Importance

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Abstract

The present invention is directed to an improved cassette for use in an intravenous infusion pump. The cassette of the present invention includes a cassette body which is capable of being removably secured within a volumetric pump. The cassette body has a volumetric chamber of predetermined volume which is placed in communication with an inlet and an outlet. The volumetric cassette includes an inlet corridor through which fluid may flow into the cassette. The inlet corridor in turn flows into a central corridor which leads directly to the volumetric chamber. The cassette also includes an outlet corridor which is also in communication with the central corridor and, in turn, the volumetric chamber. Fluid will, therefore, exit the volumetric chamber through the outlet corridor by way of the central corridor. The outlet corridor is then connected to the patient infusion line. The cassette of the present invention also includes a plunger which reciprocates within the interior of the volumetric chamber. The present invention teaches the use of a diaphragm which covers the portion of the plunger which is exposed to the volumetric chamber. The diaphragm forms a friction seal with the exterior of the cassette body. The diaphragm is formed such that it reciprocates along with the plunger even though it is not securely attached to the plunger. As a result, when the plunger withdraws from the volumetric chamber, the diaphragm withdraws a corresponding distance. When the plunger again enters the volumetric chamber, the diaphragm enters as well.

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First Claim