[Study on mechanical properties of through-the-scope airway stents and complications caused by TTS airway stents in rabbits trachea].

The TTS(through-the-scope)airway stent is a novel self-expanding nitinol alloy metal stent. Its structure and method of implantation differ significantly from those of the traditional OTW(over-the-wire)stent. In this study, we compared the mechanical properties of the TTS and OTW stents, and both of which were implanted into the tracheas of rabbits to compare the differences in complications caused by these two types of stents. The results indicate that the radial force of the TTS stent is stronger than, or at least comparable to, that of the OTW stent, and that the TTS stent has superior axial compliance. Both TTS and OTW stent can trigger airway inflammatory responses, and the incidence of stent-related complications caused by TTS and OTW stents is similar. However, the degree of granulation tissue hyperplasia caused by TTS stent is less than that caused by the OTW stent.