CN107647945B

CN107647945B - Elbow joint prosthesis

Info

Publication number: CN107647945B
Application number: CN201710959134.XA
Authority: CN
Inventors: 刘昆玺
Original assignee: Beijing AK Medical Co Ltd
Current assignee: Beijing AK Medical Co Ltd
Priority date: 2017-10-16
Filing date: 2017-10-16
Publication date: 2023-08-01
Anticipated expiration: 2037-10-16
Also published as: CN107647945A

Abstract

The present invention provides an elbow joint prosthesis comprising: a humeral prosthesis and an ulna prosthesis, the humeral prosthesis and the ulna prosthesis being articulated to each other; wherein, the lateral walls of the humerus prosthesis and the ulna prosthesis are respectively provided with a strip ridge so that the humerus prosthesis is jointed and fixed with the inner wall of the humerus marrow cavity through the strip ridge when the humerus prosthesis is implanted into the humerus marrow cavity, and the ulna prosthesis is jointed and fixed with the inner wall of the ulna marrow cavity through the strip ridge when the ulna prosthesis is implanted into the ulna marrow cavity. Thereby greatly improving the initial fixing stability of the prosthesis in the elbow joint arthroplasty, ensuring the long-term fixing effect and prolonging the service life of the prosthesis. Solves the problem of poor mechanical fixation stability in the early stage of the elbow joint prosthesis in the prior art.

Description

Elbow joint prosthesis

Technical Field

The invention relates to the field of medical equipment, in particular to an elbow joint prosthesis.

Background

There is relatively little chance of inflammation invading the elbow joint, but once the elbow joint is inflamed, it can affect the function of the upper limb. Elbow arthroplasty is an effective method of treating elbow joint inflammation. Currently, there is a tremendous development in elbow arthroplasty, ranging from simple to complex anatomic elbow prostheses. As with other joint prosthesis replacement procedures, infection and prosthesis loosening are the primary causes of failure of the elbow arthroplasty prosthesis, so the stability of the prosthesis in the human body is an important factor affecting the useful life of the prosthesis.

At present, the prosthesis fixing mode in clinic has two modes of bone cement fixing and biological fixing, and the biological fixing can keep cancellous bone and reduce damage to a marrow cavity, so the prosthesis fixing mode is popular with clinicians.

The biological fixation of the elbow joint prosthesis is realized by integrating bone tissue and a rough structure (such as titanium paste spraying) on the surface of the prosthesis. But effective osseointegration takes a longer time and belongs to a long-term fixation mode. The initial fixation belongs to mechanical fixation, namely temporary fixation is formed by utilizing the structure of the prosthesis and bone, and the initial fixation effect directly influences the long-term fixation effect. The prior initial fixing position can be changed after the prosthesis is stressed, and local fixing can be realized only due to the irregularity of the shape of the medullary cavity, so that the defect in the prior art is that the initial stability of the implanted prosthesis cannot be well ensured, and hidden danger is left for long-term prosthesis failure.

Disclosure of Invention

The invention mainly aims to provide an elbow joint prosthesis, which solves the problem of poor mechanical fixation stability in the early stage of the elbow joint prosthesis in the prior art.

To achieve the above object, the present invention provides an elbow joint prosthesis comprising: a humeral prosthesis and an ulna prosthesis, the humeral prosthesis and the ulna prosthesis being articulated to each other; wherein, the lateral walls of the humerus prosthesis and the ulna prosthesis are respectively provided with a strip ridge so that the humerus prosthesis is jointed and fixed with the inner wall of the humerus marrow cavity through the strip ridge when the humerus prosthesis is implanted into the humerus marrow cavity, and the ulna prosthesis is jointed and fixed with the inner wall of the ulna marrow cavity through the strip ridge when the ulna prosthesis is implanted into the ulna marrow cavity.

Further, a strip-shaped ridge on the humeral prosthesis extends along the extension direction of the humeral prosthesis; and/or, the upper strip ridge of the ulna prosthesis extends in the extension direction of the ulna prosthesis.

Further, the plurality of strip-shaped ridges on the humerus prosthesis are arranged at intervals along the circumferential direction of the humerus prosthesis; and/or the plurality of strip-shaped ridges on the ulna prosthesis are arranged at intervals along the circumference of the ulna prosthesis.

Further, the humeral prosthesis has a hinged end and a free end, the ulna prosthesis has a hinged end and a free end, the hinged end of the humeral prosthesis and the hinged end of the ulna prosthesis are hinged to each other, the free end of the humeral prosthesis is for insertion into the humeral cavity, and the free end of the ulna prosthesis is for insertion into the ulna cavity.

Further, the free end of the humeral prosthesis and the free end of the ulna prosthesis are both tapered heads.

Further, the strip-shaped ridge on the humerus prosthesis extends along the extending direction of the humerus prosthesis, and one end, close to the free end of the humerus prosthesis, of the strip-shaped ridge on the humerus prosthesis is of a wedge-shaped structure; and/or the strip-shaped ridge on the ulna prosthesis extends along the extending direction of the ulna prosthesis, and one end, close to the free end of the ulna prosthesis, of the strip-shaped ridge on the ulna prosthesis is in a wedge-shaped structure.

Further, a first bone cement channel is formed on the humeral prosthesis, and the first bone cement channel is used for guiding bone cement into a gap between the outer wall of the humeral prosthesis and the inner wall of the humeral cavity when the humeral prosthesis is implanted into the humeral cavity so as to fix the humeral prosthesis and the inner wall of the humeral cavity.

Further, the first bone cement channel includes: a first axial flow guide hole opened along the extension direction of the humerus prosthesis for guiding bone cement from the proximal end of the humerus prosthesis to the distal end of the humerus prosthesis; a first radial pilot hole is radially open to communicate the first axial pilot hole with an exterior of the humeral prosthesis for guiding bone cement from the first axial pilot hole into a void between an exterior wall of the humeral prosthesis and an interior wall of the humeral intramedullary canal.

Further, a second bone cement channel is provided on the ulna prosthesis for guiding bone cement into a gap between an outer wall of the ulna prosthesis and an inner wall of the ulna marrow cavity when the ulna prosthesis is implanted into the ulna marrow cavity so as to fix the ulna prosthesis and the inner wall of the ulna marrow cavity.

Further, the second bone cement channel includes: a second axial flow-guiding hole opened along the extending direction of the ulna prosthesis for guiding bone cement from the proximal end of the ulna prosthesis to the distal end of the ulna prosthesis; a second radial flow orifice opens radially of the ulna prosthesis to communicate the second radial flow orifice with an exterior of the ulna prosthesis for directing bone cement from the second radial flow orifice into a void between an exterior wall of the ulna prosthesis and an interior wall of the ulna intramedullary canal.

Further, the humerus prosthesis has a first connecting portion, the ulna prosthesis has a second connecting portion, and the first connecting portion and the second connecting portion are hinged to each other through a connecting pin shaft.

Further, the first connecting part comprises two clamping plates which are oppositely arranged, and the two clamping plates are provided with first connecting holes; the second connecting part comprises a positioning plate, and a second connecting hole is formed in the positioning plate; the locating plate is embedded between the two clamping plates so that the first connecting hole and the second connecting hole are aligned, and the connecting pin shaft penetrates through the first connecting hole and the second connecting hole to mutually hinge the first connecting portion and the second connecting portion.

Further, the elbow joint prosthesis further comprises: the shaft sleeve is sleeved on the connecting pin shaft and is positioned in a gap between the connecting pin shaft and the first connecting hole and/or a gap between the connecting pin shaft and the second connecting hole.

Further, the elbow joint prosthesis further comprises: the locking pin is penetrated on the second connecting part and is abutted with the connecting pin shaft, and is used for locking the connecting pin shaft with the second connecting part.

The elbow joint prosthesis applying the technical scheme of the invention comprises the following components: a humeral prosthesis and an ulna prosthesis, the humeral prosthesis and the ulna prosthesis being articulated to each other; wherein, the lateral walls of the humerus prosthesis and the ulna prosthesis are respectively provided with a strip ridge so that the humerus prosthesis is jointed and fixed with the inner wall of the humerus marrow cavity through the strip ridge when the humerus prosthesis is implanted into the humerus marrow cavity, and the ulna prosthesis is jointed and fixed with the inner wall of the ulna marrow cavity through the strip ridge when the ulna prosthesis is implanted into the ulna marrow cavity. Thereby greatly improving the initial fixing stability of the prosthesis in the elbow joint arthroplasty, ensuring the long-term fixing effect and prolonging the service life of the prosthesis. Solves the problem of poor mechanical fixation stability in the early stage of the elbow joint prosthesis in the prior art.

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 is a schematic illustration of the structure of an alternative elbow joint prosthesis according to an embodiment of the present invention;

FIG. 2 is a schematic perspective view of a humeral prosthesis of an elbow joint prosthesis according to an alternative embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a humeral prosthesis of an elbow joint prosthesis according to an alternative embodiment of the present invention;

FIG. 4 is a schematic perspective view of an ulna prosthesis of an alternative elbow joint prosthesis according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of an ulna prosthesis of an alternative elbow joint prosthesis according to an embodiment of the present invention;

FIG. 6 is a schematic view of the structure of a sleeve of a humeral prosthesis of an elbow joint prosthesis according to an alternative embodiment of the present invention;

FIG. 7 is a schematic view of a connecting pin of a humeral prosthesis of an elbow joint prosthesis according to an alternative embodiment of the present invention; and

fig. 8 is a schematic view of the structure of a humeral prosthesis locking pin of an elbow joint prosthesis according to an alternative embodiment of the present invention.

Wherein the above figures include the following reference numerals:

10. a humeral prosthesis; 11. a first connection portion; 111. a clamping plate; 112. a first connection hole; 20. an ulna prosthesis; 21. a second connecting portion; 211. a positioning plate; 212. a second connection hole; 30. a strip-shaped ridge; 40. a first bone cement channel; 41. a first axial flow guide hole; 42. a first radial flow-guiding aperture; 50. a second bone cement channel; 51. a second axial flow guide hole; 52. a second radial flow-guiding aperture; 60. a connecting pin shaft; 70. a shaft sleeve; 80. locking nails; 90. humeral cavity; 100. a ulnar marrow cavity; 110. a distal plug.

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.

An elbow joint prosthesis according to an embodiment of the present invention, as shown in fig. 1, includes: a humeral prosthesis 10 and an ulna prosthesis 20, the humeral prosthesis 10 and the ulna prosthesis 20 being hinged to each other; wherein the lateral walls of the humeral prosthesis 10 and the ulna prosthesis 20 are each provided with a strip ridge 30 to engage and secure the humeral prosthesis 10 with the inner wall of the humeral cavity 90 via the strip ridge 30 thereon when the humeral prosthesis 10 is implanted in the humeral cavity 90, and to engage and secure the ulna prosthesis 20 with the inner wall of the ulna cavity 100 via the strip ridge 30 thereon when the ulna prosthesis 20 is implanted in the ulna cavity 100.

The elbow joint prosthesis applying the technical scheme of the invention comprises the following components: a humeral prosthesis 10 and an ulna prosthesis 20, the humeral prosthesis 10 and the ulna prosthesis 20 being hinged to each other; wherein the lateral walls of the humeral prosthesis 10 and the ulna prosthesis 20 are each provided with a strip ridge 30 to engage and secure the humeral prosthesis 10 with the inner wall of the humeral cavity 90 via the strip ridge 30 thereon when the humeral prosthesis 10 is implanted in the humeral cavity 90, and to engage and secure the ulna prosthesis 20 with the inner wall of the ulna cavity 100 via the strip ridge 30 thereon when the ulna prosthesis 20 is implanted in the ulna cavity 100. Thereby greatly improving the initial fixing stability of the prosthesis in the elbow joint arthroplasty, ensuring the long-term fixing effect and prolonging the service life of the prosthesis. Solves the problem of poor mechanical fixation stability in the early stage of the elbow joint prosthesis in the prior art.

In particular, as shown in figures 1, 2 and 4, the strip-shaped ridge 30 on the humeral prosthesis 10 extends along the extension of the humeral prosthesis 10; and/or, the upper strip ridge 30 of the ulna prosthesis 20 extends in the direction of extension of the ulna prosthesis 20. The plurality of the strip-shaped ridges 30 are arranged on the humerus prosthesis 10, the plurality of the strip-shaped ridges 30 are arranged at intervals along the circumferential direction of the humerus prosthesis 10, and the strip-shaped ridges 30 are mutually parallel; and/or the plurality of strip-shaped ridges 30 on the ulna prosthesis 20, the plurality of strip-shaped ridges 30 being spaced apart along the circumference of the ulna prosthesis 20 and the plurality of strip-shaped ridges 30 being parallel to each other. After the humeral prosthesis 10 is implanted in the humeral cavity 90, the various strip ridges 30 on the humeral prosthesis 10 are embedded in the cortical bone on the inner wall of the humeral cavity 90 to secure the humeral prosthesis 10; after the ulna prosthesis 20 is implanted into the ulna marrow cavity 100, the individual strip-shaped ridges 30 on the ulna prosthesis 20 are embedded in the cortical bone on the inner wall of the ulna marrow cavity 100 to secure the ulna prosthesis 20.

Further, the humeral prosthesis 10 has an articulating end and a free end, the ulna prosthesis 20 has an articulating end and a free end, the articulating ends of the humeral prosthesis 10 and 20 are articulated to one another, the free end of the humeral prosthesis 10 is for insertion into the humeral cavity 90, and the free end of the ulna prosthesis 20 is for insertion into the ulnar cavity 100. To facilitate insertion of the humeral prosthesis 10 into the humeral cavity 90 and insertion of the ulna prosthesis 20 into the ulna cavity 100, further, the free end of the humeral prosthesis 10 and the free end of the ulna prosthesis 20 are tapered heads. Meanwhile, one end of the strip-shaped ridge 30 positioned on the humerus prosthesis 10, which is close to the free end of the humerus prosthesis 10, is in a wedge-shaped structure; the end of the strip-shaped ridge 30 located on the ulna prosthesis 20 near the free end of the ulna prosthesis 20 is wedge-shaped. The wedge-shaped structure on the strip ridge 30 of the humerus prosthesis 10 conforms to the structure of the conical head of the free end of the humerus prosthesis 10 and the wedge-shaped structure on the strip ridge 30 of the ulna prosthesis 20 conforms to the structure of the conical head of the free end of the ulna prosthesis 20.

As shown in fig. 3, in order to be able to guide bone cement between the outer wall of the distal end of the humeral prosthesis 10 and the inner wall of the humeral cavity 90 after implantation of the humeral prosthesis 10 into the humeral cavity 90, the fixation effect is improved. Further, the humeral prosthesis 10 is provided with a first bone cement channel 40, the first bone cement channel 40 being configured to direct bone cement into a space between an outer wall of the distal end of the humeral prosthesis 10 and an inner wall of the humeral cavity 90 to secure the humeral prosthesis 10 to the inner wall of the humeral cavity 90 when the humeral prosthesis 10 is implanted in the humeral cavity 90. The distal end of the humeral prosthesis 10 is the end thereof inserted into the humeral cavity 90, i.e., the free end of the humeral prosthesis 10, and the end opposite the distal end is the proximal end of the humeral prosthesis 10, i.e., the hinged end of the humeral prosthesis 10.

As shown in fig. 5, in order to guide bone cement between the outer wall of the distal end of the ulna prosthesis 20 and the inner wall of the ulna marrow cavity 100 after the ulna prosthesis 20 is implanted in the ulna marrow cavity 100, the fixation effect is improved. Further, a second bone cement channel 50 is provided on the ulna prosthesis 20, the second bone cement channel 50 being configured to direct bone cement into a gap between an outer wall of the distal end of the ulna prosthesis 20 and an inner wall of the ulna cavity 100 to secure the ulna prosthesis 20 to the inner wall of the ulna cavity 100 when the ulna prosthesis 20 is implanted into the ulna cavity 100. The distal end of the ulna prosthesis 20 is the end thereof that is inserted into the ulna marrow cavity 100, i.e., the free end of the ulna prosthesis 20, and the end opposite the distal end is the proximal end of the ulna prosthesis 20, i.e., the articulating end of the ulna prosthesis 20.

Specifically, as shown in fig. 1 and 3, the first bone cement channel 40 includes: a first axial flow guide hole 41 and a second radial flow guide hole, the first axial flow guide hole 41 being opened along the extension direction of the humerus prosthesis 10 for guiding bone cement from the proximal end of the humerus prosthesis 10 to the distal end of the humerus prosthesis 10; the first radial flow bore 42 opens in the radial direction of the humeral prosthesis 10 to communicate the first axial flow bore 41 with the exterior of the humeral prosthesis 10 for guiding bone cement from the first axial flow bore 41 into the void between the outer wall of the humeral prosthesis 10 and the inner wall of the humeral cavity 90.

As shown in fig. 1 and 2, the plurality of first radial flow holes 42 are arranged in a row, the first radial flow holes 42 of each row being spaced apart along the circumference of the humeral prosthesis 10, and each first radial flow hole 42 of each row being arranged in the extension direction of the humeral prosthesis 10 and being located between two adjacent strip ridges 30. After the humerus prosthesis 10 is implanted into the humerus marrow cavity 90, each strip ridge 30 on the humerus prosthesis 10 is embedded into the cortical bone on the inner wall of the humerus marrow cavity 90, a plurality of strip spaces are formed between the outer wall of the humerus prosthesis 10, the two adjacent strip ridges 30 and the inner wall of the humerus marrow cavity 90, bone cement is poured into the proximal end of the first axial guide hole 41, flows out of the first radial guide hole 42 into each strip space after reaching the distal end of the first axial guide hole 41, and fixes the humerus prosthesis 10 and the humerus marrow cavity 90.

As shown in fig. 1 and 5, the second bone cement channel 50 includes: a second axial flow guide hole 51 and a second radial flow guide hole 52, the second axial flow guide hole 51 being opened in an extending direction of the ulna prosthesis 20 for guiding bone cement from a proximal end of the ulna prosthesis 20 to a distal end of the ulna prosthesis 20; the second radial flow bore 52 opens in the radial direction of the ulna prosthesis 20 to communicate the second axial flow bore 51 with the exterior of the ulna prosthesis 20 for guiding bone cement from the second axial flow bore 51 into the void between the outer wall of the ulna prosthesis 20 and the inner wall of the ulna intramedullary canal 100.

As shown in fig. 1 and 4, the plurality of second radial flow holes 52 are provided in a plurality of rows, the second radial flow holes 52 of each row being disposed at intervals along the circumference of the ulna prosthesis 20, and each second radial flow hole 52 of each row being disposed along the extension direction of the ulna prosthesis 20 and between the adjacent two of the strip-shaped ridges 30. After the ulna prosthesis 20 is implanted into the ulna marrow cavity 100, each strip ridge 30 on the ulna prosthesis 20 is embedded into the cortical bone on the inner wall of the ulna marrow cavity 100, a plurality of strip spaces are formed between the outer wall of the ulna prosthesis 20, the two adjacent strip ridges 30 and the inner wall of the ulna marrow cavity 100, bone cement is poured into the proximal end of the second axial flow guide hole 51, reaches the distal end of the second axial flow guide hole 51, and flows out of the second radial flow guide hole 52 into each strip space to fix the humerus prosthesis 10 with the ulna marrow cavity 100.

After the humerus prosthesis 10 is implanted in the humerus bone marrow cavity 90 and after the ulna prosthesis 20 is implanted in the ulna bone marrow cavity 100, it is necessary to connect the humerus prosthesis 10 and the ulna prosthesis 20 to each other, further, as shown in fig. 1, the humerus prosthesis 10 has a first connection part 11, the ulna prosthesis 20 has a second connection part 21, and the first connection part 11 and the second connection part 21 are hinged to each other by a connection pin 60 so as to connect the humerus prosthesis 10 and the ulna prosthesis 20 to each other rotatably.

Specifically, as shown in fig. 2 to 5, the first connecting portion 11 includes two opposite clamping plates 111, and first connecting holes 112 are formed in both clamping plates 111; the second connecting part 21 comprises a positioning plate 211, and a second connecting hole 212 is formed in the positioning plate 211; the humerus prosthesis 10 and the ulna prosthesis 20 are rotatably connected to each other by inserting the positioning plate 211 between the two clamping plates 111 to align the first and second connection holes 112 and 212 and then inserting the connection pin 60 into the first and second connection holes 112 and 212 to hinge the first and second connection parts 11 and 21 to each other.

In order to better interact with the connecting pin 60 with the first connecting hole 112 or the second connecting hole 212, the elbow prosthesis further comprises, as shown in fig. 1 and 6: the shaft sleeve 70, the shaft sleeve 70 is sleeved on the connection pin 60 and is embedded in a gap between the connection pin 60 and the first connection hole 112 and/or a gap between the connection pin 60 and the second connection hole 212, so that the connection pin 60 can be better matched with the first connection hole 112 or the second connection hole 212.

When the humerus prosthesis 10 and the ulna prosthesis 20 are rotated with each other, the connecting pin 60 is fixed to the positioning plate 211 of the second connecting portion 21 so as to be stationary, and the two clamping plates 111 of the first connecting portion 11 are rotated with respect to the connecting pin 60. Accordingly, in order to fix the connection pin 60 and the second connection portion 21 to each other, further, as shown in fig. 1, 7 and 8, pin holes are formed in the connection pin 60, and accordingly, corresponding pin holes are also formed in the positioning plate 211 of the second connection portion 21, after the connection pin 60 is assembled into the second connection hole 212, the pin holes in the connection pin 60 are aligned with the pin holes in the positioning plate 211, and then the second connection portion 21 is locked and fixed with the connection pin 60 by passing the pins 80 through the pin holes in the positioning plate 211 and the pin holes in the connection pin 60.

In the clinical operation process, firstly, the humerus marrow cavity 90 is filed into the same diameter size as the handle body of the humerus prosthesis 10 by using a reamer, then the humerus marrow cavity 90 is plugged by using a distal plug 110, then the humerus prosthesis 10 is implanted and pressed in place, the strip-shaped ridges 30 uniformly distributed on the humerus prosthesis 10 can be embedded into the cortical bone of the humerus marrow cavity 90 and tightly meshed with the cortical bone, so that the initial biomechanical fixation of the humerus prosthesis 10 is realized, meanwhile, the bone cement is injected into the humerus prosthesis 10 along the first axial flow hole 41 in the middle of the handle body of the humerus prosthesis 10 by pressing, and is permeated into the humerus marrow cavity 90 by the first radial flow hole 42 distributed along the circumferential direction of the handle body of the humerus prosthesis 10, the distal plug 110 prevents the bone cement from exceeding the expected diffusion, and the bone cement forms a micro-inner hinge locking mechanism with bone, so that the fixation of the partial bone cement is realized, and thus the mixed fixation mode of biomechanical fixation and bone cement fixation is realized, and the initial stability of the humerus prosthesis 10 is enhanced.

According to the above steps, the ulna pulp chamber 100 is filed with a reamer having the same diameter as the shank of the ulna prosthesis 20, and then the ulna pulp chamber 100 is plugged with the distal plug 110, the ulna prosthesis 20 is implanted and pressed in place, and the uniformly distributed strip-shaped ridges 30 on the ulna prosthesis 20 can be embedded into the cortical bone of the ulna pulp chamber 100 and tightly engaged with the cortical bone to achieve the initial biomechanical fixation of the ulna pulp chamber 100. Meanwhile, bone cement is injected into the ulna prosthesis 20 along the second axial flow guide holes 51 in the middle of the shank of the ulna prosthesis 20 by pressing, and is infiltrated into the ulna marrow cavity 100 through the second radial flow guide holes 52 distributed along the circumferential direction of the ulna prosthesis 20, the distal plug 110 prevents the bone cement from diffusing beyond expectations, and the bone cement and bone form a micro-internal hinge locking mechanism, so that the fixation of local bone cement is realized, the mixed fixation mode of biological mechanical fixation and bone cement fixation is realized, and the initial stability of the ulna prosthesis 20 is enhanced.

After the installation of both sides of the humerus prosthesis 10 and the ulna prosthesis 20 is completed, the sleeve 70 is fitted into the first connecting hole 112 on the clamping plate 111 of the humerus prosthesis 10, the positioning plate 211 of the ulna prosthesis 20 is inserted between the two clamping plates 111 of the humerus prosthesis 10, the first connecting hole 112 of the humerus prosthesis 10 is aligned with the second connecting hole 212 of the ulna prosthesis 20, the connecting pin shaft 60 is inserted into the first connecting hole 112 of the humerus prosthesis 10 and the second connecting hole 212 of the ulna prosthesis 20, and the positioning plate 211 of the ulna prosthesis 20 is locked and fixed with the connecting pin shaft 60 by the locking pin 80, thereby realizing the fixed connection of the humerus prosthesis 10 and the ulna prosthesis 20.

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. An elbow joint prosthesis comprising:

-a humeral prosthesis (10) and an ulna prosthesis (20), the humeral prosthesis (10) and the ulna prosthesis (20) being mutually articulated;

wherein a strip-shaped ridge (30) is arranged on the side wall of each of the humeral prosthesis (10) and the ulna prosthesis (20) so as to enable the humeral prosthesis (10) to be engaged and fixed with the inner wall of the humeral cavity (90) through the strip-shaped ridge (30) when the humeral prosthesis (10) is implanted into the humeral cavity (90) and enable the ulna prosthesis (20) to be engaged and fixed with the inner wall of the ulna cavity (100) through the strip-shaped ridge (30) when the ulna prosthesis (20) is implanted into the ulna cavity (100);

a first bone cement channel (40) is formed in the humeral prosthesis (10), and the first bone cement channel (40) is used for guiding bone cement into a gap between the outer wall of the humeral prosthesis (10) and the inner wall of the humeral cavity (90) when the humeral prosthesis (10) is implanted into the humeral cavity (90) so as to fix the humeral prosthesis (10) and the inner wall of the humeral cavity (90);

the first bone cement channel (40) comprises a first axial flow guide hole (41) and a first radial flow guide hole (42), wherein the first axial flow guide hole (41) is formed along the extending direction of the humerus prosthesis (10) and is used for guiding bone cement from the proximal end of the humerus prosthesis (10) to the distal end of the humerus prosthesis (10); the first radial flow guide hole (42) is opened along the radial direction of the humerus prosthesis (10) so as to communicate the first axial flow guide hole (41) with the outside of the humerus prosthesis (10) and is used for guiding bone cement into a gap between the outer wall of the humerus prosthesis (10) and the inner wall of the humerus medullary cavity (90) through the first axial flow guide hole (41).

2. The elbow joint prosthesis according to claim 1, wherein a strip-like ridge (30) on the humeral prosthesis (10) extends in the extension direction of the humeral prosthesis (10); and/or, an upper strip-like ridge (30) located on the ulna prosthesis (20) extends in the direction of extension of the ulna prosthesis (20).

3. The elbow joint prosthesis according to claim 2, wherein the plurality of strip-shaped ridges (30) on the humeral prosthesis (10) are provided in a plurality of strips of ridges (30) spaced apart along the circumference of the humeral prosthesis (10); and/or the plurality of strip-shaped ridges (30) positioned on the ulna prosthesis (20), the plurality of strip-shaped ridges (30) being arranged at intervals along the circumference of the ulna prosthesis (20).

4. The elbow joint prosthesis according to claim 1, wherein the humeral prosthesis (10) has a hinged end and a free end, the ulnar prosthesis (20) has a hinged end and a free end, the hinged end of the humeral prosthesis (10) and the hinged end of the ulnar prosthesis (20) are hinged to each other, the free end of the humeral prosthesis (10) is for insertion into the humeral cavity (90), and the free end of the ulnar prosthesis (20) is for insertion into the ulnar cavity (100).

5. Elbow joint prosthesis according to claim 4, wherein the free end of the humeral prosthesis (10) and the free end of the ulna prosthesis (20) are both conical heads.

6. The elbow joint prosthesis according to claim 5, wherein the strip-shaped ridge (30) on the humeral prosthesis (10) extends in the extension direction of the humeral prosthesis (10), the end of the strip-shaped ridge (30) on the humeral prosthesis (10) near the free end of the humeral prosthesis (10) being of wedge-shaped configuration; and/or the strip-shaped ridge (30) on the ulna prosthesis (20) extends along the extending direction of the ulna prosthesis (20), and one end, close to the free end of the ulna prosthesis (20), of the strip-shaped ridge (30) on the ulna prosthesis (20) is in a wedge-shaped structure.

7. The elbow joint prosthesis according to claim 1, wherein the ulna prosthesis (20) is provided with a second bone cement channel (50), the second bone cement channel (50) being adapted to direct bone cement into a space between an outer wall of the ulna prosthesis (20) and an inner wall of the ulna pulp chamber (100) to secure the ulna prosthesis (20) to the inner wall of the ulna pulp chamber (100) when the ulna prosthesis (20) is implanted in the ulna pulp chamber (100).

8. The elbow joint prosthesis according to claim 7, wherein the second bone cement channel (50) comprises:

a second axial flow bore (51) open along the extension of the ulna prosthesis (20) for guiding bone cement from the proximal end of the ulna prosthesis (20) to the distal end of the ulna prosthesis (20);

a second radial flow guide hole (52) is opened along the radial direction of the ulna prosthesis (20) to communicate the second radial flow guide hole (51) with the outside of the ulna prosthesis (20) for guiding bone cement from the second radial flow guide hole (51) into a gap between the outer wall of the ulna prosthesis (20) and the inner wall of the ulna intramedullary canal (100).

9. Elbow joint prosthesis according to claim 1, wherein the humeral prosthesis (10) has a first connection (11) and the ulna prosthesis (20) has a second connection (21), the first connection (11) and the second connection (21) being hinged to each other by means of a connecting pin (60).

10. Elbow joint prosthesis according to claim 9, wherein said first connection portion (11) comprises two opposite clamping plates (111), a first connection hole (112) being provided in each of said clamping plates (111); the second connecting part (21) comprises a positioning plate (211), and a second connecting hole (212) is formed in the positioning plate (211);

the positioning plate (211) is embedded between the two clamping plates (111) so that the first connecting holes (112) and the second connecting holes (212) are aligned, and the connecting pin shafts (60) penetrate through the first connecting holes (112) and the second connecting holes (212) to mutually hinge the first connecting portions (11) and the second connecting portions (21).

11. The elbow joint prosthesis of claim 10, wherein the elbow joint prosthesis further comprises:

the shaft sleeve (70) is sleeved on the connecting pin shaft (60), and the shaft sleeve (70) is positioned in a gap between the connecting pin shaft (60) and the first connecting hole (112) and/or in a gap between the connecting pin shaft (60) and the second connecting hole (212).

12. The elbow joint prosthesis of claim 9, wherein the elbow joint prosthesis further comprises:

the locking pin (80) is arranged on the second connecting part (21) in a penetrating way and is abutted with the connecting pin shaft (60) in a abutting way, and is used for locking the connecting pin shaft (60) and the second connecting part (21).