Viscoelastic memory and self-expansion of self-reinforced bioabsorbable stents
| Autor: | Kimmo Taari, T. Isotalo, Pekka Laippala, Tero Välimaa, Anssi Petas, Susanna Laaksovirta, Pertti Törmälä, Teuvo L.J. Tammela, Martti Talja |
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| Rok vydání: | 2002 |
| Předmět: |
Male
Materials science Expansion rate Annealing (metallurgy) Polymers medicine.medical_treatment Polyesters Physics::Medical Physics 030232 urology & nephrology Biophysics Bioengineering Biocompatible Materials 02 engineering and technology In Vitro Techniques Viscoelasticity Self reinforced Biomaterials 03 medical and health sciences Draw ratio 0302 clinical medicine Polylactic Acid-Polyglycolic Acid Copolymer Materials Testing medicine Forensic engineering Animals Humans Lactic Acid Composite material Self expansion Viscosity Prostate Temperature Stent 021001 nanoscience & nanotechnology Elasticity Mechanics of Materials Ceramics and Composites Stents 0210 nano-technology Polyglycolic Acid |
| Zdroj: | Biomaterials. 23(17) |
| ISSN: | 0142-9612 |
| Popis: | The possibility to decide the speed and rate of expansion of stents is of great clinical importance by reason of the varying requirements for different indications to use stents. Self-reinforced bioabsorbable stents can be made self-expanding owing to the viscoelastic memory of the material. Stents are stable at room temperature and expansion occurs at body temperature. The level at which the expansion stops depends on the material, crystallinity, initial diameter of spiral and annealing temperature. The expansion rate can be estimated by logarithmic equation, if material, draw ratio and diameter of stent wire are constant. This is, however, possible only if processing parameters are constant. Based on the present results annealing temperature and expansion time were seen to be directly proportional to the expansion rate of the stent. |
| Databáze: | OpenAIRE |
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