Transdermal drug delivery with a pressure wave.

Area of Science:

• Biophysics
• Dermatology
• Drug Delivery

Background:

• Stratum corneum (SC) presents a significant barrier to transdermal drug delivery.
• Intense laser radiation generates unique pressure waves distinct from ultrasound or cavitation.
• Understanding pressure wave interactions with biological tissues is crucial for novel therapeutic applications.

Purpose of the Study:

• To investigate the potential of laser-induced pressure waves for permeabilizing the stratum corneum and cell membranes.
• To characterize the effects of pressure waves on tissue and evaluate their suitability for drug transport.
• To demonstrate the feasibility of systemic drug delivery using pressure wave technology.

Main Methods:

• Generation of high-amplitude, nanosecond-duration pressure waves using intense laser radiation.
• Application of pressure waves to skin models to assess stratum corneum and cell membrane permeabilization.
• In vivo administration of insulin via pressure wave-mediated delivery to evaluate systemic effects.

Main Results:

• A single pressure wave application was sufficient to permeabilize the SC, allowing macromolecule transport into the epidermis and dermis.
• Delivered drugs, such as insulin, successfully entered the vasculature, producing a sustained systemic effect (e.g., reduced blood glucose).
• Pressure wave application was found to be painless, and the SC barrier function consistently recovered post-treatment.

Conclusions:

• Laser-induced pressure waves offer a non-invasive method for enhancing transdermal drug delivery.
• This technology facilitates the transport of macromolecules and achieves systemic drug effects without compromising skin integrity.
• Pressure wave technology holds promise for painless and effective drug delivery systems with reliable barrier recovery.