METHOD AND APPARATUS FOR CALIBRATING AN ABSOLUTE OXYGEN SATURATION SENSOR
First Claim
1. A method for using a medical device comprising an optical sensor to measure calibrated oxygen saturation in a body tissue, the method comprising:
- establishing a standard spectral response of blood for a plurality of oxygen saturations;
establishing a standard spectral response of a reference material;
determining the spectral power output of the optical sensor;
obtaining the optical sensor output signal response to the reference material;
determining a calibration curve for the optical sensor using the measured spectral power output and the standard spectral response of blood and determining an optical gain using the standard spectral response of the reference material and the measured spectral power output of the optical sensor; and
storing the calibration curve and the optical gain.
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Abstract
A method for using a medical device comprising an optical sensor to measure calibrated oxygen saturation in a body tissue uses a standard spectral response of blood established for multiple of oxygen saturations and a standard spectral response of a reference material. The standard responses are established using a spectrometer. The spectral power output of the optical sensor is measured using a spectrometer. The optical sensor output signal response to the reference material is obtained. A processor computes a device-specific calibration curve for the medical device using the measured spectral power output and the standard spectral response of blood and computes an optical gain using the standard spectral response of the reference material and the measured spectral power output of the optical sensor. The device-specific calibration curve and optical gain of the optical sensor are stored in a memory of the medical device.
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Citations
20 Claims
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1. A method for using a medical device comprising an optical sensor to measure calibrated oxygen saturation in a body tissue, the method comprising:
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establishing a standard spectral response of blood for a plurality of oxygen saturations; establishing a standard spectral response of a reference material; determining the spectral power output of the optical sensor; obtaining the optical sensor output signal response to the reference material; determining a calibration curve for the optical sensor using the measured spectral power output and the standard spectral response of blood and determining an optical gain using the standard spectral response of the reference material and the measured spectral power output of the optical sensor; and storing the calibration curve and the optical gain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A medical device system for measuring absolute oxygen saturation in a body tissue, the system comprising:
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an optical sensor; a memory storing a standard spectral response of blood for a plurality of oxygen saturations using a spectrometer and a standard spectral response of a reference material; a control processor coupled with the optical sensor and the memory, the processor configured to; cause to the optical sensor to emit light to enable measuring the spectral power output of the optical sensor, acquire the optical sensor output signal response to the reference material, compute a calibration curve for the optical sensor using the measured spectral power output and the standard spectral response of blood, and compute an optical gain using the standard spectral response of the reference material and the measured spectral power output of the optical sensor; and a sensor memory coupled to the optical sensor to store the computed calibration curve and the optical gain. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification