Electret transducer for blood pressure measurement

Details Electret transducer for blood pressure measurement Electret transducer for blood pressure measurement

1984-09-14

1986-07-08

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

73729, 361283, G01L 912

Patent

active

045985901

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.

REFERENCES:
patent: 3118979 (1964-01-01), Sessler et al.
J. E. West and I. J. Busch-Vishniac, "Foil Electret Transducer for Blood Pressure Monitoring," J. Acoust. Soc. Am., 74(3), 680-686 (Sep. 1983).

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