Method and device for recognition of paravasal bleeding
First Claim
1. A method of detecting perivascular bleeding when blood is being fed to and/or taken away from a vascular access via at least one line, the pressure being measured in the at least one line, the method comprising:
- determining a value of a non-linear function of the difference between the measured pressure and a preset reference value;
comparing the value of the non-linear function with a preset limiting value; and
determining that there is perivascular bleeding based on an exceeding of the limiting value by the value of the non-linear function.
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Accused Products
Abstract
A method and a device for recognition of paravasal bleeding upon a supplying of blood to a vascular access via a line and/or upon the removal of blood from a vascular access via a line is provided. A device for extracorporeal blood treatment comprising a device for recognition of paravasal bleeding is also provided. The method and the device are based on the change of arterial pressure in the arterial branch or the venous pressure in the venous branch of the extra-corporeal circuit being registered during the extracorporeal blood treatment. One aspect of the method and the device is that pressure changes that come from a pressure level exhibiting a large difference from a reference value are more strongly considered than those that come from a pressure level that exhibits only a minor difference from the reference value.
11 Citations
26 Claims
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1. A method of detecting perivascular bleeding when blood is being fed to and/or taken away from a vascular access via at least one line, the pressure being measured in the at least one line, the method comprising:
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determining a value of a non-linear function of the difference between the measured pressure and a preset reference value; comparing the value of the non-linear function with a preset limiting value; and determining that there is perivascular bleeding based on an exceeding of the limiting value by the value of the non-linear function. - View Dependent Claims (2, 3, 10, 11, 25)
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4. A method of detecting perivascular bleeding during an extra-corporeal blood treatment in which blood flows from an arterial vascular access via an arterial segment of an extra-corporeal blood circuit into a blood treatment device and from the blood treatment device via a venous segment of the extra-corporeal blood circuit to a venous vascular access, the arterial pressure in the arterial segment of the extra-corporeal blood circuit and/or the venous pressure in its venous segment being measured, the method further comprising:
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determining at least one of (a) a first value, of a non-linear function of the difference between the arterial pressure which is measured and a preset reference value for the arterial pressure and (b) a second value, of a non-linear function of the difference between the venous pressure which is measured and a preset reference value for the venous pressure; at least one of (a) comparing the first value with a first limiting value and (b) comparing the second value with a second limiting value; and determining that there is perivascular bleeding based on (a) the first limiting value being exceeded and/or (b) the second limiting value being exceeded. - View Dependent Claims (5, 6, 7, 8, 9)
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12. An arrangement for detecting perivascular bleeding when blood is being fed to and/or taken away from a vascular access via at least one line, the pressure being measured in the at least one line, the arrangement for detecting perivascular bleeding including means of measuring the pressure in the at least one line, the arrangement comprising:
an analyzing and calculating unit configured to (a) determine a non-linear function of the difference between a measured pressure and a preset reference value, (b) compare the value of the non-linear function with a preset limiting value, and (c) determine that there is perivascular bleeding based on the limiting value being exceeded. - View Dependent Claims (13, 14, 26)
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15. An arrangement for detecting perivascular bleeding during extra-corporeal blood treatment by an extra-corporeal blood treatment apparatus, the extra-corporeal blood treatment apparatus including (a) an arterial blood line belonging to an extra-corporeal blood circuit, which arterial blood line is connected to the inlet of a blood treating means at one end and is provided with an arterial connection for an arterial vascular access at the other end, (b) a venous blood line belonging to the extra-corporeal blood circuit, the venous blood line being connected to the outlet of the blood treating means at one end and is provided with a venous connection for a venous vascular access at the other end, and (c) means for measuring the arterial pressure in the arterial segment of the extra-corporeal blood circuit and/or the venous pressure in its venous segment, the arrangement comprising:
an analyzing and calculating unit configured to (a) determine a first value, of a non-linear function of the difference between the measured arterial pressure and a preset reference value for the arterial pressure and/or determine a second value, of a non-linear function of the difference between the measured venous pressure and a preset reference value for the venous pressure, (b) compare the first value with a first preset limiting value and/or compare the second value with a second preset limiting value, and (c) determine that there is perivascular bleeding based on the first limiting value and/or the second limiting value being exceeded. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
Specification