Fig. 2From: Design of percutaneous transluminal coronary angioplasty balloon cathetersa Microscopic images show the folded balloon with the distal radio-opaque marker (upper row), the tip design (mid row), and the damaged tip after testing (bottom row) of the catheters. b Median forces and Inter Quartile Range (IQR) required to compress the tip by 0.5 mm, and the diameter increase of the tips after testingBack to article page