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首页> 外文期刊>Measurement Science & Technology >An in-fiber Bragg grating sensor for contact force and stress measurements in articular joints
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An in-fiber Bragg grating sensor for contact force and stress measurements in articular joints

机译：一种光纤布拉格光栅传感器，用于测量关节中的接触力和应力

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摘要

We present an in-fiber Bragg grating-based sensor (240 (mu)m diameter) for contact force/stress measurements in articular joints. The contact force sensor and another Bragg grating-based pressure sensor (400 (mu)m diameter) are used to conduct the first simultaneous measurements of contact force/stress and fluid pressure in intact cadaveric human hips. The contact force/stress sensor addresses limitations associated with stress-sensitive films, the current standard tools for contact measurements in joints, including cartilage modulus-dependent sensitivity of films and the necessity to remove biomechanically relevant anatomy to implant the films. Because stress-sensitive films require removal of anatomy, it has been impossible to validate the mechanical rationale underlying preventive or corrective surgeries, which repair these anatomies, by conducting simultaneous stress and pressure measurements in intact hips. Methods are presented to insert the Bragg grating-based sensors into the joint, while relevant anatomy is left largely intact. Sensor performance is predicted using numerical models and the predicted sensitivity is verified through experimental calibrations. Contact force/stress and pressure measurements in cadaveric joints exhibited repeatability. With further validation, the Bragg grating-based sensors could be used to study the currently unknown relationships between contact forces and pressures in both healthy and degenerated joints.
机译：我们介绍了一种基于光纤布拉格光栅的传感器（直径为240μm），用于测量关节中的接触力/应力。接触力传感器和另一个基于布拉格光栅的压力传感器（直径为400μm）用于在完整的尸体人体臀部中进行接触力/应力和流体压力的首次同时测量。接触力/应力传感器解决了与应力敏感膜相关的局限性，当前用于关节中接触测量的标准工具，包括取决于软骨模量的膜敏感性以及去除生物力学相关解剖结构以植入膜的必要性。由于应力敏感膜需要去除解剖结构，因此无法通过在完整的髋部同时进行压力和压力测量来验证预防性或矫正性手术背后的机械原理，从而修复这些解剖结构。提出了将基于布拉格光栅的传感器插入关节的方法，而相关的解剖结构却基本保持不变。使用数值模型预测传感器性能，并通过实验校准验证预测的灵敏度。尸体关节的接触力/应力和压力测量显示出可重复性。经过进一步验证，基于布拉格光栅的传感器可用于研究健康和退化关节中接触力和压力之间的当前未知关系。

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