Dialysis system with a varying rate ultrafiltration profile
First Claim
1. A dialysis system comprising:
- a membrane blood pump provided by a first cassette;
a dialyzer in fluid communication with the membrane blood pump;
first and second dialysis fluid balance chambers each provided with the first cassette or with a second cassette, the first and second dialysis fluid balance chambers each having (i) a fresh dialysis fluid compartment in fluid communication with the dialyzer and (ii) a spent dialysis fluid compartment;
a fresh dialysis fluid membrane pump provided with the first cassette or with the second cassette, the fresh dialysis fluid membrane pump in fluid communication with the fresh dialysis fluid compartments of the first and second balance chambers; and
a spent dialysis fluid membrane pump provided with the first cassette or with the second cassette, the spent dialysis fluid membrane pump in fluid communication with the dialyzer and the spent dialysis fluid compartments of the first and second balance chambers,wherein the system is configured to operate according to a varying rate ultrafiltration profile, andwherein the first and second balance chambers operate with the fresh dialysis fluid membrane pump and the spent dialysis fluid membrane pump such that(i) during an exchange cycle, fresh dialysis fluid is sent to the dialyzer, and(ii) during an ultrafiltration cycle, no fresh dialysis fluid is sent to the dialyzer, and the spent dialysis fluid is sent to a drain, and(iii) a frequency of ultrafiltration cycles with respect to exchange cycles is variable according to the varying rate ultrafiltration profile.
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Accused Products
Abstract
A dialysis system includes a dialysis fluid cassette-based membrane blood pump; a dialyzer in fluid communication with the blood pump; first and second dialysis fluid cassette-based balance chambers each having (i) a fresh dialysis fluid compartment in fluid communication with the dialyzer and (ii) a spent dialysis fluid compartment; a dialysis fluid cassette-based fresh dialysis fluid membrane pump in fluid communication with the fresh dialysis fluid compartments of the first and second balance chambers; a dialysis fluid cassette-based spent dialysis fluid membrane pump in fluid communication with the dialyzer and the spent dialysis fluid compartments of the first and second balance chambers; and arterial and venous lines in fluid communication with the dialyzer for patient connection, the arterial and venous lines each including a contact used for electrically detecting a patient access disconnection.
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Citations
20 Claims
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1. A dialysis system comprising:
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a membrane blood pump provided by a first cassette; a dialyzer in fluid communication with the membrane blood pump; first and second dialysis fluid balance chambers each provided with the first cassette or with a second cassette, the first and second dialysis fluid balance chambers each having (i) a fresh dialysis fluid compartment in fluid communication with the dialyzer and (ii) a spent dialysis fluid compartment; a fresh dialysis fluid membrane pump provided with the first cassette or with the second cassette, the fresh dialysis fluid membrane pump in fluid communication with the fresh dialysis fluid compartments of the first and second balance chambers; and a spent dialysis fluid membrane pump provided with the first cassette or with the second cassette, the spent dialysis fluid membrane pump in fluid communication with the dialyzer and the spent dialysis fluid compartments of the first and second balance chambers, wherein the system is configured to operate according to a varying rate ultrafiltration profile, and wherein the first and second balance chambers operate with the fresh dialysis fluid membrane pump and the spent dialysis fluid membrane pump such that (i) during an exchange cycle, fresh dialysis fluid is sent to the dialyzer, and (ii) during an ultrafiltration cycle, no fresh dialysis fluid is sent to the dialyzer, and the spent dialysis fluid is sent to a drain, and (iii) a frequency of ultrafiltration cycles with respect to exchange cycles is variable according to the varying rate ultrafiltration profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A dialysis system comprising:
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a membrane blood pump; a dialyzer in fluid communication with the membrane blood pump; first and second dialysis fluid balance chambers, the first and second dialysis fluid balance chambers each having (i) a fresh dialysis fluid compartment in fluid communication with the dialyzer and (ii) a spent dialysis fluid compartment; a fresh dialysis fluid membrane pump, the fresh dialysis fluid membrane pump in fluid communication with the fresh dialysis fluid compartments of the first and second balance chambers; and a spent dialysis fluid membrane pump, the spent dialysis fluid membrane pump in fluid communication with the dialyzer and the spent dialysis fluid compartments of the first and second balance chambers; wherein the system is configured to operate according to a varying rate ultrafiltration profile in which a frequency of ultrafiltration cycles with respect to exchange cycles is varied, and wherein the first and second balance chambers operate with the fresh dialysis fluid membrane pump and the spent dialysis fluid membrane pump such that (i) during the exchange cycle, fresh dialysis fluid is sent to the dialyzer, and (ii) during the ultrafiltration cycle, no fresh dialysis fluid is sent to the dialyzer and spent dialysis fluid in at least one of the first or second balance chambers is sent to a drain. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification