Method for determining the concentration of glucose in a body fluid with glucose-containing perfusate
First Claim
1. A method for determining a glucose concentration in a body fluid with glucose-containing perfusate, the method comprising the steps of:
- providing a microdialysis probe, a measuring cell having a sensor, and a control device, inserting the microdialysis probe into the body fluid, passing the perfusate having a pre-determined starting content of glucose through the microdialysis probe to obtain a dialysate, transporting the dialysate to the measuring cell, obtaining with the sensor measurement signals from the dialysate, the dialysate serving as an electrolyte and being used to continuously register a measuring current, which correlates with a glucose content of the dialysate in the measuring cell, determining from the measurement signals a base line value corresponding to a starting concentration of glucose in the perfusate and the existence of a peak value, the peak value being present when there are differences in concentration between the starting concentration of glucose in the perfusate and the concentration of glucose in the body fluid, adjusting the starting content of glucose in the perfusate to a glucose content of the body fluid with the control device in accordance with a command variable corresponding with the glucose concentration of the body fluid and being derived from the measurement signals of the measuring cell, wherein the glucose concentration in the body fluid is determined by either using a momentary content of glucose in the perfusate as a measure for the glucose content of the body fluid when a deviation between the peak value and the base line value is negligible or by determining the glucose content of the body fluid directly from the obtained measurement signals.
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Abstract
The invention concerns a method and an arrangement for determining the concentration of glucose in a body fluid. In the microdialysis technology used for this purpose, perfusate containing glucose is transported in intermittent delivery pulses through a microdialysis probe (10) inserted into the body fluid and dialysate obtained in this process is passed to a measuring cell (16) to record the glucose content. In order to achieve an exact determination of glucose even with a reduced dialysis period, it is proposed that the starting content of glucose in the perfusate is adapted to the glucose content of the body fluid by means of a control device (18, 20) in accordance with a command variable derived from the measurement signals of the measuring cell (16). When the control deviation is negligible the momentary starting content of glucose in the perfusate can be determined as a measure for the glucose content of the body fluid.
273 Citations
48 Claims
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1. A method for determining a glucose concentration in a body fluid with glucose-containing perfusate, the method comprising the steps of:
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providing a microdialysis probe, a measuring cell having a sensor, and a control device, inserting the microdialysis probe into the body fluid, passing the perfusate having a pre-determined starting content of glucose through the microdialysis probe to obtain a dialysate, transporting the dialysate to the measuring cell, obtaining with the sensor measurement signals from the dialysate, the dialysate serving as an electrolyte and being used to continuously register a measuring current, which correlates with a glucose content of the dialysate in the measuring cell, determining from the measurement signals a base line value corresponding to a starting concentration of glucose in the perfusate and the existence of a peak value, the peak value being present when there are differences in concentration between the starting concentration of glucose in the perfusate and the concentration of glucose in the body fluid, adjusting the starting content of glucose in the perfusate to a glucose content of the body fluid with the control device in accordance with a command variable corresponding with the glucose concentration of the body fluid and being derived from the measurement signals of the measuring cell, wherein the glucose concentration in the body fluid is determined by either using a momentary content of glucose in the perfusate as a measure for the glucose content of the body fluid when a deviation between the peak value and the base line value is negligible or by determining the glucose content of the body fluid directly from the obtained measurement signals. - 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, 27, 28)
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29. A method for determining a glucose concentration in a body fluid with glucose-containing perfusate, the method comprising the steps of:
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providing a microdialysis probe, a measuring cell having a sensor, and a control device, inserting the microdialysis probe into the body fluid, passing the perfusate having a pre-determined starting content of glucose through the microdialysis probe at different flow rates to obtain a dialysate, transporting the dialysate to the measuring cell, obtaining with the sensor measurement signals from the dialysate, the dialysate serving as an electrolyte and being used to continuously register as a measuring current, which correlates with a glucose content of the dialysate in the measuring cell, determining from the measurement signals a base line value corresponding to a starting concentration of glucose in the perfusate and the existence of a peak value, the peak value being present when there are differences in concentration between the starting concentration of glucose in the perfusate and the concentration of glucose in the body fluid, and adjusting the starting content of glucose in the perfusate to a glucose content of the body fluid with the control device in accordance with a command variable corresponding with the glucose concentration of the body fluid and begins derived from the measurement signals of the measuring cell, wherein the glucose concentration in the body fluid is determined by either using a momentary content of glucose in the perfusate as a measure for the glucose content of the body fluid when a deviation between the peak value and the base line value is negligible or by determining the glucose content of the body fluid directly from the obtained measurement signals. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A method for determining a glucose concentration in a body fluid with glucose-containing perfusate, the method comprising the steps of:
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providing a microdialysis probe, a measuring cell having a sensor, and a control device, inserting the microdialysis probe into the body fluid, passing the perfusate having a pre-determined starting content of glucose through the microdialysis probe to obtain a dialysate, transporting the dialysate to the measuring cell, obtaining with the sensor measurement signals from the dialysate, the dialysate serving as an electrolyte and being used to continuously register a measuring current, which correlates with a glucose content of the dialysate in the measuring cell, and adjusting the starting content of glucose in the perfusate to a glucose content of the body fluid with the control device in accordance with a command variable corresponding with the glucose concentration of the body fluid and being derived from the measurement signals of the measuring cell, wherein the glucose concentration in the body fluid is determined by either using a momentary content of glucose in the perfusate as a measure for the glucose content of the body fluid or by determining the glucose content of the body fluid directly from the obtained measurement signals. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48)
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Specification