Durable stent graft with tapered struts and stable delivery methods and devices

• US 8,992,595 B2
• Filed: 03/13/2013
• Issued: 03/31/2015
• Est. Priority Date: 04/04/2012
• Status: Active Grant

• Current Assignee: Endologix, Trivascular Incorporated
• Original Assignee: Trivascular Incorporated
• Inventors: Staudenmayer, Christopher, Watson, James, Parsons, Dennis
• Primary Examiner(s): Manahan, Todd
• Assistant Examiner(s): Lutzow, III, Charles A
• Application Number:
  US13/799,207
• Publication Number:
  US 20130268044A1
• Time in Patent Office: 748 Days
• Field of Search: 623/1.13, 623/1.14, 623/1.15, 623/1.16, 623/1.17, 623/1.18, 623/1.19, 623/1.2, 623/1.21, 623/1.31, 623/5, 606/159
• US Class Current: 623/1.13
• 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 2/848 having means for fixation to the vessel wall, e.g. barbs
• CPC Class Codes: A61F 2/88 the wire-like elements formed as helical or spiral coils forming a net-like or mesh-like structure A61F2/90
• CPC Class Codes: A61F 2/89 the wire-like elements comprising two or more adjacent rings flexibly connected by separate members
• CPC Class Codes: A61F 2/90 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 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2002/065 Y-shaped blood vessels
• CPC Class Codes: A61F 2002/067 modular
• CPC Class Codes: A61F 2002/072 Encapsulated stents, e.g. wire or whole stent embedded in lining
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2002/825 having longitudinal struts
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2220/0075 sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2230/0008 : elliptical or oval
• CPC Class Codes: A61F 2230/0013 : Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2230/0019 : rectangular
• CPC Class Codes: A61F 2230/0026 : trapezoidal
• CPC Class Codes: A61F 2230/0078 : hyperboloidal
• CPC Class Codes: A61F 2250/0003 : having an inflatable pocket filled with fluid, e.g. liquid or gas
• CPC Class Codes: A61F 2250/0036 : differing in thickness
• CPC Class Codes: Y10T 29/49863 : with prestressing of part

Abstract

Some embodiments relate in part to endovascular prostheses and methods of deploying same. Embodiments may be directed more specifically to stent grafts and methods of making and deploying same within the body of a patient. Stent embodiments may include tapered struts for an even distribution of strain. Stent embodiments may also include portions which are enlarged in a circumferential direction which may be configured to stabilize the stent in a constrained state.

Claims

1. An endovascular stent graft, comprising:

a main body portion including at least one tubular portion made from at least one layer of flexible material; and

a self-expanding proximal anchor member which includes;

a constrained state,

a relaxed expanded state,

a proximal stent portion,

a distal stent portion with a proximal end of the distal stent portion secured to a distal end of the proximal stent portion and a distal end of the distal stent portion secured to a proximal end of the main body portion, and wherein the axial length of the self-expanding anchor member as a whole divided by the axial length of the proximal stent portion is about 1.75 to about 2.5, and wherein an axial length of the self-expanding proximal anchor member as a whole divided by an axial length of a tapered strut from a proximal crown of the distal stent portion at a proximal end thereof to an axial position of minimum strut cross section between the proximal crown and a distal crown of the distal stent portion is a ratio of about 3.0 to about 4.5.

2. A self-expanding anchor member, comprising:

a constrained state,

a relaxed expanded state,

a proximal stent portion,

a distal stent portion with a proximal end of the distal stent portion secured to a distal end of the proximal stent portion, and wherein an axial length of the self-expanding anchor member as a whole divided by the axial length of the proximal stent portion is about 1.75 to about 2.5 and wherein an axial length of the self-expanding anchor member as a whole divided by an axial length of a tapered strut from a proximal crown of the distal stent portion at a proximal end thereof to an axial position of minimum strut cross section between the proximal crown and a distal crown of the distal stent portion is a ratio of about 3.0 to about 4.5.