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A novel method for efficient drug delivery

C P Markou1, E M Lutostansky, D N Ku

  • 1Department of Medicine, School of Medicine, Emory University, Atlanta, GA 30322, USA.

Annals of Biomedical Engineering
|May 7, 1998
PubMed
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This study introduces a novel local drug delivery method for sustained high concentrations of anti-thrombotic and anti-restenotic agents. The technique effectively maintains therapeutic drug levels near the vessel wall, crucial for preventing thrombosis and vascular lesions.

Area of Science:

  • Biomedical Engineering
  • Pharmacology
  • Computational Fluid Dynamics

Background:

  • Systemic drug delivery faces challenges with agents having short half-lives or rapid degradation.
  • Achieving localized high drug concentrations is critical for effective treatment of thrombosis and restenosis.
  • Novel local drug delivery systems are needed to overcome limitations of systemic administration.

Purpose of the Study:

  • To describe the operating characteristics of a novel local drug delivery method.
  • To demonstrate the effectiveness of this method computationally and experimentally.
  • To evaluate the impact of infusion rate and flow conditions on drug concentration at the vessel wall.

Main Methods:

  • Computational modeling using the finite volume method to simulate drug concentration fields.

Related Experiment Videos

  • In vitro experiments using optical dye density measurements (Evans blue in saline).
  • Flow visualization studies in a steady flow system with physiologically relevant parameters.

    • Main Results:

    • Experimental studies confirmed high infusate concentrations near the vessel wall.
    • Computational models predicted clinically significant drug concentrations downstream of the infusion device.
    • High wall concentrations (>80% of infusate) were maintained at infusion rates >0.5% of main flow; therapeutic levels were sustained even at lower rates (<0.001Q).

    Conclusions:

    • The novel local drug delivery technique effectively sustains high drug concentrations at the vessel wall.
    • This method is promising for the inhibition of thrombosis and vascular lesion formation.
    • Drug concentration is dependent on flow conditions, infusion rate, and drug diffusivity.