Strain gauge for medical pressure measurements

Details Strain gauge for medical pressure measurements Strain gauge for medical pressure measurements

1984-09-17

1986-05-20

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

128675, 338 4, 338 42, G01L 906

Patent

active

045892873

ABSTRACT:
A disposable strain gauge pressure sensor providing reliable electrical isolation even at defibrillation voltages in the measurement of biological fluid pressures is produced by floatingly mounting a glass plate on a closed cell, fluid-impervious foam pad within a firm but not totally rigid plastic housing. The glass plate has a thin glass diaphragm integrally formed therein which carries the strain gauge element. Openings in the foam pad and the housing allow a fluid contained in a fluid dome on the outside of the housing to bathe the side of the glass diaphragm opposite that on which the strain gauge element is mounted. The glass plate, foam pad, and housing are bonded together in fluid-tight relationship so that fluid cannot reach anything within the housing other than the glass diaphragm. The housing is preferably transparent to allow observation of the diaphragm during operation.

REFERENCES:
patent: 4274423 (1981-06-01), Mizuno et al.
patent: 4373397 (1983-02-01), Keller

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