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Proceedings Paper

Smart optical fiber probes for precise tissue treatment
Author(s): Ilko K. Ilev; Ronald W. Waynant; Mary Reiter
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Paper Abstract

Optical features of a novel technique for fiber-optic-based laser delivery into a precise tissue area are investigated. As a key optical element, the technique includes a single delivery fiber with a specially angle shaped tip. Because of the frustrated-total-internal-reflectance caused by the refractive-index change of the surrounding medium, the angled fiber tip acts as a smart, tissue-activated probe. It provides a safe way for laser delivery that includes only two states of tissue illumination: (1) off-state (no tissue illumination), when the fiber tip is out of the tissue area and the laser emission is backreflected due to total-internal-reflection; and (2) on-state (maximum tissue illumination), when the fiber tip is on the absorbing tissue area and becomes transparent because of the frustrated-total-internal-reflectance and the laser energy is coupled into the absorber. Here, optical properties of tissue-activated fiber probes used for precise laser delivery are investigated both experimentally and theoretically by analyzing the backreflectance signal power. Optical fibers with various geometrical parameters are used and a spatial resolution of 2 micrometers is achieved when the fiber tip is moved toward the absorption tissue surface. The results confirm the system potential for on-the-spot laser delivery applicable to precise laser treatment, tissue diagnostics, and micro-scale surgical procedures.

Paper Details

Date Published: 26 March 2002
PDF: 9 pages
Proc. SPIE 4616, Optical Fibers and Sensors for Medical Applications II, (26 March 2002); doi: 10.1117/12.463817
Show Author Affiliations
Ilko K. Ilev, FDA Ctr. for Devices and Radiological Health (United States)
Ronald W. Waynant, FDA Ctr. for Devices and Radiological Health (United States)
Mary Reiter, Marquette Univ. (United States)


Published in SPIE Proceedings Vol. 4616:
Optical Fibers and Sensors for Medical Applications II
Israel Gannot, Editor(s)

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