Method and device for monitoring the access to the cardiovascular system of a patient
First Claim
1. A method of monitoring a cardiovascular access during an extracorporeal blood treatment, comprising the steps of:
- providing an extracorporeal blood circuit comprising an arterial branch and a venous branch, the arterial branch connecting an arterial needle inserted into a patient to an inlet of a blood treatment device, the venous branch connecting an outlet of the blood treatment device to a venous needle inserted into a patient;
providing a conductive connection between the arterial branch and the venous branch, said conductive connection having first and second connection locations, wherein said first connection location is located upstream of the blood treatment device and said second connection location is located downstream of said blood treatment device;
circulating blood in the extracorporeal blood circuit;
generating a potential difference between the arterial branch and the venous branch;
detecting a value of a quantity corresponding to an electric current along at least one portion of the venous branch, said at least one portion being between the conductive connection and the venous needle; and
comparing the detected value to a reference range.
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Accused Products
Abstract
A device for monitoring the access to the cardiovascular system of a patient undergoing an extracorporeal treatment of blood in a machine (1) comprising a treatment device (4) and an extracorporeal circuit (2), comprises: a voltage generator (16) for generating a potential difference between a part of the machine (1) and a first point (B) of a venous branch (8) of the extracorporeal circuit (2), connecting the patient to the treatment device (4); a detector (17) for detecting the value (dV) of a quantity that correlates with the electric current along at least one section (10a; 10b; 10c) of the venous branch (10) between the first point (B) and a venous needle (13) fitted at the end of the venous branch (8) and inserted in the vascular system of the patient (P); calculating means (15) for comparing the detected value (dV) with a reference range (I).
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Citations
27 Claims
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1. A method of monitoring a cardiovascular access during an extracorporeal blood treatment, comprising the steps of:
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providing an extracorporeal blood circuit comprising an arterial branch and a venous branch, the arterial branch connecting an arterial needle inserted into a patient to an inlet of a blood treatment device, the venous branch connecting an outlet of the blood treatment device to a venous needle inserted into a patient;
providing a conductive connection between the arterial branch and the venous branch, said conductive connection having first and second connection locations, wherein said first connection location is located upstream of the blood treatment device and said second connection location is located downstream of said blood treatment device;
circulating blood in the extracorporeal blood circuit;
generating a potential difference between the arterial branch and the venous branch;
detecting a value of a quantity corresponding to an electric current along at least one portion of the venous branch, said at least one portion being between the conductive connection and the venous needle; and
comparing the detected value to a reference range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device for monitoring a cardiovascular access during an extracorporeal blood treatment comprising:
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a conductive connection arranged between a first passage point of an arterial branch of an extracorporeal blood circuit, and a second passage point of a venous branch of the extracorporeal blood circuit;
a voltage generator circuit configured to generate a potential difference between said first and second passage points when the extracorporeal blood circuit is connected to a patient through an arterial needle and a venous needle;
a detector circuit configured to detect a value of a quantity corresponding to an electric current along at least one section of the extracorporeal circuit, said at least one section of the extracorporeal circuit comprising;
a portion of the venous branch between the second passage point and the venous needle;
a portion of the arterial branch between the arterial needle and the first passage point; and
the conductive connection; and
a comparator circuit configured to compare the value to a reference range. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification