bionic hand thumb wrist metacarpal joint

Abstract

The invention relates to a carpometacarpal joint of the thumb of a bionic artificial hand. The carpometacarpal joint of the thumb of the bionic artificial hand is provided with a joint gear 6, and the axis position of the gear is made to correspond to the movement axis of a thumb carpometacarpal joint of a human hand. The thumb is driven by a micromotor 2 to rotate around the axis of the joint gear 6, so that the actions of opening and closing of the thumb are completed. A lateral rotating shaft 9 of the carpometacarpal joint of the thumb is fixed to the joint gear 6, and the axis of the lateral rotating shaft 9 and the axis of a thumb opening-closing shaft 7 perpendicularly intersect at the axis of the joint gear 6. The thumb is driven by another micromotor 12 to rotate in the side direction of the axis of the joint gear. The elevation angle of the lateral rotating shaft 9 of the thumb relative to a palm is equivalent to the elevation angle of the thumb relative to the palm when the human hand is relaxed. The functions, actions and appearance of the carpometacarpal joint of the thumb are closer to those of the human thumb, and the carpometacarpal joint of the thumb is simple and reliable in structure and good in practical effect.

Description

technical field [0001] The invention relates to the technical field of prostheses, in particular to the technical field of electric prostheses, in particular to a bionic thumb wrist-metacarpal joint of an upper limb prosthesis. Background technique [0002] The thumb is the most powerful finger in the human hand. Unlike the other four fingers, the bottom joint of the thumb is not the metacarpal joint, but the carpal metacarpal joint. The action is mainly the action of this joint. The current bionic prosthetic thumb cannot fully imitate the function of the human thumb. At present, the wrist and metacarpal joints of the bionic thumb at home and abroad have two degrees of freedom, which are composed of two joints, one is the thumb The open and closed joints, and the other is the thumb lateral rotation joint. These two joints are in different positions, so that the rotation axes of these two joints are in different positions, so regardless of the shape and movement, there is a s...

AI Technical Summary

Problems solved by technology

[0002] The thumb is the most functional finger of the human hand. Different from the other four fingers, the bottom joint of the thumb is not the metacarpal joint, but the carpal metacarpal joint. The main action is the movement of this joint. The current bionic prosthetic thumb cannot completely imitate the function of the human thumb. Now the bionic thumb wrist-metacarpal joint at home and abroad has two degrees of freedom, which is composed of two joints. One is the thumb opening. The opening and closing joints, and the other is the lateral rotation joint of the thumb. These two joints are in different positions, so that the rotation axes of these two joints are in different positions, so there is a significant difference between the shape and movement of the thumb and the thumb of the human hand.

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