An apparatus for measuring the micromotion of the wall of a hollow organ comprises: a catheter having a first end and a second end; an inflatable balloon disposed over the first end of the catheter with the balloon being fluid tightly sealed to the catheter at a position intermediate the first and second...http://www.google.com/patents/US5617876?utm_source=gb-gplus-sharePatent US5617876 - Apparatus for examining the functioning of body structures comprising smooth muscle walls
