Respiratory air flow sensor
US5925831A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1998 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | Oct 14, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/3504
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The air flow sensor for a respiratory air flow measuring systems includes a tubular member for providing an air passageway for the flow of air between a patient and a ventilator. The passageway includes a fixed orifice-type obstruction comprised of a plurality of aerodynamically curved vanes which produce a pressure drop as the air flows through the passageway. The air flow rate of the patient's respirations is calculated by measuring the pressure differential between two longitudinally spaced apart pressure measuring air ports bored within one of the vanes in the air flow sensor. A third air port hole extracts respiratory gas samples for content analysis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.