Puncture of stents implanted into veins and arteriovenous fistulas: an experimental study

Cardiovascular and Interventional Radiology
K SchürmannR W Günther

Abstract

Puncture of venous Wallstents and nitinol stents with dialysis needles was tested in an animal study. In 15 sheep, divided into a group with prior surgical unilateral carotid-jugular shunt creation (9 sheep) and a second group without shunt creation (6 sheep), a self-expanding nitinol stent and/or a Wallstent were bilaterally placed into the jugular veins. After 1 month, 10 nitinol stents and 9 Wallstents were punctured weekly with a 15-gauge cannula over a period of 15 weeks. Stent patency was followed up by color-coded duplex ultrasound and angiography. After sacrifice, high resolution X-rays of the removed vessels were taken to assess stent deformation. From histological slices, neointimal thickness inside the stents was measured and analyzed statistically. Puncturing of both the nitinol stent and the Wallstent was technically feasible. Stent deformations were not found. One stent stenosis, probably related to puncture, was observed. The pattern of intimal hyperplasia differed between the nitinol stent and the Wall-stent. Outward bulge of the vascular layers over the stent struts was greater in nitinol stents. In the relevant area in between the stent struts there was no significant difference in intimal thickness between th...Continue Reading

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Citations

Sep 10, 2003·Journal of Vascular Nursing : Official Publication of the Society for Peripheral Vascular Nursing·Kathleen A Gross
May 25, 2001·AJR. American Journal of Roentgenology·G X ZaleskiJ Leef
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Jul 5, 2011·The Journal of Vascular Access·Gregory J Jaffers, Carlos G Fasola
Mar 30, 2021·Clinical Kidney Journal·José García-MedinaAlberto M Torres-Cantero

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