Novel anti-loosening hip joint prosthesis

Abstract

The utility model discloses a novel anti-loosening hip joint prosthesis which comprises a femoral stem, a femoral head is installed at the top end of the femoral stem, an acetabulum shell is installed at the top end of the femoral head, the femoral stem comprises a femoral skeleton and a connecting assembly, the connecting assembly is installed in the femoral skeleton, and a first connecting shell is installed at the top end of the connecting assembly. A plurality of length strips are fixedly installed at the bottom end of the femoral head, a sliding block is fixedly installed on one side of each length strip, a plurality of sliding grooves are formed in the first connecting shell, and the sliding blocks are connected with the sliding grooves in a sliding mode respectively. By arranging the length strip, the sliding block and the sliding groove formed in the first connecting shell, the connecting area of the femoral head and the first connecting shell is increased, the connecting stability of the femoral head and the first connecting shell is improved, the phenomenon that the hip joint prosthesis gets loose is avoided, and the service life of the hip joint is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of hip joint prosthesis technology, specifically a novel hip joint prosthesis that prevents loosening. Background Technology

[0002] Hip prostheses are artificial joints used to replace the human hip joint, usually for the treatment of hip joint diseases or injuries. A hip prosthesis consists of two parts: an artificial femoral head and an artificial acetabular cup. They can replace the femoral head and acetabulum of the human body respectively, thereby restoring the function of the hip joint. During surgery, doctors will choose different types of hip prostheses according to the patient's specific condition, such as metal-on-polyethylene, metal-on-metal, ceramic-on-polyethylene, etc. These prostheses can provide higher stability and better athletic performance, while also reducing wear and tear and the pain caused by wear.

[0003] However, traditional hip prostheses have the following drawbacks:

[0004] With prolonged use, traditional hip prostheses are prone to loosening between the femoral stem and femoral head, affecting their normal use. Utility Model Content

[0005] The purpose of this invention is to provide a novel anti-loosening hip joint prosthesis to solve the problem mentioned in the background art that, with the passage of time, the femoral stem and femoral head of traditional hip joint prostheses are prone to loosening, affecting the normal use of the hip joint prosthesis.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a novel anti-loosening hip joint prosthesis, comprising a femoral stem, a femoral head mounted at the top of the femoral stem, an acetabular shell mounted at the top of the femoral head, the femoral stem comprising a femoral skeleton and a connecting assembly, the connecting assembly being installed inside the femoral skeleton, a first connecting shell being installed at the top of the connecting assembly, a plurality of length strips being fixedly installed at the bottom of the femoral head, a sliding block being fixedly installed on one side of each of the length strips, a plurality of sliding grooves being formed inside the first connecting shell, the plurality of sliding blocks being slidably connected to the plurality of sliding grooves respectively, the connecting assembly comprising a second connecting shell and a connecting platform, a displacement platform being slidably connected inside the second connecting shell, a length rod being fixedly installed at the bottom of the displacement platform, the bottom of the length rod being fixedly connected to the top of the connecting platform, the femoral head sliding relative to the sliding grooves via the sliding blocks installed on the length strips, thereby increasing the connection area between the two.

[0007] Preferably, the length rod has a movable groove in the middle, and a movable rod is slidably connected inside the movable groove. Directional rods are installed on both sides of the movable rod, and movable blocks are installed at one end of each of the two directional rods that are opposite to each other. A spring damper is fixedly installed at the top of the displacement platform, and the top of the spring damper is fixedly connected to the top of the inner wall of the second connecting shell. When subjected to an external impact, the movable rod slides along the movable groove, and the movable block drives the directional rods to move synchronously. The directional rods pull the movable block, causing the movable block to slide relative to the femoral frame. The length rod also drives the connecting platform to slide relative to the second connecting shell. The length rod slides relative to the second connecting shell, and the length rod, through the displacement platform, squeezes the spring damper from the bottom, thus buffering the squeezing force.

[0008] Preferably, the top end of the second connecting shell is fixedly connected to the bottom end of the first connecting shell, the connecting platform and the two movable blocks are both connected to the femoral skeleton, the connecting assembly is installed on the first connecting shell through the second connecting shell, and the connecting assembly is installed on the femoral skeleton through the connecting platform and the movable blocks.

[0009] Preferably, the surface of the femoral frame is provided with a plurality of positioning holes, and the user screws through the positioning holes to install the femoral frame at the place of use.

[0010] Preferably, a number of symmetrically arranged reinforcing strips are fixedly installed on both sides of the stock frame, and the installation of the reinforcing strips improves the compressive strength of the stock frame itself.

[0011] Preferably, an inner liner is fitted at the connection between the femoral head and the acetabular shell.

[0012] Preferably, the inner liner comprises a polyethylene layer, a glass fiber layer, and a rubber layer. The bottom end of the polyethylene layer is fixedly connected to the top end of the glass fiber layer, the bottom end of the glass fiber layer is fixedly connected to the top end of the rubber layer, the bottom end of the rubber layer is connected to the femoral head, and the top end of the polyethylene layer is connected to the acetabular shell.

[0013] Compared with the prior art, the beneficial effects of this utility model are: by setting the length bar, the sliding block and the sliding groove opened on the first connecting shell, the connection area between the femoral head and the first connecting shell is increased, the stability of the connection between the two is improved, the phenomenon of hip joint prosthesis loosening is avoided, and the service life of the hip joint is extended. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present utility model;

[0015] Figure 2 This is a diagram showing the connection between the femoral head and the femoral stem of this utility model;

[0016] Figure 3This is a cross-sectional view of the connecting component of this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the inner liner of this utility model.

[0018] In the figure: 1. Femoral stem; 101. First connecting shell; 102. Sliding groove; 103. Connecting assembly; 1031. Second connecting shell; 1032. Spring shock absorber; 1033. Displacement stage; 1034. Length rod; 1035. Movable groove; 1036. Movable rod; 1037. Movable block; 1038. Connecting platform; 1039. Direction rod; 104. Femoral skeleton; 2. Femoral head; 3. Inner liner; 31. Polyethylene thin layer; 32. Glass fiber thin layer; 33. Rubber thin layer; 4. Acetabular shell; 5. Positioning hole; 6. Reinforcing strip; 7. Length strip; 8. Sliding block. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0020] Please see Figure 1-4 This utility model provides a novel anti-loosening hip joint prosthesis, including a femoral stem 1, a femoral head 2 installed at the top of the femoral stem 1, and an acetabular shell 4 installed at the top of the femoral head 2. The femoral stem 1 includes a femoral frame 104 and a connecting assembly 103. The connecting assembly 103 is installed inside the femoral frame 104, and a first connecting shell 101 is installed at the top of the connecting assembly 103. Several length strips 7 are fixedly installed at the bottom of the femoral head 2, and sliding blocks 8 are fixedly installed on one side of each of the length strips 7. The first connecting shell 101 is internally open. The system has several sliding grooves 102 and several sliding blocks 8 that are slidably connected to the sliding grooves 102 respectively. The connecting assembly 103 includes a second connecting shell 1031 and a connecting platform 1038. A displacement platform 1033 is slidably connected inside the second connecting shell 1031. A length rod 1034 is fixedly installed at the bottom end of the displacement platform 1033. The bottom end of the length rod 1034 is fixedly connected to the top end of the connecting platform 1038. The femoral head 2 slides relative to the sliding grooves 102 through the sliding blocks 8 installed on the length bar 7, thereby increasing the connection area between the two.

[0021] A movable groove 1035 is provided in the middle of the length rod 1034. A movable rod 1036 is slidably connected inside the movable groove 1035. Directional rods 1039 are installed on both sides of the movable rod 1036. Movable blocks 1037 are installed at one end of the movable rod 1036 opposite to each other. A spring damper 1032 is fixedly installed at the top of the displacement platform 1033. The top of the spring damper 1032 is fixedly connected to the top of the inner wall of the second connecting shell 1031. When subjected to external impact, the movable rod 1036 moves along... The movable groove 1035 slides, and the movable block 1037 drives the direction rod 1039 to move synchronously. The direction rod 1039 pulls the movable block 1037, and the movable block 1037 slides relative to the frame 104. The length rod 1034 drives the connecting platform 1038 to slide relative to the second connecting shell 1031. The length rod 1034 slides relative to the second connecting shell 1031, and the length rod 1034 squeezes the spring damper 1032 from the bottom through the displacement platform 1033. The spring damper 1032 buffers the squeezing force.

[0022] The top end of the second connecting shell 1031 is fixedly connected to the bottom end of the first connecting shell 101. The connecting platform 1038 and the two movable blocks 1037 are both connected to the femoral frame 104. The connecting component 103 is installed on the first connecting shell 101 through the second connecting shell 1031, and the connecting component 103 is installed on the femoral frame 104 through the connecting platform 1038 and the movable blocks 1037.

[0023] The surface of the femoral frame 104 has several positioning holes 5. The user can screw the screws through the positioning holes 5 to install the femoral frame 104 at the place of use.

[0024] Several symmetrically arranged reinforcing strips 6 are fixedly installed on both sides of the rib frame 104. The installation of the reinforcing strips 6 improves the compressive strength of the rib frame 104 itself.

[0025] An inner liner 3 is fitted at the connection between the femoral head 2 and the acetabular shell 4.

[0026] The inner liner 3 includes a polyethylene thin layer 31, a glass fiber thin layer 32, and a rubber thin layer 33. The bottom end of the polyethylene thin layer 31 is fixedly connected to the top end of the glass fiber thin layer 32, the bottom end of the glass fiber thin layer 32 is fixedly connected to the top end of the rubber thin layer 33, the bottom end of the rubber thin layer 33 is connected to the femoral head 2, and the top end of the polyethylene thin layer 31 is connected to the acetabular shell 4.

[0027] In this embodiment, during use: the user screws the screw through the positioning hole 5 to install the femoral frame 104 at the point of use. When subjected to external impact, the movable rod 1036 slides along the movable groove 1035, and the movable block 1037 drives the direction rod 1039 to move synchronously. The direction rod 1039 pulls the movable block 1037, and the movable block 1037 slides relative to the femoral frame 104. The length rod 1034 drives the connecting platform 1038 to slide relative to the second connecting shell 1031. The length rod 1034 slides relative to the second connecting shell 1031, and the length rod 1034 squeezes the spring damper 1032 from the bottom through the displacement platform 1033. The spring damper 1032 buffers the squeezing force. The femoral head 2 slides relative to the sliding groove 102 through the sliding block 8 installed on the length bar 7, increasing the connection area between the two.

[0028] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A new type of hip joint prosthesis against loosening, comprising a femoral stem (1), characterized in that: The top end of the femoral stem (1) is provided with a femoral head (2), the top end of the femoral head (2) is provided with an acetabular shell (4), the femoral stem (1) comprises a femoral frame (104) and a connecting assembly (103), the inside of the femoral frame (104) is provided with the connecting assembly (103), the top end of the connecting assembly (103) is provided with a first connecting shell (101), the bottom end of the femoral head (2) is fixedly provided with a plurality of length strips (7), one side of the plurality of length strips (7) is fixedly provided with a sliding block (8), the inside of the first connecting shell (101) is provided with a plurality of sliding grooves (102), and the plurality of sliding blocks (8) are in sliding connection with the plurality of sliding grooves (102) respectively, the connecting assembly (103) comprises a second connecting shell (1031) and a connecting table (1038), the inside of the second connecting shell (1031) is in sliding connection with a displacement table (1033), and the bottom end of the displacement table (1033) is fixedly provided with a length rod (1034); the top end of the connecting table (1038) is fixedly connected with the bottom end of the length rod (1034).

2. A new type of hip joint prosthesis against loosening according to claim 1, characterized in that: The middle part of the length rod (1034) is provided with a movable slot (1035), the inside of the movable slot (1035) is in sliding connection with a movable rod (1036), the two sides of the movable rod (1036) are both provided with a direction rod (1039), and the direction rods (1039) are provided with movable blocks (1037) at the ends away from each other; the top end of the displacement table (1033) is fixedly provided with a spring shock absorber (1032), and the top end of the spring shock absorber (1032) is fixedly connected with the top end of the inner wall of the second connecting shell (1031).

3. A new type of hip joint prosthesis against loosening according to claim 2, characterized in that: The top end of the second connecting shell (1031) is fixedly connected with the bottom end of the first connecting shell (101), and the connecting table (1038) and the two movable blocks (1037) are connected with the femoral frame (104).

4. The new type of hip joint prosthesis that prevents loosening according to claim 1, characterized in that: The surface of the femoral frame (104) is provided with a plurality of positioning holes (5).

5. The new type of hip joint prosthesis that prevents loosening according to claim 1, characterized in that: The two sides of the femoral frame (104) are both fixedly provided with a plurality of reinforcing strips (6) arranged symmetrically.

6. A new type of hip joint prosthesis against loosening as claimed in claim 1, wherein: The connecting part of the femoral head (2) and the acetabular shell (4) is provided with an inner sleeve (3).

7. A new type of hip joint prosthesis against loosening according to claim 6, characterized in that: The inner sleeve (3) comprises a polyethylene thin layer (31), a glass fiber thin layer (32) and a rubber thin layer (33), the bottom end of the polyethylene thin layer (31) is fixedly connected with the top end of the glass fiber thin layer (32), the bottom end of the glass fiber thin layer (32) is fixedly connected with the top end of the rubber thin layer (33), the bottom end of the rubber thin layer (33) is connected with the femoral head (2), and the top end of the polyethylene thin layer (31) is connected with the acetabular shell (4).

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