Viscoelastic memory and self-expansion of self-reinforced bioabsorbable stents

Välimaa, Tero; Laaksovirta, Susanna; Tammela, Teuvo L.J.; Laippala, Pékka; Talja, Martti; Isotalo, Taina; Pétas, Anssi; Taari, Kimmo; Törmälä, Pertti

doi:10.1016/s0142-9612(02)00076-5

Cited by 25 publications

(19 citation statements)

References 16 publications

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“…The level at which the expansion stops and the speed of expansion depend on the material, crystallinity, internal arrangement of molecular chains, initial diameter of the spiral, diameter of the stent wire and annealing temperature. The expansion rate can be estimated by a logarithmic equation if the material, draw ratio and diameter of the stent wire are constant [20]. The expansion of the stent to its final diameter may take 5 min to 2 weeks [19,20].…”

Section: Manufacturing Mechanical Properties and Degradation Of Sr Cmentioning

confidence: 99%

“…The expansion rate can be estimated by a logarithmic equation if the material, draw ratio and diameter of the stent wire are constant [20]. The expansion of the stent to its final diameter may take 5 min to 2 weeks [19,20]. In most urological indications rapid expansion would be preferable (Fig.…”

Section: Manufacturing Mechanical Properties and Degradation Of Sr Cmentioning

confidence: 99%

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Biodegradable urethral stents

Tammela¹,

Talja²

2003

BJU International

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Section: Manufacturing Mechanical Properties and Degradation Of Sr Cmentioning

confidence: 99%

Section: Manufacturing Mechanical Properties and Degradation Of Sr Cmentioning

confidence: 99%

Biodegradable urethral stents

Tammela¹,

Talja²

2003

BJU International

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“…The presence of any additives or contaminants is to be avoided because they can either leach out of the polymer after implantation or change mechanical characteristics. It also has been shown that specific processing conditions can generate self‐deployment and negate the natural elastic recoil of plastic stents 32, 49. The design is another crucial factor that conditions the behaviour of a stent.…”

Section: Introductionmentioning

confidence: 99%

Chiral gas chromatography as a tool for investigations into illicitly manufactured methylamphetamine

et al. 2011

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The aim of this study was to develop a chiral gas chromatographic method for the separation of compounds likely to be found in the EMDE synthesis of methylamphetamine, a heavily abused stimulant drug. Here we describe the separation of the enantiomers of ephedrine, pseudoephedrine, chlorinated intermediates and methylamphetamine using fluorinated acid anhydrides as chemical derivatization reagents prior to gas chromatographic analysis on a 2,3-di-O-methyl-6-t-butyl silyl-β-cyclodextrin stationary phase (CHIRALDEX™ B-DM). Separation of the enantiomers of pseudoephedrine, methylamphetamine and chloro-intermediates was achieved using PFPA derivatization, and enantiomers of ephedrine using TFAA derivatization, in run times of less than 40 minutes. The use of HFBA as a derivatization reagent for this set of analytes is also discussed.

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“…In vitro studies showed appropriate mechanical properties as well as positive recoil (or continuous expansion) of PLA96 stents 31, 32…”

Section: Introductionmentioning

confidence: 99%