CN215307050U

CN215307050U - Radius capitulum prosthesis

Info

Publication number: CN215307050U
Application number: CN202121846769.7U
Authority: CN
Inventors: 王熙泽; 史春宝; 郭静; 朱更博; 王峥
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2021-08-09
Filing date: 2021-08-09
Publication date: 2021-12-28
Anticipated expiration: 2031-08-09

Abstract

The utility model provides a small radius head prosthesis, comprising: the small radius head comprises a small radius head body, a radius handle and a screw, wherein the small radius head body is clamped at the top end of the radius handle and then connected with the screw. The advantages are that: compared with the traditional press-fit type small radius head prosthesis, the threaded type small radius head prosthesis adopts a threaded compression mode, so that the stability is stronger, and the small radius heads of different models can be replaced to adapt to different osteotomy lengths without pulling out a radius handle.

Description

Radius capitulum prosthesis

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a small radius head prosthesis.

Background

Fractures of the small radius are common in elbow fractures, and the small radius is resected to cause the following problems: instability of elbow joint, increase of carrying angle, ulnar nerve symptom, recurrent dislocation of elbow joint, reduced motion range, osteoarthritis and ectopic ossification. The small head of the radius can be replaced generally, and the integrity of the head and the neck of the radius can be recovered anatomically, so that the mechanical unbalance of the elbow joint after the head of the radius is cut off is solved, and the stability of reconstructing the elbow joint is achieved; maintains the stability of the ulnar and ulnar joints and reconstructs the axial stability of the forearm, thereby preventing the radial upward movement and the accompanying wrist symptoms

However, the existing radius capitulum prosthesis is a taper hole press-fit prosthesis, and is required to be implanted into a human body after being assembled in vitro, and if the models are not matched, the prosthesis is required to be withdrawn and then the models are replaced, so that the assembly can be carried out, the operation time is prolonged, the experience of a patient in the operation is reduced, and the treatment effect is reduced.

SUMMERY OF THE UTILITY MODEL

The present invention provides a capitulum radii prosthesis, aiming at overcoming at least one of the technical drawbacks mentioned above.

In order to realize the purpose of the utility model, the utility model provides the following technical scheme:

a capitulum radius prosthesis, comprising: the small radius head comprises a small radius head body, a radius handle and a screw, wherein the small radius head body is clamped at the top end of the radius handle and then connected with the screw.

Preferably, a first threaded hole for the screw to pass through and a clamping groove with a T-shaped longitudinal section communicated with the first threaded hole are formed in the small radius head body.

Further, the radius handle includes the supporting part and locates on the supporting part top face and with the card of draw-in groove adaptation establishes the portion, establish the portion and seted up with screw threaded connection's No. two screw holes on the card, make the screw simultaneously threaded connection in proper order No. one screw hole, No. two screw holes in order to with radius capitulum body radius handle fixed connection.

Furthermore, the supporting part is composed of a supporting handle and a bearing block vertically connected to the top end of the supporting handle.

Furthermore, the longitudinal section of the clamping part is in a T shape, and the edge of the short side of the T shape, which is clamped with the clamping groove, is in an arc shape.

Furthermore, the first threaded hole in the small radius head body and the second threaded hole in the clamping part are coaxial.

Preferably, the transverse surfaces of the upper end surface and the lower end surface of the small radius head body are circular.

Preferably, the first threaded hole and the clamping groove are formed along the width direction of the small head of radius body.

The utility model relates to a small radius head prosthesis, which has the advantages that: compared with the traditional press-fit type small radius head prosthesis, the threaded type small radius head prosthesis adopts a threaded compression mode, so that the stability is stronger, and the small radius heads of different models can be replaced to adapt to different osteotomy lengths without pulling out a radius handle.

Drawings

The accompanying drawings are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model. In the drawings:

fig. 1 and fig. 2 are schematic perspective views of a radial capitulum prosthesis according to the present invention from different perspectives, respectively;

FIG. 3 is a schematic view of the connection structure of the small radius head body and the screw;

FIG. 4 is a partial schematic view of the radial stem in connection with a screw;

fig. 5 and 6 are schematic perspective views of the radial capitulum body from different viewing angles, respectively;

FIG. 7 is a perspective view of a radial stem;

wherein:

1-a small radius head body, 11-a first threaded hole, 12-a clamping groove, 13-a receiving hole, 2-a radius handle, 21-a supporting part, 21 a-a supporting handle, 21 b-a bearing block, 22-a clamping part, 22 a-a second threaded hole and 3-a screw.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

In order to select a proper capitulum radius body according to actual conditions in the installation process, the utility model provides a capitulum radius prosthesis according to the drawings of fig. 1 and 2, which comprises: the head of the small radius comprises a small radius head body 1, a radius handle 2 and a screw 3, wherein the small radius head body 1 is clamped at the top end of the radius handle 2 and then connected through the screw 3; after the radius handle 2 is installed on an affected part, the radius capitulum body 1 is clamped on the radius handle 2, whether the specification of the selected radius capitulum body 1 is proper or not is checked, if not, the proper radius capitulum body 1 can be selected, and finally the radius capitulum body 1 and the radius handle 2 are connected and fixed in a threaded mode through the screw 3; the thread compression mode has stronger stability, and the small radius head body 1 with different types can be replaced to adapt to different osteotomy lengths under the condition of not pulling out the radius handle 2, thereby improving the treatment effect of the small radius joint replacement.

In a specific embodiment, as shown in fig. 3, 5, and 6, in order to facilitate connection between the small radius head body 1 and the radius handle 2, a first threaded hole 11 for the screw 3 to pass through and a T-shaped slot 12 in a longitudinal cross section communicated with the first threaded hole 11 are formed in the small radius head body 1, so that when the small radius head body 1 and the radius handle 2 are connected, the slot 12 on the small radius head body 1 is specifically engaged with the radius handle 2, and then the screw 3 is used for connection, which is fast, effective, and time-saving;

furthermore, the first threaded hole 11 and the clamping groove 12 are both formed along the width direction of the small radius head body 1, so that the small radius head body 1 and the radius handle 2 can be conveniently connected and fixed;

furthermore, a containing hole 13 which is coaxial with the first threaded hole 11 and used for containing a nail cap of the screw 3 is formed in the small radius head body 1, so that after the screw 3 is connected with the small radius head body 1 and the radius handle 2, the nail cap is located in the containing hole 13, and damage to an affected part is reduced.

In a specific embodiment, in order to facilitate implantation of the radius handle 2, as shown in fig. 4 and 7, the radius handle 2 includes a supporting portion 21 and a clamping portion 22 disposed on a top end surface of the supporting portion 21 and adapted to the clamping groove 12, in order to improve stability of connection between the small radius head body 1 and the radius handle 2, a second threaded hole 22a in threaded connection with the screw 3 is formed in the clamping portion 22, so that the screw 3 is simultaneously in threaded connection with the first threaded hole 11 and the second threaded hole 22a to fixedly connect the small radius head body 1 and the radius handle 2; for the stability of the connection between the small radius head body 1 and the radius handle 2, the first threaded hole 11 on the small radius head body 1 and the second threaded hole 22a on the clamping part 22 are coaxial;

in a specific implementation process, as shown in fig. 4, the insertion end of the screw 3 abuts against the inside of the clamping portion 22, and the clamping groove 12 on the small radius head body 1 slides in the transverse direction to be clamped into the clamping portion 22.

More specifically, in order to improve the supporting force and facilitate the implantation, as shown in fig. 7, the supporting portion 21 is composed of a supporting handle 21a and a receiving block 21b vertically connected to the top end of the supporting handle 21a, the engaging portion 22 is located on the receiving block 21b, and the supporting portion 21, the receiving block 21b and the engaging portion 22 are integrally formed; further, in order to make the matching degree of the clamping portion 22 and the clamping portion 22 high and reduce the damage to the affected part, the longitudinal section of the clamping portion 22 is configured to be T-shaped, and the edge of the short side of the T-shaped, which is clamped with the clamping groove 12, is arc-shaped.

In a specific embodiment, in order to make the structure of the utility model better fit with an affected part, the transverse planes of the upper end surface and the lower end surface of the small radius head body 1 are circular; the cross section of the bearing block 21b is circular, so that the small radius head body 1 is attached to the radius handle 2;

in a specific implementation process, for the connection stability of the small radius head body 1 and the radius handle 2, the size of the cross section of the receiving block 21b is preferably equal to the circular size of the contact surface of the small radius head body 1.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A capitulum radius prosthesis, comprising: the bone fracture plate comprises a small radius head body (1), a radius handle (2) and a screw (3), wherein the small radius head body (1) is clamped on the top end of the radius handle (2) and then connected through the screw (3).

2. The capitulum radius prosthesis of claim 1, wherein: the small radius head body (1) is provided with a first threaded hole (11) for the screw (3) to pass through, and a clamping groove (12) with a T-shaped longitudinal section communicated with the first threaded hole (11).

3. The capitulum radius prosthesis of claim 2, wherein: the radius handle (2) include supporting part (21) and locate the top of supporting part (21) face and with portion (22) are established to the card of draw-in groove (12) adaptation, the card establish portion (22) on seted up with screw (3) threaded connection's No. two screw holes (22a), make screw (3) threaded connection simultaneously No. one screw hole (11) No. two screw holes (22a) are in order to with radius capitulum body (1) radius handle (2) fixed connection.

4. The capitulum radius prosthesis of claim 3, wherein: the support part (21) is composed of a support handle (21a) and a bearing block (21b) vertically connected with the top end of the support handle (21 a).

5. The capitulum radius prosthesis of claim 3, wherein: the longitudinal section of the clamping part (22) is in a T shape, and the edge of the short side of the T shape, which is clamped with the clamping groove (12), is in an arc shape.

6. The capitulum radius prosthesis of claim 5, wherein: the first threaded hole (11) in the small head radius body (1) and the second threaded hole (22a) in the clamping portion (22) are coaxial.

7. The capitulum radius prosthesis of claim 2, wherein: the transverse surfaces of the upper end surface and the lower end surface of the small radius head body (1) are circular.

8. The capitulum radius prosthesis of claim 6, wherein: the first threaded hole (11) and the clamping groove (12) are formed along the width direction of the small head of radius body (1).