CN112674911B

CN112674911B - Humerus prosthesis

Info

Publication number: CN112674911B
Application number: CN202011624476.4A
Authority: CN
Inventors: 王彩梅
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2022-04-19
Anticipated expiration: 2040-12-30
Also published as: CN112674911A

Abstract

The invention provides a humerus prosthesis. The humerus prosthesis comprises a humerus head cap body which comprises a spherical outer wall surface and an inner wall surface positioned in the spherical outer wall surface, wherein the inner wall surface comprises a top wall and an annular side wall connected with the top wall; the intramedullary column is connected with the humeral head cap body, and the top of the intramedullary column is positioned in the humeral head cap body; wherein, a conical surface matching structure is arranged between the annular side wall and the intramedullary column, and the cap body of the humeral head is connected with the intramedullary column through the conical surface matching structure. The technical scheme of the invention effectively solves the problem that the artificial shoulder joint prosthesis with the handle is easy to injure patients when used for treatment in the related technology.

Description

Humerus prosthesis

Technical Field

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

Background

Scapulohumeral periarthritis, commonly called congealing shoulder and fifty shoulder. Periarthritis of shoulder is a common disease with pain and difficulty in movement of shoulder joints as main symptoms. The high incidence of this disease is about 50 years old, and the incidence of female disease is slightly higher than that of male disease, which is often seen in physical workers. If no effective treatment is available, the functional activity of the shoulder joint may be seriously affected. The shoulder joints may have extensive tenderness and radiate towards the neck and elbows, and there may also be different degrees of atrophy of the deltoid muscles.

The treatment scheme for scapulohumeral periarthritis in the related technology is as follows: with artificial shoulder joint prostheses with a stem, the humeral head needs to be resected and the long humeral stem inserted into the medullary cavity to fix the entire prosthesis. The above treatment may result in excessive bone resection and injury to the patient when the cartilage at the local humeral head is necrotic.

Disclosure of Invention

The invention mainly aims to provide a humerus prosthesis, which aims to solve the problem that when an artificial shoulder joint prosthesis with a handle is used for treatment in the related art, a patient is easily injured.

In order to achieve the above object, the present invention provides a humeral prosthesis comprising: a humeral head cap comprising a spherical outer wall surface and an inner wall surface located within the spherical outer wall surface, the inner wall surface comprising a top wall and an annular side wall connected to the top wall; the intramedullary column is connected with the humeral head cap body, and the top of the intramedullary column is positioned in the humeral head cap body; wherein, a conical surface matching structure is arranged between the annular side wall and the intramedullary column, and the cap body of the humeral head is connected with the intramedullary column through the conical surface matching structure.

Furthermore, the intramedullary rod comprises a cover body structure and a cylinder body arranged in the cover body structure, the outer surface of the cover body structure is attached to the annular side wall to form a conical surface matching structure, and the outer contour of the cover body structure is in a circular truncated cone shape.

Further, a connection structure is further arranged between the humeral head cap body and the intramedullary rod, and the connection structure comprises: the circular truncated cone structure is arranged on the top wall, and the diameter of the circular truncated cone structure is gradually reduced along the direction far away from the top wall; the mounting hole is formed in the column body, and the circular truncated cone structure is inserted into the mounting hole; wherein, there is the distance between round platform structure and the mounting hole.

Furthermore, a first connecting hole is formed in the column body and communicated with the mounting hole.

Furthermore, the cylinder is further provided with an inner hole communicated with the mounting hole, the inner hole is arranged along the axis direction of the cylinder, a stopping step is formed between the inner hole and the mounting hole, the humerus prosthesis further comprises a stud penetrating out of the intramedullary cylinder, the stud comprises a connector and a first thread section, the first thread section is in threaded connection with the inner hole, and the stopping step is in stopping fit with the connector.

Further, the stud further comprises a second connecting hole, and the second connecting hole penetrates through the radial direction of the stud and is located below the first threaded section.

Furthermore, the second connecting holes are multiple, and the second connecting holes are arranged at intervals in the axial direction of the stud.

Further, the stud further comprises a second thread section, the second thread section is located below the first thread section, and the thread pitch of the first thread section is larger than that of the second thread section.

Furthermore, the stud is of a hollow structure, and the hollow structure is filled with adhesive.

Further, the intramedullary rod further comprises a plurality of fins which are arranged at intervals in the circumferential direction of the rod body, the fins are connected between the rod body and the inner surface of the cover body structure, and the outer surfaces of the fins are provided with porous coatings.

By applying the technical scheme of the invention, the humerus prosthesis comprises a humerus head cap body and an intramedullary column. When local cartilage of the humerus head is necrotic, only the bone at the necrotic position needs to be removed, and the humerus head cap body and the intramedullary column which are matched with the humerus head of a patient in size are selected for replacement. The cap body of the humerus head is provided with a spherical outer wall surface which is matched with the glenoid, so that the humerus head can flexibly rotate in the glenoid. The inner wall surface of the humeral head cap body comprises a top wall and an annular side wall connected with the top wall, and the intramedullary rod and the annular side wall form a conical surface matching structure. When the cap body of the humeral head and the intramedullary column are assembled, the conical surface matching structure can play a role in guiding, so that the installation is simple and convenient. After the humerus prosthesis is implanted, the conical surface matching structure can also effectively support the cap body of the humeral head. Meanwhile, the arrangement of the intramedullary column increases the contact area between the humeral prosthesis and the humeral head of a patient, so that the connection is firmer and more reliable. The technical scheme of the invention effectively solves the problem that the artificial shoulder joint prosthesis with the handle is easy to injure patients when used for treatment in the related technology.

Drawings

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

fig. 1 shows a schematic perspective view of an embodiment of a humeral prosthesis according to the present invention;

fig. 2 shows a schematic cross-sectional view of the humeral prosthesis of fig. 1;

fig. 3 shows a cross-sectional schematic view of another location of the humeral prosthesis of fig. 1;

fig. 4 shows a schematic perspective view of the humeral head cap and intramedullary stem of the humeral prosthesis of fig. 1;

fig. 5 shows a cross-sectional schematic view of the humeral head cap and intramedullary stem of fig. 4;

fig. 6 shows a schematic perspective view of an intramedullary post of the humeral prosthesis of fig. 1;

FIG. 7 shows a cross-sectional schematic view of the intramedullary rod of FIG. 6;

fig. 8 shows a schematic perspective view of a humeral head cap of the humeral prosthesis of fig. 1;

fig. 9 shows a cross-sectional schematic view of the humeral head cap of fig. 8;

fig. 10 shows a perspective view of a stud of the humeral prosthesis of fig. 1; and

FIG. 11 shows a schematic cross-sectional view of the stud of FIG. 10.

Wherein the figures include the following reference numerals:

10. a humeral head cap; 11. a spherical outer wall surface; 12. an annular sidewall; 13. a circular truncated cone structure; 14. a top wall; 20. an intramedullary rod; 21. a cover body structure; 22. a cylinder; 23. mounting holes; 24. a first connection hole; 25. an inner bore; 26. a fin; 27. a stopping step; 30. a stud; 31. a first thread segment; 32. a connector; 33. a second connection hole; 34. a second thread segment.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

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.

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.

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 unless specifically stated otherwise. 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.

As shown in fig. 1, 4 and 5, the humeral prosthesis of the present embodiment includes: a humeral head cap 10 and an intramedullary rod 20. The humeral head cap 10 includes a spherical outer wall surface 11 and an inner wall surface within the spherical outer wall surface 11, the inner wall surface including a top wall 14 and an annular side wall 12 connected to the top wall 14. An intramedullary post 20 is attached to the humeral head cap 10, with the top of the intramedullary post 20 positioned within the humeral head cap 10. Wherein, a conical surface matching structure is arranged between the annular side wall 12 and the intramedullary rod 20, and the humeral head cap body 10 and the intramedullary rod 20 are connected through the conical surface matching structure.

Using the solution of the present embodiment, the humeral prosthesis comprises a humeral head cap 10 and an intramedullary rod 20. When local cartilage of the humeral head is necrotic, only bone at the necrotic position needs to be removed, and the humeral head cap 10 and the intramedullary rod 20 which are matched with the humeral head of a patient in size are selected for replacement. The humeral head cap 10 has a spherical outer wall surface 11, and the spherical outer wall surface 11 is fitted to the glenoid cavity so that the humeral head can rotate flexibly in the glenoid cavity. The inner wall surface of the humeral head cap 10 includes a top wall 14 and an annular side wall 12 connected to the top wall 14, and an intramedullary rod 20 and the annular side wall 12 form a taper fit. When the humeral head cap 10 and the intramedullary rod 20 are assembled, the conical surface matching structure can play a role in guiding, so that the installation is simple and convenient. The above described conical surface fit structure also enables effective support of the humeral head cap 10 after implantation of the humeral prosthesis. Meanwhile, the arrangement of the intramedullary rod 20 increases the contact area between the humeral prosthesis and the humeral head of the patient, so that the connection is firmer and more reliable. The technical scheme of the embodiment effectively solves the problem that the artificial shoulder joint prosthesis with the handle is easy to injure a patient when used for treatment in the related technology.

As shown in fig. 6 and 7, the intramedullary rod 20 includes a cover structure 21 and a column 22 disposed in the cover structure 21, an outer surface of the cover structure 21 is attached to the annular sidewall 12 to form a conical surface fitting structure, and an outer contour of the cover structure 21 is a truncated cone. The outer surface of the cover structure 21 is attached to the annular sidewall 12 to form a conical surface mating structure. The conical surface matching structure can play a role in guiding, so that the installation is simple and convenient; while supporting the humeral head cap 10. The cover structure 21 includes an annular plate extending in the horizontal direction and a frustum-shaped cylinder extending downward from the outer edge of the annular plate. The column 22 is connected to the inner edge of the annular plate. The annular plate is capable of supporting the top wall 14 of the humeral head cap 10.

As shown in fig. 6 and 7, the column 22 is provided with a first connection hole 24, and the first connection hole 24 is communicated with the mounting hole 23. During the humeral prosthesis implantation process, the intramedullary rod 20 is fixed, and an adhesive may be injected into the mounting hole 23 and the first connection hole 24 to achieve adhesion of the intramedullary rod 20 to the humeral head of the patient. The adhesive is specifically bone cement or self-setting artificial bone, and the adhesive can combine the intramedullary rod 20 with external bone (i.e. bone of humeral head of patient) to realize the integration of internal and external bones. The first coupling hole 24 may extend in a radial direction of the cylinder 22.

Further, the inner surface of the mounting hole 23 is provided with a coating, and after the adhesive is injected into the mounting hole 23 and connected with the humeral head cap 10, the coating can play a biological binding role to promote the integration of the whole humeral prosthesis and the humeral head of the patient.

As shown in fig. 4, 5, 8 and 9, a connection structure is further provided between the humeral head cap 10 and the intramedullary rod 20, the connection structure including: a truncated cone structure 13 and a mounting hole 23. The round platform structure 13 is arranged on the top wall 14, and the diameter of the round platform structure 13 is gradually reduced along the direction far away from the top wall 14. A mounting hole 23 is provided on the column 22, and the circular truncated cone structure 13 is inserted in the mounting hole 23. Wherein, a distance is reserved between the circular truncated cone structure 13 and the mounting hole 23. The diameter of the mounting hole 23 is gradually reduced in a direction away from the humeral head cap 10 with a distance from the circular truncated cone structure 13. After the intramedullary rod 20 is installed, the circular truncated cone structure 13 is installed into the installation hole 23 during the assembly of the humeral head cap 10 to the intramedullary rod 20. The connection between the cone structure 13 and the intramedullary rod 20 can be realized by adhesive. Meanwhile, the adhesive in the mounting hole 23 is extruded in the mounting process of the circular truncated cone structure 13, so that a pressurizing effect is achieved, and the connection between the intramedullary rod 20 and the humeral head of the patient is firmer.

As shown in fig. 2, 3, 7 and 8, the cylinder 22 is further provided with an inner hole 25 communicated with the mounting hole 23, the inner hole 25 is arranged along the axial direction of the cylinder 22, a stopping step 27 is formed between the inner hole 25 and the mounting hole 23, the humerus prosthesis further includes a stud 30 penetrating through the intramedullary rod 20, the stud 30 includes a connector 32 and a first thread section 31, the first thread section 31 is in threaded connection with the inner hole 25, and the stopping step 27 is in stopping fit with the connector 32. The stud 30 can be extended to a desired position to transmit the stress to a desired location, and extended to a fixed length. The mounting hole 23 is communicated with the inner hole 25, when the humerus prosthesis is mounted, the stud 30 is inserted into the intramedullary rod 20 from above, the connector 32 is clamped on the stopping step 27 and cannot move downwards continuously, and the first thread section 31 is in threaded connection with the inner hole 25 to realize the connection of the stud 30 and the intramedullary rod 20. The structure is simple to process and reliable in connection.

As shown in fig. 10 and 11, the stud 30 further includes a second thread section 34, the second thread section 34 being located below the first thread section 31, the pitch of the first thread section 31 being greater than the pitch of the second thread section 34. The first thread section 31 and the mounting hole 23 are screwed to achieve the fixed connection of the intramedullary rod 20 and the stud 30. The assembly is simple, the rapid implantation can be realized, and the operation efficiency is improved. The second thread section 34 is provided with cancellous bone threads, and the thread pitch of the threads is wide, so that the fixation of the humeral prosthesis to bone can be realized. The cancellous bone screw thread can realize compaction and compaction of the bone, and increase the strength and the supporting force of the bone.

As shown in fig. 10 and 11, the stud 30 has a hollow structure, and the hollow structure is filled with an adhesive. The stud 30 further comprises a second connection hole 33, and the second connection hole 33 penetrates through the radial direction of the stud 30 and is positioned below the first threaded section 31. During installation, an adhesive is injected into the hollow structure, and the adhesive flows into the second connection hole 33 to be connected with the humeral head of the patient. The spongy bone thread and the adhesive act together to realize the integration of the inner bone and the outer bone, so that the connection is more stable and reliable. The adhesive is bone cement or self-setting artificial bone. The second connection hole 33 may extend in a radial direction of the stud 30.

As shown in fig. 10 and 11, the second connection hole 33 is plural, and the plural second connection holes 33 are provided at intervals in the axial direction of the stud 30. The second connection holes 33 are filled with adhesive, which increases the contact area between the adhesive and the humeral head of the patient, so that the connection is more reliable.

As shown in fig. 6 and 7, the intramedullary rod 20 further includes a plurality of fins 26, the plurality of fins 26 being spaced apart in the circumferential direction of the cylinder 22, the fins 26 being connected between the cylinder 22 and the inner surface of the cover structure 21, the outer surfaces of the fins 26 being provided with a porous coating. The plurality of fins 26 and the first connection holes 24 are arranged at intervals, the fins 26 are connected with the humeral head of a patient, the outer surfaces of the fins 26 are provided with porous coatings, the arrangement of the porous coatings is beneficial to bone ingrowth, better bone fusion can be realized, and the connection stability of the intramedullary rod 20 and external bone can be further improved. The fins 26 are made of a dense material and have high strength, so that the intramedullary rod 20 has good rotation resistance. The fins 26 are connected at the top to the top wall of the cap body structure 21 and at the lower part projecting downward from the humeral head cap body 10.

By applying the technical scheme of the embodiment, the humerus prosthesis is connected with the humerus head of the patient through a plurality of structures of the second thread section 34, the fin 26, the first connecting hole 24 and the second connecting hole 33, so that the connection is reliable and is not easy to loosen.

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 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 humeral prosthesis, comprising:

a humeral head cap (10) comprising a spherical outer wall surface (11) and an inner wall surface located within the spherical outer wall surface (11), the inner wall surface comprising a top wall (14) and an annular side wall (12) connected to the top wall (14);

an intramedullary post (20) connected to the humeral head cap (10), a top of the intramedullary post (20) being located within the humeral head cap (10);

the stud (30) penetrates through the intramedullary rod (20), the stud (30) comprises a connecting head (32), a first threaded section (31) and a second connecting hole (33), and the second connecting hole (33) penetrates through the radial direction of the stud (30) and is positioned below the first threaded section (31);

wherein a conical surface matching structure is arranged between the annular side wall (12) and the intramedullary rod (20), and the humeral head cap body (10) and the intramedullary rod (20) are connected through the conical surface matching structure.

2. The humeral prosthesis according to claim 1, characterized in that the intramedullary rod (20) includes a cap structure (21) and a cylinder (22) disposed within the cap structure (21), the outer surface of the cap structure (21) and the annular side wall (12) fit together to form the conical surface mating structure; wherein, the outer contour of the cover body structure (21) is in a round table shape.

3. The humeral prosthesis according to claim 2, characterized in that a connection structure is further provided between the humeral head cap (10) and the intramedullary rod (20), the connection structure including:

the circular truncated cone structure (13) is arranged on the top wall (14), and the diameter of the circular truncated cone structure (13) is gradually reduced along the direction far away from the top wall (14);

the mounting hole (23) is formed in the column body (22), and the circular truncated cone structure (13) is inserted into the mounting hole (23);

wherein, a distance is reserved between the circular truncated cone structure (13) and the mounting hole (23).

4. The humeral prosthesis according to claim 3, characterized in that a first connection hole (24) is provided on the cylinder (22), the first connection hole (24) communicating with the mounting hole (23).

5. The humeral prosthesis according to claim 4, characterized in that an inner hole (25) communicating with the mounting hole (23) is further formed in the column (22), the inner hole (25) is arranged along an axial direction of the column (22), a stop step (27) is formed between the inner hole (25) and the mounting hole (23), the first thread section (31) is in threaded connection with the inner hole (25), and the stop step (27) is in stop fit with the connector (32).

6. The humeral prosthesis according to claim 5, characterized in that the second connection hole (33) is plural, and the plural second connection holes (33) are provided at intervals in the axial direction of the stud (30).

7. The humeral prosthesis of claim 5, characterized in that the stud (30) further includes a second threaded section (34), the second threaded section (34) being located below the first threaded section (31), the thread pitch of the first threaded section (31) being greater than the thread pitch of the second threaded section (34).

8. The humeral prosthesis of claim 5, characterized in that the stud (30) is a hollow structure filled with an adhesive.

9. The humeral prosthesis of claim 2, characterized in that the intramedullary post (20) further includes a plurality of fins (26), the plurality of fins (26) being spaced circumferentially of the cylinder (22), the fins (26) being connected between the cylinder (22) and the inner surface of the cap structure (21), the outer surfaces of the fins (26) being provided with a porous coating.