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Proceedings Paper

Use of 3-um laser radiation in middle ear surgery
Author(s): Hans Surya Pratisto; Martin Frenz; Michael Ith; Hans Joerg Altermatt; Heinz P. Weber
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Paper Abstract

An inner ear model was used to demonstrate thermal and mechanical effects occurring during Erbium laser stapedotomy. Results of inverse schlieren optical flash photography and time resolved pressure amplitude measurements indicate the existence of safe laser parameters for stapes foot plate perforation. Due to the high absorption of 3 micrometers radiation in water, efficient bone ablation and precise fenestration with small thermally damaged zones is achieved. Pressure transients caused by the explosive ablation process correlate with the spiking of the laser intensity. The energy of a laser pulse, directly applied into the perilymph through an already existing perforation, creates a vapor channel which afterwards collapses, sending out a strong pressure transient. The maximal amplitude of this pressure transient depends on the geometry and dynamics of the vapor channel and is several times stronger than the pressure amplitudes generated by the bone ablation process. This study shows that no permanent hearing loss or damage of inner ear structures is expected using an Erbium laser fluence of 10 J/cm2.

Paper Details

Date Published: 18 January 1995
PDF: 6 pages
Proc. SPIE 2323, Laser Interaction with Hard and Soft Tissue II, (18 January 1995); doi: 10.1117/12.199194
Show Author Affiliations
Hans Surya Pratisto, Univ. Bern (Switzerland)
Martin Frenz, Univ. Bern (Switzerland)
Michael Ith, Univ. Bern (Switzerland)
Hans Joerg Altermatt, Univ. Bern (Switzerland)
Heinz P. Weber, Univ. Bern (Switzerland)

Published in SPIE Proceedings Vol. 2323:
Laser Interaction with Hard and Soft Tissue II
Hans Joerg Albrecht; Guy P. Delacretaz; Thomas H. Meier; Rudolf W. Steiner; Lars Othar Svaasand; Martin J. C. van Gemert, Editor(s)

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