Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1977-03-28
1979-07-03
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
128351, 137498, 137557, A61M 2500
Patent
active
041597222
ABSTRACT:
An improved pressure regulator for an inflatable cuff on an endotracheal tube or the like includes a housing which contains a valve assembly and a pressure regulating chamber. The housing is adapted to be connected to an inflatable cuff so that the pressure regulating chamber communicates with the cuff through the valve assembly. The valve assembly (1) permits slow increases in air pressure in the cuff to be transferred into the pressure regulating chamber, thereby preventing over-inflation of the cuff, and (2) closes in response to relatively rapid pressure changes in the cuff to prevent collapsing of the cuff when the pressure of the air or other gas delivered through the endotracheal tube (e.g., by a respirator) is relatively high. A spring-biased piston is disposed in the pressure regulating chamber for regulating the pressure in an inflatable cuff to which the regulator housing is connected, and a rolling diaphragm covers the piston. The housing is constructed of a transparent material so as to provide attending personnel with a visual indication of the pressure in the pressure regulating chamber and a cuff to which the housing is connected.
REFERENCES:
patent: 2710626 (1955-06-01), Burdick et al.
patent: 3390696 (1968-06-01), Dawson
patent: 3529596 (1970-09-01), Gardner
patent: 3731691 (1973-05-01), Chen
patent: 3794043 (1974-02-01), McGinnis
Gardner Paul L.
Nilson Robert G.
Sherwood Medical Industries Inc.
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