An intravascular catheter device for the treatment of atherosclerotic material located within a blood vessel comprising: a flexible catheter tube (130, 230, 330); a handle assembly secured to a proximal end of said catheter tube ( 130, 230, 330) and comprising a control member that is moveably supported thereon; an expandable portion ( 132, 232, 332) secured to a distal end of said catheter tube ( 130, 230, 330) and comprising a plurality of struts ( 134A, 134B, 134C, 134D, 234A, 234B, 334A, 334B) each defining an outward facing surface, the expandable portion ( 132, 232, 332) being operable between a closed position, wherein the expandable portion ( 132, 232, 332) has a first diameter, and an opened position, wherein the expandable portion ( 132, 232, 332) has a second diameter that is larger than the first diameter; an inner sleeve ( 140, 240, 340) disposed within the catheter tube (130, 230, 330) wherein said inner sleeve ( 140, 240, 340) is supported for sliding movement within the catheter tube ( 130, 230, 330), is configured to accommodate a guide wire ( 152, 252, 352), and is connected between the control member and a distal end of the expandable portion ( 132, 232, 332) such that the inner sleeve (130, 230, 330) is configured to move the expandable portion ( 132,232,332) between the opened and the closed positions; a tip member ( 136, 236, 336) forming the distal end of the expandable portion (132, 232, 332) and attached to the inner sleeve 140, 240, 340) and the struts ( 134A, 134B, 134C, 134D, 234A, 234B, 334A, 334B) so as to move the struts ( 134A, 134B, 134C, 134D, 234A, 234B, 334A, 334B) between the closed position and the opened position when the tip member ( 136, 236, 336) is extended or retracted relative to the catheter tube (130, 230, 330); an incising element ( 136, 236, 336) provided on and extending from the outward facing surface of at least one of the struts ( 134A, 134B, 134C, 134D, 234A, 234B, 334A, 334B), the incising element ( 136, 236, 336) having a sharpened edge located along an upper edge thereof wherein said sharpened edge extends in parallel with a longitudinal axis of the expandable portion ( 132, 232, 332) when the expandable portion (132, 232, 332) is in the closed position; characterised in that an abrasive surface (142, 242, 342) located on at least one of the struts ( 134A, 134B, 134C, 134D, 234A, 234B, 334A, 334B) is configured to abrade atherosclerotic material by axial movement of the expandable portion ( 132, 232, 332) through the blood vessel while the expandable portion ( 132, 232, 332) is in the opened position. a flexible catheter tube (130, 230, 330); a handle assembly secured to a proximal end of said catheter tube ( 130, 230, 330) and comprising a control member that is moveably supported thereon; an expandable portion ( 132, 232, 332) secured to a distal end of said catheter tube ( 130, 230, 330) and comprising a plurality of struts ( 134A, 134B, 134C, 134D, 234A, 234B, 334A, 334B) each defining an outward facing surface, the expandable portion ( 132, 232, 332) being operable between a closed position, wherein the expandable portion ( 132, 232, 332) has a first diameter, and an opened position, wherein the expandable portion ( 132, 232, 332) has a second diameter that is larger than the first diameter; an inner sleeve ( 140, 240, 340) disposed within the catheter tube (130, 230, 330) wherein said inner sleeve ( 140, 240, 340) is supported for sliding movement within the catheter tube ( 130, 230, 330), is configured to accommodate a guide wire ( 152, 252, 352), and is connected between the control member and a distal end of the expandable portion ( 132, 232, 332) such that the inner sleeve (130, 230, 330) is configured to move the expandable portion ( 132,232,332) between the opened and the closed positions; a tip member ( 136, 236, 336) forming the distal end of the expandable portion (132, 232, 332) and attached to the inner sleeve 140, 240, 340) and the struts ( 134A, 134B, 134C, 134D, 234A, 234B, 334A, 334B) so as to move the struts ( 134A, 134B, 134C, 134D, 234A, 234B, 334A, 334B) between the closed position and the opened position when the tip member ( 136, 236, 336) is extended or retracted relative to the catheter tube (130, 230, 330); an incising element ( 136, 236, 336) provided on and extending from the outward facing surface of at least one of the struts ( 134A, 134B, 134C, 134D, 234A, 234B, 334A, 334B), the incising element ( 136, 236, 336) having a sharpened edge located along an upper edge thereof wherein said sharpened edge extends in parallel with a longitudinal axis of the expandable portion ( 132, 232, 332) when the expandable portion (132, 232, 332) is in the closed position; characterised in that an abrasive surface (142, 242, 342) located on at least one of the struts ( 134A, 134B, 134C, 134D, 234A, 234B, 334A, 334B) is configured to abrade atherosclerotic material by axial movement of the expandable portion ( 132, 232, 332) through the blood vessel while the expandable portion ( 132, 232, 332) is in the opened position.