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Proceedings Paper

Photoacoustic drug delivery: the effect of laser parameters on the spatial distribution of delivered drug
Author(s): HanQun Shangguan; Lee W. Casperson; Alan Shearin; Kenton W. Gregory; Scott A. Prahl
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Paper Abstract

Photoacoustic drug delivery is a technique for delivering drugs to localized areas by timing laser-induced pressure transients to coincide with a bolus of drug. This study explores the effects of target material, laser energy, absorption coefficient, fiber size, repetition rate, and number of pulses on the spatial distribution of delivered drug. A microsecond flash-lamp pumped dye laser delivered 30-100 mJ pulses through optical fibers with diameters of 300-1000 micrometers . Vapor bubbles were created 1-5 mm above clear gelatin targets submerged in mineral oil containing a hydrophobic dye (D&C Red#17). The absorption coefficient of the oil-dye solution was varied from 50-300 cm-1. Spatially unconfined geometry was investigated. We have found that while the dye can be driven a few millimeters into the gels in both the axial and radial directions, the penetration was less than 500 micrometers when the gel surface remained macroscopically undamaged. Increasing the distance between the fiber tip and target, or decreasing the pulse energy reduced the extend of the delivery.

Paper Details

Date Published: 22 May 1995
PDF: 9 pages
Proc. SPIE 2391, Laser-Tissue Interaction VI, (22 May 1995); doi: 10.1117/12.209907
Show Author Affiliations
HanQun Shangguan, Portland State Univ. and Oregon Medical Laser Center (United States)
Lee W. Casperson, Portland State Univ. (United States)
Alan Shearin, Oregon Medical Laser Center and Palomar Medical Technologies, Inc. (United States)
Kenton W. Gregory, Oregon Medical Laser Center and Oregon Health Sciences Univ. (United States)
Scott A. Prahl, Oregon Medical Laser Center, Oregon Graduate Institute, and Oregon Health Sciences Univ. (United States)

Published in SPIE Proceedings Vol. 2391:
Laser-Tissue Interaction VI
Steven L. Jacques, Editor(s)

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