CN115944436A

CN115944436A - Femoral stem prosthesis

Info

Publication number: CN115944436A
Application number: CN202310242880.2A
Authority: CN
Inventors: 张先龙; 王�琦; 陈云苏; 王亚松; 张帅
Original assignee: Beijing AK Medical Co Ltd; Shanghai Sixth Peoples Hospital
Current assignee: Beijing AK Medical Co Ltd; Shanghai Sixth Peoples Hospital
Priority date: 2023-03-14
Filing date: 2023-03-14
Publication date: 2023-04-11
Anticipated expiration: 2043-03-14
Also published as: CN115944436B

Abstract

The invention provides a femoral stem prosthesis, comprising: a body provided with a feeding hole along a body insertion direction and an extension hole perpendicular to the body insertion direction; the feeding bolt is provided with a rotatable first section column and a movable second section column, the first section column and the second section column can rotate and are inserted in the feeding hole together; the extension body is provided with a first convex part and a splitting part, is inserted in the extension hole and has a contraction position and an extension position; the reset element is provided with a first baffle abutting against the first convex part and a second baffle perpendicular to the first baffle, and has an initial position and a reset position. By applying the technical scheme of the invention, the problems of looseness and difficulty in taking out of the femoral stem in the late implantation period in the related technology can be solved.

Description

Femoral stem prosthesis

Technical Field

The invention relates to the technical field of medical instruments, in particular to a femoral stem prosthesis.

Background

The total hip replacement is one of the most common operations for treating femoral head necrosis and severe hip osteoarthritis in the joint orthopedics department at present, and the excellent curative effect of the total hip replacement on relieving pain of patients, recovering joint functions after operation and the like is accepted all over the world.

However, over time, late complications are of increasing concern. The direct reason for the prosthesis loosening is that the mechanical property of the osseous support structure is reduced due to the osteolysis, the mechanical stability of the prosthesis is lost, the real reason for the osteolysis is complicated, and the prosthesis structure is one of the reasons for the prosthesis loosening; meanwhile, when the artificial hip joint needs to be repaired due to other reasons, such as patient factors, operation factors and the like, the femoral stem prosthesis is often required to be taken out.

In the prior art, the femoral stem prosthesis is often difficult to remove by means of external tools and brute force.

Aiming at the problems, the invention provides a femoral stem prosthesis, which solves the problems of looseness and difficulty in taking out in the late implantation period of the femoral stem in the related technology by optimally designing the structure of the prosthesis.

Disclosure of Invention

The invention provides a femoral stem prosthesis, comprising: a body provided with a feeding hole along a body insertion direction and an extension hole perpendicular to the body insertion direction; the feeding bolt is provided with a rotatable first section column and a movable second section column, and the first section column and the second section column can rotate and are inserted into the feeding hole together; the extension body is provided with a first convex part and a splitting part, is inserted in the extension hole and has a contraction position and an extension position; the reset element is provided with a first baffle abutting against the first convex part and a second baffle perpendicular to the first baffle, and has an initial position and a reset position.

Furthermore, the feeding hole is provided with a first section of hole and a second section of hole, and the inner wall of the first section of hole is provided with internal threads; and the side wall of the second section hole is provided with a guide rail along the axial direction of the feeding hole.

Furthermore, the tail end of the second section hole is provided with a reset cavity, the reset cavity can accommodate a reset element, the side wall of the reset cavity is provided with a reset hole, and a reset shaft can be inserted into the reset hole.

Furthermore, the extension hole is provided with a third section of hole and a fourth section of hole, and the inner wall of the third section of hole is smooth; the cross-sectional area of the fourth section of hole is gradually increased from the inside of the main body to the outside of the main body.

Furthermore, split ribs are arranged in the extending holes, traverse the connecting part of the fourth section of holes and the outer wall of the main body, and the cross section width of the split ribs is gradually increased from the inside of the main body to the outside of the main body.

Further, the outer wall of the first section of column of the feeding bolt is provided with an external thread, the top of the first section of column is provided with an operation part, the bottom of the first section of column is provided with a first rotating part, the top of the second section of column is provided with a second rotating part, and the first rotating part and the second rotating part are mutually abutted and can rotate mutually.

Furthermore, a guide groove and a concave part are formed in the side wall of the second section of the column of the feeding bolt, the guide groove is symmetrically arranged, the concave part is symmetrically arranged, and the guide groove and the concave part are arranged at intervals; and a second convex part is arranged at the bottom of the second section of column, and a guide arc surface is arranged at the joint of the guide groove and the second convex part.

Further, the maximum cross-sectional area of the first protrusion of the extension is larger than the cross-sectional area of the split portion.

Furthermore, a splitting gap is arranged in the middle of the splitting part and abuts against the innermost side of the splitting rib of the extension hole.

Furthermore, a reinforcing rib is arranged at the joint of the first baffle plate and the second baffle plate of the reset element, and the reset element is rotatably inserted into the reset cavity of the second section of hole.

By applying the technical scheme of the invention, the femoral stem prosthesis comprises: the prosthesis stabilizing device comprises a main body, a feeding bolt, an extension body and a reset element, wherein the feeding bolt converts rotary motion into linear motion, pushes the extension body to be converted from a contraction position to an extension position, and further pushes the reset element to be converted from an original position to a reset position, so that the prosthesis stabilizing effect is achieved; the feeding bolt is continuously rotated to push the reset element to be converted from the reset position to the original position, and further push the extension body to be converted from the extending position to the retracting position, so that the prosthesis can be conveniently taken out. Can solve the problems of loosening and difficult taking out of the femoral stem in the late implantation period in the related technology.

Drawings

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

fig. 1 illustrates a partial exploded view of a femoral stem prosthesis provided in accordance with an embodiment of the present invention;

FIG. 2 illustrates a partial cross-sectional view of a femoral stem prosthesis provided in accordance with an embodiment of the present invention;

fig. 3 shows a partial cross-sectional view of the body of the femoral stem prosthesis of fig. 1;

FIG. 4 showsbase:Sub>A cross-sectional view at A-A in FIG. 3;

fig. 5 shows an exploded view of the feed bolt of the femoral stem prosthesis of fig. 1;

fig. 6 shows a rotary cross-sectional view of the feed bolt of the femoral stem prosthesis of fig. 1;

fig. 7 shows a schematic view of the structure of an extension of the femoral stem prosthesis of fig. 1;

fig. 8 shows a schematic structural view of a reduction element of the femoral stem prosthesis of fig. 1.

Wherein the figures include the following reference numerals:

10. a main body; 11. a feed hole; 111. a first section of bore; 1111. an internal thread; 112. a second section of holes; 1121. a guide rail; 1122. a reset chamber; 1123. a reset hole; 12. an extension hole; 121. a third section of holes; 122. a fourth section of hole; 1221. splitting ribs;

20. feeding a bolt; 21. a first section of column; 211. an external thread; 212. a first rotating part; 213. an operation unit; 22. a second section of column; 221. a recess; 222. a guide groove; 223. a second convex portion; 2231. a guiding cambered surface; 224. a second rotating part; 23. a rolling bearing;

30. an extension body; 31. a first convex portion; 32. a splitting section; 321. splitting the gap;

40. a reset element; 41. a first baffle; 42. a second baffle; 43. reinforcing ribs; 44. and a reset shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 2, the present invention provides a femoral stem prosthesis, including: a main body 10 provided with a feeding hole 11 along an insertion direction of the main body 10 and an extension hole 12 perpendicular to the insertion direction of the main body 10; the feeding bolt 20 is provided with a rotatable first section column 21 and a movable second section column 22, and the first section column 21 and the second section column 22 can rotate and are inserted into the feeding hole 11 together; an extension body 30 provided with a first protrusion 31 and a split part 32, inserted in the extension hole 12, and having a retracted position and an extended position; the reset element 40 includes a first shutter 41 abutting on the first projection 31 and a second shutter 42 perpendicular to the first shutter 41, and has an initial position and a reset position.

As shown in fig. 3 and 4, the feeding hole 11 is provided with a first section hole 111 and a second section hole 112, and the inner wall of the first section hole 111 is provided with an internal thread 1111; the side wall of the second section hole 112 is provided with a guide rail 1121 along the axial direction of the feeding hole 11; a reset cavity 1122 is arranged at the tail end of the second section hole 112, the reset cavity 1122 can accommodate the reset element 40, a reset hole 1123 is arranged on the side wall of the reset cavity 1122, and a reset shaft 44 can be inserted into the reset hole 1123; the extension hole 12 is provided with a third section of hole 121 and a fourth section of hole 122, and the inner wall of the third section of hole 121 is smooth; the cross-sectional area of the fourth section of the hole 122 gradually increases from the inside of the main body 10 to the outside of the main body 10; the split rib 1221 is arranged in the extending hole 12, traverses the joint of the fourth section of hole 122 and the outer wall of the main body 10, and the cross-sectional width of the split rib gradually increases from the inside of the main body 10 to the outside of the main body 10.

As shown in fig. 5 and 6, the outer wall of the first section of the column 21 of the feeding bolt 20 is provided with an external thread 211, the top is provided with an operating part 213, the bottom is provided with a first rotating part 212, the top of the second section of the column 22 is provided with a second rotating part 224, and the first rotating part 212 and the second rotating part 224 are abutted against each other and can rotate with each other. The side wall of the second section of the column 22 of the feeding bolt 20 is provided with a guide groove 222 and a concave part 221, the guide groove 222 is symmetrically arranged, the concave part 221 is symmetrically arranged, and the guide groove 222 and the concave part 221 are arranged at intervals; the bottom of the second section of column 22 is provided with a second convex part 223, and the joint of the guide groove 222 and the second convex part 223 is provided with a guide arc surface 2231.

In the present embodiment, the first rotating portion 212 and the second rotating portion 224 are connected by a bearing, wherein the first rotating portion 212 and the second rotating portion 224 are respectively in interference fit with the rolling bearing 23, which can ensure the connection strength and reduce the friction resistance.

In this embodiment, the operation portion 213 is a six-hole inner portion, and the first-stage column 21 of the feed bolt 20 can be rotated by an external tool to push the second-stage column 22 downward along the feed hole 11.

In particular, the concave portion 221 will avoid the first convex portion 31 of the extension 30 when the second convex portion 223 pushes the reset element 40 from the reset position to the initial position, so as to smoothly change from the extended position to the retracted position.

As shown in fig. 7, the maximum cross-sectional area of the first protrusion 31 of the extension 30 is larger than that of the split 32. The split portion 32 has a split gap 321 in the middle and abuts against the innermost split rib 1221 of the extension hole 12.

The first projection 31 is pressed by the second projection 223 and moves from the inside of the body 10 to the outside of the body 10 along the extension hole 12.

As shown in fig. 8, a reinforcing rib 43 is arranged at the joint of the first baffle plate 41 and the second baffle plate 42 of the resetting element 40 to ensure the connection strength of the first baffle plate 41 and the second baffle plate 42; the reset element 40 is rotatably inserted into the reset chamber 1122 of the second section aperture 112.

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.

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 the terms have no special meanings unless otherwise stated, 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 femoral stem prosthesis, comprising:

a main body (10) provided with a feed hole (11) along an insertion direction of the main body (10) and an extension hole (12) perpendicular to the insertion direction of the main body (10);

the feeding bolt (20) is provided with a rotatable first section column (21) and a movable second section column (22), the first section column (21) and the second section column (22) can rotate and are inserted into the feeding hole (11) together;

an extension body (30) provided with a first convex part (31) and a split part (32), inserted in the extension hole (12), and having a contraction position and an extension position;

the reset element (40) is provided with a first baffle (41) which is abutted against the first convex part (31) and a second baffle (42) which is perpendicular to the first baffle (41), and has an initial position and a reset position.

2. Femoral stem prosthesis according to claim 1, characterized in that the feed hole (11) is provided with a first section of hole (111) and a second section of hole (112), the inner wall of the first section of hole (111) being provided with an internal thread (1111); the side wall of the second section hole (112) is provided with a guide rail (1121) along the axial direction of the feeding hole (11).

3. The femoral stem prosthesis according to claim 2, wherein the second segment hole (112) is provided with a reset cavity (1122) at the end, the reset cavity (1122) can accommodate the reset element (40), the side wall of the reset cavity (1122) is provided with a reset hole (1123), and the reset hole (1123) can be inserted with the reset shaft (44).

4. The femoral stem prosthesis according to claim 1, wherein the extension hole (12) is provided with a third section of hole (121) and a fourth section of hole (122), and the inner wall of the third section of hole (121) is smooth; the cross-sectional area of the fourth section of hole (122) is gradually increased from the inside of the main body (10) to the outside of the main body (10).

5. A femoral stem prosthesis according to claim 4, wherein the split ribs (1221) are provided in the extension holes (12) and traverse the junction between the fourth segment of holes (122) and the outer wall of the body (10), and the cross-sectional width thereof gradually increases from the inside of the body (10) to the outside of the body (10).

6. Femoral stem prosthesis according to claim 1, wherein the outer wall of the first section of the column (21) of the feeding bolt (20) is provided with external threads (211), the top part is provided with an operating part (213), the bottom part is provided with a first rotating part (212), the top part of the second section of the column (22) is provided with a second rotating part (224), and the first rotating part (212) and the second rotating part (224) are mutually abutted and rotatable.

7. Femoral stem prosthesis according to claim 1, wherein the second section of the post (22) of the feeding bolt (20) is provided with a guide groove (222) and a recess (221) on the side wall, the guide groove (222) is symmetrically arranged, the recess (221) is symmetrically arranged, and the guide groove (222) and the recess (221) are arranged at intervals; the bottom of the second section of column (22) is provided with a second convex part, and a guide arc surface (2231) is arranged at the joint of the guide groove (222) and the second convex part.

8. Femoral stem prosthesis according to claim 7, characterized in that the maximum cross-sectional area of the first protrusion (31) of the extension body (30) is larger than the cross-sectional area of the split part (32).

9. Femoral stem prosthesis according to claim 1, characterized in that the split part (32) is provided with a split gap (321) in the middle, abutting against the innermost split rib (1221) of the elongated hole (12).

10. Femoral stem prosthesis according to claim 1, characterized in that the reduction element (40) has a reinforcement rib (43) at the connection of the first flap (41) and the second flap (42), the reduction element (40) being rotatably inserted in the reduction chamber (1122) of the second segment of the hole (112).