Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1997-08-18
1999-05-18
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604 49, 604131, A61M5/00
Patent
active
059046660
ABSTRACT:
An apparatus for measuring flow rate and controlling delivered volume of fluid flow in a fluid conduit is disclosed including a valve having a fixed aperture disposed in the fluid conduit for selectively opening and closing the aperture between an open position and a closed position. The valve is selectively closed when a predetermined volume has passed through the valve. Differential pressure is measured across the valve and the differential pressure is accumulated with respect to time to provide a value corresponding to volume of fluid flow passing through the valve when in the open position. A method for measuring flow rate and controlling delivered volume of fluid flow through a fluid conduit includes the steps of selectively opening and closing a valve having a fixed aperture disposed in the fluid conduit between an open position and a closed position, measuring a differential pressure between a first pressure on an upstream side of the valve and a second pressure on a downstream side of the valve, and when the valve is in the open position, accumulating the differential pressure with respect to time to obtain a value corresponding to volume of fluid flow passing through the valve.
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International Search Report, Jul. 17, l998 for International Application No. PCT/US97/24041.
DeDecker Paul G.
Freed Paul S.
L.Vad Technology, Inc.
Yasko John D.
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