Process for using a measuring cell assembly for glucose determination
First Claim
1. A process for continuously or intermittently determining the glucose concentration in subcutaneous tissue, which comprises using an enzymatic oxidation of glucose by oxygen in the presence of the enzyme glucose oxidase and determining the used amount of oxygen by means of a measuring cell, characterized in that a perfusion fluid which contains dissolved glucose oxidase, is passed continuously or intermittently at a constant rate via a supply tube through a hollow fiber provided in the subcutaneous tissue and permeable to glucose and is passed via an airtight discharge tube from the hollow fiber to a measuring cell provided outside the body, with a dialysis taking place subcutaneously whereby glucose passes via the wall of the hollow fiber from the tissue into the perfusion fluid in an amount proportional to the locally prevailing glucose concentration, and with the glucose received in the perfusion fluid being completely oxidized before reaching the measuring cell.
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Accused Products
Abstract
A wearable-type glucose sensor for continuously or intermittently determining the glucose content comprises a short hollow fiber (2) to be positioned in the subcutaneous tissue. This hollow fiber is connected via tubes (3,4) with component parts (5 . . . 12) located outside the body, such as a measuring unit (11). When a perfusion fluid containing the enzyme glucose oxidase is passed through the hollow fiber, a subcutaneous dialysis will take place in which some glucose dissolves in the perfusion fluid through the wall of the hollow fiber. This glucose is completely oxidized by the oxygen dissolved in the perfusion fluid in the presence of the glucose oxidase. By means of the measuring unit the resultant amount of H2 O2 or, preferably, the employed amount of O2 is determined, both of which are a measure of the subcutaneous glucose concentration.
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4 Claims
- 1. A process for continuously or intermittently determining the glucose concentration in subcutaneous tissue, which comprises using an enzymatic oxidation of glucose by oxygen in the presence of the enzyme glucose oxidase and determining the used amount of oxygen by means of a measuring cell, characterized in that a perfusion fluid which contains dissolved glucose oxidase, is passed continuously or intermittently at a constant rate via a supply tube through a hollow fiber provided in the subcutaneous tissue and permeable to glucose and is passed via an airtight discharge tube from the hollow fiber to a measuring cell provided outside the body, with a dialysis taking place subcutaneously whereby glucose passes via the wall of the hollow fiber from the tissue into the perfusion fluid in an amount proportional to the locally prevailing glucose concentration, and with the glucose received in the perfusion fluid being completely oxidized before reaching the measuring cell.
Specification