Medical fluid delivery sets 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 an actuator; 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 defining a recess; and
a plunger slidably disposed within the recess of the base, the plunger comprising a rotatable member and a seal connected to the rotatable member in a manner such that rotation of the rotatable member causes axial movement of the rotatable member and the seal relative to the base, the seal being configured to cooperate with the base such that a substantially liquid-tight seal is maintained between the plunger and the base as the plunger slides axially within the recess, the rotatable member, the seal, and the base cooperating to at least partially define a fluid pump chamber,wherein, when the medical fluid cassette is disposed within the cassette enclosure of the medical fluid pumping machine, the actuator can be operated to axially displace the plunger within the recessed region of the base to force fluid out of the fluid pump chamber and to draw fluid into the fluid pump chamber.
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Abstract
This disclosure relates to medical fluid delivery sets and related systems and methods. In some aspects of the invention, a medical fluid cassette includes a plunger slidably disposed within a recess of a base of the cassette such that a substantially liquid-tight seal is maintained between the plunger and the base as the plunger slides axially within the recess. The plunger and the base cooperate to at least partially define a fluid pump chamber. When the plunger is displaced in a first direction, fluid is forced out of the fluid pump chamber, and when the plunger is displaced in a second direction, fluid is drawn into the fluid pump chamber.
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Citations
27 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 an actuator; 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 defining a recess; and a plunger slidably disposed within the recess of the base, the plunger comprising a rotatable member and a seal connected to the rotatable member in a manner such that rotation of the rotatable member causes axial movement of the rotatable member and the seal relative to the base, the seal being configured to cooperate with the base such that a substantially liquid-tight seal is maintained between the plunger and the base as the plunger slides axially within the recess, the rotatable member, the seal, and the base cooperating to at least partially define a fluid pump chamber, wherein, when the medical fluid cassette is disposed within the cassette enclosure of the medical fluid pumping machine, the actuator can be operated to axially displace the plunger within the recessed region of the base to force fluid out of the fluid pump chamber and to draw fluid into the fluid pump chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20)
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15. A medical fluid cassette, comprising:
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a base defining a recess; a membrane attached to the base to form fluid passageways between the membrane and the base; and a plunger slidably disposed within the recess of the base, the plunger comprising a rotatable member and a seal connected to the rotatable member in a manner such that rotation of the rotatable member causes axial movement of the rotatable member and the seal relative to the base, the seal being configured to cooperate with the base such that a substantially liquid-tight seal is maintained between the plunger and the base as the plunger slides axially within the recess, the rotatable member, the seal, and the base cooperating to at least partially define a fluid pump chamber, wherein, when the plunger is displaced in a first direction, fluid is forced out of the fluid pump chamber, and when the plunger is displaced in a second direction, fluid is drawn into the fluid pump chamber. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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Specification