Pneumatically driven peritoneal dialysis machine

2-3. (canceled)

4:

• The PD system of claim 1, wherein the cycler includes a pump actuation chamber covered in operation by the pneumatic side of the flexible sheet, the pneumatic delivery line and the pneumatic suction line in selective pneumatic communication with the pump actuation chamber.

5:

• The PD system of claim 1, further comprising a pneumatic rigid plastic shell connected to the pump chamber so as to seal the flexible sheet between the pneumatic rigid plastic shell and the pump chamber,
• wherein the pneumatic delivery line and the pneumatic suction line are in selective pneumatic communication with a port provided by the pneumatic rigid plastic shell.

6:

• The PD system of claim 1, wherein the pneumatic delivery line and the pneumatic suction line extend to a common pneumatic line,
• wherein the air flow sensor and the pneumatic pressure sensor are in operable communication with the common pneumatic line.

7:

• The PD system of claim 6, further comprising an air temperature sensor in operable communication with the common pneumatic line, the control unit further configured to integrate outputs from the air temperature sensor to determine the amount of fresh or used PD fluid that has been discharged from the pump chamber.

8:

• The PD system of claim 1, further comprising a first pneumatic valve located along the delivery line and a second pneumatic valve located along the pneumatic suction line, the first and second pneumatic valves providing selective pneumatic communication with the pneumatic side of the flexible sheet.

9:

• The PD system of claim 1, wherein the air pump is pneumatically coupled to positive and negative pneumatic storage vessels.

10:

• The PD system of claim 1, wherein the control unit is configured to integrate outputs from the air flow sensor and the pneumatic pressure sensor over time using an algorithm derived from the Ideal Gas Law.

11:

• The PD system of claim 1, wherein the control unit is configured to integrate outputs from the air flow sensor and the pneumatic pressure sensor over time for (i) an initial pneumatic pressurization of the pump chamber to determine an initial chamber volume and (ii) a final pneumatic pressurization of the pump chamber to determine a final chamber volume, the control unit further configured to determine an amount of fresh or used PD fluid drawn into the pump chamber by subtracting the initial chamber volume from the final chamber volume.

12:

• The PD system of claim 11, wherein the control unit is configured to cause negative pneumatic pressure to be applied to the pump chamber with one of the plurality of fluid valves opened between the initial pneumatic pressurization and the final pneumatic pressurization.

13:

• The PD system of claim 11, wherein the control unit is configured to cause at least one pneumatic line to be vented prior to each of the initial pneumatic pressurization and the final pneumatic pressurization.

14:

• The PD system of claim 11, wherein the control unit is further configured to use (a) the output from the air flow sensor or (b) the amount of fresh or used PD fluid drawn into the pump chamber to at least partially determine at least one of (i) a partial or full line occlusion, (ii) a PD fluid container or patient empty condition, or (iii) a presence of air.

15:

• The PD system of claim 14, wherein the control unit is configured to use the amount of fresh or used PD fluid discharged from the pump chamber to confirm or fully determine at least one of (i) the partial or full line occlusion, or (ii) the PD fluid container or patient empty condition.

16:

• The PD system of claim 14, wherein the control unit is configured to attempt to have fresh or used PD fluid pushed through a same line from which fresh or used PD fluid has just previously been subjected to a fresh or used PD fluid draw to determine between (i) the partial or full line occlusion, and (ii) the PD fluid container or patient empty condition.

(canceled)

20:

• The PD system of claim 18, wherein the control unit is configured to cause at least one pneumatic line to be vented prior to each of the initial pneumatic pressurization and the final pneumatic pressurization.

21:

• The PD system of claim 18, wherein the control unit is further configured to use (a) the output from the air flow sensor or (b) the amount of fresh or used PD fluid drawn into the pump chamber to at least partially determine at least one of (i) a partial or full line occlusion, (ii) a PD fluid container or patient empty condition, or (iii) a presence of air.

22:

• The PD system of claim 21, wherein the control unit is configured to attempt to have fresh or used PD fluid pushed through a same line from which fresh or used PD fluid has just previously been subjected to a fresh or used PD fluid draw to determine between (i) the partial or full line occlusion, and (ii) the PD fluid container or patient empty condition.