Abstract: An implantable magnetically activated actuator suitable for causing distraction, compression/contraction and/or oscillation of body organs and/or bones, comprising: a hollow housing comprising rear and front ends; a rod movably disposed in the rear portion of said hollow housing; magnetic coupling means comprising static magnetic/ferromagnetic elements affixed along the inner wall of said hollow housing and movable magnetic/ferromagnetic elements affixed along said movable rod in proximity to said stationary magnetic/ferromagnetic elements; mechanical means for transferring reciprocating motion of said movable rod.