Dialysis system with cassette based balance chambers and volumetric pumps
First Claim
1. A dialysis system comprising:
- a fresh dialysis fluid membrane pump;
a spent dialysis fluid membrane pump;
a first fresh fluid flow path;
a first spent fluid flow path;
a second fresh fluid flow path;
a second spent fluid flow path;
a first balance chamber including a first rigid portion and a second rigid portion, and a flexible sheet located between the first and second rigid portions, the flexible sheet dividing the first balance chamber into (i) a fresh dialysis fluid compartment connected fluidly to the fresh dialysis fluid membrane pump via the first fresh fluid flow path, wherein fresh dialysis fluid contacts the first rigid portion and a first side of the flexible sheet, and (ii) a spent dialysis fluid compartment connected fluidly to the spent dialysis fluid membrane pump via the first spent fluid flow path, wherein spent dialysis fluid contacts the second rigid portion and a second side of the flexible sheet;
a second balance chamber including a first rigid portion and a second rigid portion, and a flexible sheet located between the first and second rigid portions, the flexible sheet dividing the second balance chamber into (i) a fresh dialysis fluid compartment connected fluidly to the fresh dialysis fluid membrane pump via the second fresh fluid flow path, wherein fresh dialysis fluid contacts the first rigid portion and a first side of the flexible sheet, and (ii) a spent dialysis fluid compartment connected fluidly to the spent dialysis fluid membrane pump via the second spent fluid flow path, wherein spent dialysis fluid contacts the second rigid portion and a second side of the flexible sheet; and
a dialysis fluid cassette carrying and in fluid communication with the first and second balance chambers, the dialysis fluid cassette including a fluid receiving portion for the fresh dialysis fluid membrane pump and a fluid receiving portion for the spent dialysis fluid membrane pump, wherein the first and second fresh fluid flow paths and the first and second spent fluid flow paths are provided by the dialysis fluid cassette.
1 Assignment
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Accused Products
Abstract
A dialysis system includes a fresh dialysis fluid membrane pump; a spent dialysis fluid membrane pump; a first balance chamber having a fresh dialysis fluid compartment connected fluidly to the fresh dialysis fluid membrane pump and a spent dialysis fluid compartment connected fluidly to the spent dialysis fluid membrane pump; a second balance chamber having a fresh dialysis fluid compartment connected fluidly to the fresh dialysis fluid membrane pump and a spent dialysis fluid compartment connected fluidly to the spent dialysis fluid membrane pump; and a dialysis fluid cassette, wherein at least one of the fresh dialysis fluid membrane pump, the spent dialysis fluid membrane pump, the first balance chamber and the second balance chamber includes a fluid receiving portion provided in the dialysis fluid cassette.
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Citations
20 Claims
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1. A dialysis system comprising:
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a fresh dialysis fluid membrane pump; a spent dialysis fluid membrane pump; a first fresh fluid flow path; a first spent fluid flow path; a second fresh fluid flow path; a second spent fluid flow path; a first balance chamber including a first rigid portion and a second rigid portion, and a flexible sheet located between the first and second rigid portions, the flexible sheet dividing the first balance chamber into (i) a fresh dialysis fluid compartment connected fluidly to the fresh dialysis fluid membrane pump via the first fresh fluid flow path, wherein fresh dialysis fluid contacts the first rigid portion and a first side of the flexible sheet, and (ii) a spent dialysis fluid compartment connected fluidly to the spent dialysis fluid membrane pump via the first spent fluid flow path, wherein spent dialysis fluid contacts the second rigid portion and a second side of the flexible sheet; a second balance chamber including a first rigid portion and a second rigid portion, and a flexible sheet located between the first and second rigid portions, the flexible sheet dividing the second balance chamber into (i) a fresh dialysis fluid compartment connected fluidly to the fresh dialysis fluid membrane pump via the second fresh fluid flow path, wherein fresh dialysis fluid contacts the first rigid portion and a first side of the flexible sheet, and (ii) a spent dialysis fluid compartment connected fluidly to the spent dialysis fluid membrane pump via the second spent fluid flow path, wherein spent dialysis fluid contacts the second rigid portion and a second side of the flexible sheet; and a dialysis fluid cassette carrying and in fluid communication with the first and second balance chambers, the dialysis fluid cassette including a fluid receiving portion for the fresh dialysis fluid membrane pump and a fluid receiving portion for the spent dialysis fluid membrane pump, wherein the first and second fresh fluid flow paths and the first and second spent fluid flow paths are provided by the dialysis fluid cassette. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A dialysis system comprising:
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a fresh dialysis fluid flow path; a spent dialysis fluid flow path; a dialysis fluid cassette providing the fresh and spent dialysis fluid flow paths and carrying and in fluid communication with a first rigid portion and a second rigid portion, the first and second rigid portions defining a chamber, a flexible sheet located between the rigid portions so as to form a fresh dialysis fluid compartment and a spent dialysis fluid compartment; a fresh dialysis fluid membrane pump including a fluid receiving portion provided by the dialysis fluid cassette; and a spent dialysis fluid membrane pump including a fluid receiving portion provided by the dialysis fluid cassette, wherein the fresh dialysis fluid membrane pump is in fluid communication with the fresh dialysis fluid compartment via the fresh dialysis fluid flow path and the spent dialysis fluid membrane pump is in fluid communication with the spent dialysis fluid compartment via the spent dialysis fluid flow path, the fresh dialysis fluid membrane pump causing fresh fluid to contact the first rigid portion and a first side of the flexible sheet forming the fresh dialysis fluid compartment, the spent dialysis fluid membrane pump causing spent fluid to contact the second rigid portion and a second side of the flexible sheet forming the spent dialysis fluid compartment. - View Dependent Claims (15, 16, 17, 18)
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19. A dialysis system comprising:
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a dialysis machine; and a dialysis fluid cassette configured and arranged to operate with the dialysis machine, the dialysis fluid cassette including fluid carrying portions for, a fresh membrane pump pair including first and second membrane pumps, the first membrane pump provided in parallel with the second membrane pump, a spent membrane pump pair including third and fourth membrane pumps, the third membrane pump provided in parallel with the fourth membrane pump, a first balance chamber including a fresh dialysis fluid compartment and a spent dialysis fluid compartment, the first and second membrane pumps of the fresh membrane pump pair in fluid communication with the fresh dialysis fluid compartment of the first balance chamber, the third and fourth membrane pumps of the spent membrane pump pair in fluid communication with the spent dialysate fluid compartment of the first balance chamber, and a second balance chamber including a fresh dialysis fluid compartment and a spent dialysis fluid compartment, the first and second membrane pumps of the fresh membrane pump pair in fluid communication with the fresh dialysis fluid compartment of the second balance chamber, the third and fourth membrane pumps of the spent membrane pump pair in fluid communication with the spent dialysate fluid compartment of the second balance chamber. - View Dependent Claims (20)
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Specification