The present document describes a pressure guidewire comprising: a shaft tube with a proximal section； a middle section extending from the proximal section of the shaft tube, the middle section having greater flexibility than the proximal section； an inner hypotube installed substantially within the middle section for optimal mechanical properties； a pressure sensor with a communication means routed through the middle section and the proximal section； and a sensor housing for receiving the pressure sensor. There are also described methods for joining the inner hypotube to the shaft tube.
