An intravascular catheter device comprising: a handle assembly including a control member that is movably supported thereon; a flexible catheter tube ; a selectively expandable portion extending from a distal end of the catheter tube and having a plurality of struts (34A and 34B, 134A and 134B, 234A and 234B) each defining an outer surface, the expandable portion being operable between a closed position, wherein the expandable portion has a first diameter (D1), and an opened position, wherein the expandable portion has a second diameter (D2) that is larger than the first diameter (D1); an incising element provided on the outer surface of at least one of the struts (34A and 34B, 134A and 134B, 234A and 234B), the incising element having a blade that extends outwardly in a radial direction from the outer surface of the strut (34A and 34B, 134A and 134B, 234A and 234B) and extends parallel with a longitudinal axis of the expandable portion for creating an incision in atherosclerotic material located within a blood vessel when the expandable portion is in the opened position and moved axially through the blood vessel ; and an inner sleeve that is supported for sliding movement within the catheter tube , the inner sleeve is connected between the control member on the handle assembly and a distal end of the expandable portion for selectively controlling movement of the struts (34A and 34B, 134A and 134B, 234A and 234B) between the closed position and the opened position; wherein the struts (34A and 34B, 134A and 134B, 234A and 234B) are respectively attached to one another at their opposite ends and bow outwardly in the opened position; wherein a portion of each strut (34A and 34B, 134A and 134B, 234A and 234B) remains generally flat along a length thereof in both the closed position and the opened position, and the incising element is supported on the flat portion of at least one strut (34A and 34B, 134A and 134B, 234A and 234B). a handle assembly including a control member that is movably supported thereon; a flexible catheter tube ; a selectively expandable portion extending from a distal end of the catheter tube and having a plurality of struts (34A and 34B, 134A and 134B, 234A and 234B) each defining an outer surface, the expandable portion being operable between a closed position, wherein the expandable portion has a first diameter (D1), and an opened position, wherein the expandable portion has a second diameter (D2) that is larger than the first diameter (D1); an incising element provided on the outer surface of at least one of the struts (34A and 34B, 134A and 134B, 234A and 234B), the incising element having a blade that extends outwardly in a radial direction from the outer surface of the strut (34A and 34B, 134A and 134B, 234A and 234B) and extends parallel with a longitudinal axis of the expandable portion for creating an incision in atherosclerotic material located within a blood vessel when the expandable portion is in the opened position and moved axially through the blood vessel ; and an inner sleeve that is supported for sliding movement within the catheter tube , the inner sleeve is connected between the control member on the handle assembly and a distal end of the expandable portion for selectively controlling movement of the struts (34A and 34B, 134A and 134B, 234A and 234B) between the closed position and the opened position; wherein the struts (34A and 34B, 134A and 134B, 234A and 234B) are respectively attached to one another at their opposite ends and bow outwardly in the opened position; wherein a portion of each strut (34A and 34B, 134A and 134B, 234A and 234B) remains generally flat along a length thereof in both the closed position and the opened position, and the incising element is supported on the flat portion of at least one strut (34A and 34B, 134A and 134B, 234A and 234B). <EOS>