Silica-based rod lens for the medical fiberscope

Ken-ichi Nakatate; Naoki Shamoto; Tateuki Oohashi; Takashi Tsumanuma; Kazuo Sanada

doi:10.1117/12.180713

28 July 1994 Silica-based rod lens for the medical fiberscope

Ken-ichi Nakatate, Naoki Shamoto, Tateuki Oohashi, Takashi Tsumanuma, Kazuo Sanada

Proceedings Volume 2131, Biomedical Fiber Optic Instrumentation; (1994) https://doi.org/10.1117/12.180713
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

The ultrathin fiberscope, in which the outer diameter is under 1.0 mm, has made possible the direct observation of narrow portions within the human body. The fiberscope mainly consists of the imagefiber, the objective lens, and the illumination fiber, and each advance of these devices has brought the reduction of the scope-diameter. We have investigated the silica based rod lens for the following merits: (1) The fiberscope can be sterilized by the (gamma) -ray instead of ethylene oxide gas which has the problem of carcinogenicity, because the silica glass has high radiation resistant characteristics. (2) The silica based rod lens can be spliced with the imagefiber without any adhesive agent by using the arc fusion splicing machine. As a result, the reliability of the fiberscope can be significantly improved. The silica based rod lens with 125 micrometers in diameter was fabricated by drawing from preform rod made by the vapor phase axial deposition method. The characteristics of their images were evaluated by the modulation transfer function method. This paper presents the details of the fabrication technique of the silica based rod lens and its characteristics.

Citation Download Citation

Ken-ichi Nakatate, Naoki Shamoto, Tateuki Oohashi, Takashi Tsumanuma, and Kazuo Sanada "Silica-based rod lens for the medical fiberscope", Proc. SPIE 2131, Biomedical Fiber Optic Instrumentation, (28 July 1994); https://doi.org/10.1117/12.180713

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