Pressure gauge and system

Details Pressure gauge and system Pressure gauge and system

1987-08-24

1988-12-13

Howell, Kyle L.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604100, 128748, 73706, 73744, A61M 2500

Patent

active

047908211

ABSTRACT:
A pressure gauge which may be operably coupled to a fluid pressure supply device and a balloon catheter. The pressure gauge includes a mechanism which impedes a contaminant, such as corrosion and acid flux, from entering the pressurized fluid being measured. In one embodiment, this mechanism may include a piston positioned in a piston chamber. The piston has at least one, and preferably two, O-rings nested therearound to provide a seal with the piston chamber's wall. The piston may include an inter-gasket pressure chamber positioned between two O-rings which is communicated to the top or bottom of the piston, resulting in pressure equilibrium. Several inter-gasket pressure chambers may be provided.

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patent: 2628139 (1953-02-01), Gilliand
patent: 2841984 (1958-07-01), Green
patent: 2986938 (1961-06-01), Grandstaff
patent: 3415123 (1968-12-01), Broughton
patent: 3442134 (1969-05-01), Bennett et al.
patent: 3496776 (1970-02-01), Mistarz
patent: 3975967 (1976-08-01), Conti
patent: 4278856 (1981-07-01), Owens
patent: 4370982 (1983-01-01), Reilly
patent: 4508103 (1985-04-01), Calisi
patent: 4552153 (1985-11-01), Newman et al.

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