The electronics for a wearable surface stimulation device (SSD) used for the treatment of chronic wounds is presented. The device consists of a flexible polyimide substrate with platinum electrodes and a small, battery-powered circuit board that provides up to seven days of user-programmable stimulation.
A boost converter circuit generates stimulation pulses up to 20 mA. Special control algorithms implemented in a microcontroller are used to minimize power consumption and extend battery life. High-voltage interface circuits and a tissue impedance measurement function are used to control the stimulation pulse timing and current.
Custom software has been written to communicate with the SSD through an infrared link. This communication interface allows the user to program stimulation parameters, read out experiment measurements, and utilize on-board diagnostic tools.
The electrical performance has been measured and compared to calculations and simulation results. The results of a preliminary animal experiment are also reported.