Miniature fiber-optic force sensor for vitreoretinal microsurgery based on low-coherence Fabry-Pérot interferometry

Xuan Liu, Iulian I. Iordachita, Xingchi He, Russell H. Taylor, Jin U. Kang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish (US)
Title of host publicationOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XII
DOIs
StatePublished - 2012
EventOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XII - San Francisco, CA, United States
Duration: Jan 21 2012Jan 22 2012

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume8218
ISSN (Print)1605-7422

Other

OtherOptical Fibers and Sensors for Medical Diagnostics and Treatment Applications XII
CountryUnited States
CitySan Francisco, CA
Period1/21/121/22/12

Keywords

  • Fabry-Pérot interferometer
  • Fiber-optics
  • Force sensor
  • Phase sensitive

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging

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