Method for determining gas content in a breathing apparatus, and a breathing apparatus operating according to the method
US6450968B1 · kind B1 · utility
40Cited by
3References
16Claims
0Family size
Assignee
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Key dates
| Filing date | Sep 1, 2000 |
| Grant date | Sep 17, 2002 |
| Priority date | — |
| Expiry date | Sep 1, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/02881
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a method for determining the gas content, e.g. of oxygen in breathing gas in a breathing apparatus, and a breathing apparatus operating according to the method, the gas content is determined from the speed of sound in the breathing gas. In order to resolve the problems caused by temperature variations in gas samples, determination of the speed of sound is synchronized with one or more specific times in a respiratory cycle. Determination can then be made when conditions are most stable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.