| 摘要 |
<p>An improved embolic filter frame (31) has looped support struts (34). The frame provides enhanced longitudinal compliance, improved sealing against a vessel wall and a short deployed length. The struts (34) have a high degree of radial stiffness with a low degree of longitudinal stiffness. The loop support struts elongate when tensioned and assume a compressed and essentially linear form. While constrained in this linear state by a delivery catheter (92), the support struts exert minimal stress onto the delivery system. The overall delivery profile and stiffness are therefore reduced. When the delivery catheter constraint is removed during deployment, the struts 'snap open' and assume a looped configuration which exert a high degree of force onto the vessel wall, creating an enhanced filter to vessel wall seal. In addition, the looped struts (34) and the central collar (46) connecting the support struts to the support wire (36) are positioned essentially within the plane of the filter opening. The overall deployed length of the embolic filter (40) is reduced.</p> |
