a dual channel neuromuscular stimulator . pulses developed by a pulse generator are transmitted alternately on both channels to involuntarily contract muscles . the stimulator has variable on / off cycling capability to provide flexibility in meeting the stimulation needs of patients and has output current adjustments and other variable parameter settings to achieve optimum neuromuscular stimulation . to enhance patient comfort , the stimulation output of the stimulator can be slowly &# 34 ; ramped up &# 34 ; to its full stimulation power to allow the increase in stimulation to occur at various rates to accommodate the differing characteristics of different muscle groups . a jack is provided to permit the stimulation to be controlled by an external switch operated by a clinician to coordinate stimulation of various muscle groups with voluntary muscle contraction by the patient . the jack can also be connected to a heel operated switch to stimulate muscle groups to allow certain disabled persons to walk normally . the balanced biphasic output waveform of the stimulator has a zero net dc component to minimize the possibility of skin rash developing from stimulation .