Coil Embolization for Cerebral Aneurysms Using a Semi-Jailing Technique and Open-Cell Stent

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Numerous reports have described the semi-jailing technique (SJT) using a closed-cell stent for stent-assisted coil embolization, revealing issues including poor expansion and thrombotic complications in curved vessels. This paper reports preliminary experience with SJT using an open-cell stent, a novel type of stent allowing stent placement from a microcatheter. First, this research investigated differences between open- and closed-cell types in SJT using silicone vessel models. Next, 43 patients who underwent SJT for the internal carotid artery were divided into 2 groups to investigate treatment outcomes: 24 patients with placement of an open-cell stent (open-cell group) and 19 patients with closed-cell stents (closed-cell group). In the silicone vessel model, coils could be placed with the open-cell stent deployed with a shorter length than the closed-cell stent. No significant differences were found between groups in terms of maximum diameter of the aneurysm or dome-neck ratio. The open-cell group showed a trend toward higher complete embolization immediately after surgery (54.2% vs. 26.3%, P= 0.06), with few cases of stent malapposition (0% vs. 31.6%, P < 0.01). However, 1 case of ischemic complication in the closed-cell group and 1 case of hemorrhagic complication in open-cell group occurred. All cases of modified Rankin Scale scores at discharge were 0-1. Although the open-cell stent carries the disadvantage of an unresheathable design, coil placement with a shorter stent deployment length may be advantageous during SJT for internal carotid artery aneurysm embolization with favorable consequences for excellent vessel wall apposition.