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Proceedings Paper

Laser restoration of flow in occluded ventricular shunts for pediatric neurosurgery
Author(s): William A. Christens-Barry; Michael Guarnieri; Benjamin S. Carson
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Paper Abstract

We have investigated the use of short pulses of infrared ((lambda) equals 2.09 micrometers ) light from a Ho:YAG laser to photofragment occlusions and restore flow in ventricular shunts, which provide the sole means of maintaining proper intracranial pressure in hydrocephalus patients. These experiments employed model tissues, a polymeric model compound, and patient explants in order to determine appropriate pulse energies and delivery rates for removal of occlusions material. Laser energy doses and rates of occlusion removal were established for these materials. Laser energy doses that do not damage the shunt device or surrounding tissue were identified. Optical fibers (25 ga. or smaller) can be introduced through the dome of current shunt devices and threaded to the occlusion site. Clinical application will require the continued development of an introducer tool for the transcutaneous insertion of the optical fiber into the shunt device and irrigation techniques for removing the occlusion detritus generated by photofragmentation treatment. Using this approach, a minimally invasive and benign procedure for in situ restoration of flow in occluded neurological implant devices becomes possible.

Paper Details

Date Published: 19 January 1998
PDF: 9 pages
Proc. SPIE 3193, Photothermal Therapies in Medicine, (19 January 1998); doi: 10.1117/12.300835
Show Author Affiliations
William A. Christens-Barry, Johns Hopkins Univ. (United States)
Michael Guarnieri, Johns Hopkins Hospital (United States)
Benjamin S. Carson, Johns Hopkins Hospital (United States)

Published in SPIE Proceedings Vol. 3193:
Photothermal Therapies in Medicine
Gaetano Bandieramonte; Stephen G. Bown; Fausto Chiesa; Jacques Donnez; Herbert J. Geschwind; Gian Francesco Lombard; Gerhard J. Mueller; Hans-Dieter Reidenbach, Editor(s)

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