| 摘要 |
A vasoocclusive device (10) is adapted for introduction into a vessel of a human or veterinary patient and occluding flow through the vessel. The device (10) includes a radiopaque member (12) (such as a metallic coil (14)) having a proximal end (16) and a distal end (18), the distal end (18) being introduced first into the vessel. The member (12) is about 1.5 mm to about 3.0 mm long and no more than about 2.7 mm wide, preferably about 0.25 to 0.4 mm wide. The device (10) also includes a distal plurality (20) of fibers having an average distal fiber length, associated with and extending away from the distal end (18) of the member (12), as well as a proximal plurality (24) of fibers having an average proximal fiber length, associated with and extending away from the proximal end (16) of the member (12). The average proximal fiber length is about two to about five times the average distal fiber length. The average distal fiber length is preferably about 4 to 8 mm, while the average proximal fiber length is preferably about 9 to 15 mm. The distal and proximal pluralities (20, 24) of fibers each preferably include 8 to 10 individual fibers composed of polyester, nylon or silk of about 40 denier. The vasoocclusive device (10) is particularly advantageous in that it can be used in vessels which are significantly narrower than those in which prior devices could be used, yet its asymmetric arrangement of the distal and proximal pluralities (20, 24) of fibers allows it to enjoy significantly improved lodging in such narrow vessels. |
