Disclosed are apparatus and method for detecting electromagnetic interference (EMI), or noise, that may disrupt the proper operation of medical devices implantable in patients, such as cardiac stimulators. Circuitry of the detector of the invention is independent of other circuitry of...http://www.google.co.uk/patents/US5697958?utm_source=gb-gplus-sharePatent US5697958 - Electromagnetic noise detector for implantable medical devices
