Patent ID: 8608691

Claim:
A catheter assembly comprising: a hollow guiding catheter having a distal end and a proximal end; a hollow anchoring catheter extensible through the guiding catheter and having a distal end and a proximal end with a wall having an inner sheath and an outer sheath with an expandable material disposed therebetween the inner sheath and the outer sheath; a dilatation catheter extensible through the inner sheath of the anchoring catheter; a guide wire extending through the dilatation catheter and along which the dilatation catheter is slidable; a valve element attached to the guiding catheter having a valve opening therein through which the anchoring catheter is extensible; wherein when actuated the valve element secures the anchoring catheter therein and prevents back flow of blood; and wherein the inner sheath and outer sheath slide over each other to radially retract and expand the expandable material disposed between the inner and outer sheaths such that the inner sheath extends past the outer sheath to expose a section of the expandable material which radially expands to engage the guide catheter or a blood vessel.