A device for treating a tissue region is supplied with a separate usage key card. The usage key card comprises a storage medium, which is formatted to contain an identification code unique to the usage key card. The usage key card is adapted to be read by a remote reader, to download the identification...http://www.google.ca/patents/US7922715?utm_source=gb-gplus-sharePatent US7922715 - Graphical user interface for monitoring and controlling use of medical devices
