CN110393613B - An elbow joint prosthesis - Google Patents

Abstract

The invention relates to the technical field of medical prostheses, and discloses an elbow joint prosthesis. The elbow joint prosthesis comprises: a first lug and a second lug which extend along the length direction far away from the humerus prosthesis are respectively formed on two opposite sides of the connecting end of the humerus prosthesis, a first through hole is formed on the first lug, and a second through hole coaxial with the first through hole is formed on the second lug; an ulna prosthesis, wherein a third through hole is arranged on one end of the ulna prosthesis opposite to the connecting end; the rotating shaft assembly comprises a rotating shaft, and the rotating shaft is used for simultaneously penetrating through the first through hole, the second through hole and the third through hole so as to rotationally connect the humerus prosthesis with the ulna prosthesis. The rotating shaft is arranged to stretch and retract along the axial direction of the rotating shaft, so that after the first end of the rotating shaft can be placed into the first through hole in an initial state, the second end of the rotating shaft can be placed into the second through hole in a compressed state. The elbow joint prosthesis can improve the accuracy of the fixed connection with the medullary cavity so as to ensure the stability after the connection.

Description

Elbow joint prosthesis

Technical Field

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

Background

The elbow joint prosthesis is a surgical implant which is applied to elbow joint replacement operation and is used for replacing elbow joint parts of human patients, and mainly comprises a humerus prosthesis, an ulna prosthesis and a joint rotating shaft. The humerus prosthesis is used for being connected with the humerus of a human body, the ulna prosthesis is used for being connected with the ulna of the human body, and the joint rotating shaft is used for connecting the humerus prosthesis and the end part of the ulna prosthesis so as to enable the humerus prosthesis and the end part of the ulna prosthesis to rotate relatively.

However, elbow joint prostheses have several disadvantages in use: on one hand, the elbow joint prosthesis is connected with the humerus prosthesis and the ulna prosthesis through the joint rotating shaft, when the elbow joint prosthesis is used, the ulna prosthesis and the humerus prosthesis are required to be integrally fixed in corresponding marrow cavities after being connected outside a human body, so that inaccuracy of the fixing positions of the ulna prosthesis and the humerus prosthesis in the marrow cavities is easily caused, the operation is failed or the fixing positions of the prosthesis in the marrow cavities are required to be re-fixed, and the operation difficulty of doctors in the operation is increased; on the other hand, the elbow joint prosthesis often designs a certain clearance between the ulna prosthesis and the humerus prosthesis, so that the ulna prosthesis can rotate relative to the humerus prosthesis, and meanwhile, the ulna prosthesis can swing through the clearance, so that the phenomenon that the elbow joint prosthesis is loosened or dislocated due to the fact that shearing stress generated when the radius of a human body rotates and swings is transmitted to the elbow joint prosthesis, bone cement or bone interface is avoided, but the problem that larger swing is generated between the ulna prosthesis and the humerus prosthesis is caused to a certain extent, the loosening of the humerus prosthesis or the ulna prosthesis is easily caused, the connection stability of the elbow joint prosthesis is reduced, and even when the clearance is large, the abrasion of the articular surface at the elbow joint of the human body is easily caused.

Aiming at the defects of the prior art, a person skilled in the art is urgent to find an elbow joint prosthesis which can improve the accuracy of the fixed connection with the medullary cavity so as to ensure the stability after the connection.

Disclosure of Invention

In order to improve the accuracy of the fixed connection with the medullary cavity and ensure the stability after the connection, the invention provides an elbow joint prosthesis.

The elbow joint prosthesis according to the present invention comprises: a first lug and a second lug which extend along the length direction far away from the humerus prosthesis are respectively formed on two opposite sides of the connecting end of the humerus prosthesis, a first through hole is formed on the first lug, and a second through hole coaxial with the first through hole is formed on the second lug; an ulna prosthesis, wherein a third through hole is arranged on one end of the ulna prosthesis opposite to the connecting end; and the rotating shaft assembly comprises a rotating shaft, and the rotating shaft is used for simultaneously penetrating through the first through hole, the second through hole and the third through hole so as to rotationally connect the humerus prosthesis with the ulna prosthesis. The rotating shaft is arranged to be capable of stretching along the axial direction of the rotating shaft, so that after the first end of the rotating shaft can be placed into the first through hole in an initial state, the second end of the rotating shaft can be placed into the second through hole in a compressed state, and one end, opposite to the connecting end, of the ulna prosthesis is rotationally connected between the first lug and the second lug.

Further, the first end and the second end of the rotating shaft are both arranged to be capable of extending and retracting along the axial direction of the rotating shaft.

Further, the rotating shaft assembly further comprises two humeral sleeves which are sleeved on the rotating shaft and are positioned between the first lug and the ulna prosthesis and between the second lug and the ulna prosthesis, and the two humeral sleeves are respectively connected with the first lug and the second lug in a sliding mode.

Further, first notches are formed on opposite sides of the first lug and the second lug, the first notches are respectively communicated with outer edges of the first lug and the second lug, and first sliding blocks matched with the first notches are respectively formed on opposite sides of the humerus shaft sleeve, opposite to the first lug and the second lug.

Further, the first slot has a tapered width in a direction away from an outer edge of the first lug or the second lug.

Further, second notches are formed on two opposite sides of the first lug and the second lug, the second notches are located in the first notches or the second notches are located outside the first notches, and second sliding blocks matched with the second notches are formed on the sides, opposite to the first lug or the second lug, of the humerus shaft sleeve respectively.

Further, an expansion groove is formed in an end of the second slider near the outer edge of the humeral sleeve, the expansion groove being configured to resiliently abut within the second slot.

Further, threaded holes are formed in the first lug and the second lug, and the rotating shaft assembly further comprises screws which are in threaded connection with the threaded holes and used for fixing the rotating shaft and/or the humerus shaft sleeve.

Further, the connecting end further comprises a connecting surface connecting the first lug and the second lug, and the elbow joint prosthesis further comprises a cushion block detachably fixed on the connecting surface, wherein the cushion block forms spherical surface fit with one end of the ulna prosthesis opposite to the connecting end.

Further, a titanium bead sintered layer is formed on the surface of the humerus prosthesis, and a titanium bead spray layer is formed on the surface of the ulna prosthesis.

Compared with the prior art, the elbow joint prosthesis has the following advantages:

1) According to the elbow joint prosthesis, the humerus prosthesis is connected with the humerus firstly, and then the ulna prosthesis is connected with the humerus prosthesis, so that before the humerus prosthesis is connected with the ulna prosthesis, the position of the rotating shaft of the elbow joint prosthesis and the rotating center of the elbow joint of a human body can be accurately determined, the elbow joint prosthesis is more matched with the elbow joint of the human body after replacement, and the accuracy of the fixed connection of the elbow joint prosthesis and the intramedullary cavity can be effectively improved, and the stability after connection of the elbow joint prosthesis is ensured;

2) According to the elbow joint prosthesis, the cushion blocks are arranged to fill the shaking gap of the ulna prosthesis relative to the humerus prosthesis, so that the stability of connection of the elbow joint prosthesis after replacement can be effectively improved, and the phenomenon of abrasion of joint surfaces caused by the existing gap problem at the elbow joint can be effectively avoided;

3) According to the elbow joint prosthesis, the two humerus shaft sleeves are sleeved on the rotating shaft, and the humerus shaft sleeves are respectively connected with the first lug and the second lug in a sliding manner, so that the rotation center of the elbow joint prosthesis can be better controlled when the ulna joint prosthesis is connected with the humerus prosthesis through the rotating shaft, and a doctor can better protect left and right condyles of an elbow joint of a human body when the ulna joint prosthesis is connected with the humerus prosthesis;

4) The ulna prosthesis of the elbow joint prosthesis can swing relative to the humerus prosthesis by forming spherical fit with the cushion block, so that when shearing stress generated when the radius of a human body rotates and swings acts on the ulna prosthesis, the ulna prosthesis can generate adaptive swing through spherical fit, and the phenomenon that the elbow joint prosthesis is loosened or dislocated due to the fact that shearing stress generated when the radius of the human body rotates and swings is transmitted to the elbow joint prosthesis, bone cement or bone interface can be effectively avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.

FIG. 1 is a schematic view of the structure of an elbow joint prosthesis according to the present invention;

FIG. 2 is a schematic view of the humeral prosthesis shown in FIG. 1;

FIG. 3 is a schematic view of the construction of the ulna prosthesis shown in FIG. 1;

FIG. 4 is a schematic view of a structure of a shaft of the shaft assembly shown in FIG. 1;

FIG. 5 is a schematic view of the humeral sleeve of the spindle assembly of FIG. 1;

FIG. 6 is a schematic view of a screw structure of the spindle assembly shown in FIG. 1;

fig. 7 is a schematic structural diagram of the pad shown in fig. 1.

Detailed Description

Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.

Fig. 1 shows the structure of an elbow joint prosthesis 100 according to the present invention. As shown in connection with fig. 1 to 4, the elbow joint prosthesis 100 includes: the humerus prosthesis 1, a first lug 12 and a second lug 13 extending along the length direction far away from the humerus prosthesis 1 are respectively formed on two opposite sides of the connecting end 11 of the humerus prosthesis 1, the first lug 12 is provided with a first through hole 121, and the second lug 13 is provided with a second through hole 131 coaxial with the first through hole 121; the ulna prosthesis 2, the end 21 of the ulna prosthesis 2 opposite to the connecting end 11 is provided with a third through hole 211; and a rotation shaft assembly 3, the rotation shaft assembly 3 including a rotation shaft 31, the rotation shaft 31 being for passing through the first through hole 121, the second through hole 131 and the third through hole 211 simultaneously to rotatably connect the humeral prosthesis 1 with the ulna prosthesis 2. Wherein the rotation shaft 31 is configured to be capable of extending and contracting in an axial direction of the rotation shaft 31, such that after the first end 311 of the rotation shaft 31 is capable of being placed in the first through hole 121 in an initial state, the second end 312 of the rotation shaft 31 is capable of being placed in the second through hole 131 in a compressed state, thereby rotatably connecting the end 21 of the ulna prosthesis 2 opposite to the connection end 11 between the first lug 12 and the second lug 13.

When the elbow joint prosthesis 100 is used, the humerus prosthesis 1 is inserted into the humeral marrow cavity of a human body, so that the humerus prosthesis 1 is connected with the humerus, and the axes of the first through hole 121 and the second through hole 131 coaxially arranged on the first lug 12 and the second lug 13 can be approximately coincident with the rotation center of the elbow joint of the human body by adjusting the position of the humerus prosthesis 1 in the humerus marrow cavity. The ulna prosthesis 2 is inserted into the intramedullary canal of the human body such that the ulna prosthesis 2 is coupled to the ulna of the human body while the shaft 31 is coupled to the third through-hole 211. The present invention enables the shaft 31 to have an initial length in an initial state and a maximum compression length in a compressed state by setting the shaft 31 to be able to expand and contract in its own axial direction, and enables the shaft 31 to be connected into the first through hole 121 and the second through hole 131 when the shaft 31 is restored to the initial length by setting the initial length to be larger than the distance between the first through hole 121 and the second through hole 131, and the maximum compression length to be smaller than or equal to the distance between the first through hole 121 and the second through hole 131 (the distance between the first through hole 121 and the second through hole 131 is understood as the distance between the first lug 12 and the second lug 13 here), so that the ulna prosthesis 2 can be inserted between the first lug 12 and the second lug 13 in the region between the first lug 12 and the second lug 13 when the shaft 31 is at the maximum compression length, thereby completing the connection of the bone prosthesis 2 and the humerus prosthesis 1 to complete the replacement of the elbow prosthesis 100, realizing the function of the motion of the elbow prosthesis.

Through the arrangement, compared with the prior art, the elbow joint prosthesis 100 of the invention can accurately determine the position of the rotating shaft of the elbow joint prosthesis 100 and the rotating center of the elbow joint of a human body before the humerus prosthesis 1 is connected with the ulna prosthesis 2 by connecting the humerus prosthesis 1 with the humerus and then connecting the ulna prosthesis 2 with the humerus prosthesis 1, so that the elbow joint prosthesis 100 of the invention is more matched with the elbow joint of the human body after replacement, thereby effectively improving the accuracy of the fixed connection of the elbow joint prosthesis 100 and the intramedullary cavity and ensuring the stability after the connection. This effectively avoids the problems of the prior art that the ulna prosthesis and the humerus prosthesis need to be quickly fixed in the intramedullary cavity after being connected in vitro, and the resulting incorrect fixation of the ulna prosthesis and the humerus prosthesis in the intramedullary cavity causes operation failure and the need to re-fix the position of the prosthesis in the intramedullary cavity.

In a preferred embodiment, the first end 311 and the second end 312 of the shaft 31 are configured to be capable of extending and retracting along the axial direction of the shaft 31, so that the ulna prosthesis 2 can be more conveniently connected to the humerus prosthesis 1 by simultaneously compressing the first end 311 and the second end 312 to connect the shaft 31 to the first through hole 121 and the second through hole 131, thereby making the connection of the ulna prosthesis 2 to the humerus prosthesis 1 more convenient.

Preferably, the shaft 31 is optionally a resilient detent.

Preferably, each of the first through hole 121 and the second through hole 131 may include a first sub through hole (not shown) for connecting the first end 311 and the second end 312, and a second sub through hole (not shown) for elastically abutting the first end 311 and the second end 312, the first sub through hole having a larger aperture than the second sub through hole, the second sub through hole being configured in a triangular shape to improve stability of elastic abutment of the first end 311 and the second end 312 with the second sub through hole.

Preferably, as shown in fig. 5, the shaft assembly 3 may further comprise two humeral sleeves 32 positioned over the shaft 31 between the first lug 12 and the ulna prosthesis 2, and between the second lug 13 and the ulna prosthesis 2, the two humeral sleeves 32 being slidably connected to the first lug 12 and the second lug 13, respectively. With this arrangement, the humeral sleeve 32 can effectively avoid contact between the first lug 12 and the ulna prosthesis 2, and between the second lug 13 and the ulna prosthesis 2, thereby effectively avoiding the problem of wear of the elbow joint prosthesis 100 due to contact between metal materials.

In a preferred embodiment as shown in fig. 5, the humeral cuff 32 may include a cuff body 324 and a stop flange 325 formed at one end of the cuff body 324, the stop flange 325 may be located between the first lug 12 and the ulna prosthesis 2, between the second lug 13 and the ulna prosthesis 2, and the cuff body 324 may be sleeved within the third through bore 211 of the ulna prosthesis 2. With this arrangement, the humeral sleeve 32 can also effectively avoid contact between the ulna prosthesis 2 and the shaft 31, thereby further avoiding the problem of wear of the elbow joint prosthesis 100 due to contact between metal materials.

In a preferred embodiment as shown in fig. 2, first notches 14 may be formed on both opposite sides of the first and second lugs 12 and 13, the first notches 14 may communicate with the outer edges of the first and second lugs 12 and 13, respectively, and first sliders 321 (shown in connection with fig. 5) that mate with the first notches 14 may be formed on the sides of the humeral sleeve 32 opposite the first and second lugs 12 and 13, respectively. Through this setting, the sliding fit of first slider 321 and first notch 14 can make ulna prosthesis 2 when linking to each other with humerus prosthesis 1 through pivot subassembly 3, can effectively restrict the installation direction and the mounted position of ulna prosthesis 2 through inserting first slider 321 in first notch 14, so not only can make pivot 31 can be more quick with first through-hole 121 and second through-hole 131 be connected, with avoid its inaccurate problem of mounted position, thereby the rotation center of elbow prosthesis 100 of control that can be better, the left and right condyle of elbow of the human body of protection that still more be convenient for the doctor when connecting ulna prosthesis 2 and humerus prosthesis 1, with the replacement time of more effective reduction elbow prosthesis 100, improve the replacement efficiency of elbow prosthesis 100.

Preferably, as shown in fig. 2, the first slot 14 may have a tapered width in a direction away from the outer edge of the first lug 12 or the second lug 13. The tapered width here can be understood as: the width of the first notch 14 gradually becomes smaller from the outer edge of the first lug 12 or the second lug 13 to the first through hole 121 or the second through hole 131, i.e., the first notch 14 may be configured in a fan-shaped structure. In this way, the first notch 14 with a larger opening facilitates the sliding connection of the first slider 321 with the first notch 14 in multiple directions when the first slider 321 is in sliding fit with the first notch 14, so that the humeral shaft sleeve 32 can be installed more conveniently and quickly.

Preferably, as shown in fig. 2, a second notch 15 may also be formed on opposite sides of the first and second lugs 12, 13, the second notch 15 may be located within the first notch 14 or the second notch 15 may be located outside the first notch 14, and a second slider 322 (shown in connection with fig. 5) may also be formed on the opposite side of the humeral sleeve 32 from the first or second lugs 12, 13, respectively, that mates with the second notch 15. By this arrangement, the sliding fit of the second notch 15 and the second slider 322 can be set to act as a guide in the sliding connection of the humeral sleeve 32 with the first lug 12 or the second lug 13, so that the accuracy of the installation of the rotation shaft 31 can be improved more effectively when the ulna prosthesis 2 is connected to the humeral prosthesis 1 through the humeral sleeve 32. Preferably, the second slot 15 may be located within the first slot 14.

Here, in order to improve the connection accuracy of the rotation shaft 31 with the first through hole 121 and the second through hole 131, the groove bottom of the first notch 14 (i.e., the bottom surface away from the outer edge of the first lug 12 or the second lug 13) and the groove bottom of the second notch 15 (i.e., the bottom surface away from the outer edge of the first lug 12 or the second lug 13) may be both provided to communicate with the first through hole 121 and the second through hole 131. In this way, the shaft 31 can be directly and accurately pushed into the first through hole 121 and the second through hole 131 through the sliding connection between the humerus shaft sleeve 32 and the first lug 12 or the second lug 13, so that the installation of the shaft 31 is more convenient, and the replacement efficiency of the elbow joint prosthesis 100 can be further improved.

In a preferred embodiment as shown in fig. 5, the end of the second slider block 322 near the outer edge of the humeral sleeve 32 can be formed with an expansion groove 323, and the expansion groove 323 can be configured to resiliently abut within the second notch 15. Through this setting, can be after the second slider 322 is connected to the tank bottom of second notch 15, through the elasticity butt of expansion groove 323 with second notch 15 for humerus sleeve 32 can fix on first lug 12 and second lug 13, thereby can effectually improve the stability after humerus sleeve 32 is connected with first lug 12 and second lug 13.

In the preferred embodiment shown in fig. 2, the first and second lugs 12 and 13 may further be formed with screw holes 16, and the shaft assembly 3 may further include screws 33 (shown in connection with fig. 6) for fixing the shaft 31 and/or the humeral shaft sleeve 32 in threaded connection with the screw holes 16, so that stability of the connection between the ulna prosthesis 2 and the humerus prosthesis 1 can be effectively improved by the screws 33 after the ulna prosthesis 2 is connected to the humerus prosthesis 1 through the shaft assembly 3.

In a preferred embodiment as shown in fig. 2, the attachment end 11 may further comprise an attachment surface 111 connecting the first and second lugs 12, 13, and the elbow prosthesis 100 may further comprise a block 4 removably secured to the attachment surface 111, the block 4 being spherically engageable with an end 21 of the ulna prosthesis 2 opposite the attachment end 11. Through the arrangement, on one hand, the shaking gap of the ulna prosthesis 2 relative to the humerus prosthesis 1 can be filled through the arranged cushion block 4, so that the stability of connection of the elbow joint prosthesis 100 after replacement can be effectively improved, and the phenomenon of abrasion of the joint surface caused by the existing gap problem at the elbow joint can be effectively avoided; on the other hand, the ulna prosthesis 2 and the cushion block 4 form spherical surface matching, so that the ulna prosthesis 2 can swing relative to the humerus prosthesis 1, and when the shear stress generated by the radius of a human body during rotation and swinging acts on the ulna prosthesis 2, the ulna prosthesis 2 can generate adaptive swinging through the spherical surface matching, thereby effectively avoiding the phenomenon of loosening or dislocation of the elbow prosthesis 100 caused by the fact that the shear stress generated by the radius of the human body during rotation and swinging is transferred to the elbow prosthesis 100, bone cement or bone interface.

In a preferred embodiment as shown in fig. 7, the pad 4 may include a top surface 41 for forming a spherical fit with the ulna prosthesis 2, and a bottom surface 42 for detachably and fixedly coupling with the coupling surface 111, a coupling post (not shown) for coupling with the coupling surface 111 may be formed on the bottom surface 42, a groove (not shown) for receiving the pad 4 may be formed on the coupling surface 111, and a coupling hole 112 (shown in conjunction with fig. 2) formed in the groove for coupling with the coupling post. Preferably, the side of the connection end 11 may be further formed with a detaching hole 113 (shown in connection with fig. 2) communicating with the head block 4 to facilitate installation and repair of the head block 4.

In a preferred embodiment, a titanium bead sintered layer (not shown) may be formed on the surface of the humeral prosthesis 1 and a titanium bead sprayed layer (not shown) may be formed on the surface of the ulna prosthesis 2. By the arrangement, the surface of the titanium bead sintered layer with a larger metal particle structure can increase the surface area of the humerus prosthesis 1, so that the fixation strength of bone cement can be effectively improved, and simultaneously, the bone ingrowth effect of the contact surface of the humerus prosthesis 1 and the humerus can be improved; the titanium bead spray coating has a smaller metal particle structure surface, so that the fixing effect of the bone cement can be effectively improved, and the on-demand fixing and long-term fixing effects of the bone cement after replacement of the ulna prosthesis 2 are improved.

In a preferred embodiment as shown in fig. 2, the humeral prosthesis 1 can further comprise a flange 17 extending from the connecting end 11 opposite the direction of extension of the first and second lugs 12, 13. With this arrangement, on the one hand, after the humerus prosthesis 1 is connected to the humerus of the human body, the flange 17 can be abutted against the outer wall of the humerus at the position where the humerus is subjected to the greatest stress, so that the bearing capacity of the humerus at the position can be effectively improved, and the function of protecting the surfaces of the bone, bone cement and elbow joint prosthesis 100 can be achieved; on the other hand, abutment of the flange 17 against the external wall of the humerus also reduces the risk of loosening and twisting of the humerus prosthesis 1, so that the stability after connection of the humerus prosthesis 1 can be further improved.

In a preferred embodiment, the cross-sectional shape of the humeral stem 18 of the humeral prosthesis 1 can be configured as a triangle (shown in connection with FIG. 2) and the cross-sectional shape of the ulnar stem 22 of the ulna prosthesis 2 can be configured as a quadrilateral (shown in connection with FIG. 3). By this arrangement, the triangular cross section of the humeral stem 18 after connection with the humeral cavity of the human body can improve its stabilizing effect and avoid rotation in the cavity, so that the stability of the humeral prosthesis 1 after connection can be improved; likewise, after the ulna stem 22 is connected with the ulna medullary cavity of the human body, the quadrilateral cross section can enable the stress of the ulna stem 22 to be more balanced, so that the strength of the ulna prosthesis 2 during use can be improved, meanwhile, the rotation of the ulna prosthesis 2 in the ulna medullary cavity can be avoided, and the stability and the use effect of the ulna prosthesis 2 after connection are improved. In addition, the above-described effects are also advantageous in terms of the adaptable design of the thickness of the humeral stem 18 and ulna stem 22, for example, the humeral stem 18 and ulna stem 22 can be designed to be thinner for use with smaller humeral and ulna cavities; the humeral stem 18 and ulnar stem 22 can also be designed to be thicker to accommodate patients with a fracture or tumor that require a significant osteotomy or that have a significant bone defect.

In a preferred embodiment, in the case that the rotation angle of the ulna prosthesis 2 with respect to the humerus prosthesis 1 is maximized, the angle between the length direction of the ulna prosthesis 2 and the length direction of the humerus prosthesis 1 may be in the range of 10 ° to 15 °, so that the elbow joint prosthesis 100 of the present invention can satisfy the elbow joint carrying angle of the human body after replacement, thereby achieving the effect of highly emulating the elbow joint of the human body. The elbow joint lead angle is understood to mean that the upper limb arm axis of the human body is a line passing through the longitudinal axis of the humerus, the anterior arm axis being coincident with the long axis of the ulna. The intersection of the extension lines of the upper limb arm shaft and the front arm shaft forms an outwardly open angle of about 165 deg. to 170 deg., with a supplementary angle of 10 deg. to 15 deg., i.e., the range of the included angle of the length direction of the ulna prosthesis 2 and the length direction of the humerus prosthesis 1 of the elbow joint prosthesis 100 of the present invention.

In a preferred embodiment, the connection end 11 of the humerus prosthesis 1 and the connection part of the humerus stem 18 may be formed with a plurality of cambered surfaces, so that the humerus prosthesis 1 can effectively protect the bone around the humerus prosthesis 1 during the use of a patient after being connected with the humerus of the human body, so as to avoid the abrasion of the bone by the humerus prosthesis 1, and thus, the fracture phenomenon of the bone around the humerus prosthesis 1 can be effectively prevented. Preferably, the humeral prosthesis 1 can be twice machined from the square configuration of the humeral prostheses on the market into an arcuate configuration.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (9)

1. An elbow joint prosthesis, comprising: A humeral prosthesis, wherein a first lug and a second lug extending in a length direction away from the humeral prosthesis are respectively formed on opposite sides of a connecting end of the humeral prosthesis, wherein the first lug is provided with a first through hole, and the second lug is provided with a second through hole coaxial with the first through hole; an ulna prosthesis, wherein a third through hole is provided on an end of the ulna prosthesis opposite to the connecting end; and A rotating shaft assembly, the rotating shaft assembly comprising a rotating shaft, the rotating shaft is used to simultaneously pass through the first through hole, the second through hole and the third through hole to rotatably connect the humeral prosthesis with the ulna prosthesis, the first end and the second end of the rotating shaft are both configured to be able to extend and retract along the axial direction of the rotating shaft, wherein the rotating shaft is an elastic bayonet; The rotating shaft is configured to be able to extend and retract along its own axial direction, so that the rotating shaft can have an initial length in an initial state and a maximum compressed length in a compressed state, and by setting the initial length to be greater than the distance between the first through hole and the second through hole, and setting the maximum compressed length to be less than or equal to the distance between the first through hole and the second through hole, the ulnar prosthesis can be inserted between the first lug and the second lug in the area between the first lug and the second lug when the rotating shaft is at the maximum compressed length, and the rotating shaft can be connected to the first through hole and the second through hole when the rotating shaft returns to its initial length, thereby completing the connection between the ulnar prosthesis and the humeral prosthesis. 2. The elbow joint prosthesis according to claim 1 is characterized in that the shaft assembly also includes two humeral sleeves sleeved on the shaft and located between the first lug and the ulnar prosthesis, and between the second lug and the ulnar prosthesis, and the two humeral sleeves are slidably connected to the first lug and the second lug respectively. 3. The elbow joint prosthesis according to claim 2 is characterized in that first notches are formed on two opposite side surfaces of the first lug and the second lug, the first notches are respectively connected to outer edges of the first lug and the second lug, and first sliding blocks matching the first notches are respectively formed on the side surfaces of the humeral sleeve opposite to the first lug and the second lug. 4 . The elbow joint prosthesis according to claim 3 , wherein the first notch has a gradually decreasing width in a direction away from an outer edge of the first lug or the second lug. 5 . 5. The elbow joint prosthesis according to claim 3 is characterized in that second notches are formed on two opposite sides of the first lug and the second lug, the second notch is located inside the first notch or the second notch is located outside the first notch, and second sliding blocks matching the second notches are respectively formed on the sides of the humeral sleeve opposite to the first lug or the second lug. 6 . The elbow joint prosthesis according to claim 5 , wherein an expansion groove is formed at one end of the second sliding block close to the outer edge of the humeral sleeve, and the expansion groove is configured to be elastically abutted in the second notch. 7. The elbow joint prosthesis according to claim 2, characterized in that threaded holes are further formed on the first lug and the second lug, and the shaft assembly further comprises screws threadedly connected to the threaded holes for fixing the shaft and/or the humeral sleeve. 8. The elbow joint prosthesis according to claim 1, characterized in that the connecting end further includes a connecting surface connecting the first lug and the second lug, and the elbow joint prosthesis further includes a pad detachably fixed on the connecting surface, and the pad forms a spherical fit with an end of the ulna prosthesis opposite to the connecting end. 9 . The elbow joint prosthesis according to claim 1 , wherein a titanium bead sintering layer is formed on the surface of the humeral prosthesis, and a titanium bead spraying layer is formed on the surface of the ulna prosthesis.