Angioplasty dilating guide wire

Details Angioplasty dilating guide wire Angioplasty dilating guide wire

A - Human Necessities

61

M

128/126

A61M 29/00 (2006.01) A61M 29/02 (2006.01) G01M 3/26 (2006.01)

Patent

CA 1284075

ABSTRACT OF THE DISCLOSURE A dilating guide wire for use in percutaneous transluminal angioplasty has a very small outside diameter which permits it to be used advantageously with a percutaneous transluminal coro- nary angioplasty (PTCA) catheter for treatment of very tight stenoses in the coronary arteries that cannot be treated by con- ventional PTCA catheters alone. The dilating guide wire is small enough to pass through the through lumen of the PTCA catheter and extend beyond the distal tip thereof for predi- lating the stenosis to open it sufficiently for subsequent crossing and dilation by the PTCA catheter. According to a pre- ferred form of the invention, the dilating guide wire has a hollow core communicating to a small opening to the balloon area at the distal end, and venting to the atmosphere at the proximal end of the dilating guide wire, to serve as a vent for air displaced from the balloon as it is inflated with inflation fluid. The small dimensions of the vent path in the core result in self-sealing of the vent with respect to the inflation fluid, due to the surface tension and capillary action of the inflation fluid attempting to move into the vent as teh balloon is pressurized. According to another feature, a control handle is provided for selectively imparting an axial force to the balloon of the dilating guide wire to cause axial stretching thereof, thereby reducing its profile and facilitating withdrawal of the balloon area of the dilating guide wire back into the through lumen of the PTCA catheter. Methods of treating stenoses using the dilating guide wire and a PTCA catheter are also disclosed.

543980

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