Endovascular coil and method for making the same
AssigneeAvantec Vascular Corporation
InventorsJohn Thao To, Ryan Masato Hoshino, Teresa Ruvalcaba
Life of this patent
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Abstract
Disclosed are example embodiments of an endovascular coil having a twisted figure 8 shape. The endovascular coil includes: a first loop; a second loop; and an inflection region where a portion of the first loop transitions into a portion of the second loop. The second loop is rotated about an axis parallel to the longitudinal axis of the first loop to create the twisted figure 8 shape. The twist adds more randomness and variability to the filling behavior of the endovascular coil. The added randomness and variability enables the twisted figure 8 coil to better fill the void of irregular-shaped aneurysms than other conventional embolic coils.
Claims13
An embolic coil consisting essentially of:
- a wire formed into a coil having the shape of a stacked plurality of at least 3 twisted figure 8 configurations around a mandrel consisting essentially of a parallel set of rods, wherein, each figure 8 configuration in the plurality has
- a respective first loop;
- a respective second loop;
- a respective inflection area between the respective first loop and the respective second loop;
- a respective focal point;
- and,
- a respective common axis of both the respective first loop and the respective second loop on the mandrel, such that the stack of figure 8 configurations has
- all respective first loops in a single stack;
- all respective second loops in a single stack;
- all respective inflection areas in a single stack;
- all respective focal points in a single stack;
- and,
- all respective common axes in a single stack;
- wherein,
- the coil includes a desired offset angle ranging from 5 degrees to 45 degrees induced from a rotation between the stack of the respective first loops and the stack of respective second loops, the rotation
- (i) occurring
- on the mandrel by rotating the rods of the mandrel away from the parallel in an amount ranging from the 5 degrees to the 45 degrees away from the parallel at the region between the single stack of all respective first loops and the single stack of all respective second loops, each of the respective first loops having it's respective second loop (i) initially on substantially the same plane as the respective first loop before the rotation and (ii) at the desired offset angle after the rotation;
- and,
- at the stack of the respective focal points in the stack of respective inflection areas and around the stack of the respective common axes, and (ii);
- wherein, the rotation creates the twisting of the shape of the stacked plurality of figure 8 configurations into the stacked plurality of twisted figure 8 configurations;
- the shape of the wire is heat set into the stacked plurality of twisted figure 8 configurations at the desired angle of rotation;
- and,
- the coil effectively supports irregular-shaped and multi-lobe aneurysms after removal from the mandrel and insertion into the aneurysms.
Dependencies are inferred from the claim text.