A system and method for balancing flows of renal replacement fluid is disclosed. The method uses pressure controls and pressure sensing devices to more precisely meter and balance the flow of fresh dialysate and spent dialysate. The balancing system may use one or two balancing devices, such as a balance tube, a tortuous path, or a balance chamber.

A fluid treatment plant has a filter module including at least a first filter and a second filter connected in series and connectable to a supply of fluid. A pump is fluidly connected to the filter module and a controller with a fluid quality sensor is connected to detect a quality of the fluid between the first filter and the second filter. A filter module detector is connected to the controller configured to uniquely detect a filter module connected to the pump, and the controller is controls the pump responsively to a signal from the fluid quality sensor and the module detector. The controller is configured to continue pumping based on output of the quality sensor and/or based on output from the filter module detector.

A manifold assembly for a peritoneal dialysis apparatus, comprises: a casing delimiting internally a first compartment and a second compartment; a yielding pump tube having a first end connected or connectable to the first compartment and a second end connected or connectable to the second compartment. The yielding pump tube extends outside the casing to be coupled to a peristaltic pump of a cycler of a peritoneal dialysis apparatus. A first pump port and a second pump port are placed on a first side of the casing and ports are placed on a second side of the casing, opposite the first side.

A manifold assembly for a peritoneal dialysis apparatus, comprises: a casing delimiting internally a first compartment and a second compartment; a yielding pump tube having a first end connected or connectable to the first compartment and a second end connected or connectable to the second compartment. The yielding pump tubes extends outside the casing to be coupled to a peristaltic pump of a cycler of a peritoneal dialysis apparatus. The second compartment delimits expansion chambers configured to attenuate pressure pulsations from the peristaltic pump.

A method for calibrating a peristaltic pump in a medical apparatus comprises: rotating the peristaltic pump of a predetermined rotation to pump a liquid from a fluid source from a first compartment into a second compartment of a manifold assembly, raising a level of the liquid in the second compartment and compressing air in an air buffer volume of the manifold assembly; measuring a pressure of air in the air buffer volume; calculating, from the measured pressure, a variation of liquid volume in the second compartment due to the rotation of the peristaltic pump; calculating, from the variation of liquid volume and the predetermined rotation, a stroke liquid volume of the peristaltic pump.

The invention relates to a method and to an apparatus for the automatic, weight-dependent filling of a hose system, in particular for a gravimetric cycler for peritoneal dialysis, having only one scale, wherein the hose system comprises at least three line sections for connection to at least one drainage bag, to at least one solution bag and to a patient.

A medical treatment system, such as peritoneal dialysis system, may include control and other features to enhance patient comfort and ease of use. For example, a peritoneal dialysis system may include patient line state detector for detecting whether a patient line is primed before it is to be connected to the patient. The patient line state detector can also the ability to detect whether a patient line has been properly mounted for priming. Both patient line presence/absence and fill state can be determined using an optical system, e.g., one that employs a single optical sensor.

A medical fluid delivery system includes a source of purified water; a source of concentrate for mixing with water from the water source; a disposable set including a pumping portion, a water line in fluid communication with the source of purified water and the pumping portion, the water line including a filter for filtering the water, a concentrate line in fluid communication with the concentrate source and the pumping portion, and a heater/mixing container in fluid communication with the pumping portion; a medical fluid delivery machine including, a pump actuator operable with the pumping portion of the disposable set, and a heater/mixing pan configured to support the heater/mixing container; and at least one leveling foot positioned and arranged to enable the heater/mixing pan to be oriented in a desired position for mixing the concentrate and purified water. A leveling tray and leveling foot are provided additionally.

A system for dialysis is disclosed. An example peritoneal dialysis system includes a peritoneal dialysis machine including a pumping mechanism, and a sensor configured to measure a property of peritoneal dialysis fluid. The peritoneal dialysis system also includes a disposable cassette operable with the peritoneal dialysis machine. The disposable cassette includes a fluid source inlet for accepting fluid from a fluid source and a fluid flow path in fluid communication with the fluid source inlet. The fluid flow path includes a pump chamber operable with the pumping mechanism to pump fluid through the fluid flow path. The disposable cassette also includes a concentrate inlet for fluidly communicating concentrate to the fluid flow path, and a sensor chamber located along the fluid flow path and operable with the sensor. The sensor is configured to provide feedback to the peritoneal dialysis machine for mixing the concentrate for forming peritoneal dialysis fluid.

A fluid handling cassette, such as that useable with an automated peritoneal dialysis (APD) cycler device or other infusion apparatus, may include a generally planar body having at least one pump chamber formed as a depression in a first side of the body and a plurality of flowpaths for a fluid that includes a channel. A patient line port may be arranged for connection to a patient line and be in fluid communication with the at least one pump chamber via at least a first one of said flowpaths, and an optional membrane may be attached to the first side of the body over the at least one pump chamber. In one embodiment, the membrane may have a pump chamber portion with an unstressed shape that generally conforms to the depression of the at least one pump chamber in the body and is arranged to be movable for movement of the fluid in a useable space of the at least one pump chamber. One or more spacers may be provided in the at least one pump chamber to prevent the membrane from contacting an inner wall of the at least one pump chamber. The patient line, a drain line, and/or a heater bag line may be positioned to be separately occludable in relation to one or more solution lines that are connectable to the cassette.