HEMODIALYSIS SYSTEMS AND METHODS
First Claim
1. A hemodialysis system comprising:
- a dialysis unit comprising an automation computer and dialysis equipment;
a user interface unit comprising a user interface computer and a user interface, the user interface being adapted to display information and receive inputs;
wherein the automation computer is configured to receive requests for safety-critical information from the user interface computer, and the automation computer is configured to access the safety-critical information on behalf of the user interface computer; and
wherein the user interface computer is configured to display information related to a dialysis process via the user interface using the safety-critical information.
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Accused Products
Abstract
Hemodialysis dialysis systems are disclosed. Hemodialysis systems of the invention may include a dialysate flow path including a balancing circuit, a mixing circuit, and/or a directing circuit. The circuits may be defined within one or more cassettes. The fluid circuits may be at least partially isolated, spatially and/or thermally, from electrical components of the system. A gas supply may be provided in fluid communication with the dialysate flow path and/or the dialyzer to urge dialysate through the dialyzer and blood back to the patient. The hemodialysis systems may include fluid handling devices, actuated using a control fluid, optionally delivered using a detachable pump. Fluid handling devices may be generally rigid and of a spheroid shape, optionally with a diaphragm dividing the device into compartments.
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Citations
33 Claims
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1. A hemodialysis system comprising:
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a dialysis unit comprising an automation computer and dialysis equipment; a user interface unit comprising a user interface computer and a user interface, the user interface being adapted to display information and receive inputs; wherein the automation computer is configured to receive requests for safety-critical information from the user interface computer, and the automation computer is configured to access the safety-critical information on behalf of the user interface computer; and wherein the user interface computer is configured to display information related to a dialysis process via the user interface using the safety-critical information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of managing a user interface in a hemodialysis system, the method comprising:
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receiving an input related to a dialysis process at a user interface associated with a user interface computer; in response to the input, transmitting a request for safety-critical information from the user interface computer to an automation computer associated with dialysis equipment; accessing the safety-critical information on behalf of the user interface computer; and using the safety-critical information, displaying information related to the dialysis process via the user interface. - View Dependent Claims (15, 16, 17, 18, 19)
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20. Computer storage media encoded with instructions that, when executed, perform a method comprising acts of:
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receiving, from a user interface associated with a user interface computer, an input related to a dialysis process; in response to the input, transmitting a request for safety-critical information from the user interface computer to an automation computer associated with dialysis equipment; accessing the safety-critical information on behalf of the user interface computer; transmitting the safety-critical information to the user interface computer; accessing screen design information stored within the user interface computer; using the safety-critical information and the screen design information, causing the user interface to display information related to the dialysis process.
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21. A pumping cassette, comprising:
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at least one fluid inlet; at least one fluid outlet; a flow path connecting the at least one fluid inlet and the at least one fluid outlet, the flow path passing through a balancing chamber and a second fluid inlet connectable to a source of anticoagulant, wherein fluid entering the at least one fluid inlet passes the second fluid inlet prior to entering the balancing chamber. - View Dependent Claims (22)
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23. A cassette, comprising:
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a first flow path connecting a first inlet to a first outlet; a second flow path connecting a second inlet to a second outlet; a control fluid path; at least two pumps, each pump comprising a rigid vessel containing a diaphragm dividing the rigid vessel into a first compartment and a second compartment, the first compartment of each pump being in fluidic communication with the control fluid path and the second compartment being in fluidic communication with the second flow path; a balancing chamber able to balance flow between the first flow path and the second flow path; and a control device able to open at least one valve directly controlling fluid within the balancing chamber using pulse-width modulation. - View Dependent Claims (24)
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25. A hemodialysis system, comprising:
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a blood flow path through which untreated blood is drawn from a patient and passed through a dialyzer; a dialysate flow path through which dialysate flows from a dialysate supply through the dialyzer, the dialysate flow path and the blood flow path being in fluidic communication; and a pressure device able to urge dialysate in the dialysate flow path to flow into the blood flow path, wherein pressure is controlled within the pressure device such that the pressure of the dialysate exiting the dialyzer is lower than the pressure of the blood exiting the dialyzer. - View Dependent Claims (26, 27)
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28. A hemodialysis system, comprising:
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a blood flow path through which untreated blood is drawn from a patient and passed through a dialyzer; a dialysate flow path through which dialysate flows from a dialysate supply through the dialyzer, the dialysate flow path and the blood flow path being in fluidic communication; and a pressure device able to urge dialysate in the dialysate flow path to flow into the blood flow path, wherein pressure is controlled within the pressure device such that the pressure of the dialysate entering the dialyzer is greater than the pressure of the blood entering the dialyzer. - View Dependent Claims (29, 30)
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31. A method, comprising:
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providing a hemodialysis system, comprising; a blood flow path through which blood is drawn from a patient and passed through a dialyzer; and a dialysate flow path through which dialysate flows from a dialysate supply through the dialyzer, the dialysate flow path comprising; a balancing cassette which controls the amount of dialysate passing through the dialyzer, a mixing cassette which forms dialysate from water, and a directing cassette which passes water from a water supply to the mixing cassette and passes dialysate from the mixing cassette to the balancing cassette; and passing dialysate through the dialyzer such that dialysate is pushed through the dialyzer into the blood flow path and is pulled back with every dialysate pump stroke. - View Dependent Claims (32, 33)
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Specification