耦合到医疗针的多模态换能器-波导构造
Multi-modal transducer-waveguide construct coupled to a medical needle
摘要：
全球每年消耗超过160亿支医用针头。然而，医用针的功能仍然限于切割和输送或抽吸材料通过针到达目标部位。超声波与皮下注射针相结合可能会增加许多医疗应用的价值，例如减轻疼痛，增加精度，减少组织偏转，甚至改善组织收集。在这项研究中，我们介绍了一种波导结构，使一个有效的方式转换的纵波模式弯曲模式，并耦合到一个传统的医疗针转换波模式，同时保持高的电声功率效率。波导的结构优化是通过使用有限元方法在计算机上实现的，然后对原型的构造和实验表征进行原型化。在30 kHz下的实验表明，弯曲尖端位移高达200 μm，低功耗（低于5 W），效率高达69%。换能器的高电声效率和小尺寸将有助于医疗针和活检装置的设计，潜在地实现便携性、电池化和低电功率的高患者安全性。
英文摘要：
Annually, more than 16 billion medical needles are consumed worldwide. However, the functions of the medical needle are still limited to cutting and delivering or drawing material through the needle to a target site. Ultrasound combined with hypodermic needle could potentially add value to many medical applications such as pain reduction, adding precision, deflection reduction in tissues and even improve tissue collection. In this study we introduce a waveguide construct enabling an efficient way to convert a longitudinal wave mode to flexural mode and to couple the converted wave mode to a conventional medial needle, while maintaining high electric-to-acoustic power efficiency. The structural optimization of the waveguide was realized in silico using the finite element method followed by prototyping the construct and experimental characterization of the prototypes. The experiments at 30 kHz demonstrate flexural tip displacement up to 200 μm, at low electrical power consumption (under 5 W), with up to 69% of efficiency. The high electric-to-acoustic efficiency and small size of the transducer would facilitate design of medical needle and biopsy devices, potentially enabling portability, batterization and high patient safety with low electric powers.
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