Table of Contents
Polymers, Volume 10, Issue 3 (March 2018)
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Cover Story (view full-size image) A key step in the manufacture of bioresorbable vascular scaffolds (BVSs) for treatment of coronary [...] Read more. A key step in the manufacture of bioresorbable vascular scaffolds (BVSs) for treatment of coronary heart disease is "stretch blow molding", which expands a nearly amorphous poly L-lactide (PLLA)-extruded tube from an outer diameter (OD) of 1.5 mm to an OD of 3.6 mm with a final wall thickness of ~150 µm. A new instrument probes the rate and morphology of PLLA crystallization during (center pattern, 45% OD-strain, t=70 s) and after (lower right, 350 s; after elongation ceases at 150% OD-strain, 100 s) azimuthal elongation using in situ X-ray scattering. Control of crystallinity may enable thinner scaffolds (~80 µm instead of ~150 µm) to facilitate implantation and improve outcomes. View the paper