CN213076100U

CN213076100U - Inner liner and acetabulum assembly with same

Info

Publication number: CN213076100U
Application number: CN202021343656.0U
Authority: CN
Inventors: 王彩梅
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2021-04-30
Anticipated expiration: 2030-07-09

Abstract

The utility model provides a inside lining and have its acetabular bone subassembly, wherein, the inside lining includes: the inside lining body has the opening, and the surface of inside lining body is first spherical surface, and the internal surface of inside lining body is the spherical surface of second, first spherical surface and the eccentric setting of the spherical surface of second, and the distance of the centre of a circle of first spherical surface and the plane at opening place is greater than the distance of the centre of a circle of the spherical surface of second and the plane at opening place. The technical scheme of this application has solved the poor problem of structural strength of inside lining among the correlation technique effectively.

Description

Inner liner and acetabulum assembly with same

Technical Field

The utility model relates to an orthopedic implant field particularly, relates to a inside lining and have its acetabular bone subassembly.

Background

Currently, artificial hip surgery has been known for over 30 years. The traditional Chinese medicine is the only treatment method capable of maintaining joint functions for patients with femoral head necrosis, old femoral neck fracture, comminuted acetabular fracture, femoral head tumor and the like. Through years of clinical application and improvement, the hip joint replacement effect is good, the excellent rate of 10 years generally can reach about 90%, and the excellent rate of 15-20 years still reaches more than 85%. With the continuous improvement of the manufacturing process and the material of the artificial joint, the effect is also improved, and the service life is also greatly prolonged.

In the related art, the femoral head is installed inside the acetabular prosthesis, the thickness of the whole acetabular prosthesis is uniform and thin, and the force applied to the acetabular prosthesis is mainly concentrated on the top of the inside of the acetabular prosthesis, namely the force applied to the acetabular prosthesis by the femoral head. The force applied to the acetabulum prosthesis by the femoral head for a long time easily causes damage and fracture of the acetabulum prosthesis, thereby affecting the use effect of a patient.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at provides a inside lining and have its acetabular bone subassembly to solve the poor problem of structural strength of the inside lining among the correlation technique.

In order to achieve the above object, according to an aspect of the present invention, there is provided a liner, including: the inside lining body has the opening, and the surface of inside lining body is first spherical surface, and the internal surface of inside lining body is the spherical surface of second, first spherical surface and the eccentric setting of the spherical surface of second, and the distance of the centre of a circle of first spherical surface and the plane at opening place is greater than the distance of the centre of a circle of the spherical surface of second and the plane at opening place.

Further, a bone cement groove is arranged on the outer surface of the lining body and comprises an annular groove and a longitudinal groove perpendicular to the annular groove.

Further, the ring channel is close to the top setting of inside lining body, and vertical groove is close to the bottom setting of inside lining body, is provided with the interval between ring channel and the vertical groove.

Furthermore, the position that the surface of inside lining body is close to the bottom of inside lining body still is provided with first conical surface, and vertical groove sets up on first conical surface.

Further, the inside lining still includes the spacing protruding wall that sets up in the bottom of inside lining body, and spacing protruding wall is downwards salient in the bottom of inside lining body.

Furthermore, the bottom surface of the limiting convex wall is coplanar with the bottom surface of the lining body, and/or a first plane part and a positioning column are arranged at the top of the lining body, and the positioning column is located on the first plane part.

Further, still be provided with the curb plate on the inside lining body, the curb plate is connected with spacing convex wall and extends towards the outside of inside lining body, is provided with biological coating on the surface of curb plate, is provided with first mounting hole on the curb plate.

According to another aspect of the present invention, there is provided an acetabular component including a liner and an outer cup mounted outside the liner, the liner being the liner described above.

Furthermore, the inner surface of the outer cup is a third spherical surface, the third spherical surface is matched with the first spherical surface of the lining, the outer surface of the lining body of the lining is also provided with a first conical surface, the inner surface of the outer cup is also provided with a second conical surface, and the first conical surface is matched with the second conical surface.

Further, the top of inside lining body is provided with first plane portion and reference column, and the top of outer cup is provided with second plane portion and second mounting hole, and the reference column inserts to in the second mounting hole, first plane portion and the cooperation of second plane portion.

Use the technical scheme of the utility model, the inside lining body includes first spherical face and the spherical face of second, and the surface of inside lining body is first spherical face, and the internal surface of inside lining body is the spherical face of second, first spherical face and the eccentric settings of the spherical face of second, and the centre of a circle of first spherical face is greater than the centre of a circle of the spherical face of second apart from the distance of the face at opening place apart from the centre of a circle of first spherical face. Through the eccentric arrangement, the thickness of the top of the lining body is larger. When the lining body is used, the top of the lining body can bear large force due to large thickness, so that the integral structural strength of the lining is increased, and the lining is prevented from being damaged. Therefore, the technical scheme of the application effectively solves the problem of poor structural strength of the liner in the related art.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

figure 1 shows a schematic cross-sectional view of an embodiment of a liner according to the present invention;

FIG. 2 shows a schematic perspective view of the liner of FIG. 1;

FIG. 3 shows a side view schematic of the liner of FIG. 1;

FIG. 4 shows a schematic top view of the liner of FIG. 1;

FIG. 5 shows a perspective view of the liner of FIG. 1 from another perspective;

FIG. 6 shows a schematic side view from another perspective of the liner of FIG. 1;

figure 7 shows a perspective view of an embodiment of an acetabular component according to the invention;

FIG. 8 illustrates a perspective view of another perspective of the acetabular assembly of FIG. 7;

FIG. 9 illustrates a side schematic view of the acetabular assembly of FIG. 7;

FIG. 10 illustrates a cross-sectional schematic view of the acetabular assembly of FIG. 7;

FIG. 11 illustrates a side schematic view from another perspective of the acetabular assembly of FIG. 7;

FIG. 12 illustrates a perspective view of the outer cup of the acetabular assembly of FIG. 7; and

figure 13 shows a schematic cross-sectional view of the outer cup of figure 12.

Wherein the figures include the following reference numerals:

10. a liner body; 11. an opening; 12. a first spherical surface; 13. a second spherical surface; 14. a bone cement trough; 141. an annular groove; 142. a longitudinal slot; 15. a first conical surface; 16. a first planar portion; 17. a positioning column; 18. a side plate; 181. a first mounting hole; 20. a limiting convex wall; 30. an outer cup; 31. a third spherical surface; 32. a second conical surface; 33. a second planar section; 34. and a second mounting hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In order to increase the structural strength of the liner, it is made more durable. In the present embodiment, as shown in fig. 1 to 6, the liner includes: the lining body 10 is provided with an opening 11, the outer surface of the lining body 10 is a first spherical surface 12, the inner surface of the lining body 10 is a second spherical surface 13, the first spherical surface 12 and the second spherical surface 13 are eccentrically arranged, and the distance between the circle center a of the first spherical surface 12 and the plane where the opening 11 is located is larger than the distance between the circle center b of the second spherical surface 13 and the plane where the opening 11 is located.

By applying the technical solution of this embodiment, the lining body 10 includes a first spherical surface 12 and a second spherical surface 13, the first spherical surface 12 is an outer surface of the lining body 10, the second spherical surface 13 is an inner surface of the lining body 10, the first spherical surface 12 and the second spherical surface 13 are eccentrically disposed, and a distance from a circle center a of the first spherical surface 12 to a surface where the opening 11 is located is greater than a distance from a circle center b of the second spherical surface 13 to the surface where the opening 11 is located. Through foretell eccentric settings for the thickness at the top of inside lining body 10 is great, and when the thickness increase on the top of inside lining body 10, inside lining body 10 was when using, and its top is because thickness is great, consequently can bear great power, and then makes the holistic structural strength of inside lining increase, prevents that the inside lining from being damaged. Therefore, the technical scheme of the embodiment effectively solves the problem of poor structural strength of the liner in the related art.

The lining is made of wear-resistant medical metal or ceramic materials, and the use of the material can provide a wear-resistant inner joint surface and can be matched with a ball head made of metal, ceramic or polyethylene materials for use; the medical metal or ceramic material replaces polyethylene as a lining, so that screw holes on the acetabular cup can be prevented from being used as a channel for polyethylene grinding dust to enter sclerotin, and aseptic loosening caused by bone absorption and osteolysis can be effectively reduced.

The lining made of ceramic materials can be matched with a ceramic ball head and a polyethylene ball head with large diameters, and the advantage of the ball head with the large diameters is achieved. The inner lining made of metal can be matched with the polyethylene ball head with large diameter, and the advantage of the ball head with large diameter is realized.

As shown in fig. 1, in the present embodiment, the distance between the center a of the first spherical surface 12 and the center b of the second spherical surface 13 is 5 mm, which is effective to ensure the thickness of the top of the liner body 10. Of course, the structural strength requirement of the liner may be satisfied as long as the distance between the center a of the first spherical surface 12 and the center b of the second spherical surface 13 is between 2 mm and 8 mm. The specific distance size needs to be designed according to actual conditions.

In consideration of the fact that the inner liner body 10 is easily detached from the outer cup 30 or easily rotated in the outer cup 30, as shown in fig. 2 to 4 and 6, in the present embodiment, a bone cement groove 14 is provided on the outer surface of the inner liner body 10, and the bone cement groove 14 includes an annular groove 141 and a longitudinal groove 142 perpendicular to the annular groove 141. The annular groove 141 and the longitudinal groove 142 enable the connection of the bone cement from two directions, i.e., a horizontal direction and a direction perpendicular to the annular groove 141 along the outer surface of the liner body 10. The bone cement in the annular groove 141 can prevent the lining body 10 from being separated from the outer cup 30, the bone cement in the longitudinal groove 142 can prevent the lining body 10 from rotating in the outer cup 30, so that the lining body 10 is more stable in the outer cup 30, the longitudinal groove 142 is stopped on the equatorial plane, when the bone cement is implanted, the bone cement is easily pressed, and the filling strength of the bone cement is ensured. The bottom of the longitudinal groove 142 is a minimum distance of 2 mm from the opening 11. The longitudinal grooves 142 extend from the top to the bottom along the outer surface of the liner body 10, and the plurality of longitudinal grooves 142 are radially disposed.

In order to prevent the bone cement from moving in the bone cement groove 14 due to gravity, as shown in fig. 2 to 4, in the present embodiment, the annular groove 141 is disposed near the top end of the lining body 10, the longitudinal groove 142 is disposed near the bottom end of the lining body 10, and a space is disposed between the annular groove 141 and the longitudinal groove 142. The interval between the annular groove 141 and the longitudinal groove 142 can prevent the bone cement from flowing from the annular groove 141 into the longitudinal groove 142, so that the bone cement can be stabilized in the annular groove 141 and the longitudinal groove 142, respectively, and thus the coupling effect can be improved.

As shown in fig. 1 and 3, in the present embodiment, the outer surface of the liner body 10 is further provided with a first conical surface 15 at a position close to the bottom end of the liner body 10, and the longitudinal groove 142 is provided on the first conical surface 15. The arrangement of the first conical surface 15 provides a surface for the longitudinal groove 142 to be arranged.

In order to make the liner more stable and avoid the liner from separating, as shown in fig. 1, fig. 3 and fig. 6, in this embodiment, the liner further includes a limiting convex wall 20 disposed at the bottom end of the liner body 10, and the limiting convex wall 20 protrudes downward from the bottom end of the liner body 10. The lining body 10 is formed in a hemispherical shape as a whole. For patients who are prone to post-operative dislocation, the arrangement of the limiting convex wall 20 can provide additional protection, and effectively reduce the probability of dislocation. In this embodiment, the protruding angle of the limiting convex wall 20 protruding from the bottom surface of the lining body 10 is 10 °, and at this time, the anti-dropping function can be effectively achieved. The angle of the limiting convex wall 20 protruding from the bottom surface of the lining body 10 is between 5 degrees and 15 degrees, which can meet the above requirement.

As shown in fig. 1, 3 and 6, in the present embodiment, the bottom surface of the stopper protrusion wall 20 is coplanar with the bottom surface of the liner body 10. The top of the lining body 10 is provided with a first plane part 16 and a positioning column 17, and the positioning column 17 is located on the first plane part 16. The location posts 17 serve as guides to allow the liner to be effectively installed in place when installed in the outer cup 30, even when the alignment cannot be clearly observed. The bottom surface of spacing protruding wall 20 and the bottom surface coplane of inside lining body 10 make the bottom of inside lining more regular, avoid appearing the edges and corners, and influence patient's postoperative and resume.

In order to stabilize the connection effect of the lining, as shown in fig. 1 to 5, in this embodiment, a side plate 18 is further disposed on the lining body 10, the side plate 18 is connected to the limiting convex wall 20 and extends toward the outside of the lining body 10, a biological coating is disposed on the surface of the side plate 18, and a first mounting hole 181 is disposed on the side plate 18. The side plate 18 is used for fixing with the ilium and is connected to the ilium through the first mounting hole 181 by screws, and further provides support for the inner lining. While side plate 18 is provided with a bio-coating that allows side plate 18 to have better contact with the bone structure and allows the bone structure to grow.

In accordance with another aspect of the present embodiment, as shown in fig. 7-13, there is provided an acetabular assembly including a liner and an outer cup 30 mounted to an exterior of the liner, the liner being as described above. The liner has good structural strength, so the acetabular component with the liner has the advantages.

As shown in fig. 7 to 13, the inner surface of the outer cup 30 is a third spherical surface 31, the third spherical surface 31 is engaged with the first spherical surface 12 of the liner, the outer surface of the liner body 10 of the liner is further provided with a first conical surface 15, the inner surface of the outer cup 30 is further provided with a second conical surface 32, and the first conical surface 15 is engaged with the second conical surface 32. The cooperation of the third spherical surface 31 with the first spherical surface 12 and the cooperation of the first conical surface 15 and the second conical surface 32 makes the cooperation of the inner liner and the outer cup 30 more stable.

As shown in fig. 7 to 13, the top of the lining body 10 is provided with a first flat portion 16 and a positioning column 17, the top of the outer cup 30 is provided with a second flat portion 33 and a second mounting hole 34, the positioning column 17 is inserted into the second mounting hole 34, and the first flat portion 16 is engaged with the second flat portion 33. The positioning column 17 is in clearance fit with the second mounting hole 34, so that the positioning column 17 can be conveniently inserted into the second mounting hole 34, the positioning column 17 plays a role in positioning and guiding, and the first flat part 16 is matched with the second flat part 33, so that the lining and the outer cup 30 are in closer contact.

The positioning column 17 is of a cylindrical structure, and the second mounting hole 34 has a cylindrical inner wall. Especially, for the inner liner with the anti-falling limit convex wall, the operation visual field is originally poor, and the direction is further uncertain by the limit convex wall, so the cylindrical surface guidance of the positioning column 17 is very important.

In this embodiment, the liner may also be fitted with a double-acting system, constituting a double-acting total hip system. The inner lining is fixed through bone cement and is directly lifted into the acetabular cup, so that the diameter of the inner spherical surface is lifted again, and the advantage of a large-diameter ball head is achieved.

The liner may also cooperate with the outer cup 30 to form an acetabular component.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A liner, comprising:

the lining comprises a lining body (10) and is provided with an opening (11), wherein the outer surface of the lining body (10) is a first spherical surface (12), the inner surface of the lining body (10) is a second spherical surface (13), the first spherical surface (12) and the second spherical surface (13) are eccentrically arranged, and the distance between the circle center a of the first spherical surface (12) and the plane where the opening (11) is located is larger than the distance between the circle center b of the second spherical surface (13) and the plane where the opening (11) is located.

2. The liner according to claim 1, wherein a cement groove (14) is provided on an outer surface of the liner body (10), the cement groove (14) comprising an annular groove (141) and a longitudinal groove (142) perpendicular to the annular groove (141).

3. The liner according to claim 2, wherein the annular groove (141) is disposed proximate a top end of the liner body (10), the longitudinal groove (142) is disposed proximate a bottom end of the liner body (10), and a space is disposed between the annular groove (141) and the longitudinal groove (142).

4. The liner according to claim 3, wherein the outer surface of the liner body (10) is further provided with a first conical surface (15) near the bottom end of the liner body (10), the longitudinal groove (142) being provided on the first conical surface (15).

5. The liner according to claim 1, further comprising a stopper convex wall (20) provided at the bottom end of the liner body (10), wherein the stopper convex wall (20) protrudes downward from the bottom end of the liner body (10).

6. The liner according to claim 5, wherein the bottom surface of the limiting convex wall (20) is coplanar with the bottom surface of the liner body (10), and/or the top of the liner body (10) is provided with a first plane part (16) and a positioning column (17), and the positioning column (17) is positioned on the first plane part (16).

7. The liner according to claim 5, wherein a side plate (18) is further disposed on the liner body (10), the side plate (18) is connected to the limiting convex wall (20) and extends towards the outside of the liner body (10), a biological coating is disposed on the surface of the side plate (18), and a first mounting hole (181) is disposed on the side plate (18).

8. An acetabular assembly comprising a liner and an outer cup (30) mounted externally of the liner, characterised in that the liner is a liner according to any one of claims 1 to 7.

9. The acetabular assembly according to claim 8, wherein the inner surface of the outer cup (30) is a third spherical surface (31), the third spherical surface (31) cooperating with the first spherical surface (12) of the liner, the outer surface of the liner body (10) of the liner further being provided with a first conical surface (15), the inner surface of the outer cup (30) further being provided with a second conical surface (32), the first conical surface (15) and the second conical surface (32) cooperating.

10. The acetabular assembly according to claim 8, wherein a first flat portion (16) and a positioning post (17) are provided on a top of the liner body (10), a second flat portion (33) and a second mounting hole (34) are provided on a top of the outer cup (30), the positioning post (17) is inserted into the second mounting hole (34), and the first flat portion (16) is engaged with the second flat portion (33).