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Interface cable

  • US 7,509,494 B2
  • Filed: 02/28/2003
  • Issued: 03/24/2009
  • Est. Priority Date: 03/01/2002
  • Status: Active Grant
First Claim
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1. An interface method of interconnecting a patient monitoring instrument and a noninvasive sensor usable with said patient monitor to supply said patient monitor signals processable to determine one or more physiological parameters of a monitored patient, the interface method comprising the steps of:

  • detecting if said sensor is valid by determining sensor identification information using at least a light emitter drive signal line disposed within a cable and an identification reader disposed within said cable;

    performing an encryption handshake with said patient monitoring instrument upon valid sensor detection, said performing the encryption handshake comprising dynamically generating a private encryption key based at least partly on a public seed;

    enabling normal physiological measurements processing with said patient monitoring instrument after successful completion of said encryption handshake; and

    providing light emitter drive signals to the sensor using the light emitter drive signal line.

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