Endovascular stent graft

• US 6,695,875 B2
• Filed: 03/14/2001
• Issued: 02/24/2004
• Est. Priority Date: 03/14/2000
• Status: Expired due to Term

• Current Assignee: Cook Medical Technologies, LLC (Cook Group Incorporated)
• Original Assignee: Cook Incorporated (Cook Group Incorporated), William A. Cook Australia Pty. Ltd (Cook Group Incorporated), William Cook Europe ApS (Cook Group Incorporated)
• Inventors: Lawrence-Brown, Michael, Hartley, David, Stelter, Wolf
• Primary Examiner(s): McDermott, Corrine
• Assistant Examiner(s): LANDREM, KAMRIN R
• Application Number:
  US09/808,251
• Publication Number:
  US 20010037142A1
• Time in Patent Office: 1,077 Days
• Field of Search: 623/1.11, 623/1.12, 623/1.13, 623/1.16, 623/1.23, 623/1.35
• US Class Current: 623/1.13
• CPC Class Codes: A61F 2/07 Stent-grafts
• 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 2002/067 modular
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2002/9511 the retaining means being filaments or wires
• CPC Class Codes: A61F 2220/0033 made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2230/0067 conical

Abstract

An endovascular stent graft assembly (10) for use with abdominal aorta aneurysms (70) and having a main stent graft body (12) and a separate attachment graft tube (14) that extends proximally therefrom having the proximal attachment stent (50) thereon for infrarenal attachment of the assembly (10) to the aorta (74). A distal end portion (44) of the attachment graft tube (14) underlies the proximal end portion (30) of the main stent graft body (12) and presses outwardly there against forming a a friction fit, at an overlapping region (64). The main stent graft body (12) has an ipsilateral leg (22) and a contralateral stump (24) at the bifurcation (26); and prior to deployment of the attachment graft tube (14), the main stent graft body is pulled against the vessel bifurcation (72). After deployment of the attachment graft tube (14), the contralateral leg (16) is deployed at the contralateral stump to complete the stent graft assembly (10). Preferably, an additional intragraft stent graft tube (18) is deployed to underlie and press outwardly and support the overlapping region (64) of the attachment graft tube and the main stent graft body.

Claims

1. An endovascular stent graft comprising:

a main stent graft body having at least one stent secured to an outer surface of graft material, the stent graft body having a main body section defining a lumen extending from a proximal end to a bifurcation, and further having an ipsilateral leg portion and a contralateral portion extending integrally from the main body section at the bifurcation to respective distal ends and defining respective lumens; and

an attachment graft tube having proximal and distal end portions and defining a lumen therethrough and further including an attachment stent extending from the proximal end portion and a self-expanding stent secured to an inner surface adjacent a distal end of the attachment graft tube,

wherein the attachment graft tube is securable to the main stent graft body at an overlapping region, the attachment graft tube distal end portion being securable to and within a proximal end portion of the main stent graft body at the overlapping region, upon deployment.

2. The stent graft of claim 1 wherein the attachment graft tube is securable to the main stent graft body by a friction fit generated by spring forces of the self-expanding stent within the attachment graft tube distal portion pressing radially outwardly against the expanded proximal end portion of the main stent graft body, upon deployment.

3. The stent graft of claim 1 further comprising an intragraft tube having proximal and distal end portions, wherein the intragraft tube is disposed to extend from within the lumen of the main stent graft body proximally into the lumen of the attachment graft tube, and the intragraft tube underlying, supporting and extending beyond the overlapping region, upon deployment.

4. The stent graft of claim 3 wherein the intragraft tube is securable to both the main stent graft body and the attachment graft tube by a friction fit generated by spring forces of a plurality of self-expanding stents, respective ones of which are within at least the intragraft tube distal and proximal portions, pressing radially outwardly against the expanded proximal end portion of the main stent graft body and the expanded distal end portion of the attachment graft tube, upon deployment.

5. The stent graft of claim 1 further comprising a contralateral leg extension for being secured to the distal end of the contralateral portion.

6. An endovascular stent graft comprising:

a main stent graft body having at least one stent secured to an outer surface of graft material, the stent graft body having a main body section defining a lumen extending from a proximal end to a bifurcation, and further having an ipsilateral leg portion and a contralateral portion extending integrally from the main body section at the bifurcation to respective distal ends and defining respective lumens;

a contralateral leg extension for being secured to the distal end of the contralateral portion;

an attachment graft tube having proximal and distal end portions and defining a lumen therethrough and further Including an attachment stent extending proximally from the proximal end portion, wherein the attachment graft tube is securable to the main stent graft body at an overlapping region, the attachment graft tube distal end portion being securable to and within a proximal end portion of the main stent graft body at the overlapping region by a friction fit generated by spring forces of a self-expanding stent within the attachment graft tube distal portion, secured to an inner surface of the attachment graft tube and pressing radially outwardly against the expanded proximal end portion of the main stent graft body upon deployment; and

an intragraft tube having proximal and distal end portions, wherein the intragraft tube is disposed within the lumen extending from the main body section of the main stent graft proximally into the lumen of the attachment graft tube, and the intragraft tube underlying, supporting and extending beyond the overlapping region, the intragraft tube being securable to both the main stent graft body and the attachment graft tube by a friction fit generated by spring forces of a plurality of self-expanding stents, respective ones of which are within at least the intragraft tube distal and proximal portions, pressing radially outwardly against the expanded proximal end portion of the main stent graft body and the expanded distal end portion of the attachment graft tube, upon deployment thereof.

7. A stent graft assembly to be located within a vessel of a patient, comprising a first stent graft member and at least one other stent graft member, the first stent graft member having at a proximal portion thereof a first attachment region for enabling the first member to be attached via at least one stent to a proximal part of the vessel, wherein a first self-expanding stent is secured to an inside surface adjacent a distal end of the first member, wherein the first member further comprises a second self-expanding scent secured to an outer surface of a distal portion thereof and proximal the first self-expanding scent, wherein the first member also comprises a second attachment region extending over the outer surface and serving to provide a region in which the other stent graft member can be attached to the first member, wherein the distal part of the first member is to extend significantly within at least a proximal portion of the other member;

and an additional graft tube to be attached to a section of the first member and designed to extend in a distal direction within the other member.