A Miniaturized FBG Shape Sensor Based on a NiTi Substrate for Integration With Interventional Catheters

Lizhuang Sun; Weihan Zhang; Zhangrui Yang; Yichao Tang

doi:10.54691/0zjg0927

Authors

Lizhuang Sun
Weihan Zhang
Zhangrui Yang
Yichao Tang

DOI:

https://doi.org/10.54691/0zjg0927

Keywords:

Fiber Bragg Gratings; NITI Substrate; Shape Sensing; Three-dimensional Reconstruction.

Abstract

Three-dimensional catheter shape reconstruction is of considerable significance for minimally invasive cardiovascular navigation. This paper proposes a compact optical sensing scheme based on Fiber Bragg Gratings embedded in a NiTi-supported catheter structure. By combining strain-derived curvature estimation with Frenet-frame integration, the proposed method enables reconstruction of the catheter centerline from measured wavelength variations. The sensing structure is designed for improved compatibility with interventional catheter systems while maintaining a compact form factor. Static tests in planar and spatial bending configurations confirm that the reconstruction error remains within the millimeter range, demonstrating the practicality of the proposed approach.

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