Sensory stimulation and sensory anesthesia are induced by means of a device which creates a time varying magnetic field which, in turn, creates an electric field in a direction parallel to the nerve and at the nerve so as to cause either depolarization leading to an action potential and subsequent sensory...http://www.google.com.au/patents/US20020099256?utm_source=gb-gplus-sharePatent US20020099256 - Electromagnetically induced anesthesia and sensory stimulation
