Multifunctional elbow spacer

Abstract

The present invention provides a multifunctional elbow joint spacer, which solves problems such as unstable connection of elbow joint prostheses. It includes a humeroulnar joint bone cement body, the humeroulnar joint bone cement body corresponds to the proximal radioulnar joint bone cement body and the humeroradial joint bone cement body in pairs. A cushion layer is coated at the end of the humeroulnar joint bone cement body. The proximal radioulnar joint bone cement body and the humeroradial joint bone cement body are respectively connected with a mounting seat body through a buckling mechanism. The mounting seat body is embedded in the proximal radioulnar joint bone cement body and the humeroradial joint bone cement body and is fixed with a wear-resistant layer. The wear-resistant layer is coated on the outer side of the ends of the proximal radioulnar joint bone cement body and the humeroradial joint bone cement body. A locking mechanism is arranged between the wear-resistant layer and the mounting seat body. The present invention has the advantages of good connection stability, simple structure, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to a multifunctional elbow joint spacer. Background Art

[0002] The elbow joint is composed of the distal end of the humerus and the proximal articular surfaces of the radius and ulna. Structurally, it includes three joints, which are jointly enclosed in a joint capsule. An elbow joint prosthesis is a surgical implant used in elbow joint replacement surgery to replace the elbow joint part of a human patient. Currently, the existing elbow joint prostheses mainly consist of a humeral prosthesis, an ulnar prosthesis, an articular axis locking nail, and a bushing. The humeral prosthesis is used to connect with the humerus of the human body, the ulnar prosthesis is used to connect with the ulna of the human body, the articular axis locking nail is used to connect the ends of the humeral prosthesis and the ulnar prosthesis so that the two can rotate relative to each other to achieve the movement function of the elbow joint, and the bushing is sleeved between the humeral prosthesis and the articular axis locking nail, and between the ulnar prosthesis and the articular axis locking nail to avoid contact between metal materials. However, in actual use, the existing elbow joint has poor movement effect. In addition, after the surgery, its connection state is unstable and is prone to loosening and dislocation.

[0003] In order to solve the deficiencies of the existing technology, people have carried out long-term explorations and proposed various solutions. For example, a Chinese patent document discloses a knee joint spacer and its preparation method [202010156871.8], which includes a first bone cement main body part, a first Kirschner wire, and a first metal prosthesis contact part; the upper surface of the first metal prosthesis contact part is connected to the lower end of the first bone cement main body part; the first Kirschner wire is arranged in the middle of the first bone cement main body part and the first metal prosthesis contact part; the Spacer tibial side includes a second bone cement main body part, a second Kirschner wire, and a second metal prosthesis contact part, the upper end of the second metal prosthesis contact part is connected to the lower end of the second bone cement main body part, the second Kirschner wire is arranged inside the second bone cement main body part and the second metal prosthesis contact part, and the Spacer tibial side is also provided with a cavity structure for placing the first metal prosthesis contact part.

[0004] The above solution solves the problem of poor movement effect of the elbow joint to a certain extent, but this solution still has many deficiencies, such as unstable connection state and other problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a multifunctional elbow joint spacer with reasonable design and stable connection state for the above problems.

[0006] To achieve the above object, the present invention adopts the following technical solutions: This multifunctional elbow joint spacer includes a humeroulnar joint bone cement body, the humeroulnar joint bone cement body corresponds to the proximal radioulnar joint bone cement body and the humeroradial joint bone cement body pairwise. A cushion layer is coated at the end of the humeroulnar joint bone cement body. The proximal radioulnar joint bone cement body and the humeroradial joint bone cement body are respectively connected with a mounting seat body through a buckling mechanism. The mounting seat body is embedded in the proximal radioulnar joint bone cement body and the humeroradial joint bone cement body and is fixed with a wear-resistant layer. The wear-resistant layer is coated on the outer side of the ends of the proximal radioulnar joint bone cement body and the humeroradial joint bone cement body. A locking mechanism is arranged between the wear-resistant layer and the mounting seat body. The wear-resistant layer is opposite to the cushion layer. The wear-resistant layer is connected and fixed to the bone cement body through the mounting seat body and the locking mechanism. A buckling mechanism is arranged between the mounting seat body and the bone cement body, thereby improving the connection stability of the spacer.

[0007] In the above-mentioned multifunctional elbow joint spacer, the mounting seat body includes a conical main seat body and a sub-seat body connected to the main seat body. Installation grooves for the mounting seat body to insert and fit are opened at the ends of the proximal radioulnar joint bone cement body and the humeroradial joint bone cement body. The outer side of the main seat body has a reinforcing rib extending to the outer side of the sub-seat body, and the cross-section of the reinforcing rib is V-shaped. In the mounting seat body, the main seat body and the sub-seat body cooperate, having a large contact area and clamping stability with the bone cement body.

[0008] In the above-mentioned multifunctional elbow joint spacer, the buckling mechanism includes a buckling groove arranged on the inner side of the installation groove. The mounting seat body is installed with a buckle through a telescopic mechanism. The buckle is buckled with the buckling groove. The lower end of the mounting seat body is provided with a sealing ring made of an elastic material, and the bottom of the installation groove is provided with an annular sealing groove that is pressed and fixed with the sealing ring. The buckling mechanism can lock and fix the mounting seat body and the bone cement body. The sealing ring and the sealing groove improve the sealing performance between the end of the mounting seat body and the bottom of the installation groove.

[0009] In the above-mentioned multifunctional elbow joint spacer, the telescopic mechanism includes a telescopic cavity arranged inside the mounting seat body. The telescopic cavity is communicated with a telescopic groove arranged on the mounting seat body. The buckle is slidably installed in the telescopic groove. The telescopic cavity is communicated with a filling hole extending along the central vertical axis direction of the mounting seat body. A plurality of positioning holes communicated with the telescopic cavity are opened on the side surface of the mounting seat body. Arc-shaped positioning grooves corresponding to the positioning holes one by one are arranged on the inner side of the installation groove. The telescopic mechanism fills the filling hole and the telescopic cavity with slurry, so that the buckle is pushed out to ensure the stability of the buckling mechanism. The positioning holes and the positioning grooves cooperate to form a plurality of positioning points, avoiding the mounting seat body from shifting relative to the installation groove.

[0010] In the above-mentioned multifunctional elbow joint spacer, the locking mechanism includes a Kirschner wire connected to the wear-resistant layer, the Kirschner wire has a first locking portion and a second locking portion that are relatively bent, and a locking hole for inserting the Kirschner wire is opened at one end of the mounting seat body opposite to the wear-resistant layer, the first locking portion of the Kirschner wire is connected to the wear-resistant layer, and the second locking portion passes through the mounting seat body and extends outward relative to the mounting seat body. The Kirschner wire in the locking mechanism enables the wear-resistant layer and the mounting seat body to have better locking stability, and the Kirschner wire passes through the mounting seat body and is inserted into the bone cement body, achieving a better fixing effect.

[0011] In the above-mentioned multifunctional elbow joint spacer, the humero-ulnar joint bone cement body, the proximal radio-ulnar joint bone cement body and the humero-radial joint bone cement body respectively have a connecting seat body and a bone cement main body, a connecting frame assembly is arranged between the connecting seat body and the bone cement main body, and a covering assembly is arranged between the connecting seat body and the outer side of the bone cement main body. The connecting seat body and the bone cement main body cooperate to achieve the coordinated fixation of the bone cement body and the bone, and the outer covering assembly effectively prolongs the service life of the bone cement body.

[0012] In the above-mentioned multifunctional elbow joint spacer, the connection seat body includes a connection handle and a connection disk arranged at the end of the connection handle. The connection handle and the connection disk are integrally formed. The cross section of the connection handle is a flat arc structure and has a connection medullary pin extending outward along the axial direction. The side of the connection handle is provided with a plurality of connection holes along the axial direction. The spacing between the connection holes gradually decreases from the end of the connection handle toward the end close to the connection disk. The connection disk includes a main disk body. The side of the main disk body opposite to the connection handle is a conical structure. An arc-shaped transition portion is arranged at the intersection of the outer side of the main disk body and the connection handle. The side of the main disk body away from the connection handle is a concave structure. A connection edge surrounding the circumference is arranged at the edge of the main disk body. The width of one side of the connection edge is greater than the width of the other side. The connection handle of the connection seat body has good matching stability with the bone, which is convenient for surgical installation.

[0013] In the above-mentioned multifunctional elbow joint spacer, the connecting frame assembly includes a support frame arranged on the side opposite to the main plate body and the main part of the bone cement, the support frame is a column structure and is arranged equidistantly along the edge of the main plate body, and a plurality of through support holes are opened on the side of the support frame along the axial direction, and support bars are inserted into the support holes between the support frames, and the support bars are woven into a grid structure, and the support frame is divided into a long bracket and a short bracket, and the long bracket and the short bracket are arranged at intervals. The connecting frame assembly plays a role in stabilizing the connection of the main part of the bone cement and can provide a large tightening force.

[0014] In the above-mentioned multi-functional elbow joint placeholder, the bone cement main body includes a base directly connected to the connecting seat body and a joint body connected to the base and formed by 3D printing. The covering component includes a titanium alloy layer covering the outside of the base and the joint body. The cushion layer and the wear-resistant layer are made of polyethylene material. An adhesive layer is coated between the wear-resistant layer and the proximal radioulnar joint bone cement body and the humeroradial joint bone cement body. A limiting strip is arranged at the edge of the wear-resistant layer. Limiting grooves engaged with the limiting strip are arranged circumferentially on the outside of the proximal radioulnar joint bone cement body and the humeroradial joint bone cement body. A colloid is filled between the cushion layer and the wear-resistant layer. The adhesive layer fills the gap between the wear-resistant layer and the bone cement body to ensure its fitting effect. The limiting strip and the limiting groove are engaged, so that the edge of the wear-resistant layer has a good fixing effect with the bone cement body. The colloid has a good buffering and lubricating effect on the cushion layer and the wear-resistant layer, ensuring the flexibility of the joint. The bone cement main body uses a prefabricated base and a joint body formed by 3D printing on the base. The size specifications are selected according to needs to obtain better use comfort and meet the replacement requirements of different functional joints.

[0015] In the above-mentioned multi-functional elbow joint placeholder, grid-shaped positioning rib strips are arranged on the inner side of the cushion layer. Positioning grooves engaged with the positioning rib strips are arranged at the ends of the humeroulnar joint bone cement body. The cushion layer has a first hinge part opposite to the end of the proximal radioulnar joint bone cement body and a second hinge part opposite to the humeroradial joint bone cement body. An artificial ligament is connected between the outside of the humeroulnar joint bone cement body and the proximal radioulnar joint bone cement body and the humeroradial joint bone cement body. The end of the artificial ligament is connected and fixed to the humeroulnar joint bone cement body, the proximal radioulnar joint bone cement body and the humeroradial joint bone cement body through threaded connectors. An arc-shaped convex part is arranged on the inner side of the cushion layer. An arc-shaped concave part that fits and presses against the arc-shaped convex part is arranged at the end of the humeroulnar joint bone cement body. A cavity is left between the arc-shaped convex part and the arc-shaped concave part. The artificial ligament replaces the conventional hinge connection, so that the joint has better rotational flexibility.

[0016] Compared with the existing technology, the advantages of the present invention are as follows: The wear-resistant layer coated on the end of the bone cement body is connected to the mounting seat body through a locking mechanism, and a buckling mechanism is arranged between the mounting seat body and the bone cement body, thereby improving the installation and connection stability of the placeholder; the telescopic mechanism makes the mounting seat body and the bone cement body buckled and fixed by filling the slurry, playing a good role in sealing the gap; the bone cement main body is formed by 3D printing, and the specifications can be adjusted according to the actual situation to meet the placeholder requirements of different functional joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a structural sectional view of the bone cement main body of the present invention;

[0019] Figure 3 is a partial cross-sectional view of the bone cement main body of the present invention;

[0020] Figure 4 is a partial cross-sectional view of the bone cement main body of the present invention;

[0021] Figure 5 is a partial cross-sectional view of the humeroulnar joint bone cement body of the present invention;

[0022] Figure 6 is a structural cross-sectional view of the connecting seat body of the present invention;

[0023] In the figure, the humeroulnar joint bone cement body 1, the bone cement main body 11, the base body 12, the joint body 13, the cushion layer 14, the arc-shaped convex part 141, the arc-shaped concave part 142, the positioning rib 15, the positioning groove 16, the first hinge part 17, the second hinge part 18, the artificial ligament 19, the radioulnar proximal joint bone cement body 2, the connecting frame assembly 21, the support frame 22, the long support 221, the short support 222, the support hole 23, the support bar 24, the humeroradial joint bone cement body 3, the covering assembly 31, the buckling mechanism 4, the buckling groove 41, the buckle 42, the sealing ring 43, the sealing groove 44, the mounting seat body 5, the main seat body 51, the sub-seat body 52, the mounting groove 53, the reinforcing rib 54, the positioning hole 55, the positioning groove 56, the wear-resistant layer 6, the limiting strip 61, the limiting groove 62, the locking mechanism 7, the Kirschner wire 71, the first locking part 72, the second locking part 73, the locking hole 74, the telescopic mechanism 8, the telescopic cavity 81, the telescopic groove 82, the filling hole 83, the connecting seat body 9, the connecting handle 91, the connecting disc 92, the connecting medullary needle 93, the connecting hole 94, the main disc body 95, the arc-shaped transition part 96, the connecting edge 97. Detailed implementation manners

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0025] As Figure 1-6As shown in the figure, this multifunctional elbow joint placeholder includes a humeroulnar joint bone cement body 1. The humeroulnar joint bone cement body 1 corresponds to the proximal radioulnar joint bone cement body 2 and the humeroradial joint bone cement body 3 in pairs. A cushion layer 14 is covered at the end of the humeroulnar joint bone cement body 1. The proximal radioulnar joint bone cement body 2 and the humeroradial joint bone cement body 3 are respectively connected with a mounting seat body 5 through a buckling mechanism 4. The mounting seat body 5 is embedded in the proximal radioulnar joint bone cement body 2 and the humeroradial joint bone cement body 3 and is fixed with a wear-resistant layer 6. The wear-resistant layer 6 is covered on the outer side of the ends of the proximal radioulnar joint bone cement body 2 and the humeroradial joint bone cement body 3. A locking mechanism 7 is arranged between the wear-resistant layer 6 and the mounting seat body 5. The humeroulnar joint bone cement body 1, the proximal radioulnar joint bone cement body 2 and the humeroradial joint bone cement body 3 form the placeholder main body. A wear-resistant layer 6 that fits with it is connected at its end through the mounting seat body 5. The locking mechanism 7 realizes the locking and fixation of the wear-resistant layer 6, the mounting seat body 5 and the bone cement body.

[0026] Specifically, the mounting seat body 5 includes a conical main seat body 51 and a sub-seat body 52 connected to the main seat body 51. Installation grooves 53 for the insertion and fitting of the mounting seat body 5 are opened at the ends of the proximal radioulnar joint bone cement body 2 and the humeroradial joint bone cement body 3. The outer side of the main seat body 51 has a reinforcing rib 54 extending to the outer side of the sub-seat body 52, and the cross-section of the reinforcing rib 54 is V-shaped. The main seat body 51 and the sub-seat body 52 are integrally connected, and the reinforcing ribs 54 on its outer side are symmetrically arranged relative to its center.

[0027] Furthermore, the buckling mechanism 4 includes a buckling groove 41 arranged on the inner side of the installation groove 53. The mounting seat body 5 is installed with a buckle 42 through a telescopic mechanism 8. The buckle 42 is buckled with the buckling groove 41. A sealing ring 43 made of elastic material is arranged at the lower end of the mounting seat body 5, and an annular sealing groove 44 for pressing and fixing with the sealing ring 43 is arranged at the bottom of the installation groove 53. The buckle 42 extends out of the mounting seat body 5 and is buckled with the buckling groove 41 to realize the connection and locking of the mounting seat body 5 and the installation groove 53. The sealing ring 43 and the sealing groove 44 at its end realize the sealing of its connection.

[0028] Further, the telescopic mechanism 8 includes a telescopic cavity 81 arranged inside the mounting seat body 5. The telescopic cavity 81 is communicated with a telescopic groove 82 arranged on the mounting seat body 5. The buckle 42 is slidably installed in the telescopic groove 82. The telescopic cavity 81 is communicated with a filling hole 83 extending along the central vertical axis direction of the mounting seat body 5. A plurality of positioning holes 55 communicated with the telescopic cavity 81 are opened on the side surface of the mounting seat body 5. Arc-shaped positioning grooves 56 corresponding to the positioning holes 55 one by one are arranged on the inner side of the installation groove 53. The telescopic cavity 81 of the telescopic mechanism 8 is filled with slurry, so that the buckle 42 is ejected. At the same time, the slurry seeping out at the gap is condensed to further improve the fixing and sealing effects. The slurry is filled between the positioning holes 55 and the positioning grooves 56 and forms a plurality of positioning nodes after condensation to prevent the mounting seat body 5 from loosening and misaligning relative to the installation groove 53.

[0029] In addition, the locking mechanism 7 includes a Kirschner wire 71 connected to the wear-resistant layer 6. The Kirschner wire 71 has a first locking portion 72 and a second locking portion 73 that are bent relative to each other. One end of the mounting seat body 5 opposite to the wear-resistant layer 6 is provided with a locking hole 74 for inserting the Kirschner wire 71. The first locking portion 72 of the Kirschner wire 71 is connected to the wear-resistant layer 6, and the second locking portion 73 passes through the mounting seat body 5 and extends outward relative to the mounting seat body 5. The Kirschner wire 71 in the locking mechanism 7 is fixedly connected to the wear-resistant layer 6, passes through the locking hole 74 of the mounting seat body 5, and realizes the locking and fixing of the wear-resistant layer 6 and the mounting seat body 5. The first locking portion 72 and the second locking portion 73 of the Kirschner wire 71 are bent relative to each other and are fixedly connected after being inserted into the bone cement body.

[0030] Furthermore, the humeroulnar joint bone cement body 1, the proximal radioulnar joint bone cement body 2, and the humeroradial joint bone cement body 3 respectively have a connecting seat body 9 and a bone cement main body portion 11. A connecting frame assembly 21 is provided between the connecting seat body 9 and the bone cement main body portion 11, and a covering assembly 31 is provided between the outside of the connecting seat body 9 and the bone cement main body portion 11. The bone cement main body portion 11 cooperates with the connecting frame assembly 21 to form the humeroulnar joint bone cement body 1, the proximal radioulnar joint bone cement body 2, and the humeroradial joint bone cement body 3. The equipped covering assembly 31 plays a protective role on the outside of the bone cement body.

[0031] At the same time, the connecting seat body 9 includes a connecting handle 91 and a connecting disk 92 provided at the end of the connecting handle 91. The connecting handle 91 and the connecting disk 92 are integrally formed. The cross-section of the connecting handle 91 is in a flat arc structure and has a connecting medullary needle 93 extending outward along the axis. A plurality of connecting holes 94 are provided on the side surface of the connecting handle 91 along the axis. The distance between the connecting holes 94 gradually decreases from the end of the connecting handle 91 towards the end close to the connecting disk 92. The connecting disk 92 includes a main disk body 95. The side of the main disk body 95 opposite to the connecting handle 91 is in a conical structure. An arc transition portion 96 is provided at the junction of the outside of the main disk body 95 and the connecting handle 91. The side of the main disk body 95 away from the connecting handle 91 is in a concave structure. A connecting edge 97 surrounding the circumference is provided at the edge of the main disk body 95. The width of one side of the connecting edge 97 is greater than that of the other side. The connecting handle 91 fits or is inserted into the bone, and the connecting holes 94 on its side surface are relatively fixed to the bone through connecting pieces. The connecting medullary needle 93 passes through the bone, and the connecting disk 92 therein is used to connect to the bone cement main body portion 11, and a suitable bone cement main body portion 11 is prefabricated as needed.

[0032] Visibly, the connecting frame assembly 21 includes a support frame 22 disposed on the side of the main disk body 95 opposite to the bone cement main body 11. The support frame 22 is of a column structure and is arranged equidistantly along the edge of the main disk body 95. A plurality of through support holes 23 are formed in the side surface of the support frame 22 in the axial direction. A support bar 24 is inserted into the support holes 23 between the support frames 22. The support bar 24 is woven into a grid structure. The support frame 22 is divided into a long support frame 221 and a short support frame 222, and the long support frame 221 and the short support frame 222 are arranged at intervals. The support frame 22 is fixed to the main disk body 95, is evenly arranged near the edge of the main disk body 95, is inserted into the bone cement main body 11, and the contact area and connection nodes with the bone cement main body 11 are increased through the grid woven by the support bar 24, thereby preventing the bone cement main body 11 from loosening and separating from the main disk body 95.

[0033] Obviously, the bone cement main body 11 includes a base body 12 directly connected to the connecting seat body 9 and a joint body 13 connected to the base body 12 and formed by 3D printing. The coating assembly 31 includes a titanium alloy layer covering the outer sides of the base body 12 and the joint body 13. The cushion layer 14 and the wear-resistant layer 6 are made of polyethylene material. An adhesive layer is coated between the wear-resistant layer 6 and the proximal radioulnar joint bone cement body 2 and the humeroradial joint bone cement body 3. A limiting strip 61 is provided at the edge of the wear-resistant layer 6. Limiting grooves 62 engaged with the limiting strip 61 are arranged circumferentially on the outer sides of the proximal radioulnar joint bone cement body 2 and the humeroradial joint bone cement body 3. A colloid is filled between the cushion layer 14 and the wear-resistant layer 6. An adhesive layer is provided inside the wear-resistant layer 6, which maintains a high degree of fitting tightness with the bone cement body and simultaneously plugs the filling hole 83. The combination of the limiting strip 61 and the limiting groove 62 prevents the wear-resistant layer 6 from separating after long-term use. The colloid serves as a joint filler to ensure the lubricity between the cushion layer 14 and the wear-resistant layer 6, enabling the humeroulnar joint bone cement body 1 to rotate flexibly relative to the proximal radioulnar joint bone cement body 2 and the humeroradial joint bone cement body 3. The joint body 13 is formed by 3D printing on the base body 12 of the bone cement main body 11, and then the base body 12 is connected to the main disk body 95. The titanium alloy layer has good affinity with the body tissue. The cushion layer 14 and the wear-resistant layer 6 made of polyethylene material have a long service life and lubricity, and the colloid therebetween realizes buffering.

[0034] Preferably, a grid-shaped positioning rib 15 is provided inside the cushion layer 14. A positioning groove 16 that meshes with the positioning rib 15 is provided at the end of the humeroulnar joint bone cement body 1. The cushion layer 14 has a first hinge portion 17 opposite to the end of the proximal radioulnar joint bone cement body 2 and a second hinge portion 18 opposite to the humeroradial joint bone cement body 3. An artificial ligament 19 is connected between the outside of the humeroulnar joint bone cement body 1, the proximal radioulnar joint bone cement body 2, and the humeroradial joint bone cement body 3. The end of the artificial ligament 19 is connected and fixed to the humeroulnar joint bone cement body 1, the proximal radioulnar joint bone cement body 2, and the humeroradial joint bone cement body 3 through a threaded connector. An arc-shaped convex portion 141 is provided inside the cushion layer 14. An arc-shaped concave portion 142 that fits and presses against the arc-shaped convex portion 141 is provided at the end of the humeroulnar joint bone cement body 1. A cavity is left between the arc-shaped convex portion 141 and the arc-shaped concave portion 142. The cushion layer 14 is connected to the humeroulnar joint bone cement body 1. Its first hinge portion 17 and second hinge portion 18 achieve joint movable connection. The artificial ligament 19 on the outside replaces the original hinge shaft, and it imitates the normal movement of the human elbow joint to reduce the discomfort during use.

[0035] In summary, the principle of this embodiment is as follows: The wear-resistant layer 6 is opposite to the cushion layer 14. The wear-resistant layer 6 is connected and fixed to the bone cement body through the mounting seat body 5 and the locking mechanism 7. A buckling mechanism 4 is provided between the mounting seat body 5 and the bone cement body, thereby improving the connection stability of the placeholder.

[0036] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0037] Although the terms such as the humeroulnar joint bone cement body 1, the bone cement main body 11, the matrix 12, the joint body 13, the cushion layer 14, the arc-shaped convex part 141, the arc-shaped concave part 142, the positioning rib 15, the positioning groove 16, the first hinge part 17, the second hinge part 18, the artificial ligament 19, the proximal radioulnar joint bone cement body 2, the connecting frame assembly 21, the support frame 22, the long support 221, the short support 222, the support hole 23, the support bar 24, the humeroradial joint bone cement body 3, the covering assembly 31, the fastening mechanism 4, the fastening groove 41, the fastening buckle 42, the sealing ring 43, the sealing groove 44, the mounting seat body 5, the main seat body 51, the auxiliary seat body 52, the mounting groove 53, the reinforcing rib 54, the positioning hole 55, the positioning groove 56, the wear-resistant layer 6, the limiting strip 61, the limiting groove 62, the locking mechanism 7, the Kirschner wire 71, the first locking part 72, the second locking part 73, the locking hole 74, the telescopic mechanism 8, the telescopic cavity 81, the telescopic groove 82, the filling hole 83, the connecting seat body 9, the connecting handle 91, the connecting disc 92, the connecting medullary needle 93, the connecting hole 94, the main disc body 95, the arc-shaped transition part 96, the connecting edge 97, etc. are used more frequently in this article, it does not exclude the possibility of using other terms. The use of these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A multifunctional elbow joint spacer, comprising a humeroulnar joint bone cement body (1), the humeroulnar joint bone cement body (1) corresponding to the proximal radioulnar joint bone cement body (2) and the humeroradial joint bone cement body (3) pairwise, characterized in that, The end of the humeroulnar joint bone cement body (1) is covered with a cushion layer (14). The proximal radioulnar joint bone cement body (2) and the humeroradial joint bone cement body (3) are respectively connected with a mounting seat body (5) through a buckling mechanism (4). The mounting seat body (5) is embedded in the proximal radioulnar joint bone cement body (2) and the humeroradial joint bone cement body (3) and is fixed with a wear-resistant layer (6). The wear-resistant layer (6) covers the outside of the ends of the proximal radioulnar joint bone cement body (2) and the humeroradial joint bone cement body (3). A locking mechanism (7) is arranged between the wear-resistant layer (6) and the mounting seat body (5). The mounting seat body (5) includes a conical main seat body (51) and a sub-seat body (52) connected to the main seat body (51). The ends of the proximal radioulnar joint bone cement body (2) and the humeroradial joint bone cement body (3) are provided with a mounting groove (53) for the mounting seat body (5) to insert and fit with. The outside of the main seat body (51) has a reinforcing rib (54) extending to the outside of the sub-seat body (52), and the cross section of the reinforcing rib (54) is V-shaped. The buckling mechanism (4) includes a buckling groove (41) arranged on the inner side of the mounting groove (53). The mounting seat body (5) is installed with a buckle (42) through a telescopic mechanism (8). The buckle (42) is buckled with the buckling groove (41). The lower end of the mounting seat body (5) is provided with a sealing ring (43) made of elastic material, and the bottom of the mounting groove (53) is provided with a sealing groove (44) which is annular and is pressed and fixed with the sealing ring (43). The telescopic mechanism (8) includes a telescopic cavity (81) arranged inside the mounting seat body (5). The telescopic cavity (81) is communicated with a telescopic groove (82) arranged on the mounting seat body (5). The buckle (42) is slidably installed in the telescopic groove (82). The telescopic cavity (81) is communicated with a filling hole (83) extending along the central vertical axis direction of the mounting seat body (5). The side of the mounting seat body (5) is provided with a plurality of positioning holes (55) communicated with the telescopic cavity (81). The inner side of the mounting groove (53) is provided with positioning grooves (56) which are in one-to-one correspondence with the positioning holes (55) and are arc-shaped. The locking mechanism (7) includes a Kirschner wire (71) connected with the wear-resistant layer (6). The Kirschner wire (71) has a first locking part (72) and a second locking part (73) which are bent relatively. The end of the mounting seat body (5) opposite to the wear-resistant layer (6) is provided with a locking hole (74) for the Kirschner wire (71) to insert. The first locking part (72) of the Kirschner wire (71) is connected with the wear-resistant layer (6), and the second locking part (73) passes through the mounting seat body (5) and extends outwards relative to the mounting seat body (5).The humeroulnar joint bone cement body (1), the proximal radioulnar joint bone cement body (2), and the humeroradial joint bone cement body (3) respectively have connecting seat bodies (9) and bone cement main body parts (11). A connecting frame assembly (21) is provided between the connecting seat body (9) and the bone cement main body part (11), and a covering assembly (31) is provided between the outer sides of the connecting seat body (9) and the bone cement main body part (11).; 2. The multifunctional elbow joint spacer according to claim 1, characterized in that, The connecting seat body (9) comprises a connecting handle (91) and a connecting disk (92) arranged at the end of the connecting handle (91), the connecting handle (91) and the connecting disk (92) being integrally formed, the connecting handle (91) having a flat arc-shaped cross-section and having a connecting medullary pin (93) extending outwardly along the axial direction, a plurality of connecting holes (94) being formed on the side surface of the connecting handle (91) along the axial direction, the spacing of the connecting holes (94) increasing from the end of the connecting handle (91) toward a portion close to the connecting disk (92). The connecting disk (92) comprises a main disk body (95), the side of the main disk body (95) opposite to the connecting handle (91) presents a conical structure, an arc-shaped transition portion (96) is provided at the junction of the outer side of the main disk body (95) and the connecting handle (91), the side of the main disk body (95) away from the connecting handle (91) presents a concave structure, and a connecting edge (97) surrounding the circumference is provided at the edge of the main disk body (95), and the width of one side of the connecting edge (97) is greater than the width of the other side.

3. The multifunctional elbow joint spacer according to claim 2, characterized in that, The connecting frame assembly (21) comprises a support frame (22) arranged on a side of the main plate body (95) opposite to the bone cement main body (11); the support frame (22) is a column structure and is arranged equidistantly along the edge of the main plate body (95); a plurality of through support holes (23) are opened on the side of the support frame (22) along the axial direction; support bars (24) are inserted into the support holes (23) between the support frames (22); the support bars (24) are woven into a grid structure; the support frame (22) is divided into a long bracket (221) and a short bracket (222); the long bracket (221) and the short bracket (222) are arranged at intervals.

4. The multifunctional elbow joint spacer according to claim 1, characterized in that, The bone cement main body (11) comprises a base (12) directly connected to the connection seat body (9) and a joint body (13) connected to the base (12) and formed by 3D printing. The coating component (31) comprises a titanium alloy layer covering the outside of the base (12) and the joint body (13). The cushion layer (14) and the wear-resistant layer (6) are made of polyethylene material. An adhesion layer is coated between the wear-resistant layer (6) and the proximal radioulnar joint bone cement body (2) and the humeroradial joint bone cement body (3). A limiting strip (61) is arranged at the edge of the wear-resistant layer (6). The proximal radioulnar joint bone cement body (2) and the humeroradial joint bone cement body (3) are provided with a limiting groove (62) that is engaged with the limiting strip (61) along the circumferential direction on the outside of the proximal radioulnar joint bone cement body (2) and the humeroradial joint bone cement body (3). A colloid is filled between the cushion layer (14) and the wear-resistant layer (6).

5. The multifunctional elbow joint spacer according to claim 1, characterized in that, A grid-shaped positioning rib (15) is arranged inside the cushion layer (14). A positioning groove (16) engaged with the positioning rib (15) is arranged at the end of the humeroulnar joint bone cement body (1). The cushion layer (14) has a first hinge part (17) opposite to the end of the proximal radioulnar joint bone cement body (2) and a second hinge part (18) opposite to the humeroradial joint bone cement body (3). An artificial ligament (19) is connected between the outer side of the humeroulnar joint bone cement body (1) and the proximal radioulnar joint bone cement body (2) and the humeroradial joint bone cement body (3). The end of the artificial ligament (19) is connected and fixed to the humeroulnar joint bone cement body (1), the proximal radioulnar joint bone cement body (2), and the humeroradial joint bone cement body (3) through a threaded connector. An arc-shaped convex part (141) is arranged inside the cushion layer (14). An arc-shaped concave part (142) that fits and presses against the arc-shaped convex part (141) is arranged at the end of the humeroulnar joint bone cement body (1). A cavity is left between the arc-shaped convex part (141) and the arc-shaped concave part (142).

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