Implant, a mandrel, and a method of forming an implant
First Claim
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1. An implant comprising:
- a coil having a coil length that is biased to conform to a winding pattern, the coil comprising a primary, substantially linear configuration for delivery of the coil to a vascular site, and a secondary, substantially spherical configuration in an unrestrained state for positioning at said vascular site, the winding pattern approximately conforming to an outer surface of a sphere, the winding pattern consisting of only substantially triangular shapes, each triangular shape having a center, four of the triangular shapes having sides that bow outward away from the center, four of the triangular shapes having sides that bow inward towards the center, the coil comprising a proximal end, a distal end, and a longitudinal axis that, when the coil is in the linear configuration, extends from the proximal end to the distal end, the coil formed by winding about a mandrel and twisting the proximal end at least half a turn with respect to the distal end about the longitudinal axis.
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Abstract
This invention is directed to an implant having a coil for embolizing a vascular site, such as aneurysm. The coil has a specific three-dimensional shape that is achieved by winding the coil around a mandrel in a specific pattern and then heat setting the coil and the mandrel, another aspect of the invention. The three-dimensional shape resembles unclosed mobius loops. Also provided are methods of making the coil and methods of embolizing vascular site.
572 Citations
16 Claims
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1. An implant comprising:
a coil having a coil length that is biased to conform to a winding pattern, the coil comprising a primary, substantially linear configuration for delivery of the coil to a vascular site, and a secondary, substantially spherical configuration in an unrestrained state for positioning at said vascular site, the winding pattern approximately conforming to an outer surface of a sphere, the winding pattern consisting of only substantially triangular shapes, each triangular shape having a center, four of the triangular shapes having sides that bow outward away from the center, four of the triangular shapes having sides that bow inward towards the center, the coil comprising a proximal end, a distal end, and a longitudinal axis that, when the coil is in the linear configuration, extends from the proximal end to the distal end, the coil formed by winding about a mandrel and twisting the proximal end at least half a turn with respect to the distal end about the longitudinal axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An implant comprising:
a coil having a coil length that is biased to conform to a winding pattern, the coil comprising a primary, substantially linear configuration for delivery of the coil to a vascular site, and a secondary, substantially spherical configuration in an unrestrained state for positioning at said vascular site, the winding pattern approximately conforming to an outer surface of a sphere, the winding pattern consisting of only substantially triangular shapes, each triangular shape having a center, four of the triangular shapes having sides that bow outward away from the center, four of the triangular shapes having sides that bow inward towards the center. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
Specification