Early postmarket results with embotrap II stent retriever for mechanical thrombectomy: a multicenter experience

A. Srivatsan, V. M. Srinivasan, R. M. Starke, E. C. Peterson, D. R. Yavagal, A. E. Hassan, A. Alawieh, A. M. Spiotta, Y. Saleem, K. M. Fargen, S. Q. Wolfe, R. A. de Leacy, I. P. Singh, I. L. Maier, J. N. Johnson, J. K. Burkhardt, S. R. Chen, P. Kan

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


BACKGROUND AND PURPOSE: EmboTrap II is a novel stent retriever with a dual-layer design and distal mesh designed for acute ischemic stroke emergent large-vessel occlusions. We present the first postmarket prospective multicenter experience with the EmboTrap II stent retriever. MATERIALS AND METHODS: A prospective registry of patients treated with EmboTrap II at 7 centers following FDA approval was maintained with baseline patient characteristics, treatment details, and clinical/radiographic follow-up. RESULTS: Seventy patients were treated with EmboTrap II (mean age, 69.9 years; 48.6% women). Intravenous thrombolysis was given in 34.3%, and emergent large-vessel occlusions were located in the ICA (n ¼ 18), M1 (n ¼ 38), M2 or M3 (n ¼ 13), and basilar artery (n ¼ 1). The 5 33 mm device was used in 88% of cases. TICI $ 2b recanalization was achieved in 95.7% (82.3% in EmboTrap II–only cases), and first-pass efficacy was achieved in 35.7%. The NIHSS score improved from a preoperative average of 16.3 to 12.1 postprocedure and to 10.5 at discharge. An average of 2.5 [SD, 1.8] passes was recorded per treatment, including non-EmboTrap attempts. Definitive treatment was performed with an alternative device (aspiration or stent retriever) in 9 cases (12.9%). Some hemorrhagic conversion was noted in 22.9% of cases, of which 4.3% were symptomatic. There were no device-related complications. CONCLUSIONS: Initial postmarket results with the EmboTrap II stent retriever are favorable and comparable with those of other commercially available stent retrievers. Compared with EmboTrap II, the first-generation EmboTrap may have a higher first-pass efficacy; however, data are limited by retrospective case analysis, incomplete clinical follow-up, and small sample size, necessitating future trials.

Original languageEnglish (US)
Pages (from-to)904-909
Number of pages6
JournalAmerican Journal of Neuroradiology
Issue number5
StatePublished - May 1 2021
Externally publishedYes

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Clinical Neurology


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