Document Detail


Engineering analysis of the effects of bulging sinuses in a newly designed pediatric pulmonary heart valve on hemodynamic function.
MedLine Citation:
PMID:  21956206     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The purpose of this study was to examine the hemodynamic characteristics of expanded polytetrafluoroethylene (ePTFE) pulmonary valves with bulging sinuses quantitatively in a pediatric pulmonary mechanical circulatory system designed by us, in order to propose the optimal design for clinical applications. In this study, we developed a pediatric pulmonary mock circulation system, which consisted of a pneumatic right ventricular model, a pulmonary heart valve chamber, and a pulmonary elastic compliance tubing with resistive units. The hemodynamic characteristics of four different types of ePTFE valves and a monoleaflet mechanical heart valve were examined. Relationships between the leaflet movements and fluid characteristics were evaluated based on engineering analyses using echocardiography and a high-speed video camera under the pediatric circulatory conditions of the mock system. We successfully performed hemodynamic simulations in our pediatric pulmonary circulatory system that could be useful for quantitatively evaluating the pediatric heart valves. In the simulation study, the ePTFE valve with bulging sinuses exhibited a large eddy in the vicinity of the leaflets, whereas the straight tubing exhibited turbulent flow. The Reynolds number obtained in the valve with bulging sinuses was calculated to be 1667, which was smaller than that in the straight tubing (R (e) = 2454).The hemodynamic characteristics of ePTFE pediatric pulmonary heart valves were examined in our mock circulatory system. The presence of the bulging sinuses in the pulmonary heart valve decreased the hydrodynamic energy loss and increased the systolic opening area. Based on an in vitro experiment, we were able to propose an optimal selection of pulmonary valve design parameters that could yield a more sophisticated pediatric ePTFE valve shape.
Authors:
Ichiro Suzuki; Yasuyuki Shiraishi; Shota Yabe; Yusuke Tsuboko; Telma Keiko Sugai; Ken Matsue; Takeyoshi Kameyama; Yoshifumi Saijo; Takashi Tanaka; Yoshihiro Okamoto; Zhonggang Feng; Takako Miyazaki; Masaaki Yamagishi; Makoto Yoshizawa; Mitsuo Umezu; Tomoyuki Yambe
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-9-29
Journal Detail:
Title:  Journal of artificial organs : the official journal of the Japanese Society for Artificial Organs     Volume:  -     ISSN:  1619-0904     ISO Abbreviation:  -     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-9-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9815648     Medline TA:  J Artif Organs     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Graduate School of Biomedical Engineering, Tohoku University, 4-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, Japan, ichiro-rifle@pop02.odn.ne.jp.
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