The present invention provides a multiplex system for identifying the presence of surgical sponges, metal instruments, and other implements in a surgical wound by employing a plurality of discrete sensing systems. At least two modalities of operation are chosen from a plurality of detection modalities,...http://www.google.de/patents/US20060241399?utm_source=gb-gplus-sharePatent US20060241399 - Multiplex system for the detection of surgical implements within the wound cavity
