To investigate the effect of targeted overdilation in balloon-expandable stents

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Purpose: Balloon-expandable stents are commonly used for the treatment of tracheobron-chial strictures. We routinely perform targeted overdilation of these stents 1–2mm on initial deployment to prevent stent migration or allow foreshortening to target airway caliber; however, specific data on the effect of targeted overdilation is unknown. Patients and Methods: We used three iCAST stents (6×22mm, 7×22mm, and 10×38mm) to perform the study. We had two sets of each size to average our results. Targeted over-dilation was accomplished with Merit Elation balloons. Results: The 6 × 22 and 7 × 22 stent OD increased from 6 to 11.4mm and 7 to 11.6mm. The 10 × 38 stent demonstrated minimal OD change with overdilation (OD change of 10.4 to 12.2mm). All stents demonstrated significant foreshortening with overdilation (20.2 to 5.65mm, 19.4 to 6mm, and 30.9 to 10.2mm for 6 × 22, 7 × 22, and 10 × 38, respectively). The breakpoint was seen at near twice the stated stent OD (13.5mm, 15mm, and 15mm with 6 × 22, 7 × 22 and 10 × 38, respectively). Conclusion: We have demonstrated that iCAST stents can increase their OD with subse-quent foreshortening during targeted overdilation. This data can help facilitate decisions when selecting a particular iCAST stent for a specific airway application. Additionally, we have highlighted that balloon inflation diameter does not correspond to the actual stent OD during deployment. We believe that this data offers practical information for end-users of this stent type and additional data will be needed to corroborate our findings.

Original languageEnglish (US)
Pages (from-to)321-325
Number of pages5
JournalMedical Devices: Evidence and Research
StatePublished - 2021

Bibliographical note

Funding Information:
We thank the Atrium Medical Corporation for donating these stents for scientific research.

Publisher Copyright:
© 2021 Wong et al.


  • Airway balloon dilation
  • Airway stenosis
  • Airway stent
  • Balloon expandable stent
  • Interventional pulmonary
  • Tracheobronchial disease


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