A fixation device, having an elongated element extending along a central axis, having a total length L and including a proximal section formed of a material that is substantially non-absorbent for electromagnetic radiation within a preselected wavelength range and a distal section formed of a material that is substantially nonabsorbent for electromagnetic radiation within the preselected wavelength range in combination with a middle section axially arranged between the proximal and distal sections, the middle section formed of a material that is substantially absorbent for electromagnetic radiation in the preselected wavelength range.一種固定裝置，包括細長的元件，該細長的元件沿中心軸線延伸，具有總長度L，且包括由基本不吸收預選波長範圍內的電磁輻射的材料形成的近端部分，和由基本不吸收該預選波長範圍內的電磁輻射的材料形成的遠端部分，以及軸向地佈置在該近端部分和遠端部分之間的中間部分，該中間部分由基本吸收該預選波長範圍的電磁輻射的材料形成。
