Method of monitoring a vascular access and an apparatus for extracorporeal treatment of blood with a device for monitoring the vascular access
First Claim
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1. A system for extracorporeal blood treatment comprising:
- (a) an extracorporeal blood path comprising an arterial line in fluid communication with a first vascular access and an inlet to a blood treatment device, and a venous line in fluid communication with an outlet of the blood treatment device and with a second vascular access;
(b) an arterial fluid pressure sensor in communication with the arterial line and constructed and arranged for measuring pressure within the arterial line;
(c) a venous fluid pressure sensor in communication with the venous line and constructed and arranged for measuring pressure within the venous line;
(d) a computer unit connected to the arterial and venous pressure sensors, which is constructed and arranged for generating first and second characteristic values for the integrity of the vascular access from measured arterial and venous pressures;
(e) an analyzer unit constructed and arranged for analyzing the integrity of the vascular access by comparing the first and second characteristic values to first and second ranges of predetermined values.
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Abstract
A method and device for monitoring a vascular access during a dialysis treatment in which the pressures in both the arterial and venous branches of the extracorporeal blood system are monitored by pressure sensors. Characteristic values for the condition of the vascular access are calculated in a computer unit from the pressures in the arterial and venous branches of the extracorporeal system, and these values are analyzed in an analyzer unit to detect a defective vascular access.
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Citations
14 Claims
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1. A system for extracorporeal blood treatment comprising:
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(a) an extracorporeal blood path comprising an arterial line in fluid communication with a first vascular access and an inlet to a blood treatment device, and a venous line in fluid communication with an outlet of the blood treatment device and with a second vascular access;
(b) an arterial fluid pressure sensor in communication with the arterial line and constructed and arranged for measuring pressure within the arterial line;
(c) a venous fluid pressure sensor in communication with the venous line and constructed and arranged for measuring pressure within the venous line;
(d) a computer unit connected to the arterial and venous pressure sensors, which is constructed and arranged for generating first and second characteristic values for the integrity of the vascular access from measured arterial and venous pressures;
(e) an analyzer unit constructed and arranged for analyzing the integrity of the vascular access by comparing the first and second characteristic values to first and second ranges of predetermined values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
(i) a first characteristic value below the first range of values, and a second characteristic value below the second range of values, and (ii) a first characteristic value above the first range of values, and a second characteristic value above the second range of values.
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7. The system of claim 6, wherein the smallest value in the first range of predetermined characteristic values (M1) is less than the smallest value in the second range of predetermined characteristic values (M2).
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8. The system of claim 7, wherein M1 is −
- 15 mmHg and M2 is −
10 mmHg.
- 15 mmHg and M2 is −
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9. The system of claim 6, wherein the predetermined number of successive measurements is greater than a product of the frequency of arterial and venous pressure measurement and a value for the attenuation of the arterial and venous pressure sensors.
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10. The method of claim 7, wherein the safe response is an alarm selected from the group consisting of visual and audible alarms.
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11. The method of claim 7, wherein the safe response comprises closing a cutoff clamp in the venous line.
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12. The method of claim 7, wherein the safe response comprises interrupting the provision of blood to the extracorporeal blood path.
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13. The method of claim 7, wherein the safe response comprises stopping a blood pump provided in the arterial line.
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14. The system of claim 2, wherein the system is incorporated into a dialysis machine.
Specification