The present invention relates to an apparatus for amelioration of urinary incontinence or pelvic organ prolapse in a female subject, the apparatus comprising: (a) a ring with adjustable stiffness, adapted for intra-vaginal insertion in a vagina； and (b) a stabilizing projection, extending transversely to a plane of said stiffenable ring along a longitudinal axis of the vagina, said stabilizing projection having a size, shape, stiffness and position configured to stabilize said stiffenable ring within the vagina, the apparatus including at least one through aperture for flow of a vaginal secretions therethrough and configured to be rotationally symmetrical around the longitudinal axis of the vagina.
