A pressure sensitive device including a body having a proximal portion and a distal portion opposite the proximal portion, the distal portion being made of a shape memory alloy, a flexible diaphragm at least partially surrounding the body and defining a fluid chamber between the flexible diaphragm and the distal portion of the body, and a non-compressible fluid disposed within the flexible diaphragm and exhibiting a hydraulic pressure in communication with the flexible diaphragm.