Stent

Material

Covering

Antireflux Valve

FDA Approved

・ Esophageal Z

Stainless Steel

Fully/partially covered

Yes (dua variant)

Yes

・ Evolution

Nitinol

Partially covered

No

Yes

・ Flamingo Wall stent

Stainless steel

Partially covered

No

No

・ Gianturco Z

Stainless Steel

Partially covered

Yes

No; shaft bars

No

No

・ Niti-S

Nitinol

Fully/partially covered

Yes (PTFE variant)

Yes

・ Polyflex

Polyester

Fully covered

No

Yes

・ Ultraflex NG

Nitinol

Not covered/partially covered

No

Yes

・ Wallflex

Nitinol

Fully/partially covered

No

Yes