| 摘要 |
A balloon tip catheter for tearing away one way valves in a vein so that the vein can be used as a bypass conduit without the valves dictating the venous flow direction. The catheter balloon has an arrowhead shape when inflated, with an annular groove formed in the arrowhead base adjacent to and extending around the catheter tube. When the balloon is pulled against the valve, the groove receives the valve flap and tears it away from the vein wall.
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