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Proceedings Paper

Miniature fiber-optic force sensor for vitreoretinal microsurgery based on low-coherence Fabry-Pérot interferometry
Author(s): Xuan Liu; Iulian I. Iordachita; Xingchi He; Russell H. Taylor; Jin U. Kang
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Paper Abstract

Vitreoretinal surgery requires delicate manipulation of retinal tissue. However, tool-to-tissue interaction forces in the order of sub-millinewton are usually below the human sensory threshold. A surgical force sensor (FS) compatible with conventional surgical tools may significantly improve the surgery outcome by preventing tissue damage. We have designed and built a miniature FS for vitreoretinal surgery using a fiber-optic common-path phase-sensitive optical coherence tomography (OCT) system where the distal end of the fiber probe forms a low-finesse Fabry-Pérot (FP) cavity between the cleaved tip of the lead-in single mode fiber and the polished back surface of a stainless steel surgical tool tip. To accurately measure the change of the FP cavity length, the cavity is interrogated by the fiber-optic common-path phase-sensitive OCT. The FP cavity was illuminated with a broadband light source, and the interferometric signal was detected using a broadband spectrometer. The phase of the interferometric signal, which is proportional to the cavity length change as well as the exerted force, was extracted. We have conducted calibration experiments to characterize our one dimensional FS. Our result shows that the FS responses linearly to force in axial direction with force sensitivity better than 0.25 millinewton.

Paper Details

Date Published: 30 January 2012
PDF: 6 pages
Proc. SPIE 8218, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XII, 82180O (30 January 2012); doi: 10.1117/12.908370
Show Author Affiliations
Xuan Liu, The Johns Hopkins Univ. (United States)
Iulian I. Iordachita, The Johns Hopkins Univ. (United States)
Xingchi He, The Johns Hopkins Univ. (United States)
Russell H. Taylor, The Johns Hopkins Univ. (United States)
Jin U. Kang, The Johns Hopkins Univ. (United States)

Published in SPIE Proceedings Vol. 8218:
Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XII
Israel Gannot, Editor(s)

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