Fluid pumping apparatus for use with a removable fluid pumping cartridge
First Claim
1. An apparatus for pumping fluid comprising:
- a housing enclosing a pump drive assembly for actuating at least one pump on a removable fluid pumping cassette, when the pumping cassette is installed in the housing;
a door connected to the housing for enclosing the installed cassette in the housing upon closure of the door;
the pump drive assembly comprising a mating block configured for operative association with the installed cassette;
the mating block configured to permit a sealing engagement with the installed cassette upon closure of the door;
whereinthe door includes a movable compression plate configured to move toward the cassette and exert a compressive force on the installed cassette against the mating block when the door is in a closed position; and
whereinthe door further comprises an expandable bladder adjacent the compression plate and configured to be pressurized against the compression plate to generate a compressive force on the installed cassette; and
further comprisinga controller configured to control expansion of the bladder and to receive a signal from one or more sensors to detect whether the door is in a closed position.
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Accused Products
Abstract
The present invention involves, in some embodiments apparatus, such as dialysis apparatus, and methods for pumping fluid. Certain embodiments comprise a housing enclosing a pump drive assembly for actuating at least one pump on a removable fluid pumping cassette. The housing may comprise a door connected to the housing for enclosing an installed cassette in the housing upon closure of the door. The pump drive assembly may comprise a mating block configured for operative association with an installed cassette and to may be configured to permit a sealing engagement with an installed cassette upon closure of the door. To facilitate sealing, certain embodiments of the door include a movable compression plate configured to exert a compressive force on an installed cassette against the mating block when the door is in a closed position.
157 Citations
24 Claims
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1. An apparatus for pumping fluid comprising:
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a housing enclosing a pump drive assembly for actuating at least one pump on a removable fluid pumping cassette, when the pumping cassette is installed in the housing; a door connected to the housing for enclosing the installed cassette in the housing upon closure of the door; the pump drive assembly comprising a mating block configured for operative association with the installed cassette; the mating block configured to permit a sealing engagement with the installed cassette upon closure of the door;
whereinthe door includes a movable compression plate configured to move toward the cassette and exert a compressive force on the installed cassette against the mating block when the door is in a closed position; and
whereinthe door further comprises an expandable bladder adjacent the compression plate and configured to be pressurized against the compression plate to generate a compressive force on the installed cassette; and
further comprisinga controller configured to control expansion of the bladder and to receive a signal from one or more sensors to detect whether the door is in a closed position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A dialysis apparatus comprising:
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a base unit configured to receive and control a removable fluid handling cassette; a stationary mating surface on the base unit configured for operative association with the cassette when installed in the base unit; and a door connected to the base unit for enclosing the cassette upon closure of the door; wherein the door includes a compression plate configured to move toward the cassette and exert a compressive force on the installed cassette against the mating surface when the door is in a closed position; and
whereinthe door further comprises an expandable bladder adjacent the compression plate and configured to be pressurized against the compression plate to generate a compressive force on the installed cassette; and
further comprisinga controller configured to control expansion of the bladder, and configured to receive a signal from one or more sensors to detect whether the door is in a closed position, and whether the cassette is installed in the base unit. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification