Comparison of Covered Laser-cut and Braided Respiratory Stents: From Bench to Pre-Clinical Testing

Anja Lena Thiebes, Donnacha J McGrath, Nicola Kelly, Caoimhe A Sweeney, Kathrin Kurtenbach, Valentine N Gesché, Johanna Clauser, Barry O'Brien, Mark Bruzzi, Peter E McHugh, Stefan Jockenhoevel*, Christian G Cornelissen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Web of Science)

Abstract

Lung cancer patients often suffer from severe airway stenosis, the symptoms of which can be relieved by the implantation of stents. Different respiratory stents are commercially available, but the impact of their mechanical performance on tissue responses is not well understood. Two novel laser-cut and hand-braided nitinol stents, partially covered with polycarbonate urethane, were bench tested and implanted in Rhön sheep for 6 weeks. Bench testing highlighted differences in mechanical behavior: the laser-cut stent showed little foreshortening when crimped to a target diameter of 7.5 mm, whereas the braided stent elongated by more than 50%. Testing also revealed that the laser-cut stent generally exerted higher radial resistive and chronic outward forces than the braided stent, but the latter produced significantly higher radial resistive forces at diameters below 9 mm. No migration was observed for either stent type in vivo. In terms of granulation, most stents exerted a low to medium tissue response with only minimal formation of granulation tissue. We have developed a mechanical and in vivo framework to compare the behavior of different stent designs in a large animal model, providing data, which may be employed to improve current stent designs and to achieve better treatment options for lung cancer patients.

Original languageEnglish
Pages (from-to)1738-1747
Number of pages10
JournalAnnals of Biomedical Engineering
Volume47
Issue number8
Early online date1 May 2019
DOIs
Publication statusPublished - Aug 2019

Keywords

  • AIRWAY
  • Airway stenting
  • Animal trial
  • DESIGN
  • EXPANDABLE METALLIC STENTS
  • Nitinol stent
  • Sheep model
  • Stent development

Cite this