A balloon dilatation catheter used for percutaneous transluminal coronary angioplasty includes an inner tube and an outer tube. The anchor joint of the inner tube and outer tube is permit distal movement of the inner tube with respect to the outer tube while precluding proximal movement of the inner...http://www.google.co.uk/patents/US6066157?utm_source=gb-gplus-sharePatent US6066157 - Anchor joint for coaxial balloon dilatation catheter
