| 摘要 |
Apparatuses and methods for reshaping a mitral valve annulus to correct for mitral regurgitation. The apparatuses include one or more balloons in a balloon assembly that are delivered in a deflated state and inflated within the left coronary sinus adjacent mitral annulus. The balloon or balloon assembly may be linear and have one or both ends more flexible than a mid-section, or may be curvilinear. A single balloon having differently constructed end sections may be used. Alternatively, a balloon assembly may include two concentrically arranged balloons with an inner, shorter balloon and an outer, longer balloon. The outer balloon defines the ends of the balloon assembly and is inflated to a lesser pressure than the inner balloon so as to result in the flexible ends. Two or more balloons in series may be mounted on a catheter with gaps therebetween to permit relative flexing or bending. The inflation fluid may be saline or other biocompatible inflation fluid, or may be a fluid that can be subsequently hardened by curing or cross-linking. In either case, a one-way valve is typically utilized to prevent deflation of the balloon once implanted, and structure for decoupling the delivery catheter from the balloon or balloon assembly may be included.
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