Bionic acetabular prosthesis

Abstract

The utility model belongs to the technical field of joint prostheses, and particularly relates to a bionic acetabulum prosthesis which comprises a cup body integrally in a spherical crown shape, the bottom of the cup body is recessed inwards to form a cavity, the outer wall surface of the cup body is provided with a plurality of ribs integrally in an annular shape, the cross section of each rib is integrally in a trapezoid shape with a large base and a small top, notches are formed in the upper ring of each rib at intervals in the circumferential direction, and the notches are communicated with the cavity. The concave depth of the notch is smaller than or equal to the protruding height of the protruding edge. In this way, the slopes of the bevel edges on the two sides of the overall trapezoidal section of the protruding edge on the cup body are adjusted according to the cup body manufacturing material, flaws on the surface of the cavity can be avoided, and therefore the production quality of the acetabular prosthesis is guaranteed. On the basis, notches can be randomly formed in the convex edges according to requirements, so that circumferential rotation limiting of the cup body can be realized by matching with bone cement. An annular groove with a large opening is formed by the inclined faces where every two adjacent protruding edges are gently connected, more bone cement can be contained in the annular groove when the annular groove is used, and therefore the stability of the cup body in the height direction in the installation state of the cup body is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of joint prostheses, and particularly relates to a bionic acetabular prosthesis. Background Art

[0002] Total hip arthroplasty is a treatment method that uses an acetabular prosthesis and a femoral prosthesis to replace a diseased hip joint. The fixation method of the acetabular prosthesis connected to the acetabulum through the bonding action of bone cement has been widely promoted and applied because of its advantage of rapid postoperative recovery.

[0003] Chinese Patent CN209253232U (denoted as Document 1) discloses a cemented acetabular prosthesis, which includes a cup body with a hemispherical structure and an accommodation cavity inside. Transverse grooves and vertical grooves are arranged on the outer surface of the cup body, and a snap ring is clamped on the transverse grooves of the cup body. Multiple transverse grooves are arranged parallel to each other, and the vertical grooves are symmetrically arranged on the vertical plane of the cup body. One end of multiple vertical grooves finally converges on the transverse groove opened at the top of the cup body. Each vertical plane where two symmetrically arranged vertical grooves are located can divide the cup body into two parts with equal areas. After filling bone cement in the patient's acetabular fossa, the cemented acetabular prosthesis is implanted into the patient's acetabular fossa. The transverse grooves of the acetabular prosthesis can prevent the prosthesis from axially moving, and the vertical grooves can prevent the prosthesis from rotating in the acetabular fossa. The snap ring is made of metal material, and the metal ring can be visualized when taking an X-ray film, which can help doctors determine the position of the cemented acetabular prosthesis implanted in the patient's body. Another Chinese Patent CN213250057U (denoted as Document 2) discloses an acetabular cup with a visualization wire, which includes an acetabular cup body integrally formed by ultra-high molecular weight polyethylene material. The acetabular cup body includes a hemispherical body located at the lower part and a contraction part located at the upper part of the hemispherical body. The diameter of the contraction part is smaller than that of the hemispherical body to prevent the spherical joint of the femoral head from falling off. Multiple parallel annular grooves are evenly arranged on the outer side of the hemispherical body from the pole to the equator direction, and vertical grooves connecting the pole and the equator direction are provided. A visualization wire made of metal material is arranged in the annular groove with the largest diameter.

[0004] As shown in the specification drawings of Document 1 and Document 2, the outer surface of the existing hemispherical acetabular prosthesis is divided into several convex blocks by transverse grooves and vertical grooves. The size of the convex blocks is significantly larger than the notch size of the vertical grooves or transverse grooves. On the one hand, it is not convenient for bone cement to enter the groove cavity, and the stability of the installation of the acetabular prosthesis cannot be guaranteed. On the other hand, the change rate of the wall thickness of the acetabular prosthesis at the transverse grooves or vertical grooves is relatively large. To avoid shrinkage and deformation of the inner surface of the acetabular prosthesis during molding, the inner surface of the acetabular prosthesis is uneven. The acetabular prosthesis needs to adopt a larger wall thickness. In this case, with the same outer diameter of the acetabular prosthesis, the range of motion of the hip joint is smaller than that of the acetabular prosthesis with a thinner wall thickness. Summary of the Utility Model

[0005] The purpose of the present utility model is to provide a bionic acetabular prosthesis that is easy to produce and process and has good installation stability.

[0006] To achieve the above purpose, the technical solution adopted by the present utility model is: a bionic acetabular prosthesis, including a cup body with an overall spherical crown shape. The bottom of the cup body is recessed inward to form a cavity. The inner wall surface of the cavity includes a spherical crown surface that matches the outer diameter of the ball head prosthesis. The outer wall surface of the cup body is provided with a number of convex ribs that are integrally annular. The cross-section of the convex ribs is generally trapezoidal with a larger base and a smaller top. The base connection of adjacent convex ribs forms an annular groove. Concave notches are circumferentially spaced on the convex ribs, and the depth of the concave notches is less than or equal to the height of the convex ribs.

[0007] Compared with the prior art, the present utility model has the following technical effects: By adjusting the slopes of the two inclined sides of the trapezoidal cross-section of the convex ribs on the cup body according to the cup body material, the formation of spherical crown surface defects can be avoided, thus ensuring the production quality of the acetabular prosthesis. On this basis, concave notches can be arbitrarily arranged on the convex ribs according to requirements to facilitate the use of bone cement to achieve circumferential rotation limit of the cup body. The inclined surfaces where two adjacent convex ribs are gently connected form an annular groove with a larger opening, which can accommodate more bone cement during use, thereby improving the stability of the cup body in the height direction of the cup body during installation. Description of the Drawings

[0008] The following briefly describes the content expressed by each drawing in this specification and the marks in the drawings:

[0009] Figure 1 、 2 is the three-dimensional schematic diagram of Embodiment 1;

[0010] Figure 3 is the top view of Embodiment 1;

[0011] Figure 4 is Figure 3 the B-B cross-sectional view in

[0012] Figure 5 is Figure 3 the A-A cross-sectional view in

[0013] Figure 6 is the three-dimensional schematic diagram of Embodiment 2;

[0014] Figure 7 is the front view of Embodiment 2;

[0015] Figure 8 is Figure 7 the C-C cross-sectional view of

[0016] Figure 9 is the cross-sectional view of Embodiment 2 passing through the center line and avoiding the concave notches.

[0017] In the figure: 10. cup body, 11. cavity, 111. spherical crown surface, 112. conical surface, 12. ridge, 121. prism surface, 122. upper prism surface, 122a. ridge plane domain, 13. recess, 14. positioning boss, 141. table surface, 15. convex ring, 151. convex ring outer ring surface, 152. upper prism surface, 152a. convex ring plane domain, 16. annular groove, 20. developing wire. DETAILED DESCRIPTION

[0018] The specific implementation of the present utility model is further described in detail below through the description of embodiments in conjunction with the accompanying drawings.

[0019] Embodiment 1

[0020] A bionic acetabular prosthesis includes a cup body 10 which is in a spherical crown shape as a whole. The bottom of the cup body 10 is recessed inward to form a cavity 11. The inner wall surface of the cavity 11 includes a spherical crown surface 111 for relative rotational cooperation with a ball head prosthesis. To ensure stable and reliable cooperation between the two, the inner wall surface of the spherical crown surface 111 should be smooth, and its diameter should match the outer diameter of the ball head prosthesis.

[0021] In order to achieve stable installation of the acetabular prosthesis, the outer wall of the cup body 10 is provided with a plurality of integrally annular ridges 12. When in use, the bone cement enters the annular groove 16 and solidifies to prevent the cup body 10 from moving along the direction of the cup body centerline a. Figure 1 As shown, the so-called "annular" means that the ridges 12 are arranged in a closed ring on the outer wall of the cup body 10, and the convex part is continuous and uninterrupted, which can further ensure the stability and reliability of the upper limit of the cup body 10 and the bone cement in the direction of the center line a of the cup body. Figure 4 As shown, the cross section of the ridge 12 perpendicular to its ring core is in the shape of a trapezoid with a large base and a small top. The wall thickness of the cup body 10 gradually thickens from both sides of the ridge 12 to the middle, which can effectively avoid the quality defects of the inner wall surface of the cavity 11 caused by excessive wall thickness change rate. The connection between two adjacent ridges 12 is the ridge base with a smaller protruding height, and an annular groove 16 is formed under the ridge top with a larger protruding height of the ridge 12.

[0022] As attached Figure 3As shown, concave notches 13 are circumferentially spaced on the convex rib 12. During use, after the bone cement solidifies in the concave cavity of the concave notch 13, it can prevent the cup body 10 from rotating and displacing around the cup body center line a. In this embodiment, the recess depth of the concave notch 13 is less than or equal to the protrusion height of the convex rib 12, that is, the minimum distance between the concave surface of the concave notch 13 and the center of the spherical crown surface 111 is greater than the minimum distance between the protruding surface of the convex rib 12 and the center of the spherical crown surface 111. This makes the protruding parts of the convex rib 12 arranged at different heights but still remain continuous. In addition, on the premise that the convex rib 12 does not cause quality defects on the inner wall surface of the cavity 11, the concave notch 13 is arranged away from the inner wall surface of the cavity 11 and the wall thickness change of the cup body 10 at this position is less than the change amount of the convex rib 12, so it will not cause quality defects on the inner wall surface of the cavity 11 either. That is to say, at the product design stage, after adjusting the shape profile of the convex rib 12 according to the selected material to meet the requirements of the surface quality of the spherical crown surface 111, there is a greater degree of freedom in the arrangement of the concave notch 13.

[0023] Define the maximum concave value of the concave surface of the concave notch 13 in the radial direction of the cup body 10 as the depth, and the maximum distance between the two ends of the concave surface of the concave notch 13 in the circumferential direction of the cup body 10 as the width. The greater the recess depth and width of the concave notch 13, the better the effect of restricting the rotation of the cup body 10 in cooperation with the bone cement, and the more convenient the adjustment of the cooperation posture with the acetabular fossa hole. However, if the depth or width of the concave notch 13 located at the lower part of the cup body 10 is too large, it is easy for the bone cement to leak out from the cup mouth of the cup body 10. The core diameter of the convex rib 12 located at the upper part of the cup body 10 is small, and if the depth or width of the concave notch 13 provided thereon is too large, the effective length of the rib body will be small, thus unable to ensure the axial anti-disconnection effect. Therefore, as shown in the appendix Figure 5 As shown, in this embodiment, the recess depth of the concave notch 13 arranged in the middle position in the height direction of the cup body 10 is greater than the recess depth of the concave notch 13 located above or below it, that is, h2 > h1 and h2 > h3 in the figure. At the same time, in this embodiment, the recess width of the concave notch 13 arranged in the middle position in the height direction of the cup body 10 is also greater than the recess width of the concave notch 13 located above or below it. In other embodiments, the concave notch 12 can also be set to have only the recess depth or the recess width being large in the middle and small in the upper and lower parts according to requirements.

[0024] Furthermore, the concave surfaces of the concave notches 13 arranged at different heights on the same side of the cup body 10 can be located in the same cylindrical surface, so that the positioning of the machining tool or die is more convenient. On this basis, to ensure that the recess depth of the concave notch 13 is less than the protrusion height of the convex rib 12, as shown in the appendix Figure 5 As shown, the concave notch 13 is symmetrically arranged relative to the cup body center line a. The center lines c and d of the concave surfaces of the concave notches 13 arranged on both sides of the cup body center line a intersect at point P, and point P is located above the cup body 10. In this way, only by determining the positional relationship between the center lines c and d of the concave surfaces and the cup body center line a, the recess depth of the concave notch 13 can be determined. In this embodiment, as shown in the appendix Figure 3As shown, four groups of concave notches 13 arranged at different heights are circumferentially and equiangularly spaced around the cup body 10, and the center lines of the inner concave surfaces of the concave notches 13 intersect at one point, facilitating the positioning of the cutting tools or dies for processing the concave notches 13.

[0025] The convex rib 12 is as shown in the appendix Figure 4 As shown, it includes a rib table surface 121 arranged away from the cavity 11. The rib table surface 121 constitutes the raised top surface of the convex rib 12. The rib table surfaces 121 of the convex ribs 12 on the cup body 10 are located within the same spherical surface. A positioning boss 14 protruding upward is provided at the top of the cup body 10. The table surface 141 of the positioning boss 14 and the rib table surface 121 of the convex rib 12 are located within the same spherical surface. The positioning boss 14 is in the shape of a mushroom with a smaller bottom and a larger top, and its inwardly recessed base also forms an annular groove 16. A convex ring 15 is provided on the outer periphery of the bottom of the cup body 10. The upper ring surface 151a of the outer ring surface 151 of the convex ring 15 is located on the same spherical surface as the rib table surface 121. The bottom of the upper ring surface 151a extends downward along the tangential direction of the spherical surface where it is located to form a cylindrical lower ring surface 151b. The center of curvature O of the spherical surface where the upper ring surface 151a is located intersects the core line of the lower ring surface 151b.

[0026] As shown in the appendix Figure 4 As shown, most of the outer surface of the cup body 10 except the cup mouth end is within the same spherical surface, facilitating the adjustment of the installation posture of the cup body 10. Among them, the positioning boss 14 can ensure the accuracy of the installation and positioning of the cup body 10 in the direction of the cup body center line a, that is, ensure the accuracy of the installation depth direction positioning of the cup body 10 in the acetabular fossa.

[0027] The upper side rib surface 122 of the convex rib 12 includes a convex rib planar region 122a in the shape of an annular plane, and the surfaces where the convex rib planar regions 122a are located are parallel. This facilitates the withdrawal of the cutting tools or dies along the direction parallel to the convex rib planar region 122a during production and processing. In this embodiment, the plane where the core of the convex rib 12 is located is perpendicular to the cup body center line a, and the plane where the convex rib planar region 122a is located is also perpendicular to the cup body center line a. Similarly, for the convenience of production and processing, as shown in the appendix Figure 2 、 4 As shown, the plane where the core of the convex ring 15 is located is perpendicular to the cup body center line a. The upper side ring surface 152 of the convex ring 15 includes a convex ring planar region 152a in the shape of an annular plane, and the convex ring planar region 152a is also perpendicular to the cup body center line a. The cup mouth end face of the cup body 10 is also a plane perpendicular to the cup body central axis a. In this way, the cutting tools or dies for producing the cup body 10 can be separated along the direction perpendicular to the cup body center line a.

[0028] To ensure the appearance quality of the cup body 10, in this embodiment, the angle between the outer edge of the convex rib flat region 122a and the rib table surface 121 is an obtuse angle, which is not likely to cause appearance quality problems such as burrs. Therefore, the outer edge of the convex rib flat region 122a is directly connected to the rib table surface 121. In other embodiments, the connection between the outer edge of the convex rib flat region 122a and the rib table surface 121 can also be chamfered. The inner edge of the convex rib flat region 122a forms an acute angle with the joint surface of the convex rib 12 or the positioning boss 14 located above it. To ensure the appearance quality of the cup body 10, the inner edge of the convex rib flat region 122a is transitionally connected to the convex rib 12 or the positioning boss 14 located above it through an inwardly concave smooth surface. Similarly, in this embodiment, the angle between the outer edge of the convex ring flat region 152a and the outer surface of the convex ring 151 is close to a right angle. To ensure the appearance quality at this location, the outer edge of the convex ring flat region 152a is chamfered or rounded and then connected to the outer surface of the convex ring 151. In other implementations, the outer edge of the convex ring flat region 152a can also be directly connected to the outer surface of the convex ring 151. The interface between the convex ring flat region 152a and the convex rib 12 located above it forms an acute angle. To ensure the appearance quality of the cup body 10, the inner edge of the convex ring flat region 152a is transitionally connected to the convex rib 12 located above it through an inwardly concave smooth surface.

[0029] In this embodiment, the cup body 10 is made of polyetheretherketone material. Compared with common polyethylene materials, polyetheretherketone has higher strength, thus further reducing the wall thickness of the cup body 10. To reliably maintain the shape of the cup body 10 and ensure the stability of the spherical crown surface 111 inside the cup body 10, the larger the size of the cup body 10, the greater the wall thickness required. In the preferred solution, the wall thickness range of the cup body 10 with an outer diameter less than 17 mm is 1 mm - 2 mm, the wall thickness range of the cup body 10 with an outer diameter greater than or equal to 17 mm and less than or equal to 25 mm is 1.5 mm - 3.5 mm, and the wall thickness range of the cup body 10 with an outer diameter greater than 25 mm is 2 - 5 mm. The outer diameter mentioned here refers to the size and model of the outer peripheral contour of the cup body 10. In this embodiment, the outer diameter of the cup body 10 refers to the diameter of the spherical surface where the rib table surface 121 of the convex rib is located. To ensure the effectiveness of the convex rib 12 in cooperating with and limiting the bone cement, the protruding height of the convex rib 12 needs to be greater than or equal to 0.5 mm. At the same time, to obtain a thin-walled cup body 10 to enhance the anti-dislocation performance of the acetabular prosthesis, the protruding height of the convex rib 12 should be less than half of the wall thickness of the cup body 10.

[0030] In the prior art, the wall thickness of an acetabular prosthesis with an outer diameter of the cup body 10 less than 17 mm is usually at least 3 mm, while the maximum wall thickness of the cup body 10 in this embodiment is 2 mm. When performing hip joint replacement surgery with acetabular prostheses of the same outer diameter, the outer diameter of the ball head prosthesis that mates with this embodiment is at least 1 mm larger than the outer diameter of the ball head prosthesis accommodated in the acetabular prosthesis in the prior art. In this way, the displacement stroke required for the ball head prosthesis to dislocate from this embodiment is at least 1 mm larger than that in the prior art, the dislocation risk of the ball head prosthesis is significantly reduced, and the mobility of the hip joint is also enhanced.

[0031] In order to meet the requirements for the surface quality of the spherical crown surface 111 in the case of a small wall thickness, the preferred solution makes the following limitations on the shape profile of the convex rib 12: the convex rib base angle α of the convex rib 12 at the highest position is 3 - 7 times the convex rib top angle β, and the convex rib base angle α of the other convex ribs 12 is 3 - 5 times the convex rib top angle β. That is, in Figure 4 、 9 ∠α 1 is 3 - 7 times ∠β 1 and ∠α 2 is 3 - 5 times ∠β 2 .

[0032] As shown in Figure 4 , the convex rib base angle α is the central angle corresponding to the radian range of the convex rib base, and the convex rib top angle β is the central angle corresponding to the radian range of the convex rib top. In addition, as shown in Figure 4 , the positioning boss 14 protrudes upward from the middle of the upper side surface 122 of the convex rib 12 at the highest position. The convex rib plane area 122a of the upper side surface 122 of the convex rib 12 at the highest position is connected to the base of the centrally arranged positioning boss 14. The difference between the inner and outer diameters of this convex rib plane area 122a is significantly larger than that of the other convex rib plane areas 122a. Therefore, the convex rib base angle of the convex rib 12 at the highest position is also larger than that of the other convex ribs 12.

[0033] Furthermore, the more the number of convex ribs 12, the more the number of annular grooves 16, which ensures better limitation of the cup body 10 in the direction of the cup body center line a. Therefore, the convex rib top angle β is 3° - 9°. In this way, at least 2 convex ribs 12 are provided on the outer surface of the cup body 10, and thus at least 2 annular grooves 16 can be formed.

[0034] This embodiment, as shown in Figure 4 、 5As shown, the spherical crown surface 111 is arranged at a high position inside the cavity 11, and the inner wall surface of the cavity 11 further includes a conical surface 112 arranged at a low position. The spherical crown surface 111 and the conical surface 112 are connected by a smooth curved surface for transition. The height of the spherical crown surface 111 is less than its radius, that is, the center O of the sphere is located within the accommodating cavity of the conical surface 112. In this way, during use, the center of the spherical head prosthesis is located within the cavity 11 of the cup body 10. Thus, the displacement stroke required for the spherical head prosthesis to dislocate from the cup body 10 is greater than the radius of the spherical head prosthesis, reducing the risk of dislocation. Since the spherical head prosthesis is connected to the femoral stem through the neck, interference may occur between the cup mouth of the cup body 10 and the neck. A convex ring 15 is provided at the cup mouth of the cup body 10, so that the cup mouth of the cup body 10 has a greater thickness. A conical portion 112 is provided on the inner wall at this position, enabling the mouth of the cavity 11 to avoid the neck, thereby further increasing the mobility of the spherical head prosthesis.

[0035] As shown in the appendix Figure 1 、 3 During use, a developing wire 20 made of metal can be embedded in the annular groove 16, facilitating the acquisition of the installation attitude of the cup body 10 during medical examinations. In this embodiment, Figure 3 As shown, the developing wire 20 is an open ring and is integrally in a C shape.

[0036] Embodiment 2

[0037] The difference between this embodiment and Embodiment 1 lies in that concave notches 13 are circumferentially arranged at intervals along the upper ring edge of the convex ring 15. To prevent bone cement from overflowing from the outer periphery of the cup body 10, in this embodiment, the bottom of the concave notch 13 is connected to the upper ring surface 151a, that is, the arrangement position of the concave notch 13 is above the lower section 151b of the outer ring surface. For the convenience of processing in this embodiment, the concave notches 13 on the convex ring 15 and the concave notches 13 provided on the convex rib 12 are located in the same cylindrical surface.

Claims

1. A bionic acetabular prosthesis, comprising a cup body (10) in the shape of a spherical crown as a whole, wherein the bottom of the cup body (10) is recessed inward to form a cavity (11), and the inner wall surface of the cavity (11) comprises a spherical crown surface (111) that matches the outer diameter of the ball head prosthesis, characterized in that: The outer wall surface of the cup body (10) is provided with a plurality of convex ridges (12) which are in an overall ring shape. The cross section of the convex ridges (12) is in an overall trapezoidal shape with a large base and a small top. An annular groove (16) is formed at the connection between the bases of adjacent convex ridges (12). Concave notches (13) are provided at intervals in the circumferential direction on the upper ring of the convex ridges (12). The depth of the concave notches (13) is less than or equal to the protruding height of the convex ridges (12).

2. The bionic acetabular prosthesis according to claim 1, characterized in that: The prism surface (121) of the convex edge (12) away from the cavity (11) is located in the same spherical surface; A positioning boss (14) protruding upward is provided on the top of the cup body (10); the positioning boss (14) is mushroom-shaped with a small bottom and a large top; a table surface (141) of the positioning boss (14) and a ridge table surface (121) of the ridge (12) are located in the same spherical surface; A convex ring (15) is provided on the outer periphery of the bottom of the cup body (10); an upper ring surface (151a) of the outer ring surface (151) of the convex ring and the prism surface (121) are located on the same spherical surface; the bottom of the upper ring surface (151a) extends downward along the tangential direction of the spherical surface on which it is located to form a cylindrical lower ring surface (151b).

3. The bionic acetabular prosthesis according to claim 2, characterized in that: The upper ridge surface (122) of the ridge (12) comprises an annular planar ridge plane domain (122a), and the surfaces where the ridge plane domains (122a) are located are parallel; The outer edge of the convex ridge plane domain (122a) is directly connected to the prism surface (121) or is connected to the prism surface (121) after being chamfered / rounded, and the inner edge of the convex ridge plane domain (122a) is transitionally connected to the convex ridge (12) or the positioning boss (14) located above it through a concave smooth curved surface; The surface where the annular core of the ridge (12) is located is perpendicular to the center line (a) of the cup body, and the surface where the ridge plane domain (122a) is located is perpendicular to the center line (a) of the cup body.

4. The bionic acetabular prosthesis according to claim 2, characterized in that: The ridge base angle α of the highest ridge (12) is 3-7 times the ridge top angle β, and the ridge base angle α of the other ridges (12) is 3-5 times the ridge top angle β, wherein the ridge base angle α is defined as the center angle corresponding to the arc range of the ridge base, and the ridge top angle β is defined as the center angle corresponding to the arc range of the ridge top; the ridge top angle β is 3°-9°.

5. The bionic acetabular prosthesis according to claim 2, characterized in that: The upper edge of the convex ring (15) is provided with recesses (13) at intervals in the circumferential direction, and the bottom of the recesses (13) is connected to the upper ring surface (151a).

6. The bionic acetabular prosthesis according to claim 2, characterized in that: The surface where the core of the convex ring (15) is located is perpendicular to the center line (a) of the cup body. The upper ring surface (152) of the convex ring (15) includes a convex ring plane domain (152a) in the shape of an annular plane. The convex ring plane domain (152a) is perpendicular to the center line (a) of the cup body. The outer edge of the convex ring plane domain (152a) is directly connected to the convex ring outer ring surface (151) or connected to the convex ring outer ring surface (151) after chamfering / rounding. The inner edge of the convex ring plane domain (152a) is transitionally connected to the convex ridge (12) located above it through an inwardly concave smooth curved surface.

7. The bionic acetabular prosthesis according to any one of claims 1 to 6, characterized in that: The recess (13) arranged at the middle position in the height direction of the cup body (10) has a recess depth greater than the recess depth of the recess (13) located above or below it, and / or the recess width of the recess (13) arranged at the middle position in the height direction of the cup body (10) is greater than the recess width of the recess (13) located above or below it.

8. The bionic acetabular prosthesis according to claim 7, characterized in that: The inner concave surfaces of the recesses (13) which are located on the same side of the cup body (10) and arranged in a high and low manner are located in the same cylindrical surface.

9. The bionic acetabular prosthesis according to claim 8, characterized in that: The notches (13) are symmetrically arranged relative to the center line of the cup body (10), and the inner concave center lines (c, d) of the notches (13) arranged on both sides of the cup body center line (a) intersect above the cup body (10).

10. The bionic acetabular prosthesis according to claim 1, characterized in that: The cup mouth end face of the cup body (10) is a plane perpendicular to the center line (a) of the cup body, the spherical crown surface (111) is arranged at a high position inside the cavity (11), and the inner wall surface of the cavity (11) also includes a conical surface (112) arranged at a low position, the spherical crown surface (111) and the conical surface (112) are connected by a smooth curved surface transition, and the height of the spherical crown surface (111) is less than its radius; a developing wire (20) made of metal is embedded in the annular groove (16), and the developing wire (20) is C-shaped as a whole.

11. The bionic acetabular prosthesis according to claim 1, characterized in that: The cup body (10) is made of polyetheretherketone material. The wall thickness of the cup body (10) with an outer diameter less than 17 mm is in the range of 1 mm to 2 mm, the wall thickness of the cup body (10) with an outer diameter greater than or equal to 17 mm and less than or equal to 25 mm is in the range of 1.5 mm to 3.5 mm, and the wall thickness of the cup body (10) with an outer diameter greater than 25 mm is in the range of 2 to 5 mm. The protruding height of the ridge (12) is greater than or equal to 0.5 mm and less than half the wall thickness of the cup body (10).

Images