Steerable "PTCA" dilatation catheter with a regulating expansion section

Claim 1

A dilatation catheter to be used in percutaneous transluminal coronary angioplasty having an adjustable expandable section which under pressure takes up a pre-set balloon dimension to dilate stenotic coronary arteries according to their sizes without risk of under or over dilatation, the catheter comprising: a flexible reinforced tubular body, said shaft, of inner and outer tubes made of elastomeric materials and reinforced by high Joung modulus material, steel, metals, or fibers of max. elongation at break less than 6% which lies tightly packed lor a major length and contiguous thereto at the distal end a more open packed shorter length, said expandable section, the catheter can be internally pressurized in its total length with or without radial expansion at the expansion section, said balloon, the radial expansion section of the shaft distal end is controlled by the thumbwheel placed in the connector house, together with a polymer coated steel coil forming the catheter internal lumen being able to take up compression and extension forces in y-x axis without substantial physical deformation, the adjustable radial expandable section of the shaft allows to be compressed in the longitudinal axis, thus achieving the pre-set ballon diameter which under pressure takes up a well defined expanded diameter,increasing or decreasing balloon diameter, can be achieved at equal internal pressure.