Pumps – Successive stages
Patent
1998-06-29
2000-11-14
Thorpe, Timothy S.
Pumps
Successive stages
417478, 417479, F04B 2500, F04B 4312
Patent
active
061461091
ABSTRACT:
An infusion device with a disposable administration set which is inexpensive to manufacture. In the preferred embodiment of the present invention the disposable administration set has a plurality of elongated cam followers connected to a plate assembly, wherein the cam followers are displaced in a predetermined sequence and forced against a delivery tube by cam means driven by rotary drive means. The disposable administration set is injection molded as a single integral piece. The disposable administration set includes adjustment spacers disposed between the plate assembly and the cam followers which adjust the distance between them to keep the device accurate. In the preferred embodiment of the present invention the cam assembly is configured to provide fluid delivery at a consistent and uniform rate. The device may also incude a pressure sensing pin positioned on the cam assembly which contacts the tubing during the pumping cycle. The drive current is sampled and processed at predetermined phases during the cam rotation cycle to detect the presence of an occlusion in the tubing.
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Davis David L.
Hatch Richard F.
Poirier David A.
Alaris Medical Systems, Inc.
Thorpe Timothy S.
Tyler Cheryl J.
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