Hip joint replacement system for small and medium-sized animals
By setting limiting protrusions at the junction of the femoral stem of the hip replacement system, the problem of the hip replacement system sinking after long-term use in the prior art is solved, and higher usage stability is achieved.
Patent Information
- Application Number
- CN202420778969.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-15
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-04-15
AI Technical Summary
The existing hip replacement system is prone to sinking problems after long-term use, resulting in femoral stem displacement and hip replacement failure.
A small and medium-sized animal hip replacement system is designed, and the limiting projection is set at the connection between the shank body and the shank of the femoral stem and the inside of the angle between the shank body and the shank body to prevent the shank body from sinking.
It effectively prevents the problem of sinking of the posterior shank body during long-term use, and improves the stability of use after hip replacement.
Smart Images
Figure CN222765318U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hip joints, in particular to a hip joint replacement system for small and medium-sized animals. Background Art
[0002] As people's quality of life improves, more and more people keep pets, and their requirements for the quality of life of pets are also correspondingly improved. With the development of veterinary clinical technology, various orthopedic technologies are used to improve the quality of life and movement status of animals. Among them, canine hip replacement surgery (THR) is recognized as the most typical example of small animal joint replacement surgery. The main indications for hip replacement surgery include hip dysplasia, femoral head necrosis, coxofemoral arthritis and irreparable femoral head fractures, among which canine hip dysplasia is a common disease of medium and large dogs.
[0003] At present, hip replacement surgery usually involves implanting a femoral stem into the medullary cavity. The fixation between the femoral stem and the natural bone can effectively solve problems such as hip dysplasia, femoral head necrosis, hip-femoral arthritis and irreparable femoral head fracture. However, the current hip replacement system will sink after long-term use, which can easily cause the femoral stem to move and lead to failure of hip replacement. Utility Model Content
[0004] The main purpose of the utility model is to provide a hip replacement system for small and medium-sized animals, aiming to improve the stability of use after hip replacement.
[0005] To achieve the above-mentioned purpose, the utility model provides a hip replacement system for small and medium-sized animals, comprising:
[0006] An acetabular cup having a first mounting groove;
[0007] A ball head assembly is provided with a second mounting groove, and the ball head assembly is rotatably mounted in the second mounting groove; and
[0008] The femoral stem includes a handle head and a handle body connected to the handle head, the handle body is inclined relative to the handle head, the handle head is installed in the second installation groove, and a limiting protrusion is provided at the connection between the handle body and the handle head, and the limiting protrusion is located on the inner side of the angle between the handle body and the handle head.
[0009] Optionally, the angle between the limiting protrusion and the handle body is an acute angle.
[0010] Optionally, a groove is provided on the surface of the handle body.
[0011] Optionally, the groove is in the shape of a long strip extending along the length direction of the handle body.
[0012] Optionally, the acetabular cup, the ball head assembly and the femoral stem are all made of TC4 ELI material.
[0013] Optionally, the surface layer of the handle body close to the handle head is set to a diamond structure.
[0014] Optionally, the ball head assembly includes a femoral ball head and a connecting piece, the femoral ball head is connected to the connecting piece, the femoral ball head is rotatably mounted in the first mounting groove, the connecting piece is provided with the second mounting groove, and the connecting piece is rotatably matched with the handle head.
[0015] Optionally, the femoral ball head is detachably connected to the connecting piece.
[0016] Optionally, the handle head, the handle body and the limiting protrusion are integrally formed.
[0017] Optionally, the handle body is tapered in a direction away from the handle head.
[0018] The technical solution of the utility model is to set a limiting protrusion at the connection between the handle body and the handle head, and set the limiting protrusion inside the angle between the handle body and the handle head. In this way, after the cabinet is implanted into the medullary cavity, the limiting protrusion can be abutted against the bone at the position of the lesser trochanter of the femur, and the limiting protrusion is used to abut and cooperate with the bone at the position of the lesser trochanter of the femur to limit the position of the handle after implantation into the medullary cavity, thereby preventing the handle from sinking after long-term use, that is, improving the stability of use after hip replacement. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0020] Figure 1 It is a schematic diagram of the structure of the small and medium-sized animal hip replacement system installed on the femur;
[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the hip replacement system for small and medium animals;
[0022] Figure 3 for Figure 2 Cross-sectional view of a hip replacement system for small and medium animals.
[0023] Description of Figure Numbers:
[0024] 10, acetabular cup; 11, first mounting groove; 20, ball head assembly; 21, femoral ball head; 211, third mounting groove; 22, connector; 221, second mounting groove; 30, femoral stem; 31, stem head; 32, stem body; 321, first groove; 322, diamond structure; 323, second groove; 33, limiting protrusion; 40, femoral
[0025] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is 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 the utility model.
[0029] The utility model provides a hip joint replacement system for small and medium-sized animals.
[0030] In the embodiment of the present utility model, Figures 1 to 3 As shown, Figure 1 A schematic diagram of a small and medium-sized animal hip replacement system according to the technical solution of the utility model installed on a femur 40 is provided. The small and medium-sized animals include but are not limited to cats, dogs, and the like.
[0031] Specifically, in the embodiment, the hip replacement system for small and medium-sized animals includes an acetabular cup 10, a ball head assembly 20 and a femoral stem 30. The acetabular cup 10 is provided with a first mounting groove 11; the ball head assembly 20 is provided with a second mounting groove 221, and the ball head assembly 20 is rotatably mounted in the second mounting groove 221; the femoral stem 30 includes a handle head 31 and a handle body 32 connected to the handle head 31, the handle body 32 is tilted relative to the handle head 31, and the handle head 31 is mounted in the second mounting groove 221, and a limiting protrusion 33 is provided at the connection between the handle body 32 and the handle head 31, and the limiting protrusion 33 is located on the inner side of the angle between the handle body 32 and the handle head 31.
[0032] Among them, the acetabular cup 10 is fixed to the acetabular socket, the ball head assembly 20 is installed in the first installation groove 11 and can rotate in the first installation groove 11, and the first installation groove 11 is set to a spherical shape that matches the shape of the ball head assembly 20. The handle head 31, the handle body 32 and the limiting protrusion 33 are integrally formed. The handle body 32 is used to be implanted in the medullary cavity, and the second installation groove 221 is set to a cylindrical shape that matches the shape of the handle body 32. The angle between the handle head 31 and the handle body 32 is an obtuse angle, and the position between the two side surfaces forming the obtuse angle is the inner side of the angle, that is, the limiting protrusion 33 is set between the two side surfaces forming the obtuse angle.
[0033] When the hip replacement system for small and medium-sized animals of the technical solution of the present application is installed on the femur through hip replacement surgery, the acetabular cup 10 is fixed to the acetabular socket by bone cement, the handle body 32 is implanted in the medullary cavity of the femur 40, and the limiting protrusion 33 abuts the position of the lesser trochanter of the femur 40.
[0034] The technical solution of the utility model is to set a limiting protrusion 33 at the connection between the handle body 32 and the handle head 31, and set the limiting protrusion 33 at the inner side of the angle between the handle body 32 and the handle head 31. In this way, after the cabinet is implanted into the medullary cavity, the limiting protrusion 33 can be abutted against the bone at the position of the lesser trochanter of the femur 40, and the limiting protrusion 33 can be used to abut and cooperate with the bone at the position of the lesser trochanter of the femur 40 to limit the handle body 32 to the position after implantation into the medullary cavity, thereby preventing the handle body 32 from sinking after long-term use, that is, improving the stability of use after hip replacement.
[0035] Further, the angle between the limiting protrusion 33 and the handle body 32 is an acute angle. Specifically, the angle between the limiting protrusion 33 and the handle body 32 is greater than 0° and greater than 90°, so that the limiting protrusion 33 is first tilted relative to the handle body 32, so that after the femoral stem 30 is implanted into the medullary cavity, the end of the femur 40 body can extend into the angle formed by the limiting protrusion 33 and the handle body 32, so that the femoral stem 30 and the femoral ball head 21 directly form a snap fit, which can prevent the handle body 32 from rotating in the medullary cavity, and improve the installation stability of the handle body 32 in the medullary cavity. Of course, in other embodiments, the angle between the limiting protrusion 33 and the handle body 32 can be a right angle.
[0036] In some embodiments, a groove is provided on the surface of the handle body 32. Specifically, the setting of the concave mold can prevent the surface of the handle body 32 from being relatively rounded, and prevent the handle body 32 from rotating in the medullary cavity. In other words, the installation stability of the handle body 32 in the medullary cavity is improved. Of course, in other embodiments, a convex portion can also be provided on the surface of the handle body 32.
[0037] Furthermore, the groove is in the shape of a long strip extending along the length direction of the handle body 32. It can be understood that this is equivalent to increasing the size of the groove, that is, further improving the installation stability of the handle body 32 in the medullary cavity. Of course, in other embodiments, multiple grooves can also be provided on the handle body 32, so that the multiple grooves are spaced apart along the length direction of the handle body 32.
[0038] In some embodiments, the handle 31, the handle body 32 and the limiting protrusion 33 are integrally formed. As we know, the integrally formed setting can reduce the production difficulty and the production process, thereby helping to reduce the production cost. Of course, in other embodiments, the handle 31, the handle body 32 and the limiting protrusion 33 can also be separately formed.
[0039] Furthermore, the handle head 31, the handle body 32 and the limiting protrusion 33 are integrally formed by TC4 ELI powder (Ti-6Al-4V ELI, titanium alloy) powder by using a powder bed electron beam melting process. Specifically, the femoral stem 30 integrally formed by using TC4 ELI powder and using a powder bed electron beam melting process has strong strength and is not easy to break under a large impact force. In addition, titanium alloy has biological activity, can promote the growth of osteoblasts, and promote the speed of fracture healing. Of course, in other embodiments, the handle head 31, the handle body 32 and the limiting protrusion 33 can also be integrally formed by polyetheretherketone.
[0040] In some embodiments, the ball head assembly 20 includes a femoral ball head 21 and a connector 22, the femoral ball head 21 is connected to the connector 22, the femoral ball head 21 is rotatably mounted in the first mounting groove 11, the connector 22 is provided with a second mounting groove 221, and the connector 22 is rotatably matched with the handle head 31. Specifically, the femoral ball head 21 can rotate relative to the acetabular cup 10, and the connector 22 can rotate relative to the handle head 31, so that the hip replacement system of the technical solution of the present application has two rotation positions. In this way, the incidence of prosthesis dislocation in hip replacement surgery can be effectively reduced. The setting of the double rotation position makes the distance between the femoral ball head 21 and the acetabulum larger, which can allow a greater range of motion, has higher stability and is not easy to dislocate, and has a lower degree of wear. Of course, in other embodiments, the ball head assembly 20 can also only be provided with the femoral ball head 21, and the femoral ball head 21 is connected to the handle head 31.
[0041] Further, the femoral ball head 21 is detachably connected to the connecting piece 22. Specifically, in the present embodiment, the femoral ball head 21 is provided with a third mounting groove 211, and the connecting piece 22 has a connecting head, which is inserted into the third mounting groove 211 so that the femoral ball head 21 and the connecting piece 22 are interference fit, so that the femoral ball head 21 and the connecting piece 22 can be made of different materials according to different needs, and are also easy to install. Among them, the femoral ball head 21 and the connecting piece 22 can also be detachably connected in other ways. For example: threaded connection, clamping, etc. Of course, in other embodiments, the femoral ball head 21 is fixedly connected to the connecting piece 22.
[0042] Furthermore, the acetabular cup 10, the ball head assembly 20 and the femoral stem 30 are all made of TC4 ELI material. Specifically, we know that TC4 ELI material has good toughness, corrosion resistance, wear resistance, etc. The acetabular cup 10, the connector 22 and the femoral stem 30 are all made of TC4 ELI material, so that the acetabular cup 10, the connector 22 and the femoral stem 30 have good toughness, corrosion resistance, wear resistance, etc., so that when the femoral ball head 21 rotates relative to the acetabular cup 10 and the connector 22 rotates relative to the handle head 31, wear is reduced, thereby improving the service life. At the same time, titanium alloy has biological activity, can promote the growth of osteoblasts, and promote the speed of fracture healing. Of course, in other embodiments, polyetheretherketone can also be used.
[0043] Furthermore, the inner layer of the handle body 32 and the outer surface of the femoral ball head 21 are smoothed, such as by using a grinding device, and the roughness thereof is Ra≤0.2μm. The outer surface of the connecting member 22 is smoothed, and the roughness thereof is Ra≤6.3μm.
[0044] In some embodiments, the handle body 32 is tapered in a direction away from the handle head 31. Specifically, the handle body 32 is tapered, so that during the process of implanting the handle body 32, the difficulty of implantation can be reduced.
[0045] In some embodiments, the surface of the handle body 32 near the handle head 31 is set as a diamond structure 322. Specifically, after the handle body 32 is implanted in the medullary cavity, the position where the surface of the handle body 32 is set as the diamond structure 322 is a position where more cancellous bone is distributed. The diamond structure 322 is a porous structure, which provides an attachment position for osteoblasts during osteoblast differentiation, and the porous structure is conducive to the attachment of a large number of osteoblasts, which is conducive to promoting the speed of fracture healing. Of course, in other embodiments, the surface of the handle body 32 near the handle head 31 can also be set as a dodecahedron structure, a cube structure, a regular tetrahedron structure, etc.
[0046] In some embodiments, a second mounting groove 221 is provided on one end surface of the handle body 32 near the handle head 31. Specifically, the second mounting groove 221 is used to facilitate medical personnel to use a surgical hammer to hammer the handle body 32 into the medullary cavity during the implantation of the handle body 32 into the medullary cavity. Of course, in other embodiments, the handle body 32 may not be provided with the second mounting groove 221.
[0047] 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 changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A hip replacement system for small and medium-sized animals, characterized in that: include: An acetabular cup having a first mounting groove; A ball head assembly is provided with a second mounting groove, and the ball head assembly is rotatably mounted in the second mounting groove; and The femoral stem includes a handle head and a handle body connected to the handle head, wherein the handle body is inclined relative to the handle head, the handle head is installed in the second installation groove, and a limiting protrusion is provided at the connection between the handle body and the handle head, and the limiting protrusion is located on the inner side of the angle between the handle body and the handle head.
2. The hip replacement system for small and medium-sized animals as claimed in claim 1, characterized in that: The angle between the limiting protrusion and the handle body is an acute angle.
3. The hip replacement system for small and medium-sized animals as claimed in claim 1, characterized in that: A groove is provided on the surface of the handle body.
4. The hip replacement system for small and medium-sized animals as claimed in claim 3, characterized in that: The groove is in the shape of a long strip extending along the length direction of the handle body.
5. The hip replacement system for small and medium-sized animals as claimed in claim 1, characterized in that: The acetabular cup, the ball head assembly and the femoral stem are all made of TC4 ELI material.
6. The hip replacement system for small and medium-sized animals as claimed in claim 1, characterized in that: The surface layer of the handle body close to the handle head is set as a diamond structure.
7. The hip replacement system for small and medium-sized animals as claimed in claim 1, characterized in that: The ball head assembly includes a femoral ball head and a connecting piece, wherein the femoral ball head is connected to the connecting piece, the femoral ball head is rotatably mounted in the first mounting groove, the connecting piece is provided with the second mounting groove, and the connecting piece is rotatably matched with the handle head.
8. The hip replacement system for small and medium-sized animals as claimed in claim 7, characterized in that: The femoral ball head is detachably connected to the connecting piece.
9. The hip replacement system for small and medium-sized animals as claimed in claim 1, characterized in that: The handle head, the handle body and the limiting protrusion are integrally formed.
10. The hip replacement system for small and medium-sized animals as claimed in claim 1, characterized in that: The handle body is arranged to be tapered in a direction away from the handle head.