An implantable medical device having a case with therapeutic componentry contained with the case. A module has a rail around at least a portion of a perimeter of the module and is adapted to be mechanically secured to the case. The case has a rigid fastening channel adapted to receive the rail of the...http://www.google.co.uk/patents/US7123966?utm_source=gb-gplus-sharePatent US7123966 - Drop and slide engagement for implantable medical device
