Mr. Donald Burks Profile

Donald Burks

at Univ of North Carolina at Charlotte

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Proceedings Article | 9 February 2012 Paper

Selective laser vaporization of polypropylene sutures and mesh

David Burks, Sarah Rosenbury, Michael Kennelly, Nathaniel Fried

Proceedings Volume 8207, 820710 (2012) https://doi.org/10.1117/12.905644

KEYWORDS: Laser tissue interaction, Tissues, Semiconductor lasers, Laser ablation, Pulsed laser operation, Absorption, Cameras, Laser therapeutics, Laser irradiation, Fiber lasers

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Complications from polypropylene mesh after surgery for female stress urinary incontinence (SUI) may require tedious surgical revision and removal of mesh materials with risk of damage to healthy adjacent tissue. This study explores selective laser vaporization of polypropylene suture/mesh materials commonly used in SUI. A compact, 7 Watt, 647-nm, red diode laser was operated with a radiant exposure of 81 J/cm², pulse duration of 100 ms, and 1.0-mm-diameter laser spot. The 647-nm wavelength was selected because its absorption by water, hemoglobin, and other major tissue chromophores is low, while polypropylene absorption is high. Laser vaporization of ~200-μm-diameter polypropylene suture/mesh strands, in contact with fresh urinary tissue samples, ex vivo, was performed. Non-contact temperature mapping of the suture/mesh samples with a thermal camera was also conducted. Photoselective vaporization of polypropylene suture and mesh using a single laser pulse was achieved with peak temperatures of 180 and 232 °C, respectively. In control (safety) studies, direct laser irradiation of tissue alone resulted in only a 1 °C temperature increase. Selective laser vaporization of polypropylene suture/mesh materials is feasible without significant thermal damage to tissue. This technique may be useful for SUI procedures requiring surgical revision.

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