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Accepted (AM)Open Access (License Unspecified), Open
Journal article
Optimization of un-tethered, low voltage, 20–100kHz flexural transducers for biomedical ultrasonics applications
Ultrasonics, v 52(7), pp 943-948
Sep 2012
PMID: 22513259
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
► Low frequency, low intensity, low profile ultrasound transducer.
► Optimization procedure of transducer, allowing low voltage operation.
► Battery operated, portable, wearable therapeutic ultrasound transducer.
► Several therapeutic applications, due to small size and portable operation.
This paper describes optimization of un-tethered, low voltage, 20–100kHz flexural transducers for biomedical ultrasonics applications. The goal of this work was to design a fully wearable, low weight (<100g), battery operated, piezoelectric ultrasound applicator providing maximum output pressure amplitude at the minimum excitation voltage.
Such implementation of ultrasound applicators that can operate at the excitation voltages on the order of only 10–25V is needed in view of the emerging evidence that spatial-peak temporal-peak ultrasound intensity (ISPTP) on the order of 100mW/cm2 delivered at frequencies below 100kHz can have beneficial therapeutic effects. The beneficial therapeutic applications include wound management of chronic ulcers and non-invasive transdermal delivery of insulin and liposome encapsulated drugs.
The early prototypes of the 20 and 100kHz applicators were optimized using the maximum electrical power transfer theorem, which required a punctilious analysis of the complex impedance of the piezoelectric disks mounted in appropriately shaped metal housings.
In the implementation tested, the optimized ultrasound transducer applicators were driven by portable, customized electronics, which controlled the excitation voltage amplitude and facilitated operation in continuous wave (CW) or pulsed mode with adjustable (10–90%) duty cycle. The driver unit was powered by remotely located rechargeable lithium (Li) polymer batteries. This was done to further minimize the weight of the applicator unit making it wearable. With DC voltage of approximately 15V the prototypes were capable of delivering pressure amplitudes of about 55kPa or 100mW/cm2 (ISPTP). This level of acoustic output was chosen as it is considered safe and side effects free, even at prolonged exposure.
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Details
- Title
- Optimization of un-tethered, low voltage, 20–100kHz flexural transducers for biomedical ultrasonics applications
- Creators
- Youhan Sunny - Drexel UniversityChristopher R. Bawiec - Drexel UniversityAn T. Nguyen - Drexel UniversityJoshua A. Samuels - Drexel UniversityMichael S. Weingarten - Drexel UniversityLeonid A. Zubkov - Drexel UniversityPeter A. Lewin - Drexel University
- Publication Details
- Ultrasonics, v 52(7), pp 943-948
- Publisher
- Elsevier
- Number of pages
- 6
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- MD (Doctor of Medicine) Program; School of Biomedical Engineering, Science, and Health Systems
- Web of Science ID
- WOS:000306129200019
- Scopus ID
- 2-s2.0-84863718300
- Other Identifier
- 991019168425604721
UN Sustainable Development Goals (SDGs)
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Acoustics
- Radiology, Nuclear Medicine & Medical Imaging