Design of a Slender Tuned Ultrasonic Needle for Bone Penetration
Design of a Slender Tuned Ultrasonic Needle for Bone Penetration
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用于骨穿透的细长调谐超声针的设计
DOI：
10.1016/j.phpro.2015.08.005
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Cleary R
中科院分区：
文献类型：
--
作者：
Cleary R
本文报告了一种超声波骨活检针，特别关注适用于任何细长调谐超声波设备组件的设计指南。超声波手术设备通常用于切割一系列生物组织，例如骨骼。然而，超声骨活检针的实现尤其具有挑战性。这是因为需要产生能够穿透矿化组织的足够振动幅度，同时避免弯曲振动响应，众所周知，弯曲振动响应会降低细长超声波设备的性能和可靠性。这项研究使用有限元分析 (FEA) 来预测谐振针的振动行为，该谐振针的尺寸与 8Gx4 英寸骨髓活检针非常匹配。针的特征，包括材料的变化和直径的重复变化，已经被包括在内并被系统地改变，以证明这些特征的位置和几何形状可以显着影响弯曲和扭转振动模式的共振频率，同时对调谐纵向模式的频率和形状影响有限。实验模态分析用于确定所选针设计的模态参数，验证纵向模式和闭合弯曲模式的 FEA 模型预测。这证明可以通过明智的小几何修改来避免模态耦合。最后，在典型的操作激励条件下驱动调谐针组件，以证明超声活检针可以设计为以纯纵向运动操作。
This paper reports on an ultrasonic bone biopsy needle, particularly focusing on design guidelines applicable for any slender tuned ultrasonic device component. Ultrasonic surgical devices are routinely used to cut a range of biological tissues, such as bone. However the realisation of an ultrasonic bone biopsy needle is particularly challenging. This is due to the requirement to generate sufficient vibrational amplitude capable of penetrating mineralised tissue, while avoiding flexural vibrational responses, which are known to reduce the performance and reliability of slender ultrasonic devices. This investigation uses finite element analysis (FEA) to predict the vibrational behaviour of a resonant needle which has dimensions that match closely to an 8Gx4inch bone marrow biopsy needle. Features of the needle, including changes in material and repeated changes in diameter, have been included and systematically altered to demonstrate that the location of and geometry of these features can significantly affect the resonant frequency of bending and torsional modes of vibration while having a limited effect on the frequency and shape of the tuned longitudinal mode. Experimental modal analysis was used to identify the modal parameters of the selected needle design, validating the FEA model predictions of the longitudinal mode and the close flexural modes. This verifies that modal coupling can be avoided by judicious small geometry modifications. Finally, the tuned needle assembly was driven under typical operational excitation conditions to demonstrate that an ultrasonic biopsy needle can be designed to operate in a purely longitudinal motion.