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A new approach for improving the availability of topically applied drugs by reducing the permeability of dermis has
been evaluated. The premise of this work is that photothermal vascular injury will reduce vascular uptake of drug in the
dermis. The dermal distribution of two topically applied drugs, 5-fluorouracil and mitomycin C, is calculated,
considering molecular diffusion and vascular uptake according to a distributed model, in the presence and absence of
vascular injury. Intradermal drug exposures obtained are compared to exposures known to be effective in killing tumor
cells. Combining the reduction in dermal permeability with fractional photothermal epidermal ablation to increase
epidermal permeability may allow higher drug concentrations to be achieved in the skin. A newly developed laser
handpiece for implementing the technique is described.
Kathleen McMillan
"Dual-effect laser handpiece for modification of tissue permeability", Proc. SPIE 7883, Photonic Therapeutics and Diagnostics VII, 78830W (17 February 2011); https://doi.org/10.1117/12.876326
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Kathleen McMillan, "Dual-effect laser handpiece for modification of tissue permeability," Proc. SPIE 7883, Photonic Therapeutics and Diagnostics VII, 78830W (17 February 2011); https://doi.org/10.1117/12.876326