Piezoelectric apparatus for measuring bodily fluid pressure within a conduit
US4600855A · kind A · utility
123Cited by
67References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 30, 1985 |
| Grant date | Jul 15, 1986 |
| Priority date | — |
| Expiry date | May 30, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S310/80
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for measuring pressure within a conduit is disclosed preferably comprising a tube whose resonant frequency varies with the pressure of fluid within the tube; means for passing the fluid to be measured through the tube; two active piezoelectric films disposed in intimate contact with the tube on opposite sides thereof; first electronic means for energizing the first of the films to cause the tube to resonate at its natural frequency, and second electronic means connected to the other of the films to monitor the frequency of the tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.