Method for regulating fluid pump pressure
DC CAFCFirst Claim
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1. A method for regulating pressure at a distal end of a fluid line, the method comprising:
- providing a fluid flow control system, the fluid flow control system having at least one liquid volume in valved communication with. the distal end, a control volume in pressure communication with the liquid volume, means for measuring pressure in the control volume, and means for adjusting the pressure in the control volume;
calibrating the means for measuring the pressure;
establishing communication between the liquid volume and the distal end;
measuring a pressure of the control volume; and
adjusting the pressure in the control volume in accordance with the measured pressure.
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Abstract
A method is provided for regulating fluid pump pressures by detecting an elevation differential between a fluid flow control device and the distal end of a fluid line in communication with the fluid flow control device. A fluid flow control device, for instance a peritoneal dialysis device, is at a first height, a distal end of a fluid line is at a second height, and a valved outlet, when open, affords communication between the fluid flow control device and the distal end of the fluid line. The elevation differential is correlatable with a pressure measurable during a calibration procedure provided as a part of the methodology.
232 Citations
26 Claims
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1. A method for regulating pressure at a distal end of a fluid line, the method comprising:
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providing a fluid flow control system, the fluid flow control system having at least one liquid volume in valved communication with. the distal end, a control volume in pressure communication with the liquid volume, means for measuring pressure in the control volume, and means for adjusting the pressure in the control volume;
calibrating the means for measuring the pressure;
establishing communication between the liquid volume and the distal end;
measuring a pressure of the control volume; and
adjusting the pressure in the control volume in accordance with the measured pressure. - View Dependent Claims (2, 3)
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4. A method for regulating pressure in a fluid line, the method comprising:
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providing a fluid flow control system, the fluid flow control system having at least one liquid volume in valved communication with a distal end of a fluid line;
isolating the liquid volume from the distal end;
measuring a first calibration pressure of a control volume in pressure communication with the liquid volume;
pressurizing the liquid volume;
measuring a second calibration pressure of the control volume;
establishing communication between the liquid volume and the distal end;
measuring a pressure of the control volume; and
adjusting the pressure in accordance with the measured pressure and the first and second calibration pressures. - View Dependent Claims (5, 6)
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7. A method for regulating pressure in a fluid line, the method comprising:
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providing a fluid flow control system, the fluid flow control system having at least one liquid volume in valved communication with a distal end of a fluid line;
isolating the liquid volume from the distal end;
measuring the pressure of a control volume in pressure communication with the liquid volume;
positively pressurizing the liquid volume;
measuring the pressure of the control volume while the liquid volume is positively pressurized;
negatively pressurizing the liquid volume;
measuring a pressure of the control volume while the liquid volume is negatively pressurized;
establishing communication between the liquid volume and the distal end;
measuring the pressure of the control volume; and
adjusting the pressure in accordance with the measured pressure. - View Dependent Claims (8, 9)
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10. A method for regulating pressure in a fluid line, the method comprising:
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providing a fluid flow control system, the fluid flow control system having means for measuring pressure, a first liquid volume and a second liquid volume, the first liquid volume in valved communication with the second liquid volume;
establishing valved communication between a distal end of the fluid line and the first liquid volume and the second liquid volume;
calibrating the means for measuring pressure;
establishing communication between the first liquid volume and the distal end;
measuring a pressure of a fluid in pressure equilibrium with liquid in the first liquid volume;
adjusting the pressure in accordance with the measured pressure. - View Dependent Claims (11, 12, 13, 14, 15)
isolating the liquid volumes from the distal end;
measuring a first calibration pressure of the fluid in pressure equilibrium with liquid in the first liquid volume and a first calibration pressure of a fluid in pressure equilibrium with liquid in the second liquid volume;
pressurizing the first liquid volume;
measuring a second calibration pressure of the fluid in pressure equilibrium with liquid in the second liquid volume; and
adjusting the pressure in accordance with the measured pressures.
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12. A method according to claim 10, wherein calibrating the means for measuring pressure comprises:
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isolating the liquid volumes from the distal end;
measuring a first calibration pressure of the fluid in pressure equilibrium with liquid in the first liquid volume and a first calibration pressure of a fluid in pressure equilibrium with liquid in the second liquid volume;
positively pressurizing the first liquid volume;
measuring a second calibration pressure of the fluid in pressure equilibrium with liquid in the second liquid volume while the first liquid volume is positively pressurized;
negatively pressurizing the first liquid volume;
measuring a third calibration pressure of the fluid in pressure equilibrium with liquid in the second liquid volume while the first liquid volume is negatively pressurized; and
adjusting the pressure in accordance with the measured pressures.
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13. A method according to claim 10, wherein each of the first and second liquid volumes includes a flexible membrane that separates the liquid volume from a control volume, and wherein the pressure measurements are taken from the control volume.
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14. A method according to claim 10, wherein the first and second liquid volumes are disposed within a cassette.
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15. A method according to claim 14, wherein the fluid flow control system includes a pump.
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16. A method for regulating pressure at a distal end of a fluid line, the method comprising:
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providing a fluid flow control system, the fluid flow control system having at least one liquid volume in valved communication with the distal end, a control volume in pressure communication with the liquid volume, a pressure transducer in communication with the control volume, and a pressure adjuster in communication with the control volume;
calibrating the pressure transducer;
establishing communication between the liquid volume and the distal end;
measuring a pressure of the control volume; and
adjusting the pressure in the control volume in accordance with the measured pressure. - View Dependent Claims (17, 18, 19, 20)
isolating the liquid volume from the distal end;
measuring a first calibration pressure of the control volume;
pressurizing the liquid volume; and
measuring a second calibration pressure of the control volume.
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18. A method according to claim 16, wherein calibrating the pressure transducer comprises:
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isolating the liquid volume from the distal end;
measuring the pressure of the control volume;
positively pressurizing the liquid volume;
measuring the pressure of the control volume while the liquid volume is positively pressurized;
negatively pressurizing the liquid volume; and
measuring the pressure of the control volume while the liquid volume is negatively pressurized.
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19. A method according to claim 16, wherein the liquid volume includes a flexible membrane that separates the liquid volume from the control volume.
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20. A method according to claim 16, wherein the fluid flow control system includes a pump.
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21. A method for regulating pressure in a fluid line, the method comprising:
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providing a fluid flow control system, the fluid flow control system having a pressure transducer, a first liquid volume and a second liquid volume, the first liquid volume in valved communication with the second liquid volume;
establishing valved communication between a distal end of the fluid line and the first liquid volume and the second liquid volume;
calibrating the pressure transducer;
establishing communication between the first liquid volume and the distal end;
measuring a pressure of a fluid in pressure equilibrium with liquid in the first liquid volume;
adjusting the pressure in accordance with the measured pressure. - View Dependent Claims (22, 23, 24, 25, 26)
isolating the liquid volumes from the distal end;
measuring a first calibration pressure of the fluid in pressure equilibrium with liquid in the first liquid volume and a first calibration pressure of a fluid in pressure equilibrium with liquid in the second liquid volume;
pressurizing the first liquid volume;
measuring a second calibration pressure of the fluid in pressure equilibrium with liquid in the second liquid volume; and
adjusting the pressure in accordance with the measured pressures.
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23. A method according to claim 21, wherein calibrating the pressure transducer comprises:
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isolating the liquid volumes from the distal end;
measuring a first calibration pressure of the fluid in pressure equilibrium with liquid in the first liquid volume and a first calibration pressure of a fluid in pressure equilibrium with liquid in the second liquid volume;
positively pressurizing the first liquid volume;
measuring a second calibration pressure of the fluid in pressure equilibrium with liquid in the second liquid volume while the first liquid volume is positively pressurized;
negatively pressurizing the first liquid volume;
measuring a third calibration pressure of the fluid in pressure equilibrium with liquid in the second liquid volume while the first liquid volume is negatively pressurized; and
adjusting the pressure in accordance with the measured pressures.
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24. A method according to claim 21, wherein each of the first and second liquid volumes includes a flexible membrane that separates the liquid volume from a control volume, and wherein the pressure measurements are taken from the control volume.
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25. A method according to claim 21, wherein the first and second liquid volumes are disposed within a cassette.
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26. A method according to claim 25, wherein the fluid flow control system includes a pump.
Specification