Implementation of a prototype prosthesis with muscular control to improve the movement and grip of objects, applied to people with stump or malformation in the fingers of the hand.

Abstract

A prototype hand prosthesis with muscle control and wireless communication was implemented. It is a modular system, low cost, adaptable, easy to install and operate, which allows wireless control from a muscle signal coming from the arm. With the tests carried out, it was verified that the implemented system is capable of identifying muscle movements with a margin of error of 5%. The tests performed in the connection of the devices were successful by 95%. And the individual tests of grips with light objects have 90% success, these movements show the use of the prototype in light work routines. The muscle gestures are linked to finger movements of the prosthesis, these are executed from a controller that is able to identify the myoelectric signals with a sampling response of 2ms and an execution latency of less than 1 second. It consists of four modules, the sensing module formed by myoelectric sensors that collect the information of the muscular movements of the arm and transmit it wirelessly to the control module. The second, a control module consisting of a microcontroller mounted on an Arduino card that is responsible for receiving the signals from the sensors, identify the gestures and send control and warning signals to the remaining modules. The third, a module of action that is conformed by servomotors that are in charge of the movement of the fingers to execute the holds and receive their information with serial transmission from the Arduino. The fourth, a module notifies each of the movements made. The modules are mounted on a structure printed in 3D, so that it is adaptable, light and comfortable for the user.