Hemodialysis system

A blood circuit assembly and drain cassette for a dialysis unit, the blood circuit assembly comprising:

• a pair of pneumatic pumps for circulating blood received from a patient through a circuit including a dialyzer unit and returned to the patient, the pneumatic pumps having pneumatic control ports arranged for alignment and mating with corresponding ports located on an exposed panel of the dialysis unit by pushing the control ports into engagement with the corresponding ports with mounting of the blood circuit assembly to the exposed panel;
• an air trap arranged to remove air from blood circulating in the circuit;
• a pair of dialyzer connections arranged to connect to the inlet and outlet of a dialyzer unit;
• and
• a pair of blood line connectors, including an arterial blood line connector for receiving blood from the patient and providing blood to the pneumatic pumps and a venous blood line connector for returning blood to the patient;
• the drain cassette comprising:
• a venous connection port for connection to, and fluid communication with, the venous blood line connector;
• an arterial connection port for connection to, and fluid communication with, the arterial blood line connector;
• a fluid channel fluidly connecting the venous connection port and the arterial connection port;
• a drain outlet port in fluid communication with the fluid channel and arranged to removably couple with a drain connector on an exposed panel of the dialysis unit;
• and
• a valve arranged to control flow in the fluid channel,
• wherein both the blood circuit assembly and the drain cassette are engageable with the exposed panel for operation in a dialysis treatment, and are removable from the exposed panel for replacement, without the use of tools.

A blood circuit assembly for a dialysis unit, comprising:

• a pair of pneumatic pumps for circulating blood received from a patient through a circuit including a dialyzer unit and returning the blood to the patient, the pneumatic pumps having pneumatic control ports arranged for alignment and mating with corresponding ports located on an exposed panel of the dialysis unit by pushing the control ports into engagement with the corresponding ports with mounting of the blood circuit assembly to the exposed panel;
• an air trap arranged to remove air from blood circulating in the circuit;
• a pair of dialyzer connections arranged to connect to the inlet and outlet of a dialyzer unit;
• a pair of blood line connectors, including an arterial blood line connector for receiving blood from the patient and providing blood to the pneumatic pumps and a venous blood line connector for returning blood to the patient;
• and
• flexible tubing fluidly connecting the pumps, the air trap, the dialyzer connections and the blood line connectors;
• wherein the pumps are defined, at least in part, by a single unitary member that additionally defines a plurality of routing channels for at least a portion of the flexible tubing.

A blood circuit assembly and drain cassette for a dialysis unit, the blood circuit assembly comprising:

• an organizing tray;
• a pair of pneumatic pumps attached to the organizing tray for circulating blood received from a patient through a circuit including a dialyzer unit and returning the blood to the patient;
• an air trap attached to the organizing tray arranged to remove air from blood circulating in the circuit;
• a pair of dialyzer connections fluidly connected to the air trap and the pumps and arranged to connect to the inlet and outlet of a dialyzer unit;
• a pair of blood line connectors fluidly connected to the pumps and the air trap, including an arterial blood line connector for receiving blood from the patient and providing blood to the pneumatic pumps and a venous blood line connector for returning blood to the patient;
• and
• flexible tubing fluidly connecting the pumps, the air trap, the dialyzer connections and the blood line connectors;
• wherein the organizing tray engages with at least a portion of the flexible tubing to position the flexible tubing for mounting at an occluder position for interaction with an occluder of the dialysis unit, and wherein the organizing tray supports the air trap at a location that is above the occluder position.

A blood circuit assembly engagement device for a dialysis unit, comprising:

• an actuator movably mounted to a panel of the dialysis unit adjacent a plurality of control ports, the actuator movable between a retention position and an ejection position;
• a retainer element coupled to the actuator and arranged, with the actuator in the retention position, to retain a blood circuit assembly mounted to the panel of the dialysis unit on the panel, and arranged, with the actuator in the ejection position, to release the blood circuit assembly for removal from the panel of the dialysis unit;
• and
• an ejector element coupled to the actuator and arranged, with the actuator moved from the retention position to the ejection position, to urge the blood circuit assembly away from the panel.

An occlusion assembly for occluding at least one pair of collapsible tubes of a medical infusion device, comprising:

• for each pair of collapsible tubes, a first occluding member and a second occluding member, the first occluding member positioned adjacent to a first collapsible tube of the pair and the second occluding member positioned adjacent to a second collapsible tube of the pair, when the tubes are installed in the occlusion assembly for operation, the first occluding member and the second occluding member being further positioned adjacent from each other such that a space is defined between the first occluding member and the second occluding member, the space being on an opposite side of each occluding member than is the collapsible tube to which it is adjacent;
• a spreader positioned within the space and movable within the space from a first position to a second position, wherein movement from the first position to the second position causes the spreader to force at least a portion of the first and second occluding members to move apart from each other to increase the size of the space and force a tube-contacting portion of each occluding member against the collapsible tube to which it is adjacent to occlude the collapsible tube;
• and
• at least one actuator constructed and positioned to move the spreader between the first position and the second position.

An occlusion assembly for occluding at least one collapsible tube of a medical infusion device, comprising:

• a frame comprising a tubing guide configured for positioning the collapsible tube;
• a tubing occluder mounted to the frame and comprising an occluding member constructed and positioned to controllably occlude or release occlusion of the collapsible tube;
• a door hingeably mounted to the frame and positioned to cover at least a portion of the collapsible tube and tubing occlude when in a closed position and to provide user access to the collapsible tube when in an open position;
• and
• a switch configured and positioned to detect when the door is in a closed position and to permit operation of the tubing occluder to release occlusion of the collapsible tube only when the door is in the closed position.

An occlusion assembly for occluding at least one collapsible tube of a medical infusion device, comprising:

• a tubing occluder comprising an occluding member constructed and positioned to controllably occlude or release occlusion of the collapsible tube;
• an automatic actuator operatively coupled to the tubing occluder to cause essentially linear motion of at least a portion of the tubing occluder to cause the occluding member to move from an occluding position to a non-occluding position;
• and
• an override mechanism operatively coupled to the tubing occluder to cause essentially linear motion of at least a portion of the tubing occluder to cause the occluding member to move from an occluding position to a non-occluding position upon manual operation of the override mechanism by a user.

An occlusion assembly for occluding at least one collapsible tube of a medical infusion device, comprising:

• a frame comprising a tubing guide configured for positioning the collapsible tube;
• a tubing occluder mounted to the frame and comprising an occluding member constructed and positioned to controllably occlude or release occlusion of the collapsible tube;
• a door hingeably mounted to the frame and positioned to cover at least a portion of the collapsible tube and tubing occluder when in a closed position and to provide user access to the collapsible tube when in an open position;
• and
• a retainer mechanism engaged by the door when the door is in the closed position and configured to permit operation of the tubing occluder to occlude or release occlusion of the collapsible tube when the door is in the closed position and configured to engage and retain the tubing occluder in a non-occluding configuration when the door is opened while the tubing occluder is positioned in the non-occluding configuration.