Improved Flexible Mechanical Delivery and Detachment System for Embolization Coils: Design, Modeling, and Experimental Evaluation.

Dense and safe packing of intracranial aneurysms with embolization microcoils is critically important to prevent recurrence. While the properties of the coils themselves are widely studied, the mechanical characteristics of the delivery and detachment systems also significantly affect implantation quality. This study presents a novel system combining a dual-core stainless steel microcable and an outer delivery spiral with a flexible looped hinge detachment. The design improves flexibility and catheter control in tortuous anatomy. Bench testing demonstrated reduced bending stiffness, greater angular mobility, and immediate clean detachment without residual components. The prototypes withstood loads far exceeding clinically acceptable limits. The proposed system may improve endovascular embolization outcomes and serve as a foundation for further development.