One controlled fluid flow switch structure is described. A relatively rigid tubular shell 1 of the structure within it with a tubular elastic cylindrical member 2, wherein the end of cylindrical member 2 is attached to the interior wall of the shell 1 of tubulose. Space between housing wall and the cylindrical member of elasticity can increase, such as enter it under stress by pump fluid 8, and the expansion of cylindrical member 2 of elasticity is made therefore to reduce the flow cross section of valve. Mechanical Method can be used for influencing such expansion, such as rope or conducting wire, with means, provide the tension in rope so that elastic element 2 is upcountry expanded. Valve structure is particularly useful to control flow as first valve by an arteriovenous fistula for using surgery to manufacture and can also be used as an artificial sphincter to using.
