Pumping systems for cassette-based dialysis
DCFirst Claim
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1. A peritoneal dialysis system comprising:
- a peritoneal dialysis machine including a vacuum source pneumatically connected to a vacuum chamber constructed and arranged to hold a vacuum, the peritoneal dialysis machine further including a stepper motor, and a piston having a piston head, at least a portion of the piston head moveable within the vacuum chamber;
a pumping cassette including a rigid portion defining a pump well and a flexible membrane covering the pump well; and
wherein the peritoneal dialysis machine is configured to be mated with the pumping cassette so as to apply the vacuum to a portion of the flexible membrane corresponding to the vacuum chamber, the flexible membrane following the piston head as the piston head is retracted from the pump well of the rigid portion, the piston head operable to cause the flexible membrane to move at least partially into the pump well as the piston head is moved at least partially into the pump well.
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Abstract
A peritoneal dialysis system includes a dialysis machine including a pump chamber and a pump actuator moveable within the pump chamber; a pumping cassette including a rigid portion defining a pump well and a flexible membrane covering the pump well; and wherein the dialysis machine is configured to be mated with the pumping cassette so as to hold a vacuum between the pump chamber and the flexible membrane, the vacuum operable to cause the flexible membrane to follow the pump actuator as the actuator is retracted from the pump well of the rigid portion, the pump actuator operable to cause the flexible membrane to move into the pump well as the actuator is moved into the pump well.
777 Citations
22 Claims
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1. A peritoneal dialysis system comprising:
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a peritoneal dialysis machine including a vacuum source pneumatically connected to a vacuum chamber constructed and arranged to hold a vacuum, the peritoneal dialysis machine further including a stepper motor, and a piston having a piston head, at least a portion of the piston head moveable within the vacuum chamber; a pumping cassette including a rigid portion defining a pump well and a flexible membrane covering the pump well; and wherein the peritoneal dialysis machine is configured to be mated with the pumping cassette so as to apply the vacuum to a portion of the flexible membrane corresponding to the vacuum chamber, the flexible membrane following the piston head as the piston head is retracted from the pump well of the rigid portion, the piston head operable to cause the flexible membrane to move at least partially into the pump well as the piston head is moved at least partially into the pump well. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A peritoneal dialysis system comprising:
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a peritoneal dialysis machine including a vacuum source and first and second vacuum chambers constructed and arranged to hold a vacuum, the first and second vacuum chambers pneumatically connected to the vacuum source, the peritoneal dialysis machine further including first and second pistons driven by first and second stepper motors, respectively, each piston having a piston head moveable within the first and second vacuum chambers, respectively; a pumping cassette including a rigid portion defining first and second pump wells and a flexible membrane covering the pump wells; and the peritoneal dialysis machine configured to be mated with the pumping cassette so as to apply the vacuum to a portion of the flexible membrane corresponding to the first vacuum chamber and to a portion of the flexible membrane corresponding to the second vacuum chamber, the vacuum operable to cause the flexible membrane to follow the first and second piston heads as either piston head is moved by its respective first or second stepper motor in a first direction to fill the respective pump well, the first and second piston heads operable to cause the flexible membrane to move at least partially into the first and second pump wells, respectively, of the rigid portion as the respective piston head is moved in a second direction to empty the respective pump well. - View Dependent Claims (11, 12, 13, 14)
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15. A peritoneal dialysis system comprising:
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a peritoneal dialysis machine including a vacuum source and a vacuum chamber pneumatically connected to the vacuum source; a pumping cassette including a rigid portion forming a pump well and a flexible membrane covering the pump well, the peritoneal dialysis machine configured such that the vacuum chamber and the pump well are mated when the disposable cassette is loaded into the dialysis machine; a piston operatively coupled to a stepper motor and having a piston shaft and a piston head, the piston head configured to move the flexible membrane into the pump well of the pumping cassette; and wherein the vacuum chamber is constructed and arranged to hold a vacuum and the vacuum chamber includes at least one wall constructed and arranged to accommodate at least a portion of the piston head such that the vacuum formed in the vacuum chamber pneumatically pulls the flexible membrane to the piston head. - View Dependent Claims (21)
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16. A peritoneal dialysis system comprising:
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a peritoneal dialysis machine including a vacuum source and a vacuum chamber pneumatically connected to the vacuum source, a piston having a piston head, and a stepper motor; a disposable cassette including a hard side, part of which forms a pump well, and a soft side, part of which corresponds to the pump well, the pump well configured to receive at least a portion of the piston head; and the vacuum chamber constructed and arranged to (i) accommodate at least a portion of the piston head and (ii) contain a vacuum to pull the soft side of the disposable cassette to the piston head to at least partially mate the soft side of the disposable cassette with the piston head, wherein the peritoneal dialysis machine is configured to push a dialysis fluid from the pump well as the piston head and soft side of the disposable cassette extend at least partially into the pump well, and draw dialysis fluid into the pump well as the piston head retracts from the pump well and the vacuum holds the soft side of the disposable cassette in at least partial contact with the piston head. - View Dependent Claims (17, 18, 19, 20, 22)
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Specification