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Bench testing of a 34 mm covered Zephyr stent (a) on a 22 mm x 4 mm balloon (b) showing good integrity of the ePTFE cover and minimal foreshortening (c) from 34 mm to 31.5 mm (7.4%) and absence of recoil (d). ePTFE: Expanded polytetrafluoroethylene
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After a bench testing, a 48 mm long-covered Zephyr stent was mounted on a 16 mm x 40 mm Z-med balloon (NuMED Inc, Hopkinton, NY) [Figure 1].
Aortogram in lateral view (a) shows severe postsubclavian coarctation and poststenotic dilatation of descending aorta. After deployment of a 48 mm long covered Zephyr stent on a 16 mm balloon, (b) angiogram with a marker pigtail shows good expansion without foreshortening. (c) Magnified view (d) shows complete stent expansion
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There was no residual gradient across the stent, and the aortogram showed no evidence of dissection or perforation [Figure 2].
Multiplanar reformatted view shows the stent in the long axis view of the aortic arch (a) on computed tomography at 6-month follow-up. The cross-sectional views at the upper, (b) middle (c), and lower (d) levels and volume rendered image (e) show good opposition of covered stent to the aortic wall without any evidence of pseudoaneurysm. The stent length is 46.8 mm demonstrating negligible foreshortening
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There was no pseudoaneurysm or aortic dissection [Figure 3].