A stent is a miniature mesh tube, made of a biocompatible metal, biodegradable metal or polymer, placed inside of a blood vessel (Cardiovascular, neurovascular and peripheral blood vessels) or a natural conduit (Gastrointestinal, urinary and biliary tracts). The stent acts as a scaffold, pushing against the internal walls of the conduit / vessel to open a blocked area and thereby enables natural flow and prevents the vessel from collapsing, narrowing or closing.

Stents differ greatly in their design, dimensions and the optimal material for their fabrication, based on their intended application. The following table enumerates common stent applications and the range of possible dimensions:

Stent Common materials Diameter (mm) Length (mm) Thickness (mm)
Coronary Stainless, CoCr 2.0-4.5 6-32 0.08-0.11
Neurovascular Nitinol 2.0-5.0 6-50 0.10-0.15
Carotid Nitinol 6.0-10.0 15-60 0.10-0.20
Peripheral Stainless, Nitinol 9.0-14.0 20-80 0.15-0.20
Biliary Nitinol 6.0-14.0 20-150 0.20-0.30