A peritoneal dialysis (PD) system having an ultrafilter is disclosed herein. In one example, the PD system includes a housing and a PD fluid pump. The PD system also includes a filter comprising an outer chamber, a central portion, a membrane, an inlet connected to the outer chamber, an outlet, a first venting port connected to the outer chamber, and a second venting port connected to the central portion. The first venting port has a valve preventing air flow into the filter via the first venting port. The PD system further includes a pressure sensor and a control unit configured to control the PD fluid pump. The control unit is further configured to determine a pressure inside the filter based on an output from the pressure sensor and determine an integrity status of the membrane based on the pressure inside the filter.

A method is disclosed for evaluating a condition of an apparatus arranged to output a fluid through an outlet port and through at least one sterilizing grade filter of a line set fluidly connected to the outlet port. The method includes monitoring a flow rate correlated with a flow rate of the fluid flowing through the at least one sterilizing grade filter, monitoring a pressure correlated with a pressure of the fluid flowing to the at least one sterilizing grade filter, and evaluating a condition of the apparatus based on a relationship between the monitored flow rate and the monitored pressure.

A respiratory assistance apparatus is configured to provide a heated and humidified glow of gases and has a control system that is configured to detect a fault in the flow path. A flow path is provided for a gases stream through the apparatus from a gas inlet through a blower unit and humidification unit to a gases outlet. A flow rate sensor is provided in the flow path and is configured to sense the flow rate and generate an flow rate signal and/or a motor speed sensor is provided that is configured to sense the motor speed of the blower unit and generate an indicative motor speed signal.

A peritoneal dialysis (PD) system includes a housing; a PD fluid pump housed by the housing; a filter set including a filter housing and a hydrophilic filter membrane dividing an upstream chamber from a downstream chamber; a dual lumen patient line including a fresh PD fluid lumen in fluid communication with the upstream chamber and a used PD fluid lumen in fluid communication with the downstream chamber; a pressure sensor positioned and arranged to provide a pressure sensor output indicative of pressure in the downstream chamber of the filter housing; and a control unit configured to perform a pressure integrity test on the hydrophilic filter membrane by monitoring the pressure sensor output over a period of time, the pressure sensor output indicative of a negative pressure created in the downstream chamber by the PD fluid pump. A pressure drop test for evaluating the filter membrane is also disclosed.

A respiratory assistance apparatus is configured to provide a heated and humidified glow of gases and has a control system that is configured to detect a fault in the flow path. A flow path is provided for a gases stream through the apparatus from a gas inlet through a blower unit and humidification unit to a gases outlet. A flow rate sensor is provided in the flow path and is configured to sense the flow rate and generate an flow rate signal and/or a motor speed sensor is provided that is configured to sense the motor speed of the blower unit and generate an indicative motor speed signal.

The present disclosure relates to a process for testing the integrity of membranes in a filter module. Specifically, the process is applied to filters for extracorporeal blood treatment, in particular, filters comprising both filter membranes and particulate material.