A rechargeable implantable medical device with a magnetic shield placed on the distal side of a secondary recharging coil to improve charging efficiency is disclosed. The rechargeable implantable medical device can be a wide variety of medical devices such as neuro stimulators, drug delivery pumps, pacemakers,...http://www.google.co.uk/patents/US7945334?utm_source=gb-gplus-sharePatent US7945334 - Implantable medical device and electrical stimulation device with magnetic shield
