4.7 Article

Dynamics characteristics of a laser-induced non-spherical bubble collapsing micro-jet and its enhancement on hard tissue ablation

Journal

OPTICS AND LASERS IN ENGINEERING
Volume 151, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2021.106893

Keywords

Laser cavitation; Non-spherical bubble collapse; Micro-jet impact; Tissue ablation; Mechanical effect

Categories

Funding

  1. Beijing Natural Science Foundation [3214041]
  2. Scientific Research Key Program of Beijing Municipal Commission of Education [KZ202110005012]
  3. National Natural Science Foundation of China [51975017]

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Experimental results show that the geometrical characteristics of the incubation crater ablated in the bone are closely related to the micro-jet vector. The crater depth and diameter are positively dependent on the micro-jet velocity and micro-jet diameter, while crater's diameter-to-depth ratio is negatively correlated with the microjet velocity. The corresponding micro-jet impact strength on the bone tissue is about 85.2-123.5 MPa, with the micro-jet velocity ranging from 24 m/s to 35 m/s, and the impact pressure decreases rapidly along the central axis outward, resulting in the U-shaped ablation crater.
Liquid-assisted laser ablation has been investigated in osteotomy and dentistry with the aim of removing tissue while minimizing thermal injury. In this paper, the dynamics of a laser-induced non-spherical bubble collapsing micro-jet vector as well as its scaling relationship with the output tissue ablation are described. The velocities of the micro-jets with normalized stand-off distances (gamma) from 0.1 to 0.7 are determined in the range of 24-35 m/s, while the corresponding crater depths are in the range of 260-1020 mu m with a diameter-to-depth ratio of 0.7 to 1.9. The results show that the geometrical characteristics of the incubation crater ablated in the bone are closely related to the micro-jet vector. The crater depth and diameter are positively dependent on the micro-jet velocity and micro-jet diameter, while crater's diameter-to-depth ratio is negatively correlated with the microjet velocity. The corresponding micro-jet impact strength on the bone tissue is about 85.2-123.5 MPa, with the micro-jet velocity ranging from 24 m/s to 35 m/s, and the impact pressure decreases rapidly along the central axis outward, resulting in the U-shaped ablation crater. The results show that adjusting gamma is an effective method for controlling the micro-jet vector and the resultant bone ablation.

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