Document Detail

Finite element static displacement optimization of 20-100 kHz flexural transducers for fully portable ultrasound applicator.
MedLine Citation:
PMID:  23040829     Owner:  NLM     Status:  MEDLINE    
This paper focuses on the development of a finite-element model and subsequent stationary analysis performed to optimize individual flexural piezoelectric elements for operation in the frequency range of 20-100kHz. These elements form the basic building blocks of a viable, un-tethered, and portable ultrasound applicator that can produce intensities on the order of 100mW/cm(2) spatial-peak temporal-peak (I(SPTP)) with minimum (on the order of 15V) excitation voltage. The ultrasound applicator can be constructed with different numbers of individual transducer elements and different geometries such that its footprint or active area is adjustable. The primary motivation behind this research was to develop a tether-free, battery operated, fully portable ultrasound applicator for therapeutic applications such as wound healing and non-invasive transdermal delivery of both naked and encapsulated drugs. It is shown that careful selection of the components determining applicator architecture allows the displacement amplitude to be maximized for a specific frequency of operation. The work described here used the finite-element analysis software COMSOL to identify the geometry and material properties that permit the applicator's design to be optimized. By minimizing the excitation voltage required to achieve the desired output (100mW/cm(2)I(SPTP)) the power source (rechargeable Li-Polymer batteries) size may be reduced permitting both the electronics and ultrasound applicator to fit in a wearable housing.
Christopher R Bawiec; Youhan Sunny; An T Nguyen; Joshua A Samuels; Michael S Weingarten; Leonid A Zubkov; Peter A Lewin
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2012-09-14
Journal Detail:
Title:  Ultrasonics     Volume:  53     ISSN:  1874-9968     ISO Abbreviation:  Ultrasonics     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2012-11-29     Completed Date:  2013-01-24     Revised Date:  2014-06-24    
Medline Journal Info:
Nlm Unique ID:  0050452     Medline TA:  Ultrasonics     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  511-7     Citation Subset:  IM    
Copyright Information:
Copyright © 2012. Published by Elsevier B.V.
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MeSH Terms
Finite Element Analysis
Ultrasonic Therapy / instrumentation*
Grant Support
5 R01 RB009670//PHS HHS; R01 EB009670/EB/NIBIB NIH HHS

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