Gas measurement system

• US 8,080,798 B2
• Filed: 02/13/2009
• Issued: 12/20/2011
• Est. Priority Date: 02/21/2003
• Status: Active Grant

• Current Assignee: Philips RS North America LLC (Koninklijke Philips N.V.)
• Original Assignee: RIC INVESTMENTS LLC (Respironics Incorporated)
• Inventors: Russell, James T.
• Primary Examiner(s): Porta, David
• Assistant Examiner(s): TANINGCO, MARCUS H
• Application Number:
  US12/371,151
• Publication Number:
  US 20090146062A1
• Time in Patent Office: 1,040 Days
• Field of Search: 250/343
• US Class Current: 250/343
• CPC Class Codes: A61B 2562/0233 Special features of optical sensors or probes classified in A61B5/00
• CPC Class Codes: A61B 2562/166 the sensor is mounted on a specially adapted printed circuit board
• CPC Class Codes: A61B 2562/185 Optical shielding, e.g. baffles
• CPC Class Codes: A61B 5/0803 Recording apparatus specially adapted therefor
• CPC Class Codes: A61B 5/083 Measuring rate of metabolism by using breath test, e.g. measuring rate of oxygen consumption
• CPC Class Codes: A61B 5/0833 Measuring rate of oxygen consumption
• CPC Class Codes: A61B 5/0836 Measuring rate of CO2 production
• CPC Class Codes: A61B 5/097 Devices for facilitating collection of breath or for directing breath into or through measuring devices
• CPC Class Codes: G01J 3/36 Investigating two or more bands of a spectrum by separate detectors
• CPC Class Codes: G01N 2021/6432 Quenching
• CPC Class Codes: G01N 2021/7786 Fluorescence
• CPC Class Codes: G01N 21/314 with comparison of measurements at specific and non-specific wavelengths dual wavelength spectrometry G01J3/427
• CPC Class Codes: G01N 21/3504 for analysing gases, e.g. multi-gas analysis
• CPC Class Codes: G01N 21/77 by observing the effect on a chemical indicator
• CPC Class Codes: G01N 33/004 for CO, CO2

Abstract

A gas measurement system includes a housing adapted to be mounted on an airway adapter, and a luminescence quenching gas measurement assembly disposed in the housing. The luminescence quenching gas measurement assembly includes a source disposed in a first plane, and at least one detector also disposed in the first plane.

Claims

1. A gas measurement system assembly comprising:

(a) a housing adapted to be mounted on an airway adapter; and

(b) a luminescence quenching gas measurement assembly disposed in the housing, comprising;

(1) a source with an emitting surface disposed in a first plane for providing incident radiation incident on a sensing film, and

(2) a plurality of detectors having detecting surfaces also disposed in the first plane, wherein each of the detecting surfaces faces the sensing film in the airway adapter to receive direct radiation from the sensing film responsive to the incident radiation from the source.

2. The system of claim 1, wherein the plurality of detectors are disposed proximate to the source.

3. The system of claim 1, wherein the plurality of detectors include a first detector disposed on a first side of the source, and a second detector disposed on a second side of the source.

4. The system of claim 1, wherein the housing is generally U-shaped.

5. The system of claim 1, further comprising a processor disposed in the housing, wherein the processor is programmed to measure a gas constituent of a gas flow in the airway adapter based on an output of the plurality of detectors.

6. The system of claim 1, further comprising a filter over the plurality of detectors, wherein the filter passes wavelengths of radiation related to luminescence quenching and substantially blocks other wavelengths.

7. The system of claim 1, further comprising an optical shield disposed around at least a portion of the source.

8. The system of claim 1, further comprising an infrared absorption gas measurement assembly disposed in the housing.

9. The system of claim 8, wherein the housing has a generally U-shaped configuration having a first leg and a second leg, wherein the infrared absorption gas measurement assembly comprises a source assembly disposed in the first leg and a detector assembly disposed in the second leg, and wherein the luminescence quenching gas measurement assembly is disposed in the housing between the first leg and the second leg.

10. The system of claim 1, wherein the first plane is parallel to a sensing film in the airway adapter.

11. The system of claim 1, wherein the direct radiation from the sensing film is not reflected in paths between the sensing film and the plurality of detector.

12. A gas measurement system, comprising:

(a) a conduit adapted to carry a flow of gas;

(b) a sensing film in communication with the flow of gas in the conduit;

(c) a luminescence quenching gas measurement assembly adapted to measure a constituent of the flow of gas, wherein the luminescence quenching gas measurement assembly comprises;

(1) a radiation source with an emitting surface disposed in a first plane substantially parallel to the sensing film for providing incident radiation incident on the sensing film, and

(2) a plurality of detectors having detecting surfaces also disposed in the first plane, wherein each of the detecting surfaces faces the sensing film to receive direct radiation from the sensing film responsive to the incident radiation from the radiation source.

13. The system of claim 12, further comprising an airway adapter selectively coupled to the conduit, wherein the sensing film is disposed on the airway adapter.

14. The system of claim 12, wherein the plurality of detectors are disposed proximate to the radiation source.

15. The system of claim 12, wherein the plurality of detectors include a first detector disposed on a first side of the radiation source, and a second detector disposed on a second side of the radiation source.

16. The system of claim 12, further comprising a housing adapted to be selectively coupled to the conduit, wherein the luminescence quenching gas measurement assembly is disposed in the housing.

17. The system of claim 16, further comprising a processor disposed in the housing, wherein the processor is programmed to measure a gas constituent of a flow of gas in the conduit based on an output of a detector of the plurality of detectors.

18. The system of claim 16, further comprising an infrared absorption gas measurement assembly disposed in the housing.

19. The system of claim 18, wherein the housing has a generally U-shaped configuration having a first leg and a second leg, wherein the infrared absorption gas measurement assembly comprises a source assembly disposed in the first leg and a detector assembly disposed in the second leg, and wherein the luminescence quenching gas measurement assembly is disposed in the housing between the first leg and the second leg.

20. The system of claim 12, further comprising a filter disposed over the plurality of detectors, wherein the filter passes wavelengths of radiation related to luminescence quenching and substantially blocks other wavelengths.

21. The system of claim 12, wherein the direct radiation from the sensing film is not reflected in paths between the sensing film and the plurality of detector.