The invention relies on a medical device for an intracorporeal location, comprising a deformable armature, at least partially made of a shape memory material and having an Ea end and an Eb end, said Ea end being larger than said Eb end.The invention also relies on a device for the introduction, by an endoscopic or percutaneous way, of the medical device, and on a method for accurately targeting a target area during radiation treatment through image guidance comprising determining the location of the medical device in real time using at least one method of targeting selected from the group consisting of lasers, visual, infrared, MRI/MRS, RF and radiation and modifying the radiation treatment beam path to adaptively compensate for a change in position of the target area.
