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Proceedings Paper

Novel cylindrical illuminator tip for ultraviolet light delivery
Author(s): HanQun Shangguan; Thomas E. Haw; Kenton W. Gregory M.D.; Lee W. Casperson
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Paper Abstract

The design, processing, and sequential testing of a novel cylindrical diffusing optical fiber tip for ultraviolet light delivery is described. This device has been shown to uniformly (+/- 15%) illuminate angioplasty balloons, 20 mm in length, that are used in an experimental photochemotherapeutic treatment of swine intimal hyperplasia. Our experiments show that uniform diffusing tips of < 400 micron diameter can be reliably constructed for this and other interstitial applications. Modeling results indicate that this design is scalable to smaller diameters. The diffusing tips are made by stripping the protective buffer and etching away the cladding over a length of 20 mm from the fiber tip and replacing it with a thin layer of optical epoxy mixed with Al2O3 powder. To improve the uniformity and ease of fabrication, we have evaluated a new device configuration where the tip is etched into a modified conical shape, and the distal end face is polished and then coated with an optically opaque epoxy. This is shown to uniformly scatter approximately 70% of the light launched into the fiber without forward transmission.

Paper Details

Date Published: 23 June 1993
PDF: 16 pages
Proc. SPIE 1878, Diagnostic and Therapeutic Cardiovascular Interventions III, (23 June 1993); doi: 10.1117/12.146582
Show Author Affiliations
HanQun Shangguan, Portland State Univ. (United States)
Thomas E. Haw, St. Vincent Hospital and Medical Ctr. (United States)
Kenton W. Gregory M.D., St. Vincent Hospital and Medical Ctr. (United States)
Lee W. Casperson, Portland State Univ. (United States)

Published in SPIE Proceedings Vol. 1878:
Diagnostic and Therapeutic Cardiovascular Interventions III
George S. Abela M.D., Editor(s)

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