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The glucose sensor: the missing link in diabetes therapy.

E F Pfeiffer1

  • 1Abteilung Innere Medizin I, Universität Ulm, Germany.

Hormone and Metabolic Research. Supplement Series
|January 1, 1990
PubMed
Summary

Implantable glucose sensors show promise for diabetes management but face challenges. Animal studies show short-term reliability, while human trials reveal rapid degradation due to foreign-body reactions, limiting continuous glucose monitoring.

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Area of Science:

  • Biomedical Engineering
  • Medical Devices
  • Analytical Chemistry

Background:

  • Amperometric enzymatic glucose sensors are widely used in laboratories for reliable glucose determination in solution.
  • Existing implantable glucose sensor technology faces significant challenges with in vivo performance and longevity.
  • Foreign-body reactions and sensor encapsulation limit the duration of accurate glucose readings in subcutaneous tissue.

Purpose of the Study:

  • To review the current state of implantable glucose sensor technology and its practical applications.
  • To analyze the chemical and technical aspects of glucose sensors under in vitro and in vivo conditions.
  • To evaluate the potential of portable continuous glucose monitoring systems for diabetes management.

Main Methods:

  • Review of technical models and practical experiences with implantable glucose sensors.
  • Analysis of in vitro and in vivo data from animal and human studies.
  • Evaluation of a proprietary sensor in a flow-through chamber for continuous blood glucose monitoring.

Main Results:

  • In vitro studies show satisfactory glucose determination, but in vivo animal studies demonstrate sensor encapsulation and limited reliability (up to 4 days).
  • Human trials show even poorer results, with decreasing sensor activity observed in less than 24 hours.
  • A proprietary portable sensor, when used with insulin pumps, showed potential for modified subcutaneous insulin application algorithms.

Conclusions:

  • Current implantable glucose sensors face significant limitations due to foreign-body reactions, hindering long-term continuous monitoring.
  • Portable continuous glucose monitoring instruments are essential for evaluating different diabetes treatment strategies.
  • Further development is needed to overcome biological barriers and improve the longevity and accuracy of implantable glucose sensors.

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