An optical monitoring device for monitoring curvature along a flexible medical instrument including optical fibers, a light source to inject light into the optical fibers, a light receiver configured to measure an optical characteristic of reflected light from the optical fibers, a processor to analyze the measured optical characteristic to determine a curvature of the optical fibers, compare the curvature with a threshold curvature, determine a location along the optical fibers of the determined curvature, store previous curvatures and their associated location along the fibers in a storage, analyze the stored curvatures by counting or summing curvatures determined at a given location over time to predict breakdown of the flexible medical instrument, and produce an indication when the stored curvatures determined at the given location over time predict breakdown of the flexible medical instrument at the given location.
