BLOOD TREATMENT SYSTEMS AND METHODS
First Claim
1. A dialysis unit including:
- a dialysate flow circuit including a dialyzer; and
a field programmable gate array (FPGA) that monitors at least conductivity and temperature of dialysate in the flow circuit upstream of a dialyzer and enters a fail-safe state if the measured conductivity exceeds a value, and/or is outside of a range of values, wherein the value or range of values is different for different modes of therapy, or the value or range of values is different for different patients.
1 Assignment
0 Petitions
Accused Products
Abstract
Dialysis systems are disclosed comprising new fluid flow circuits. Systems may include blood and dialysate flow paths, where the dialysate flow path includes balancing, mixing, and/or directing circuits. Dialysate preparation may be decoupled from patient dialysis. Circuits may be defined within one or more cassettes. The fluid circuit fluid flow paths may be isolated from electrical components. A gas supply in fluid communication with the dialysate flow path and/or the dialyzer able to urge dialysate through the dialyzer and urge blood back to the patient may be included for certain emergency situations. Fluid handling devices, such as pumps, valves, and mixers that can be actuated using a control fluid, may be included. Control fluid may be delivered by an external pump or other device, which may be detachable and/or generally rigid, optionally with a diaphragm, dividing the device into first and second compartments.
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Citations
4 Claims
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1. A dialysis unit including:
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a dialysate flow circuit including a dialyzer; and a field programmable gate array (FPGA) that monitors at least conductivity and temperature of dialysate in the flow circuit upstream of a dialyzer and enters a fail-safe state if the measured conductivity exceeds a value, and/or is outside of a range of values, wherein the value or range of values is different for different modes of therapy, or the value or range of values is different for different patients. - View Dependent Claims (2)
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3. A dialysis unit including:
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a dialysate flow circuit including a dialyzer and an ultra-filtration pump; and a field programmable gate array that monitors an amount of ultrafiltration fluid withdrawn from a patient during dialysis treatment by the dialysis unit by setting a given register to a first value and increasing the value of the register by a first incremental value for every pump stroke of the ultra-filtration pump and decreasing the value of the register by a second incremental value for each pre-determined increment of time, wherein the field programmable gate array enters a fail-safe state if the value of the register exceeds a pre-determined maximum value.
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4. A dialysis unit including:
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a dialysate flow circuit including a dialyzer; and an automatic computer processing unit that verifies before a start of a treatment that a safety system mediated by a field programmable gate array (FPGA) is operating properly by exposing sensors in fluid paths in the dialysis unit to temperatures or conductivities that are outside pre-determined permissible ranges of values, and confirming that the FPGA safety system enters a fail-safe state in response to the temperatures or conductivites outside the predetermined permissible ranges of values, wherein the computer processing unit resets the FPGA after verifying that the safety system is operating properly by writing to one or more registers in the FPGA within a pre-determined interval of time.
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Specification