Intravascular devices, systems, and methods are disclosed. In some embodiments, a guidewire system for treating a patient includes an internal sensor mount having a body and a first cutout extending through a wall of the body； a core wire secured to the internal sensor mount； a sensor assembly for detecting a physiological characteristic of a patient secured to the internal sensor mount； an external housing disposed about the internal sensor mount and including an opening in communication with the cutout of the internal sensor mount； a proximal flexible member secured to at least one of the internal sensor mount and the external housing； a first distal flexible member secured to at least one of the internal sensor mount and the external housing； and at least one conductor electrically coupled to the sensor assembly and extending proximally beyond the internal sensor mount through the proximal flexible member.
