Three element coaxial vaso-occlusive device

Details Three element coaxial vaso-occlusive device Three element coaxial vaso-occlusive device

A - Human Necessities

61

L

A61L 31/04 (2006.01) A61B 17/00 (2006.01) A61B 17/12 (2006.01) A61L 31/16 (2006.01)

Patent

CA 2717255

A vaso-occlusive device (10) includes inner (11), intermediate (12), and outer (13) elements arranged coaxially. The inner element is a filamentous element, preferably a microcoil. The intermediate element is made of a non-metallic material, preferably an expansile polymer. The outer element is substantially non-expansile and defines at least one gap or opening through which the intermediate element is exposed. In a preferred embodiment, when the intermediate element is expanded, it proturdes through the at least one gap or opening in the outer element and assumes a configuration with an undulating, convexly-curved outer surface defining a chain of arcuate segments, each having a diameter significantly greater than the diameter of the outer element. The expanded configuration of the intermediate element minimizes friction when the device is depolyed through a microcatherter, thereby reducing the likelihood of buckling while maintaining excellent flexibility. The result is a device with enhanced pushability and trackability when deployed through a microcatheter.

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