Patent ID: 8030891

Claim:
An ambulatory medical device connectable to a peripheral device via an active communication cable, the ambulatory medical device comprising: a housing sized and configured to be ambulatory for a patient and presenting a communication connector configured to interface with the active communication cable; a fluid conduit configured to extend between the housing and the patient; a battery carried by the housing that provides electrical power for the device and has a battery ground; first circuitry housed within the housing and electrically connected to the battery ground, the first circuitry including: a first isolator transceiver adapted to communicate at least one control signal; a first giant magneto-resistive (GMR) isolator transceiver adapted to communicate at least one electrical data signal; and control circuitry for the device having a communication port connected to the first isolator transceiver and the first GMR isolator transceiver to communicate the at least one control signal and the at least one data signal to and from the control circuitry; and second circuitry housed within the housing and electrically connected to a cable ground signal on the active communication cable via the communication connector, the second circuitry including: a second isolator transceiver coupled to the first isolator transceiver and adapted to communicate the at least one control signal; a second GMR isolator transceiver magnetically coupled to the first GMR isolator transceiver and adapted to communicate the at least one data signal; and communication circuitry electrically coupled to the communication connector and to the second isolator transceiver and the second GMR isolator transceiver to communicate the at least one data signal to and from the active communication cable, such that the first circuitry and the patient are isolated from the second circuitry and the peripheral device.