Asymmetric bifurcated crown

Abstract

An expandable stent for percutaneous procedures comprises a tubular structure disposed about a longitudinal axis and a plurality of fingers. The plurality of fingers, upon expansion of the stent, extends from the tubular structure about a second longitudinal axis which is angularly offset from the first longitudinal axis. At least one of the plurality of fingers has a length that is greater than that of the other fingers.

1 . A bifurcation stent having an unexpanded configuration and an expanded configuration, in the unexpanded configuration the bifurcation stent comprising:
 a main stent body comprising a bifurcation crown, the bifurcation crown comprising a first portion and a second portion;
 the first portion comprising a first plurality of fingers and the second portion comprising a second plurality of fingers, wherein the first plurality of fingers is opposed to the second plurality of fingers across the bifurcation crown and the first plurality of fingers has an average length that is greater than the average length of the second plurality of fingers. 
   
   
   
       2 . The bifurcation stent of  claim 1 , wherein, in an unexpanded configuration, at least a majority of the first plurality of fingers and at least a majority of the second plurality of fingers extend in a longitudinal direction relative to the main body of the bifurcation stent. 
   
   
       3 . The bifurcation stent of  claim 1 , wherein, in the unexpanded configuration, at least one of the first plurality of fingers overlaps at least one of the second plurality of fingers. 
   
   
       4 . The bifurcation stent of  claim 1 , wherein, in the unexpanded configuration, at least one of the fingers of the first plurality of fingers is interlaced with at least one of the fingers of the second plurality of fingers. 
   
   
       5 . The bifurcation stent of  claim 1 , wherein, in an unexpanded configuration, at least one of the fingers of the first plurality of fingers and at least one of the fingers of the second plurality of fingers extend at an oblique angle relative to the longitudinal direction of the main body of the bifurcation stent. 
   
   
       6 . A stent comprising:
 a bifurcation crown comprising a distal portion and a proximal portion, the distal portion configured to engage the carina of a body lumen, the proximal portion configured to engage a portion of the body lumen contralateral to the carina,   the distal portion comprising a plurality of distally extending fingers, the proximal portion comprising a plurality of proximally extending fingers, the plurality of distally extending fingers including a shortest finger and the plurality of proximally extending fingers including a longest finger, wherein the fingers between the shortest finger and the longest finger successively increase in length and the fingers between the longest finger and the shortest finger successively decrease in length.   
   
   
       7 . The bifurcation stent of  claim 6 , wherein each of the fingers of the plurality of proximally extending fingers and the plurality of distally extending fingers is less than 5.5 mm in length. 
   
   
       8 . The bifurcation stent of  claim 6  further comprising an expanded configuration and an unexpanded configuration, wherein in the unexpanded configuration, at least one of the plurality of proximally extending fingers overlaps at least one of the distally extending fingers. 
   
   
       9 . The bifurcation stent of  claim 6 , wherein the proximal portion comprises between five and twelve fingers and the distal portion comprises between five and twelve fingers. 
   
   
       10 . The bifurcation stent of  claim 6 , further comprising an unexpanded configuration and an expanded configuration, wherein in the expanded configuration, each of the fingers of the plurality of distally extending fingers and plurality of proximally extending fingers extend along a secondary lumen and terminate along a common plane that is orthogonal to the secondary lumen. 
   
   
       11 . A bifurcation stent have an unexpanded configuration and an expanded configuration, the bifurcation stent comprising:
 a primary tubular body having a side branch opening, the side branch opening defining a bifurcation crown, the bifurcation crown having a proximal portion and a distal portion, each of the proximal and distal portions having a plurality of fingers that extend at least partially across the side branch opening when the bifurcation stent is in the unexpanded configuration, the fingers of the plurality of fingers of the proximal portion being generally disposed opposite to fingers of the fingers of the distal portion, wherein the branch opening is asymmetric such that the fingers of the proximal portion extend further across the side branch opening than the opposing fingers of the distal portion.   
   
   
       12 . The bifurcation stent of  claim 11 , wherein at least one of the plurality of fingers of the proximal portion overlaps at least one of the opposing fingers of the distal portion. 
   
   
       13 . The bifurcation stent of  claim 11 , wherein, in the expanded configuration, each of the plurality of fingers of the proximal portion and each of the plurality of fingers of the distal portion extend along a secondary lumen and terminate along a common plane that is orthogonal to the secondary lumen. 
   
   
       14 . The bifurcation stent of  claim 11 , wherein the plurality of fingers of the proximal portion comprises between five and twelve fingers and the plurality of fingers of the distal portion comprises between five and twelve fingers. 
   
   
       15 . The bifurcation stent of  claim 14 , wherein the bifurcation stent is balloon expandable.