Document Detail

Spherical rotary piston machine as an artificial heart.
MedLine Citation:
PMID:  1751131     Owner:  NLM     Status:  MEDLINE    
A positive displacement pump with six rotary pistons was proposed as an artificial heart. The pump's design was characterized by high symmetry and compactness. Thus, a spherical volume of 4 1/4 inch diameter sufficed for a pump delivering 10 L/min at 120 pulses/min with the pistons turning at 30 rpm. The pistons and four connecting gears were the only moving parts. The pump functions in two separate halves as left and right ventricles, with two of the six pistons each having inlet and outlet passages, and one of them replacing mitral and pulmonary valves with the other, tricuspid and aortic valves. The function of the intraventricular septum was provided by the other four pistons whose interiors also accommodated driving motors each capable of 0.4 Nm torque for a combined power of 5 watts. There were no stagnant regions in the pumping volume, and at all internal surfaces in contact with blood, there was periodic shear stress not exceeding approximately 300 Pa.
S L Wipf
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  ASAIO transactions / American Society for Artificial Internal Organs     Volume:  37     ISSN:  0889-7190     ISO Abbreviation:  ASAIO Trans     Publication Date:    1991 Jul-Sep
Date Detail:
Created Date:  1992-01-29     Completed Date:  1992-01-29     Revised Date:  2005-11-17    
Medline Journal Info:
Nlm Unique ID:  8611947     Medline TA:  ASAIO Trans     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  M246-7     Citation Subset:  IM    
DESY, Hamburg, Germany.
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MeSH Terms
Biocompatible Materials
Electric Power Supplies
Heart, Artificial*
Prosthesis Design
Reg. No./Substance:
0/Biocompatible Materials

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