Twisted primary wind coil for vascular treatment, method for forming the same, and secondary wind coil

摘要

A flexible metal wire coil is formed with a twisted coil pattern, by forming a primary coil on a special mandrel formed from two or more strands of material twisted helically about a longitudinal axis to have a helical shape. The primary coil wire is wound around the mandrel to give the primary coil a twisted shape corresponding to the helical shape of the mandrel.