| 摘要 |
A novel fixation band for affixing a prosthetic heart valve in position within the heart. In one preferred form of the invention, the fixation band generally comprises a tubular frame having a distal end and a proximal end, and a tube having a distal end and a proximal end. The tubular frame comprises a plurality of longitudinally-extending members each having a hook on its distal end and fixation means on its proximal end. The tubular frame also comprises at least one laterally-extending member for stabilizing the longitudinally-extending members relative to one another so as to form the complete tubular frame. The tube is positioned inside the longitudinally-extending members, with the distal end of the tube being everted back over the aforementioned hooks. A sewing cuff is formed in the tube distal to the distalmost end of the longitudinally-extending members. In use, a standard prosthetic valve is secured to the distal end of the fixation band by suturing the prosthetic valve's sewing cuff to the fixation band's sewing cuff. Next, the prosthetic valve, with fixation band attached, is advanced to the valve's seat. Then the fixation band's tubular frame is pulled proximally slightly. This action causes the ends of the hooks to pass through the side wall of the everted tube and into the surrounding tissue at the valve's seat, whereby the fixation band, and hence the prosthetic valve, will be fixed against further proximal movement. Next, the fixation band's fixation means are deployed so as to secure the proximal end of the fixation band to the surrounding tissue, whereby the fixation band, and hence the prosthetic valve, will be fixed against distal movement.
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