Pumps – Condition responsive control of pump drive motor – By stopping pump in response to leakage into or from system
Patent
1987-04-10
1989-06-20
Smith, Leonard E.
Pumps
Condition responsive control of pump drive motor
By stopping pump in response to leakage into or from system
417 28, 417479, F04B 4308, A61M 100
Patent
active
048405426
ABSTRACT:
An infusion pump incorporates a cassette formed by bonding of two substantially flat sheets. The fluid to be infused to the patient comes into contact only with the cassette. The cassette includes first and second flexible sheets which define a pumping chamber therebetween. The infusion pump is provided with a pumping member having a hub and a plurality of petal-shaped sections extending radially outward therefrom and pivotal relative thereto. A stepping motor can be operated to move the pumping member against the second flexible sheet to decrease the volume of the pumping chamber and pump fluid to the patient. A load cell monitors the force exerted by the stepping motor on the hub. An outlet restriction value is electronically controlled by a second stepping motor in response to the pressure sensed by the load cell to control pumping to a predetermined pressure. The pressure can be selectively varied which permits the use of a low pressure at low flow rates to decrease the time necessary to detect an occlusion in the output lines.
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Quest Medical Inc.
Smith Leonard E.
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