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To Investigate the Effect of Targeted Overdilation in Balloon-Expandable Stents
Jennifer Wong1, Elliot Backer1, Joseph C Keenan1
1Interventional Pulmonology Division, Department of Pulmonary, Allergy, Critical Care and Sleep Medicine, University of Minnesota, Minneapolis, MN, USA.
Medical Devices (Auckland, N.Z.)
|November 5, 2021
Summary
Targeted overdilation of iCAST stents increases outer diameter and significantly shortens length, aiding airway stricture treatment. Balloon inflation diameter does not directly correlate with final stent outer diameter.
Area of Science:
- Interventional Pulmonology
- Biomedical Engineering
- Medical Device Technology
Background:
- Balloon-expandable stents are crucial for treating tracheobronchial strictures.
- Routine targeted overdilation aims to prevent migration and achieve target airway caliber.
- Specific data on the effects of targeted overdilation on iCAST stents is lacking.
Purpose of the Study:
- To evaluate the impact of targeted overdilation on iCAST stent dimensions.
- To assess the foreshortening effect of overdilation on different iCAST stent sizes.
- To determine the relationship between balloon inflation diameter and final stent outer diameter.
Main Methods:
- Three sizes of iCAST stents (6×22mm, 7×22mm, 10×38mm) were used.
- Targeted overdilation was performed using Merit Elation balloons.
- Measurements of outer diameter and length changes were recorded before and after overdilation.
Main Results:
- Overdilation increased outer diameter for 6×22mm and 7×22mm stents (to 11.4mm and 11.6mm, respectively).
- The 10×38mm stent showed a smaller outer diameter increase (to 12.2mm).
- Significant foreshortening occurred across all stent sizes (e.g., 30.9mm to 10.2mm for 10×38mm).
Conclusions:
- iCAST stents undergo significant outer diameter increase and length reduction with targeted overdilation.
- Findings provide practical data for selecting iCAST stents for specific airway applications.
- Balloon inflation diameter is not a direct predictor of final stent outer diameter.
