Carefusion 303, Inc.

Lun Zhang

Frank Cai

Derek Alan Carroll

Siddarth K Shevgoor

Peristaltic pumps are described herein. In certain embodiments, a peristaltic pump includes a plunger, a first biasing member, and a second biasing member. The plunger is movable to selectively engage a pumping volume of a tubing segment to expand the pumping volume to draw fluid flow into the pumping volume and to contract the pumping volume to conduct fluid flow from the pumping volume. The first biasing member is configured to urge the plunger toward the tubing segment to maintain contact with the tubing segment during the expansion of the pumping volume. The second biasing member is configured to urge the plunger toward the tubing segment to contract the pumping volume.

Peristaltic pump with constant biasing force

Peristaltic pumps are described herein. In certain embodiments, a peristaltic pump includes a plunger, a camshaft, and a first biasing member. The plunger is movable to selectively engage a pumping volume of a tubing segment. The camshaft includes a first plunger cam lobe. The first plunger cam lobe is configured to move the plunger between an engaged position in contact with the pumping volume and a disengaged position spaced apart from the pumping volume. The first biasing member is configured to urge the plunger toward the tubing segment to maintain contact with the tubing segment in the engaged position.

Peristaltic pump with camshaft and reduced spring force arrangement

Peristaltic pumps are described herein. In certain embodiments, a peristaltic pump includes a plunger and a feeler pin. The plunger is movable to selectively engage a pumping volume of a tubing segment to expand the pumping volume to draw fluid flow into the pumping volume and to contract the pumping volume to conduct fluid flow from the pumping volume. The feeler pin extends through the plunger and movable to maintain contact with the tubing segment, wherein the feeler pin is movable in response to a height of the pumping volume.

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Brea, CA, United States of America

Lun Zhang