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Techniques for detecting heart pulses and reducing power consumption in sensors

  • US 7,499,740 B2
  • Filed: 01/08/2007
  • Issued: 03/03/2009
  • Est. Priority Date: 02/25/2004
  • Status: Active Grant
First Claim
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1. A pulse oximeter system comprising:

  • a drive interface that controls drive current of light emitting elements in a pulse oximeter sensor; and

    a feedback loop coupled around the pulse oximeter sensor and the drive interface that is capable of dynamically adjusting the drive current of the light emitting elements based at least in part upon results of a comparison between a signal-to-noise ratio of a pulse oximeter signal and a threshold, wherein the feedback loop is capable of detecting systolic transitions based at least in part upon a multi-step averaging scheme,wherein the pulse oximeter signal is generated by a photodetector in the pulse oximeter sensor.

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