Peculiarities of soft biological tissue perforation induced by near infrared laser radiation with optic fiber delivery

Q3 Physics and Astronomy Journal of Biomedical Photonics and Engineering Pub Date : 2018-09-12 DOI:10.18287/JBPE18.04.030301

A. Dmitriev, A. Konovalov, V. Kortunov, V. A. Ul’yanov

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Abstract

. The authors studied the process of perforation of soft biological tissue by continuous near infrared lasers (0.98 µm, 1.56 µm and 1.94 µm) with optic fiber delivery. Fiber drag force (FDF) during perforation of soft biological tissue was studied. Specific characteristics of laser radiation heat impact on the tissues surrounding the laser channel were examined. Three perforation modes were observed: mechanical perforation mode, intense evaporation and tissue destruction mode, “free” perforation mode. In the first mode, FDF is almost identical to FDF in the absence of radiation. In the second mode, FDF is significantly lower than FDF during laser radiation power of P = 0. In the third perforation mode, the formed channel becomes wider than the fiber diameter due to intense tissue evaporation and burning, and FDF is close to or below the sensitivity limit of the force sensor. The effect of burnt tissue deposit at the fiber tip on the laser perforation process was studied. © 2018 Journal of Biomedical Photonics & Engineering. the a

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光纤传输近红外激光辐射诱发软组织穿孔的特点

。作者研究了连续近红外激光（0.98µm、1.56µm和1.94µm）和光纤输送对软生物组织穿孔的过程。研究了生物软组织穿孔过程中的纤维阻力。研究了激光辐射热对激光通道周围组织的影响的具体特征。观察到三种穿孔模式：机械穿孔模式、强烈蒸发和组织破坏模式、“自由”穿孔模式。在第一种模式中，在没有辐射的情况下，FDF几乎与FDF相同。在第二模式中，在P＝0的激光辐射功率期间，FDF显著低于FDF。在第三穿孔模式中，由于强烈的组织蒸发和燃烧，形成的通道变得比纤维直径更宽，并且FDF接近或低于力传感器的灵敏度极限。研究了纤维尖端烧伤组织沉积对激光穿孔过程的影响。©2018生物医学光子与工程杂志。a

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