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Proceedings Paper

Endoscopically controlled laser lithotripsy of salivary gland calculi and the problem of fiber wear
Author(s): Johannes Tschepe; Peter Gundlach; Nils Leege; Juergen U. G. Hopf; Gerhard J. Mueller; Hans H. Scherer
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Paper Abstract

Seventy-three patients suffering from sialolithiasis were treated by endoscopically controlled, laser-induced lithotripsy (LIL). The non-sedated patients were treated under local anaesthetic with specially developed endoscopes with a diameter < 1.8 mm. A laser fiber was then positioned on the concrement which was finally fragmented while being monitored using a pulsed excimer laser (308 nm), a dye laser (504 nm), and an Alexandrite laser (755 nm). In all cases a complete fragmentation of the stone was achieved. This approach to laser lithotripsy of salivary gland calculi with endoscopic monitoring represents a novel method which permits an out-patient treatment under local anaesthetic with a minimum inconvenience to the patient. In `in vitro' experiments the effectiveness of the stone destruction (plasma formation rate, the number of pulses required to fragment the stone, and fragment size) were tested. The quantitative assessment of the fiber end surface during direct contact and the determination of the shape and size of the broken fiber pieces have been tested. A possibility to avoid the fiber wear was developed. It's called `Index Matching' and needs a special endoscopic integrated flushing system.

Paper Details

Date Published: 1 August 1992
PDF: 10 pages
Proc. SPIE 1649, Optical Fibers in Medicine VII, (1 August 1992); doi: 10.1117/12.60242
Show Author Affiliations
Johannes Tschepe, Laser-Medizin-Zentrum GmbH (Germany)
Peter Gundlach, Freie Univ. Berlin (Germany)
Nils Leege, Freie Univ. Berlin (Germany)
Juergen U. G. Hopf, Freie Univ. Berlin (Germany)
Gerhard J. Mueller, Laser-Medizin-Zentrum GmbH (Germany)
Hans H. Scherer, Freie Univ. Berlin (Germany)

Published in SPIE Proceedings Vol. 1649:
Optical Fibers in Medicine VII
Abraham Katzir, Editor(s)

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