Stent with protruding branch portion for bifurcated vessels

• US 7,220,275 B2
• Filed: 08/21/2003
• Issued: 05/22/2007
• Est. Priority Date: 11/04/1996
• Status: Expired due to Fees

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Advanced Stent Technologies Inc. (Boston Scientific Corporation)
• Inventors: Konstantino, Eitan, Williams, Eric, Vardi, Gil M., Davidson, Charles J., Yadin, Amnon, Morik, Yossi, Feld, Tanhum
• Primary Examiner(s): Isabella; David J.
• Application Number:
  US10/644,550
• Publication Number:
  US 20040138737A1
• Time in Patent Office: 1,370 Days
• Field of Search: 623/1.35, 623/1.22, 623/1.17, 623/1.1, 623/1.12, 623/1.13, 623/1.15, 623/1.18, 606190-195, 606/198, 606/200
• US Class Current: 623/1.35
• CPC Class Codes: A61F 2/064 with special features to facilitate anastomotic coupling anastomosis of natural blood vessels A61B17/11
• CPC Class Codes: A61F 2/07 Stent-grafts
• 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 2/91 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 2/954 for placing stents or stent-grafts in a bifurcation
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/821 Ostial stents
• CPC Class Codes: A61F 2002/91508 the meander having a difference in amplitude along the band
• CPC Class Codes: A61F 2002/91516 the meander having a change in frequency along the band
• CPC Class Codes: A61F 2002/91525 within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/91583 by a bridge, whereby at least one of its ends is connected along the length of a strut between two consecutive apices within a band
• CPC Class Codes: A61F 2250/0018 differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2250/0039 differing in diameter
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers
• CPC Class Codes: A61M 2025/1045 for treating bifurcations, e.g. balloons in y-configuration, separate balloons or special features of the catheter for treating bifurcations
• CPC Class Codes: A61M 25/1002 characterised by balloon shape A61M25/1006, A61M25/1009 take precedence

Abstract

The present invention is directed to a stent for use in a bifurcated body lumen having a main branch and a side branch. The stent comprises a radially expandable generally tubular stent body having proximal and distal opposing ends with a body wall having a surface extending therebetween. The surface has a geometrical configuration defining a first pattern, and the first pattern has first pattern struts and connectors arranged in a predetermined configuration. The stent also comprises a branch portion comprised of a second pattern, wherein the branch portion is at least partially detachable from the stent body.

Claims

1. A stent for implantation in a bifurcated body lumen having a main branch and a side branch, wherein the stent comprises:

a tubular body having an opening with a proximal side and a distal side and a distal end and a proximal end, the tubular body comprises a first pattern of rows of struts and connectors, the rows of struts are connected to each other by said connectors;

a branch portion positioned adjacent to the opening between said distal end and said proximal end of said tubular body,

wherein in a first configuration said branch portion is flush with said tubular body and in a second configuration said branch portion is extended outward with respect to the tubular body and in which the branch portion extends away from both the proximal side and the distal side of the opening.

2. The stent of claim 1, wherein said branch portion comprises a second pattern of rows of struts and connectors, wherein said second pattern of rows of struts and connectors has a different configuration than said first pattern of rows of struts and connectors.

3. The stent of claim 2, wherein said different configuration includes different strut lengths.

4. The stent of claim 2, wherein said different configuration includes at least one row having a different strut density.

5. The stent of claim 1 in which:

the branch portion further comprises a first ring connected by a first ring connector to the tubular body and a second ring connected by second ring connector to the first ring, when in the first configuration the first ring is concentric with the second ring, and when in the first configuration the first and second rings define ring patterns each of which is a complete circuit extending from a first side of the first or second ring connector respectively to the second side of the same respective ring connector,

when in the first configuration the first and second rings are flush with the tubular body and when in the second configuration the first and second rings extend outwardly from the tubular body.

6. The stent according to claim 5, wherein the tubular body has a longitudinal axis and the branch portion is disposed substantially perpendicular to the longitudinal axis in the second configuration.

7. The stent according to claim 5, wherein the branch portion includes a support ring.

8. The stent according to claim 7, wherein the support ring is a continuous loop.