Mechanical thrombectomy using the Nimbus stent-retriever – initial experiences in a single-center observational study

• Published in: Interventional neuroradiology Vol. 30; no. 3; pp. 380 - 388
• Main Authors: Boriesosdick, Jan, Michael, Arwed Elias, Kröger, Jan-Robert, Niehoff, Julius Henning, Saeed, Saher, Pflug, Marc, Schellinger, Peter, Maus, Volker, Borggrefe, Jan, Mönninghoff, Christoph
• Format: Journal Article
• Language: English
• Published: London, England SAGE Publications 01.06.2024
• Subjects: Aged; Aged, 80 and over; Cerebral Angiography; Female; Humans; Infarction, Middle Cerebral Artery - diagnostic imaging; Infarction, Middle Cerebral Artery - surgery; Male; Middle Aged; New Devices and Technology; Stents; Thrombectomy - instrumentation; Thrombectomy - methods; Treatment Outcome; mechanical thrombectomy; stent-retriever; Nimbus; second-line device; stroke
• ISSN: 1591-0199; 2385-2011; 2385-2011
• DOI: 10.1177/15910199221129097

Background The Nimbus stent-retriever (NSR) was developed for mechanical thrombectomy of wall-adherent thrombi in cerebral arteries. It features a novel geometry with a proximal spiral section and a distal barrel section. The new device is designed to retrieve tough clots with a micro-clamping technique. In the first case series reporting on the NSR, we share our initial experience about the first 12 treated cases. Methods In total, 12 patients (5 men, 7 women; mean age 78 years) with occlusion of the internal carotid artery or the middle cerebral artery (M1 or M2 segment) were treated with the NSR, 11 after unsuccessful recanalization attempts with conventional stent-retrievers or aspiration thrombectomy. Results Retrieving maneuvers with the NSR recovered a thrombus in 7 patients (58%), of which 6 resulted in vessel recanalization mTICI ≥ 2b. Successful recanalization improved the mTICI score by a median of 3 points. In 5 of 7 cases, this required only one thrombectomy maneuver. In 5 cases, no improvement of recanalization could be achieved with the NSR (1–3 attempts). No NSR-related complications occurred in this case series. Conclusions In our initial experience, the NSR appeared to be a safe and effective second-line stent-retriever after unsuccessful MT with conventional stent-retrievers or aspiration thrombectomy allowing for mTICI ≥ 2b rescue thrombectomy in ab 50% of cases. No NSR associated complications occurred in our case series.