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AssigneeBaxter Travenol Laboratories, Inc.
InventorsScott T. Garrett, Thurman S. Jess, Vincent L. Knigge, Lee K. Kulle, William L. Rudzena, Nick Zissimopoulos
Estimating the term…
Valving configurations between the valve seat in a cassette and the valve members in a controller used to limit the flow rate of an intravenous solution to a patient. The configurations minimize the criticality of the alignment between the components. The cassette forms part of the flow path of the solution on its way to the recipient. The controller's valve member may stretch a membrane in the cassette and cause it to contact a flat surface surrounding the opening through which the fluid must flow. Alternately, the end of the valve member may be appreciably smaller than the opening, pass through it, and stretch the membrane until the latter contacts all of the opening's edge. The membrane meeting the edge of the opening in a closed loop prevents the flow of fluid through it. As a further possibility, the valve member may place the membrane in contact with one or more edges provided between two segments of a straight channel through which the solution flows.
In a device for controlling fluid flow through a flow path, a pair of alternatively operating, spaced valve means, controlling flow through said flow path, each valve means including a flow aperture defining an annular edge across which said flow path extends, a movable valve member comprising an elongated rod member, and a membrane positioned between said flow aperture and valve member, said valve member being adapted to move said membrane into and out of contact with said edge to respectively block and allow fluid flow through said flow path across said edge, the improvement comprising, in combination:
In a device for controlling fluid flow through a flow path, a valve means controlling flow through said flow path, each valve means including a flow aperture defining an annular edge across which a flow path extends, movable valve member means comprising an elongated rod member, and a membrane positioned between said flow aperture and valve member means, said valve member means being adapted to move said membrane into and out of contact with said annular edge to respectively block and allow fluid flow through the flow path across said annular edge, the improvement comprising, in combination:
Dependencies are inferred from the claim text.