FRED™ Jr: Small-Vessel Flow Diverter for Distal ICA and MCA Aneurysms
Автор: Modern Medical Solutions Editorial Team
The FRED™ Jr from MicroVention Terumo extends flow diversion therapy to parent arteries as small as 2.0 mm, delivered via Headway 17 microcatheter, enabling treatment of distal ICA, MCA M1, and other small-vessel aneurysms that are anatomically too distal or narrow for the standard FRED or FRED X System 27.
What Is the FRED™ Jr?
The FRED™ Jr (Flow Re-Direction Endoluminal Device Junior) is a small-vessel flow diverter from MicroVention Terumo designed for intracranial aneurysms arising from parent arteries between 2.0 and 3.0 mm in diameter. It retains the dual-layer design of the standard FRED — an outer low-density nitinol scaffold combined with an inner high-density mesh — but downsized for delivery through a Headway 17 microcatheter (0.017 in ID), opening flow diversion therapy to vessel calibres that neither the standard FRED nor FRED X System 27 can reach.
Flow diversion in small vessels carries a higher risk of in-stent thrombosis than in large vessels, so DAPT loading, platelet function testing, and meticulous antiplatelet management are even more critical for FRED Jr cases than for standard FRED. Operators should confirm adequate P2Y12 inhibition via VerifyNow before proceeding.
Technical Specifications
FRED Jr is available in deployed diameters of 2.5 mm and 3.0 mm with lengths from 13 mm to 25 mm, covering the neck length range encountered in small-vessel aneurysms. The dual-layer construct provides approximately 30–35% mesh density across the aneurysm neck zone. The inner high-mesh layer self-expands and engages immediately upon deployment; the device can be resheathed and repositioned within the permitted window before final release.
The Headway 17 delivery profile of FRED Jr is substantially lower than the Headway 27 required for standard FRED, enabling access to more distal anatomy where a Headway 27 may not track reliably.
Clinical Applications
FRED Jr is indicated for unruptured saccular aneurysms arising from parent arteries of 2.0–3.0 mm where surgical clipping is high-risk and conventional endovascular options are technically limited. Specific anatomical targets include distal ICA aneurysms at or just proximal to the bifurcation, MCA M1 segment aneurysms, and proximal A1 aneurysms with sufficient landing zone.
FRED Jr is generally not used in the acute ruptured setting due to the DAPT requirement. Operators must confirm sufficient proximal and distal landing zones (minimum 5 mm each) before committing to FRED Jr — inadequate landing zones are the primary technical failure mode in small-vessel flow diversion.
Technique Tips
Size FRED Jr 0.25–0.5 mm above the reference vessel diameter to ensure adequate radial force and wall apposition. 3D-DSA measurement is mandatory. Route Headway 17 distal to the aneurysm neck over a CHIKAI 14 wire, then deploy FRED Jr by slowly retracting the delivery catheter while holding the pusher wire. Confirm inner mesh engagement fluoroscopically using the device’s dual markers.
Post-procedure imaging at 3–6 months is standard to assess occlusion progress — delayed occlusion at 12 months is not uncommon in flow diversion and should not be interpreted as treatment failure at earlier time points.
Ordering Through Modern Medical Solutions
Modern Medical Solutions is the authorised MicroVention Terumo distributor for Tajikistan and Afghanistan. FRED Jr is available across its full diameter and length range for neurointerventional programmes in Tajikistan and Afghanistan.
Contact Modern Medical Solutions to discuss FRED Jr alongside FRED X System 21, Headway 17, and the CHIKAI wire family for a complete small-vessel flow diversion system.
