CN107496058B

CN107496058B - Femoral prosthesis

Info

Publication number: CN107496058B
Application number: CN201710700496.7A
Authority: CN
Inventors: 孟德松; 刘敏; 庞博
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2017-08-15
Filing date: 2017-08-15
Publication date: 2023-07-28
Anticipated expiration: 2037-08-15
Also published as: CN107496058A

Abstract

The invention provides a femoral prosthesis, which comprises a femoral stem body and a stem body proximal end, and further comprises: the first end of the connecting part is connected with the femoral stem body, and the second end of the connecting part is connected with the proximal end of the stem body, so that the femoral stem body and the proximal end of the stem body are connected through the connecting part; the connecting part is movably arranged on the femoral stem body along a preset direction so that the proximal end of the stem body moves relative to the femoral stem body. The femoral prosthesis solves the problem that in the prior art, when the limiting function is provided for the femoral prosthesis, tension to the distal end of femur is generated on the lining.

Description

Femoral prosthesis

Technical Field

The invention relates to the field of artificial prostheses, in particular to a femoral prosthesis.

Background

Artificial hip arthroplasty (THA) is one of the most successful surgical procedures in the 20 th century, and is effective in eliminating joint pain, reconstructing joint function, and correcting deformity, thereby improving the quality of life of patients. The hip joint diseases are different in form, some patients have unsound ligament functions and low muscle strength levels, and the patients generally need to replace the hip joint prosthesis with a limited type to obtain long-term stable joint functions.

Currently, the limited artificial hip joints are: (1) a constrained liner prosthesis; (2) a hinged prosthesis; (3) tumor type prostheses, and the like. Among them, the hinge type prosthesis and the tumor type prosthesis have high cost, the mobility is limited to a certain extent, and the osteotomy amount needs to be increased, which belongs to oversherapy for patients with better bones.

The polyethylene lining of the limiting type lining prosthesis is connected with the metal acetabular cup in a mechanical mode, so that the situation of dislocation of joints can be avoided, but when a limiting function is provided for a femoral stem, a pulling force towards the distal end of a femur is generated on the lining, the pulling force is transmitted to the metal acetabulum, a tendency of pulling out the acetabular fossa is generated on the metal acetabulum, the metal acetabulum is loosened long time, and the service life of the prosthesis is shortened.

Disclosure of Invention

The invention mainly aims to provide a femoral prosthesis, which solves the problem that the liner generates tension to the distal end of femur when the femoral prosthesis is provided with a limiting function in the prior art.

In order to achieve the above object, the present invention provides a femoral prosthesis comprising a femoral stem body and a stem proximal end, the femoral prosthesis further comprising: the first end of the connecting part is connected with the femoral stem body, and the second end of the connecting part is connected with the proximal end of the stem body, so that the femoral stem body and the proximal end of the stem body are connected through the connecting part; the connecting part is movably arranged on the femoral stem body along a preset direction so that the proximal end of the stem body moves relative to the femoral stem body.

Further, the proximal end of the stem body may be disposed proximally or distally relative to the femoral stem body.

Further, a first connecting hole is formed in the femoral stem body, and the first end of the connecting portion movably penetrates through the first connecting hole.

Further, the connecting portion includes: the guide post is movably arranged in the first connecting hole in a penetrating way.

Further, the femoral prosthesis further comprises: and the wear-resisting ring is arranged in the first connecting hole, and the guide post movably penetrates through the wear-resisting ring.

Further, a second connecting hole is formed in the proximal end of the handle body, and the second end of the connecting portion is arranged in the second connecting hole in a penetrating mode.

Further, the connecting portion further includes: the locking vertebrae are connected with the guide posts and penetrate through the second connecting holes.

Further, the guide post is integrally formed with the locking vertebra.

Further, the proximal end of the handle body is provided with a locking hole for the first fastening piece to pass through, and the locking hole is communicated with the second connecting hole so that the first fastening piece can be in locking connection with the connecting part after passing through the locking hole.

Further, the femoral prosthesis further comprises: the cushion block is arranged between the femoral stem body and the proximal end of the stem body, one end face of the cushion block is attached to the femoral stem body, and the other end face of the cushion block is attached to the proximal end of the stem body.

Further, the cushion block is provided with a first fastening hole for the second fastening piece to pass through, the femoral stem body is provided with a second fastening hole for the second fastening piece to pass through, and the first fastening hole and the second fastening hole are oppositely arranged so that the second fastening piece passes through the first fastening hole and the second fastening hole.

Further, the first end face of the cushion block and the second end face of the cushion block form a preset angle.

The femoral prosthesis avoids the transmission of force between the femoral stem body and the proximal end of the stem body through the connecting part, wherein the first end of the connecting part is connected with the femoral stem body, the second end of the connecting part is connected with the proximal end of the stem body, and the proximal end of the stem body can move relative to the femoral stem body by movably arranging the connecting part on the femoral stem body along a preset direction.

In the femoral prosthesis in the prior art, as the proximal ends of the femoral stem body and the stem body are relatively fixedly arranged, the phenomenon that the femoral stem body drags the proximal end of the stem body to drag a metal acetabulum connected with the proximal end of the stem body to loosen the proximal end of the stem body can occur, and the normal recovery of a patient is affected. Compared with the prior art, the proximal end of the shank body of the femoral prosthesis is enabled to be movably arranged corresponding to the femoral shank body through the connecting part, so that force transmission between the femoral shank body and the proximal end of the shank body is eliminated, and the problem that tension to the distal end of the femur is generated on the lining when a limiting function is provided for the femoral prosthesis in the prior art is solved.

Drawings

The accompanying drawings, which 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. In the drawings:

FIG. 1 shows a schematic exploded view of an embodiment of a femoral prosthesis according to the present invention;

FIG. 2 shows a schematic view of the mounting structure of an embodiment of a femoral prosthesis according to the present invention;

fig. 3 shows a schematic view of the structure of the femoral stem body of the femoral prosthesis according to the present invention;

FIG. 4 shows a schematic partial structural view of the femoral stem body of the femoral prosthesis according to the present invention;

FIG. 5 shows a schematic view of the structure of the proximal end of the shank of the femoral prosthesis according to the invention;

fig. 6 shows a schematic structural view of the connection of the femoral prosthesis according to the invention;

fig. 7 shows a schematic structural view of a first embodiment of a spacer of a femoral prosthesis according to the present invention;

fig. 8 shows a schematic structural view of a second embodiment of a spacer of a femoral prosthesis according to the present invention; and

fig. 9 shows a schematic structural view of a third embodiment of a spacer of a femoral prosthesis according to the present invention.

Wherein the above figures include the following reference numerals:

10. a femoral stem body; 11. a first connection hole; 12. a second fastening hole; 20. a proximal end of the handle body; 21. a second connection hole; 22. a locking hole; 30. a connection part; 31. a guide post; 32. locking the vertebrae; 40. a wear ring; 50. a cushion block; 51. a first fastening hole; 52. and a plug hole.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

The present invention provides a femoral prosthesis, please refer to fig. 1-9, comprising a femoral stem body 10 and a stem proximal end 20, the femoral prosthesis further comprising: the connecting part 30, the first end of the connecting part 30 is connected with the femoral stem body 10, the second end of the connecting part 30 is connected with the stem body proximal end 20, so that the femoral stem body 10 and the stem body proximal end 20 are connected through the connecting part 30; wherein the connecting portion 30 is movably disposed on the femoral stem body 10 along a predetermined direction to enable the stem proximal end 20 to move relative to the femoral stem body 10.

The femoral prosthesis of the present invention prevents transmission of force between the femoral stem body 10 and the stem proximal end 20 through the connection part 30, wherein the first end of the connection part 30 is connected with the femoral stem body 10, and the second end of the connection part 30 is connected with the stem proximal end 20, and the stem proximal end 20 can be moved relative to the femoral stem body 10 by movably arranging the connection part 30 on the femoral stem body 10 in a predetermined direction.

In the femoral prosthesis in the prior art, because the femoral stem body 10 and the proximal stem body end 20 are relatively fixedly arranged, the phenomenon that the femoral stem body 10 drags the proximal stem body end 20 to drag a metal acetabulum connected with the proximal stem body end 20 to loosen the proximal stem body end 20 can occur, and the normal recovery of a patient is affected. Compared with the prior art, the proximal end 20 of the shank body is movably arranged corresponding to the proximal end 20 of the shank body through the connecting part 30, so that the transmission of force between the proximal end 20 of the shank body and the shank body 10 is eliminated, and the problem that the inner liner generates tension to the distal end of the femur when the limiting function is provided for the femoral prosthesis in the prior art is solved.

For a particular manner of movement of the proximal handle end 20 relative to the femoral handle body 10, the proximal handle end 20 may be disposed proximally or distally relative to the femoral handle body 10. By providing the proximal stem end 20 either proximally or distally relative to the femoral stem body 10, transmission of force between the femoral stem body 10 and the proximal stem end 20 may be eliminated.

In order to connect the femoral stem body 10 and the connecting portion 30, as shown in fig. 3 and 4, a first connecting hole 11 is provided on the femoral stem body 10, and a first end of the connecting portion 30 is movably inserted into the first connecting hole 11.

In the present embodiment, by providing the femoral stem body 10 with the first connecting hole 11, wherein the first end of the connecting portion 30 is disposed through the first connecting hole 11, in order to achieve that the stem proximal end 20 is disposed close to or away from the femoral stem body 10, the connecting portion 30 is movably disposed through the first connecting hole 11, thereby ensuring that the stem proximal end 20 is movable close to or away from the femoral stem body 10.

Describing the specific structure of the connection portion 30, as shown in fig. 6, the connection portion 30 includes: the guide post 31, the guide post 31 is movably inserted into the first connecting hole 11. By providing the guide post 31 on the connection portion 30, wherein the guide post 31 is adapted to the first connection hole 11, in order to ensure that the guide post 31 is movably inserted into the first connection hole 11, the aperture of the first connection hole 11 is larger than the outer diameter of the guide post 31.

Considering that the guide post 31 is movably penetrated in the first coupling hole 11, various degrees of wear may occur, in order to ensure long-term normal use of the coupling portion 30. As shown in fig. 4, the femoral prosthesis further comprises: the anti-abrasion ring 40, the anti-abrasion ring 40 is arranged in the first connecting hole 11, and the guide post 31 is movably penetrated in the anti-abrasion ring 40.

In the present embodiment, by providing the wear-resistant ring 40 on the femoral prosthesis, wherein the wear-resistant ring 40 is provided in the first connection hole 11, the guide post 31 is penetrated in the wear-resistant ring 40. It is considered that the guide post 31 is not in direct contact with the first connection hole 11, so that the amount of friction therebetween can be eliminated.

In the present embodiment, in order to reduce the amount of friction between the guide post 31 and the wear ring 40. Preferably, the wear ring 40 is a polyethylene ring.

In order to enable the connection between the proximal end 20 of the handle body and the connection portion 30, as shown in fig. 5, a second connection hole 21 is provided in the proximal end 20 of the handle body, and a second end of the connection portion 30 is inserted into the second connection hole 21.

In this embodiment, the connection of the connection portion 30 and the proximal shaft end 20 is achieved by providing a second connection hole 21 in the proximal shaft end 20, wherein the second end of the connection portion 30 is threaded into the second connection hole 21.

In order to enable the second end of the connection portion 30 to be inserted into the second connection hole 21. As shown in fig. 6, the connection part 30 further includes: the locking vertebrae 32, the locking vertebrae 32 are connected with the guide posts 31, and the locking vertebrae 32 are penetrated in the second connection holes 21.

In this embodiment, the connection of the connecting portion 30 to the proximal end 20 of the handle body is achieved by providing a locking taper 32 on the connecting portion 30, wherein the locking taper 32 is connected to the guide post 31 and the locking taper 32 is threaded into the second connecting hole 21.

In this embodiment, the connecting portion 30 is composed of a guide post 31 and a locking vertebra 32, wherein the guide post 31 is movably inserted into the wear-resisting ring 40, and the locking vertebra 32 is inserted into the second connecting hole 21, thereby realizing the relative movement of the proximal end 20 of the stem body with respect to the femoral stem body 10.

To meet the machining requirements, the guide posts 31 are integrally formed with locking vertebrae 32. The guide post 31 and the locking vertebrae 32 are integrally formed, so that the processing efficiency can be ensured, and the structural stability of the connecting portion 30 can be ensured.

In order to limit the positional relationship between the proximal handle body end 20 and the connecting portion 30, the proximal handle body end 20 has a locking hole 22 through which the first fastener passes, as shown in fig. 5, the locking hole 22 communicates with the second connecting hole 21 so that the first fastener passes through the locking hole 22 and is then locked to the connecting portion 30.

By providing the handle proximal end 20 with a locking aperture 22, wherein the locking aperture 22 is provided in a sidewall of the handle proximal end 20, the locking aperture 22 communicates with the second attachment aperture 21. In the specific locking process, the first fastener passes through the locking hole 22 and is in locking connection with the connecting portion 30, so that the limiting effect on the connecting portion 30 is realized, and the connecting portion 30 is ensured to be fixedly arranged in the second connecting hole 21.

In order to eliminate excessive stress from direct contact of the proximal stem end 20 with the femoral stem body 10, the femoral prosthesis further comprises, as shown in fig. 1: spacer 50, spacer 50 is disposed between femoral stem body 10 and stem proximal end 20. Wherein one end surface of the pad 50 is attached to the femoral stem body 10 and the other end surface of the pad 50 is attached to the stem proximal end 20.

By providing a spacer 50 on the femoral prosthesis, wherein the spacer 50 is disposed between the femoral stem body 10 and the stem proximal end 20. In a particular installation procedure, one end face of the spacer 50 is engaged with the femoral stem body 10, and the other end face of the spacer 50 is engaged with the stem proximal end 20, thereby avoiding direct contact between the stem proximal end 20 and the femoral stem body 10. The contact stress between the proximal handle body end 20 and the femoral handle body 10 is somewhat reduced.

In order to be able to stably position the spacer 50 between the proximal stem end 20 and the femoral stem body 10, the relative movement of the proximal stem end 20 and the femoral stem body 10 is not affected. The spacer 50 has a first fastening hole 51 through which the second fastening member passes, and the femoral stem body 10 has a second fastening hole 12 through which the second fastening member passes, the first fastening hole 51 and the second fastening hole 12 being disposed opposite to each other such that the second fastening member passes through the first fastening hole 51 and the second fastening hole 12.

In the present embodiment, by providing the spacer 50 with the first fastening hole 51 through which the second fastening member passes, the femoral stem body 10 has the second fastening hole 12 through which the second fastening member passes, and the first fastening hole 51 and the second fastening hole 12 are disposed opposite to each other. The second fastening member is inserted into the first fastening hole 51 and the second fastening hole 12, so that the spacer 50 is stably coupled to the femoral stem body 10.

Considering that the patient's relative position requirements vary between the proximal stem end 20 and the femoral stem body 10, the first end surface of the spacer 50 is at a predetermined angle to the second end surface of the spacer 50 in order to be able to match the different patient needs.

Considering the spacer 50 disposed between the femoral stem body 10 and the stem proximal end 20, the spacer 50 is provided with a peg hole 52 for allowing the connection portion 30 to pass through the spacer 50. The connecting portion 30 passes through the peg hole 52 to connect the femoral stem body 10 and the stem proximal end 20.

The femoral stem body 10 has a first end face and the stem body proximal end 20 has a second end face, the first and second end faces being disposed opposite one another; wherein, have the first contained angle of predetermineeing between first terminal surface and the second terminal surface, the angle of the first contained angle of predetermineeing is adjustable to be set up.

In order to be able to adapt to a first predetermined angle between the first end face and the second end face, the axis of the guide post 31 is at a second predetermined angle with respect to the axis of the locking cone 32. The inclination direction of the locking vertebrae 32 relative to the guide posts 31 is consistent with the inclination direction of the proximal end 20 of the handle body relative to the femoral handle body 10, so that the guide posts 31 penetrate into the first connecting holes 11, and the locking vertebrae 32 penetrate into the second connecting holes 21; wherein the first preset included angle is equal to the second preset included angle.

In this embodiment, the axis of the guide post 31 and the axis of the locking cone 32 form a second preset included angle, and the inclination direction of the locking cone 32 relative to the guide post 31 is consistent with the inclination direction of the proximal handle body 20 relative to the femoral handle body 10, so that the guide post 31 can be inserted into the first connecting hole 11. The locking vertebra 32 is threaded in the second connecting hole 21, and in order to better achieve a stable connection between the proximal end 20 of the stem body, the connecting portion 30 and the femoral stem body 10, the first predetermined angle is preferably equal to the second predetermined angle.

In this embodiment, the second preset included angle is a, and a is 6 degrees.

For the first embodiment of the spacer 50, as shown in fig. 7, the upper end surface and the lower end surface of the spacer 50 are disposed in parallel, and at this time, the end surfaces of the proximal end 20 of the stem and the femoral stem body 10 disposed opposite to each other are in a parallel state, that is, the connecting axes of the proximal end 20 of the stem and the femoral stem body 10 coincide.

For the second embodiment of the spacer 50, as shown in fig. 8 and 9, the upper and lower end surfaces of the spacer 50 are inclined, and the direction of the inclination may be any direction, which is considered to be required by the patient for the relative positions of the proximal handle body 20 and the femoral handle body 10. The relative inclination of the connecting shaft occurs between the proximal handle body end 20 and the femoral handle body 10. In order to meet the requirements, the spacer 50 disposed between the proximal handle body end 20 and the femoral handle body 10 is also adapted to meet the mounting requirements.

The invention also provides a method for manufacturing the femoral prosthesis, which is used for manufacturing the femoral prosthesis, the femoral prosthesis further comprises a cushion block 50, the cushion block 50 is arranged between the femoral stem body 10 and the proximal stem body 20, so that the proximal stem body 20 is arranged on the femoral stem body 10 through the cushion block 50, and the method comprises the following steps: cushion block matching, namely, cushion blocks 50 are arranged in groups, angles between a first bonding surface and a second bonding surface of each cushion block 50 in a group of cushion blocks 50 are different, and the cushion blocks 50 are selected according to physiological sizes of patients, wherein the angle between the first bonding surface and the second bonding surface of the cushion blocks 50 is adapted to a first preset included angle between a first end surface and a second end surface.

Preferably, the femoral prosthesis further comprises a connecting portion 30, a first end of the connecting portion 30 is connected with the femoral stem body 10, a second end of the connecting portion 30 is connected with the stem proximal end 20, so that the femoral stem body 10 and the stem proximal end 20 are connected through the connecting portion 30, and an axis of the first end of the connecting portion 30 and an axis of the second end of the connecting portion 30 form a second preset included angle, and the manufacturing method comprises: the connecting part selecting step, wherein the connecting parts 30 are arranged in groups, the second preset included angles of the connecting parts 30 in one group of connecting parts 30 are different, the first preset included angle is determined according to the physiological size of the patient, and the connecting parts 30 with the second preset included angles identical to the first preset included angle are selected.

From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. 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 prosthesis comprising a femoral stem body (10) and a stem proximal end (20), characterized in that it further comprises:

a connecting portion (30), a first end of the connecting portion (30) being connected to the femoral stem body (10), a second end of the connecting portion (30) being connected to the stem proximal end (20) such that the femoral stem body (10) and the stem proximal end (20) are connected by the connecting portion (30);

wherein the connecting part (30) is movably arranged on the femoral stem body (10) along a preset direction so as to enable the proximal end (20) of the stem body to move relative to the femoral stem body (10);

the femoral stem body (10) is provided with a first connecting hole (11), and the first end of the connecting part (30) is movably arranged in the first connecting hole (11) in a penetrating way;

a second connecting hole (21) is formed in the proximal end (20) of the handle body, and the second end of the connecting part (30) is arranged in the second connecting hole (21) in a penetrating manner;

the femoral prosthesis further comprises: the femoral stem comprises a cushion block (50), wherein the cushion block (50) is arranged between the femoral stem body (10) and the proximal end (20) of the stem body, one end face of the cushion block (50) is attached to the femoral stem body (10), and the other end face of the cushion block (50) is attached to the proximal end (20) of the stem body.

2. Femoral prosthesis according to claim 1, wherein the stem proximal end (20) is proximally or distally arranged relative to the femoral stem body (10).

3. The femoral prosthesis according to claim 1, wherein the connecting portion (30) comprises:

and the guide column (31) is movably penetrated in the first connecting hole (11).

4. The femoral prosthesis of claim 3, further comprising:

and the abrasion-resistant ring (40), the abrasion-resistant ring (40) is arranged in the first connecting hole (11), and the guide column (31) is movably penetrated in the abrasion-resistant ring (40).

5. A femoral prosthesis according to claim 3, wherein the connecting portion (30) further comprises:

the locking vertebrae (32) are connected with the guide posts (31), and the locking vertebrae (32) penetrate through the second connecting holes (21).

6. Femoral prosthesis according to claim 5, wherein the guide post (31) is integrally formed with the locking cone (32).

7. The femoral prosthesis according to claim 1, wherein the proximal end (20) of the stem body has a locking aperture (22) for the passage of a first fastener, the locking aperture (22) being in communication with the second attachment aperture (21) such that the first fastener is in locking engagement with the attachment portion (30) after passage through the locking aperture (22).

8. The femoral prosthesis according to claim 1, wherein the spacer (50) has a first fastening hole (51) through which a second fastening member passes, the femoral stem body (10) has a second fastening hole (12) through which the second fastening member passes, the first fastening hole (51) and the second fastening hole (12) being disposed opposite to each other such that the second fastening member passes within the first fastening hole (51) and the second fastening hole (12).

9. The femoral prosthesis according to claim 1, wherein the first end face of the spacer (50) is at a predetermined angle to the second end face of the spacer (50).