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Model for indirect laser surgery.

Natalia Sapogova¹, Vladimir Bredikhin¹, Nikita Bityurin¹

¹Institute of Applied Physics of the Russian Academy of Science, Federal State Budgetary Institution of Science, 46 Ulyanova Street, Nizhny Novgorod, 603950, Russia.

Biomedical Optics Express

|January 20, 2017

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This study models laser cutting of biological tissue using a heated fiber tip. Results show cutting speed and depth depend significantly on scalpel angle, especially when light scattering is high.

Area of Science:

Biomedical Engineering
Optical Physics
Materials Science

Background:

Laser-based surgical tools offer precision but require optimization for biological tissue interaction.
Understanding light-tissue interaction, including scattering and absorption, is crucial for effective laser cutting.
Heated fiber tips with absorbing coatings present a novel approach for laser tissue ablation.

Purpose of the Study:

To develop a theoretical model for laser cutting of biological tissue using a heated fiber tip with an absorbing coating.
To investigate the influence of the scalpel's inclination angle on cutting speed and depth.
To experimentally validate the theoretical model and explore methods for enhancing cutting efficiency.

Main Methods:

A theoretical model was developed to simulate laser-tissue interaction.

Keywords:

(140.6810) Thermal effects (170.0170) Medical optics and biotechnology (170.1020) Ablation of tissue

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Experiments were conducted using a silica fiber with a carbon and silicon organic varnish coating.

A 0.97-µm wavelength laser was used to cut porcine skin samples.

Main Results:

The study demonstrated a significant dependence of cutting speed and depth on the scalpel's inclination angle.
This effect was particularly pronounced when light scattering in the tissue exceeded absorption.
Experimental results validated the theoretical model's predictions.

Conclusions:

The inclination angle of the laser scalpel is a critical parameter for optimizing laser cutting of biological tissues.
The theoretical model provides valuable insights into laser-tissue interaction dynamics.
Deposition of an absorbing layer on the tissue surface can potentially increase cutting efficiency.