Sensor calibration and blood volume determination
First Claim
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1. A method for measuring a blood volume change, the method comprising:
- (a) connecting an arterial tubing portion of a dialysis system to withdraw blood from a patient and connecting a venous tubing portion of the dialysis system to deliver filtered blood to the patient;
(b) operably coupling an optical sensor to the venous tubing portion of the dialysis system;
(c) changing an ultrafiltration rate of the dialysis system;
(d) determining at least one photometric property of blood at the venous tubing portion of dialysis system;
(e) determining a calibration coefficient of at least the optical sensor; and
(f) determining a blood volume change corresponding to the calibration coefficient.
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Abstract
A method and device for the continuous real-time monitoring of relative blood volume change, based on registration of blood hemoglobin concentration, during long periods of time, such as dialysis session. A method and device for cardiac output measurement during dialysis, surgeries, intensive care procedure is provided. Calibration of a sensor in response to a change in a measureable blood property is determined from a coefficient corresponding to a change in the measured blood property.
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8 Claims
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1. A method for measuring a blood volume change, the method comprising:
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(a) connecting an arterial tubing portion of a dialysis system to withdraw blood from a patient and connecting a venous tubing portion of the dialysis system to deliver filtered blood to the patient;
(b) operably coupling an optical sensor to the venous tubing portion of the dialysis system;
(c) changing an ultrafiltration rate of the dialysis system;
(d) determining at least one photometric property of blood at the venous tubing portion of dialysis system;
(e) determining a calibration coefficient of at least the optical sensor; and
(f) determining a blood volume change corresponding to the calibration coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification