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

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 resista...

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Bibliographic Details
Published in:Journal of biophotonics 2020-10, Vol.13 (10), p.e202000164-n/a
Main Authors: Dolganova, Irina N., Shikunova, Irina A., Zotov, Arsen K., Shchedrina, Marina A., Reshetov, Igor V., Zaytsev, Kirill I., Tuchin, Valery V., Kurlov, Vladimir N.
Format: Article
Language:English
Subjects:
Coagulation
Collimation
edge‐defined film‐fed growth (EFG)
Fabrication
Infrared radiation
Laser radiation
Laser surgery
laser therapy
Lasers
medical instruments
Microfocusing
Optical fibers
Sapphire
sapphire needle
sapphire shaped crystals
Silica
Silicon dioxide
Surface properties
Surgery
Therapy
Thermal resistance
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Summary: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 mm3 volume interstitially and 30 mm3 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. A sapphire microfocusing needle produced by means of the edge‐defined film‐fed growth technique can be applied for precise and intensive laser therapy and surgery. It is compatible with various types of optical fibers, protecting them from the direct contact with tissue and from overheating. Changing the needle geometry directly during the growth process, it is possible to adjust it for different tissues and types of therapy.
ISSN:1864-063X
1864-0648
DOI:10.1002/jbio.202000164