CN216257656U - Acetabular prosthesis and hip resurfacing system - Google Patents

Acetabular prosthesis and hip resurfacing system Download PDF

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CN216257656U
CN216257656U CN202121310741.1U CN202121310741U CN216257656U CN 216257656 U CN216257656 U CN 216257656U CN 202121310741 U CN202121310741 U CN 202121310741U CN 216257656 U CN216257656 U CN 216257656U
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porous
molecular weight
weight polyethylene
layer
prosthesis
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陈夕辉
贺达
韩伟
徐寒冬
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Wuhan United Imaging Zhirong Medical Technology Co Ltd
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Wuhan United Imaging Zhirong Medical Technology Co Ltd
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Abstract

The utility model relates to an acetabular prosthesis and a hip joint surface replacement system. The acetabular prosthesis comprises a porous substrate and an ultrahigh molecular weight polyethylene substrate connected to the porous substrate, wherein the porous substrate is hemispherical; the ultrahigh molecular weight polyethylene substrate is fixed in a space surrounded by the porous substrate through die casting. According to the acetabulum prosthesis, the ultrahigh molecular weight polyethylene matrix is directly die-cast in the porous matrix, so that the connection strength between the ultrahigh molecular weight polyethylene matrix and the porous matrix is correspondingly improved, and the acetabulum prosthesis can meet the strength requirement of normal hip activity in a human body.

Description

Acetabular prosthesis and hip resurfacing system
Technical Field
The utility model relates to the technical field of artificial prostheses, in particular to an acetabular prosthesis and a hip joint surface replacement system.
Background
Hip resurfacing surgery can preserve more of a patient's bone mass than total hip replacement surgery, better restores patient biomechanics, and has better therapeutic effects on young patients with a high mobility need.
Most of the existing hip joint surface replacement systems in the market are matched with acetabulum prostheses and femur prostheses which are matched with each other; the prior acetabular prosthesis is generally formed by combining two materials so as to meet the biological performance of the acetabular prosthesis. However, the combination degree of the two materials of the prior acetabular prosthesis is poor, and the strength requirement of the normal hip activity of a human body cannot be met.
SUMMERY OF THE UTILITY MODEL
In view of the above, there is a need for an improved acetabular prosthesis and hip resurfacing system that addresses the above-mentioned problems.
An acetabular prosthesis comprising a porous base and an ultra high molecular weight polyethylene base connected to the porous base; the ultrahigh molecular weight polyethylene substrate is fixed in a space surrounded by the porous substrate through die casting.
Further, the porous base body includes porous outer layer and the porous inner liner layer of mutual fixation, just the porous outer layer is located the outside of porous base body, the porous inner liner layer is located the porous outer layer reaches between the ultrahigh molecular weight polyethylene base body, just the ultrahigh molecular weight polyethylene base body infiltrates and is fixed in the porous inner liner layer.
Further, the porosity of the porous outer layer is above 50%; and/or the presence of a catalyst in the reaction mixture,
the porosity of the porous lining layer is more than 20%.
Further, the porous matrix further comprises a dense layer, and the dense layer is formed between the porous outer layer and the porous lining layer.
Further, the thickness t1 of the porous outer layer satisfies the following relation: t1 is more than or equal to 0.5mm and less than or equal to 2 mm; and/or the presence of a catalyst in the reaction mixture,
the thickness t2 of the dense layer satisfies the following relation: t2 is more than or equal to 0.1mm and less than or equal to 2 mm; and/or the presence of a catalyst in the reaction mixture,
the thickness t3 of the porous lining layer satisfies the following relation: t2 is not less than 0.2mm and not more than 3 mm.
Further, the porous matrix is a titanium alloy matrix.
Further, the porous substrate is integrally formed by 3D printing.
An embodiment of the present invention also provides a hip resurfacing system comprising an acetabular component and a femoral component that cooperate with each other; the acetabular prosthesis is as claimed in any preceding claim.
Further, the femoral prosthesis comprises a spherical joint part and a connecting part which are fixed with each other, the spherical joint part is used for being matched with the ultrahigh molecular weight polyethylene body, and the connecting part is used for being implanted at a femoral bone corresponding to the acetabular prosthesis;
and the femoral prosthesis further comprises an abrasion resistant layer outside the spherical joint part.
Further, the wear resistant layer includes at least one of TiN, TiNbN, and DLC film.
An embodiment of the present invention provides an acetabular prosthesis, wherein an ultrahigh molecular weight polyethylene base is directly die-cast into a porous base, so that the connection strength between the ultrahigh molecular weight polyethylene base and the porous base is correspondingly improved, and the acetabular prosthesis can meet the strength requirement of normal hip activity in a human body.
Drawings
FIG. 1 is a schematic representation of the construction of a hip resurfacing system in accordance with one embodiment of the present invention;
FIG. 2 is a schematic view of the configuration of the acetabular prosthesis in the hip resurfacing system of FIG. 1;
FIG. 3 is a schematic structural view of the acetabular prosthesis shown in FIG. 2 at A;
FIG. 4 is a schematic partial view of an acetabular component in the hip resurfacing system according to another embodiment of the utility model;
FIG. 5 is a schematic representation of the construction of a femoral prosthesis in the hip resurfacing system of FIG. 1.
Description of the element reference numerals
100. A hip resurfacing system; 10. an acetabular prosthesis; 11. a porous matrix; 111. a porous outer layer; 112. a porous inner liner layer; 113. a dense layer; 12. an ultra-high molecular weight polyethylene matrix; 20. a femoral prosthesis; 21. a spherical joint portion; 22. a connecting portion; 23. and a wear-resistant layer.
The present invention is described in further detail with reference to the drawings and the detailed description.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model.
It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
One embodiment of the present invention provides a hip resurfacing system. The hip resurfacing system is used to replace an originally damaged acetabular joint and corresponding femoral component in a hip replacement procedure to maintain normal human mobility needs.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a hip resurfacing system 100 according to an embodiment of the present invention.
The hip resurfacing system 100 includes an acetabular prosthesis 10 and a femoral prosthesis 20. The acetabular prosthesis 10 and the femoral prosthesis 20 are configured to be installed in a human body and cooperate with each other to replace damaged portions of the human hip joint to maintain normal physiology of the human acetabular joint. The acetabulum prosthesis 10 is used for replacing a damaged part of a hip bone in a human body and is fixed with a normal hip bone part through a fastener made of special materials and the like; the femoral prosthesis 20 is secured in the femur by fasteners or the like and aligned with the acetabular prosthesis 10.
Referring to fig. 2, fig. 2 is a schematic diagram of the acetabular prosthesis 10 of the hip resurfacing system 100 shown in fig. 1.
The acetabular prosthesis 10 includes a porous matrix 11 and an ultra-high molecular weight polyethylene matrix 12 coupled to the porous matrix 11. The porous matrix 11 is intended to face and be attached to the normal side of the human hip bone. The ultra-high molecular weight polyethylene substrate 12 is fixed to the porous substrate 11, and the ultra-high molecular weight polyethylene substrate 12 is used to face the femoral prosthesis 20 in the hip resurfacing system 100, and cooperates with the femoral prosthesis 20 to replace the joint movement between the hip bone and the femur in the original human body.
The porous substrate 11 is substantially hemispherical. The outer side of the porous matrix 11 can be connected to the normal side of the hip bone; the inner wall of the space surrounded by the porous matrix 11 can be fixed with the ultra-high molecular weight polyethylene body 12. The shape of the ultrahigh molecular weight polyethylene matrix 12 is approximately the same as the shape of the inner wall of the porous matrix 11, and the enclosed space can be used for wrapping the femoral prosthesis 20, so that the femoral prosthesis 20 and the ultrahigh molecular weight polyethylene matrix 12 form normal joint connection.
It will be appreciated that in other embodiments, the outer profile of the acetabular prosthesis 10 may be configured to mate with the normal side of the hip bone in other configurations as long as a secure connection to the normal side of the hip bone is achieved.
The hip bone and the femur have larger joint activity, and are one of the joint parts with larger bearing capacity in the human body. Therefore, the force strength requirements of the acetabular prosthesis 10 or the femoral prosthesis 20 in the hip resurfacing system 100 of the present application are high, and at the same time, certain biocompatibility and good wear resistance are required.
In the present application, the acetabular prosthesis 10 is secured by the porous substrate 11 and the ultra-high molecular weight polyethylene substrate 12 such that the acetabular prosthesis 10 meets the requirements described above. The porous matrix 11 allows the porous matrix 11 and the normal side of the hip bone to be fused with each other after hip replacement surgery due to the existence of pores and to stably grow to ensure bone growth of the acetabular prosthesis 10. Due to the inherent properties of the ultra-high molecular weight polyethylene material, the ultra-high molecular weight polyethylene base 12 provides the acetabulum prosthesis 10 with ultra-high wear resistance, self-lubricity, high strength, stable chemical properties and extremely high aging resistance on the side facing the femoral prosthesis 20. These features described above all show the unique performance advantages of the ultra high molecular weight polyethylene matrix 12.
It should be explained that: the ultra-high molecular weight polyethylene matrix 12 is made of ultra-high molecular weight polyethylene material. The ultra-high molecular weight polyethylene material is a polyethylene material with a molecular weight of more than 150 ten thousand and a high crosslinking degree. Because ultra high molecular weight polyethylene (UHMW-PE) has very poor flowability in the molten state and its melt index is almost zero, it is difficult to process it by general machining methods.
Due to the above-mentioned material characteristics of the ultra-high molecular weight polyethylene, such as high surface smoothness, the bonding degree between the ultra-high molecular weight polyethylene matrix 12 and the porous matrix 11 is not high, the phase interface between the two is obvious, and it is difficult to make the ultra-high molecular weight polyethylene matrix and the porous matrix well fused even by spraying or the like. Under the condition of low combination degree, the acetabulum prosthesis is abraded on the back side under long-term use, and the joint movement of a patient is influenced in severe cases; in the case of a severely worn back side of the acetabular prosthesis, the acetabular prosthesis needs to be re-revision, which causes secondary surgical problems for the patient.
Referring to fig. 3 and 4 together, fig. 3 is a schematic structural view of the acetabular prosthesis 10 shown in fig. 2 at a point a;
fig. 4 is a partial structural view of the acetabular prosthesis 10 in the hip resurfacing system 100 according to another embodiment of the utility model.
Based on the above problem, the porous matrix 11 and the ultra-high molecular weight polyethylene matrix 12 in the present application are fixed by die casting, so that the ultra-high molecular weight polyethylene matrix 12 can be better combined with the porous matrix 11. The die casting is to rapidly form the ultra-high molecular weight polyethylene 12 in the space surrounded by the porous matrix 11 under a certain high pressure and hot melting condition, and to form a good connecting force with the porous matrix 11. The ultra-high molecular weight polyethylene rapidly extends into the porous matrix 11. The porous matrix 11 and the ultra-high molecular weight polyethylene body 12 are combined into an integrated structure through die casting, so that the problem of back side abrasion of a conventional assembled prosthesis does not exist, and the service life of the acetabular prosthesis can be correspondingly prolonged.
In the die casting process, the porous outer layer 111 and the porous inner liner layer 112 can be formed on the porous base 11 by controlling the pressure and speed of the die casting tool during the die casting process. The porous outer layer 111 is positioned on the outer side of the porous matrix 11 and is used for fixing with the normal side of the hip bone so as to enable the two to be fused with each other; the pores on the porous outer side can be used as a growth matrix of normal lateral bone cells of the hip bone. The porous lining layer 112 is positioned between the porous outer layer 111 and the ultra-high molecular weight polyethylene body 12; the porous lining layer 112 is used for infiltration and fixation of the ultra-high molecular weight polyethylene body 12. The ultra-high molecular weight polyethylene is die cast in the molten state in combination with the porous layer. When the ultrahigh molecular weight polyethylene matrix 12 penetrates the porous lining layer 112, the material of the ultrahigh molecular weight polyethylene matrix 12 penetrates into the pores of the porous lining layer 112, so that the bonding strength between the two is increased.
The mechanical properties of the acetabular prosthesis 10 formed by die casting are greatly improved. Compared with the traditional polyethylene surface coating mode, the mechanical property of the acetabular prosthesis 10 is improved because the bonding strength between the porous lining layer 112 and the ultra-high molecular weight polyethylene body 12 is better; and after combination, the fretting wear between the polyethylene and the porous matrix 11 existing in the traditional combined formula does not exist.
The porous matrix 11 and the ultrahigh molecular weight polyethylene matrix 12 are often combined by spraying, etc. and the skilled person would not think of combining them by die casting because of the small thickness of the sprayed ultrahigh molecular weight polyethylene.
In the present embodiment, the porous substrate 11 is a titanium alloy substrate. The titanium alloy has the characteristics of high mechanical strength, metal memory property and the like, so that the titanium alloy can serve as a good base body in the prosthesis, and the formed acetabulum prosthesis 10 can be well adapted to human bones.
In one embodiment, the porous substrate 11 is integrally formed by 3D printing. The 3D printing molded porous matrix 11 not only ensures the connection strength between the porous outer side and the porous lining layer 112, but also can autonomously control the respective porosities of the porous outer side and the porous lining layer 112 through the 3D printing parameter setting. So set up for porous base 11 is convenient for production and shaping, and the porosity that corresponds can independently set to comparatively ideal porosity to make ultrahigh molecular weight polyethylene base 12 can be fused in porous base 11 better through die-casting.
In one embodiment, the porous outer layer 111 has a porosity of 50% or more; and/or the porosity of the porous lining layer 112 is more than 20%. The porosity of the porous outer layer 111 is set to be more than 50%, so that a better growth space can be provided for the normal side of the hip bone; the porosity of the porous lining layer 112 is more than 20%, which can ensure that the porous lining layer 112 has sufficient pores for the ultrahigh molecular weight polyethylene matrix 12 to penetrate, so as to ensure the bonding strength between the ultrahigh molecular weight polyethylene matrix 12 and the porous matrix 11.
In one embodiment, the porous matrix 11 further includes a dense layer 113. The dense layer 113 is formed between the porous outer layer 111 and the porous lining layer 112; and the dense layer 113 is used to prevent the ultrahigh molecular weight polyethylene matrix 12 from penetrating into the porous outer layer 111, so as to ensure the porosity of the porous outer layer 111, and enable the pores of the porous lining layer 112 to be better filled with the ultrahigh molecular weight polyethylene matrix 12. Due to the existence of the porous outer layer 111 and the porous inner liner layer 112, when the ultrahigh molecular weight polyethylene matrix 12 and the porous matrix 11 are pressed together, the ultrahigh molecular weight polyethylene material is easily permeated into the porous matrix 11, so that the pores of the porous outer layer 111 are also filled with the ultrahigh molecular weight polyethylene material, thereby affecting the connection performance of the acetabular prosthesis 10 and the normal side of the hip bone. To avoid the above problems, a dense layer 113 is provided between the porous outer layer 111 and the porous inner liner layer 112. So arranged, the porous matrix 11 and the ultra-high molecular weight polyethylene matrix 12 can be better bonded. The acetabulum prosthesis 10 formed by combining the two components has great improvement on the overall mechanical property and the compatibility with the bone of the human body, and can be better adapted to the human body.
The dense layer 113 is provided to prevent the ultra-high molecular weight polyethylene substrate 12 from infiltrating into the porous outer layer 111 during die casting, and to improve the rigidity of the overall porous substrate 11. Due to the existence of the dense layer 113, the overall hardness of the porous matrix 11 is greatly improved, so that the overall rigidity of the porous matrix 11 is increased, and the corresponding overall thickness of the porous matrix 11 can be correspondingly reduced. In the application, the connection strength between the ultrahigh molecular weight polyethylene matrix 12 and the porous matrix 11 is greatly improved through the arrangement of the compact layer 113; therefore, the whole thickness of the porous matrix 11 can be correspondingly reduced, and the whole rigidity of the porous matrix 11 is obviously improved. In the field of prostheses, thinning the overall thickness of the prosthesis requires consideration of various factors, for example whether it is possible to have sufficient bonding strength with the normal side of the human bone or whether the strength of the prosthesis joint itself is sufficient, and therefore is not a problem that the skilled person can solve by simply thinning the thickness of the prosthesis.
The porous outer layer 111, the dense layer 113, and the porous lining layer 112 of the porous substrate 11 are integrally formed by 3D printing. With this arrangement, the connection strength between the respective layers of the porous substrate 11 can be ensured.
It is understood that in other embodiments, if the infiltration problem of the ultra-high molecular weight polyethylene matrix 12 is not considered, the corresponding dense layer 113 may be omitted accordingly. For example, in some other embodiments, as shown in FIG. 4, the porous matrix has an overall porous structure with a thickness of 1.2mm to 5mm and a porosity of 20% to 90%. The ultra-high molecular weight polyethylene matrix 12 achieves a fully locked fixation of the two components by penetrating into the porous inner lining layer 112 area, while the porous outer layer 111 area still has sufficient thickness for bone ingrowth.
Further, the thickness t of the porous outer layer 1111The following relational expression is satisfied: t is not less than 0.5mm1Less than or equal to 2 mm; and/or the thickness t of dense layer 1132The following relational expression is satisfied: t is not less than 0.1mm2Less than or equal to 2 mm; and/or the thickness t of the porous lining layer 1123The following relational expression is satisfied: t is not less than 0.2mm3Less than or equal to 1.5 mm. So configured, the thickness of the porous outer layer 111 is configured to allow sufficient growth space on the normal side of the hip bone to provide sufficient connection strength between the normal side of the hip bone and the acetabular prosthesis. The thickness of the porous inner liner 112 is set so as to have sufficient bonding strength with the ultra-high molecular weight polyethylene body 12 after die casting, and the thickness does not increase the burden on the patient; in addition, under the premise that the total thickness of the porous inner liner 112 and the ultra-high molecular weight polyethylene body 12 is not changed, and the bonding strength between the porous inner liner 112 and the ultra-high molecular weight polyethylene body 12 is ensured, the thickness of the ultra-high molecular weight polyethylene body 12 can be as thick as possible, so as to increase the wear resistance of the acetabular prosthesis 10 during operation. The thickness of the dense layer 113 is controlled to be t less than or equal to 0.1mm due to the limited setting of the process22mm, too thick results in an increased overall thickness of the acetabular prosthesis 10, increasing the burden on the patient.
Referring to fig. 5, fig. 5 is a schematic diagram of the femoral component 20 of the hip resurfacing system 100 of fig. 1.
The femoral prosthesis 20 comprises a spherical joint part 21 and a connecting part 22 which are fixed with each other, wherein the spherical joint part 21 is used for being matched with the ultrahigh molecular weight polyethylene body 12; the connecting portion 22 is used for implantation at the femur corresponding to the acetabular prosthesis 10. The surface of the spherical joint part 21 facing the normal side of the femur is provided with a 3D printed porous structure (not numbered). The thickness of the porous structure is between 0.5mm and 2mm, and the average porosity is more than 50 percent. The porous structure enables biotype fixation through its good bone ingrowth properties. Femoral prosthesis 20 has better long term stability than conventional bone cements.
It should be explained that: the femur corresponding to the osteotomy of the hip bone also needs to be replaced by the femoral prosthesis 20 which is matched with the acetabular prosthesis 10; the normal side of the femur refers to a position for mounting the femoral component 20 after the femoral resection and contacting the femoral component 20.
In one embodiment, to increase the wear resistance of the spherical joint 21 and the ultra-high molecular weight polyethylene matrix 12 of the femoral prosthesis 20, the femoral prosthesis 20 further includes a wear layer 23. The wear layer 23 is provided on the spherical joint part 21 at a position facing away from the normal side of the femur. The wear layer 23 is used to increase the wear resistance between the spherical joint portion 21 and the ultra-high molecular weight polyethylene body 12, so as to prolong the service life of the femoral prosthesis 20.
In one embodiment, the wear resistant layer 23 comprises at least one of TiN, TiNbN, and dlc (diamond Like carbon) films. The TiN, TiNbN, and DLC film materials are effective in increasing the wear resistance of the spherical joint portion 21, thereby extending the useful life of the hip resurfacing system 100.
It is understood that in other embodiments, the wear-resistant layer 23 may be made of other materials with good wear resistance.
An embodiment of the present invention provides an acetabular prosthesis, in which a porous matrix and an ultra-high molecular weight polyethylene matrix are combined by die casting, so as to avoid the problem of wear of the porous matrix and the ultra-high molecular weight polyethylene matrix due to the back side of a conventional assembled prosthesis, thereby prolonging the service life of the prosthesis.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. An acetabular prosthesis comprising a porous base and an ultra high molecular weight polyethylene base connected to the porous base; the ultrahigh molecular weight polyethylene substrate is fixed in a space surrounded by the porous substrate through die casting.
2. The acetabular prosthesis of claim 1, wherein the porous matrix includes a porous outer layer and a porous inner liner layer secured to each other, the porous outer layer being located outside of the porous matrix, the porous inner liner layer being located between the porous outer layer and the ultra-high molecular weight polyethylene matrix, and the ultra-high molecular weight polyethylene matrix being infiltrated with and secured to the porous inner liner layer.
3. The acetabular prosthesis of claim 2, wherein the porous outer layer has a porosity of greater than 50%; and/or the presence of a catalyst in the reaction mixture,
the porosity of the porous lining layer is more than 20%.
4. The acetabular prosthesis of claim 2, wherein the porous matrix further includes a densified layer formed between the porous outer layer and the porous inner liner layer.
5. The acetabular prosthesis of claim 4, wherein the porous outer layer has a thickness t1 that satisfies the relationship: t1 is more than or equal to 0.5mm and less than or equal to 2 mm; and/or the presence of a catalyst in the reaction mixture,
the thickness t2 of the dense layer satisfies the following relation: t2 is more than or equal to 0.1mm and less than or equal to 2 mm; and/or the presence of a catalyst in the reaction mixture,
the thickness t3 of the porous lining layer satisfies the following relation: t2 is not less than 0.2mm and not more than 3 mm.
6. The acetabular prosthesis of claim 1, wherein the porous substrate is a titanium alloy substrate.
7. The acetabular prosthesis of claim 1, wherein the porous substrate is integrally formed by 3D printing.
8. A hip resurfacing system comprising an acetabular prosthesis and a femoral prosthesis in cooperation with each other; characterised in that the acetabular prosthesis is as claimed in any one of claims 1 to 7.
9. The hip resurfacing system according to claim 8, wherein the femoral prosthesis comprises a spherical joint part and a connection part fixed to each other, the spherical joint part being adapted to cooperate with the ultra high molecular weight polyethylene base, the connection part being adapted to be implanted at a femur corresponding to the acetabular prosthesis;
and the femoral prosthesis further comprises an abrasion resistant layer outside the spherical joint part.
10. The hip resurfacing system of claim 9, wherein the wear layer comprises at least one of TiN, TiNbN, and DLC film.
CN202121310741.1U 2021-06-11 2021-06-11 Acetabular prosthesis and hip resurfacing system Active CN216257656U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116999218A (en) * 2023-09-28 2023-11-07 北京爱康宜诚医疗器材有限公司 Knee joint prosthesis and preparation method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116999218A (en) * 2023-09-28 2023-11-07 北京爱康宜诚医疗器材有限公司 Knee joint prosthesis and preparation method thereof
CN116999218B (en) * 2023-09-28 2023-12-22 北京爱康宜诚医疗器材有限公司 Knee joint prosthesis and preparation method thereof

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