1,157 research outputs found
Laser beam cutting and welding of coronary stents
Coronary stents are thin-walled and mesh-structured
metallic implants, which are made generally by laser beam
cutting of high-precision tubes of 90-120 micrometer
thickness. The tube material can be 316L stainless steel or
L605 type cobalt-chromium alloy. The paper present how
laser settings influence geometry and surface quality of the
kerf and residual stresses, which play very important role in
the precision of stent strut homogeneity.
Hungarian Tentaur stent was developed 15 years ago. This
coil stent made of 145 micrometers thick stainless steel wire
contains 9-25 joints produced by electric resistance
projection welding. Developments were bringing out for
increasing flexibility of Tentaur stent, and a new design and
a new tech-nology was elaborated, which’s based on laser
beam mi-crowelding. TentaFlex stent also is constructed
from austenitic stainless steel wire, but it does not contain
any wire-crossing joint, because stent struts are configured
from sinusoidal helix. Stent contains only two welded joints
at its ends. Laser welding experiences of these joints are
presented in the paper. A Trumpf PowerWeld Nd:YAG laser
work station was used for welding, and after optimization of
laser settings joints can’t produces from only one side of the
coiled stent
Intelligational and innovation policy of the European union in the context of global competitiveness
Vertex dynamics during domain growth in three-state models
Topological aspects of interfaces are studied by comparing quantitatively the
evolving three-color patterns in three different models, such as the
three-state voter, Potts and extended voter models. The statistical analysis of
some geometrical features allows to explore the role of different elementary
processes during distinct coarsening phenomena in the above models.Comment: 4 pages, 5 figures, to be published in PR
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