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Proceedings Paper

Characterization of laser-tissue interaction by laser plume species
Author(s): Hans-Juergen Weigmann; Juergen Lademann; Jochen Liebetruth
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Paper Abstract

Gas chromatography (GC), mass spectrometry (MS), GC/MS technique and standardized methods have been used to investigate harmful chemicals produced during laser treatment of tissue and to find relations between the emitted molecules and interaction processes. It has been found that the emission of carbon monoxide is strongly connected with carbonization. Hydrocyanic acid is well suited to get information on processes, characterizing laser tissue interaction, e.g., plasma behavior. From results obtained by variation of the reaction gas atmosphere (helium, nitrogen oxygen, air) it becomes clear that two processes must be taken into account, oxidation (combustion) and the preferred formation of compounds characterized by the cyano group. It is possible to reduce the amount of emitted hydrocyanic acid drastically working in an oxygen atmosphere. The typical substances arising during laser tissue interaction were compared with the emission obtained by laser treatment of fiber-reinforced plastics, pointing out that the high temperature region (plasma torch) is an important source of the emitted substances.

Paper Details

Date Published: 1 February 1994
PDF: 6 pages
Proc. SPIE 2077, Laser Interaction with Hard and Soft Tissue, (1 February 1994); doi: 10.1117/12.168042
Show Author Affiliations
Hans-Juergen Weigmann, Universitaets Klinikum Charite (Germany)
Juergen Lademann, Univ. der Bundeswehr Muenchen (Germany)
Jochen Liebetruth, Universitaets Klinikum Charite (Germany)

Published in SPIE Proceedings Vol. 2077:
Laser Interaction with Hard and Soft Tissue
Martin J. C. van Gemert; Rudolf W. Steiner; Lars Othar Svaasand; Hansjoerg Albrecht, Editor(s)

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