Device for setting up a dilution measurement site
First Claim
1. Device for setting up a dilution measurement site on a hemodialyzer, which has the following:
- an arterial connection piece, having a hemodialyzer input connector,at least one of a sensor for measuring the temperature of blood to be dialyzed and a sensor for measuring an indicator concentration in blood to be dialyzed, as well asa venous connection piece, having a hemodialyzer output connector and an injection channel for injecting a bolus into dialyzed blood that flows through the venous connection piece.
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Accused Products
Abstract
The device according to the invention serves to set up a dilution measurement site on a hemodialyzer. Using such a measurement site, it is possible to determine the filling status of a dialysis patient during dialysis treatment, by means of dilution measurements. Checking the fluid balance by means of weighing the dialysis patient, which is subject to error, can be eliminated. The arterial connection piece is connected with an arterial fistula needle, and the venous connection piece is connected with a venous fistula needle as the blood vessel access. The venous connection piece has an injection channel through which a bolus required to perform a dilution measurement can be injected into the blood, which flows through the venous connection piece coming from the hemodialyzer, in the direction of the venous blood vessel access. The arterial connection piece has a temperature sensor by means of which the temperature of the blood, which flows through the venous connection piece coming from the arterial blood vessel access, in the direction of the hemodialyzer, can be measured. The system response to the disruption caused in the bloodstream of the dialysis patient by means of the bolus injection can be determined by way of this temperature measurement, and the bloodstream filling status can be determined from this.
36 Citations
30 Claims
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1. Device for setting up a dilution measurement site on a hemodialyzer, which has the following:
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an arterial connection piece, having a hemodialyzer input connector, at least one of a sensor for measuring the temperature of blood to be dialyzed and a sensor for measuring an indicator concentration in blood to be dialyzed, as well as a venous connection piece, having a hemodialyzer output connector and an injection channel for injecting a bolus into dialyzed blood that flows through the venous connection piece. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. Method of setting up a dilution measurement site on a hemodialyzer, said method including the steps of
connecting an arterial connection piece to a hemodialyzer input, connecting said arterial connection piece to an arterial blood vessel access, installing at least one of a sensor for measuring the temperature of blood to be dialyzed and a sensor for measuring an indicator concentration in blood to be dialyzed, connecting a venous connection piece, having an injection channel for injecting a bolus into dialyzed blood that flows through the venous connection piece, to a hemodialyzer output, and connecting said venous connection piece to a venous blood vessel access.
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29. Method of carrying out thermodilution measurements on the cardiovascular system of a dialysis patient, said method including the steps of
setting up a dilution measurement site on a hemodialyzer by connecting an arterial connection piece to a hemodialyzer input, connecting said arterial connection piece to an arterial blood vessel access, installing a sensor for measuring the temperature of blood to be dialyzed, connecting a venous connection piece, having an injection channel for injecting a bolus into dialyzed blood that flows through the venous connection piece, to a hemodialyzer output, and connecting said venous connection piece to a venous blood vessel access, injecting said bolus into said dialyzed blood through said injection channel, wherein said bolus has a temperature different from said dialyzed blood, acquiring at least one variable characterizing said bolus injection, said at least one variable including at least one of temperature of said bolus injected, amount of said bolus injected and duration of said injection of said bolus, measuring, using said sensor, the temperature of the blood to be dialyzed over time, evaluating a transpulmonary diffusion measurement, in that at least one hemodynamic parameter is determined proceeding from the measured temperature of the blood to be dialyzed over time and the at least one variable characterizing said bolus injection.
Specification