Biomimetic hip joint uncoated femoral stem prosthesis for animals

Abstract

A biomimetic uncoated femoral stem prosthesis for animal hip joints features a bent stem with a spherical head prosthesis at one end that adapts to a crown-shaped acetabular cup or acetabular cup prosthesis. The first stem portion of the stem, which is inserted into the medullary cavity, is densely covered with holes extending inwards. Later-growing bone tissue can penetrate these holes, promoting bone ingrowth between the prosthesis and the stem, providing strong restraint, and enhancing the connection stability between the prosthesis and the femur.

Description

Technical Field

[0001] This utility model relates to animal orthopedic prostheses, specifically to a non-coated femoral stem prosthesis for a biomimetic hip joint in animals. Background Technology

[0002] The hip joint of small animals (such as dogs and cats) is an important joint that connects the hind limbs, spine, and trunk. It consists of the femoral head, acetabulum, and ligaments. For some small animals with conditions such as femoral head necrosis, osteoarthritis, congenital or acquired hip dislocation, total / partial hip replacement is the preferred treatment. In hip replacement surgery, the remaining femoral head is first osteotomized, then the stem of the femoral head replacement prosthesis is placed into the medullary cavity of the femur, and then the head prosthesis is placed into the acetabular cup or acetabular cup prosthesis to cooperate with it.

[0003] To promote the integration of the prosthesis with the hip joint and extend its lifespan, the applicant previously filed a patent application entitled "Femoral Head Replacement Prosthesis for Small Dogs" (publication number CN213346176U), which disclosed the following: a stem prosthesis with a head prosthesis at one end, a cup prosthesis overlying the head prosthesis, and a bio-coating covering the surfaces of the stem and cup prostheses. This bio-coating is described as a titanium powder coating, titanium bead coating, or hydroxyapatite coating, which is believed to promote the growth of bone marrow within the medullary cavity and acetabulum, thus integrating the stem prosthesis with the femur and the cup prosthesis with the acetabulum. However, the applicant found that the later-growing bone tissue merely adhered to the outer surface of the prosthesis, and the stability of the connection between the prosthesis and the bone tissue needed improvement. Summary of the Invention

[0004] This invention provides a non-coated femoral stem prosthesis for animal biomimetic hip joints, which promotes bone ingrowth between bone tissue and the prosthesis and improves the connection stability between the prosthesis and bone tissue.

[0005] To achieve the above objectives, the technical solution adopted is as follows: a non-coated femoral stem prosthesis for a bionic hip joint in animals, wherein one end of the stem prosthesis, which is bent in shape, is provided with a spherical head prosthesis that is adapted to the movement of a crown-shaped acetabular cup or acetabular cup prosthesis, and the first stem body of the stem prosthesis, which is used for insertion into the medullary cavity, is densely covered with holes extending into the interior of the stem body.

[0006] Compared with the prior art, the technical effect of this utility model is as follows: the first stem of the stem prosthesis, which is inserted into the medullary cavity, is densely covered with holes extending into the stem body. The bone tissue that grows later can penetrate into the holes on the stem body, promoting the bone ingrowth effect between the bone tissue and the prosthesis, providing a strong binding effect on the stem prosthesis, and improving the connection stability between the prosthesis and the femur. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the present invention;

[0008] Figure 2 This is a cross-sectional view of the present invention. Detailed Implementation

[0009] The following is in conjunction with the appendix Figure 1-2 The present invention will be further described in detail below, including related content:

[0010] A non-coated femoral stem prosthesis for a biomimetic hip joint for animals, wherein the stem prosthesis 10 is bent in shape and one end is provided with a spherical head prosthesis 20 that is adapted to the movement of a crown-shaped acetabular cup or acetabular cup prosthesis. The first stem body 11 of the stem prosthesis 10 for insertion into the medullary cavity is densely covered with holes 111 extending into the interior of the stem body.

[0011] In the above technical solution, the first stem body 11 of the stem prosthesis 10, which is inserted into the medullary cavity, is densely covered with holes 111 extending into the interior of the stem body. The bone tissue that grows later can penetrate into the holes 111 on the first stem body 11, promoting the bone ingrowth effect between the bone tissue and the stem prosthesis 10, providing a strong binding effect on the stem prosthesis 10, and improving the connection stability between the stem prosthesis 10 and the femur.

[0012] As a preferred embodiment, the holes 111 are densely distributed around the first stem body 11, and bone tissue in various positions within the femoral medullary cavity can grow into the different holes 111 in the circumferential direction of the first stem body 11, thereby improving the stability of the later connection between the stem prosthesis 10 and the femur.

[0013] Furthermore, the cores of the holes 111 are arranged to intersect each other and intersect on the outside or inside of the first stem body 11, so that the cores of the holes 111 in different positions on the first stem body 10 have different directions, and the bone tissue can grow in multiple dimensions along different holes 111, making it difficult to separate the stem prosthesis 10 from the femur.

[0014] It should be noted that, considering the large number of holes 111, not all the cores of the holes 111 intersect at the same point. The holes 111 in different directions in the circumferential direction of the first handle body 10 can be arranged in a non-parallel, intersecting manner.

[0015] In addition, such as Figure 2As shown, the head prosthesis 20 and the first handle 11 are connected by a second handle 12. Connecting holes and connecting posts are respectively provided on the adjacent ends of the first handle 11 and the second handle 12. The connecting holes and connecting posts form an interference fit to create a bent handle prosthesis 10. The handle prosthesis 10 consists of two handle sections: the first handle 11 and the second handle 12. The two handle sections are connected by connecting holes and connecting posts to form a detachable fit. When the holes 111 on the first handle 11 are processed, the second handle 12 is separated from the first handle 11 to avoid structural interference during the processing of the first handle 11. After each section is processed, they are assembled, making the overall processing more convenient.

[0016] Finally, in this application, the femoral head prosthesis 20 is preferably made of PEEK material, whose chemical composition is polyether resin. PEEK is an excellent material for femoral head repair, possessing properties such as light weight, corrosion resistance, and high temperature resistance. It can effectively replace femoral head repair, avoiding adverse reactions such as rejection. It also has good self-lubricating properties, which helps reduce the resistance to movement between the femoral head prosthesis 20 and the acetabular cup or acetabular cup prosthesis. The stem prosthesis 10 is made of titanium alloy or cobalt-chromium-molybdenum alloy, which also possesses properties such as high strength, corrosion resistance, and high temperature resistance.

Claims

1. A non-coated femoral stem prosthesis for a biomimetic hip joint in animals, wherein one end of the stem prosthesis (10) is provided with a spherical head prosthesis (20) that is adapted to the movement of a spherical crown-shaped acetabular cup or acetabular cup prosthesis, characterized in that: The first stem (11) of the stem prosthesis (10) for insertion into the medullary cavity is densely covered with holes (111) extending into the stem body. The cores of the holes (111) are arranged to intersect each other and the cores of the holes (111) intersect on the outside or inside of the first stem body (11).

2. The uncoated femoral stem prosthesis for a biomimetic hip joint in animals according to claim 1, characterized in that: Holes (111) are densely distributed around the first handle (11).

3. The uncoated femoral stem prosthesis for a biomimetic hip joint in animals according to claim 1, characterized in that: The head prosthesis (20) and the first stem (11) are connected by a transitional connection through the second stem (12). The first stem (11) and the second stem (12) are respectively provided with a connecting hole and a connecting post at their adjacent ends. The connecting hole and the connecting post form an interference fit to form a bent stem prosthesis (10).

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