NeuroMuscular Electrical Stimulator

I participated in Student Design Compitition, this is what I came up with in 3 days.

Neuromuscular Electrical Stimulation (NMES) is a non-invasive, non-addictive means of muscle rehabilitation after injury, surgery or disease. Patients with a wide range of orthopedic and neurologic diagnoses can benefit from NMES, which applies customized electrical stimulus to cause a muscle to contract. “The major benefit of integrating NMES in the treatment of patients is the reduction of total rehabilitation time and concomitant reduction in the total cost of recovery.” (Electrotherapy in Rehabilitation, Meryl Roth Gersh, 1992).

The device will have two output channels that can operate in three different modes of operation (stimulation): Synchronous, Constant or Alternate.  The main focus of the design is on the power circuit,  control circuit and the amplifier circuits for outputting the appropriate signals at the appropriate and predefined  (by the user ) waveforms and intensities.  The purpose of this design is the challenge to build a lower cost NMES machine comparable to what is on the medical market (©EMPI $1500.00).  The hardest part of the design is to create an output signal that is linear and not stepped for precision and comfort to a patient.   The basics treatment of this device is that it should be a handheld device and easily useable from a medical practitioner like Doctor of Physical Therapy or a home user with just a brief usage training.