Multiplex Electrodes for Applying Transcutaneous Interferential Current

An apparatus for providing electrical stimulation to one or more muscles in a patient, said apparatus comprising:

• means for generating a first time-varying signal and a second time-varying signal;
• means for applying said first time-varying signal and said second time-varying signal to a patient;
• means for summing said first time-varying signal and said second time-varying signal below skin at a particular location of said patient to produce a triple exponential signal, said triple exponential signal comprising:
• a feature pulse for stimulating movement of said one or more muscles and having a frequency below about 1000 Hz;
• and
• a carrier pulse having a frequency greater than about 1000 Hz, wherein said carrier pulse is amplitude modulated.