Embolic coils with offset helical and twisted helical shapes
First Claim
1. A flexible, vaso-occlusive device for placement in a vascular lumen comprising a helically wound coil having two primary coil ends and a primary diameter, said helically wound coil being further wound into a relaxed secondary coil configuration end wherein the relaxed secondary coil configuration comprises at least two longitudinal focal axes generally parallel to each other extending between said first secondary coil end and said second secondary coil end wherein at least one loop of said helically wound coil extends radially and independently about each of said at least two longitudinal focal axes forming said relaxed secondary coil configuration.
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Accused Products
Abstract
This is a surgical device that, in particular, is for forming a vasoocclusion or embolism. Typically, it is a helically wound coil in which the helix is wound in such a way as to have multiple axially offset, longitudinal or focal axes. Another important facet of the invention is the presence of small diameter secondary coil windings adjacent large diameter coil windings. The device is sufficiently flexible and small that it may be delivered to a site within the vasculature of the human body using a pusher and a catheter. The device is generally linear when within the catheter but relaxes to form the multi-focal form after delivery from the distal end of the catheter lumen. Various mechanical connections may also be used to discharge the inventive coil from its pusher. Similarly, the coil may be attached to a pusher using a sacrificial joint, which sacrificial joint is dissolved by imposition of a small voltage within the human body. The device may be used alone or in conjunction with other coils or with a fibrous thrombotic attachments or the substrate to localize subsequent infusion of tissue adhesives, other particulate embolization devices, or chemotherapeutic agents in abnormal blood vessels and tissues.
387 Citations
23 Claims
- 1. A flexible, vaso-occlusive device for placement in a vascular lumen comprising a helically wound coil having two primary coil ends and a primary diameter, said helically wound coil being further wound into a relaxed secondary coil configuration end wherein the relaxed secondary coil configuration comprises at least two longitudinal focal axes generally parallel to each other extending between said first secondary coil end and said second secondary coil end wherein at least one loop of said helically wound coil extends radially and independently about each of said at least two longitudinal focal axes forming said relaxed secondary coil configuration.
- 15. A flexible, vaso-occlusive device for placement in a vascular lumen comprising a helically wound coil having a primary diameter, said helically wound coil being further wound into a relaxed secondary coil configuration having a first and second end and wherein the secondary coil configuration comprises at least two longitudinal focal axes extending between said first end and said second end and wherein multiple loops of said helically wound coil extend radially and independently about said at least two longitudinal focal axes which are generally parallel to each other.
Specification