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Related Experiment Videos

A piezoelectric driven controlled release micropump for insulin delivery.

P K Watler1, M V Sefton

  • 1Department of Chemical Engineering and Applied Chemistry, University of Toronto, Ontario.

ASAIO Transactions
|April 1, 1990
PubMed
Summary

A novel piezoelectric device enhances insulin transport across membranes, improving delivery rates for diabetics. This technology shows potential for better matching insulin supply with demand.

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Area of Science:

  • Biomedical Engineering
  • Materials Science

Background:

  • Insulin delivery for diabetes management requires precise control to match physiological demand.
  • Existing methods often struggle with dynamic adjustments, leading to suboptimal glycemic control.

Purpose of the Study:

  • To investigate the use of a piezoelectric disk bender to actively augment insulin transport across a membrane.
  • To evaluate the factors influencing augmented insulin flow and its potential for improved insulin delivery systems.

Main Methods:

  • A piezoelectric disk bender was employed to create pressure-driven flow across a membrane, supplementing basal diffusion.
  • Insulin transport augmentation was measured under varying voltages, frequencies, membrane properties, and reservoir sizes.
  • Theoretric calculations using an equivalent circuit model were performed to correlate pressure changes with augmented flow.

Main Results:

  • Piezoelectric augmentation significantly increased insulin transport rates, particularly at voltages >50 V DC and frequencies near resonance.
  • Augmentation efficiency was influenced by membrane permeability, hydraulic to diffusive permeability ratio, and insulin reservoir volume.
  • Theoretric analysis indicated that a small pressure increase (0.19%) in the insulin reservoir accounted for ~95% of the augmented flow.

Conclusions:

  • Piezoelectric-actuated membrane transport offers a promising method for enhancing insulin delivery.
  • The device's performance is tunable via electrical parameters and membrane characteristics.
  • Further optimization is needed, but the technology holds potential for advanced artificial pancreas systems.

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