Miniaturized fiber optic sensor for measuring intervertebral disc pressure

Silas Nesson, Miao Yu, Xuming Zhang, Adam H. Hsieh

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

2 Citations (Scopus)

Abstract

This paper reports the development of a miniature fiber optic pressure sensor system for in vitro intradiscal pressure measurements for rodents. The primary focus of this work is the design and fabrication of a sensor element with a multi-layer polymer-metal diaphragm. This diaphragm consists of a base polyimide layer (150 nm thick), a metal reflective layer (1 μm thick), and another polyimide layer for protection and isolation (150 nm thick). The sensor element is biocompatible and can be fabricated by simple, batch-fabrication methods in a non- cleanroom environment with good device-to-device uniformity. The fabricated sensor element has an outer diameter of only 366 μn, which is small enough to be inserted into the rodent discs without disrupting the structure or altering the intradiscal pressures. In the calibration and in vitro rodent intradiscal pressure measurements, the sensor element exhibits a linear response to the applied pressure over the range of 0 - 70 kPa, with a sensitivity of 0.0206 μm/kPa and a resolution of 0.17 kPa.
Original languageEnglish
Title of host publicationSociety for Experimental Mechanics - 11th International Congress and Exhibition on Experimental and Applied Mechanics 2008
Pages1964-1971
Number of pages8
Volume4
Publication statusPublished - 22 Dec 2008
Event11th International Congress and Exhibition on Experimental and Applied Mechanics 2008 - Orlando, FL, United States
Duration: 2 Jun 20085 Jun 2008

Conference

Conference11th International Congress and Exhibition on Experimental and Applied Mechanics 2008
Country/TerritoryUnited States
CityOrlando, FL
Period2/06/085/06/08

Keywords

  • Fiber optic sensors
  • Intervertebral disc pressure
  • Low coherence interferometry
  • Pressure sensors

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials

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