Proximal interphalangeal joint structure of prosthetic finger

Abstract

The invention provides a proximal interphalangeal joint structure of a prosthetic finger. The proximal interphalangeal joint structure comprises a proximal interphalangeal joint machine frame (4), a rotating shaft and a worm wheel (2), wherein a motor speed reducer assembly (401), a first bevel gear (402) and a second bevel gear (403) are arranged in the proximal interphalangeal joint machine frame (4); a worm (404) is arranged in the proximal interphalangeal joint machine frame (4) through a circlip for hole (407) and two sliding bearings; the proximal interphalangeal joint machine frame (4) is provided with an opening groove (44); the worm wheel (2) is positioned in the opening groove (44); and the rotating shaft is arranged on the proximal interphalangeal joint machine frame (4) and the worm wheel (2) in a penetrating way. The worm wheel is installed through the opening groove; the rotating shaft is simultaneously arranged on the proximal interphalangeal joint machine frame (4) and the worm wheel in a penetrating way; the opening groove can restrict the worm wheel so that the worm wheel can stably rotate; the worm is arranged through the circlip for hole and the two sliding bearings, so that the worm can flexibly rotate and is reliably positioned; and the work reliability of the proximal interphalangeal joint structure can be improved.

Description

technical field [0001] The invention relates to a bionic hand, in particular to a prosthetic hand for disabled people, its fingers and part of the structure. Background technique [0002] Human hands generally have five fingers, followed by thumb, index finger, middle finger, ring finger and little finger. Except that the thumb has a special movement law, the movement laws of the other four fingers are basically the same. Each finger is divided into three knuckles, which are the base knuckle, the proximal knuckle and the distal knuckle in turn. They are connected by joints in corresponding positions, and the nails grow on the far knuckles. For some disabled people, it is necessary to utilize the prosthetic hand to realize the basic functions of the human hand. [0003] Before 2007, the most sold prosthetic hand on the market was the single-free prosthetic hand produced by OTTOBOCK in Germany. This type of prosthetic hand only has basic opening and closing functions. Moveme...

AI Technical Summary

Problems solved by technology

[0007] 1. The base knuckles of the prosthetic fingers have many components, and the assembly relationship is complicated. It is difficult to effectively and accurately locate the components, and the assembly is difficult. In particular, the base knuckle structures of some existing prosthetic fingers have simple assembly structures As a result, the working reliability of the base knuckle is poor, and it is prone to failure

[0008] 2. In some existing prosthetic fingers, the connection structure between the base phalanx and the base joint of the prosthesis finger is complicated, and the base phalanx of the finger is difficult to assemble on the base joint structure, and cannot be assembled simply and effectively

[0009] 3. For some existing prosthetic fingers that use cable transmission for proximal knuckles, the proximal end of the transmission rope is connected to the worm gear, but the specific connection structure adopted is not convenient for assembly, and the proximal end of the transmission rope is also prone to fall off. Not conducive to reliable use of prosthetic hands

[0010] 4. For some existing prosthetic fingers, the proximal knuckles are driven by cables. Frequent finger flexion and finger extension operations will easily cause the transmission rope to be rubbed and scratched on the base knuckles of the finger. Long-term use will easily cause the transmission rope to wear or even break , affecting the service life of the cable transmission mechanism

[0011] 5. In some existing prosthetic fingers, the proximal knuckle of the finger and the base knuckle of the finger are connected by a stretch spring to realize the automatic reset of the proximal knuckle of the finger when the finger is extended, and the end of the stretch spring is fixed. The connection method, so the tension spring is frequently subjected to the compound action of tension and bending moment, and long-term use will cause the tension spring to undergo bending residual deformation

This will cause the fingers of the prosthesis to flex and spread out of position, reducing the performance of the prosthetic fingers and prosthetic hands

[0012] 6. Some existing prosthetic fingers do not distinguish between the far knuckle and the near knuckle of the finger in structure, which is not convenient for the assembly of the near knuckle of the finger and other parts, or the near knuckle of the finger and the far knuckle of the finger The connection method of using en

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