Document Detail


Flow visualization in an artificial heart using diffuse and planar laser lighting.
MedLine Citation:
PMID:  3196528     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of the study was to characterize flow properties within a clinical pusher plate type artificial heart. Dual camera video tape and synchronized still photographs were used to study flow patterns. Diffused light and a planar laser source provided illumination. The laser light was turned into a plane of light with a thickness varying from 0.1 to 10 mm, and magnesium oxide and Amberlite particles were used as tracers. Qualitative and quantitative analyses were performed by the examination and digitization of flow patterns. Inflow, outflow, pneumatic drive and after-load pressure, diaphragm motion, cardiac output, and heart rate were measured and recorded. An electrical circuit was developed to synchronize pump diaphragm motion with captured images of flow trajectories. Trajectories were then digitized, and velocities, turbulence, and shear stresses were calculated. As the result of these experiments, disturbed, recirculating, and stagnation zones were identified and global and local turbulence values were determined. Simultaneous turbulence, stasis, recirculation, and laminar flow patterns were observed during most phases of the pumping cycle. Velocities obtained varied from 2 cm/sec to 145 cm/sec; total local shear stresses of 12 to 897 dynes/cm2 were seen.
Authors:
T Mussivand; R Navarro; J F Chen; J Braun; H Harasaki; R Kiraly; C Batur; C McMillin; Y Nosé
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  ASAIO transactions / American Society for Artificial Internal Organs     Volume:  34     ISSN:  0889-7190     ISO Abbreviation:  ASAIO Trans     Publication Date:    1988 Jul-Sep
Date Detail:
Created Date:  1989-01-26     Completed Date:  1989-01-26     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8611947     Medline TA:  ASAIO Trans     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  317-21     Citation Subset:  IM    
Affiliation:
Department of Artifical Organs, Cleveland Clinic Foundation, OH 44106.
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MeSH Terms
Descriptor/Qualifier:
Blood Flow Velocity*
Cardiac Output
Heart Rate
Heart, Artificial*
Image Processing, Computer-Assisted*
Lasers*
Magnesium Oxide / diagnostic use
Resins, Synthetic / diagnostic use
Rheology
Stroke Volume
Grant Support
ID/Acronym/Agency:
N01-HV-28001/HV/NHLBI NIH HHS; N01-HV-48007/HV/NHLBI NIH HHS; N01-HV-88103/HV/NHLBI NIH HHS
Chemical
Reg. No./Substance:
0/Resins, Synthetic; 1309-48-4/Magnesium Oxide; 9079-25-8/amberlite

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


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