A MANOMETRY CATHETER BASED ON FIBER BRAGG GRATINGS — TEMPERATURE COMPENSATION PERSPECTIVES AND IN VITRO STUDY

Abstract

Manometry using fiber Bragg gratings as sensing elements was recently developed and shows promising results. The use of fiber gratings in manometry has many advantages over using solid-state or water-perfused techniques. One of these is noise immunity, and adding more sensors does not require scaling the catheter diameter. However, temperature compensation is a required design criterion in fiber-based manometry. One solution is to use a catheter with two fibers: one for pressure measurements and the other for temperature compensation. This paper presents the steady-state and transient effects of temperature changes in fiber-based manometry. In vitro measurements of the catheter’s temperature-related characteristics are presented and discussed. This paper also introduces the use of a fitting function to compensate for the transient temperature response of the catheter.