Dual sensor oxygen therapy device
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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Abstract
Methods and apparatus for supplying respiratory oxygen to a patient where the oxygen flow is monitored so as to be control and conserve in response to the patient'"'"'s pulse rate and blood hemoglobin saturation.
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Citations
8 Claims
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1. An apparatus with dual sensing means for automatically controlling and conserving the delivery of oxygen to a patient comprising:
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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. - View Dependent Claims (2, 3, 4)
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5. A method for delivering and controlling oxygen to a patient from an oxygen supply while effectively conserving said oxygen supply, comprising the steps of:
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a) providing a supply of oxygen from an oxygen generator; b) providing a desired setpoint signal for the blood hemoglobin saturation of a patient; c) measuring the blood hemoglobin saturation (SpO2) in the patient and providing said measured value as an SpO2 signal; d) generating a first error signal by subtracting the setpoint signal from the measured blood hemoglobin saturation signal; e) measuring the pulse rate on the patient and providing said measure as a pulse signal; f) generating an oxygen flow setpoint signal by combining the first error signal and the pulse signal; g) measuring the oxygen flow from the oxygen generator and providing an oxygen flow signal; h) generating a second error signal by subtracting the oxygen flow setpoint signal from the oxygen flow signal; and i) adjusting a deliverable amount of oxygen to the patient in response to the second error signal of step. - View Dependent Claims (6, 7, 8)
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Specification