A SIC design of an implantable system for improved control of hand prosthesis

A flexible implantable solution with integrated electromyogram (EMG) and neurostimulation functions for improved control of prosthetic hands is presented. The main board of the implant is composed of two custom designed ICs, a microcontroller, an inductive power supply and a wireless communication interface. The EMG Monitor-ASIC can handle eight differential channels and provides a selectable midband gain ranging from 50-5000V/V in a bandwidth from 2Hz-1.1kHz. The input referred noise was measured to be 1.7mVrms. An adjustable 50/60Hz notch filter for suppression of power line interferences and a CMRR of more than 80dB increase the robustness of this IC. The stimulator-ASIC can be configured to deliver bipolar or monopolar current pulses through four differential electrodes with maximum amplitudes of 500mA and 1mA resolution. The stimulation profile can be configured with independent durations of each phase and a wide range of repetition rates. The eight layer PCB measures 26.0mm × 20.9mm and the ASICs are directly wire bonded to it.