Expandable laser catheter

Abstract

Expandable laser catheters for utilizing laser energy to remove obstructions from body passages are described. In one embodiment, the laser catheter includes a shaftway having a distal end including a flexible portion configured in a series of radial folds. Multiple optical fibers, configured to transmit laser energy, extend along the shaftway and are attached to the flexible portion. An inflatable, ring-shaped balloon is attached to the catheter within the flexible portion. In use, the catheter is inserted into a body passage such as an artery, and advanced until the distal end is adjacent to an obstruction. The balloon is inflated to expand the flexible portion and to bring the optical fibers nearer the inner wall of the body passage. Laser energy is directed by the optical fibers toward targeted regions of the obstruction. As the catheter is advanced and the process repeated, a core is formed from the obstruction and contained within the flexible portion. The flexible portion is then contracted to hold the core, and the core is removed from the body passage by withdrawing the catheter.

What is claimed is: 
     
         1 . A laser catheter for removing a core of an obstruction from a body passage, said catheter comprising:
 a shaftway having a proximal end and a distal end;   a flexible portion adjacent said shaftway distal end, said flexible portion configured in a plurality of folds and having a distal end;   a plurality of optical fibers extending between said shaftway proximal end and said flexible portion distal end, said optical fibers having distal ends attached to said flexible portion; and   means for expanding said flexible portion, said means configured to expand the folds of said flexible portion so that a core retention region is created.   
     
     
         2 . The laser catheter in accordance with  claim 1  wherein said means for expanding said flexible portion is attached to said flexible portion. 
     
     
         3 . The laser catheter in accordance with  claim 1  wherein said means for expanding said flexible portion comprises an inflatable balloon. 
     
     
         4 . The laser catheter in accordance with  claim 3  wherein said balloon comprises a ring-shaped balloon. 
     
     
         5 . The laser catheter in accordance with  claim 4  wherein said ring-shaped balloon is attached to said flexible portion. 
     
     
         6 . The laser catheter in accordance with  claim 1  further comprising a guidewire, wherein said shaftway is configured to slidably extend over said guidewire. 
     
     
         7 . The laser catheter in accordance with  claim 1  further comprising an outer catheter body, and wherein said shaftway is configured to be slidably inserted through said outer catheter body. 
     
     
         8 - 35 . (canceled)