Circumferentially nested expandable device

• US 8,172,894 B2
• Filed: 04/26/2010
• Issued: 05/08/2012
• Est. Priority Date: 01/26/2007
• Status: Active Grant

• Current Assignee: REVA Medical Inc.
• Original Assignee: REVA Medical Inc.
• Inventors: Schmid, Eric, Morris, Andrew, Padilla, Orlanda
• Primary Examiner(s): Sweet, Thomas J
• Assistant Examiner(s): Stewart, Jason-Dennis
• Application Number:
  US12/767,748
• Publication Number:
  US 20100211159A1
• Time in Patent Office: 743 Days
• Field of Search: 623/1.15, 623/1.16
• US Class Current: 623/1.15
• CPC Class Codes: A61F 2/844 folded prior to deployment
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/91591 Locking connectors, e.g. using male-female connections
• CPC Class Codes: A61F 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61F 2250/0007 for adjusting length
• CPC Class Codes: B33Y 80/00 Products made by additive manufacturing

Abstract

Expandable medical implants for maintaining support of a body lumen are disclosed. These implants comprise a circumferentially nested, diametrically expandable, moveable vascular device for enlarging an occluded portion of a vessel. The device can be configured to allow for motion such as rotating, translating, and/or slide and lock. One advantage of the circumferentially nested stent is that it maintains the expanded size, without significant recoil.

Claims

1. A stent being expandable from a collapsed state to an expanded state, the stent comprising a tubular member having longitudinal and circumferential axes, the tubular member comprising at least one linkage section comprising:

first and second structural elements each having first and second ends, the first end of the first structural element being positioned adjacent to the first end of the second structural element, the structural elements being disposed along the circumferential axis of the tubular member, the first structural element comprising an engagement section; and

an articulating member having first and second ends, the first end of the articulating member being connected to the second structural element with the articulating member extending therefrom toward the engagement section of the first structural element, the articulating member creating a toothed engagement with the engagement section for providing one-way movement of the articulating member relative to the engagement section upon angular movement of the first structural element relative to the second structural element;

wherein the first structural element and the second structural element are in a collapsed configuration when the stent is in the unexpanded state, the first structural element and the second structural element moving toward an expanded configuration upon movement of the first structural element with respect to the second structural element thereby expanding the stent to the expanded state, the one-way movement of the articulating member relative to the engagement section maintaining a given spacing between the first and second structural elements in order to prevent collapse of the stent to the collapsed state upon being expanded to the expanded state.

2. The stent of claim 1, wherein the linkage section includes a plurality of pairs of structural elements, each pair of structural elements including an articulating member.

3. The stent of claim 1, wherein the structural elements are connected at the first ends thereof at a coupling point.

4. The stent of claim 3, wherein the articulating member is connected to the second structural element adjacent the coupling point.

5. The stent of claim 3, wherein the first and second structural elements are rotatably connected.

6. The stent of claim 5, wherein the first structural element and the second structural element move toward an expanded configuration upon angular rotation of the first structural element with respect to the second structural element thereby expanding the stent to the expanded state.

7. The stent of claim 1, wherein the first structural element comprises an engagement section disposed through a portion of the first end thereof.

8. The stent of claim 1, wherein the articulating member comprises a plurality of teeth disposed therealong.

9. The stent of claim 8, wherein the teeth are sized and configured to engage the engagement section.

10. The stent of claim 1, wherein the articulating member engages the engagement section for providing one-way translational withdrawal of the articulating member from the engagement section upon angular separation of the first structural element from the second structural element.

11. The stent of claim 1, wherein the first structural element is positionable substantially circumferentially adjacent to the second structural element when the stent is in the unexpanded state, the first structural element being separable from the second structural element upon angular rotation of the first structural element with respect to the second structural element thereby expanding the stent to the expanded state.

12. The stent of claim 1, wherein the articulating member is monolithically formed with the second structural element.