If the tests do not show a failure a second time (for many of the failure modes), the disposable set can be held responsible for the leak and not the machine 150, e.g., the machine's pneumatic system and/or cassette/machine interface. The mixture of air and fluid 254 can sometimes slow and sometimes prevent proper priming. If not, a suitable alarm is posted informing the patient or operator that the drain bag 324 is positioned outside the operating parameters of system 300. Appendix A shows data from step one of the integrity test of the present disclosure. * Baxter Internal Data reported as of Jan 2017. 5. FIG. The drain line 56 has a bacteria retentive tip protector that passes to atmosphere air that leaks through the membranes 104 and 106 (FIGS. 24. 9). 24, when valves 318, 320, 328 and 332 are closed and fluid valves 326, 330, 342 and 344 are opened, fluid from solution bags 302 and 304 flows vertically down fluid pathways 310 and 312, respectively, into pump chambers 306 and 308. FIGS. 23 and 24 are schematic views illustrating a method and apparatus of the present invention that evaluates solution and drain bag head heights. Negative pressure tested areas (internal and external) are shown using a single hatch. Valves A3 and B4 are then closed. Occluder valve C6 is de-energized so that occluder 158 closes, pinching/sealing all fluid lines 54 to 66 exiting cassette 100. The description is based in part upon the “dry test”, implemented in the Baxter HomeChoice® cycler in December of 1998. Indeed, many procedural guides include a step of tapping a portion of the patient line when the line does not appear to be priming properly. Yet another advantage of the present invention is to provide a priming method and apparatus that detects when the patient or operator has inadvertently left a clamp on the priming line, so that the therapy machine can generate a suitable alarm. FIG. 13, a fourth step of the test tests the pump chambers P1 and P2, certain fluid pathways and certain valves using positive pressure and negative pressure. As indicated, the above testing procedure is performed after solution bags are connected to the peritoneal dialysis system. 7 is a perspective view of cassette 100 showing that the cassette 100 includes a housing 102, which is sealed on both sides by flexible membranes 104 and 106. Low positive pressure tank 220 is then pressurized to +5 psig and valve A3 is opened to empty pump chamber P1 through open fluid valve V10. In each of test steps two through five of FIGS. When P2 is pressurized, occluder 158 is opened, enabling chamber P1 to be evacuated. The third step begins by evacuating negative pressure tank 214 to −5 psig and opening valve B4 to fill pump chamber P2 in the cassette with air through open fluid valve V7. A third problem that occurs relatively often in priming is that the patient forgets to remove the clamp on the patient line prior to priming that line. Determining that the machine 150 is working properly and that the cassette 100 is causing the failure precludes swapping a patient's machine needlessly after an integrity failure because of uncertainty about whether the cassette 100 or machine 150 is responsible for the test failure. Tags: None. ** Based on video demonstrations. While no external source of positive pressure is provided, air can be drawn into pumping chamber 208, while fluid valve 212 is closed and actuator 202 and head 206 are moved forward to generate an internal pressure that is used to perform the disposable integrity tests described herein. 5, wherein flexible membranes of the cassette are exploded to show various inner components of the cassette. The cross-section shows membrane 106, divider 110 and a port 108 described above. The fluid pumped from chambers P1 and P2 is not meant to extend all the way to connector 260, rather, the pumped fluid is intended to flow through any trapped air at the proximal end of patient line 66, so that such air is not an impediment to priming. Pump actuator valve B1 is opened with fluid valves V3, V4, V6 and V7 open to pressurize the air in pump chamber P2, and to test the fluid pathways downstream of V3, V4, V6 and V7 for leakage across the occluder 158 and/or across the fluid channels within cassette 100. Low positive pressure tank 220 is pressurized to +5 psig and valve A3 is opened to empty pump chamber P1 through open fluid valve V8. © Copyright 2018 Baxter. Air leaking from the positively pressurized part of cassette 100 to the evacuated part is readily detectable as is air escaping from or leaking into cassette 100. Test steps three, four and five did however reveal the defects that test step two did not. The volume of liquid that does fill patient line 66 via the pump stroke of chambers P1 and P2 does, however, push some air through vented connector 260, leaving the line partially filled with solution and partially filled with air, wherein the air is collected at the distal end and the solution resides at the proximal end of line 66. Fluid flow stops when the vacuum in air/vacuum chambers 338 and 340, measured by pressure sensors 334 and 336, respectively, is equal to a column of solution (negative pressure head height) of height Y3 shown in FIG. 1. Importantly, test step one tests cassette 100 from the outside. 2 to 4, all tip protectors have to be removed for those test steps. 16 discussed above shows one alternative embodiment of the priming method of present invention, wherein system 200 replaces pneumatic pumps P1 and P2 in FIGS. Test steps two through five of the disposable integrity test of the present invention are able to leave the tip protectors in place because one part of the system is pressurized while the other is evacuated. If such pressure drop is not seen, the patient has likely forgotten to remove the clamp in the patient line and an error message is generated.
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