Microcomputer-Based Muscle Site Identification for Electrode Placement in Myoelectric Prostheses

I. KURTZ, M. MIFSUD, S. HUBBARD,E. HAMILTON, AND S. NAUMANN


Identification of sites for electrode placement in the sockets of myoelectric prostheses traditionally has been done by trial and error measurement of myoelectric signal levels at various sites on the arm. This method is time-consuming and often results in selection of suboptimal sites. A microcomputer-based muscle site identification system alleviates these problems. The system consists of a small (4 cm ((1 5/8 in)) diameter) multielectrode probe, signal processing circuitry, and a microcomputer. When the probe is placed on a contracting muscle, the computer indicates the direction of maximal increase in myoelectric signal. The system also reports to the user the level of cross-talk from the antagonist muscles and suggests an optimal setting for electrode gain

Hugh MacMillan Medical Centre, 350 Rumsey Road, Toronto, Ontario M4G 1R8