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Purpose: Durability of embolization of cerebral aneurysms has been hypothesized to result from greater packing density during the initial treatment. Coil development has been directed toward this goal through modifications in the coil properties. Deltapaq (Micrus, San Jose, California, USA) filling coils have been manufactured with a unique primary wind to allow increased coil breaking during deployment and softness to allow greater packing of aneurysms.

Methods: Case logs were reviewed for embolizations with the Deltapaq coil. We report the initial multicenter procedural experience with these coils.

Results: 49 patients with 51 aneurysms were identified. Mean age was 56 years, and aneurysms were treated electively in 33 (65%). The mean largest diameter of the aneurysm was 6.8±3.2 mm. Packing density (PD) achieved in these aneurysms was 40.8±19.6%. Balloon assist was used for 25 aneurysms and …