Wrist joint and metacarpophalangeal joint combined prosthesis with flexion and extension function

Abstract

The utility model relates to a wrist joint and metacarpophalangeal joint combined prosthesis with a flexion and extension activity function, which belongs to the technical field of medical prostheses and is characterized in that a wrist joint prosthesis is connected with a radius, a metacarpophalangeal bone prosthesis is respectively connected with the wrist joint prosthesis and a plurality of hinge type finger joint prostheses, and each hinge type finger joint prosthesis is connected with a proximal phalanx; the wrist joint prosthesis has a rotating function, meanwhile, the wrist joint prosthesis is rotationally connected with the metacarpal bone prosthesis to achieve the flexion and extension function of the wrist-metacarpal joint, the hinge type finger joint prosthesis comprises two flexion and extension parts, and the two flexion and extension parts are rotationally connected to achieve the flexion and extension motion function of the finger joint. A plurality of suture holes are formed in the metacarpal bone prosthesis and used for being connected with tendons, so that the activity of rotation movement and flexion and extension movement of the combined prosthesis is guaranteed through the tendons.

Description

Technical Field

[0001] This utility model belongs to the field of medical prosthesis technology, specifically relating to a combined wrist and metacarpophalangeal joint prosthesis with flexion and extension functions. Background Technology

[0002] When a natural joint loses all or part of its function due to surface wear, injury, or defects, an artificial prosthesis can be implanted to replace the functional loss. As a mobile joint, it needs to balance mobility and fixation, which poses a challenge to the design of the prosthesis. In particular, when there are varying degrees of defects in the distal radius and ulna, carpal bones, metacarpal bones, phalanges, or radiocarpal joints, carpometacarpal joints, or metacarpophalangeal joints, a combined prosthesis with flexion and extension functions is required. Utility Model Content

[0003] To address the aforementioned problems in the prior art, this invention provides a combined wrist and metacarpophalangeal joint prosthesis with flexion-extension functionality. The technical problem to be solved by this invention is achieved through the following technical solution:

[0004] This invention provides a combined wrist and metacarpophalangeal joint prosthesis with flexion-extension function, comprising: a wrist joint prosthesis, a metacarpal prosthesis, and a hinged finger joint prosthesis connected in sequence; the wrist joint prosthesis includes: a radial connection portion and a metacarpal connection portion, the proximal end of the radial connection portion connecting to the radius, and the distal end of the metacarpal connection portion connecting to the metacarpal prosthesis, and the radial connection portion and the metacarpal prosthesis can rotate relative to each other through the metacarpal connection portion; the distal end of the radial connection portion rotatably connects to the proximal end of the metacarpal connection portion; the metacarpal prosthesis includes: a proximal connection portion and a distal connection portion, the proximal end of the proximal connection portion connecting to the metacarpal bone. The distal end of the connector has several distal connectors arranged in a fan-shaped interval, and the proximal ends of several distal connectors are all connected to the distal ends of the proximal connectors; the proximal connectors are provided with several suture holes for connecting tendons; there are several hinged finger joint prostheses, each of which includes a third flexor-extension part and a fourth flexor-extension part, the proximal end of the fourth flexor-extension part being rotatably connected to the distal end of the third flexor-extension part; the proximal ends of several third flexor-extension parts are connected one-to-one to the distal ends of several distal connectors, and the distal ends of several fourth flexor-extension parts are connected one-to-one to several proximal phalanges.

[0005] In one embodiment of the present invention, the radial bone connection portion includes: a medullary needle portion and a first flexor-extensor portion, wherein the medullary needle portion is needle-shaped and its diameter gradually decreases from the distal end to the proximal end; the proximal end of the medullary needle portion is connected to the medullary cavity of the radius, and the distal end is fixedly connected to the proximal end of the first flexor-extensor portion.

[0006] In one embodiment of this utility model, the metacarpal connecting portion includes: a second flexion-extension portion, a first rotation portion, and a metacarpal connecting seat; the proximal end of the second flexion-extension portion is rotatably connected to the distal end of the first flexion-extension portion via a bolt shaft; the distal end of the second flexion-extension portion is connected to the proximal end of the first rotation portion, the distal end of the first rotation portion is coaxially rotatably connected to the proximal end of the metacarpal connecting seat, and the distal end of the metacarpal connecting seat is connected to the proximal end of the proximal connecting portion; wherein, the first flexion-extension portion and the second flexion-extension portion rotate about a second direction as the axis of rotation, and the first rotation portion and the metacarpal connecting seat rotate about a first direction as the axis of rotation, and the first direction and the second direction intersect each other.

[0007] In one embodiment of the present invention, a transition platform is provided on the first rotating part, and the far end of the transition platform is in contact with the proximal end of the proximal connecting part.

[0008] In one embodiment of this utility model, the metacarpal connector is a cylinder, and a cylindrical groove is provided at the proximal end of the proximal connector, and the distal end of the metacarpal connector cooperates with the cylindrical groove.

[0009] In one embodiment of this utility model, the distal end of the metacarpal connecting seat is threadedly connected to the cylindrical groove of the proximal connecting portion.

[0010] In one embodiment of this utility model, the distal end of the third flexure portion and the proximal end of the fourth flexure portion are both disc-shaped, and the distal end of the third flexure portion and the proximal end of the fourth flexure portion are coaxially arranged and rotatably connected by a bolt shaft.

[0011] In one embodiment of this utility model, the proximal end of the third flexion-extension portion is needle-shaped, and the diameter gradually decreases from the distal end to the proximal end.

[0012] In one embodiment of this utility model, the proximal end of the fourth flexor-extensor portion is needle-shaped, and its diameter gradually decreases from the proximal end to the distal end, connecting to the medullary cavity of the proximal phalanx.

[0013] In one embodiment of this utility model, the wrist joint prosthesis, metacarpal prosthesis, and hinged finger joint prosthesis all conform to the physiological curvature of the human body.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention relates to a combined wrist and metacarpophalangeal joint prosthesis with flexion-extension functions. The wrist joint prosthesis connects to the radius, while the metacarpal prostheses connect to the wrist joint prosthesis and several hinged finger joint prostheses, each connected to a proximal phalanx. The wrist joint prosthesis has rotational capabilities and simultaneously connects to the metacarpal prostheses to achieve flexion-extension of the wrist-metacarpal joint. The hinged finger joint prostheses include two flexion-extension sections, which are rotatably connected to achieve flexion-extension of the finger joint. Several suture holes are provided on the metacarpal prostheses for connecting tendons, ensuring the rotational and flexion-extension mobility of the combined prosthesis.

[0016] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a combined wrist and metacarpophalangeal joint prosthesis with flexion and extension functions provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the radial connection portion provided in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the metacarpal connection portion provided in an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of the hinge-type finger joint prosthesis provided in this embodiment of the utility model.

[0021] Icons: 100 - Wrist joint prosthesis; 110 - Radial connection; 111 - Medullary pin; 112 - First flexor / extension section; 120 - Metacarpal connection; 121 - Second flexor / extension section; 122 - First rotator section; 123 - Metacarpal connector; 200 - Metacarpal prosthesis; 210 - Proximal connection; 211 - Suture hole; 220 - Distal connection; 300 - Hinge-type finger joint prosthesis; 310 - Third flexor / extension section; 320 - Fourth flexor / extension section. Detailed Implementation

[0022] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, describes a wrist joint and metacarpophalangeal joint combined prosthesis with flexion and extension functions proposed according to this utility model.

[0023] The foregoing and other technical contents, features, and effects of this utility model will be clearly presented in the following detailed description of the specific embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding can be gained of the technical means and effects adopted by this utility model to achieve the intended purpose. However, the accompanying drawings are only provided for reference and illustration and are not intended to limit the technical solution of this utility model.

[0024] Example 1

[0025] like Figure 1 As shown, this utility model provides a combined wrist and metacarpophalangeal joint prosthesis with flexion-extension function, comprising: a wrist joint prosthesis 100, a metacarpal prosthesis 200, and a hinged finger joint prosthesis 300 connected in sequence. The wrist joint prosthesis 100 serves as an implant to perform the function of the wrist-metacarpal joint, thus possessing degrees of freedom in flexion-extension and rotation. The metacarpal prosthesis 200 serves as an implant to perform the function of the metacarpal bone. Several hinged finger joint prostheses 300 are provided, each correspondingly connected to a metacarpal prosthesis 200 and a proximal phalanx, and each hinged finger joint prosthesis 300 also possesses degrees of freedom in flexion-extension to perform the function of the metacarpophalangeal joint. Furthermore, several suture holes 211 are provided at the proximal end of the metacarpal prosthesis 200 for connecting tendons and transmitting force through the tendons, thereby ensuring the mobility of the combined prosthesis in rotation and flexion-extension movements.

[0026] It should be noted that, for ease of understanding, the relative relationship between the combined prosthesis and the human bone structure is represented by proximal and distal ends. The proximal end is the end closer to the heart or the center of the trunk, and the distal end is the end relatively farther away from the heart or the center of the trunk.

[0027] In this embodiment, as Figures 1 to 3 As shown, the wrist joint prosthesis 100 includes a radial connection portion 110 and a metacarpal connection portion 120. The proximal end of the radial connection portion 110 is connected to the radius, and the distal end of the metacarpal connection portion 120 is connected to the metacarpal prosthesis 200. The radial connection portion 110 and the metacarpal prosthesis 200 can rotate relative to each other through the metacarpal connection portion 120. The distal end of the radial connection portion 110 is rotatably connected to the proximal end of the metacarpal connection portion 120.

[0028] In one alternative implementation, such as Figure 1 and Figure 2 As shown, the radial connection portion 110 includes a medullary needle portion 111 and a first flexor-extensor portion 112, wherein the medullary needle portion 111 is needle-shaped and its diameter gradually decreases from the distal end to the proximal end; the proximal end of the medullary needle portion 111 is connected to the medullary canal of the radius, and the distal end is fixedly connected to the proximal end of the first flexor-extensor portion 112.

[0029] In one alternative implementation, such as Figures 1 to 3 As shown, the metacarpal connecting portion 120 includes: a second flexion-extension portion 121, a first rotation portion 122, and a metacarpal connecting seat 123; the proximal end of the second flexion-extension portion 121 is rotatably connected to the distal end of the first flexion-extension portion 112 via a bolt shaft; the distal end of the second flexion-extension portion 121 is connected to the proximal end of the first rotation portion 122, the distal end of the first rotation portion 122 is coaxially rotatably connected to the proximal end of the metacarpal connecting seat 123, and the distal end of the metacarpal connecting seat 123 is connected to the proximal end of the proximal connecting portion 210; wherein, the first flexion-extension portion 112 and the second flexion-extension portion 121 rotate about a second direction as the axis of rotation, and the first rotation portion 122 and the metacarpal connecting seat 123 rotate about a first direction as the axis of rotation, and the first direction and the second direction intersect each other.

[0030] For example, the first bending and extending portion 112 and the second bending and extending portion 121 are hinge structures, and through connecting holes are provided on the first bending and extending portion 112 and the second bending and extending portion 121 respectively, and the first bending and extending portion 112 and the second bending and extending portion 121 are connected as one unit by through bolt shaft.

[0031] The principle is as follows: the radial connecting part 110 is used to connect the radius, and a needle-shaped medullary needle part 111 is provided at the proximal end of the radial connecting part 110 and inserted into the medullary cavity of the radius; the metacarpal connecting part 120 is used to connect the metacarpal prosthesis 200, and the first flexion-extension part 112 of the radial connecting part 110 and the second flexion-extension part 121 of the metacarpal connecting part 120 are rotatably connected to realize the flexion and extension function of the wrist-metacarpal joint. At the same time, the first rotation part 122 of the metacarpal connecting part 120 itself and the metacarpal connecting seat 123 can also rotate relative to each other to realize the rotation function of the wrist-metacarpal joint. Generally, the rotational movement of the wrist-metacarpal joint is different from the flexion-extension movement. Therefore, the rotation axis is set along the first direction and the second direction respectively, and the first direction and the second direction intersect each other. Since the human body has body dimensions, the intersection angle between the first direction and the second direction is set according to the actual situation. In this embodiment, it is not limited.

[0032] In this embodiment, as Figure 1 and Figure 3 As shown, the metacarpal prosthesis 200 includes a proximal connecting portion 210 and a distal connecting portion 220. The proximal end of the proximal connecting portion 210 is connected to the distal end of the metacarpal connecting portion 120. Several distal connecting portions 220 are distributed in a fan-shaped interval, and the proximal ends of several distal connecting portions 220 are all connected to the distal end of the proximal connecting portion 210. The proximal connecting portion 210 is provided with several suture holes 211 for connecting tendons.

[0033] In an optional embodiment, a transition platform is provided on the first rotating part 122, and the far end of the transition platform is in contact with the proximal end of the proximal end connecting part 210, that is, the transition is achieved at the proximal end of the proximal end connecting part 210 by means of the transition platform.

[0034] For example, the metacarpal connector 123 is a cylinder, and a cylindrical groove is provided at the proximal end of the proximal connecting portion 210. The distal end of the metacarpal connector 123 mates with the cylindrical groove. Furthermore, to improve the reliability of the connection, the distal end of the metacarpal connector 123 is threadedly connected to the cylindrical groove of the proximal connecting portion 210.

[0035] The principle is as follows: the metacarpal prosthesis 200 includes a proximal connecting part 210 and a distal connecting part 220. The proximal connecting part 210 is connected to the wrist joint prosthesis 100. Several distal connecting parts 220 are used to connect several hinged finger joint prostheses 300, and the hinged finger joint prostheses 300 undertake the function of the metacarpophalangeal joint. Therefore, the distal connecting part 220 is a biomimetic metacarpal structure. Each distal connecting part 220 extends from the proximal end to the distal end, and there is a certain angle between two adjacent distal connecting parts 220 to form a fan-shaped biomimetic metacarpal structure.

[0036] It is worth noting that, in addition to the degrees of freedom of flexion-extension and rotation, the wrist and metacarpophalangeal joint combined prosthesis with flexion-extension function in this embodiment achieves transmission via tendons by providing a plurality of suture holes 211 on the proximal connecting portion 210. For example, the plurality of suture holes 211 are spaced apart, with three on the inner side and two on the outer side of the proximal connecting portion 210, located at the reconstructed tendon insertion points of each tendon. Each suture hole 211 has a progressive opening design, and each suture hole 211 penetrates the proximal connecting portion 210. The opening size of both the inlet and outlet is larger than the middle connecting portion, and the edges of the inlet and outlet are surface-treated to make them smooth. Furthermore, the diameter of the middle connecting portion of each suture hole 211 is 3 mm, and the distance between any two adjacent suture holes 211 is at least 5 mm.

[0037] In this embodiment, as Figure 1 and Figure 4 As shown, there are several hinged finger joint prostheses 300. Each hinged finger joint prosthesis 300 includes a third flexor-extension portion 310 and a fourth flexor-extension portion 320. The proximal end of the fourth flexor-extension portion 320 is rotatably connected to the distal end of the third flexor-extension portion 310. The proximal ends of several third flexor-extension portions 310 are connected one-to-one to the distal ends of several distal connecting portions 220, and the distal ends of several fourth flexor-extension portions 320 are connected one-to-one to several proximal phalanges.

[0038] For example, both the distal connection portion 220 and the hinged finger joint prosthesis 300 are provided with four parts, corresponding to the four fingers other than the thumb.

[0039] In an optional embodiment, the distal end of the third flexor-extension portion 310 and the proximal end of the fourth flexor-extension portion 320 are both disc-shaped, and the distal end of the third flexor-extension portion 310 and the proximal end of the fourth flexor-extension portion 320 are coaxially arranged and rotatably connected by a bolt shaft. For example, the proximal end of the third flexor-extension portion 310 is needle-shaped, with its diameter gradually decreasing from the distal end to the proximal end; the proximal end of the fourth flexor-extension portion 320 is needle-shaped, with its diameter gradually decreasing from the proximal end to the distal end, and connects to the medullary cavity of the proximal phalanx.

[0040] The principle is that the hinged finger joint prosthesis 300 is used to assume the function of the metacarpophalangeal joint. The proximal end of the third flexor-extension part 310 is inserted into the distal end of the distal connecting part 220, and the proximal end of the fourth flexor-extension part 320 is inserted into the medullary cavity of the proximal phalanx. The distal end of the third flexor-extension part 310 and the proximal end of the fourth flexor-extension part 320 form a hinge structure and are rotated by a bolt shaft.

[0041] It is worth noting that, as implants, the wrist joint prosthesis 100, the metacarpal prosthesis 200, and the hinged finger joint prosthesis 300 are all biomimetic structures and conform to the physiological curvature of the human body. For example, the wrist joint prosthesis 100, the metacarpal prosthesis 200, and the hinged finger joint prosthesis 300 are all made of titanium alloy, with the surface coated with vacuum titanium paste, and the movable connection parts are all polished.

[0042] This invention relates to a combined wrist and metacarpophalangeal joint prosthesis with flexion-extension functions. The wrist joint prosthesis connects to the radius, while the metacarpal prostheses connect to the wrist joint prosthesis and several hinged finger joint prostheses, each connected to a proximal phalanx. The wrist joint prosthesis has rotational capabilities and simultaneously connects to the metacarpal prostheses to achieve flexion-extension of the wrist-metacarpal joint. The hinged finger joint prostheses include two flexion-extension sections, which are rotatably connected to achieve flexion-extension of the finger joint. Several suture holes are provided on the metacarpal prostheses for connecting tendons, ensuring the rotational and flexion-extension mobility of the combined prosthesis.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not expressly listed. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device comprising said element. Terms such as "connected" or "linked" are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect. The orientations or positional relationships indicated by terms such as "upper," "lower," "left," and "right" are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0044] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A combined wrist and metacarpophalangeal joint prosthesis with flexion-extension function, characterized in that, include: A wrist joint prosthesis (100), a metacarpal prosthesis (200), and a hinged finger joint prosthesis (300) are connected in sequence. The wrist joint prosthesis (100) includes a radial connection portion (110) and a metacarpal connection portion (120). The proximal end of the radial connection portion (110) is connected to the radius, and the distal end of the metacarpal connection portion (120) is connected to the metacarpal prosthesis (200). The radial connection portion (110) and the metacarpal prosthesis (200) are rotatable relative to each other through the metacarpal connection portion (120). The distal end of the radial connection portion (110) is rotatably connected to the proximal end of the metacarpal connection portion (120). The metacarpal prosthesis (200) includes a proximal connecting portion (210) and a distal connecting portion (220). The proximal end of the proximal connecting portion (210) is connected to the distal end of the metacarpal connecting portion (120). A plurality of distal connecting portions (220) are arranged in a fan-shaped interval, and the proximal ends of the plurality of distal connecting portions (220) are all connected to the distal end of the proximal connecting portion (210). The proximal connecting portion (210) is provided with a plurality of suture holes (211) for connecting tendons. There are several hinged finger joint prostheses (300), each of which includes a third flexor / extension portion (310) and a fourth flexor / extension portion (320). The proximal end of the fourth flexor / extension portion (320) is rotatably connected to the distal end of the third flexor / extension portion (310). The proximal ends of several third flexor / extension portions (310) are connected one-to-one to the distal ends of several distal connecting portions (220), and the distal ends of several fourth flexor / extension portions (320) are connected one-to-one to several proximal phalanges.

2. The wrist joint and metacarpophalangeal joint combined prosthesis with flexion-extension function according to claim 1, characterized in that, The radial connection portion (110) includes a medullary needle portion (111) and a first flexor-extension portion (112), wherein the medullary needle portion (111) is needle-shaped and its diameter gradually decreases from the distal end to the proximal end; the proximal end of the medullary needle portion (111) is connected to the medullary canal of the radius, and the distal end is fixedly connected to the proximal end of the first flexor-extension portion (112).

3. The wrist joint and metacarpophalangeal joint combined prosthesis with flexion-extension function according to claim 2, characterized in that, The metacarpal connecting portion (120) includes: a second flexion-extension portion (121), a first rotation portion (122), and a metacarpal connecting seat (123); The proximal end of the second flexor / extension portion (121) is rotatably connected to the distal end of the first flexor / extension portion (112) via a bolt shaft; the distal end of the second flexor / extension portion (121) is connected to the proximal end of the first rotating portion (122), the distal end of the first rotating portion (122) is coaxially rotatably connected to the proximal end of the metacarpal connector (123), and the distal end of the metacarpal connector (123) is connected to the proximal end of the proximal connector (210); wherein, the first flexor / extension portion (112) and the second flexor / extension portion (121) rotate about a second direction as the axis of rotation, and the first rotating portion (122) and the metacarpal connector (123) rotate about a first direction as the axis of rotation, and the first direction and the second direction intersect each other.

4. The wrist joint and metacarpophalangeal joint combined prosthesis with flexion-extension function according to claim 3, characterized in that, A transition platform is provided on the first rotating part (122), and the far end of the transition platform is in contact with the proximal end of the proximal connecting part (210).

5. The wrist joint and metacarpophalangeal joint combined prosthesis with flexion-extension function according to claim 3, characterized in that, The metacarpal connector (123) is a cylinder, and the proximal end of the proximal connector (210) is provided with a cylindrical groove, and the distal end of the metacarpal connector (123) cooperates with the cylindrical groove.

6. The wrist joint and metacarpophalangeal joint combined prosthesis with flexion-extension function according to claim 5, characterized in that, The distal end of the metacarpal connector (123) is threadedly connected to the cylindrical groove of the proximal connector (210).

7. The wrist joint and metacarpophalangeal joint combined prosthesis with flexion-extension function according to claim 1, characterized in that, The distal end of the third flexure portion (310) and the proximal end of the fourth flexure portion (320) are both disc-shaped. The distal end of the third flexure portion (310) and the proximal end of the fourth flexure portion (320) are coaxially arranged and rotatably connected by a bolt shaft.

8. The wrist joint and metacarpophalangeal joint combined prosthesis with flexion-extension function according to claim 1, characterized in that, The proximal end of the third flexion-extension portion (310) is needle-shaped, and its diameter gradually decreases from the distal end to the proximal end.

9. The wrist joint and metacarpophalangeal joint combined prosthesis with flexion-extension function according to claim 3, characterized in that, The proximal end of the fourth flexor / extensor portion (320) is needle-shaped, and its diameter gradually decreases from the proximal end to the distal end, connecting to the medullary cavity of the proximal phalanx.

10. The wrist joint and metacarpophalangeal joint combined prosthesis with flexion-extension function according to claim 1, characterized in that, The wrist joint prosthesis (100), the metacarpal prosthesis (200), and the hinged finger joint prosthesis (300) all conform to the physiological curvature of the human body.

Images