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Table 1: Neurovascular thrombectomy devices
Description Solitaire FR 4 mm Solitaire FR 6 mm Catch Merci Retriever V 2.5 Firm Penumbra 0.32
Recommended guide catheter (F) 6 6 6 9 6
Microcatheter (F) 2.4 2.8 2.4 2.4 3.4
Element design Stent retriever Stent retriever Basket-like 5 Helical loops Aspiration
Outer diameter (mm) 4 6 4 2.5 Not described
Length (mm) 20 20 18 6 30
Recommended vessel diameter (mm) 2.0–4.0 3.0–5.5 ≤4 2.0–3.5 2.0–3.0
Note:—F indicates French.

Description	Solitaire FR 4 mm	Solitaire FR 6 mm	Catch	Merci Retriever V 2.5 Firm	Penumbra 0.32
Recommended guide catheter (F)	6	6	6	9	6
Microcatheter (F)	2.4	2.8	2.4	2.4	3.4
Element design	Stent retriever	Stent retriever	Basket-like	5 Helical loops	Aspiration
Outer diameter (mm)	4	6	4	2.5	Not described
Length (mm)	20	20	18	6	30
Recommended vessel diameter (mm)	2.0–4.0	3.0–5.5	≤4	2.0–3.5	2.0–3.0