Perfusion catheter with moving tube

An intravascular balloon catheter which comprises a catheter body having a proximal end and a distal end, and a balloon carried adjacent said distal end, said catheter body defining an inflation lumen which extends along a length of said body proximal to said balloon and which communicates with the interior of said balloon, said catheter body also defining a guidewire lumen extending parallel along said catheter with said inflation lumen, a portion of said catheter body which defines said guidewire lumen terminating to define a space adjacent to and proximal of said balloon and an open, distal end;

• a first tube, aligned with and longitudinally spaced from said guidewire lumen, said first tube extending along said balloon and open at both ends;
• a sliding tube, positionable within said guidewire lumen and long enough to extend from the catheter proximal end at least to said first tube, whereby said sliding tube may occupy an advanced position of engagement with said first tube, with the sliding tube passing across said space to facilitate guidewire advancement through the catheter, and said sliding tube can occupy a retracted position in which said sliding tube is proximal to said space to allow blood to flow through said space and distally along said balloon through said first tube.

An intravascular balloon catheter, which comprises:

• a catheter body having a proximal end and a distal end, and having a balloon carried adjacent said distal end;
• said catheter body defining an inflation lumen which extends along a length of said body proximal to said balloon, and which communicates with the interior of said balloon, said catheter body also defining a guidewire lumen;
• a first tube, aligned with and longitudinally spaced from said guidewire lumen, said first tube extending along the balloon and open at both ends, said catheter body comprising an outer portion which defines said inflation lumen and said guidewire lumen spaced from and parallel to said inflation lumen, and a sliding tube positionable in slidable relation within said guidewire lumen, said sliding tube defining a second lumen and being slidable between an advanced position in which the second lumen and first tube are together to allow advancement of a guidewire through both the second lumen and first tube, and a retracted position in which the sliding tube and second lumen are spaced from said first tube, whereby said first tube is open to receive blood flow therethrough, said sliding tube being long enough to extend fully through said first tube to provide a narrowed catheter distal tip in the advanced position, said inflation lumen being non-circular in cross section.