Document Detail


Acoustic and visual characteristics of cavitation induced by mechanical heart valves.
MedLine Citation:
PMID:  16116884     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND AND AIM OF THE STUDY: A sudden pressure drop and recovery can induce cavitation in liquids. Mechanical heart valves (MHVs) generate such a pressure drop at closure, and cavitation generation around MHVs has been demonstrated many times. Cavitation is suspected as being a cause of blood and valve material damage. METHODS: In this in-vitro experiment, visual images and acoustic signals associated with MHV cavitation were studied to reveal cavitation characteristics. Björk-Shiley Convex-Concave valves, one with a pyrolytic carbon occluder and one with a Delrin occluder, were installed in a single-shot valve chamber. Cavitation intensity was controlled by load (dP/dt) and air content of water. The acoustic signal was measured using a hydrophone and visual images recorded with a high-speed digital camera system. RESULTS: Cavitation images showed that 10 ppm water rarely developed cavitation, unlike the 16 ppm water. A distinct peak pressure was observed at cavitation collapse that was a good indicator of MHV cavitation intensity. The average of the peak pressures revealed that cavitation intensity increased faster with increasing load for the 16 ppm water. CONCLUSION: The use of the peak pressure may be the preferred method for correlating cavitation intensity in structures for which the separation of valve closure noise and cavitation signal is difficult, as for the valves studied here.
Authors:
Kwanghyun Sohn; Keefe B Manning; Arnold A Fontaine; John M Tarbell; Steven Deutsch
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Journal of heart valve disease     Volume:  14     ISSN:  0966-8519     ISO Abbreviation:  J. Heart Valve Dis.     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-08-24     Completed Date:  2005-12-19     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  9312096     Medline TA:  J Heart Valve Dis     Country:  England    
Other Details:
Languages:  eng     Pagination:  551-8     Citation Subset:  IM    
Affiliation:
The Pennsylvania State University, Department of Bioengineering, 205 Hallowell Building, University Park, PA 16802, USA.
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MeSH Terms
Descriptor/Qualifier:
Acoustics*
Biocompatible Materials
Carbon
Heart Valve Prosthesis*
Hemorheology*
Humans
Image Processing, Computer-Assisted
Materials Testing
Models, Cardiovascular*
Photography
Pressure
Prosthesis Design
Resins, Synthetic
Signal Processing, Computer-Assisted
Water
Grant Support
ID/Acronym/Agency:
HL 48652/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Biocompatible Materials; 0/Resins, Synthetic; 0/pyrolytic carbon; 7440-44-0/Carbon; 7732-18-5/Water; 9085-38-5/delrin

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