Document Detail

Cavitation behavior observed in three monoleaflet mechanical heart valves under accelerated testing conditions.
MedLine Citation:
PMID:  18356649     Owner:  NLM     Status:  MEDLINE    
Accelerated testing provides a substantial amount of data on mechanical heart valve durability in a short period of time, but such conditions may not accurately reflect in vivo performance. Cavitation, which occurs during mechanical heart valve closure when local flow field pressure decreases below vapor pressure, is thought to play a role in valve damage under accelerated conditions. The underlying flow dynamics and mechanisms behind cavitation bubble formation are poorly understood. Under physiologic conditions, random perivalvular cavitation is difficult to capture. We applied accelerated testing at a pulse rate of 600 bpm and transvalvular pressure of 120 mm Hg, with synchronized videographs and high-frequency pressure measurements, to study cavitation of the Medtronic Hall Standard (MHS), Medtronic Hall D-16 (MHD), and Omni Carbon (OC) valves. Results showed cavitation bubbles between 340 and 360 micros after leaflet/housing impact of the MHS, MHD, and OC valves, intensified by significant leaflet rebound. Squeeze flow, Venturi, and water hammer effects each contributed to cavitation, depending on valve design.
Chi-Wen Lo; Jia-Shing Liu; Chi-Pei Li; Po-Chien Lu; Ned H Hwang
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  ASAIO journal (American Society for Artificial Internal Organs : 1992)     Volume:  54     ISSN:  1538-943X     ISO Abbreviation:  ASAIO J.     Publication Date:    2008 Mar-Apr
Date Detail:
Created Date:  2008-03-21     Completed Date:  2008-05-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9204109     Medline TA:  ASAIO J     Country:  United States    
Other Details:
Languages:  eng     Pagination:  163-71     Citation Subset:  IM    
Department of Water Resources and Environmental Engineering, Tamkang University, Taipei, Taiwan.
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MeSH Terms
Blood Flow Velocity
Equipment Failure*
Equipment Failure Analysis*
Heart Valve Prosthesis*
Materials Testing
Prosthesis Design

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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