Pumping cassette
First Claim
Patent Images
1. A pumping cassette comprising:
- a housing comprising at least one membrane pump for pumping liquid, the membrane pump comprising a pumping chamber and an actuation chamber that is separated from the pumping chamber by a flexible membrane, the pumping chamber comprising at least two flowpaths for the inflow or outflow of liquid;
a first liquid port on the housing, the first liquid port being in fluid communication via one or more pump valves in the housing with one or more ports of the pumping chamber; and
a venting port on the housing, the venting port being in fluid communication via a vent valve in the housing with a vent on the housing, whereinthe venting port, vent valve and vent are fluidically isolated from the first liquid port, the one or more pump valves, and the pumping chamber of the pump, and the first liquid port and the venting port are adapted to make separate fluid connections with a reservoir external to the pumping cassette, and whereinthe first liquid port is configured to receive liquid from the reservoir, and the venting port is configured to make a venting connection with the reservoir.
1 Assignment
0 Petitions
Accused Products
Abstract
A pumping cassette, the cassette includes a housing. The housing includes at least one fluid port and at least one air vent port. The air vent port vents a fluid source outside the housing. The pumping cassette also includes at least one reciprocating pressure displacement membrane pump within the housing. The pump pumps fluid.
-
Citations
18 Claims
-
1. A pumping cassette comprising:
-
a housing comprising at least one membrane pump for pumping liquid, the membrane pump comprising a pumping chamber and an actuation chamber that is separated from the pumping chamber by a flexible membrane, the pumping chamber comprising at least two flowpaths for the inflow or outflow of liquid; a first liquid port on the housing, the first liquid port being in fluid communication via one or more pump valves in the housing with one or more ports of the pumping chamber; and a venting port on the housing, the venting port being in fluid communication via a vent valve in the housing with a vent on the housing, wherein the venting port, vent valve and vent are fluidically isolated from the first liquid port, the one or more pump valves, and the pumping chamber of the pump, and the first liquid port and the venting port are adapted to make separate fluid connections with a reservoir external to the pumping cassette, and wherein the first liquid port is configured to receive liquid from the reservoir, and the venting port is configured to make a venting connection with the reservoir. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A system for transferring liquid to or from a reservoir, the system comprising:
-
a pumping cassette comprising at least one membrane pump for pumping liquid, the membrane pump comprising a pumping chamber and an actuation chamber that is separated from the pumping chamber by a flexible membrane, the pumping chamber comprising at least two flowpaths for the inflow or outflow of liquid;
a first liquid port on the cassette, the first liquid port being in fluid communication via one or more pump valves in the cassette with the one or more flowpaths of the pumping chamber; and
a first gas flow port on the cassette configured for the flow of a fluid comprising a gas through the first gas flow port, the first gas flow port being in fluid communication via a gas flow valve in the cassette with a second gas flow port on the cassette; anda controller for controlling the actuation of the at least one membrane pump and the valves, wherein the first and second gas flow ports and the gas flow valve are fluidically isolated from the first liquid port, the one or more pump valves and the pumping chamber of the pump so that a flowpath between the first gas flow port and the second gas flow port is separate from a flowpath associated with the first liquid port, and the controller is configured to control the inflow of liquid into the cassette via the first liquid port, and to control the flow of the fluid comprising a gas through the flowpath between the first gas flow port and the second gas flow port via the gas flow valve, wherein the controller is configured to control the flow of liquid from a reservoir external to the cassette into the pumping chamber of the at least one membrane pump via a fluid connection between the reservoir and the first liquid port, and the controller is configured to control venting of the reservoir via a separate fluid connection between the reservoir and at least one of the first and second gas flow ports. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
Specification