| 摘要 |
A check valve has a mesh frame structure, an expandable seal ring, and a plurality of sleeve strips positioned in and attached to the interior of the frame structure. The check valve can be introduced along a tool shaft, between the tool shaft and a sheath, for positioning in a chamber or vasculature. Removal of the sheath allows a shape memory alloy mesh forming the frame structure to expand and press the seal structure against an adjacent wall. Cardiac function is augmented during valve replacement procedures, such as valve excision, valve implantation, or valve leaflet replacement, by placing the temporary check valve just upstream of the valve being treated. The check valve is collapsible to be inserted through a small incision in the apex of the heart or through the aorta into the ventricular cavity and re-collapsed by retraction within the sheath for removal after the procedure. |
