TWISTED PRIMARY COIL FOR VASCULAR THERAPY

• US 20090069836A1
• Filed: 08/18/2008
• Published: 03/12/2009
• Est. Priority Date: 08/17/2007
• Status: Active Grant

• Current Assignee: DePuy Synthes Products LLC (Johnson & Johnson)
• Original Assignee: Micrus Endovascular LLC (Johnson & Johnson)
• Inventors: Badesha, Jasbir, Labdag, Fatima-Ezzahra
• Granted Patent: US 8,870,908 B2
• Time in Patent Office: Days
• 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 17/12154 having stretch limiting means
• CPC Class Codes: A61B 2017/00526 Methods of manufacturing

Abstract

A flexible metal wire coil is formed with a twisted coil pattern, by forming a primary coil on a special mandrel formed from two or more strands of material twisted helically about a longitudinal axis to have a helical shape. The primary coil wire is wound around the mandrel to give the primary coil a twisted shape corresponding to the helical shape of the mandrel.

Claims

1. A primary wind coil having a longitudinal axis, comprising:

a flexible metal wire coiled about the longitudinal axis of the primary wind coil, said primary wind coil being elongated along said longitudinal axis and having a non-circular cross-sectional shape, an axis of said non-circular cross-sectional shape precessing along said longitudinal axis to form a repeating twisted coil pattern.

2. The primary wind coil of claim 1, wherein said single flexible metal wire coil has the external shape of a double helix.

3. The primary wind coil of claim 1, wherein said non-circular cross-sectional shape is selected from the group consisting of oval, oblong and generally triangular with rounded cornered shapes.

4. The primary wind coil of claim 1, wherein said non-circular cross-sectional shape is elongated along at least one transverse axis that is at an angle to said longitudinal axis, and wherein said at least one transverse axis precesses along said longitudinal axis.

5. The primary wind coil of claim 4, wherein said non-circular cross-sectional shape is elongated along one transverse axis that is transverse to said longitudinal axis.

6. The primary wind coil of claim 4, wherein said non-circular cross-sectional shape is elongated along a first transverse axis of lower bending resistance and a second transverse axis of higher bending resistance that are at an angle to said longitudinal axis.

7. The primary wind coil of claim 1, wherein said flexible metal coiled wire is formed to have a secondary shape selected from the group consisting of cylindrical, conical, spherical and spheroidal shapes and combinations thereof.

8. The primary wind coil of claim 1, wherein said primary wind coil has an interior space along a longitudinal axis of the primary wind coil, and further comprising an axial strand of material extending through the interior space along the longitudinal axis of the primary wind coil.

9. The primary wind coil of claim 1, wherein said primary wind coil has a variable bending moment in different planes of the primary wind coil, such that the plane of minimum bending force varies along the length of the primary wind coil.

10. A secondary wind coil, comprising:

a primary wind coil having a longitudinal axis, said primary wind coil being formed from a flexible metal wire coiled about the longitudinal axis of the primary wind coil, said primary wind coil being elongated along said longitudinal axis and having a non-circular cross-sectional shape, said non-circular cross-sectional shape precessing along said longitudinal axis to form a repeating twisted coil pattern; and

said primary wind coil being formed to have a secondary shape selected from the group consisting of cylindrical, conical, spherical and spheroidal shapes and combinations thereof.

11. The secondary wind coil of claim 10, wherein said single flexible metal coiled wire has the external shape of a double helix.

12. The secondary wind coil of claim 10, wherein said non-circular cross-sectional shape is selected from the group consisting of oval, oblong and generally triangular with rounded cornered shapes.

13. The secondary wind coil of claim 10, wherein said non-circular cross-sectional shape is elongated along at least one transverse axis that is transverse to said longitudinal axis, and wherein said at least one transverse axis precesses along said longitudinal axis.

14. The secondary wind coil of claim 13, wherein said non-circular cross-sectional shape is elongated along one transverse axis that lies at an angle to said longitudinal axis.

15. The secondary wind coil of claim 13, wherein said non-circular cross-sectional shape is elongated along a first transverse axis and a second transverse axis that lie at an angle to said longitudinal axis.

16. The secondary wind coil of claim 10, wherein said primary wind coil has an interior space along a longitudinal axis of the primary wind coil, and further comprising an axial strand of material extending through the interior space along the longitudinal axis of the primary wind coil.

17. The secondary wind coil of claim 10, wherein said primary wind coil has a variable bending moment in different planes of the primary wind coil, such that the plane of minimum bending force varies along the length of the primary wind coil.

18. A method of forming a flexible metal wire coil having a twisted coil pattern, comprising:

providing a mandrel having an external surface with a non-circular cross section, the axis of said non-circular cross section progressing along the mandrel in a pre-determined longitudinally twisting pattern; and

;

winding a flexible coil wire around a length of the mandrel to form a primary wind coil having a twisted shape corresponding to the shape of the external surface of the mandrel.

19. The method of claim 18, further comprising the step of forming said primary wind coil to have a secondary shape selected from the group consisting of cylindrical, conical, spherical and spheroidal shapes.

20. The method of claim 18, wherein said primary wind coil has an interior space along a longitudinal axis of the primary wind coil, and further comprising the step of inserting an strand of material into the interior space of the primary wind along the longitudinal axis of the primary wind coil.