CN213851268U

CN213851268U - Shoulder joint prosthesis for surface replacement

Info

Publication number: CN213851268U
Application number: CN202022611087.XU
Authority: CN
Inventors: 朱更博; 史春宝; 郭静; 付中国
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2020-11-12
Filing date: 2020-11-12
Publication date: 2021-08-03
Anticipated expiration: 2030-11-12

Abstract

A shoulder prosthesis for resurfacing comprising: the humerus head prosthesis comprises a humerus head prosthesis covering the surface of the proximal humerus, a broach prosthesis implanted in the medullary cavity of the proximal humerus, and a hollow screw penetrating through the broach prosthesis and connected with the humerus head prosthesis, wherein the broach prosthesis is in a spiral cage structure. The advantages are that: by adopting the spiral cage structure, the early-stage spiral is screwed into the medullary cavity, the contact area with cortex lycii is larger, and the early-stage spiral is more stable; and a small amount of broken bones can be implanted during the operation, so that the later-stage bone ingrowth is facilitated, and the later-stage stability is improved.

Description

Shoulder joint prosthesis for surface replacement

Technical Field

The utility model belongs to the technical field of medical instrument technique and specifically relates to a shoulder joint false body for surface replacement.

Background

In the existing surface shoulder joint prosthesis, a bone cement type broach is suitable for patients with osteoporosis, and a biological type broach is suitable for patients with good bone, but as an initial replacement operation, the bone cement type prosthesis is not suitable, and bone cement in a medullary cavity is not easy to clean in a revision operation; and after the biological broach is implanted into a medullary cavity, the proximal humerus cortical bone layer can be firmly combined with titanium powder, but the growing effect of the lower cancellous bone titanium powder is not good, the lower layer is basically in a hollow state, and the later stability is only contacted by the proximal cortical bone layer.

SUMMERY OF THE UTILITY MODEL

The utility model provides a shoulder joint prosthesis for surface replacement, which aims to overcome the technical defects and ensure that the prosthesis is firmly implanted and is not easy to fall off.

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

a shoulder joint prosthesis for surface replacement comprises a humerus head prosthesis covering the surface of the proximal humerus, a broach prosthesis implanted in the medullary cavity of the proximal humerus, and a hollow screw penetrating through the broach prosthesis and connected with the humerus head prosthesis, wherein the broach prosthesis is in a spiral cage structure.

Preferably, a conical column is formed on the inner surface of the humeral head prosthesis, an inner threaded hole with a downward opening is formed at the bottom of the conical column, and a first outer threaded section in threaded fit with the inner threaded hole is formed on the hollow screw.

Preferably, the broach prosthesis comprises a conical matching section with a conical hole at the upper part and a hollow spiral section which is integrally formed with the conical matching section, and the broach prosthesis is connected with the humeral head prosthesis in a conical matching manner by inserting the conical column into the conical hole of the conical matching section.

Preferably, an internal thread section is further formed in the conical section and is positioned below the conical hole; and a second external thread section in threaded connection with the internal thread section is formed on the hollow screw.

Preferably, the hollow helical section is exposed below the inferior plane of the humeral head prosthesis.

Preferably, the lower part of the hollow screw is exposed out of the hollow spiral section.

Preferably, a receiving cavity is formed between the outer surface of the cannulated screw and the inner surface of the cannulated screw in the cannulated spiral section, and an opening is formed at the lower part of the cannulated spiral section, so that the crushed bone is implanted into the receiving cavity through the opening.

The utility model discloses a shoulder joint prosthesis for surface replacement, its advantage is:

1. the broach prosthesis of the utility model adopts a spiral cage structure, namely, the outer part is spiral and the inner part is a hollow cage structure, so that the early-stage spiral is screwed into a medullary cavity, the contact area with cortical bone is larger, and the early-stage spiral is more stable;

2. the broach prosthesis of the utility model adopts a spiral cage structure, a small amount of broken bones can be implanted during the operation, which is helpful for the later bone to grow in and improves the later stability;

3. the hollow screw has the structural design that the hollow screw is in threaded connection with the humerus head prosthesis through the broach prosthesis, so that the humerus head prosthesis is firmly pressed on the surface of the proximal end of the humerus, and the falling risk of the humerus head is reduced;

4. the utility model discloses the structural design of awl joining in marriage section and internal awl post etc. of humerus head false body in the well broach false body has improved the stability of broach false body and humerus head false body.

Drawings

The accompanying drawings 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 principles of the invention. In the drawings:

FIG. 1 is a schematic cross-sectional view of a shoulder joint prosthesis for resurfacing of the present invention;

FIG. 2 is a schematic cross-sectional view of the broach prosthesis according to the present invention;

FIG. 3 is a schematic structural view of the hollow screw of the present invention;

fig. 4 is a schematic structural view of the humerus prosthesis of the present invention;

wherein:

humeral head prosthesis 1, conical column 11, internal threaded hole 12;

the broach prosthesis 2, a taper hole 21, a taper section 22, a hollow spiral section 23, an internal thread section 24, an accommodating cavity 25 and an opening 26;

a cannulated screw 3, a first external thread section 31, said second external thread section 32.

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 presented herein only to illustrate and explain the present invention, and not to limit the present invention.

According to fig. 1, a shoulder joint prosthesis for resurfacing is shown, a humeral head prosthesis 1 covering the proximal humerus surface, a broach prosthesis 2 implanted in the medullary cavity of the proximal humerus, a cannulated screw 3 penetrating the broach prosthesis 2 and then connected to the humeral head prosthesis 1, wherein the broach prosthesis 2 has a spiral cage structure.

The utility model discloses a shoulder joint prosthesis when using, according to the corresponding specification of patient's humerus head size selection humerus head prosthesis 1 with broach prosthesis 2, will hollow screw 3 pierces through behind the broach prosthesis 2 with 1 threaded connection of humerus head prosthesis, will again broach prosthesis 2 aims at the hole of opening in advance on human humerus head surface, and right humerus head prosthesis 1 applys external force, broach prosthesis 2 deepens gradually in this is downthehole, at this in-process, because reverse tension that hollow screw 3 provided will humerus head prosthesis 1 firmly compresses tightly at human humerus proximal end surface, has reduced the risk that shoulder joint prosthesis drops.

It should be noted that, as shown in fig. 1, fig. 3 and fig. 4, in order to detach the humeral head prosthesis 1 from the broach prosthesis 2, a conical column 11 is formed on the inner surface of the humeral head prosthesis 1, an inner threaded hole 12 with a downward opening 26 is formed at the bottom of the conical column 11, and a first outer threaded section 31 in threaded fit with the inner threaded hole 12 is formed on the hollow screw 3, so that the present invention can select the specifications of the humeral head prosthesis 1 and the broach prosthesis 2 suitable for patients according to the sizes of the humeral heads of different patients, and thus the present invention has applicability;

in the embodiment shown in fig. 1 and 2, the broach prosthesis 2 includes a tapered section 22 with a tapered hole 21 at the upper part thereof, and a hollow spiral section 23 integrally formed with the tapered section 22, and the broach prosthesis 2 is tapered and connected with the humeral head prosthesis 1 by inserting the tapered column 11 into the tapered hole 21 of the tapered section 22, so as to further improve the stability of the broach prosthesis 2 and the humeral head prosthesis 1.

As shown in fig. 1 to 4, in order to achieve stability of mutual fitting among the broach prosthesis 2, the humeral head prosthesis 1, and the cannulated screw 3, an internally threaded section 24 is further formed in the tapered section 22, and the internally threaded section 24 is located below the tapered hole 21; a second external thread section 32 in threaded connection with the internal thread section 24 is formed on the hollow screw 3, so that the upper part of the hollow screw 3 is in threaded connection with the internal thread hole 12 in the humeral head prosthesis 1 and the internal thread section 24 in the intramedullary nail prosthesis 2 in sequence through the first external thread section 31 and the second external thread section 32, the humeral head prosthesis 1 is in tapered fit connection with the tapered fit section 22 of the intramedullary nail prosthesis 2 through the tapered column 11, and the falling-off risk caused by pure taper connection failure is reduced;

the transverse length of the second external thread section 32 is greater than that of the first external thread section 31 and less than that of the bottom of the conical column 11, so that the humeral head prosthesis 1 is further attached to the proximal humeral surface under the action of the reaction force of the hollow screw 3, and the stability of the prosthesis is improved; the first external thread section 31 and the second external thread section 32 share a vertical center line.

As shown in fig. 1, the hollow helical section 23 is exposed below the bottom edge of the humeral head prosthesis 1, improving the stability of the connection of the humeral head prosthesis 1 and the broach prosthesis 2.

As shown in fig. 1, the lower portion of the cannulated screw 3 is exposed out of the cannulated helical section 23, which facilitates the operation during the operation.

In the embodiment shown in fig. 1, a receiving cavity 25 is formed between the outer surface of the cannulated screw 3 in the cannulated spiral section 23 and the inner surface of the cannulated spiral section 23, and an opening 26 is formed at the lower part of the cannulated spiral section 23, so that fractured bone is implanted into the receiving cavity 25 through the opening 26, which facilitates late bone ingrowth and promotes late stability.

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

Claims

1. A shoulder joint prosthesis for resurfacing, characterized by: the humerus head prosthesis comprises a humerus head prosthesis (1) covering the surface of the proximal humerus, a medullary needle prosthesis (2) implanted in the medullary cavity of the proximal humerus, and a hollow screw (3) penetrating through the medullary needle prosthesis (2) and connected with the humerus head prosthesis (1), wherein the medullary needle prosthesis (2) is of a spiral cage structure.

2. A shoulder joint prosthesis for resurfacing, as claimed in claim 1, wherein: the internal surface of the humerus head prosthesis (1) is provided with a conical column (11), the bottom of the conical column (11) is provided with an internal thread hole (12) with a downward opening, and a first external thread section (31) in threaded fit with the internal thread hole (12) is formed on the hollow screw (3).

3. A shoulder joint prosthesis for resurfacing, as claimed in claim 2, wherein: the broach prosthesis (2) comprises a conical matching section (22) with a conical hole (21) formed in the upper portion and a hollow spiral section (23) integrally formed with the conical matching section (22), and the broach prosthesis (2) is connected with the humeral head prosthesis (1) in a conical matching mode by inserting the conical column (11) into the conical hole (21) of the conical matching section (22).

4. A shoulder joint prosthesis for resurfacing, as claimed in claim 3, wherein: an internal thread section (24) is further formed in the conical section (22), and the internal thread section (24) is located below the conical hole (21); and a second external thread section (32) in threaded connection with the internal thread section (24) is formed on the hollow screw (3).

5. A shoulder joint prosthesis for resurfacing, as claimed in claim 3, wherein: the hollow helical section (23) is exposed below the lower plane of the humeral head prosthesis (1).

6. A shoulder joint prosthesis for resurfacing, as claimed in claim 3, wherein: the lower part of the hollow screw (3) is exposed out of the hollow spiral section (23).

7. A shoulder joint prosthesis for resurfacing, as claimed in claim 3, wherein: a containing cavity (25) is formed between the outer surface of the hollow screw (3) in the hollow spiral section (23) and the inner surface of the hollow screw, and an opening (26) is formed at the lower part of the hollow spiral section (23), so that broken bones are implanted into the containing cavity (25) through the opening (26).