# US 5,700,258 A · Complex coils having fibered centers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,700,258 A - Document ID: US5700258A - Status: Granted - Kind: A - Application number: 08/540,354 - Filed: 1995-09-29 - Granted: 1997-12-23 - Earliest claimed: 1994-06-24 - Assignees: Target Therapeutics, Inc. - Inventors: Gregory E. Mirigian; Nga Thi Van; Son M. Gia - Web page: https://patentgrep.com/patent/US5700258A ## CPC - A61B 17/12145: {having a pre-set deployed three-dimensional shape (methods of manufacturing A61B2017/00526)} - A61B 17/12022: {Occluding by internal devices, e.g. balloons or releasable wires (plugging an opening in the wall of an organ A61B17/0057; occluders for the cervical canal A61F6/146; vas deferens occluders A61F6/20)} - A61B 17/1215: {comprising additional materials, e.g. thrombogenic, having filaments, having fibers, being coated} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A vasoocclusive coil for placement in the vasculature of an animal to form thrombus in a selected site such as an aneurysm or AVM. The device involves a primary coil form having thrombogenic fibers placed on the coil in a specified fashion. The coil will pass through the lumen of a vascular catheter in the primary coil form and evolve into a convoluted or complex secondary form when ejected from the catheter's distal end. The fibers are attached to the coil and cooperate with the coil so that upon ejection from the catheter, the convoluted coil forms a shape in which the central region or secondary coil form center that contains the majority of these fibers. ## Claims ### Claim 1 A vasoocclusive device comprising: (a) a coil having helical windings extending between a first end and a second end, a primary coil axis extending between said first end and a second end, and defining a primary coil form, said primary coil form being self-forming into a selected secondary coil form with a secondary coil form interior, and (b) at least one fibrous element affixed to said coil and located with respect to said primary coil form so that upon said self-forming into said selected secondary coil form, the majority of said at least one fibrous element resides within said secondary coil form interior. ### Claim 2 (depends on 1) The vasoocclusive device of claim 1 wherein the at least one fibrous element comprises: (b) a first fibrous element having a first end and a second end, with the portion of the first fibrous element between these ends extending axially along the coil and having forming first fibrous element discrete sections defined by threading said first fibrous element about a helical coil winding at chosen intervals along said helical coil, and (c) at least one supplemental fibrous element having a first end and a second end, with the portion of the supplemental fibrous element between those ends extending axially along the coil and having forming second fibrous element discrete sections defined by threading said supplemental fibrous element about a helical coil winding at chosen intervals along said helical coil different than the intervals chosen for said first fibrous element. ### Claim 3 (depends on 2) The vasoocclusive device of claim 2 wherein said at least one supplemental fibrous element comprises one fibrous element. ### Claim 4 (depends on 3) The vasoocclusive device of claim 3 wherein the chosen intervals for said supplemental fibrous element comprises intervals longer than the chosen intervals for said first fibrous element. ### Claim 5 (depends on 2) The vasoocclusive device of claim 2 wherein said first and supplemental fibrous elements are threaded through the helical coil in a quadrant measured generally perpendicular to the coil axis. ### Claim 6 (depends on 2) The vasoocclusive device of claim 2 wherein said fibrous element and said at least one supplemental fibrous element comprise fibers selected from silk, cotton, polyethylene terephthalate, polylactic acid, polyglycolic acid, polyesters, fluorocarbons, and polyaramids. ### Claim 7 (depends on 6) The vasoocclusive device of claim 6 wherein the fibers are polyethylene terephthalate. ### Claim 8 (depends on 2) The vasoocclusive device of claim 2 wherein the secondary coil form interior contains at least about 65% of the first fibrous element and at least one supplemental fibrous element. ### Claim 9 (depends on 1) The vasoocclusive device of claim 1 wherein the secondary coil form interior contains at least about 65% of the at least one fibrous element. ### Claim 10 (depends on 1) The vasoocclusive device of claim 1 wherein the secondary coil form interior contains at least about 85% of the at least one fibrous element. ### Claim 11 (depends on 1) The vasoocclusive device of claim 1 wherein said at least one fibrous element comprises a multiplicity of fibrillar tufts extending radially from the primary coil axis. ### Claim 12 (depends on 11) The vasoocclusive device of claim 11 wherein the multiplicity of fibrillar tufts extending radially from the primary coil axis are inserted around said helical windings. ### Claim 13 (depends on 12) The vasoocclusive device of claim 12 wherein the multiplicity of fibrillar tufts extending radially from the primary coil axis are inserted around said helical windings in a quadrant measured generally perpendicular to the coil axis. ### Claim 14 (depends on 1) The vasoocclusive device of claim 1 wherein fibers are located along only a portion of the axis of the primary coil form and that portion of the primary coil form resides within said secondary coil form interior upon said self-forming.