Method of in vivo calibration of a pressure sensor
US4886070A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 1988 |
| Grant date | Dec 12, 1989 |
| Priority date | — |
| Expiry date | May 11, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L27/002
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An improved miniature, in vivo, pressure sensor is disclosed which comprises a housing having an internal chamber adapted to be connected to a conduit for varying the pressure therein; a piezoresistive element positioned in the chamber and adapted to be connected to a circuit for sensing changes in the resistance of the piezoresistive element; a pressure responsive element carried by the housing and having an inner portion and an outer portion, the inner portion being exposed to the pressure extant in the interanl chamber and the outer portion being exposed to ambient pressure conditions outside of the housing; and a coupling device releasably coupling the pressure responsive element to the piezoresistive element in such a manner that when equal pressures are concurrently applied to the inner and outer portions of the pressure responsive element, the pressure responsive element applies a predetermned load to thre piezoresistive element and when unequal pressures are concurrently applied to the inner and outer portions of the pressure responsive element, the load applied by the pressure responsive element to the piezoresistive element correspondingly changes. A method fo checking th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.