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Temperature and pressure effects during erbium laser stapedotomy
1Institute of Applied Physics, University of Berne, Switzerland.
Lasers in Surgery and Medicine
|January 1, 1996
Summary
Erbium laser stapedotomy offers precise stapes foot plate perforation with minimal thermal damage (<10 microns). Safe clinical application is indicated for fluences under 10 J/cm2, making it ideal for middle ear surgery.
Area of Science:
- Otolaryngology
- Biomedical Engineering
- Laser Physics
Background:
- Laser-assisted stapedotomy is an alternative to mechanical drilling.
- Erbium lasers offer potential advantages in middle ear surgery.
Purpose of the Study:
- Quantify mechanical and thermal tissue effects of erbium laser stapedotomy.
- Determine optimal erbium laser parameters for safe clinical use.
Main Methods:
- Used an erbium laser (2.79 microns) on an inner ear model.
- Performed time-resolved pressure measurements and Schlieren photography.
- Examined laser-treated stapes foot plates using microscopy.
Main Results:
- Achieved precise stapes foot plate perforation with few laser pulses.
- Observed a thermal damage zone of less than 10 microns.
- Detected pressure transients from bone ablation and vapor channel collapse.
Conclusions:
- Erbium laser use is safe for fluences < 10 J/cm2, avoiding hearing defects.
- The erbium laser is a precise, safe, and efficient tool for middle ear surgery.