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An Electro-Thermal Actuation Method for Resonance Vibration of a Miniaturized Optical-Fiber Scanner for Future Scanning Fiber Endoscope Design

机译：用于未来扫描光纤内窥镜设计的小型光纤扫描仪共振振动的电热驱动方法

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Medical professionals increasingly rely on endoscopes to carry out many minimally invasive procedures on patients to safely examine, diagnose, and treat a large variety of conditions. However, their insertion tube diameter dictates which passages of the body they can be inserted into and, consequently, what organs they can access. For inaccessible areas and organs, patients often undergo invasive and risky procedures—diagnostic confirmation of peripheral lung nodules via transthoracic needle biopsy is one example from oncology. Hence, this work sets out to present an optical-fiber scanner for a scanning fiber endoscope design that has an insertion tube diameter of about 0.5 mm, small enough to be inserted into the smallest airways of the lung. To attain this goal, a novel approach based on resonance thermal excitation of a single-mode 0.01-mm-diameter fiber-optic cantilever oscillating at 2–4 kHz is proposed. The small size of the electro-thermal actuator enables miniaturization of the insertion tube. Lateral free-end deflection of the cantilever is used as a benchmark for evaluating performance. Experimental results show that the cantilever can achieve over 0.2 mm of displacement at its free end. The experimental results also support finite element simulation models which can be used for future design iterations of the endoscope.
机译：医疗专业人员越来越依赖内镜，对患者进行许多微创手术，以安全检查，诊断和治疗各种条件。然而，它们的插入管直径决定了它们可以插入的身体的通道，从而可以进入的器官。对于无法进入的地区和器官，患者通常经常经历侵入性和危险的程序 - 通过经脑针活检的外周肺结节进行诊断确认是肿瘤学的一个例子。因此，该工作列出了扫描光纤内窥镜设计的光纤扫描仪，该扫描光纤内窥镜设计具有约0.5mm的插入管直径，足够小以插入肺的最小气道中。为了实现这一目标，提出了一种基于2-4 kHz振荡的单模0.01mm直径光纤悬臂振荡的共振热激励的新方法。电热驱动器的小尺寸可以使插入管的小型化。悬臂的横向自由端偏转用作评估性能的基准。实验结果表明，悬臂可在其自由端达到超过0.2毫米的位移。实验结果还支持有限元模拟模型，可用于内窥镜的未来设计迭代。

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