Stent

Abstract

A stent ( 10 ) for transluminal implantation comprises a first, second and third stent section ( 11, 12, 13 ) for splinting and/or keeping open a hollow organ which are connected to each other via elastic tubular sections ( 14, 15 ). The stent ( 10 ) combines at least three different stent designs in one stent and can therefore be adjusted to the motion behavior of a hollow organ in an improved fashion (FIG. 1 ).

I CLAIM:  
     
         1 . Stent ( 10 ;  20 ;  30 ;  40 ) for splinting and/or keeping open a hollow organ, consisting of a tubular body having a diameter which can be changed through axial displacement of the ends of the body relative to each other, wherein the body has several stent sections ( 11 ,  12 ,  13 ;  21 ,  22 ,  23 ;  31 ,  32 ,  33 ;  41 ,  42 ,  43 ) of different cross-sections which can be expanded irrespectively of each other, comprise a woven, braided tubular web ( 16 ;  38 ) and/or one or more phase-shifted helices ( 26 ;  36 ;  46 ) in one or more planes which are connected to each other via web-free elastic tubular sections ( 14 ,  15 ;  24 ,  25 ;  34 ,  35 ;  44 ,  45 ).  
     
     
         2 . Stent according to  claim 1 , characterized in that the body is formed, in the unloaded expanded state, from a first stent section ( 11 ;  21 ;  31 ;  41 ) with a first diameter, a second and third stent section ( 12 ,  13 ;  22 ,  23 ;  32 ,  33 ;  42 ,  43 ) having a second and third diameter and from two elastic tubular sections ( 14 ,  15 ;  24 ,  25 ;  34 ,  35 ;  44 ,  45 ) which connect the first, second and third stent sections ( 11 ,  12 ,  13 ;  21 ,  22 ,  23 ;  31 ,  32 ,  33 ;  41 ,  42 ,  43 ).  
     
     
         3 . Stent according to  claim 1 , characterized in that the diameters of the stent sections ( 11 ,  12 ,  13 ;  21 ,  22 ,  23 ;  31 ,  32 ,  33 ;  41 ,  42 ,  43 ) are different.  
     
     
         4 . Stent according to  claim 1 , characterized in that when several helices ( 36 ,  46 ) are provided in several planes, at least one helix ( 36 ;  46 ) has an opposite winding direction  
     
     
         5 . Stent according to  claim 1 , characterized in that the elastic tubular sections ( 14 ,  15 ;  24 ,  25 ;  34 ,  35 ;  44 ,  45 ) are produced from a tissue-compatible plastic material and/or have different diameters in the unloaded state.  
     
     
         6 . Stent according to  claim 1 , characterized in that the body, viewed in cross-section, has a web ( 16 ;  38 ) in the first, second and third stent sections ( 11 ,  12 ,  13 ;  21 ,  22 ,  23 ;  31 ,  32 ,  3 ;  41 ,  42 ,  43 ) and/or one or more helices ( 26 ;  36 ,  46 ) which are surrounded by one or more elastic plastic layers which merge into the elastic tubular sections ( 14 ,  15 ;  24 ,  25 ;  34 , 35 ;  44 ,  45 ) in a material-bonding fashion without webs and helices.  
     
     
         7 . Stent according to  claim 1 , characterized in that the body has at least one filament ( 51 ) in the wall in the axial direction.  
     
     
         8 . Stent according to  claim 1 , characterized in that a thread ( 52 ) is worked into the proximal end region of the body, viewed over the periphery of the body, whose length projects past the stent ( 40 ).  
     
     
         9 . Stent according to  claim 1 , characterized in that the distal end of the body comprises a return valve, in particular a foil valve ( 50 ).  
     
     
         10 . Stent according to  claim 1 , characterized in that the tubular sections ( 14 ,  15 ;  24 ,  25 ;  34 ,  35 ;  44 ,  45 ) are made from thin, highly flexible and tear-proof plastic material e.g. silicon.