A surgical instrument includes a heat generating component, a heat sink, and elongate shaft, an elongate thermal conduit, and a movable contact structure. The elongate shaft extends from the heat generating component to the heat sink. The elongate thermal conduit is coupled to the heat generating component and extends within the elongate shaft between the heat generating component and the heat sink. The movable contact structure is positioned within the heat sink and is thermally coupled between the elongate thermal conduit and the heat sink. The elongate thermal conduit extends into the movable contact structure and the movable contact structure is movable relative to the heat sink.