Stent with protruding branch portion for bifurcated vessels

• US 20040267352A1
• Filed: 03/17/2004
• Published: 12/30/2004
• Est. Priority Date: 01/13/1999
• Status: Active Grant

• 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., Feld, Tanhum, Yadin, Amnon, Morik, Yossi
• Granted Patent: US 7,341,598 B2
• Time in Patent Office: Days
• US Class Current: 623/1.15
• 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 2002/067 modular
• 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 2002/91566 connected trough to trough
• 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: 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 bifurcation stent, comprising:

a tubular member having an inner diameter and an outer diameter defining a wall therebetween, the wall having a geometrical configuration defining a pattern; and

an expandable branch structure formed in the wall of the tubular structure and interrupting the wall pattern, the expandable branch structure having a first ring connected to the tubular member and a second ring connected to the first ring, the first ring being concentric with the second ring,

wherein the second ring substantially surrounds and defines a central branch opening,

wherein the first ring and the second ring are movable from an unexpanded configuration to an expanded configuration, in the unexpanded configuration the first and second rings are disposed along the wall and in the expanded configuration the first and second rings extend outwardly from the tubular member, and

wherein an auxiliary access opening is defined between the first and second rings to provide access to a branch vessel in the unexpanded condition, the auxiliary access opening being larger than the central branch opening in the unexpanded configuration.

2. The stent according to claim 1, wherein the tubular member has a longitudinal axis and the expandable branch structure is disposed substantially perpendicular to the longitudinal axis in the expanded configuration.

3. The stent according to claim 1, wherein the tubular member comprises a plurality of undulating rings disposed along the longitudinal axis and the undulating rings are connected by connectors.

4. The stent according to claim 1, wherein the first and second rings have a common axis disposed substantially perpendicular to the longitudinal axis in the unexpanded configuration.

5. The stent according to claim 1, wherein the branch structure includes a transition ring.

6. The stent according to claim 5, wherein the transition ring comprises a discontinuous portion.

7. The stent according to claim 5, wherein at least one omega shaped connecting member extends between the transition ring and the wall pattern.

8. The stent according to claim 6, wherein at least one connecting member extends through the discontinuous portion and connects the first ring to a portion of the wall pattern outside the extendible branch structure.

9. The stent according to claim 8, wherein the at least one connecting member connects the first ring to an omega shaped strut portion of the wall pattern outside the extendible branch structure.

10. The stent according to claim 5, wherein the second ring is connected to the first ring by a plurality of inner connectors.

11. The stent according to claim 10, wherein the first ring is connected to the transition ring by a plurality of outer connectors.

12. The stent according to claim 11, wherein at least one of the outer connectors is a generally undulating curvilinear member extending toward the center of the branch opening.

13. The stent according to claim 11, wherein the inner and outer connectors are generally straight members and extend toward the center of the branch opening.

14. The stent according to claim 13, wherein the first and second rings are generally continuous undulating curvilinear members and include undulation peaks extending toward the central branch opening.

15. The stent according to claim 11, wherein the intersection of each outer connector with the transition ring forms a pivot point about which an undulation peak may pivot outward in the expanded configuration.

16. The stent according to claim 1, wherein the first and second rings are generally continuous curvilinear members and include undulation peaks, wherein the undulation peaks of the second ring have a radius of curvature of about 0.025 mm to about 0.225 mm.

17. The stent according to claim 15, wherein the undulation peaks of the second ring have a radius of curvature of about 0.125 mm to about 0.225 mm.

18. A bifurcation stent, comprising:

a tubular member having an inner diameter and an outer diameter defining a wall therebetween, the wall having a geometrical configuration defining a pattern; and

an expandable branch structure formed in the wall of the tubular structure and interrupting the wall pattern, the expandable branch structure having a first ring connected to the tubular member and a second ring connected to the first ring, the first ring being concentric with the second ring,

wherein the second ring substantially surrounds and defines a central branch opening,

wherein the first ring and the second ring are movable from an unexpanded configuration to an expanded configuration, in the unexpanded configuration the first and second rings are disposed along the wall and in the expanded configuration the first and second rings extend outwardly from the tubular member, and

wherein the first and second rings are generally continuous curvilinear members and include undulation peaks, wherein the undulation peaks of the second ring have a radius of curvature of about 0.025 mm to about 0.225 mm.

19. The stent according to claim 18, wherein the undulation peaks of the second ring have a radius of curvature of about 0.125 mm to about 0.225 mm.

20. A bifurcation stent, comprising:

a tubular member having an inner diameter and an outer diameter defining a wall therebetween, the wall having a geometrical configuration defining a pattern; and

an expandable branch structure formed in the wall of the tubular structure and interrupting the wall pattern, the expandable branch structure having a first ring connected to the tubular member and a second ring connected to the first ring, the first ring being concentric with the second ring,

wherein the second ring substantially surrounds and defines a central branch opening,

wherein the first ring and the second ring are movable from an unexpanded configuration to an expanded configuration, in the unexpanded configuration the first and second rings are disposed along the wall and in the expanded configuration the first and second rings extend outwardly from the tubular member,

wherein the branch structure includes a transition ring,

wherein the second ring is connected to the first ring by a plurality of inner connectors and the first ring is connected to the transition ring by a plurality of outer connectors, and

wherein at least one of the outer connectors is a generally undulating curvilinear member extending toward the center of the branch opening.