Pulse oximeter sensor with piece-wise function
AssigneeNellcor Puritan Bennett LLC
InventorsPaul D. Mannheimer, Michael E. Fein, Charles E. Porges
Life of this patent
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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.
Claims12
An oximeter sensor comprising:
- a light emitter for directing light at a patient;
- a light detector mounted to receive light from said patient;
- and
- a memory storing coefficients for use in first and second different formulas for determining oxygen saturation.
An oximeter sensor comprising:
- a light emitter for directing light at a patient;
- a light detector mounted to receive light from said patient;
- and
- a memory storing coefficients for use in first and second different formulas for determining oxygen saturation,
- said memory further storing an indication of a saturation for use in selecting between said first and second formulas.
An oximeter sensor comprising:
- a light emitter for directing light at a patient;
- a light detector mounted to receive light from said patient;
- and a memory storing a plurality of alternate values of oxygen saturation or ratio-of-ratio values used to determine oxygen saturation, said plurality of values corresponding to a mean wavelength of said light emitter.
Dependencies are inferred from the claim text.