Design of a Bionic Hand Using Non Invasive Interface

Abstract

<p>The use of a bionic hand using a non invasive interface is a project aimed at restoring motor function and limited sensory information to a patient who has lost a hand or an arm. The use of an easy to use interface that gives the user control with their functioning hand simplifies daily activities that would otherwise be more difficult. Signal extraction can be acquired from the control unit using magnetic Hall Effect sensors which then act as a 2-bit binary positional system for the output of the bionic hand. Electronic circuitry must be developed to safely transmit control signals to hardware and also send appropriate output pulses to drive the mechanical system. In addition a microcontroller must be programmed for the logical control of the output with respect to the control signals and feedback from pressure sensors on the bionic hand. Important theoretical developments are discussed with a design strategy on implementing the solution. Input regulation is developed to isolate the control signals from the microcontroller to protect the user and the equipment of any possible damage. Logical programming is done on the microcontroller via C to receive inputs and act as a 2-to-4 decoder for output paths, with appropriate output pulses to the motors. In addition the programming is able to receive feedback from the hand in the form or pressure sensors that alert the user when objects are grasped and firmly held. This report concludes with a critical analysis of the results obtained and future recommendations on delivering a more accurate project.</p>