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Peripheral nerve electrical analgesic stimulators that apply the stimuli through electrodes placed around a peripheral nerve. These stimulators usually consist of either an implanted lead/electrode system attached to a passive electronic circuit into which energy is inductively coupled from outside the body, typically at radio frequencies, or a totally implantable self-contained stimulator that carries its own energy source and has no inherent dependence upon external devices. These implantable analgesic stimulators are used to treat chronic severe intractable pain, where the use of drug therapy is undesirable or no longer effective.
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Peripheral nerve electrical stimulators designed to apply stimuli to alleviate pain (i.e., analgesic). These stimulators typically consist of an electric pulse generator attached to electrodes that deliver the stimuli. Stimulators including an external pulse generator and electrodes that are placed on the skin to apply the stimuli transcutaneously (known as transcutaneous electric nerve stimulators [TENS]) are available. Implantable stimulators, either completely implantable or using a radio-frequency inductive coupling with an external power source, with electrodes located around a peripheral nerve, are also available.
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