Patent ID: 8858585

Claim:
A device for the reduction or the removal of a stenosis present in a blood vessel, comprising: a working catheter with a lumen which defines a first working channel extending from a distal end up to a proximal end of the working catheter for the introduction of an instrument for the reduction or the removal of the stenosis; and a balloon catheter which is separate from the working catheter, comprising: a sealing balloon in the region of a distal end of the balloon catheter; a first lumen connected to the sealing balloon for the dilation of the sealing balloon; and a second, separate lumen which defines a second working channel extending from the distal end of the balloon catheter up to a proximal end of the balloon catheter, wherein the sealing balloon, when dilated, comprises an asymmetrical cross-section configured to engage laterally around a distal end region of the working catheter so that, when the working catheter and the balloon catheter are introduced next to one another into the blood vessel, a seal is formed by the dilated sealing balloon between outer sides of the working catheter, the balloon catheter and an inner wall of the blood vessel.