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01-10-2021 | Laser | Original Article

Endovenous laser coagulation: asymmetrical heat transfer (modeling in water)

Authors: Vladimir P. Minaev, Nikita V. Minaev, Vadim Yu. Bogachev, Konstantin A. Kaperiz, Vladimir I. Yusupov

Published in: Lasers in Medical Science | Issue 8/2021

Abstract

The objective of this study was to describe the dynamics of water heating carried out by continuous laser radiation with wavelengths 1.47, 1.55, and 1.94 μm with different types of fibers used for endovenous laser coagulation. The study was conducted in water using high-speed surveying of the heating process through the shadow optical method. It has been shown that in the case of highly water-absorbed laser radiations, convection and boiling play a major role in the process of heat transfer. It has been shown that in the case of radiation with λ = 1.94 μm that is heavily absorbed by water, effective heat transfer begins at significantly lower levels of power compared to the weaker-absorbed radiations with λ = 1.47 and 1.55 μm. Mathematical models based only on thermal conductivity inadequately describe the process of real heat transfer during endovenous laser coagulation. It has been established that heat transfer is sharply asymmetrical and is directed mainly up-and-forward (bare-tip fiber) or upward (“radial” and “two-ring” fibers). Heat transfer for laser light with wavelength 1.94 μm is most effective than for 1.47 and 1.55 μm.

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Title: Endovenous laser coagulation: asymmetrical heat transfer (modeling in water)
Authors: Vladimir P. Minaev
Nikita V. Minaev
Vadim Yu. Bogachev
Konstantin A. Kaperiz
Vladimir I. Yusupov
Publication date: 01-10-2021
Publisher: Springer London
Keyword: Laser
Published in: Lasers in Medical Science / Issue 8/2021
Print ISSN: 0268-8921
Electronic ISSN: 1435-604X
DOI: https://doi.org/10.1007/s10103-020-03184-y

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Endovenous laser coagulation: asymmetrical heat transfer (modeling in water)

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