Change of stent cells of different Carotid Wallstent placed in a uniform tube: Carotid Wallstent cell is stretched longitudinally when placed in a vessel of smaller diameter than the stent

Objective: Carotid Wallstent is available in three diameter sizes. It is considered important to have knowledge regarding the state of the stent cells of different sizes of Carotid Wallstent. The aim of this study was to examine the state of stent cells of different sizes. Methods: The 6mm, 8mm and 10mm diameter Carotid Wallstents were deployed in a 6mminner diameter tube. States of stent cells of Carotid Wallstents in tube were examined for shape, angle of one stent cell, area of one stent cell, and stent cell number per 1 cm2. Results: Cell shape was stretched longitudinally when placed in a tube of smaller diameter than the stent. Angle of stent cell of 6, 8, and 10 mm diameter Carotid Wallstent were mean 116.4, 82.8, and 67.2 degrees, respectively. Free cell area of 6, 8, and 10 mm diameter Carotid Wallstent were mean 2.7, 3.2, and 4.4mm2, respectively. Stent cell number per 1 cm2 of 6, 8, and 10 mm diameter Carotid Wallstent were mean 37.1, 31.1, and 22.7 cells, respectively. Conclusions: It may be necessary to select a stent of diameter near the target vesseldiameter to expect a high stent mesh density by stent cells.