Perfusion dilatation catheter with expanded support coil

Claim 1

A balloon dilatation catheter having perfusion capabilities, comprising: a) an elongated shaft having proximal and distal ends, proximal and distal shaft sections, a port in the distal end, a first inner lumen extending within at least the distal shaft section to the port in the distal end which is configured to slidably receive a guidewire therein and a second inner lumen extending through the proximal shaft section and the distal shaft section to a location in the distal shaft section spaced from the distal end; b) an inflatable balloon on the distal shaft section having an interior in fluid communication with the second inner lumen; c) an expanded helical coil supporting the first inner lumen within the distal shaft section, and d) a plurality of elongated perfusion ports in the distal catheter shaft section proximal to the inflatable balloon, at least one of said elongated perfusion ports exposing a plurality of turns of the expanded helical coil and being in fluid communication with the first inner lumen extending within the distal shaft section.