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Intravenous liquid pumping system and method

  • US 4,468,222 A
  • Filed: 12/03/1979
  • Issued: 08/28/1984
  • Est. Priority Date: 05/24/1976
  • Status: Expired due to Term
First Claim
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1. In an intravenous liquid pumping system for use with a source of intravenous liquid to be supplied to a patient, a controller, a disposable pump for use with the controller and normally disposed of after a one-time use and clamping means for securing said disposable pump to the controller for easy insertion and removal of the disposable pump, the controller having a controller body forming a chamber with first and second openings in communication therewith, a plunger mounted in said first opening for movement into and out of the chamber between innermost and outermost positions, a flexible membrane carried solely by the controller body to seal said chamber so it is liquid tight, a constant quantity of liquid filling said sealed chamber whereby as said plunger is moved into and out of the liquid the membrane will be moved between extended and retracted positions and motive means for moving said plunger, said disposable pump having a rigid pump body with a pump chamber therein, said pump body having an opening therein in communication with said pump chamber, a flexible membrane carried solely by said pump body, and covering said opening in said pump body, said membrane carried by the pump body being exposed to the atmosphere when it is free of the controller, said pump body having outlet and inlet ports formed therein in communication with the pump chamber, outlet valve means for controlling liquid flow from the pump chamber through the outlet port, inlet valve means for controlling liquid flow into the pump chamber through the inlet port, each valve means including a valve seat and a valve member movable either to an inoperative position spaced from the seat or an operative position in cooperative relationship with the seat, means for biasing each of said valve members to its operative position when the pump is secured to the controller by the clamping means, means adapted to connect the inlet port to the source of liquid and means adapted to connect the outlet port to the patient, said clamping means for securing the disposable pump to the controller including means for positioning the pump so that the flexible membrane carried thereby is in intimate contact with the flexible membrane of the sealed chamber of the controller whereby as the plunger is moved, intravenous liquid is forced through said pump by conjoint movement of said membranes.

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