Medical fluid cassettes and related systems and methods
First Claim
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1. A medical fluid pumping system, comprising:
- a medical fluid pumping machine defining a cassette enclosure, the medical fluid pumping machine comprising a movable piston; and
a medical fluid cassette configured to be disposed within the cassette enclosure of the medical fluid pumping machine, the medical fluid cassette comprisinga base having a first region and a second region;
a first membrane overlying the first region of the base on a first side of the base, the first membrane cooperating with the first region of the base to form at least one fluid pathway; and
a second membrane overlying the second region of the base on the first side of the base, the second membrane cooperating with the second region of the base to define a fluid pump chamber, the second membrane being more resilient than the first membrane, and the cassette being positionable within the cassette enclosure of the medical fluid pumping machine so that the second membrane can be moved toward the base by the piston to decrease a volume of the fluid pump chamber and, upon retraction of the piston, the second membrane can rebound to increase the volume of the pump chamber.
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Abstract
This disclosure relates to medical fluid cassettes and related systems and methods. In certain aspects, a medical fluid cassette includes a base having a first region and a second region, a first membrane overlying the first region of the base, and a second membrane overlying the second region of the base. The second membrane is configured to rebound away from the base when a force used to press the second membrane toward the base is released.
521 Citations
23 Claims
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1. A medical fluid pumping system, comprising:
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a medical fluid pumping machine defining a cassette enclosure, the medical fluid pumping machine comprising a movable piston; and a medical fluid cassette configured to be disposed within the cassette enclosure of the medical fluid pumping machine, the medical fluid cassette comprising a base having a first region and a second region; a first membrane overlying the first region of the base on a first side of the base, the first membrane cooperating with the first region of the base to form at least one fluid pathway; and a second membrane overlying the second region of the base on the first side of the base, the second membrane cooperating with the second region of the base to define a fluid pump chamber, the second membrane being more resilient than the first membrane, and the cassette being positionable within the cassette enclosure of the medical fluid pumping machine so that the second membrane can be moved toward the base by the piston to decrease a volume of the fluid pump chamber and, upon retraction of the piston, the second membrane can rebound to increase the volume of the pump chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification