CN216535677U

CN216535677U - Customized finger joint prosthesis

Info

Publication number: CN216535677U
Application number: CN202121413494.8U
Authority: CN
Inventors: 刘志岩; 刘曙光; 许奎雪; 张朝锋; 史春宝; 周浩然; 刘雅卿
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2022-05-17
Anticipated expiration: 2031-06-24

Abstract

The utility model relates to the technical field of medical prostheses, and provides a customized finger joint prosthesis. The method comprises the following steps: the phalanx proximal prosthesis, the ball head and the phalanx distal prosthesis are sequentially connected; wherein the phalanx proximal prosthesis is provided with a phalanx distal prosthesis handle; the proximal phalanx prosthesis is formed by 3D printing according to the phalanx size design of a patient, and the structural sizes of the ball head and the distal phalanx prosthesis are determined according to the printing structural size of the proximal phalanx prosthesis; screwing a ball head into the proximal phalanx prosthesis, and inserting the proximal phalanx prosthesis handle into a bone cavity at the proximal phalanx; then inserting the distal phalanx prosthesis handle into a bone cavity at the distal phalanx, and finishing the fixation of the distal phalanx prosthesis handle in the bone cavity by matching with bone cement; and finally, inserting the ball head into the phalanx distal prosthesis. The utility model has the beneficial effects that: the ball head is plugged into the ball socket of the distal phalanx prosthesis, and the ball head extends into the ball socket of the distal phalanx prosthesis to form semi-surrounding type matching, so that joint dislocation can be effectively prevented.

Description

Customized finger joint prosthesis

Technical Field

The utility model relates to the technical field of medical prostheses, in particular to a customized finger joint prosthesis.

Background

Chinese patent CN 105496612B discloses a finger joint prosthesis, comprising: the knuckle comprises a ball socket head and a knuckle handle part which are connected, and two sides of one end of the knuckle handle part, which is close to the ball socket head, are provided with raised first longitudinal ribs; the metacarpophalangeal joint comprises a ball head and a metacarpophalangeal joint handle part which are connected, wherein two sides of one end, close to the ball head, of the metacarpophalangeal joint handle part are provided with second longitudinal ribs which are raised, and the second longitudinal ribs and the first longitudinal ribs can be embedded into a patient body to prevent the metacarpophalangeal joint and the finger joint from rotating in the patient body. The finger joint prosthesis provided by the utility model enhances the surface roughness, is beneficial to bone growth so as to prolong the service life of the prosthesis, is stable to implant and convenient to operate, has the handle shape beneficial to blood supply of finger joints, and is provided with the longitudinal ribs which are beneficial to rotation resistance so as to facilitate implantation.

However, the finger joint prosthesis in the prior patent has the following defects: (1) the ball socket head and the finger joint handle part which are mutually matched are easy to cause joint dislocation in use; (2) the later repair of the finger joint prosthesis is difficult; (3) the stem of the finger joint prosthesis is too smooth to facilitate the fixation of the bone cavity.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a customized finger joint prosthesis to solve the technical problems in the prior art.

In order to realize the purpose, the utility model adopts the technical scheme that: a customized finger joint prosthesis comprising: the phalanx proximal prosthesis, the ball head and the phalanx distal prosthesis are sequentially connected; wherein the distal phalangeal prosthesis is provided with a distal phalangeal prosthesis stem; the proximal phalanx prosthesis is formed by 3D printing according to the size design of the phalanx of a patient, and the structural sizes of the ball head and the distal phalanx prosthesis are determined according to the printing structural size of the proximal phalanx prosthesis; the thread of the ball head is screwed into a phalanx proximal prosthesis threaded hole of the phalanx proximal prosthesis, and a phalanx proximal prosthesis handle is inserted into a bone cavity at the proximal end of the phalanx; inserting the distal phalanx prosthesis handle into a bone cavity at the distal phalanx, and finishing the fixation of the distal phalanx prosthesis handle in the bone cavity by matching with bone cement; the ball head is plugged into a phalanx far-end prosthesis ball socket of the phalanx far-end prosthesis.

In an optional embodiment, a strip-shaped through hole is formed in the side wall of the ball socket of the distal phalangeal prosthesis, and a limiting gap is formed in the strip-shaped through hole.

In an alternative embodiment, the ball head extends into the ball socket of the phalangeal distal prosthesis to form a semi-enclosed fit.

In an alternative embodiment, the outer surface of the distal phalangeal prosthesis is uniformly provided with a plurality of grooves.

In an optional embodiment, the distal phalangeal prosthesis is machined from ultra-high molecular weight polyethylene; the ball head is processed by cobalt-chromium-molybdenum alloy; the phalanx proximal prosthesis handle is formed by 3D printing of titanium alloy.

In an alternative embodiment, the surface of the phalangeal proximal prosthesis handle is in the shape of irregular hollowed-out holes.

The utility model has the beneficial effects that:

(1) the ball head in the customized finger joint prosthesis is plugged into the ball socket of the distal phalangeal prosthesis, the ball head extends into the ball socket of the distal phalangeal prosthesis to form semi-enclosed fit (the ball socket covers half of the whole volume of the ball head during the fit), and joint dislocation can be effectively prevented in use.

(2) The ball head of the customized finger joint prosthesis is in threaded connection and matching with the proximal end prosthesis of the phalanx, so that early installation and later renovation are facilitated. In addition, the distal phalanx prosthesis is provided with a limiting notch, which accords with the optimal moving angle of the human body.

(3) The outer surface of the distal phalangeal prosthesis of the customized finger joint prosthesis is uniformly provided with a plurality of grooves, which is beneficial to fusing bone adhesives and enables the distal phalangeal prosthesis to be firmer in the phalangeal cavity.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic overall structure diagram of a customized finger joint prosthesis according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a distal phalanx prosthesis in a customized finger joint prosthesis according to an embodiment of the utility model.

Fig. 3 is a sectional view of a distal phalangeal prosthesis in a customized finger joint prosthesis according to an embodiment of the present invention.

Fig. 4 is a sectional view of a proximal phalanx prosthesis in a customized finger joint prosthesis provided according to an embodiment of the utility model.

Fig. 5 is a schematic structural diagram of a ball head in the customized knuckle prosthesis according to an embodiment of the present invention.

Wherein, the reference numbers in the figures are: 1. the phalanx proximal prosthesis comprises a phalanx proximal prosthesis body 11, a phalanx proximal prosthesis body handle 12, a phalanx proximal prosthesis body threaded hole 2, a ball head 3, a phalanx distal prosthesis body 31, a phalanx distal prosthesis body handle 32, a phalanx distal prosthesis body ball socket 33, a limiting notch 34 and a groove.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless specifically limited otherwise.

Referring to fig. 1-5, the present embodiment provides a customized finger joint prosthesis, comprising: the phalanx proximal prosthesis 1, the ball head 2 and the phalanx distal prosthesis 3 are connected in sequence.

Further, the distal phalangeal prosthesis 3 is provided with a distal phalangeal prosthesis handle 31, the distal phalangeal prosthesis 3 is provided with a distal phalangeal prosthesis socket 32, and the ball head 2 is inserted into the distal phalangeal prosthesis socket 32. It should be noted that the ball head 2 extends into the distal phalangeal prosthetic socket 32 to form a semi-enclosed fit, and the socket 32 covers half of the overall volume of the ball head 2 during fitting, so that dislocation can be effectively prevented during use.

Specifically, a strip-shaped through hole is formed in the side wall of the distal phalangeal prosthesis ball socket 32, and a limiting notch 33 is formed in the strip-shaped through hole and conforms to the optimal movement angle of the human body. In addition, the outer surface of the distal phalangeal prosthesis 3 is uniformly provided with a plurality of grooves 34, which is beneficial for fusing bone cement, so that the distal phalangeal prosthesis 3 is firmer in the phalangeal cavity.

It is worth mentioning that the phalanx proximal prosthesis 1 is provided with a phalanx proximal prosthesis handle 11, the top of the phalanx proximal prosthesis is provided with a phalanx proximal prosthesis threaded hole 12, the lower part of the ball head 2 is provided with threads, and the ball head 2 is screwed into the phalanx proximal prosthesis threaded hole 12 through the threads, so that early installation and later repair are facilitated.

The phalanx distal prosthesis 3 is made of ultra-high molecular weight polyethylene, and has the advantages of high wear resistance, impact resistance, corrosion resistance, self-lubrication, nontoxicity, strong anti-sliding friction capacity, high impact toughness value and strong impact resistance, relative motion between joints can be better recovered, and the safety of patients can be effectively protected. The ball head 2 is processed by cobalt-chromium-molybdenum alloy; the proximal phalanx prosthesis handle 11 is formed by 3D printing of titanium alloy, and the surface of the proximal phalanx prosthesis handle 11 is in an irregular hollowed hole shape, so that the friction force in a phalanx cavity can be increased, and the growth of bone tissues is facilitated.

The working process of the customized finger joint prosthesis comprises the following steps: the proximal phalanx prosthesis 1 is formed by 3D printing according to the phalanx size design of a patient, and the structural sizes of the ball head 2 and the distal phalanx prosthesis 3 are determined according to the printing structural size of the proximal phalanx prosthesis 1; screwing the thread of the ball head 2 into the proximal phalanx prosthesis threaded hole 12 of the proximal phalanx prosthesis 1, and inserting the proximal phalanx prosthesis handle 11 into a bone cavity at the proximal phalanx; then the distal phalanx prosthesis handle 31 is inserted into the bone cavity at the distal phalanx, and the fixation of the distal phalanx prosthesis handle in the bone cavity is completed by matching with bone cement; finally, the ball head 2 is plugged into the phalangeal distal prosthesis ball socket 32 of the phalangeal distal prosthesis 3 to form a semi-surrounding type fit, so that joint dislocation can be effectively prevented.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A customized finger joint prosthesis comprising: the phalanx proximal prosthesis (1), the ball head (2) and the phalanx distal prosthesis (3) are connected in sequence; wherein the phalanx distal prosthesis (3) is provided with a phalanx distal prosthesis handle (31);

the method is characterized in that: the phalangeal near-end prosthesis (1) is formed by 3D printing according to phalangeal size design of a patient, and the structural sizes of the ball head (2) and the phalangeal far-end prosthesis (3) are determined according to the printing structural size of the phalangeal near-end prosthesis (1); the thread of the ball head (2) is screwed into a proximal phalanx prosthesis threaded hole (12) of the proximal phalanx prosthesis (1), and a proximal phalanx prosthesis handle (11) is inserted into a bone cavity at the proximal phalanx; the distal phalanx prosthesis handle (31) is inserted into a bone cavity at the distal phalanx, and is matched with bone cement to finish the fixation in the bone cavity; the ball head (2) is plugged into a phalanx far-end prosthesis ball socket (32) of the phalanx far-end prosthesis (3).

2. The customized finger joint prosthesis according to claim 1, wherein a strip-shaped through hole is formed on the side wall of the ball socket (32) of the distal phalangeal prosthesis, and the strip-shaped through hole forms a limiting notch (33).

3. The customized finger joint prosthesis according to claim 2, characterized in that the ball head (2) extends into the distal phalangeal prosthesis socket (32) forming a semi-enclosed fit.

4. The customized finger joint prosthesis according to claim 1, characterized in that the outer surface of the distal phalangeal prosthesis (3) is uniformly provided with a plurality of grooves (34).

5. The customized finger joint prosthesis according to claim 1, wherein the distal phalangeal prosthesis (3) is machined from ultra-high molecular weight polyethylene; the ball head (2) is processed by cobalt-chromium-molybdenum alloy; the phalanx proximal prosthesis handle (11) is formed by 3D printing of titanium alloy.

6. The customized finger joint prosthesis according to claim 1, wherein the surface of the proximal phalangeal prosthesis stem (11) is in the shape of irregular hollowed-out holes.