Signals and indicators – Indicators – Fluid flow
Patent
1980-09-05
1983-09-20
Yasich, Daniel M.
Signals and indicators
Indicators
Fluid flow
92 92, 116266, 128760, 604118, A61M 100, G01L 1912
Patent
active
044049242
ABSTRACT:
A medical suction device is disclosed which includes a vacuum indicator flag. This flag is made up of a flexible tube capped with a plug. The rigidity of the walls of the tube is chosen such that the walls collapse when the pressure inside the tube falls below a predetermined value, thereby allowing the flag to droop. In addition the rigidity of the tube serves to hold the flag upright when the pressure inside the tube rises above a second predetermined value. Thus the state of the flag (upright or drooped) provides a remote indication of the pressure being developed by the suction device. In addition, the suction device uses a constant force coiled ribbon spring to provide substantially constant suction as the suction device is filled. Furthermore, the suction device includes a plurality of separately valved drainage receptacles which can be folded and stored compactly against the drainage device. By sequentially filling each of these receptacles and then removing the respective receptacle from the drainage device only after the respective isolation valve has been closed, relatively large volumes can be drained without opening the suction device to atmosphere.
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Bazell Seymour
Goldberg Edward M.
Lettvin Norman
UreSil Company
Yasich Daniel M.
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