Telescoping bifurcated stent

• US 8,435,284 B2
• Filed: 12/14/2005
• Issued: 05/07/2013
• Est. Priority Date: 12/14/2005
• Status: Expired due to Fees

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Inventors: Eidenschink, Tracee, Meyer, Michael P., Heidner, Matt, Gregorich, Daniel
• Primary Examiner(s): Erezo, Darwin
• Assistant Examiner(s): OU, JING RUI
• Application Number:
  US11/300,210
• Publication Number:
  US 20070135904A1
• Time in Patent Office: 2,701 Days
• Field of Search: 623/1.15, 623/1.16, 623/1.18, 623/1.19, 623/1.2, 623/1.35, 606/108
• US Class Current: 623/1.35
• CPC Class Codes: A61F 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• CPC Class Codes: A61F 2/856 Single tubular stent with a side portal passage
• CPC Class Codes: A61F 2/86 Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
• 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 2/92 Stents in the form of a rolled-up sheet expanding after insertion into the vessel , e.g. with a spiral shape in cross-section
• CPC Class Codes: A61F 2/93 circumferentially expandable by using ratcheting locks
• CPC Class Codes: A61F 2/954 for placing stents or stent-grafts in a bifurcation
• CPC Class Codes: A61F 2002/826 more than one stent being applied sequentially
• CPC Class Codes: A61F 2250/0007 for adjusting length
• CPC Class Codes: A61F 2250/001 for adjusting a diameter
• CPC Class Codes: A61F 2250/006 modular
• CPC Class Codes: A61F 2250/0065 telescopic

Abstract

A bifurcated stent that uses telescoping rings to support or form the side branch lumen. This design allows the bifurcation branch to extend easily, to a useful distance, and to be deployed along oblique angles. Best of all, this design avoids the need to deploy a bent stent.

Claims

1. A bifurcated stent being expandable from an unexpanded state to an expanded state, wherein in the unexpanded state the stent has a diameter less than that of the diameter in the expanded state, the bifurcated stent comprising:

a substantially tubular primary body defining a primary circumferential plane, a primary outer surface, a primary lumen and having a primary longitudinal axis extending therethrough;

a side branch assembly engaged to the primary body, the side branch assembly comprising a plurality of ring members, adjacent ring members being engaged one to the other by at least one connector, in the unexpanded state the plurality of ring members being positioned substantially within the primary circumferential plane, in the expanded state the plurality of ring members being positioned external to the primary circumferential plane and defining a secondary lumen, and having a secondary longitudinal axis extending therethrough, the secondary lumen being in fluid communication with the primary lumen, the secondary longitudinal axis forming an angle with the primary longitudinal axis,

wherein the plurality of ring members are generally circular, and

wherein the ring members have an unexpanded circumference in the unexpanded state and at least two of the plurality of ring members have substantially the same unexpanded circumference.

2. The stent of claim 1 wherein the ring members have an expanded circumference in the expanded state, wherein the expanded circumference is greater than the unexpanded circumference.

3. The stent of claim 2 wherein the ring members are constructed and arranged to self expand from the unexpanded circumference to the expanded circumference.

4. The stent of claim 2 wherein the ring members are engaged to the primary body by at least one engagement region, the at least one engagement region having an engaged state and a released state, in the engaged state the at least one ring member being retained in the unexpanded state and in the released state the at least one ring member being released to expand to the expanded state.

5. The stent of claim 1 wherein the at least one connector has a first end, a second end and a length therebetween, each end being flexibly engaged to one of the rings.

6. The stent of claim 1 wherein the at least one of the expanded state and the unexpanded state of at least two ring members have differing circumferences.

7. The stent of claim 1 wherein the secondary lumen comprises a length and a diameter, the diameter tapering along at least a portion of the length.

8. A bifurcated stent being expandable from an unexpanded state to an expanded state, wherein in the unexpanded state the stent has a diameter less than that of the diameter in the expanded state, the bifurcated stent comprising:

a substantially tubular primary body defining a primary circumferential plane, a primary outer surface, a primary lumen and having a primary longitudinal axis extending therethrough;

a side branch assembly engaged to the primary body, the side branch assembly comprising a plurality of ring members, adjacent ring members being engaged one to the other by at least one connector, in the unexpanded state the plurality of ring members being positioned substantially within the primary circumferential plane, in the expanded state the plurality of ring members being positioned external to the primary circumferential plane and defining a secondary lumen, and having a secondary longitudinal axis extending therethrough, the secondary lumen being in fluid communication with the primary lumen, the secondary longitudinal axis forming an angle with the primary longitudinal axis,

wherein the ring members have an unexpanded circumference in the unexpanded state and at least two of the plurality of ring members have substantially the same unexpanded circumference.

9. The stent of claim 8, wherein the connectors are substantially straight in both the unexpanded state and the expanded state.

10. The stent of claim 8, wherein the at least one of the expanded state and the unexpanded state of at least two ring members have differing circumferences.

11. The stent of claim 8, wherein in the unexpanded state the plurality of ring members are concentrically arranged relative to one another.