Method and Systems for Controlling Ultrafiltration Using Central Venous Pressure Measurements
First Claim
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1. A method for regulating a volume of fluid removed from a patient during renal dialysis, the method comprising:
- a. Placing a catheter into a central vena cava of the patient;
b. Connecting said catheter to a blood circuit of a dialysis system, wherein said blood circuit comprises a pressure sensor and a dialyzer and wherein said pressure sensor is upstream from said dialyzer;
c. Operating said dialysis system to circulate blood of said patient through said blood circuit;
d. Measuring a pressure value indicative of a central venous pressure of said patient using said pressure sensor; and
e. Adjusting an ultrafiltration rate based on the measured pressure value.
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Abstract
The volume of fluid removed from a patient during ultrafiltration is controlled automatically on the basis of central venous pressure (CVP) measurements. In one embodiment, a central venous catheter (CVC) is used for accessing blood during dialysis. A sensor located at the tip of the catheter or inside the dialysis machine is used to periodically measure CVP. CVP feedback data helps prevent the excessive removal of fluids from the patient.
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Citations
20 Claims
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1. A method for regulating a volume of fluid removed from a patient during renal dialysis, the method comprising:
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a. Placing a catheter into a central vena cava of the patient; b. Connecting said catheter to a blood circuit of a dialysis system, wherein said blood circuit comprises a pressure sensor and a dialyzer and wherein said pressure sensor is upstream from said dialyzer; c. Operating said dialysis system to circulate blood of said patient through said blood circuit; d. Measuring a pressure value indicative of a central venous pressure of said patient using said pressure sensor; and e. Adjusting an ultrafiltration rate based on the measured pressure value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 20)
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11. A method for regulating a volume of fluid removed from a patient during renal dialysis, the method comprising:
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a. Placing a catheter into a central vena cava of the patient, wherein said catheter comprises a sensor; b. Connecting said catheter to a blood circuit of a dialysis system; c. Operating said dialysis system to circulate blood of said patient through said blood circuit; d. Measuring a pressure value indicative of a central venous pressure of said patient using said sensor; and e. Adjusting an ultrafiltration rate based on the measured pressure value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification