Wavelet transforms in the analysis of mechanical heart valve cavitation

Journal of Biomechanical Engineering
Luke H HerbertsonSteven Deutsch

Abstract

Cavitation is known to cause blood element damage and may introduce gaseous emboli into the cerebral circulation, increasing the patient's risk of stroke. Discovering methods to reduce the intensity of cavitation induced by mechanical heart valves (MHVs) has long been an area of interest. A novel approach for analyzing MHV cavitation is presented. A wavelet denoising method is explored because currently used analytical techniques fail to suitably unmask the cavitation signal from other valve closing sounds and noise detected with a hydrophone. Wavelet functions are used to denoise the cavitation signal during MHV closure and rebound. The wavelet technique is applied to the signal produced by closure of a 29-mm Medtronic-Hall MHV in degassed water with a gas content of 5 ppm. Valve closing dynamics are investigated under loading conditions of 500, 2500, and 4500 mm Hg/s. The results display a marked improvement in the quantity and quality of information that can be extracted from acoustic cavitation signals using the wavelet technique compared to conventional analytical techniques. Time and frequency data indicate the likelihood and characteristics of cavitation formation under specified conditions. Using this wavelet technique ...Continue Reading

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Citations

Jul 8, 2008·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Hwansung LeeYoshiyuki Taenaka
Dec 3, 2008·Journal of Biomechanical Engineering·Luke H HerbertsonKeefe B Manning
Jan 29, 2011·Biomedical Engineering Online·Véronique Millette, Natalie Baddour
Jun 10, 2009·ASAIO Journal : a Peer-reviewed Journal of the American Society for Artificial Internal Organs·Hwansung LeeYoshiyuki Taenaka
Aug 25, 2009·ASAIO Journal : a Peer-reviewed Journal of the American Society for Artificial Internal Organs·Changfu WuLaurence W Grossman
Jul 11, 2018·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Paul A BrandnerBryce W Pearce
May 15, 2009·The International Journal of Artificial Organs·Andrea BagnoGino Gerosa

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