Comparison of Longitudinal-mode and Longitudinal-torsional Mode Ultrasonic Bone Biopsy Devices

Cleary, R. and Lucas, M. (2019) Comparison of Longitudinal-mode and Longitudinal-torsional Mode Ultrasonic Bone Biopsy Devices. In: 2018 IEEE International Ultrasonics Symposium (IUS), Kobe, Japan, 22-25 Oct 2018, ISBN 9781538634257 (doi:10.1109/ULTSYM.2018.8579919) (Early Online Publication)

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Abstract

Previous research by the authors has demonstrated the efficacy of an ultrasonic bone biopsy device that operates in a longitudinal (L)mode. Ultrasonic longitudinal-torsional (L-T)coupled vibration has proven successful in several applications including ultrasonic surgical devices. In this work, an L-mode ultrasonic bone biopsy device was geometrically modified by introducing helical slits to degenerate the longitudinal vibration into a composite L-T motion. The performance of the L-T biopsy needle device was then compared with the L-mode needle device based on their ability to penetrate animal bone samples. Finite element analysis was used to design the L-T needle. The depth and pitch of the helical slits were systematically modified in the FEA model with the aim of maximizing the achievable torsional displacement while ensuring sufficient frequency spacing between the L-T mode and the neighboring flexural modes. Experimental modal analysis (EMA)of the fabricated ultrasonic device was used to identify the modal parameters and validate the FEA model. Comparative penetration tests showed that to achieve penetration with the L-mode device, the operator was required to apply a slow backward and forward rotation as well as the small forward force, to maintain a forward motion and avoid imprinting of the needle tip. The resulting hole was slightly conical with some micro-damage on the hole surface. The L-T mode device, however, could penetrate the same animal bone sample only applying a small forward force, hence simplifying the procedure, increasing precision and resulting in a cylindrical, less damaged hole surface.

Item Type:Conference Proceedings
Status:Early Online Publication
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cleary, Ms Rebecca and Lucas, Professor Margaret
Authors: Cleary, R., and Lucas, M.
Subjects:T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Research Group:C-MIU
ISSN:1948-5727
ISBN:9781538634257
Copyright Holders:Copyright © 2019 IEEE
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
190579Ultrasonic Needles based on Mn-doped Ternary PiezocrystalsMargaret LucasEngineering and Physical Sciences Research Council (EPSRC)EP/K020013/1ENG - Systems Power & Energy

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