Peritoneal dialysis system including manifold assembly and peristaltic pump

A peritoneal dialysis (“PD”) system comprising:

• a cycler including
• an actuation surface having a peristaltic pump actuator, and
• at least one pair of capacitive sensing plates;
• a manifold assembly including
• a rigid manifold having at least one chamber, the rigid manifold configured and arranged to be abutted against the actuation surface for operation, wherein the at least one pair of capacitive sensing plates is positioned to be operable with the at least one chamber of the rigid manifold, and
• a peristaltic pump tube including first and second ends in fluid communication with the rigid manifold;
• and
• a control unit configured to (i) cause the peristaltic pump actuator to actuate the peristaltic pump tube to pump an amount of dialysis fluid to one of the at least one chamber, (ii) receive a signal from the pair of capacitive sensing plates associated with the chamber, the signal indicative of the amount of dialysis fluid pumped, (iii) count a number of revolutions of the peristaltic pump actuator needed to pump the amount of dialysis fluid to the chamber, (iv) determine a current volume per revolution for the peristaltic pump actuator, and (v) use the current volume per revolution for at least one subsequent operation of the peristaltic pump actuator.

A peritoneal dialysis (“PD”) system comprising:

• a cycler including
• an actuation surface having a peristaltic pump actuator, and
• a pair of capacitive sensing plates;
• a manifold assembly including
• a rigid manifold having first, second and third chambers, the rigid manifold configured and arranged to be abutted against the actuation surface for operation, wherein the pair of capacitive sensing plates is positioned to be operable with the first chamber, and
• a peristaltic pump tube extending from the first chamber to the second chamber of the rigid manifold;
• and
• a control unit configured to (i) cause the peristaltic pump actuator to actuate the peristaltic pump tube at a known revolutions per minute (“rpm”) to empty dialysis fluid from a full first chamber to the second chamber, wherein air backfills the first chamber from the third chamber, (ii) receive a signal from the pair of capacitive sensing plates indicating that the first chamber is empty, (iii) record a time duration Δt needed to empty dialysis fluid from the full first chamber to the second chamber, (iv) determine a current volume per revolution for the peristaltic pump actuator by performing a first division of a known volume of the first chamber by the time duration Δt and a second division of a result of the first division by the known rpm, and (v) use the current volume per revolution for at least one subsequent operation of the peristaltic pump actuator.