| abstract |
A coil-type vasoocclusion device ( 10 ) for establishing an embolus or vascular occlusion in a human or veterinary patient is adapted for introduction into the patient via a catheter ( 32 ). The device ( 10 ) first includes a coil ( 12 ) having proximal and distal coil ends ( 16,18 ) and a coil lumen ( 20 ). The device ( 10 ) also includes a core ( 22 ) disposed in at least part of the coil lumen ( 20 ), the core having proximal and distal core ends ( 24,26 ). Only one core end ( 24 or 26 ) is directly affixed to a respective end ( 16 or 18 ) of the coil ( 12 ); the other core end ( 26 or 24 ) is not directly connected to either end ( 16 or 18 ) of the coil ( 12 ). The core ( 22 ) is preferably nitinol in a superelastic state, being in other than its stress induced, martensitic condition. The device ( 10 ) can include a thrombogenic material ( 38 ) connected to or carried by the coil ( 12 ). The coil ( 12 ) is preferably adapted to achieve a suitable secondary shape ( 60 ) when deployed from the catheter ( 32 ). A medical device ( 40 ) combining the catheter ( 32 ), a pusher ( 34 ), a coupling ( 30 ) and the vasoocclusion device ( 10 ) is also disclosed. The vasoocclusion device ( 10 ) 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 ( 22 ), substantially or completely preventing migration of the device ( 10 ) after its deployment. |