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AssigneeMasimo Corporation
InventorsMOHAMED KHEIR DIAB, ESMAIEL KIANI-AZARBAYJANY, CHARLES ROBERT RAGSDALE, JAMES M. LEPPER JR.
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The method and apparatus of the present invention provides a system wherein light-emitting diodes (LEDs) can be tuned within a given range by selecting their operating drive current in order to obtain a precise wavelength. The present invention further provides a manner in which to calibrate and utilize an LED probe, such that the shift in wavelength for a known change in drive current is a known quantity. In general, the principle of wavelength shift for current drive changes for LEDs is utilized in order to allow better calibration and added flexibility in the use of LED sensors, particularly in applications when the precise wavelength is needed in order to obtain accurate measurements. The present invention also provides a system in which it is not necessary to know precise wavelengths of LEDs where precise wavelengths were needed in the past. Finally, the present invention provides a method and apparatus for determining the operating wavelength of a light emitting element such as a light emitting diode.
An medical sensor comprising:
An oximeter sensor comprising:
A medical monitor comprising:
An identification system for a medical sensor for use with a medical monitor, the medical monitor having a first signal line which provides control for said medical sensor and which receives information about said medical sensor, said medical sensor having a light emitting element configured to receive control signals on said first signal line, said identification system comprising:
The identification system of claim 35, and wherein said light emitting element is active at or above a first voltage and inactive below said first voltage, said information element responsive to a voltage below said first voltage to provide said information on said first signal line.
The identification system of claim 36, wherein said light emitting element is responsive to a voltage at or above said first voltage on said first signal line to emit light of a selected wavelength.
The identification system of claim 37, wherein said information is information about said selected wavelength.
The identification system of claim 40, wherein said information element is an impedance element.
The identification system of claim 41, wherein said information element is a resistor.
Dependencies are inferred from the claim text.