A Transcutaneous Electrical Nerve Stimulator, referred to as TENS, is an electronic device that produces electrical signals used to relieve pain by sending gentle electrical impulses through the skin to the nerves. These impulses reduce or suppress pain by blocking the pain signals before they reach the brain. TENS are usually applied to the skin using two or more electrodes that are strategically placed at appropriate pain sights on the body. A typical battery-opperated TENS unit consists of a pulse generator, small transformer, frequency and intensity controls, and a set of electrode wires.
TENS is a drug-free way for managing pain and is characterized by biphasic, low volt, current with selectable parameters such as pulse rate and/or pulse width. TENS stimulate sensory nerves to block pain signals and stimulates endorphin production to help normalize sympathetic function.