Patent ID: 7927348

Claim:
An embolic coil comprising: a plurality of substantially coaxial components including a radially external component, a radially internal component and radially intermediate components; a wound coil including a plurality of turns defining a lumen having a proximal end and a distal end, the wound coil being the radially external coaxial component; a free-floating stretch resistant member that is fixedly unattached to the wound coil while being at least partially received within the wound coil lumen, the free-floating stretch resistant member having a proximal end, a distal end, a proximal enlarged portion, and a distal enlarged portion, the stretch resistant member being the radially internal coaxial component, the lumen of the wound coil is larger than the proximal enlarged portion and than the distal enlarged portion whereby these proximal and distal enlarged portions are movable through the coil lumen and one or both of the proximal and distal ends of the wound coil extend beyond the respective enlarged portion of the stretch-resistant member; proximal and distal restrictor members at least partially received within and fixedly attached to the lumen of the wound coil, the restrictor members being the radially intermediate coaxial components, wherein the proximal restrictor member defines an aperture smaller than the proximal enlarged portion of the stretch resistant member; and the distal restrictor member defines an aperture smaller than the distal enlarged portion of the stretch resistant member, the restrictor member apertures being substantially coaxial with the radially external, internal and intermediate components, a portion of the stretch resistant member is movable through the apertures to allow stretching of the wound coil during relative axial movement between the stretch resistant member and the restrictor member, the proximal enlarged portion of the stretch resistant member is adapted to engage the proximal restrictor member to resist stretching of the wound coil, and the distal enlarged portion of the stretch resistant member is adapted to engage the distal restrictor member to resist stretching of the wound coil.