&lt;title&gt;Forming of laser beams by optical fibers with beveled tips&lt;/title&gt;

Melnik, Ivan S.; Fischer, M.; Flemming, Gabriela; Hibst, Raimund

doi:10.1117/12.146346

Cited by 3 publications

(5 citation statements)

References 6 publications

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“…Thus, the fiber is protected from overheating, as well as from direct contact with a tissue. In contrast to the previously developed sapphire tapered and rounded tips, which were produced by mechanical shaping and assumed complex connection with fiber and adjusting system [59][60][61][62], the described sapphire needle has the internal channel for accommodating optical fiber and does not require additional connection elements. During the shaped crystal growth, it is possible to change the position of the internal channel, the length and diameter of the waveguiding part, and the radius of the focusing surface.…”

Section: Discussionmentioning

confidence: 99%

Microfocusing sapphire capillary needle for laser surgery and therapy: Fabrication and characterization

Dolganova

Shikunova

Zotov

et al. 2020

Journal of Biophotonics

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A sapphire shaped capillary needle designed for collimating and focusing of laser radiation was proposed and fabricated by the edge-defined film-fed growth technique. It features an as-grown surface quality, high transparency for visible and near-infrared radiation, high thermal and chemical resistance and the complex shape of the tip, which protects silica fibers. The needle's geometrical parameters can be adjusted for use in various situations, such as type of tissue, modality of therapy and treatment protocol. The focusing effect was demonstrated numerically and observed experimentally during coagulation of the ex vivo porcine liver samples. This needle in combination with 0.22NA optical fiber allows intensive and uniform coagulation of 150 mm 3 volume interstitially and 30 mm 3 superficially by laser exposure with 280 J without tissue carbonization and fiber damaging along with delicate treatment of small areas. The demonstrated results reveal the perspectives of the proposed sapphire microfocusing needle for laser surgery and therapy.

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Section: Discussionmentioning

confidence: 99%

Microfocusing sapphire capillary needle for laser surgery and therapy: Fabrication and characterization

Dolganova

Shikunova

Zotov

et al. 2020

Journal of Biophotonics

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“…(4%-30%) of the main beam, 10,14 and some designs also cause beam focusing. 10 The effects of these spurious reflections and beam focusing properties are accounted for in the optical phantom.…”

Section: Discussionmentioning

confidence: 99%

“…The relative fluence rate shown in the figure does not decrease exponentially from zero as the modeled fiber, however, the reflective surface of the Urogold sidefiring fiber is concave, and this distorts the symmetrical beam distribution emitted from its fiber. For those fibers that refract the beam with TIR and produce an asymmetrical focused beam, 10,14 the maximum fluence level appears between the 0 and the 5 mm radial positions. An example of this is shown in Figure 7(b) for the ADD side-firing fiber.…”

Section: Discussionmentioning

confidence: 99%

“…12,13 In addition, analytic optical analysis of side-firing fibers which deflect the beam by refraction (TIR) has also been performed. 10,14 Efforts to understand the clinical dosimetry of the coagulation procedure have resulted in studies that use analytic and/or laboratory techniques. Analytic modeling which accounts for the dynamic physical changes to optical and thermal coefficients as well as heat dissipation due to blood flow has been performed with nonlinear finite element analysis.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Fluence Rate Distributions Made by Side-Firing Fibers in an Optical Phantom

Royston

Richards²

1999

J. Biomed. Opt.

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Side-firing fibers are used to provide coagulative therapy to the urologic tract. These fibers use different optical technologies to deflect the beam transverse to the fibers' optical axis. This produces emitted beams which differ in both beam direction and divergence angles. The relative optical performance of 13 fibers was studied in an optical phantom suspension. The fluence rate distribution created by each side-firing fiber was determined. The fluence rate distribution accounts for both the direct and spurious beams emitted from side-firing fibers as well as the light scattering produced by the target tissue. Based upon limited clinical dosimetry studies, the relative fluence rate distribution appears to indicate general exposure conditions for the evaluated fibers. © 1999 Society of Photo-Optical Instrumentation Engineers.

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“…Symposium on Laser, Fiber, and Clinical Imaging in Medicine, on Feb.17, 1993, in Los Angeles, CA, and it will be published in SPIE proceedings Vol. 1878,1878-30, 1993. This device and the fabrication methods of making same have been submitted in a United States patent application.…”

mentioning

confidence: 99%

Novel Cylindrical Illuminator Tip for Ultraviolet Light Delivery

Shangguan¹

2000

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<title>Forming of laser beams by optical fibers with beveled tips</title>

Cited by 3 publications

References 6 publications

Microfocusing sapphire capillary needle for laser surgery and therapy: Fabrication and characterization

Microfocusing sapphire capillary needle for laser surgery and therapy: Fabrication and characterization

Comparison of Fluence Rate Distributions Made by Side-Firing Fibers in an Optical Phantom

Novel Cylindrical Illuminator Tip for Ultraviolet Light Delivery

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