Bone cement fixed type double-acting acetabular prosthesis

Abstract

The utility model relates to the technical field of medical instruments, in particular to a bone cement fixing type double-acting acetabular prosthesis which comprises a bone cement fixing type double-acting acetabular cup and a double-acting lining, and the bone cement fixing type double-acting acetabular cup comprises a bone cement fixing type double-acting acetabular cup body, an inner surface coating, an outer surface coating and a bone cement layer. Grooves are formed in the outer surface of the bone cement fixing type double-acting acetabular cup body, the inner surface coating is a polished surface coated on the inner surface of the bone cement fixing type double-acting acetabular cup body, and the bone cement layer is coated on the outer surface coating. The double-acting lining is placed in the bone cement fixing type double-acting acetabular cup body, and the outer surface of the double-acting lining is matched with a coating on the inner surface of the bone cement fixing type double-acting acetabular cup. The medical instrument prosthesis provided by the utility model is large in motion range, low in dislocation risk, and strong in temporary stability and long-term stability after being implanted.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a bone cement fixed double-motion acetabular prosthesis. Background Art

[0002] With the development of economy, people's living standard and life expectancy are improving, and the aging of population is deepening. With the increase of age, the incidence of femoral head necrosis, rheumatoid arthritis and degenerative hip osteoarthritis is increasing, and artificial hip replacement surgery is one of the important surgical techniques for treating such diseases. In addition, diseases such as congenital hip dysplasia can also be effectively treated with artificial hip replacement surgery.

[0003] Artificial hip replacement surgery requires the use of an artificial hip prosthesis. At present, the hip prosthesis commonly used in clinical practice consists of three parts: an outer cup, a dual-motion liner, and a femoral head. The outer cup and the dual-motion liner are firmly fixed by bone cement bonding or structural locking, and the dual-motion liner and the femoral head have a smooth interface to achieve low-friction sliding. Hip prostheses with this structure have a small range of motion, greater wear on the friction interface, a higher risk of dislocation, and poor long-term stability. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a bone cement fixed double-motion acetabular prosthesis, which has low friction interface wear, large range of motion, low risk of dislocation, and relatively strong temporary stability and long-term stability.

[0005] The utility model is implemented through the following scheme:

[0006] A bone cement fixed dual-motion acetabular prosthesis comprises a bone cement fixed dual-motion acetabular cup and a dual-motion liner, wherein the bone cement fixed dual-motion acetabular cup comprises a bone cement fixed dual-motion acetabular cup body, an inner surface coating, an outer surface coating and a bone cement layer, wherein the bone cement fixed dual-motion acetabular cup body is a hemispherical shell structure and the outer surface of the hemispherical shell is provided with grooves, the inner surface coating is a polished surface coated on the inner surface of the bone cement fixed dual-motion acetabular cup body, the outer surface coating is coated on the outer surface of the bone cement fixed dual-motion acetabular cup body, the bone cement layer is coated on the outer surface coating, the dual-motion liner is placed in the bone cement fixed dual-motion acetabular cup body and the outer surface of the dual-motion liner matches the inner surface coating of the bone cement fixed dual-motion acetabular cup.

[0007] Furthermore, the grooves include longitude grooves arranged along the longitude of the outer surface of the bone cement fixed dual-motion acetabular cup body and latitude grooves arranged along the latitude of the outer surface of the bone cement fixed dual-motion acetabular cup body.

[0008] Optimally, the groove is a smooth arc-shaped groove.

[0009] Optimally, the material of the bone cement-fixed dual-motion acetabular cup body is zirconium-niobium alloy.

[0010] Optimally, the inner surface coating and the outer surface coating are both oxide layers.

[0011] Optimally, the double-action lining material is organic polymer.

[0012] Beneficial effects of the utility model:

[0013] The utility model provides a bone cement fixed dual-motion acetabular prosthesis, in which a dual-motion liner and an inner surface coating of the bone cement fixed dual-motion acetabular cup are not fixed, both are smooth surfaces, and the two are matched, and the femoral head is installed in the dual-motion liner, so that the entire bone cement fixed dual-motion acetabular prosthesis can form two sliding friction interfaces, namely, the sliding friction interface between the dual-motion liner and the inner surface coating of the bone cement fixed dual-motion acetabular cup and the sliding friction interface between the dual-motion liner and the femoral head, which is equivalent to adding a femoral head with a larger diameter to the bone cement fixed dual-motion acetabular prosthesis. Therefore, the bone cement fixed dual-motion acetabular prosthesis has the advantages of lower friction interface wear, greater prosthesis mobility, lower dislocation risk, and wider indications; and because the outer surface of the bone cement fixed dual-motion acetabular cup is provided with grooves, the contact area of ​​the bone cement is increased, the bone cement can have a larger bonding range, and the temporary stability and long-term stability of the prosthesis after implantation are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic diagram of the structure of a bone cement fixed double-motion acetabular cup when viewed from above.

[0015] Figure 2 The utility model is a schematic diagram of the top view of the bone cement fixed double-motion acetabular cup.

[0016] Figure 3 It is a schematic diagram of the double-action liner structure of the utility model.

[0017] In the figure: 1. Bone cement fixed dual-motion acetabular cup body; 2. Inner surface coating; 3. Longitude groove; 4. Latitude groove; 5. Bone cement layer; 6. Dual-motion liner. DETAILED DESCRIPTION

[0018] A bone cement fixed dual-motion acetabular prosthesis comprises a bone cement fixed dual-motion acetabular cup and a dual-motion liner 6, wherein the bone cement fixed dual-motion acetabular cup comprises a bone cement fixed dual-motion acetabular cup body 1, an inner surface coating 2, an outer surface coating (not shown) and a bone cement layer 5, wherein the bone cement fixed dual-motion acetabular cup body is a hemispherical shell structure and the outer surface of the hemispherical shell is provided with grooves, the inner surface coating is a polished surface coated on the inner surface of the bone cement fixed dual-motion acetabular cup body, the outer surface coating is coated on the outer surface of the bone cement fixed dual-motion acetabular cup body, the bone cement layer is coated on the outer surface coating, the dual-motion liner is placed in the bone cement fixed dual-motion acetabular cup body and the outer surface of the dual-motion liner matches the inner surface coating of the bone cement fixed dual-motion acetabular cup.

[0019] The specific schematic diagram of the bone cement fixed dual-motion acetabular cup structure is as follows Figure 1 , Figure 2 As shown, the schematic diagram of the double-acting liner structure is as follows Figure 3 shown.

[0020] Since the bone cement fixed dual-motion acetabular cup includes a bone cement fixed dual-motion acetabular cup body, an inner surface coating, an outer surface coating and a bone cement layer, the inner surface coating is a polished surface coated on the inner surface of the bone cement fixed dual-motion acetabular cup body, the dual-motion liner is placed in the bone cement fixed dual-motion acetabular cup body and the outer surface of the dual-motion liner is consistent with the inner surface coating of the bone cement fixed dual-motion acetabular cup, the femoral head is installed in the dual-motion liner, and the dual-motion liner and the inner surface coating of the bone cement fixed dual-motion acetabular cup are not fixed, the entire bone cement fixed dual-motion acetabular prosthesis can form two sliding friction interfaces, namely, the sliding friction interface between the dual-motion liner and the inner surface coating of the bone cement fixed dual-motion acetabular cup and the sliding friction interface between the dual-motion liner and the femoral head, which is equivalent to adding a larger diameter femoral head to the bone cement fixed dual-motion acetabular prosthesis, so that the bone cement fixed dual-motion acetabular prosthesis has the advantages of lower friction interface wear, greater prosthesis mobility, lower dislocation risk, and wider indications.

[0021] Furthermore, since the main body of the bone cement-fixed dual-motion acetabular cup is a hemispherical shell structure and the outer surface of the hemispherical shell is provided with grooves, the contact area of ​​the bone cement is increased, the bone cement can have a larger bonding range, and the temporary stability and long-term stability of the prosthesis after implantation are improved.

[0022] Furthermore, the groove includes a longitude groove 3 set along the longitude of the outer surface of the bone cement fixed dual-motion acetabular cup body and a latitude groove 4 set along the latitude of the outer surface of the bone cement fixed dual-motion acetabular cup body, which further improves the uniformity of the groove, increases the contact area of ​​bone cement, and improves the temporary stability and long-term stability of the prosthesis after implantation.

[0023] Optimally, the groove is a smooth arc-shaped groove, which further increases the contact area of ​​bone cement and reduces stress concentration, thereby improving the temporary stability and long-term stability of the prosthesis after implantation.

[0024] Optimally, the bone cement-fixed dual-motion acetabular cup body is made of zirconium-niobium alloy, which has excellent corrosion resistance, mechanical properties and good biocompatibility.

[0025] Optimized, the inner surface coating and the outer surface coating are both oxide layers, the oxide layers have excellent wear resistance and low wear rate, can reduce the wear on softer parts such as linings made of organic polymer materials, that is, it has excellent wear resistance at the joint surface interface; and the oxide layer can reduce the release of metal ions and has excellent biocompatibility, that is, it has excellent biocompatibility at the bone integration interface; compared with ceramic materials, it has higher toughness, is not easy to break, and has strong impact resistance.

[0026] Optimized, the double-action liner is made of organic polymer, and can be made of polymer materials such as vitamin E cross-linked ultra-high molecular weight polyethylene, high cross-linked ultra-high molecular weight polyethylene, etc. The inner and outer surfaces of the double-action liner are both highly smooth surfaces with extremely low friction coefficient and excellent wear resistance, which can effectively reduce the wear of the friction interface and improve the survival rate of the prosthesis.

[0027] In summary, the bone cement fixed dual-motion acetabular prosthesis proposed in the utility model can form two sliding friction interfaces, so that the bone cement fixed dual-motion acetabular prosthesis has the advantages of lower friction interface wear, greater prosthesis mobility, lower dislocation risk, and wider indications. It also increases the contact area of ​​bone cement, which can give bone cement a larger bonding range, thereby improving the temporary stability and long-term stability of the prosthesis after implantation.

[0028] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A bone cement fixed dual-motion acetabular prosthesis, characterized in that: It comprises a bone cement fixed dual-motion acetabular cup and a dual-motion liner, wherein the bone cement fixed dual-motion acetabular cup comprises a bone cement fixed dual-motion acetabular cup body, an inner surface coating, an outer surface coating and a bone cement layer, the bone cement fixed dual-motion acetabular cup body is a hemispherical shell structure and the outer surface of the hemispherical shell is provided with grooves, the inner surface coating is a polished surface coated on the inner surface of the bone cement fixed dual-motion acetabular cup body, the outer surface coating is coated on the outer surface of the bone cement fixed dual-motion acetabular cup body, the bone cement layer is coated on the outer surface coating, the dual-motion liner is placed in the bone cement fixed dual-motion acetabular cup body and the outer surface of the dual-motion liner is consistent with the inner surface coating of the bone cement fixed dual-motion acetabular cup.

2. The bone cement fixed dual-mobility acetabular prosthesis according to claim 1, characterized in that: The grooves include longitude grooves arranged along the longitude of the outer surface of the bone cement fixed dual-motion acetabular cup body and latitude grooves arranged along the latitude of the outer surface of the bone cement fixed dual-motion acetabular cup body.

3. The bone cement fixed dual-mobility acetabular prosthesis according to claim 1, characterized in that: The groove is a smooth arc-shaped groove.

4. The bone cement fixed dual-mobility acetabular prosthesis according to claim 1, characterized in that: The material of the bone cement fixed dual-motion acetabular cup body is zirconium-niobium alloy.

5. The bone cement fixed dual-mobility acetabular prosthesis according to claim 1, characterized in that: The inner surface coating and the outer surface coating are both oxide layers.

6. The bone cement fixed dual-mobility acetabular prosthesis according to claim 1, characterized in that: The double-action lining material is organic polymer.

Images