In medicine, a<unk>  is a metal or plastic tube inserted into the lumen of an anatomic vessel or duct to keep the passageway open, and<unk> ing is the placement of a<unk> . There are a wide variety of<unk> s used for different purposes, from expandable coronary, vascular and biliary<unk> s, to simple plastic<unk> s used to allow the flow of urine between kidney and bladder.<unk> " is also used as a verb to describe the placement of such a device, particularly when a disease such as atherosclerosis has pathologically narrowed a structure such as an artery. A<unk>  is different from a shunt. A shunt is a tube that connects two previously unconnected parts of the body to allow fluid to flow between them.<unk> s and shunts can be made of similar materials but perform two different tasks.
Stent
Ligature 
Prosthesis
Surgical staple
Liftware
Surgical tape
Graft 
Splinter