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In vivo degradation of copolymers prepared from l-lactide, 1,3-trimethylene carbonate and glycolide as coronary stent materials

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Abstract

A series of high molecular weight polymers were prepared by ring opening polymerization of l-lactide (l-LA), 1,3-trimethylene carbonate (TMC) and glycolide using stannous octoate as catalyst. The resulting polymers were characterized by gel permeation chromatography, 1H nuclear magnetic resonance, differential scanning calorimeter and tensile tests. All the polymers present high molecular weights. Compared with PLLA and PTLA copolymers, the terpolymers exhibit interesting properties such as improved toughness and lowered crystallinity with only slightly reduced mechanical strength. In vivo degradation was performed by subcutaneous implantation in rats to evaluate the potential of the copolymers as bioresorbable coronary stent material. The results show that all the polymers conserved to a large extent their mechanical properties during the first 90 days, except the strain at break which exhibited a strong decrease. Meanwhile, significant molecular weight decrease and weight loss are detected in the case of terpolymers. Therefore, the PTLGA terpolymers present a good potential for the development of totally bioresorbable coronary stents.

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Acknowledgments

The authors acknowledge the National Natural Science Foundation of China (No. 51073041) for financial support.

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Authors and Affiliations

  1. Department of Materials Science, Fudan University, 220 Handan Road, Shanghai, 200433, People’s Republic of China

    Yuan Yuan, Xiaoyun Jin & Zhongyong Fan

  2. Institut Europeen des Membranes, UMR CNRS 5635, Universite Montpellier 2, 34095, Montpellier, France

    Suming Li

  3. Department of Cardio-thoracic Surgery, Shanghai Sixth People’s Hospital, Affiliated Shanghai Jiao Tong University School of Medicine, Shanghai, 200233, People’s Republic of China

    Zhiqian Lu

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  1. Yuan Yuan
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Correspondence to Zhongyong Fan or Suming Li.

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Yuan, Y., Jin, X., Fan, Z. et al. In vivo degradation of copolymers prepared from l-lactide, 1,3-trimethylene carbonate and glycolide as coronary stent materials. J Mater Sci: Mater Med 26, 139 (2015). https://doi.org/10.1007/s10856-015-5384-8

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