Abstract: An over-the-wire balloon catheter for use in angioplasty includes a proximal single lumen shaft and a multilumen distal portion on which an inflatable balloon is mounted. The lumen of the shaft acts as a combined inflation lumen and guide wire lumen. In the multilumen distal portion, a distal inflation lumen connects the combined lumen with the interior of the balloon, while the distal guide wire lumen extends through the balloon to provide a passage for a guide wire.

Abstract: A Y-adaptor manifold assembly includes a main tubular segment adapted to be coupled to an intravascular catheter. A first, tubular side port is joined to the main tubular segment so as to be in fluid communication with a through passage of the main tubular member. The first side port forms an infusion port for radiopaque dye. A second, tubular side port is joined to the main tubular segment so as to be in fluid communication with a through passage of the main tubular member. The second side port and main tubular segment are adapted to receive dilatation catheters. To prevent backbleeding, the second side port and main tubular segment include passive hemostatic valve mechanisms. Each valve mechanism includes a valve member and a disk valve. The valve member has a normally closed, sealed state, an open state and an in-use sealed state. The valve member has an inherent tendency to move to its normally closed, sealed state or its in-use state (wherein the valve member conforms about the dilatation catheter).