If the sensor has any of the anchors, hooks, harpoons, coils, barbs or other shapes and configurations of metallicelements described above, the catheter may be pressed to secure the pressure sensor to the aneurysm sac wall, as shown in FIG. 11, wherein a sensor 82 is positioned within aneurysm sac 84 adjacent aortic stent 86.A better appreciation of certain aspects of the invention, especially of