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System for indicating the expiration of the useful operating life of a pulse oximetry sensor

  • US 6,515,273 B2
  • Filed: 02/10/2000
  • Issued: 02/04/2003
  • Est. Priority Date: 08/26/1999
  • Status: Expired due to Term
First Claim
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1. A pulse oximetry sensor which includes an indicator for indicating when the pulse oximetry sensor reaches a point of overuse, the pulse oximetry sensor comprising:

  • a first conductor carrying a drive signal, wherein the drive signal comprises pulses;

    a timer connected to the first conductor, which generates a timer output signal when the pulse oximetry sensor reaches a predetermined point of use;

    an indicator connected to the timer output signal, which provides an indication when the timer output signal is generated;

    an LED network connected to the first conductor, which projects light toward a measurement site when pulsed by the drive signal;

    a second conductor carrying a return signal representative of constituents or characteristics of the measurement site; and

    a detector connected to the second conductor, which detects the projected light and outputs the return signal.

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