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Dual sensor oxygen therapy device

  • US 7,222,624 B2
  • Filed: 07/02/2004
  • Issued: 05/29/2007
  • Est. Priority Date: 07/02/2004
  • Status: Active Grant
First Claim
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1. An apparatus with dual sensing means for automatically controlling and conserving the delivery of oxygen to a patient comprising:

  • an oxygen supply generator;

    oximeter means having a first non-invasive sensor to measure blood hemoglobin saturation (SpO2) of a patient and a second non-invasive sensor to measure the pulse rate of the patient;

    means for providing a setpoint level of a desired blood saturation for the patient;

    first control means adapted for identifying a pulse rate and providing a pulse signal;

    second control means adapted for identifying a first error signal representing the difference between the setpoint level and a signal representing the measurement of the blood saturation;

    means for responding to the pulse signal and the first error signal to provide an oxygen flow setpoint signal;

    means for identifying a flow from the oxygen supply generator to provide an oxygen flow signal;

    means adapted for identifying a second error signal representing the difference between the oxygen flow signal and the oxygen flow setpoint signal; and

    means for responding to the second error signal to modulate variables of the oxygen generator to a desired level.

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