Resistive element for spirometer
US5743270A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1996 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | Jun 21, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/0876
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present air tubes include a resistive element which is located in the hollow space of the tubular portion. This resistive element is adapted for providing a linear resistance-versus-pressure response is sized and adapted to cause a pressure difference or differential as air flows in the hollow space across this element. The resistive element includes a planar member having a first face and a second face, and a circular parameter connecting the first face to the second face. An aperture is formed in a center of the planar member for connecting the first face to the second face. A plurality of slots in the planar member extend radially from the aperture, thereby forming a plurality of hinged windows in the planar member. Each of the slots includes a central end and a distal end. The resistive element further includes a plurality of hinge slots. Each hinge slot is connected to a distal end of a slot, and extends generally perpendicularly to an axis of the slot. A total number of hinge slots corresponds to a total number slots.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.