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http://dx.doi.org/10.7317/pk.2014.38.3.351

Physical Properties of Covered Stent in Gastric Acid Environment: In Vitro Study  

Park, Sung Chul (Department of Internal Medicine, Kangwon National University School of Medicine)
Park, Nark-Soon (Department of Internal Medicine, Korea University College of Medicine)
Kim, Dong-Gon (Utah-inha DDS & Advanced Therapeutics Research Center)
Nah, Jae-Woon (Department of Polymer Science and Engineering, Sunchon National University)
Jeen, Yoon Tae (Department of Internal Medicine, Korea University College of Medicine)
Cho, Hye Jin (Department of Internal Medicine, Korea University College of Medicine)
Kim, Eun Sun (Department of Internal Medicine, Korea University College of Medicine)
Keum, Bora (Department of Internal Medicine, Korea University College of Medicine)
Seo, Yeon Seok (Department of Internal Medicine, Korea University College of Medicine)
Lee, Hong Sik (Department of Internal Medicine, Korea University College of Medicine)
Chun, Hoon Jai (Department of Internal Medicine, Korea University College of Medicine)
Um, Soon Ho (Department of Internal Medicine, Korea University College of Medicine)
Kim, Chang Duck (Department of Internal Medicine, Korea University College of Medicine)
Ryu, Ho Sang (Department of Internal Medicine, Korea University College of Medicine)
Publication Information
Polymer(Korea) / v.38, no.3, 2014 , pp. 351-357 More about this Journal
Abstract
In membrane covered stent, occlusion and fracture from membrane degradation by gastric acid sometimes occurred. Therefore, we investigated the physical properties of membrane covered stent according to its ingredient and concentration in gastric acid environment. Membrane covered stents consisted of silicone and polyurethane with 15%, 18%, 20% concentrations were used. After incubating stents in a condition of pH 1.2, we checked any changes at every 3 weeks for 18 weeks. The changes of membrane surface, radial expansion and recovery force of stent were investigated. Coating thickness increased proportionally to an increase in ingredient concentration. Surface was evenly coated with silicone compared to the case with polyurethane and its homogeneity was excellent in a high concentration. Degradation was much severe in the case of polyurethane. The radial force of silicone was higher than polyurethane, and the decrease of radial and recovery force was higher in the case of polyurethane. In conclusion, high concentration of silicone membrane was more stable than polyurethane in acid environment of in vitro study.
Keywords
covered stent; physical property; gastric acid; silicone; polyurethane;
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