| The effect of tip angle on cavitation potential during closure of a bileaflet prosthesis model. | |
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MedLine Citation:
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PMID: 17702370 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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BACKGROUND AND AIM OF THE STUDY: Mechanical heart valve (MHV) cavitation has been widely investigated by negative pressure transient (NPT) measurements. Whilst NPT is believed to be the cause of cavitation as the valve occluder approaches its fully closed position, some valves are also more prone to cavitation initiation. The study aim was to determine the effect of tip angle on the occluder trailing edge for the MHV closure flow field and cavitation potential. METHODS: Three pairs of 1:1 transparent bileaflet models, with different tip angles (30 degrees, 60 degrees and 90 degrees), were used in a pulsatile mock loop. Particle image velocimetry (PIV) and micro-tip pressure catheters were applied respectively for the closure flow and transient pressure investigations. A mechanism was designed to enable triggering when the valve occluder approached its closing position. RESULTS: The transient pressure showed two maximum pressure drops, the magnitudes of which differed with various angle designs. A series of flow fields with continuously narrowing gap channels was captured. Different flow features were demonstrated for the three valve models. CONCLUSION: The tip angle design on the occluder trailing edge affected both the NPT magnitude and MHV closure flow field. The 60 degrees and 30 degrees valves had higher vorticity and fluid deceleration rate within the squeeze flow and occluder sudden stop respectively, which correlated with their larger pressure drops for the first and second NPT peaks. |
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Authors:
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Pei Zhang; Joon Hock Yeo; Ping Qian; Ned H C Hwang |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of heart valve disease Volume: 16 ISSN: 0966-8519 ISO Abbreviation: J. Heart Valve Dis. Publication Date: 2007 Jul |
Date Detail:
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Created Date: 2007-08-17 Completed Date: 2007-10-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9312096 Medline TA: J Heart Valve Dis Country: England |
Other Details:
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Languages: eng Pagination: 430-9 Citation Subset: IM |
Affiliation:
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School of Mechanical & Automation Engineering, Shanghai Institute of Technology, China. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Blood Flow Velocity
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physiology* Equipment Failure Analysis Heart Valve Prosthesis* Hemorheology Humans Models, Cardiovascular Prosthesis Design Pulsatile Flow / physiology* Ventricular Pressure / physiology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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