Method and device for sensing the detachment of the venous needle from a patient during an extracorporeal blood treatment in a dialysis machine
First Claim
1. A device for monitoring a cardiovascular access of a patient, comprising:
- an extracorporeal blood circuit having a venous branch connected to a cardiovascular access of a patient;
an electrical line external to said extracorporeal blood circuit and having a first branch connected to said venous branch and a second branch connected to the patient either directly or through earth;
a voltage source located between said first branch and said second branch;
a sensor located in said first branch or in said second branch for supplying a signal corresponding to an electric current; and
means for processing said signal to determine the state of said cardiovascular access.
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Accused Products
Abstract
A method of sensing the detachment of the venous needle (13) from a patient (P) during an extracorporeal blood treatment in a dialysis machine (1) having an extracorporeal blood circuit (2), in which an electric current is made to flow along a closed-loop path (P1) of an electrical circuit (37) formed by an electrical line (21, 22, 23) external to the extracorporeal circuit (2), a portion of extracorporeal circuit (2) directly connected to the venous needle (13), and the patient (P); a signal correlated with the electric current along the electrical line (21, 22, 23) is detected; and the signal is compared with a threshold value by means of a control unit (15).
54 Citations
30 Claims
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1. A device for monitoring a cardiovascular access of a patient, comprising:
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an extracorporeal blood circuit having a venous branch connected to a cardiovascular access of a patient; an electrical line external to said extracorporeal blood circuit and having a first branch connected to said venous branch and a second branch connected to the patient either directly or through earth; a voltage source located between said first branch and said second branch; a sensor located in said first branch or in said second branch for supplying a signal corresponding to an electric current; and means for processing said signal to determine the state of said cardiovascular access. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of monitoring cardiovascular access of a patient during an extracorporeal blood treatment, comprising the steps of:
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providing an extracorporeal blood circuit having a venous branch connected to a cardiovascular access of a patient; providing an electrical line external to said extracorporeal blood circuit and having a first branch connected to said venous branch and a second branch connected to the patient either directly or through earth; providing a voltage source located between said first branch and said second branch, and a sensor located in said first branch or in said second branch for supplying a signal corresponding to an electric current; generating an electric current along a path of an electrical circuit comprising said electrical line and said cardiovascular access; sensing a signal corresponding to the electric current in said electrical line; and comparing said signal with a threshold value to determine the state of said cardiovascular access. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification