28 August 1992 Radially focusing fiber optic probes for laser angioplasty
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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.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Richard T. Mihran, Huey-Daw Wu, Frank S. Barnes, "Radially focusing fiber optic probes for laser angioplasty", Proc. SPIE 1642, Diagnostic and Therapeutic Cardiovascular Interventions II, (28 August 1992); doi: 10.1117/12.137299; https://doi.org/10.1117/12.137299

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