Abstract: A device for sensing the profile of a hollow body organ includes a hollow guidewire or probe carrying a sensor. The hollow probe includes a distal coiled end tube with a tip bent at an angle between about 10° to 90° relative to the probe longitudinal axis and having a torque response of no more than about 0.4 ozf in. The flexural rigidity of the distal end tube relative to the mid and proximal end tubes forming the probe is generally in the range of about 1:(4 to 4,400):(110 to 13,000), respectively. An actuator is detachably secured to the probe and includes one or several motors which allow the sensor to travel in a rotational and axial path through the body organ.