Oximeter sensor temperature control
First Claim
1. A blood oxygen saturation monitoring system for non-invasive measurement of oxygen saturation of arterial blood in tissue of a patient, comprising:
- a first source of electromagnetic radiation at a first wavelength;
a second source of electromagnetic radiation at a second wavelength;
means for positioning said first and second sources of electromagnetic radiation on the patient so as to illuminate a sample of blood in the tissue;
detecting means for receiving electromagnetic radiation reflected by said sample of blood;
data processing means for calculating the blood oxygen saturation of said tissue responsive to said detected reflected electromagnetic radiation; and
means for maintaining said tissue at a predetermined temperature responsive to the temperature of said tissue.
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Accused Products
Abstract
A system for measuring blood oxygen saturation uses a noninvasive optical technique. A patient'"'"'s arterial blood is illuminated with light at two different wavelengths and the intensity of the reflected light is correlated with an oxygen saturation reference curve to determine the oxygen saturation of the patient'"'"'s blood. The optical sensor includes one or more controlled heat sources which are used to maintain the patient'"'"'s tissue at a predetermined temperature. Safety circuits are also provided in order to prevent thermal burns to a patient in the event of a system failure.
310 Citations
19 Claims
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1. A blood oxygen saturation monitoring system for non-invasive measurement of oxygen saturation of arterial blood in tissue of a patient, comprising:
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a first source of electromagnetic radiation at a first wavelength; a second source of electromagnetic radiation at a second wavelength; means for positioning said first and second sources of electromagnetic radiation on the patient so as to illuminate a sample of blood in the tissue; detecting means for receiving electromagnetic radiation reflected by said sample of blood; data processing means for calculating the blood oxygen saturation of said tissue responsive to said detected reflected electromagnetic radiation; and means for maintaining said tissue at a predetermined temperature responsive to the temperature of said tissue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A blood oxygen saturation monitoring system for noninvasive measuring of arterial blood oxygen saturation in tissue of a patient comprising:
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a first source of electromagnetic radiation at a first wavelength; a second source of electromagnetic radiation at a second wavelength; means for positioning said first and second sources of electromagnetic radiation on the patient so as to illuminate a sample of blood in tissue; detecting means for receiving electromagnetic radiation reflected by said sample of blood; data processing means for computing the blood oxygen saturation of said tissue responsive to said detected reflected electromagnetic radiation; a light emitting diode producing electromagnetic radiation for heating said tissue; means for controlling said light emitting diode thereby maintaining said tissue at a predetermined temperature; and safety means for disabling said light emitting diode thereby preventing thermal burns to said tissue in the event of a system failure. - View Dependent Claims (14)
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15. A method for determining the oxygen saturation of arterial blood in tissue, comprising the steps of:
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illuminating a sample of said blood with electromagnetic radiation at a first wavelength; illuminating said sample of blood with electromagnetic radiation at a second wavelength; controlling the temperature of said tissue to maintain said tissue at a predetermined temperature; collecting electromagnetic radiation reflected by said sample of blood in the tissue at the predetermined temperature and forming data signals therefrom; and processing said data signals to calculate the blood oxygen saturation of the blood in said tissue. - View Dependent Claims (16)
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17. A blood oxygen saturation monitoring system for non-invasive measurement of oxygen saturation of arterial blood in tissue of a patient, comprising:
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a first source of electromagnetic radiation at a first wavelength; a second source of electromagnetic radiation at a second wavelength; means for positioning said first and second sources of electromagnetic radiation on the patient so as to illuminate a sample of blood in the tissue; detecting means for receiving electromagnetic radiation reflected by said sample of blood; data processing means for calculating the blood oxygen saturation of said tissue responsive to said detected reflected electromagnetic radiation; and means for maintaining said tissue at a predetermined temperature comprising; a light emitting diode; a thermal sensor having an output signal indicative of the temperature of said tissue; a control circuit responsive to said output signal of said thermal sensor and having a feedback circuit with an adjustable setpoint; and a core temperature probe coupled to said control circuit for monitoring the patient'"'"'s body temperature and for providing a reference signal for comparison with said setpoint.
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18. A blood oxygen saturation monitoring system for noninvasive measurement of oxygen saturation of arterial blood in tissue of a patient, comprising:
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a first source of electromagnetic radiation at a first wavelength; a second source of electromagnetic radiation at a second wavelength; means for positioning said first and second sources of electromagnetic radiation on the patient so as to illuminate a sample of blood in the tissue; detecting means for receiving electromagnetic radiation reflected by said sample of blood; data processing means for calculating the blood oxygen saturation of said tissue responsive to said detected reflected electromagnetic radiation; and means for maintaining said tissue at a predetermined temperature comprising; a light emitting diode; a thermal sensor having an output signal indicative of the temperature of said tissue; safety means coupled to said means for maintaining for disabling said means for maintaining thereby preventing thermal burns to said tissue in the event of a system failure, said safety means further comprising a thermal sensor failure circuit for detecting a failure in said thermal sensor and means for disabling said light emitting diode when said failure is detected.
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19. A blood oxygen saturation monitoring system for noninvasive measurement of oxygen saturation of arterial blood in tissue of a patient, comprising:
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a first source of electromagnetic radiation at a first wavelength; a second source of electromagnetic radiation at a second wavelength; means for positioning said first and second sources of electromagnetic radiation on the patient so as to illuminate a sample of blood in the tissue; detecting means for receiving electromagnetic radiation reflected by said sample of blood; data processing means for calculating the blood oxygen saturation of said tissue responsive to said detected reflected electromagnetic radiation; and means for maintaining said tissue at a predetermined temperature comprising; a light emitting diode; a thermal sensor having an output signal indicative of the temperature of said tissue; safety means coupled to said means for maintaining for disabling said means for maintaining thereby preventing thermal burns to said tissue in the event of a system failure, said safety means further comprising a power sensing circuit for monitoring the power delivered to said light emitting diode and means for disabling said light emitting diode if the power delivered exceeds a predetermined value.
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Specification