Patent ID: 9295410
Filing Date: 2016-03-29
CPC Classification: A61B,G01F

Claim Text:
1. A mainstream sensor comprising: an airway adapter comprising a flow channel configured to carry a respiratory gas; and a gas analyzer configured to measure oxygen concentration of the respiratory gas, the gas analyzer comprising a vortex flow meter, the vortex flow meter comprising a bluff body and a vortex flow meter detector assembly configured to measure a signal indicative of vortices formed downstream of the bluff body, wherein the bluff body comprises a surface at least partially coated with a luminophore that is excited by received radiation, wherein the luminophore emits luminescent radiation indicative of oxygen concentration of the respiratory gas when the luminophore is in contact with the respiratory gas, and wherein the bluff body further comprises a transparent radiation path surrounded by the surface, the bluff body being configured to guide at least one of the received radiation and the luminescent radiation emitted by the luminophore.