Transcutaneous Electrical Nerve Stimulator

Transcutaneous Electrical Nerve Stimulator, more commonly referred to as a TENS unit and pronounced tens, is an electronic device that produces electrical signals used to stimulate nerves through unbroken skin. It is usually applied to the skin using two or more electrodes. A typical battery-operated TENS unit consists of a pulse generator, small transformer, frequency and intensity controls, and a set of electrode wires.

Uses
TENS is considered a method of pain relief, and has a wide following for use in obstetric care particularly labour. Nevertheless, there is little data on its actual efficacy, and many obstetricians maintain that it is ineffective.

In palliative care and pain medicine, TENS is occasionally attempted for neuropathic pain (pain due to nerve damage). Although results are modest, some patients benefit from this approach. To generate more conductivity from the electrode to the skin a cream should be used. The position of the electrodes on your skin can alter which muscle is stimulated.

There is a secondary market for TENS units in the BDSM community, where the units are used for erotic play involving electrical stimulation. (See also: Violet wands).

Safety
TENS Electrodes should never be placed:


 * On or near the eyes
 * In the mouth
 * Transcerebrally (on each temple)
 * On the front of the neck (due to the risk of acute hypotension through a vasovagal reflex)
 * On areas of numb skin
 * On broken skin areas or wounds
 * On or near the Trigeminal nerve if you have a history of Herpes zoster induced Trigeminal neuralgia (Postherpetic neuralgia)

Do not turn TENS up too high as this can cause over-stimulation which may make pain worse. There should be no muscle contraction

TENS should also be used with caution in people suffering from epilepsy or pregnant women. TENS should not be used by people with Cardiac pacemaker due to risk of interference and failure of their implanted device. Possible failure of these warnings can result in Ventricular fibrillation