Micro-Spiral Implantation Device

• US 20080103585A1
• Filed: 09/22/2004
• Published: 05/01/2008
• Est. Priority Date: 09/22/2004
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Dendron GmbH (Medtronic Plc)
• Inventors: Flesser, Achim, Hannes, Ralf, Monstadt, Hermann
• Granted Patent: US 8,845,676 B2
• Time in Patent Office: Days
• US Class Current: 623/1.22
• 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 17/1215 comprising additional materials, e.g. thrombogenic, having filaments, having fibers, being coated
• CPC Class Codes: A61B 2017/12063 electrolytically detachable

Abstract

The invention relates to a device for the implantation of microcoils (3, 7, 11, 12) into body cavities and blood vessels, in particular aneurysms, with said microcoils (3, 7, 11, 12) comprising wires forming a plurality of windings (4), at least one microcoil serving as occlusion helix (3) for the occlusion of the body cavity or blood vessel, and the device consisting of a catheter, one or several microcoils (3, 7, 11, 12) movably arranged in longitudinal direction within the catheter and at least one securing means (10) passing at least partially through the lumen (9) of the occlusion helix (3), with said securing means (10) being fixed in its end areas inside the microcoils (3, 7, 11, 12). Such a fixation of the securing means (10) is achieved in at least one end area by providing a frictional connection with the microcoil (3, 7, 11, 12) in such a manner that this connection is detachable from the microcoil (3, 7, 11, 12) when a certain tensile force acting on the securing means (10) is exceeded. In this way, a sudden breakage of the securing means (10) is avoided if too high a pull force is applied so that forces otherwise liberated cannot destroy the occlusion helix (3) or cause other damage in the blood vessel.

Claims

1. A device for the implantation of microcoils into body cavities and blood vessels, in particular aneurysms, said microcoils comprising wires forming a plurality of windings, one microcoil serving as an occlusion helix for occlusion of the body cavity or blood vessel, the device comprising:

a catheter;

a first microcoil movably arranged within the catheter in a longitudinal direction;

securing means passing at least partially through a lumen of the occlusion helix, said securing means being fixed at end areas thereof inside the first microcoil

wherein the securing means in order to achieve a frictional connection is fixed in the first microcoil at least in one end area in such a manner that the frictional connection is detachable from the first microcoil when a certain tensile force acting on the securing means is exceeded.

2. The device according to claim 1, characterized in that the securing means is clamped in at least one end area between windings of the first microcoil.

3. The device according to claim 1, characterized in that the securing means passes in one end area in at least one turn around the wire forming windings of the first microcoil.

4. The device according to claim 1, characterized in that a second microcoil is placed in the first microcoil serving as the occlusion helix, with an outside diameter of the first microcoil corresponding to an inside diameter of the occlusion helix, and the securing means is clamped in at least one end area between windings of the second microcoil and the windings of the occlusion helix.

5. The device according to claim 1, characterized in that a thickening element is placed in the first microcoil serving as the occlusion helix, an outside diameter of said thickening element corresponding to an inside diameter of the occlusion helix, and the securing means is clamped in at least one end area between windings of the occlusion helix and the thickening element.

6. The device according to claim 1 characterized in that the securing means is fixed in two end areas in the first microcoil by means of a frictional connection.

7. The device according to claim 1 characterized in that the securing means is frictionally connected at a distal end area and at a proximal end area to a microcoil.

8. The device according to claim 1 characterized in that the securing means is permanently connected at a proximal end area and frictionally connected at a distal end area to a microcoil.

9. The device according to claim 8, characterized in that the securing means is attached at the distal end to a thickening element arranged distally of a microcoil with said element preventing passage through the microcoil.

10. The device according to claim 1 characterized in that the securing means is one of a polymer thread and polymer thread bundle.

11. The device according to claim 10, characterized in that the polymer thread has a thrombogeneous effect.

12. The device according to claim 11, characterized in that the polymer thread comprises a polyamide.

13. The device according to claim 10 characterized in that one of the securing means and the occlusion helix is provided with a collagen coating.

14. The device according to claim 10 characterized in that the polymer thread projects outwardly from the occlusion helix.

15. The device according to claim 14, characterized in that the polymer thread projects outwardly from and produces loops on the occlusion helix locations between proximal and distal ends of the occlusion helix.

16. The device according to claim 15, characterized in that adjacent to the loops the polymer thread is wrapped around individual windings of the occlusion helix.

17. The device according to claim 16, characterized in that selected polymer threads are wrapped around the securing means with ends of said threads projecting outwardly from the occlusion helix.

18. The device according to claim 17, characterized in that the securing means is provided with an adhesive coating causing selected polymer threads to be bonded to the securing means with ends of said threads projecting outwardly from the occlusion helix.

19. The device according to claim 18, characterized in that selected polymer threads are fused onto the securing means with the ends of said threads projecting outwardly from the occlusion helix.

20. The device according to claim 19, characterized in that the polymer thread consists of individual fibers.

21. The device according to claim 20, characterized in that some fibers (14) of the polymer thread project outwardly from the occlusion helix whereas other fibers of the polymer thread pass through the lumen of the occlusion helix along the entire length.

22. The device according to claim 20, characterized in that individual fibers of the polymer thread are shorter than the polymer the thread in its entirety and wherein the individual fiber ends project outwardly from the occlusion helix.

23. The device according to claim 1 wherein individual fibers are glued to or fused onto the securing means and project outwardly from the occlusion helix.

24. The device according to claim 1 wherein the occlusion helix has plural locations that are electrolytically corrodible, and wherein in segments of the occlusion helix a securing means is arranged between said locations.

25. An occlusion helix for implantation into body cavities and blood vessels with a catheter, the occlusion helix comprising:

a first microcoil movably arranged within the catheter in a longitudinal direction, said first microcoil comprising wires forming a plurality of windings serving as the occlusion helix;

a securing mechanism passing at least partially through a lumen of the occlusion helix, said securing means being fixed at end areas thereof inside the first microcoil

wherein the securing means in order to achieve a frictional connection is fixed in the first microcoil at least in one end area in such a manner that the frictional connection is detachable from the first microcoil when a certain tensile force acting on the securing means is exceeded.