Radially focusing fiber optic probes for laser angioplasty

Richard T. Mihran; Huey-Daw Wu; Frank S. Barnes

doi:10.1117/12.137299

28 August 1992 Radially focusing fiber optic probes for laser angioplasty

Richard T. Mihran, Huey-Daw Wu, Frank S. Barnes

Proceedings Volume 1642, Diagnostic and Therapeutic Cardiovascular Interventions II; (1992) https://doi.org/10.1117/12.137299
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

In this paper a novel laser angioplasty probe is presented in which the emitted beam from a multi-mode fiber is both radially reflected and simultaneously focused to form a well-defined ring of high intensity light which is concentric with the fiber axis. The intensity distribution of the probe emission will thus exhibit a maximum at a given radial distance from the fiber axis, depending on the particular geometry of the probe. As a consequence of this convergence at a particular radius, this probe has been demonstrated in vitro to act in a self-limiting manner to enlarge an existing lumen in human atherosclerotic vessel tissue using a 4W argon laser. The small diameter (1 mm) of the probe suggests the viability for in vivo angioplasty applications. A set of fiber probes having a variety of focal ring diameters ranging from 1 to 4 mm have been fabricated, tested, and analyzed. Theoretical and experimental intensity distributions are presented, and the important parameters of the probe designed for this and additional applications are discussed.

Citation Download Citation

Richard T. Mihran, Huey-Daw Wu, and Frank S. Barnes "Radially focusing fiber optic probes for laser angioplasty", Proc. SPIE 1642, Diagnostic and Therapeutic Cardiovascular Interventions II, (28 August 1992); https://doi.org/10.1117/12.137299

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