A - Human Necessities – 61 – M
Patent
A - Human Necessities
61
M
128/91
A61M 5/14 (2006.01) A61M 5/142 (2006.01) F04B 43/00 (2006.01) F04B 43/08 (2006.01)
Patent
CA 1148824
MEDICAL INFUSION SYSTEM AND METHOD OF OPERATION ABSTRACT A medical infusion system is described emploting a pump and cassette combination for conducting fluid or semi-solids from an upstream portion to a downstream portion of the system. The cassette includes a rigid enclosure defining a pumping cavity and has a window with a diaphragm spanning the window. The diaphragm is engaged by an actuator on the pump for varying the volume of the pumping cavity, Restrictors at the upstream and downstrem portions close off and open, respectively, the flow into and out of the pumping cavity in a sequence related to the actuator movement such that the pumping cavity alternately is filled and substantially emptied. To minimize the detrimental effects of air in the pumping cavity: 1) the actuator is operated to substantially increase the volume of the pumping cavity prior to opening of the upstream portion; and 2) the actuator is operated to reduce the volume of the pumping cavity to a residual volume of less than about 0.07 ml subsequent to closing of the upstream portion and opening of the downstream portion.
371814
Chen Herbert
Jassawalla Jal S.
Andros Incorporated
Macrae & Co.
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