A device for repositioning an implantable device within a natural bodily lumen includes an inner tube defining an internal lumen and adapted for insertion into a natural bodily lumen. An elongated member is slidably or rotatably disposed within the lumen of the inner tube, with a grasper disposed at the distal end of the elongated member adapted to grasp a portion of the implantable device. The implantable device, once grasped, can be at least partially collapsed. For example, a hook-shaped grasper grasps a drawstring of the implantable device, manipulating the drawstring and causing the implant to radially collapse. A retrieval hood is advanced over the collapsed portion of the implantable device. While maintaining its grasp, the repositioning device and the implantable device can then be repositioned or removed as one unit from the body by pulling the repositioning device from its proximal end.