Rolled stent with waveform perforation pattern

Abstract

A stent fabricated from a rolled sheet. The sheet is perforated with wave form perforations to provide flexibility during insertion and in the body.

1 . A stent comprising: 
 a rolled sheet of material forming a tube having a plurality of layers, wherein said sheet is perforated with a plurality of perforations, said perforations are shaped as partial waveforms, and wherein perforations on each layer overlap perforations on each of the other layers to form gaps in the tube formed by the rolled sheet.    
   
   
       2 . The stent of  claim 1  wherein said rolled sheet of material is sized and proportioned to fit within a blood vessel of the brain of a patient.  
   
   
       3 . The stent of  claim 1  wherein the perforations comprise at least about 80% of the surface area of the rolled sheet.  
   
   
       4 . The stent of  claim 2  wherein the perforations comprise at least about 80% of the surface area of the rolled sheet.  
   
   
       5 . The stent of  claim 1  wherein the perforations are arranged in circumferentially extending bands around a circumference of the stent, and wherein a plurality of said circumferentially extending bands of perforations are disposed along the length of the stent.  
   
   
       6 . The stent of  claim 2  wherein the perforations are arranged in circumferentially extending bands around a circumference of the stent, and wherein a plurality of said circumferentially extending bands of perforations are disposed along the length of the stent.  
   
   
       7 . A stent comprising: 
 a rolled sheet of material forming a tube having first and second layers, wherein said sheet is perforated with a plurality of perforations, said perforations are shaped as partial waveforms, wherein perforations on the first layer overlap perforations on the second layer to form gaps in the tube formed by the rolled sheet, and wherein said rolled sheet of material is sized and proportioned to fit within a blood vessel of the brain of a patient.    
   
   
       8 . The stent of  claim 7  wherein the perforations comprise at least about 80% of the surface area of the rolled sheet.  
   
   
       9 . The stent of  claim 7  wherein the perforations are arranged in circumferentially extending bands around a circumference of the stent, and wherein a plurality of said circumferentially extending bands of perforations are disposed along the length of the stent.  
   
   
       10 . A stent comprising: 
 a sheet of material, said sheet being capable of rolling into a tubular structure having at least two layers, said sheet characterized by a transverse edge which, in the rolled tubular structure corresponds to the circumference of the stent, said sheet characterized by a longitudinal edge which, in the rolled tubular structure corresponds to the longitude of the stent;    said sheet being perforated by a plurality of perforations, said perforations shaped as sinusoidal waves, said perforations being placed on the sheet so that a first group of said perforations are circumferentially aligned along a first longitudinal location on the stent, and a second group of said perforations are circumferentially aligned along a second longitudinal location on the stent, and subsequent groups of perforations are likewise circumferentially aligned along the length of the stent, thus forming a plurality of generally circumferentially extending sinuous hoops connected by longitudinally extending staves in the stent;    said sheet being sized and proportioned to fit within a blood vessel of the brain of a patient.