Blood treatment systems and methods
Dialysis systems comprising actuators that cooperate to perform dialysis functions and sensors that cooperate to monitor dialysis functions are disclosed. According to one aspect, such a hemodialysis system comprises a user interface model layer, a therapy layer, below the user interface model layer, and a machine layer below the therapy layer. The user interface model layer is configured to manage the state of a graphical user interface and receive inputs from a graphical user interface. The therapy layer is configured to run state machines that generate therapy commands based at least in part on the inputs from the graphical user interface. The machine layer is configured to provide commands for the actuators based on the therapy commands.
1. A system for delivering an anticoagulant solution in a blood circuit of a hemodialysis apparatus comprising:
a blood pump cassette comprising an anticoagulant metering pump, first and second diaphragm pumps, and a plurality of valves, the blood pump cassette configured for pumping blood from a cassette inlet connected to an arterial line to a cassette outlet connected to a venous line;
a controller configured to control the metering pump, the first diaphragm pump and the plurality of valves to pump a bolus of the anticoagulant solution from a container connected to the blood pump cassette to a pumping chamber of the first diaphragm pump;
the controller configured to control the first diaphragm pump to draw a first volume of dialysate solution into the pumping chamber before delivering the bolus of the anticoagulant solution and the first volume of dialysate solution to the blood pump cassette inlet or outlet; and
the controller configured to control the first diaphragm pump to draw a second volume of dialysate solution into the pumping chamber after delivering the bolus of anticoagulant solution and the first volume of dialysate solution, and to deliver the second volume of dialysate solution to the blood pump cassette inlet or outlet.
2. The system of claim 1 , wherein the controller is configured to control the first diaphragm pump and the plurality of valves to deliver the bolus of the anticoagulant solution and the first volume of dialysate solution to the blood pump cassette inlet.
3. The system of claim 2 , further comprising a detector associated with the arterial line to detect a presence of air in the arterial line, wherein the controller is configured to receive a signal from the detector, and upon detecting air the controller is configured to control the first diaphragm pump and the plurality of valves to deliver the bolus of the anticoagulant solution and the first volume of dialysate solution to the blood pump cassette outlet.
4. The system of claim 1 , wherein the controller is configured to control the first diaphragm pump and the plurality of valves to deliver the bolus of the anticoagulant solution and the first and second volumes of dialysate solution to the blood pump cassette inlet.
5. The system of claim 4 , further comprising a detector associated with the arterial line to detect a presence of air in the arterial line, wherein the controller is configured to receive a signal from the detector, and upon detecting air the controller is configured to control the first diaphragm pump and the plurality of valves to deliver the bolus of the anticoagulant solution and the first and second volumes of dialysate solution to the blood pump cassette outlet.
6. The system of claim 1 , wherein the controller is configured to control the anticoagulant metering pump to deliver air into the container after withdrawing the bolus of anticoagulant solution from the container.
7. The system of claim 6 , wherein the controller is configured to control the anticoagulant metering pump to deliver air into the container alternately with delivery of further boluses of anticoagulant solution from the container.
8. The system of claim 6 , wherein the container is mounted to a container attachment comprising a hollow spike for penetrating the container, the container attachment being attached to a top plate of the blood pump cassette, wherein the hollow spike is in a valved fluid connection to the metering pump, and wherein the top plate of the blood pump cassette comprises an air vent in valved fluid connection to the metering pump, and wherein the controller is configured to control the metering pump and the plurality of valves to pump a volume of air from the air vent to the container after the metering pump delivers the bolus of anticoagulant from the container.
9. The system of claim 1 , wherein the container is mounted to a container attachment comprising a hollow spike for penetrating the container, the container attachment being attached to a top plate of the blood pump cassette, wherein the hollow spike is in a valved fluid connection to the metering pump.
10. The system of claim 1 , wherein a top plate of the blood pump cassette comprises an air vent in valved fluid connection to the metering pump.