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Interventional Radiology
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Gastrointestinal
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Stents
Available since June 2011, the EGIS oesophageal stent is based on the EGIS enteral stents. As a "knitted" stent design the skeleton is made from interweaved nitinol wire. In contrast to braided stents this removes straightening forces and the stent displays amazing three-dimensional conformability. This allows alignment around the cardia without causing pressure on the oesophageal wall. It has a dog-bone shape and is available with and without anti-reflux valve.
Available since June 2011, the EGIS oesophageal stent is based on the EGIS enteral stents.
As a “knitted” stent design the skeleton is made from interweaved nitinol wire. In contrast to braided stents this removes straightening forces and the stent displays amazing three-dimensional conformability. This allows alignment around the cardia without causing pressure on the oesophageal wall. It has a dog-bone shape and is available with and without anti-reflux valve.
The stent is available in three different trunk sizes from 16 – 20mm. The heads of the standard 18mm trunk increase to 26mm in two steps, the heads of the stent are 25mm long, therefore a stent with a 4cm trunk is 9cm long. Due to the knitted design stent shortening on deployment is reduced to approx. 30% compared with 50% of a braided stent (depending on stent size).
Stents are covered in silicone with an additional PTFE sleeve over the trunk.
Two removal strings are applied:
1. An “aircraft carrier” type purse string around the proximal edge, which rolls slightly inwards to reduce trauma to the oesophagus
2. A conventional retrieval loop at the distal end.
Stents come preloaded in an 18Fr delivery system. The stents cannot be resheathed, but quite easily repositioned while part-deployed. Expansion force is gentle but sustained and increases over hours with warming to body temperature due to the shape-memory properties of nitinol.
Dr Hans-Ulrich Laasch MRCP FRCP, Consultant Radiologist, Christie Hospital NHS Foundation Trust, Manchester, UK - No Conflict Declared
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