Abstract: An apparatus and method for reversibly modifying the shape of a selected portion of the body such as the pharynx, to produce a desired result, for example, to overcome obstructive sleep apnea by urging open the pharynx. The apparatus includes a preconfigured structure having a shape-memory with an activated shape and a quiescent shape. The preconfigured structure is shaped to conform to the selected portion of the body. The shape-memory is responsive to activation energy and urges the preconfigured structure from the quiescent shape to the activated shape. Furthermore, the activated shape of the preconfigured structure exerts a force on the selected portion, thereby modifying the shape of the selected portion. The preconfigured structure can be attached to an exterior surface of, or can be implanted within the body proximate to, the selected portion of the body.