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Proceedings Paper

Laser lithotripsy using double pulse technique
Author(s): Juergen Helfmann; Klaus Doerschel; Gerhard J. Mueller
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Paper Abstract

There are currntly several methods in the field of laser lithotripsy which operate not only at different wavelengths and pulse lengths but also with various types of optical front ends and various irrigation fluids'6. The methods can be divided into two main groups: First, those which utilize stone absorption and plasma formation on the stone surface to initiate stone fragmentation, such as dye lasers. Second, those which generate shock waves and caviatation in the surrounding fluid and which require additional means to produce aplasma (e.g. irrigation, focussing fiber end or metal surfaces). The pulsed Nd:YAG laser belongs to this group. The method presented here is the double pulse technique which is a combination of both methods. It uses two laser pulses with a short time delay transmitted by means of a fiber to destroy body concrements. The first pulse is the first harmonic of the Nd:YAG laser (532nm) which improves the coupling efficiency of the laser radiation with the stone. The second pulse is in the fundamental mode of the laser (1064 nm) delivering the high energy for the stone disruption.

Paper Details

Date Published: 1 July 1990
PDF: 9 pages
Proc. SPIE 1201, Optical Fibers in Medicine V, (1 July 1990); doi: 10.1117/12.17547
Show Author Affiliations
Juergen Helfmann, Laser-Medizin-Zentrum GmbH (Germany)
Klaus Doerschel, Laser-Medizin-Zentrum GmbH (Germany)
Gerhard J. Mueller, Laser-Medizin-Zentrum GmbH (Germany)

Published in SPIE Proceedings Vol. 1201:
Optical Fibers in Medicine V
Abraham Katzir, Editor(s)

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