Reliability of Implantable MyoElectric Sensors (IMES)

We have developed a multi-channel electrogmyography sensor system capable of receiving and processing signals from up to thirty-two Implanted MyoElectric Sensors (IMES). The appeal of implanted sensors for myoelectric control is that EMG signals can be measured at their source providing relatively cross-talk free signals that can be treated as independent control sites. An external telemetry controller receives telemetry sent over a transcutaneous magnetic link by the implanted electrodes. The same link provides power and commands to the implanted electrodes. Wireless telemetry of EMG signals from sensors implanted in the residual musculature eliminates the problems associated with percutaneous wires such as infection, breakage and marsupialization. Implants are designed for permanent long-term implantation with no servicing requirements. We have a fully operational system. The system has been tested in animals. Implants have been chronically implanted in the legs of 3 cats and are still completely operational 12 months after implantation. The recordings are stable and reliable over the chronic recording period.