Peak flow meter
US6314822A · kind A · utility
7Cited by
4References
13Claims
0Family size
Inventor
Key dates
| Filing date | Mar 15, 1999 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Mar 15, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/0873
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An air-flow measuring device for measuring respiratory performance includes a valve having at least one rotary blade for detecting air-flow through the device. The valve includes at least one air-directing aperture which alters the direction of air-flow incident on said valve from a first direction onto a second altered direction. The second direction is perpendicular to the first direction and to the planar surface of the rotary blade. The direction-altered air-flow provides a force which causes the rotary blade to move. An optical transducer measures the rotation of the blade to determine air-flow parameters in the device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.