Vasoocclusion coil device having a core therein

Abstract

A coil-type vasoocclusion device ( ) for establishing an embolus or vascular occlusion in a human or veterinary patient is adapted for introduction into the patient via a catheter ( ). The device ( ) first includes a coil ( ) having proximal and distal coil ends ( ) and a coil lumen ( ). The device ( ) also includes a core ( ) disposed in at least part of the coil lumen ( ), the core having proximal and distal core ends ( ). Only one core end ( or ) is directly affixed to a respective end ( or ) of the coil ( ); the other core end ( or ) is not directly connected to either end ( or ) of the coil ( ). The core ( ) is preferably nitinol in a superelastic state, being in other than its stress induced, martensitic condition. The device ( ) can include a thrombogenic material ( ) connected to or carried by the coil ( ). The coil ( ) is preferably adapted to achieve a suitable secondary shape ( ) when deployed from the catheter ( ). A medical device ( ) combining the catheter ( ), a pusher ( ), a coupling ( ) and the vasoocclusion device ( ) is also disclosed. The vasoocclusion device ( ) is easily repositioned in the vascular system, thereby ensuring proper deployment, and also enjoys a dislodging force about twice as great as comparable coil-type devices lacking the core ( ), substantially or completely preventing migration of the device ( ) after its deployment.