Vasoocclusion coil having a polymer tip

• US 5,690,667 A
• Filed: 09/26/1996
• Issued: 11/25/1997
• Est. Priority Date: 09/26/1996
• Status: Expired due to Term

• Current Assignee: Stryker European Operations Holdings, LLC (Stryker Corporation)
• Original Assignee: Target Therapeutics, Inc. (Boston Scientific Corporation)
• Inventors: Gia, Son M.
• Primary Examiner(s): Jackson, Gary
• Application Number:
  US08/721,351
• Time in Patent Office: 425 Days
• Field of Search: 606/108, 606/191, 606/194, 606/200, 604/104, 604/52
• US Class Current: 606/191
• CPC Class Codes: 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
• CPC Class Codes: A61B 17/12145 having a pre-set deployed three-dimensional shape methods of manufacturing A61B2017/00526
• CPC Class Codes: A61B 17/1215 comprising additional materials, e.g. thrombogenic, having filaments, having fibers, being coated

Abstract

A vasoocclusive helical metal coil having a thermoplastic polymer plug in at least one of its ends that has been melted so that it molds to the coil windings and insulates and blunts the end(s).

Claims

1. A vasoocclusion coil comprising a helical coil having a multiplicity of windings that define a lumen, a first end and a second end, and a plug of thermoplastic biocompatible polymer comprised of a first portion that extends into the lumen at said first end and is molded into the windings defining said first end and a second rounded portion that extends axially outwardly from said lumen at said first end.

2. The vasoocclusion coil of claim 1 wherein the polymer is a polyester.

3. The vasoocclusion coil of claim 1 wherein the windings are made of metal.

4. The vasoocclusion coil of claim 1 wherein said first portion extends 1 to 5 windings into the lumen.

5. The vasoocclusion coil of claim 1 including a sheath of a thermoplastic biocompatible polymer that encases and is molded to the exterior surface of the windings defining the first end.

6. The vasoocclusion coil of claim 1 further comprising a strand of said polymer having a first end connected to the first portion of the plug, a second end, and a segment intermediate said first and second ends that extends axially along the coil in a generally serpentine configuration composed of loops that extend through the coil windings at spaced intervals.

7. The vasoocclusion coil of claim 1 further comprising a second plug of thermoplastic biocompatible polymer comprised of a first portion that extends into the lumen at said second end of the coil and is molded into the windings defining said second end and a second rounded portion that extends axially outwardly from said lumen at said second end.

8. The vasoocclusion coil of claim 7 comprising a strand of a biocompatible polymer having a first end connected to said first plug, a second end connected to said second plug, and a segment intermediate said first and second ends of the strand that extends axially along the coil in a generally serpentine configuration composed of loops that extend through the coil windings at spaced intervals.

9. An assembly for use in occluding a vessel or vascular cavity comprising:

(a) a wire having a distal end;

(b) the vasoocclusion coil of claim 1 wherein the distal end of the wire is detachably coupled to the second end of the coil.

10. The assembly of claim 9 wherein the distal end of the wire is coupled to the second end of the coil by a mechanically detachable joint.

11. The assembly of claim 9 wherein the distal end of the wire is coupled to the second end of the coil by a metal joint that is susceptible to electrolysis.