New modified optical fiber tips for medical applications

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

doi:10.1117/12.60737

Cited by 6 publications

(3 citation statements)

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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 [59–62], 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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“…In a similar way Melnik et al 11 used optical ray tracing to calculate the light distributions of aspherically modified tips (parabolic, hyperbolic, etc.). They showed, qualitatively in agreement to our results, a higher focusing effect of aspherical relative to plane and hemispherical tips.…”

Section: Discussionmentioning

confidence: 99%

Comparison of different focusing fiber tips for improved oral diode laser surgery

et al. 2012

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“…To improve the exposure conditions at the tissue-fiber interface various focusing gadgets [6]- [8] and special tips for temperature control in the interaction region [9] are employed. Optimal wavelengths and modes of laser operation have been found for some kinds of biotissues, cartilages first of all.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Biotissue Laser Resection Using Strongly Absorbing Optical Fiber Tips

Kuznetsova¹,

Karabut²,

Elagin³

et al. 2015

OPJ

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We present a laser resection technique to be used when biotissue is heated by laser radiation to the temperature of material softening and then moved apart by the lateral edge of the optical fiber with a strongly absorbing tip. The absorbing tip allows the decrease in the power of effective cutting of the laser scalpel at the wavelength of 0.97 µm. And it changes the resection speed as well as the characteristics of the damage of the tissues adjacent to the incision in experiments on model media and experimental animals.

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New modified optical fiber tips for medical applications

Cited by 6 publications

References 0 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 different focusing fiber tips for improved oral diode laser surgery

Comparative Analysis of Biotissue Laser Resection Using Strongly Absorbing Optical Fiber Tips

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