Prosthetic thumb mechanism

Abstract

The invention discloses a prosthetic thumb mechanism, and relates to the field of prosthesis. The mechanism comprises a first carpometacarpal joint mechanism, a second carpometacarpal joint mechanismand a thumb device. The second carpometacarpal joint mechanism and the first carpometacarpal joint mechanism are fixedly connected, the thumb device is connected with the second carpometacarpal jointmechanism, the first carpometacarpal mechanism achieves adduction and abduction, the second carpometacarpal joint mechanism achieves flexion and extension, and the thumb device achieves underactuationof first and second joints. The prosthetic thumb mechanism can be interchanged between the left hand and the right hand. The second carpometacarpal joint mechanism and the thumb device simultaneouslyachieve coupling movement by a worm wheel and linear transmission. The prosthetic thumb mechanism has the functions of simple structure, multiple degrees of freedom and light weight, so that the prosthetic thumb can achieve the multi-directional multi-modal grasping function.

Description

technical field [0001] The invention relates to the field of artificial limbs, in particular to an artificial limb thumb mechanism. Background technique [0002] The movement form of the thumb has the most freedom of movement among all fingers, and it has a great influence on the grasping and multimodality of artificial prosthetic hands. However, most of the prosthetic thumb mechanisms can only achieve grasping movement in a single direction. and the thumb open and close relative to the other four fingers. [0003] And several thumb mechanisms that have appeared recently are all purely rigid mechanisms, which are relatively complex in structure and heavy in weight, which have great limitations on the daily use and comfort of patients. This single action has been difficult to meet the daily needs of patients. [0004] Therefore, those skilled in the art are devoting themselves to developing a prosthetic thumb mechanism to realize multi-degree-of-freedom and multi-modal pros...

AI Technical Summary

Problems solved by technology

[0002] The movement form of the thumb has the most freedom of movement among all fingers, and it has a great influence on the grasping and multimodality of artificial prosthetic hands. However, most of the prosthetic thumb mechanisms can only achieve grasping movement in a single direction. and the thumb open and close relative to the other four fingers

[0003] Moreover, several thumb mechanisms that have appeared recently are all purely rigid mechanisms, which are relatively complex in structure and heavy in weight, which have great limitations on the daily use and comfort of patients.

This single action has been difficult to meet the daily needs of patients

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