Multiple wavelength optical sensor
AssigneeCercacor Laboratories, Inc.
InventorsAmmar Al-Ali, Mohamed K. Diab, Arun Panch, Yassir Abdul-Hafiz, William Jack MacNeish, III
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Abstract
A multiple wavelength optical sensor has an emitter configured to radiate light having a plurality of wavelengths into a tissue site. The emitter comprises a plurality of LEDs configured in an array and connected within an electrical grid. A detector is configured to receive the light after absorption by pulsatile blood flow within the tissue site. The detector generates a sensor signal capable of being processed by a patient monitor so as to derive oxygen saturation, carboxyhemoglobin, methemoglobin and total hemoglobin.
Claims21
A physiological sensor comprising:
- an emitter that emits light having a plurality of wavelengths;
- a detector that generates an output signal responsive to the emitted light after absorption by tissue, the detector comprising a plurality of Si photodiodes and at least one InGaAs photodiode connected in parallel;
- an attachment assembly that removably attaches the emitter and the detector to tissue;
- a spacer that provides a predetermined gap between the emitter and tissue when the emitter is attached to tissue;
- and
- a light scattering medium disposed in an optical path between the emitter and tissue;
- the spacer and the light scattering medium providing at least a substantially uniform illumination of tissue by the emitted light for at least one of the wavelengths,
- wherein the at least one InGaAs photodiode is mounted interspersed with the plurality of Si photodiodes.
A physiological sensor comprising:
- an emitter configured to radiate light having a plurality of wavelengths into a tissue site;
- the emitter comprises a plurality of LEDs disposed within an emitter ceramic substrate;
- a detector configured to receive the light after absorption by pulsatile blood flow within the tissue site;
- the detector generates a sensor signal capable of being processed by a patient monitor so as to derive total hemoglobin (Hbt);
- the detector comprises a plurality of photodiodes disposed within a detector ceramic substrate;
- and
- a first set of the photodiodes is responsive to a first set of the wavelengths and a second set of the photodiodes is responsive to a second set of the wavelengths,
- wherein the plurality of photodiodes comprises a plurality of Si photodiodes and at least one InGaAs photodiode connected in parallel, and wherein the at least one InGaAs photodiode is mounted interspersed with the plurality of Si photodiodes.
A physiological sensor comprising:
- a light source that radiates light having a plurality of wavelengths;
- a diffuser that scatters the radiated light so that a tissue site is uniformly illuminated across all of the wavelengths;
- and
- at least one detector that generates a sensor signal responsive to the radiated light after tissue attenuation, the at least one detector comprising a plurality of Si photodiodes and at least one InGaAs photodiode connected in parallel, wherein the at least one InGaAs photodiode is mounted interspersed with the plurality of Si photodiodes.
Dependencies are inferred from the claim text.