Diseño de un mecanismo para controlar el movimiento de flexión - extensión corta para los dedos de una protesis de mano

Abstract

The main objective of this technical project was the designing of a mechanism to move the phalanges of a hand prosthesis, the same ones that simulate the grappling and forceps pressure movement to help people that suffer a type of hand amputation disability, at the same time to be of interest to local manufacturers of mechanic prosthesis that currently work empirically. For the development, several analyses were used starting from the ergonomic study of the human right hand, reaching several entities from metal mechanic sector for taking the anthropometric measures with the objective of stylize the design of the prosthesis. In addition, it was considered the alternative of analyzing the four crossed bars mechanism by using software to interpret their trajectory, speed and acceleration; these issues are important ought to the prosthesis must be sensitive and refined for the patient as interpreted by the standard ISO 13405-3. The activation of the mechanism was achieved by a direct current micromotor, directly connected to a transmission and the mechanism. The prototype was manufactured by using 3D printing technology with local distribution material.