Adaptive calibration pulsed oximetry method and device
First Claim
1. A method of calibrating an oximeter and determining an arterial blood oxygen saturation level in tissue, comprising:
- using a plurality of measurements to determine properties of a light transmission passing through or reflected from a tissue; and
using the properties of the light transmission or reflection to select a calibration curve, said calibration curve representing a level of arterial blood oxygen saturation in relation to a pulsatile factor.
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Abstract
A method for determining an arterial blood oxygen saturation level according to this invention includes measuring the light transmittance through tissue of light of a first wavelength and a second wavelength. A steady-state component of the measured light transmission is used to select an appropriate calibration curve. A pulsatile component of the measured light transmission is used to determine the arterial blood oxygen saturation level using the selected calibration curve. An oximetry system is also provided. An improved oximetry system is further provided wherein a plurality of light transmission measurements are used to determine a blood oxygen saturation level.
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Citations
25 Claims
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1. A method of calibrating an oximeter and determining an arterial blood oxygen saturation level in tissue, comprising:
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using a plurality of measurements to determine properties of a light transmission passing through or reflected from a tissue; and
using the properties of the light transmission or reflection to select a calibration curve, said calibration curve representing a level of arterial blood oxygen saturation in relation to a pulsatile factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An oximetry apparatus, comprising:
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a plurality of light sources arranged in various locations in proximity to a tissue sample;
a plurality of detectors arranged to detect light transmitted from the plurality of light sources onto the tissue sample;
a measurement device configured to receive signals from the light detectors and provide measurements for a plurality of variables; and
a calculation device configured to use the measurements from the measurement device to calculate an oxygen saturation level. - View Dependent Claims (19, 20)
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21. An oximetry apparatus, comprising:
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a light source configured to transmit light onto a tissue sample;
a light detector arranged to detect the light transmitted from the light source onto the tissue sample;
a measurement device configured to receive signals from the light detector and obtain a plurality of measurements to determine values for a plurality of variables;
means for varying the characteristics of the light transmitted from the light source to produce the plurality of measurements; and
a calculation device configured to use the variable values to determine a blood oxygen saturation level of the tissue sample. - View Dependent Claims (22, 23, 24, 25)
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Specification