Evaluation of solutions to improve upper limb prosthesis control
Research type
Research Study
Full title
Evaluation of mechanical and software solutions to improve the control of upper limb myoelectric prostheses
IRAS ID
335194
Contact name
Laurence Kenney
Contact email
Sponsor organisation
University of Salford
Duration of Study in the UK
0 years, 5 months, 0 days
Research summary
Myoelectric prostheses are designed to restore appearance and some function for people with upper limb absence. They are controlled by EMG (myoelectric) signals generated by contraction of the residuum’s musculature, acquired by socket-located electrodes. Despite considerable research and development, there remain high levels of rejection. Even amongst those who have not rejected their prosthesis, heavy reliance on the intact limb is common. The reported reasons for rejection and/or limited prosthesis use include weight, comfort and, of most relevance to this study, poor prosthesis control and limited functionality.
A key problem faced by users is the unreliability of the EMG signal from socket-located electrodes. Standard designs allow the electrode to move with the socket, resulting in ‘motion artefacts’ in the signals. These can cause false prosthesis activations, or worse still, cause the electrode to lose contact with the skin, making control impossible. Our earlier work suggested such problems are commonly experienced by users of myoelectric prostheses.
In our NIHR-funded project we have developed two new systems to improve the reliability with which a user can control their myoelectric prosthesis. Our electrode housing reduces the tendency for the electrode to move with the (inevitable) movements of the socket on the limb; and our electronic (artefact rejection) system monitors the measured signals and blocks artefacts. In this study we will invite 25 participants who have a limb absence at the trans-radial (forearm) level and who have experienced problems with their myoelectric prosthesis, to carry out a series of simple pick and place tasks. We will compare their performance using their standard arrangement and when using our new systems. The study will involve 2 visits, 2-3 weeks apart, and either or both visits can take place at the participant’s home, or in one of our labs at the University of Newcastle, or University of Salford.REC name
London - Queen Square Research Ethics Committee
REC reference
24/LO/0150
Date of REC Opinion
20 Mar 2024
REC opinion
Further Information Favourable Opinion