Method for measuring the concentration of substances in living organisms using microdialysis and a device for carrying out said method
First Claim
1. Method for measuring the concentration of substances in living organisms using microdialysis, wherein bodily fluid is mixed with a perfusate and passed through a membrane, and a substance concentration of the bodily fluid is determined using a sensor unit, characterized in that in order to take into consideration the restricted transport of the substance through the membrane, so that the measured substance concentration differs from the actual substance concentration in the organism, an endogenous substance used as a reference substance, having a known value, is measured after passing through the membrane and mixing with the perfusate, and the actual substance concentration is determined on the basis of the quotient of the known reference substance value divided by the measured reference substance value, multiplied by the measured substance concentration.
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Abstract
The invention relates to a method for measuring the concentration of substances in living organisms using microdialysis, whereby bodily fluid is mixed with a perfusate and passed through a membrane and a substance value is determined for the bodily fluid with the aid of a sensor unit. According to the invention, to allow for the limited transport through the membrane, so that the measured substance value differs from the actual substance value in the organism, a reference substance present in said organism with a known value is also measured after passing through the membrane and mixing with the perfusate and the actual substance value is determined, based on the quotient from the known reference substance value divided by the measured reference substance value, multiplied by the measured substance value.
57 Citations
12 Claims
- 1. Method for measuring the concentration of substances in living organisms using microdialysis, wherein bodily fluid is mixed with a perfusate and passed through a membrane, and a substance concentration of the bodily fluid is determined using a sensor unit, characterized in that in order to take into consideration the restricted transport of the substance through the membrane, so that the measured substance concentration differs from the actual substance concentration in the organism, an endogenous substance used as a reference substance, having a known value, is measured after passing through the membrane and mixing with the perfusate, and the actual substance concentration is determined on the basis of the quotient of the known reference substance value divided by the measured reference substance value, multiplied by the measured substance concentration.
- 7. Device for measuring the concentration of substances in living organisms using microdialysis, having a microdialysis catheter that has a membrane, through which bodily fluid is mixed with a perfusate that is supplied from a perfusate reservoir, and having a sensor unit for determining the substance concentration of the bodily fluid, characterized in that the membrane is also set up for passage of an endogenous substance used as a reference substance, having a known value, and this reference substance is measured after passing through the membrane and mixing with the perfusate, using the sensor unit, and that the sensor unit is connected with an electronic evaluation unit, which is set up to determine the actual substance concentration on the basis of the quotient of the known reference substance value divided by the measured reference substance value, multiplied by the measured substance concentration.
Specification