METHOD AND DEVICE FOR MONITORING AN EXTRACORPOREAL BLOOD CIRCUIT
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Abstract
To monitor an extracorporeal blood circuit during extracorporeal blood treatment, the arterial pressure and venous pressure in the arterial branch and venous branch of the extracorporeal circuit are measured by pressure sensors, and the sum Ps and the difference ΔP of the arterial pressure and/or venous pressure measured at the same time are calculated. A possible error state is indicated when the sum Ps and/or difference ΔP lie outside predetermined limit value windows A and B. To reduce the susceptibility to error, a check is preferably also made to ascertain whether the two above conditions are satisfied for n successive measurements.
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Citations
31 Claims
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1-12. -12. (canceled)
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13. A method for monitoring an extracorporeal blood circuit during extracorporeal blood treatment, in which blood flows from an arterial vascular access, through an arterial branch of an extracorporeal blood circuit, into a blood treatment device, through a venous branch of the extracorporeal circuit, and to a venous vascular access, comprising:
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(a) at time tn, measuring an arterial pressure (Part) in the arterial branch of the extracorporeal circuit; (b) at time tn, measuring a venous pressure (Pven) in the venous branch of the extracorporeal circuit; (c) calculating at least one of a sum (PS) of the arterial pressure and the venous pressure measured at time tn and a difference (Δ
P) of the arterial pressure and the venous pressure measured at time tn; and(d) comparing the at least one of PS at time tn to a predetermined limit value window A, and Δ
P at time tn to a predetermined limit value window B. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A device for detecting an error state in extracorporeal blood treatment comprising:
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an extracorporeal blood circuit comprising an arterial blood conduit connected to an inlet of a blood treatment device and to an arterial attachment for a vascular access, and a venous blood conduit connected to an outlet of the blood treatment device and to a venous attachment for the vascular access; an arterial pressure sensor for measuring the pressure in the arterial blood conduit; a venous pressure sensor for measuring the pressure in the venous blood conduit; a computing unit adapted to calculate at least one of a sum (PS) of the values of arterial pressure and venous pressure measured at time tn, and a difference (Δ
P) of the values of the arterial pressure and venous pressure measured at time tn;an evaluation unit cooperating with the computing unit during the blood treatment to continuously compare the at least one of PS and Δ
P to respective predetermined limit values. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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Specification