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Ultrashort pulse laser ossicular ablation and stapedotomy in cadaveric bone
William B Armstrong1, Joseph A Neev, Luiz B Da Silva
1Department of Otolaryngology-Head and Neck Surgery, University of California, Irvine, Orange, CA 92868, USA.
Lasers in Surgery and Medicine
|March 14, 2002
Summary
Ultrashort pulse laser ablation precisely removed ossicular tissue in cadaver bone with minimal thermal damage. This technology shows promise for otologic surgery requiring delicate hard tissue removal near critical structures.
Area of Science:
- Otolaryngology
- Surgical Technology
- Biomedical Optics
Background:
- Precise ablation of ossicular and skull base tissues is critical in otologic surgery.
- Existing surgical methods may pose risks of thermal or mechanical damage to adjacent delicate structures.
Purpose of the Study:
- To evaluate the efficacy of a 1,053 nm Ti:Sapphire chirped pulse amplifier laser system for ablating ossicular tissue.
- To assess the precision and potential for collateral damage during ultrashort pulse laser ablation of bone.
Main Methods:
- Formalin-fixed incus and stapes from cadaver temporal bones were ablated using an ultrashort pulse laser (USPL).
- The laser system delivered pulses of 350 femtoseconds at a wavelength of 1,053 nm, with a 0.4 mm beam diameter, 2.0 J/cm2 fluence, and 10 Hz repetition rate.
- Ablation rate was quantified via optical micrometry, and crater morphology was analyzed using scanning electron microscopy.
Main Results:
- The USPL system achieved precise bone ablation at a rate of 1.26 micrometers per pulse.
- Minimal thermal damage and negligible photomechanical injury were observed on the ablated surfaces.
- The laser demonstrated high precision in hard tissue removal.
Conclusions:
- Ultrashort pulse laser ablation offers a highly precise method for removing ossicular and other hard tissues.
- This laser technology presents a potential advancement for otologic and skull base surgeries, enabling precise tissue ablation adjacent to critical anatomical structures.
- The minimal collateral damage observed suggests a favorable safety profile for clinical application.