title: Evaluation of mechanical loading of a trileaflet polyurethane blood pump valve by finite element analysis.
abstract: The mechanical loading of the leaflets of a polyurethane blood pump valve at closing pressure (max 300 mmHg) and during the opening phase can be numerically calculated by the finite element method. Geometrical and physical non-linearities, supporting forces by neighbouring leaflets and manufacturing-related thickness distribution are taken into account. The valve housing is assumed to be rigid. Volume forces are neglected. The calculations showed that the critical strain limit of 4.5% (long-term failure limit) was exceeded at closing pressure and during valve opening. During valve operation the connection between leaflet and valve housing and the central leaflet region seem to be the critical areas.
authors.affiliation: Helmholtz-Institute for Biomedical Engineering at the RWTH Aachen, West Germany.
authors.forename: B
authors.initials: B
authors.lastname: Knierbein
authors.forename: U
authors.initials: U
authors.lastname: Mohr-Matuschek
authors.forename: M
authors.initials: M
authors.lastname: Rechlin
authors.forename: H
authors.initials: H
authors.lastname: Reul
authors.forename: G
authors.initials: G
authors.lastname: Rau
authors.forename: W
authors.initials: W
authors.lastname: Michaeli
mesh_terms: D001672:Biocompatible Materials; D006350:Heart Valve Prosthesis; D006353:Heart-Assist Devices; D006801:Humans; D008433:Mathematics; D008955:Models, Cardiovascular; D011140:Polyurethanes; D011312:Pressure; D011474:Prosthesis Design; D013314:Stress, Mechanical
chemical_list: D001672:Biocompatible Materials; D011140:Polyurethanes