Pulse oximeter sensor with piece-wise function
First Claim
Patent Images
1. An oximeter sensor comprising:
- a light emitter for directing light at a patient;
a light detector mounted to receive light from the patient; and
a memory storing a first formula for determining oxygen saturation, a second formula for determining oxygen saturation, a first set of coefficients corresponding to a wavelength of the light emitter for use in the first formula, and a second set of coefficients corresponding to the wavelength of the light emitter for use in the second formula, wherein the first formula differs from the second formula.
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Abstract
A memory in a sensor is used to store multiple coefficients for a physiological parameter. In one embodiment, not only are the sensor'"'"'s specific calibration coefficients stored in a memory in the sensor for the formula to determine oxygen saturation, but multiple sets of coefficients are stored. The multiple sets apply to different ranges of saturation values to provide a better fit to occur by breaking the R to SpO2 relationship up into different pieces, each described by a different function. The different functions can also be according to different formulas for determining oxygen saturation.
655 Citations
33 Claims
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1. An oximeter sensor comprising:
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a light emitter for directing light at a patient; a light detector mounted to receive light from the patient; and a memory storing a first formula for determining oxygen saturation, a second formula for determining oxygen saturation, a first set of coefficients corresponding to a wavelength of the light emitter for use in the first formula, and a second set of coefficients corresponding to the wavelength of the light emitter for use in the second formula, wherein the first formula differs from the second formula. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An oximeter sensor system comprising:
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a light emitter for directing light at a patient; a light detector mounted to receive light from the patient; and a memory, mounted in a sensor or between the sensor and an oximeter monitor, the memory storing an indication of a breakpoint, first and second sets of coefficients corresponding to a same wavelength of the light emitter, and first and second formulas for determining oxygen saturation, the oximeter monitor selecting between the first and second sets of coefficients and the first and second formulas for determining oxygen saturation based at least in part on the breakpoint. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An oximeter sensor comprising:
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a light emitter for directing light at a patient; a light detector mounted to receive light from the patient; and a memory storing at least two different algorithms, and a plurality of alternate values of oxygen saturation or ratio-of-ratio values used in the at least two different algorithms to determine oxygen saturation, the plurality of values corresponding to the same mean wavelength of the same light emitter. - View Dependent Claims (17)
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18. A pulse oximeter system comprising:
a pulse oximeter sensor comprising; a light emitter for directing light at a patient; a light detector mounted to receive light from the patient; and a memory storing a first formula for determining oxygen saturation, a second formula for determining oxygen saturation, a first set of coefficients corresponding to a wavelength of the light emitter for use in the first formula, and a second set of coefficients corresponding to the wavelength of the light emitter for use in the second formula, wherein the first formula differs from the second formula; and a pulse oximeter monitor configured to receive communications from the pulse oximeter sensor and configured to perform calculations using one or both of the first and second formulas to estimate oxygen saturation in blood of the patient. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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26. An oximeter system comprising:
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an oximeter sensor, comprising; a light emitter configured to direct light at a patient; a light detector mounted to receive light from the patient; and a sensor memory storing a first formula for determining oxygen saturation, a second formula for determining oxygen saturation, a first set of coefficients corresponding to a wavelength of the light emitter, and a second set of coefficients corresponding to the wavelength of the light emitter; an oximeter monitor, comprising; a calculation mechanism configured to determine a blood oxygen saturation in the patient, wherein the calculation mechanism selects and utilizes the first set of coefficients in the first formula for a first range of oxygen saturation values and selects and utilizes the second set of coefficients in the second formula for a second range of oxygen saturation values, wherein the first range differs from the second range. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33)
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Specification