An apparatus for treating urinary incontinence, comprising: (a) a support section (60,80) adapted for providing urethral support; (b) an anchoring section (20) adapted for resisting movement of the apparatus; (c) a normally open expansion mechanism (102) adapted to urge the support radially outwards; and (d) a conversion mechanism (120) adapted to sharply and selectively reduce an outward urging of said support.
