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Sensor with signature of data relating to sensor

  • US 6,708,049 B1
  • Filed: 09/14/2000
  • Issued: 03/16/2004
  • Est. Priority Date: 09/28/1999
  • Status: Expired due to Term
First Claim
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1. A pulse oximeter apparatus comprising:

  • a pulse oximeter sensor having an output for providing a signal corresponding to a measured physiological characteristic;

    a memory associated with the sensor and located external to a monitor which receives the sensor signal, said memory containing data relating to said sensor and containing a digital signature, wherein at least a first portion of said data is contained within said digital signature, wherein a second portion of said data is outside said digital signature and is masked using a symmetric key contained within the digital signature.

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