selected embodiments of the present invention will now be explained with reference to the drawings . it will be apparent to those skilled in the art from this disclosure that the following description of the embodiments of the present invention is provided for illustration only , and not for the purpose of limiting the invention as defined by the appended claims and their equivalents . referring initially to fig1 , a catheter 1 is illustrated in accordance with a first embodiment of the present invention . the catheter 1 of the present invention basically comprises a catheter shaft 2 provided with a proximal end 3 and a distal end 4 , which are shown in fig1 in a strongly shortened condition . a balloon 24 , which is only illustrated schematically , is secured to the distal end 4 . furthermore , the catheter 1 comprises a fitting 5 which is normally designed as a luer fitting . the fitting 5 is secured to the proximal end 3 of the catheter shaft 2 and may comprise a housing 25 of a standard construction with a passageway 26 in flow communication with the catheter shaft 2 . the fitting 5 is connected to a pressure device ( inflation device ) for expanding the balloon 24 . the proximal end 3 of the catheter shaft 2 of the catheter 1 according to the invention is provided with a bending section 6 having a flexibility greater than that of the section 3 ′ of the catheter shaft 2 joining the proximal end 3 . said bending section 6 prevents unintended kinking in the way explained at the outset . in the embodiment which is shown in fig1 and particularly preferred , the bending section 6 is designed as a spiral 7 that is cut into the catheter shaft 2 and formed with a selectable number of spiral sections . for preventing liquid from exiting , the spiral 7 is provided with a seal 8 which may be designed as a sleeve or tube that is secured , preferably by an adhesive , to the proximal section 3 . as illustrated in fig1 , the proximal end 3 is connected with its bending section 6 and the seal 8 arranged thereabove to a transition member 16 of the fitting 5 , so that the region of the catheter shaft 2 that is prone to kinking is protected from unintended kinking fig2 and 3 show alternative embodiments of the bending section 6 . in the embodiment shown in fig2 , the bending section 6 is formed at the proximal end 3 by a plurality of offset slits , which in the exemplary case are represented by two slits 9 and 11 . the slits 9 and 11 extend up to webs 10 and 12 , respectively , the arrangement of which yields the offset . the slits can be adapted in their dimensions ( length , width , angular position ) to different conditions of use . in fig3 , the bending section 6 is also formed at the proximal end 3 by a plurality of offset slits 13 , 14 and 15 , which in this embodiment do not extend in circumferential direction as in fig2 , but extend essentially in the longitudinal direction of the proximal end 3 . the slits 13 and 15 have two slit sections , of which one extends into the edge portion of the proximal end 3 while the slit 14 comprises three slit sections arranged at an angle relative to one another between slits 13 and 15 . referring now to fig4 and 5 , a catheter 1 in accordance with a second embodiment will now be explained . hi view of the similarity between the first and second embodiments , the parts of the second embodiment that are identical to the parts of the first embodiment will be given the same reference numerals as the parts of the first embodiment . moreover , the descriptions of the parts of the second embodiment that are identical to the parts of the first embodiment may be omitted for the sake of brevity . reference can here be made to the above explanations . in the embodiment according to fig4 , the transition member 16 is formed as a flexible plastic section of the fitting 5 that is connected to the proximal end 3 of the catheter shaft 2 . the detail according to fig5 shows an undercut 17 which can be engaged by a holding member 18 of the proximal end 3 of the catheter shaft 2 for fixing the catheter shaft 2 . referring now to fig6 , a catheter 1 in accordance with a third embodiment will now be explained . in view of the similarity between the third and prior embodiments , the parts of the third embodiment that are identical to the parts of the prior embodiments will be given the same reference numerals as the parts of the prior embodiments . moreover , the descriptions of the parts of the second embodiment that are identical to the parts of the first embodiment may be omitted for the sake of brevity . reference can here be made to the above explanations . in this embodiment , the bending section 6 comprises a plurality of balls 19 to 23 mounted on the proximal end 3 . said balls can be fixed to the catheter shaft 2 by way of different fastening possibilities as have been explained at the outset . in the embodiment shown in fig6 , a heat shrinkable tube 27 is provided for this purpose , said tube being connected at one end to the catheter shaft 2 and fixed at the other end to the fitting 5 . fig7 and 8 illustrate the function of the embodiment with reference to two balls 19 and 20 . it becomes apparent that the balls can be dimensioned in their distance d and in their radius r ( see fig9 ) in such a way that a maximally acceptable bending angle a ( see fig9 ) is made possible . this angle a does not entail any plastic deformation and thus kinking or even breaking of the catheter shaft . catheters without a balloon shall also be regarded as catheters according to the invention . the terms of degree such as “ substantially ”, “ about ” and “ approximately ” as used herein mean a reasonable amount of deviation of the modified term such that the end result is not significantly changed . these terms should be construed as including a deviation of at least −± 5 % of the modified term if this deviation would not negate the meaning of the word it modifies . this application claims priority to european patent application no . 02027767 . 9 : the entire disclosure of european patent application no . 02027767 . 9 is hereby incorporated herein by reference . while only selected embodiments have been chosen to illustrate the present invention , it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made herein without departing from the scope of the invention as defined in the appended claims . furthermore , the foregoing descriptions of the embodiments according to the present invention are provided for illustration only , and not for the purpose of limiting the invention as defined by the appended claims and their equivalents .
a catheter is configured to prevent kinking of a catheter during handling or mounting of a pressure device . the catheter has a proximal end of its catheter shaft that is provided with a bending section having a flexibility greater than that of the section of the catheter shaft joining the proximal end .