Catheter assembly

Claim 1

A catheter assembly for the treatment of vessels carrying body fluid, comprising: an inner catheter provided with a guidewire lumen for receiving a guidewire and an inflation lumen for a balloon provided at its distal end, an outer catheter provided with an inflation lumen for a balloon provided at its distal end and a lumen in which the inner catheter is applied shiftable for changing the spacing of said two balloons and which features a larger cross-section than that of said inner catheter so that between the outer wall of said inner catheter and the inner wall of said outer catheter a cross-section employable as an inflation lumen exists and ports into the portion sited between said two balloons, wherein said guidewire lumen of said inner catheter is connected to said portion sited between said two balloons via ports in said catheter wall, said guidewire lumen is dimensioned cross-sectionally so that it can be used as said inflation lumen also when said guidewire is in the lying position, said guidewire is provided at its distal end with an occlusion element for closing off said port located at the distal end of said guidewire lumen.