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Proceedings Paper

Effects of different IR laser systems on the tympanic membrane
Author(s): Benedikt W. Sedlmaier; Alexander Bloedow; Sergije Jovanovic; Lev Nagli; Hans-Georg Eberle
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Paper Abstract

Lasers suitable for myringotomy are the erbium:YAG laser (2940 nm) and the carbon-dioxide laser (10600 nm). The study examines the laser-tissue interaction with tympanic membranes of guinea-pigs, horses and formalin-fixed human tympanic membranes and the effects demonstrated by light-microscopy and scanning-electron-microscopy. The minimum energy densities for a perforation with the erbium:YAG laser in guinea-pig ear drums and formalin-fixed human tympanic membranes are 8 J/cm2 and 16 J/cm2 respectively. There are no thermic side effects. With the carbon-dioxide laser thermic side effects only occur with energy transmission via silver halide polycrystalline fiber. The minimum power density for perforation is 400 W/cm2 (pulse duration 50 ms). With the microslad 719 micromanipulator (Sharplan, Israel, Tel Aviv), the minimum power densities for perforation of guinea-pig and horse eardrums and for formalin-fixed human tympanic membranes are 150 W/cm2, 300 W/cm2 and 600 W/cm2 (pulse duration: 50 ms) respectively. The minimum power density to achieve a perforation with the SwiftLaseTM 757 scanner (Sharplan, Israel, Tel Aviv), is 250 W/cm2 in guinea-pig eardrums (pulse duration: 100 ms). A prototype of a hand-held carbon-dioxide laser otoscope is suitable for performing laser myringotomies in formalin-fixed human tympanic membranes.

Paper Details

Date Published: 22 May 1997
PDF: 5 pages
Proc. SPIE 2970, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems VII, (22 May 1997); doi: 10.1117/12.275033
Show Author Affiliations
Benedikt W. Sedlmaier, Benjamin Franklin Medical Ctr./Freie Univ. Berlin (Germany)
Alexander Bloedow, Benjamin Franklin Medical Ctr./Freie Univ. Berlin (Germany)
Sergije Jovanovic, Benjamin Franklin Medical Ctr./Freie Univ. Berlin (Germany)
Lev Nagli, Tel Aviv Univ. (Israel)
Hans-Georg Eberle, Laser and Medical Technology/Freie Univ. Berlin (Germany)


Published in SPIE Proceedings Vol. 2970:
Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems VII
R. Rox Anderson; Harvey Lui; Michail M. Pankratov; Kenneth Eugene Bartels; Gerhard J. Mueller; Graham M. Watson; Reza S. Malek; Lawrence S. Bass; Lloyd P. Tate; Hans-Dieter Reidenbach; Kenneth Eugene Bartels; R. Rox Anderson; Lawrence S. Bass; Aaron P. Perlmutter; Kenton W. Gregory; David M. Harris; David M. Harris; Harvey Lui; Reza S. Malek; Gerhard J. Mueller; Michail M. Pankratov; Aaron P. Perlmutter; Hans-Dieter Reidenbach; Lloyd P. Tate; Graham M. Watson, Editor(s)

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