| 摘要 |
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.
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