Method and device for determining blood volume during an extracorporeal blood treatment
First Claim
1. A method for the determination of a blood volume during an extracorporeal blood treatment with a blood treatment apparatus in an extracorporeal blood circuit, wherein the extracorporeal blood circuit includes an arterial branch of a blood line leading to the blood treatment apparatus and a venous branch of the blood line leading away from the blood treatment apparatus, the method comprising:
- generating pulse waves that originate in the extracorporeal blood circuit, wherein the pulse waves have at least one of a propagation rate and a transit time;
measuring the at least one of the propagation rate and the transit time of the pulse waves; and
determining the blood volume from the at least one of the measured propagation rate and the measured transit time of the pulse waves.
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Abstract
The invention relates to a method for determining blood volume during extracorporeal blood circulation, which is based on measuring the propagation rate or propagation time of the pulse waves propagating in the extracorporeal circulation system. The invention preferably involves the measurement of the propagation rate or propagation time of the pulse waves generated by the blood pump, which is placed in arterial branch of the blood line. The device for determining blood volume can make use of the pressure sensor, which is placed in the venous branch of the blood line and which is already provided in prior art blood treatment devices. As a result, the amount of equipment required is relatively low.
44 Citations
18 Claims
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1. A method for the determination of a blood volume during an extracorporeal blood treatment with a blood treatment apparatus in an extracorporeal blood circuit, wherein the extracorporeal blood circuit includes an arterial branch of a blood line leading to the blood treatment apparatus and a venous branch of the blood line leading away from the blood treatment apparatus, the method comprising:
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generating pulse waves that originate in the extracorporeal blood circuit, wherein the pulse waves have at least one of a propagation rate and a transit time; measuring the at least one of the propagation rate and the transit time of the pulse waves; and determining the blood volume from the at least one of the measured propagation rate and the measured transit time of the pulse waves. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for the determination of the blood volume during an extracorporeal blood treatment in an extracorporeal blood circuit, wherein the extracorporeal blood circuit includes an arterial branch of a blood line leading to a blood treatment apparatus and a venous branch of the blood line leading away from the blood treatment apparatus, the device comprising:
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means for generating pulse waves that originate in the extracorporeal blood circuit, wherein the pulse waves have at least one of a propagation rate and a transit time; means for measuring the at least one of the propagation rate and the transit time of the pulse waves; and an analyzing unit configured to determine the blood volume from the at least one of the measured propagation rate and the measured transit time of the pulse waves. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification