A Multicenter retrospective study of the COSIS technique in the treatment of chronic internal carotid artery occlusion
Objective Our study aims to introduce a novel interventional treatment strategy for the management of chronic occlusion of the internal carotid artery (CO-ICA) using a specially designed thrombectomy stent, named the Chronic artery OccluSion recanalization with Intracranial protection using Stent retriever (COSIS) technique. Methods Thirty-two patients from four centers with CO-ICA between March 2023 to September 2024 were analyzed, retrospectively. All patients were classified into four types based on the occlusion segment. Patient demographics, endovascular thrombectomy (EVT) details, recanalization rates, intraoperative complications, and follow-up outcomes were evaluated. Results All 32 patients achieved successful recanalization. Dissection occurred in four patients (12.50%). No reocclusion, perforation, or other severe intraoperative complications occurred. Thrombus was extracted in 21 patients (65.62%). The median modified Rankin Scale (mRS) score at the 3 month follow-up was 1.
