Method and apparatus for measuring the concentration of a given component in a gas inhaled and/or exhaled by a patient
US4509359A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1982 |
| Grant date | Apr 9, 1985 |
| Priority date | — |
| Expiry date | Dec 10, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/0016
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
For the purpose of measuring the concentration of one or more given components of the breathing gas of a patient there is removed a small part of the breathing gas at a location immediately in front of the mouth of the patient. The withdrawn gas is passed to a measuring instrument sensitive to the component or components of interest through a line which comprises, at least in part, a thin tube of a fluorosulfonyl polymer, and the outer surface of which is in free contact with the ambient air. In this way, the temperature and relative humidity of the breathing gas supplied to the measuring instrument are brought into agreement with the temperature and relative humidity of the ambient air. By calibrating the measuring instrument with respect to the temperature and relative humidity of the surrounding air prior to carrying out the measuring operation, the measuring procedure can be carried out without disturbances caused by variations in the relative humidity and temperature of the breathing gas removed for measuring purposes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.