A longitudinal-torsional mode ultrasonic needle for deep penetration into bone

Cleary, R. , Wallace, R., Simpson, H., Kontorinis, G. and Lucas, M. (2022) A longitudinal-torsional mode ultrasonic needle for deep penetration into bone. Ultrasonics, 124, 106756. (doi: 10.1016/j.ultras.2022.106756) (PMID:35597040)

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This work presents a longitudinal-torsional (L-T) composite mode ultrasonic needle device for deep bone penetration. The L-T needle is a geometrically modified version of an L-mode needle whose efficacy as a prototype ultrasonic bone biopsy device has been previously demonstrated by the authors. Finite element analysis (FEA) aided in the design of the L-T needle, with the aim of maximising the achievable torsional displacement while matching the longitudinal displacement achieved by the L-mode needle. Experimental modal analysis (EMA) of the fabricated ultrasonic device was used to identify the modal parameters and validate the FEA model. Harmonic analysis then provided an insight into how the inherent nonlinearities of the high-power transducer are affected by incorporating the geometrical features that degenerate the L mode into an L-T mode. High power characterisation shows that the longitudinal displacement amplitude of the L-T mode needle is larger than that of the L-mode needle. Comparative penetration tests in fresh Wistar rat skull were evaluated by investigating cell death and cell survival. The region of statistically significant cell death was small for both devices, with the combined axial and shear motion of the L-T device causing increased osteocyte necrosis within this region. Nevertheless, the results suggest a promising environment for post-operative healing. It is shown how this technology offers a potential technique for a surgical approach to the petrous apex, an application that requires a deep penetration into bone.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Cleary, Ms Rebecca and Kontorinis, Mr Georgios and Lucas, Professor Margaret
Authors: Cleary, R., Wallace, R., Simpson, H., Kontorinis, G., and Lucas, M.
College/School:College of Medical Veterinary and Life Sciences > School of Medicine, Dentistry & Nursing
College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Ultrasonics
ISSN (Online):1874-9968
Published Online:06 May 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in Ultrasonics 124: 106756
Publisher Policy:Reproduced under a Creative Commons License

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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
300671Surgery enabled by ultrasonicsMargaret LucasEngineering and Physical Sciences Research Council (EPSRC)EP/R045291/1ENG - Systems Power & Energy