Patients with malignant stricture were implanted with covered metallic segmented stent modified with 3D printing.

The airway stents modified with 3D printing were implanted to treat malignant stricture involving carina and bronchi distal to carina.

Hugh-Jones classication: dyspnea scale that includes 5 categories.

Stent patency time is defined as the time from the stent implantation to stent restenosis or death due to any cause, or censored at date last known alive.

OS is defined as the time from the stent implantation to death due to any cause, or censored at date last known alive.

Adverse events as follows: migration of the stent, severe chest pain, hemoptysis, granuloma formation, pneumonia and accumulation of secretion