Method for pumping fluid from a flexible, variable geometry rese

Details Method for pumping fluid from a flexible, variable geometry rese Method for pumping fluid from a flexible, variable geometry rese

1992-11-02

1993-08-03

Hirsch, Paul J.

Surgery

Means for introducing or removing material from body for...

Material introduced into and removed from body through...

128DIG12, 604 67, 604132, A61M 100

Patent

active

052324397

ABSTRACT:
A method of pumping fluid from an IV bag with a volumereducible chamber capable of holding the bag. The method includes the steps of placing the bag in the chamber and reducing the volume of the chamber according to calculations from known values in the controller memory to compensate for the nonlinear relationship between the reduction of bag volume corresponding to reduction in chamber volume. The next step is actuating the motor which controls the volume to reduce the volume of the chamber according to the calculations. A method of pumping from a flexible bag also is contemplated where the controller also or alternatively controls the rate of the reduction of the chamber rather than the volume.

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