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Optical Engineering

Hypodermic Fiberscope
Author(s): Max Epstein
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Paper Abstract

The development of a hypodermic fiberscope for the visualization of internal organs and tissue is described. It is based on a unique capability of preparation of microlenses (0.5 mm diameter) and the fabrication of high resolution imaging multifibers. The design of typical prototype instruments is described. Among these are a hypodermic structure of gauge 18 (1.25 mm diameter) which includes a 0.5 mm diameter imaging multifiber made of 11,000 individual fibers about 5 pm each with two piano-convex distal lenses, over two hundred illumination fibers of 50 pm diameter each, and an ancillary channel for a biopsy tool, aspiration or insufflation. Also, separate illumination and imaging probes were constructed with the latter being of size 22 gauge and having three distal lenses of 0.5 mm diameter. Although provisions for focusing are available, the depth of field of the described probes ranges from several millimeters to infinity with a field of view of about 700. The application of currently designed prototype hypodermic fiberscopes in several medical procedures is discussed.

Paper Details

Date Published: 1 April 1974
PDF: 4 pages
Opt. Eng. 13(2) 132139 doi: 10.1117/12.7971687
Published in: Optical Engineering Volume 13, Issue 2
Show Author Affiliations
Max Epstein, Northwestern University (United States)


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