Laser catheter having expanding distal end

A medical device, comprising:

• a catheter comprising:
• a retractable sheath disposed over a guidewire;
• an optical fiber bundle disposed between the retractable sheath and the guidewire, the optical fiber bundle comprising a plurality of optical fibers adapted to transmit laser light energy in a laser ablation procedure, wherein the optical fiber bundle comprises a first arm comprising a first plurality of optical fibers, and a second arm comprising a second plurality of optical fibers;
• and
• an expansion device disposed on the guidewire and adapted to expand the optical fiber bundle from a first diameter to a second diameter.