus.

7. The shoulder joint implant according to claim 1, characterized in that: Part or all of the structure of the plug-in portion is a porous structure.

8. The shoulder joint implant according to any one of claims 1 to 7, characterized in that: The material of the humeral stem (1) is a titanium-tantalum alloy, and the material of the ball head (2) is zirconium oxide toughened alumina ceramics.

9. The shoulder joint implant according to any one of claims 1 to 7, characterized in that: The outer wall of the head (16) of the plug-in portion follows the shape of the inner wall of the humerus.

10. The shoulder joint implant according to any one of claims 1 to 7, characterized in that: The plurality of first protrusions (12) are arranged at intervals, and the first protrusions (12) are a closed-loop structure surrounding the outer wall of the connecting portion (11), and the plurality of grooves are arranged corresponding to the plurality of first protrusions (12).

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