Physical Properties of Covered Stent in Gastric Acid Environment: In Vitro Study
- Park, Sung Chul; Park, Nark-Soon; Kim, Dong-Gon; Nah, Jae-Woon; Jeen, Yoon Tae; Cho, Hye Jin; Kim, Eun Sun; Keum, Bora; Seo, Yeon Seok; Lee, Hong Sik; Chun, Hoon Jai; Um, Soon Ho; Kim, Chang Duck; Ryu, Ho Sang
- Issue Date
- POLYMER SOC KOREA
- covered stent; physical property; gastric acid; silicone; polyurethane
- POLYMER-KOREA, v.38, no.3, pp.351 - 357
- Journal Title
- Start Page
- End Page
- 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.
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- 2. Clinical Science > Department of Internal Medicine > 1. Journal Articles
- 5. Others > Others(Medicine) > 1. Journal Articles
- 2. Clinical Science > Department of Gastroenterology and Hepatology > 1. Journal Articles
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