Electret transducer for blood pressure measurement
US4598590A · kind A · utility
7Cited by
1References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1984 |
| Grant date | Jul 8, 1986 |
| Priority date | — |
| Expiry date | Sep 14, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2562/0204
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A back electrode has a plurality of ridges on one surface. An electret foil is spaced from the ridged surface of the back electrode. In the absence of applied pressure, a gap remains between the foil and the surface of the back electrode between the ridges. Above one applied pressure, the foil collapses between the ridges. Below a second applied pressure, the foil returns to its original position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.