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Related Experiment Videos

Precise microinjection into skin using hollow microneedles.

Ping M Wang1, Megan Cornwell, James Hill

  • 1School of Chemical and Biomolecular Engineering, Atlanta, Georgia, USA.

The Journal of Investigative Dermatology
|February 18, 2006
PubMed
Summary
This summary is machine-generated.

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Hollow microneedles enable precise, painless drug delivery into skin. Optimizing infusion flow involves partial needle retraction or vibration after insertion for effective transdermal drug delivery.

Area of Science:

  • Biomedical Engineering
  • Dermatology
  • Drug Delivery Systems

Background:

  • Hollow microneedles offer a painless alternative to hypodermic needles for transdermal drug delivery.
  • Limited research exists on effective methods for utilizing hollow microneedles in drug delivery applications.

Purpose of the Study:

  • To investigate and identify effective methods for using hollow microneedles for drug delivery into the skin.
  • To demonstrate precise control over injection depth within the epidermis or dermis.

Main Methods:

  • Hollow glass microneedles were inserted into hairless rat skin (in vivo) and human cadaver skin (in vitro).
  • Infusion of dye molecules, insulin, polymer microparticles, and cells was imaged using brightfield and fluorescence microscopy.
  • A rotary drilling device controlled needle penetration depth with +/-60 microm resolution.

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Main Results:

  • Precise microinjection into the epidermis or dermis was achieved using controlled needle insertion.
  • Partial needle retraction (100-300 microm) or vibration of the microneedle array significantly increased infusion flow rates.
  • Successful delivery of various molecules, microparticles, and cells into the skin was visualized.

Conclusions:

  • Hollow microneedles are effective for precise microinjection into skin.
  • Optimized infusion techniques, including partial retraction or vibration, enhance delivery efficiency.
  • This technology holds promise for painless and controlled transdermal drug delivery.