Optimization of laser parameters for ultrashort-laser spinal surgeries

Biswajit Mishra; Liam Andrus; Aditya Roy; Adela Ben-Yakar

doi:10.1117/12.2650552

17 March 2023 Optimization of laser parameters for ultrashort-laser spinal surgeries

Biswajit Mishra, Liam Andrus, Aditya Roy, Adela Ben-Yakar

Author Affiliations +

Proceedings Volume 12411, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXIII; 1241105 (2023) https://doi.org/10.1117/12.2650552
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

Ultrafast laser ablation supersedes conventional surgical techniques in terms of precision and thermal load generation. However, the main limiting criterion of the application of laser ablation techniques to surgeries has been the low material removal rate (MRR). In efforts to bridge the gap, a benchtop fiber-baser laser delivery system has been developed which demonstrated a MRR increase of ~15 times over the previously reported fs-laser surgical probes. The benchtop optical setup incorporates a hollow-core Kagome fiber (NA≈0.02) delivering high-power laser pulses from the Yb-doped fiber laser (λ=1035 nm) source to the sample. A Lissajous-based beam steering mechanism was employed to distribute the ultrashort laser pulses on the sample. The overall transmission efficiency of the system was 59%, with none of the components exhibiting any non-linear behavior at high peak intensities. For a FOV scan width of 250 μm, the logarithmic relationship between the ablation depth and laser fluence was determined for two different translational velocities. The system achieved material removal rates of ~2 mm³/min for the maximum applied laser fluence of 18.9 J/cm², without initiating carbonization. Additionally, optimized laser parameters were implemented to achieve a clean-cut trench of 3 x 0.8 μm² size and ~1.22 mm deep in under 3 minutes of laser exposure, which is within the surgical time bounds of a conventional spinal decompression technique. The fact that the trench is devoid of any carbonized section or unhealthy tissue, and was created without any irrigation setting only increases the reliability and viability of the ultrashort-laser ablation technique in surgical applications.

Conference Presentation

Citation Download Citation

Biswajit Mishra, Liam Andrus, Aditya Roy, and Adela Ben-Yakar "Optimization of laser parameters for ultrashort-laser spinal surgeries", Proc. SPIE 12411, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXIII, 1241105 (17 March 2023); https://doi.org/10.1117/12.2650552

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