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- Title
Technical feasibility and tissue reaction after silicone-covered biodegradable magnesium stent insertion in the oesophagus: a primary study in vitro and in vivo.
- Authors
Zhu, Yue-Qi; Edmonds, Laura; Wei, Li-Ming; Zheng, Rei-La; Cheng, Ruo-Yu; Cui, Wen-Guo; Cheng, Ying-Sheng
- Abstract
<bold>Objectives: </bold>Determine the feasibility of and tissue response to biodegradable magnesium-silicone stent insertion into the oesophagus of rabbits.<bold>Methods: </bold>Mechanical compression-recovery and degradation behaviours of the stents were investigated in vitro. Thirty rabbits were randomly divided into a magnesium-silicone stent group (n = 15) that received stent insertion into the lower 1/3 of the oesophagus under fluoroscopic guidance and a control group (n = 15). Oesophagography was performed at 1, 2 and 4 weeks. Five rabbits in each group were euthanized at each time point for histological examination.<bold>Results: </bold>Magnesium-silicone stents showed good flexibility and elasticity, and degraded more slowly than bare stents at pH 4.0 and 7.4. All stent insertions were well tolerated. The oesophageal diameters at 1, 2 and 4 weeks were 9.7 ± 0.7, 9.6 ± 0.8 and 9.6 ± 0.5 mm, respectively (vs. 9.2 ± 0.8 mm before intervention; P > 0.05). Stent migration occurred in six rabbits (one at 1 week, one at 2 and four at 4). Microscopy demonstrated dilation of the oesophageal wall within 1 week of insertion. Oesophageal injury and collagen deposition following stent insertion were similar to control (P > 0.05).<bold>Conclusions: </bold>Oesophageal magnesium-silicone stent insertion was feasible and provided reliable support for 2 weeks without causing oesophageal injury or collagen deposition.<bold>Key Points: </bold>• Mg stent provided apparently adequate radial force and silicone membrane reduced magnesium biodegradation • Stent insertion provided good support for at least 2 weeks before biodegradation • Stenting effectively resulted in oesophageal wall remodelling, without demonstrable injury.
- Subjects
SURGICAL stents; ESOPHAGUS; DRUG-eluting stents; RABBITS; ESOPHAGEAL injuries; ESOPHAGEAL surgery; ANIMAL experimentation; ANIMALS; MAGNESIUM; PROSTHETICS; STATISTICAL sampling; SILICONES; PILOT projects; RANDOMIZED controlled trials; FOREIGN body migration; IN vitro studies
- Publication
European Radiology, 2017, Vol 27, Issue 6, p2546
- ISSN
0938-7994
- Publication type
journal article
- DOI
10.1007/s00330-016-4602-1