Strut flow diverter for cerebral aneurysms and methods for preventing strut entanglement

Patent metadata

Field	Value
Publication number	US-2020281602-A1
Application number	US-201916294027-A
Country	US
Kind code	A1
Filing date	Mar 6, 2019
Priority date	Mar 6, 2019
Publication date	Sep 10, 2020
Grant date	—

Abstract

Implants described herein can be used as flow diverters and can generally include a plurality of twisting struts extending from a central node. The twisting struts can be twisted along a long axis of each strut. The implant can have a proximal portion affixed to the central node and extending radially from the central node. The twisting struts can have a distal portion. The long axis can be disposed between the proximal portion and the distal portion of the twisting struts. The implant can have a collapsed configuration to be delivered through a catheter into an aneurysm. The implant can have an expanded configuration to anchor within the aneurysm.

First claim

1 . A device for treating a cerebral aneurysm comprising:
a central node; and a plurality of twisting struts extending from the central node, wherein each twisting strut of the plurality of twisting struts comprises:
a proximal portion affixed to the central node and extending radially from the central node;
a distal portion;
a long axis disposed between the proximal portion and the distal portion;
an interior surface;
an exterior surface; and
an exterior spine,
wherein each of the twisting struts is twisted along the long axis, wherein the device comprises a collapsed configuration to be delivered through a catheter to the aneurysm, and wherein the device comprises an expanded configuration to anchor within the aneurysm.

2 . The device of claim 1 , wherein the central node comprises a horizontal axis; and the proximal portion is affixed at an angle to the horizontal axis.

3 . The device of claim 1 , wherein the central node comprises a vertical axis;
wherein in the collapsed configuration the twisting struts are twisted about the vertical axis, and wherein in the expanded configuration the twisting struts are aligned and non-interleaved.

4 . The device of claim 1 , wherein the interior surface of the distal portion of at least a portion of the plurality of twisting struts contacts the exterior surface of the distal portion of an adjacent twisting strut.

5 . The device of claim 2 , wherein the central node comprises a plurality of angled steps, wherein each angled step of the plurality of angled steps is affixed to one twisting strut of the plurality of twisting struts.

6 . The device of claim 2 , wherein the central node is cylindrical, and wherein the proximal portion of each twisting strut of the plurality of twisting struts extends radially from the cylindrical central node.

7 . The device of claim 1 , wherein the plurality of twisting struts are expandable to extend into an aneurysm sac, and wherein the exterior spine of each twisting strut of the plurality of twisting struts are positioned to engage an aneurysm wall.

8 . The device of claim 1 further comprising:
a proximal stabilizing frame affixed to the central node, extending radially from the central node, and engaging a first blood vessel wall.

9 . The device of claim 8 , wherein the proximal stabilizing frame engages the first blood vessel wall in a first blood vessel branch, and engages a second blood vessel wall in a second blood vessel branch.

10 . The device of claim 9 , wherein the proximal stabilizing frame comprises a first frame arm and a second frame arm, the first frame arm engaging the first blood vessel wall, and the second frame arm engaging the second blood vessel wall.

11 . A method for treating an aneurysm, the method comprising the steps of:
providing a flow diverter comprising:
a central node comprising a vertical axis; and
a plurality of twisting struts extending from the central node, wherein each twisting strut of the plurality of twisting struts comprises:
a proximal portion affixed to the central node and extending radially from the central node,
a distal portion,
a long axis disposed between the proximal portion and the distal portion,
an interior surface,
an exterior surface, and
an exterior spine,

twisting each of the twisting struts along the long axis, and twisting each of the twisting struts about the vertical axis; delivering the flow diverter to an aneurysm treatment site; inserting the distal portion of the plurality of twisting struts into an aneurysm sac of an aneurysm; expanding the plurality of twisting struts to engage an aneurysm wall from within the aneurysm sac, wherein the step comprises:
untwisting the twisting struts from their position about the vertical axis, and
engaging the aneurysm wall at the exterior spine of the plurality of twisting struts; and
blocking an aneurysm neck with the flow diverter to divert a blood flow from the aneurysm to a blood vessel adjacent the aneurysm.

12 . The method of claim 11 , wherein the flow diverter further comprises:
a proximal stabilizing frame affixed to the central node and extending radially from the central node;
the method further comprising the step of expanding the proximal stabilizing frame to engage a blood vessel wall.

13 . The method of claim 12 ,
wherein the proximal stabilizing frame comprises a first frame arm and a second frame arm, and wherein the step of expanding the proximal stabilizing frame to engage a blood vessel wall comprises:
engaging the first frame arm to a first blood vessel wall approximate the aneurysm neck in a first blood vessel branch; and
engaging the second frame arm to a second blood vessel wall approximate the aneurysm neck in a second blood vessel branch.

14 . A method for loading a flow diverter into a catheter, the method comprising the steps of:
providing a flow diverter comprising:
a central node comprising a vertical axis, and
a plurality of twisting struts extending from the central node, wherein each twisting strut of the plurality of twisting struts comprises:
a proximal portion,
a distal portion,
a long axis disposed between the proximal portion and the distal portion,
an interior surface,
an exterior surface, and
an exterior spine,

twisting each of the twisting struts along the long axis, and setting a first predetermined distance from the distal portion of each twisting strut of the plurality of twisting struts to an adjacent twisting strut; positioning the proximal portion of the flow diverter within a catheter; inserting the proximal portion of the flow diverter into the catheter; moving the distal portion of each twisting strut of the plurality of twisting struts from the first predetermined distance from the adjacent twisting strut to a second predetermined distance from the adjacent twisting strut, wherein the second predetermined distance is less than the first predetermined distance; and interleaving the plurality of twisting struts, wherein interleaving the plurality of twisting struts comprises:
twisting the twisting struts about the vertical axis; and
positioning the interior surface of the distal portion of each twisting strut of the plurality of twisting struts upon the exterior surface of an adjacent twisting strut.

15 . The method of claim 14 , wherein the flow diverter further comprises:
a proximal stabilizing frame affixed to the central node and extending radially from the central node;
the method further comprising the step of collapsing the proximal stabilizing frame to fit within the catheter.

Assignees

• Depuy Synthes Products Inc

Inventors

• Walsh Michael

Classifications

• A61B17/12145 Primary

  having a pre-set deployed three-dimensional shape (methods of manufacturing A61B2017/00526) · CPC title

• A61B17/12113 Primary

  within an aneurysm · CPC title

• A61B17/1214

  Coils or wires · CPC title

• A61B2017/1205

  Introduction devices · CPC title

• A61B17/12031

  complete occlusion · CPC title