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 iso
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 detachable pump. Fluid handling devices may be generally rigid and of a spheroid shape, optionally with a diaphragm dividing the device into compartments.
대표청구항▼
1. A cassette-based fluid balancing system, comprising: a first liquid flow path connecting a first inlet to a first outlet;a second liquid flow path connecting a second inlet to a second outlet;a control fluid path configured for controlling a diaphragm pump;said pump comprising a rigid vessel cont
1. A cassette-based fluid balancing system, comprising: a first liquid flow path connecting a first inlet to a first outlet;a second liquid flow path connecting a second inlet to a second outlet;a control fluid path configured for controlling a diaphragm pump;said pump comprising a rigid vessel containing a diaphragm dividing the rigid vessel into a control compartment and a liquid pumping compartment, the control compartment of said pump being in fluidic communication with the control fluid path and the liquid pumping compartment being in fluidic communication with the second liquid flow path;a balancing chamber comprising a flexible diaphragm dividing the chamber into two liquid compartments, a first liquid compartment in fluidic communication with the first liquid flow path and a second liquid compartment in fluidic communication with the second liquid flow path;the balancing chamber configured to balance flow between the first liquid flow path and the second liquid flow path; anda first valve interposed between the liquid pumping compartment of the diaphragm pump and the second liquid compartment of the balancing chamber, said first valve under control of a controller; whereinthe controller is configured to operate the first valve using pulse-width modulation. 2. The system of claim 1, further comprising a second valve interposed between the second liquid compartment of the balancing chamber and the second outlet, wherein the controller is configured to operate the second valve so that it is closed while the first valve is operated using pulse-width modulation. 3. The system of claim 2, wherein while the second valve is closed, the controller operates the first valve using pulse-width modulation in a manner to provide a lower or more controlled pressure to the second liquid in the second liquid flow path as the first valve is being closed. 4. The system of claim 2, further comprising a third valve interposed between the first liquid compartment of the balancing chamber and the first inlet, wherein said first, second and third valves comprise membrane valves actuated by a control fluid, and wherein said second and third valves share a common control fluid line, causing said second and third valves to be opened together or closed together simultaneously. 5. A cassette-based fluid balancing system, comprising: a first liquid flow path connecting a first inlet to a first outlet;a second liquid flow path connecting a second inlet to a second outlet;a control fluid path configured for controlling a diaphragm pump;said pump comprising a rigid vessel containing a diaphragm dividing the rigid vessel into a control compartment and a liquid pumping compartment, the control compartment of said pump being in fluidic communication with the control fluid path and the liquid pumping compartment being in fluidic communication with the second liquid flow path;a balancing chamber comprising a rigid chamber with a flexible diaphragm dividing the chamber into two liquid compartments, a first liquid compartment in fluidic communication with the first liquid flow path and a second liquid compartment in fluidic communication with the second liquid flow path;the balancing chamber configured to balance flow between the first liquid flow path and the second liquid flow path; anda first membrane valve interposed between the liquid pumping compartment of the diaphragm pump and the second liquid compartment of the balancing chamber, said first membrane valve under control of a control system comprising at least one controller; whereinthe control system is configured to control application of a closing pressure to the first membrane valve so that pressure applied during closure of the first membrane valve is less than pressure applied to maintain the first membrane valve closed, and to control operation of the fluid balancing system so that the balancing chamber balances flow between the first liquid flow path and the second liquid flow path by displacing a volume of a first liquid in the first liquid compartment as a substantially equal volume of a second liquid is pumped into the second liquid compartment. 6. The system of claim 5, further comprising a second membrane valve interposed between the second liquid compartment of the balancing chamber and the second outlet, wherein the control system is configured to operate the second membrane valve so that it is maintained in a closed position while the first membrane valve is being closed. 7. The system of claim 6, wherein while pressure is applied to the second membrane valve to maintain it in a closed position, the control system operates the first membrane valve in a manner to apply a lower pressure or a more controlled pressure increase to the first membrane valve as it is being closed than the pressure being applied to the second membrane valve. 8. The system of claim 6, further comprising a third membrane valve interposed between the first liquid compartment of the balancing chamber and the first inlet, wherein said first, second and third membrane valves are actuated by a control fluid, and wherein said second and third membrane valves share a common control fluid line, causing said second and third membrane valves to be opened together or closed together simultaneously. 9. A cassette-based fluid balancing system for a hemodialysis apparatus, comprising: a first dialysate flow path connecting a first inlet to a first outlet;a second dialysate flow path connecting a second inlet to a second outlet;a control fluid path configured for controlling a diaphragm pump;said pump comprising a rigid vessel containing a diaphragm dividing the rigid vessel into a control compartment and a dialysate pumping compartment, the control compartment of said pump being in fluidic communication with the control fluid path and the dialysate pumping compartment being in fluidic communication with the second dialysate flow path;a balancing chamber comprising a rigid chamber with a flexible diaphragm dividing the chamber into two dialysate compartments, a first dialysate compartment in fluidic communication with the first dialysate flow path and a second dialysate compartment in fluidic communication with the second dialysate flow path;the balancing chamber configured to balance flow between the first dialysate flow path and the second dialysate flow path; anda first membrane valve interposed between the dialysate pumping compartment of the diaphragm pump and the second dialysate compartment of the balancing chamber, said first membrane valve under control of a control system comprising at least one controller; whereinthe control system is configured to control application of a closing pressure to the first membrane valve so that pressure applied during closure of the first membrane valve is less than pressure applied to maintain the first membrane valve closed, and to control operation of the fluid balancing system so that the balancing chamber balances flow between the first dialysate flow path and the second dialysate flow path by displacing a volume of a first dialysate in the first dialysate compartment as a substantially equal volume of a second dialysate is pumped into the second dialysate compartment. 10. The system of claim 9, further comprising a second membrane valve interposed between the second dialysate compartment of the balancing chamber and the second outlet, wherein the control system is configured to operate the second membrane valve so that it is maintained in a closed position while the first membrane valve is being closed. 11. The system of claim 10, wherein while pressure is applied to the second membrane valve to maintain it in a closed position, the control system operates the first membrane valve in a manner to apply a lower pressure or a more controlled pressure increase to the first membrane valve as it is being closed than the pressure being applied to the second membrane valve. 12. The system of claim 10, further comprising a third membrane valve interposed between the first dialysate compartment of the balancing chamber and the first inlet, wherein said first, second and third membrane valves are actuated by a control fluid, and wherein said second and third membrane valves share a common control fluid line, causing said second and third membrane valves to be opened together or closed together simultaneously.
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