Stents for colorectal obstruction: Past, present, and future

Table 2 Commercially available colorectal stents

Name	Material	Diameter (mm)	Flare	Flare diameter (mm)	Length (mm)	Covered/uncovered	Feature	Manufacturer
Colonic Z-stent™	Stainless steel	25	A	35	40, 60, 80, 100, 120	Uncovered	No foreshortening	Cook
Evolution™	Nitinol	25	A	30	60, 80, 100	Uncovered	Controlled-release delivery system	Cook
		20	A	22	80, 100, 125, 150	Partially covered
		18, 20	A	23, 25	80, 100, 120	Fully covered
Wallstent™ Endoprosthesis	Stainless steel	20, 22	NA	NA	60, 90, 120	Uncovered	Reconstrainable	Boston Scientific
Wallstent™ Enteral	Elgiloy	20, 22	NA	NA	60, 90	Uncovered	Reconstrainable	Boston Scientific
Wallflex™ Colonic	Nitinol	22, 25	A	27, 30	60, 90, 120	Uncovered	Reconstrainable	Boston Scientific
Ultraflex™ colonic	Nitinol	25	A	30	57, 87, 117	Uncovered	Non-Reconstrainable	Boston Scientific
Hanarostent™ colorectal	Nitinol	22	A	28	60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170	Covered	Reconstrainable	MI tech
		24	A	30	60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170	Uncovered
Bonastent™	Nitinol	22, 24, 26	NA	NA	60, 80, 100, 120, 140, 160	Covered	Non-foreshortening	EndoChoice
						Uncovered
Niti-S™ D-Enteral colonic stent	Nitinol	18, 20, 22, 24	NA	NA	60, 80, 100, 120, 140, 150	Uncovered	Reconstrainable	Taewoong medical
Comvi™ Colonic stent	Nitinol	18, 20, 22	NA	NA	60, 80, 100, 120	Triple layered	Reconstrainable	Taewoong medical
Niti-S™ S-enteral colonic stent	Nitinol	18, 20	A	24	60, 80, 100, 120, 140, 150	Covered	Reconstrainable	Taewoong medical

A: Available; NA: Not available.