Method and device for the detection of disruptions of the blood flow in an extracorporeal blood circuit
First Claim
1. A method for the detection of disruptions of blood flow in an extracorporeal blood circuit during an extracorporeal blood treatment with an extracorporeal blood treatment apparatus, the extracorporeal blood circuit comprising an arterial branch leading to a blood treatment unit and a venous branch leading away from the blood treatment unit, the method comprising:
- measuring an oscillating pressure signal propagated in the extracorporeal blood circuit; and
analyzing the oscillating pressure signal, includingascertaining the phase angle of at least one harmonic of the oscillating pressure signal anddetecting a disruption of the blood flow in the extracorporeal blood circuit on the basis of the change in the phase angle of the at least one harmonic.
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Abstract
A method and device that identify impairments of the blood flow in an extra-corporeal blood circuit during extracorporeal treatment of the blood using an extracorporeal haemodialysis device, where the phase angle of at least one harmonic oscillation of an oscillating pressure signal that propagates in the extracorporeal blood circuit is determined. Impairments of the blood flow are detected in the extracorporeal blood circuit based on a characteristic modification of the phase angle of at least one harmonic oscillation of the pressure signal. A temporal modification of the phase angle may be compared with a predefined threshold value and an impairment is detected if the value of the modification of the phase angle is greater than the predefined threshold value. The method and device permit an early identification of a coagulation of the blood that flows through the haemodialysis unit, so that countermeasures can be initiated promptly.
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Citations
20 Claims
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1. A method for the detection of disruptions of blood flow in an extracorporeal blood circuit during an extracorporeal blood treatment with an extracorporeal blood treatment apparatus, the extracorporeal blood circuit comprising an arterial branch leading to a blood treatment unit and a venous branch leading away from the blood treatment unit, the method comprising:
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measuring an oscillating pressure signal propagated in the extracorporeal blood circuit; and analyzing the oscillating pressure signal, including ascertaining the phase angle of at least one harmonic of the oscillating pressure signal and detecting a disruption of the blood flow in the extracorporeal blood circuit on the basis of the change in the phase angle of the at least one harmonic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A device for the detection of disruptions of blood flow in an extracorporeal blood circuit during an extracorporeal blood treatment with an extracorporeal blood treatment apparatus, the extracorporeal blood circuit comprising an arterial branch leading to a blood treatment unit and a venous branch leading away from the blood treatment unit, the device comprising:
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a means for generating an oscillating pressure signal propagated in the extracorporeal blood circuit; a means for measuring the oscillating pressure signal; and a means for analyzing the oscillating pressure signal wherein the means for analyzing the oscillating pressure signal includes a means for determining the phase angle of at least one harmonic of the oscillating pressure signal and a means for detecting a change in the phase angle. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification