Abstract: A medical electrical apparatus impresses a bipolar, low frequency voltage wave form through spaced-apart electrodes, across a damaged area of living animal tissue to cause a low, bipolar, current to flow through the damaged area to increase the metabolic activity of viable cells in that area and hence to accelerate healing. The current flow is monitored and used to control the magnitude of the voltage wave to cause the magnitude of current flow to be within the desired parameters. The frequency, wave form and voltage of the impressed voltage wave and the current flow are all below a level which can damage typical living cells.