Priming, integrity and head height methods and apparatuses for medical fluid systems
First Claim
1. A dialysis machine under control of a processor, the machine comprising:
- an actuation unit configured to accept a disposable medical fluid cassette that includes a flexible membrane, the cassette arranged to receive a medical fluid;
the actuation unit ant processor programmed to;
in a first integrity test, and before liquid is admitted to the cassette, provide a positive pressure to first and second portions of an outer surface of the membrane of the cassette and simultaneously provide a negative pressure to third and fourth portions of the inner surface of the membrane of the cassette and measure a decay of the pressures, wherein at least three successive pressure readings are taken in a first time period; and
in a second integrity test, and before liquid is admitted to the cassette, provide positive pressure to the inner surface of the first and third portions while providing negative pressure to the inner surface of the second and fourth portions of the membrane of the cassette and measure a decay of the pressures, wherein at least first, second and third successive positive pressure readings and at least first, second and third successive negative pressure readings are taken in a second time period, wherein differences between the successive positive pressure readings and differences between the successive negative pressure readings are used to determine whether the cassette passes or fails the second integrity test.
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Accused Products
Abstract
Improved integrity test, priming sequence and bag height detection tests, apparatuses and methods for a medical fluid delivery system are provided. The integrity test includes a plurality of air pressure decay tests, using positive and negative pressure. The priming sequence includes pumping fluid through a portion of a patient line to be primed to overcome air in the line and other potential obstacles. The head height test measures a pressure build-up or drop-off within a pump chamber of a membrane pump. The measured pressure corresponds to a head height between a fluid supply and the pump or between the pump and a fluid drain. A determination is made whether the corresponding head height is acceptable.
205 Citations
13 Claims
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1. A dialysis machine under control of a processor, the machine comprising:
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an actuation unit configured to accept a disposable medical fluid cassette that includes a flexible membrane, the cassette arranged to receive a medical fluid; the actuation unit ant processor programmed to; in a first integrity test, and before liquid is admitted to the cassette, provide a positive pressure to first and second portions of an outer surface of the membrane of the cassette and simultaneously provide a negative pressure to third and fourth portions of the inner surface of the membrane of the cassette and measure a decay of the pressures, wherein at least three successive pressure readings are taken in a first time period; and in a second integrity test, and before liquid is admitted to the cassette, provide positive pressure to the inner surface of the first and third portions while providing negative pressure to the inner surface of the second and fourth portions of the membrane of the cassette and measure a decay of the pressures, wherein at least first, second and third successive positive pressure readings and at least first, second and third successive negative pressure readings are taken in a second time period, wherein differences between the successive positive pressure readings and differences between the successive negative pressure readings are used to determine whether the cassette passes or fails the second integrity test. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification