Mark H Wholey, Mark L Nagurka, Robert S Katz: Method and apparatus for dilating blood vessels. Richard V Westerhoff, Arnold B Silverman, February 9, 1988: US04723549 (787 worldwide citation)

A catheter for dilating occluded or stenotic blood vessels includes a collapsible filter device disposed between a dilating balloon and the distal end of the catheter. The collapsible filter device comprises a plurality of resilient ribs secured to the catheter at or adjacent the distal end thereof ...