Stents for colorectal obstruction: Past, present, and future

Table 1 Comparison of efficacy and complication of stent by type (covered stent vs uncovered stent)

Study	No. of patients	Stent	Indication	Mean age	Covering material	Patency duration between stent types	Complication
Kang et al[6]	26	Not reported	Palliation/BTS	58.0	Fully/Partially (polyurethane)	No difference	More migration in fully covered stent group
Choi et al[7]	74	Choo stent™	Palliation	60.0	Fully/Partially (polyurethane)	No difference	More migration in covered stent group
Lee et al[2]	80	Niti-S™	Palliation/BTS	63.3	Partially (polyurethane)	No difference	More migration in covered stent group
Park et al[3]	151	WallFlex™	Palliation/BTS	61.4	Partially (polytetrafluoroethylene)	No difference	More tumor ingrowth in uncovered stent group/more migration in covered stent group
		Comvi™
Moon et al[4]	68	Niti-S™ D-type	Palliation/BTS	65.8	Partially (polytetrafluoroethylene)	No difference	More migration in covered stent group
		Comvi™
Park et al[8]	103	Wallstent™	Palliation	67.3	Partially (polytetrafluoroethylene or silicon)	No difference	No difference between stent types/variable migration rates between manufacturers
		Niti-S™
		Bonastent™
		Hanarostent™
Choi et al[9]	152	Niti-S™	Palliation/BTS	70.0	Not reported	No difference	More migration and perforation in covered stent group
		Hanarostent™
		Choo stent™
		Bonastent™

BTS: Bridge to surgery; No: Number; PS: Prospective study; RS: Retrospective study.