Flexible vascular occluding device

Abstract

A vascular occluding device for modifying blood flow in a vessel, while maintaining blood flow to the surrounding tissue. The occluding device includes a flexible, easily compressible and bendable occluding device that is particularly suited for treating aneurysms in the brain. The neurovascular occluding device can be deployed using a micro-catheter. The occluding device can be formed by braiding wires in a helical fashion and can have varying lattice densities along the length of the occluding device. The occluding device could also have different lattice densities for surfaces on the same radial plane.

1 . A tubular-shaped device for positioning within a blood vessel for embolization of an aneurysm, the device including a plurality of strands of helically-wound material in a lattice structure forming a plurality of braiding elements, wherein a width of a braiding element is based on the number of strands of helically-wound material.  
   
   
       2 . The device of  claim 1  wherein the width of the braiding element is proportional to a constant.  
   
   
       3 . The device of  claim 2  wherein the constant is equal to π.  
   
   
       4 . The device of  claim 1 , wherein the width of the braiding element is about equal to [(π)*(a diameter of a forming device)]/(number of strands of helically-wound material/2).  
   
   
       5 . The device of  claim 1 , wherein the braiding elements contain at least two sides forming a ribbon angle, the ribbon angle based on the width of the braiding element.  
   
   
       6 . The device of  claim 5  wherein the ribbon angle is selectively configured based on a predetermined width of the braiding element.  
   
   
       7 . The device of  claim 5  wherein the ribbon angle is further configured for fitting the device in a vessel of a predetermined diameter.  
   
   
       8 . The device of  claim 7  wherein a size of the ribbon angle is directly proportional to a size of the width of the braiding element.  
   
   
       9 . The device of  claim 1  further including a protective coil encompassing the device.  
   
   
       10 . The device of  claim 9  wherein the number of strands of helically wound material is based on the protective coil encompassing the device.  
   
   
       11 . The device of  claim 10  wherein the number of strands of helically wound material is about equal to or less than (720 degrees)/(Arc-angle), wherein the arc-angle is defined by an angle at a center point of the protective coil formed by the width of the braiding element at a peripheral surface of the protective coil.  
   
   
       12 . A method for manufacturing a device in a circular coil for positioning within a blood vessel for embolization of an aneurysm, the device including a plurality of interlacing ribbons, the method comprising the steps of: 
 positioning a ribbon in the coil;    providing a plurality of ribbons for the device based on a calculated arc-angle of said positioned ribbon;    interlacing said ribbons to form the device.    
   
   
       13 . The method of  claim 12  wherein the step of positioning the ribbon in the coil comprises: 
 placing a first ribbon in contact with an inner surface of the coil;    determining an inner circumference tangent to a bottom surface of the first ribbon; positioning a second ribbon in contact with the inner circumference,    wherein the step of calculating the arc-angle is based on the second ribbon.    
   
   
       14 . The method of  claim 13  wherein the arc-angle is defined by an angle at a center point of the protective coil formed by the width of the second ribbon.  
   
   
       15 . The method of  claim 12  wherein the plurality of ribbons is greater than or equal to 8.  
   
   
       16 . The method of  claim 15  wherein the plurality of ribbons is greater than or equal to 32.  
   
   
       17 . The method of  claim 16  wherein the plurality of ribbons is 48.  
   
   
       18 . The method of  claim 16  wherein the plurality of ribbons is 60.  
   
   
       19 . The method of  claim 16  wherein the plurality of ribbons is greater than 60.