Biological fixation type double-acting acetabular prosthesis

Abstract

The utility model relates to the technical field of medical instruments, in particular to a biological fixation type double-acting acetabular prosthesis which comprises a biological fixation type double-acting acetabular cup and a double-acting lining, and the biological fixation type double-acting acetabular cup comprises a biological fixation type double-acting acetabular cup body, an inner surface coating and an outer surface coating. The biological fixation type double-acting acetabular cup body is of a hemispherical shell structure, the inner surface coating is a polished surface coated on the inner surface of the biological fixation type double-acting acetabular cup body, the outer surface coating is coated on the outer surface of the biological fixation type double-acting acetabular cup body, the dome is of a plane structure, and a plurality of annular grooves are formed in the portion close to the dome. A plurality of protrusions are arranged at the position close to the bottom, the double-acting lining is placed in the biological fixation 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 biological fixation type double-acting acetabular cup. The medical instrument is low in friction interface abrasion, large in prosthesis motion range, low in dislocation risk and high in long-term stability.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a biological 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 biological fixed double-motion acetabular prosthesis, which has low friction interface wear, large range of motion, low dislocation risk and strong long-term stability.

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

[0006] A biologically fixed dual-motion acetabular prosthesis comprises a biologically fixed dual-motion acetabular cup and a dual-motion liner, wherein the biologically fixed dual-motion acetabular cup comprises a biologically fixed dual-motion acetabular cup body, an inner surface coating and an outer surface coating, wherein the biologically fixed dual-motion acetabular cup body is a hemispherical shell structure, the inner surface coating is a polished surface covering the inner surface of the biologically fixed dual-motion acetabular cup body, the outer surface coating is coated on the outer surface of the biologically fixed dual-motion acetabular cup body and the dome of the outer surface coating is a planar structure, the outer surface coating is provided with a plurality of annular grooves at a position close to the dome and a plurality of protrusions at a position close to the bottom, the dual-motion liner is placed in the biologically fixed dual-motion acetabular cup body and the outer surface of the dual-motion liner matches the inner surface coating of the biologically fixed dual-motion acetabular cup.

[0007] Furthermore, the plurality of protrusions are evenly distributed along the outer surface coating and form a plurality of annular structures, and a plurality of rows of protrusions are arranged at intervals in the plurality of annular structures and are higher than other protrusions.

[0008] Optimally, the plurality of protrusions are tooth-shaped structures opposite to the implantation direction of the biological fixation dual-mobility acetabular cup.

[0009] Optimally, the biologically fixed dual-motion acetabular cup body is made of a zirconium-niobium alloy material, the inner surface coating is an oxide layer, and the dual-motion liner is made of an organic polymer material.

[0010] Optimally, the outer surface coating is hydroxyapatite or titanium slurry or alumina inert bioceramics.

[0011] Preferably, the outer surface coating has a porous structure.

[0012] Optimally, the outer surface coating is a trabecular structure, and the pore size of the trabecular structure located in the weight-bearing area after the biological fixation dual-mobility acetabular cup is implanted is smaller than the pore size of the trabecular structure in other parts.

[0013] Furthermore, two acetabular cup nail holes are provided on the side wall of the biological fixation dual-motion acetabular cup, one of which is located at the pubic bone after the biological fixation dual-motion acetabular cup is implanted and the direction of the acetabular cup nail hole points to the pubic branch, and the other acetabular cup nail hole is located at the ischium after the biological fixation dual-motion acetabular cup is implanted and the direction points to the ischium branch, and the acetabular cup screws are installed at the acetabular cup nail holes.

[0014] Optimally, the acetabular nail hole and the acetabular screw are both conical structures, the acetabular screw includes a threaded portion and a nail cap portion, the nail cap portion is coated with an oxide layer coating, the threaded portion is coated with hydroxyapatite or titanium slurry or alumina inert bioceramic coating, and the coating of the threaded portion is a porous structure.

[0015] Furthermore, an iliac wing is fixedly provided on the top of the biological fixation type dual-motion acetabular cup, a wing hole is opened on the iliac wing, and a wing hole screw is installed at the wing hole.

[0016] Beneficial effects of the utility model:

[0017] The utility model provides a biological fixed double-motion acetabular prosthesis, in which the double-motion liner and the inner surface coating of the biological fixed double-motion acetabular cup are not fixed, both are smooth surfaces, and the two are matched, and the femoral head is installed in the double-motion liner, so that the entire biological fixed double-motion acetabular prosthesis can form two sliding friction interfaces, namely, the sliding friction interface between the double-motion liner and the inner surface coating of the biological fixed double-motion acetabular cup and the sliding friction interface between the double-motion liner and the femoral head, which is equivalent to adding a femoral head with a larger diameter to the biological fixed double-motion acetabular prosthesis. Therefore, the biological fixed double-motion acetabular prosthesis has lower friction interface wear, greater prosthesis mobility, and lower dislocation risk. The invention has the advantages of lower risk and wider indications; and because the dome of the outer surface coating of the biological fixation dual-motion acetabular cup is a flat structure, the biological fixation dual-motion acetabular cup can have a closer contact with the bony acetabular wall, and can prevent the bony acetabulum from squeezing out the biological fixation dual-motion acetabular cup after implantation; at the same time, because a plurality of annular grooves are provided at the position close to the dome and a plurality of protrusions are provided at the position close to the bottom, when the biological fixation dual-motion acetabular cup is driven into the bony acetabulum, the elastic retraction of the bone wall can be closely engaged with the grooves and protrusions, thereby preventing the biological fixation dual-motion acetabular cup from being dislocated and increasing the probability of long-term bone ingrowth, which is helpful to achieve the long-term stability of the biological fixation dual-motion acetabular prosthesis. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a bottom view structural schematic diagram of a specific embodiment 1 of the biological fixation dual-motion acetabular cup of the utility model.

[0019] Figure 2 It is a schematic diagram of the top view of the structure of a specific embodiment 1 of the biological fixation dual-motion acetabular cup of the utility model.

[0020] Figure 3 It is a schematic diagram of the main structure of a specific embodiment 1 of the biological fixation dual-motion acetabular cup of the utility model.

[0021] Figure 4 It is a bottom-up structural schematic diagram of a second specific embodiment of the biological fixation dual-motion acetabular cup of the utility model.

[0022] Figure 5 It is a schematic diagram of the top view of the structure of the second specific embodiment of the biological fixation double-motion acetabular cup of the utility model.

[0023] Figure 6 It is a schematic diagram of the double-action liner structure of the utility model.

[0024] Figure 7 The utility model is a schematic diagram of the structure of the acetabular cup screw.

[0025] Figure 8 The utility model is a schematic diagram of the assembly structure of the acetabular cup screw and the biological fixation type double-motion acetabular cup.

[0026] In the figure: 1. Biological fixation dual-motion acetabular cup body; 2. Inner surface coating; 3. Outer surface coating; 4. Protrusion; 5. Annular groove; 6. Plane structure; 7. Iliac wing; 8. Wing hole; 9. Trabecular structure; 10. Acetabular cup screw hole; 11. Dual-motion liner; 12. Acetabular cup screw; 13. Screw cap part; 14. Threaded part. DETAILED DESCRIPTION

[0027] A biologically fixed dual-motion acetabular prosthesis includes a biologically fixed dual-motion acetabular cup and a dual-motion liner 11, wherein the biologically fixed dual-motion acetabular cup includes a biologically fixed dual-motion acetabular cup body 1, an inner surface coating 2 and an outer surface coating 3, wherein the biologically fixed dual-motion acetabular cup body is a hemispherical shell structure, wherein the inner surface coating is a polished surface covering the inner surface of the biologically fixed dual-motion acetabular cup body, wherein the outer surface coating is coated on the outer surface of the biologically fixed dual-motion acetabular cup body and the dome of the outer surface coating is a plane structure 6, wherein the outer surface coating is provided with a plurality of annular grooves 5 near the dome and a plurality of protrusions 4 near the bottom, wherein the dual-motion liner is placed in the biologically fixed dual-motion acetabular cup body and the outer surface of the dual-motion liner matches the inner surface coating of the biologically fixed dual-motion acetabular cup.

[0028] In the above structure, the dual-motion liner and the inner surface coating of the biologically fixed dual-motion acetabular cup are not fixed, and both are smooth surfaces, and the two are consistent with each other. The femoral head is installed in the dual-motion liner, and the entire biologically 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 biologically 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 biologically fixed dual-motion acetabular prosthesis, so that the biologically fixed dual-motion acetabular prosthesis has the advantages of lower friction interface wear, greater prosthesis mobility, lower dislocation risk, and wider indications.

[0029] The outer surface coating dome of the biologically fixed dual-motion acetabular cup is a plane structure, which can make the biologically fixed dual-motion acetabular cup have a closer contact with the bony acetabular wall and prevent the bony acetabulum from squeezing out the acetabular cup after implantation;

[0030] The outer surface coating is provided with multiple annular grooves near the dome and multiple protrusions near the bottom, which not only increases the contact area between the biological fixed dual-motion acetabular cup and the bone, but also further increases the possibility of bone ingrowth.

[0031] Moreover, when the biologically fixed dual-motion acetabular cup is driven into the bony acetabulum, the elastic retraction of the bone wall can closely fit with the groove and protrusion, thereby preventing the biologically fixed dual-motion acetabular cup from falling out and increasing the probability of long-term bone ingrowth, which helps to achieve the long-term stability of the biologically fixed dual-motion acetabular prosthesis.

[0032] Specific embodiment 1, the schematic diagram of the structure of the biological fixed dual-motion acetabular cup is as follows Figure 1 , Figure 2 , Figure 3 As shown, the multiple protrusions are evenly distributed along the outer surface coating and form multiple annular structures. Multiple rows of protrusions are arranged in the middle of the multiple annular structures and are higher than other protrusions. The multiple rows of protrusions are higher than other protrusions and can ensure the stability of the biological fixation dual-motion acetabular cup without acetabular cup screw fixation.

[0033] Optimally, the plurality of protrusions are tooth-shaped structures opposite to the implantation direction of the biological fixation dual-motion acetabular cup, so that when the biological fixation dual-motion acetabular cup is driven into the bony acetabulum, the bone wall elastically retracts and tightly engages with the tooth-shaped structure, thereby preventing the biological fixation dual-motion acetabular cup from falling out.

[0034] Optimized, the biological fixation dual-motion acetabular cup body is made of zirconium-niobium alloy material, the inner surface coating is an oxide layer, and the dual-motion liner is made of organic polymer material; the zirconium-niobium alloy material has excellent corrosion resistance, mechanical properties and good biocompatibility, the oxide layer has excellent wear resistance and low wear rate, can reduce the wear of softer parts such as the dual-motion liner made of organic polymer material, that is, it has excellent wear resistance at the joint surface interface; and the oxide layer can reduce the release of metal ions, 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.

[0035] Optimally, the outer surface coating is hydroxyapatite or titanium slurry or alumina inert bioceramics, which has the advantage of good biocompatibility and can increase the initial and long-term stability of the biologically fixed dual-motion acetabular prosthesis.

[0036] Optimally, the outer surface coating has a porous structure, which is beneficial to the long-term stability of bone growth.

[0037] Optimally, the outer surface coating is a trabecular structure 9, and the pore size of the trabecular structure in the weight-bearing area after the biological fixation dual-motion acetabular cup is implanted is smaller than the pore size of the trabecular structure in other parts, which can make the mechanical environment of the weight-bearing area of ​​the contact surface between the biological fixation dual-motion acetabular cup and the bone good, thereby reducing the risk of bone absorption and effectively inducing bone ingrowth.

[0038] Furthermore, two acetabular cup nail holes 10 are provided on the side wall of the biological fixation dual-motion acetabular cup, one of which is located at the pubic bone after the biological fixation dual-motion acetabular cup is implanted and the direction of the acetabular cup nail hole points to the pubic branch, and the other acetabular cup nail hole is located at the ischium after the biological fixation dual-motion acetabular cup is implanted and the direction is directed to the ischium branch, and an acetabular cup screw 12 is installed at the acetabular cup nail hole. When the biological fixation dual-motion acetabular prosthesis is implanted, the acetabular cup screw is nailed into the bone, which can achieve firm fixation of the biological fixation dual-motion acetabular cup, and because one of the acetabular cup nail holes is located at the pubic bone after the biological fixation dual-motion acetabular cup is implanted and the direction of the acetabular cup nail hole points to the pubic branch, and the other acetabular cup nail hole is located at the ischium after the biological fixation dual-motion acetabular cup is implanted and the direction is directed to the ischium branch, precise guiding positioning can be formed.

[0039] Optimized, the acetabular cup nail hole and the acetabular cup screw are both conical structures, the acetabular cup screw 12 includes a threaded portion 14 and a nail cap portion 13, the nail cap portion is coated with an oxide layer coating, the threaded portion is coated with hydroxyapatite or titanium slurry or alumina inert bioceramic coating, and the coating of the threaded portion is a porous structure, the body portion of the acetabular cup screw can be a metal material with good biocompatibility such as titanium alloy, cobalt-chromium-molybdenum, stainless steel, zirconium-niobium alloy, etc., the nail cap portion is coated with an oxide layer coating, which can be completely immersed in the acetabular cup nail hole, and there is no interference with the sliding between the dual-motion liner and the biological fixed dual-motion acetabular cup, the threaded portion is coated with hydroxyapatite or titanium slurry or alumina inert bioceramic coating, when the biological fixed dual-motion acetabular prosthesis is implanted, the threaded portion is nailed into the bone, which can achieve firm fixation of the biological fixed dual-motion acetabular cup, and has good biocompatibility, which can effectively induce bone ingrowth.

[0040] Furthermore, an iliac wing 7 is fixedly provided on the top of the biological fixation type dual-motion acetabular cup, and a wing hole 8 is provided on the iliac wing, and a wing hole screw is installed at the wing hole. Multiple iliac wings can be provided, and the iliac wings can be horizontal or L-shaped, and one or more wing holes can be provided. The wing hole screw can adopt the same structure as the acetabular cup screw, and the length can be designed according to actual needs. The iliac wing cooperates with the acetabular cup screw, and can be flexibly shaped according to the actual situation of the bone during the operation, while ensuring the stability of the support, it has a better extended operation space, a larger fixation range, and more flexible operation.

[0041] Specific embodiment 2, the specific structural diagram is as follows Figure 4 , the outer surface coating of the biological fixation dual-motion acetabular cup shown is a trabecular bone structure, the acetabular cup has two nail holes, one iliac wing, and one wing hole.

[0042] Specific embodiment 3, the specific structural diagram is as follows Figure 5As shown, the outer surface coating of the biological fixation dual-mobility acetabular cup is a trabecular bone structure, the acetabular cup has two nail holes, and the iliac wing has three holes, including two horizontal iliac wings and an L-shaped iliac wing, and each iliac wing has two holes.

[0043] The schematic diagram of the double-acting liner structure is as follows Figure 6 As shown, the schematic diagram of the acetabular cup screw structure is as follows Figure 7 As shown, the schematic diagram of the assembly structure of the acetabular cup screw and the biological fixed dual-motion acetabular cup is as shown in Figure 8 shown.

[0044] In summary, the biologically fixed dual-motion acetabular prosthesis proposed in the utility model can form two sliding friction interfaces, so that the biologically fixed dual-motion acetabular prosthesis has the advantages of lower friction interface wear, greater prosthesis mobility, lower dislocation risk, and wider indications. It can also make the biologically fixed dual-motion acetabular cup have a closer contact with the bony acetabulum wall, preventing the bony acetabulum from squeezing out the biologically fixed dual-motion acetabular cup after implantation, increasing the probability of long-term bone ingrowth, and helping to achieve the long-term stability of the biologically fixed dual-motion acetabular prosthesis.

[0045] 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 biologically fixed dual-motion acetabular prosthesis, characterized in that: It comprises a biologically fixed dual-motion acetabular cup and a dual-motion liner, wherein the biologically fixed dual-motion acetabular cup comprises a biologically fixed dual-motion acetabular cup body, an inner surface coating and an outer surface coating, wherein the biologically fixed dual-motion acetabular cup body is a hemispherical shell structure, the inner surface coating is a polished surface coated on the inner surface of the biologically fixed dual-motion acetabular cup body, the outer surface coating is coated on the outer surface of the biologically fixed dual-motion acetabular cup body and the dome of the outer surface coating is a plane structure, the outer surface coating is provided with a plurality of annular grooves at a position close to the dome and a plurality of protrusions at a position close to the bottom, the dual-motion liner is placed in the biologically fixed dual-motion acetabular cup body and the outer surface of the dual-motion liner matches the inner surface coating of the biologically fixed dual-motion acetabular cup.

2. The biologically fixed dual-mobility acetabular prosthesis according to claim 1, characterized in that: The plurality of protrusions are evenly distributed along the outer surface coating and form a plurality of annular structures, wherein a plurality of rows of protrusions are arranged at intervals in the plurality of annular structures and are higher than other protrusions.

3. The biologically fixed dual-mobility acetabular prosthesis according to claim 1, characterized in that: The plurality of protrusions are tooth-shaped structures opposite to the implantation direction of the biological fixation dual-motion acetabular cup.

4. The biologically fixed dual-mobility acetabular prosthesis according to claim 1, characterized in that: The biological fixation type dual-motion acetabular cup body is made of a zirconium-niobium alloy material, the inner surface coating is an oxide layer, and the dual-motion liner is made of an organic polymer material.

5. The biologically fixed dual-mobility acetabular prosthesis according to claim 1, characterized in that: The outer surface coating is hydroxyapatite or titanium slurry or alumina inert bioceramics.

6. The biologically fixed dual-mobility acetabular prosthesis according to claim 1, characterized in that: The outer surface coating is a porous structure.

7. The biologically fixed dual-mobility acetabular prosthesis according to claim 1, characterized in that: The outer surface coating is a trabecular structure, and the pore size of the trabecular structure located in the weight-bearing area after the biological fixed dual-mobility acetabular cup is implanted is smaller than the pore size of the trabecular structure in other parts.

8. The biologically fixed dual-mobility acetabular prosthesis according to claim 1, characterized in that: Two acetabular cup nail holes are arranged on the side wall of the biological fixation dual-motion acetabular cup, one of which is located at the pubic bone after the biological fixation dual-motion acetabular cup is implanted and the direction of the acetabular cup nail hole points to the pubic branch, and the other acetabular cup nail hole is located at the ischium after the biological fixation dual-motion acetabular cup is implanted and the direction points to the ischium branch, and the acetabular cup screws are installed at the acetabular cup nail holes.

9. The biologically fixed dual-mobility acetabular prosthesis according to claim 8, characterized in that: The acetabular nail hole and the acetabular screw are both conical structures. The acetabular screw includes a threaded portion and a nail cap portion. The nail cap portion is coated with an oxide layer coating, and the threaded portion is coated with hydroxyapatite or titanium slurry or alumina inert bioceramic coating, and the coating of the threaded portion is a porous structure.

10. The biologically fixed dual-mobility acetabular prosthesis according to claim 8, characterized in that: An iliac wing is fixedly arranged on the top of the biological fixation type dual-motion acetabular cup, a wing hole is opened on the iliac wing, and a wing hole screw is installed at the wing hole.

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