Kink-proof balloon catheter

A balloon catheter comprising a shaft extending in the longitudinal direction, the shaft having at least a first and a second section, with the first section being arranged distal to the second section and being more flexible than the second section, with the shaft being provided with a first and a second hose-like tube and a balloon being arranged at a distal end of the first tube, said balloon being expandable by pressurization with a fluid led through said first tube, and said second tube serving for accommodating a guidewire and terminating distally of said balloon and being provided with an opening at a distal end of the second tube, wherein both said first and second tubes extend along said first and second sections, and both said first and second tubes are more flexible in said first section than in said second section, wherein a transition section is arranged between said first and second sections, in which a transition takes place at a distal and a proximal end of the transition section, wherein said transition section is a single transition section of predetermined length, wherein at both the distal and proximal ends of the transition section, only the properties of one of the tubes change, but not the properties of the other tube, wherein only one of the following applies:

• (i) within the transition section the first tube has the same material properties as in the first section and the second tube has the same material properties as in the second section and
• (ii) within the transition section the first tube has the same material properties as in the second section and the second tube has the same material properties as in the first section.