Patent ID: 9510774
Filing Date: 2016-12-06
CPC Classification: A61B,G01J,G01N

Claim Text:
1. A gas measurement module configured to be inserted into a ventilation circuit that is in fluid communication with an airway of a subject, the gas measurement module comprising: a chamber having a first opening and a second opening, wherein the chamber is configured to form a flow path between the first opening and the second opening such that if the gas measurement module is inserted into the ventilation circuit, gas from the airway of the subject is transported through the flow path; an infrared source configured to emit infrared electromagnetic radiation; a collimating reflective optical element configured to receive infrared electromagnetic radiation emitted by the infrared source, to collimate or substantially collimate the received infrared electromagnetic radiation, and to direct the collimated or substantially collimated infrared electromagnetic radiation along an optical path that passes through the flow path formed by the chamber, wherein the collimating reflective optical element has a reflective surface that comprises a parabolic shaped reflector formed from an off-axis parabolic section; a diffractive reflective optical element configured to receive collimated or substantially collimated infrared electromagnetic radiation along the optical path, and to diffract the received collimated or substantially collimated infrared electromagnetic radiation; and a photosensitive detector configured to receive diffracted infrared electromagnetic radiation that has passed through the flow path formed by the chamber from the diffractive reflective optical element, and to generate output signals that convey information related to one or more parameters of the received infrared electromagnetic radiation.