Stent for bifurcation, a system for intravascular implantation of the stent for bifurcation and a method of implantation of the stent for bifurcation

Abstract

A stent for bifurcation, including two cylindrical parts: a distal part ( 1.1 ) of smaller diameter and a proximal part ( 1.2 ) of greater diameter, connected by two—arranged as opposite—longitudinal connectors ( 1.3 ) having length (L 1 ) of 0.5 to 8 mm and forming a cell of the stent having an enlarged surface area ( 1.4 ), the connectors having a curvilinear shape, in particular a sinusoidal shape.

1 . A stent for bifurcation, comprising two cylindrical parts:
 a distal part of smaller diameter and a proximal part of greater diameter, connected by two longitudinal connectors, arranged as opposite, having a length of 0.5 to 8 mm and forming a cell of the stent having an enlarged surface area, wherein the connectors have a curvilinear shape, in particular a sinusoidal shape.   
     
     
         2 . A stent of  claim 1 , wherein a ratio of the distal part diameter to the proximal part diameter of the stent is within the limits of 1.0:1.1 to 1.0:2.0. 
     
     
         3 . A system for intravascular implantation of the stent for bifurcation, comprising:
 a proximal part and a distal part including an external tube, an internal tube and a profiled balloon, wherein in the distal part of the system, on the internal tube marked with three marker bands, visible at X-rays, there is the profiled balloon fastened with a proximal part to the external surface of the external tube and with a distal part—to the external surface of the internal tube; and   the stent for bifurcation of  claim 1  is clamped on the profiled balloon in a detachable way, the profiled balloon including three non-separable parts—the distal part, of smaller diameter, the proximal part, of greater diameter, and a medial part having length from 0.5 to 8 mm, located between the distal part and the proximal part, position of the marker band coinciding with the proximal edge of the distal part of the stent clamped on the balloon.   
     
     
         4 . A system of  claim 3 , wherein a ratio of the distal part diameter to the proximal part diameter of the profiled balloon is within the limits of 1.0: 1.1 to 1.0: 2.0. 
     
     
         5 . A system of  claim 3 , wherein between long edges of the distal part of the profiled balloon and an edge of the medial part of the profiled balloon there is an angle θ that lies within the limits of 15° to 65°. 
     
     
         6 . A system of  claim 3 , wherein upon clamping the stent for bifurcation in a separable way on the profiled balloon, the cell having an enlarged surface area of the stent for bifurcation, coincides with the medial part of the profiled balloon. 
     
     
         7 . A method of introducing and positioning the stent for bifurcation by means of the intravascular system including such the stent, wherein the guide wire is introduced to the main branch of the vessel at bifurcation site, upon which at bifurcation site, the system defined in  claim 3  including the stent defined in  claim 1  is introduced, the marker band visible at X-rays signaling the position of edges of the proximal distal part of the stent clamped on the balloon being positioned precisely at a site, where a carina tip of the vessel is situated, so that the distal part of the stent is situated behind a fork of the artery, in the main branch, the proximal part of the stent is situated before the fork of an artery, and the medial part of the stent, with the cell of the stent having a special, enlarged surface area, being positioned in a lumen of the side branch of the vessel, and then fluid under pressure of 6 to 20 atm is introduced to the balloon, the stent is implanted, the fluid is removed from the balloon and the system and the guide wire are withdrawn.