@article {18037,
	title = {Bioresorbable ureteral stents from natural origin polymers},
	journal = {Journal of Biomedical Materials Research Part B: Applied Biomaterials},
	volume = {0000},
	year = {2014},
	month = {2014-06-05 00:00:00},
	pages = {0000},
	edition = {000},
	abstract = {

In this work, stents were produced from natural origin\ polysaccharides. Alginate, gellan gum, and a blend of\ these with gelatin were used to produce hollow tube (stents)\ following a combination of templated gelation and critical\ point carbon dioxide drying. Morphological analysis of the\ surface of the stents was carried out by scanning electron\ microscopy. Indwelling time, encrustation, and stability of\ the stents in artificial urine solution was carried out up to 60\ days of immersion. In vitro studies carried out with simulated\ urine demonstrated that the tubes present a high fluid uptake\ ability, about 1000\%. Despite this, the materials are able to\ maintain their shape and do not present an extensive swelling\ behavior. The bioresorption profile was observed to be\ highly dependent on the composition of the stent and it can\ be tuned. Complete dissolution of the materials may occur\ between 14 and 60 days. Additionally, no encrustation was\ observed within the tested timeframe. The ability to resist\ bacterial adherence was evaluated with Gram-positive Staphylococcus
aureus and two Gram-negatives Escherichia coli\ DH5 alpha and Klebsiella oxytoca. For K. oxytoca, no differences\ were observed in comparison with a commercial\ stent (BiosoftVR duo, Porges), although, for S. aureus all\ tested compositions had a higher inhibition of bacterial\ adhesion compared to the commercial stents. In case of\ E. coli, the addition of gelatin to the formulations reduced\ the bacterial adhesion in a highly significant manner compared\ to the commercial stents. The stents produced by the\ developed technology fulfill the requirements for ureteral\ stents and will contribute in the development of biocompatible
and bioresorbable urinary stents.

}, keywords = {bioresorbable, natural origin polymers, ureteral stents}, doi = {10.1002/jbm.b.33237}, url = {http://onlinelibrary.wiley.com/doi/10.1002/jbm.b.33237/pdf}, author = {Barros, A. A. and Duarte, A. R. C. and Pires, R. A. and Lima, E. and Mano, J. F. and Reis, R. L.} }

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