Abstract: The balloon catheter comprises a catheter tube (10) provided with a high pressure balloon (14) designed for performing a vessel dilatation. Further provided is at least one low pressure balloon (17) joining the high pressure balloon (14) and expanded with a lower pressure. Thereby, the stress acting on the blood vessel at the ends of the high pressure balloon (14) or a stent (20) is decreased, thus reducing the danger of dissections of the vessel wall.

Abstract: The inventive expansion catheter has a catheter tube (11) and a perfusion tube (12) which can be moved inside the catheter tube (11). The perfusion tube (12) is connected to a stent (13) formed of a wire-type material. The stent (13) is constricted by the catheter tube (11). When, the catheter tube (11) is withdrawn, the stent (13) expands, hereby taking up two expansion areas, (16, 18) which border an area (26) to be protected from the pressure of the blood. A bypass (28) can be fixed in this area (26) by means of an anastomosis (27). The perfusion tube (26) ensures that the blood vessel (21) is supplied behind the obturation point so that the operation can be carried out as non-invasively as possible while the heart is beating.

Abstract: The balloon catheter has a catheter hose (10) and a hydraulically expandable balloon (14) on a balloon support (13). Between the catheter hose (10) and the catheter support (13), there is a small-diameter pump (16) which takes blood in through lateral inlets (21) and pumps it through the tubular balloon support (13). The pump (16) is driven by a flexible shaft (23) running through the catheter hose (10) or by a directly integrated micromotor.