MANUAL AND AUTOMATIC PROBE CALIBRATION
First Claim
1. A method to obtain physiological data relating to a physiological parameter without knowing precise operating wavelengths of one or more light emitting devices in an oximeter sensor, the method comprising:
- driving a first light emitting device with a first drive current to generate a first light energy having a first wavelength;
transmitting the first light energy through a medium under test to result in a first attenuated light energy;
driving the first light emitting device with a second drive current to generate a second light energy having a second wavelength, wherein the second drive current has a different current level than the first drive current, the first wavelength and the second wavelength fall within a first predetermined range of operating wavelengths, and a difference between the first wavelength and the second wavelength is approximately equal to a preselected wavelength shift;
transmitting the second light energy through the medium under test to result in a second attenuated light energy;
driving a second light emitting device with a third drive current to generate a third light energy having a third wavelength, wherein the third wavelength falls within a second predetermined range of operating wavelengths and is distinct from the first wavelength and the second wavelength;
transmitting the third light energy through the medium under test to result in a third attenuated light energy; and
calculating the physiological parameter based on the first attenuated light energy, the second attenuated light energy, the third attenuated light energy, and the preselected wavelength shift.
3 Assignments
0 Petitions
Accused Products
Abstract
Embodiments of the present disclosure include an optical probe capable of communicating identification information to a patient monitor in addition to signals indicative of intensities of light after attenuation by body tissue. The identification information may indicate operating wavelengths of light sources, indicate a type of probe, such as, for example, that the probe is an adult probe, a pediatric probe, a neonatal probe, a disposable probe, a reusable probe, or the like. The information could also be utilized for security purposes, such as, for example, to ensure that the probe is configured properly for the oximeter, to indicate that the probe is from an authorized supplier, or the like. In one preferred embodiment, coding resistors could be provided across the light sources to allow additional information about the probe to be coded without added leads. However, any device could be used without it being used in parallel.
99 Citations
23 Claims
-
1. A method to obtain physiological data relating to a physiological parameter without knowing precise operating wavelengths of one or more light emitting devices in an oximeter sensor, the method comprising:
-
driving a first light emitting device with a first drive current to generate a first light energy having a first wavelength; transmitting the first light energy through a medium under test to result in a first attenuated light energy; driving the first light emitting device with a second drive current to generate a second light energy having a second wavelength, wherein the second drive current has a different current level than the first drive current, the first wavelength and the second wavelength fall within a first predetermined range of operating wavelengths, and a difference between the first wavelength and the second wavelength is approximately equal to a preselected wavelength shift; transmitting the second light energy through the medium under test to result in a second attenuated light energy; driving a second light emitting device with a third drive current to generate a third light energy having a third wavelength, wherein the third wavelength falls within a second predetermined range of operating wavelengths and is distinct from the first wavelength and the second wavelength; transmitting the third light energy through the medium under test to result in a third attenuated light energy; and calculating the physiological parameter based on the first attenuated light energy, the second attenuated light energy, the third attenuated light energy, and the preselected wavelength shift. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. An oximeter system comprising:
-
a detachable sensor comprising; a first light emitting device configured to receive two or more different drive levels and to generate corresponding light signals having different respective operating wavelengths; and a photodetector configured to detect intensities of respective attenuated light signals produced by transmitting the light signals through human tissue carrying blood; and a monitor configured to provide the different drive levels to the first light emitting device and to receive the detected intensities from the photodetector, wherein the monitor determines a physiological measurement based at least in part on the detected intensities and without knowing the operating wavelengths of the first light emitting device associated with the detected intensities. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
-
Specification