Flow diverter devices are small stents used to divert blood flow away from aneurysms in the brain,stagnating flow and inducing intra-aneurysmal thrombosis which in time will prevent aneurysm *** devices are formed fro...
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Flow diverter devices are small stents used to divert blood flow away from aneurysms in the brain,stagnating flow and inducing intra-aneurysmal thrombosis which in time will prevent aneurysm *** devices are formed from thin(~25μm)wires which will remain in place long after the aneurysm has been *** their continued presence could lead to secondary complications,an absorbable flow diverter which dissolves into the body after aneurysm occlusion is *** absorbable metals investigated to date struggle to achieve the necessary combination of strength,elasticity,corrosion rate,fragmentation resistance,radiopacity,and *** work proposes and investigates a new composite wire concept combining absorbable iron alloy(FeMnN)shells with one or more pure molybdenum(Mo)*** wire configurations are produced and drawn to 25–250μm *** testing revealed high and tunable mechanical properties on par with existing flow diverter *** vitro degradation testing of 100μm wire in DMEM to 7 days indicated progressive corrosion and cracking of the FeMnN shell but not of the Mo,confirming the cathodic protection of the Mo by the FeMnN and thus mitigation of premature fragmentation *** vivo implantation and subsequentμCT of the same wires in mouse aortas to 6 months showed meaningful corrosion had begun in the FeMnN shell but not yet in the Mo filament *** total,these results indicate that these composites may offer an ideal combination of properties for absorbable flow diverters.
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