Helically supported graft

• US 6,264,684 B1
• Filed: 12/22/1997
• Issued: 07/24/2001
• Est. Priority Date: 03/10/1995
• Status: Expired due to Term

• Current Assignee: Bard Peripheral Vascular Incorporated (Becton, Dickinson & Co)
• Original Assignee: IMPRA Incorporated (Becton, Dickinson & Co)
• Inventors: Banas, Christopher E., McCrea, Brendan J., Edwin, Tarun J., Kowligi, Rajagopal R.
• Primary Examiner(s): Prebilic, Paul B.
• Application Number:
  US08/999,583
• Time in Patent Office: 1,310 Days
• Field of Search: 623/1, 623/12, 623/1.13, 623/1.27, 623/23.7, 623/23.71, 606/191, 606/194, 606/195, 606/198, 606/108
• US Class Current: 623/1.13
• CPC Class Codes: A61F 2/0077 Special surfaces of prostheses, e.g. for improving ingrowth A61F2/30767 takes precedence
• CPC Class Codes: A61F 2/06 Blood vessels
• 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 2/86 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 2/88 the wire-like elements formed as helical or spiral coils forming a net-like or mesh-like structure A61F2/90
• CPC Class Codes: A61F 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 2002/30092 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2002/30448 using adhesives
• CPC Class Codes: A61F 2210/0019 operated at only one temperature whilst inside or touching the human body, e.g. constrained in a non-operative shape during surgery, another temperature only occurring before the operation
• CPC Class Codes: A61F 2210/0076 multilayered, e.g. laminated structures
• CPC Class Codes: A61F 2220/005 using adhesives
• CPC Class Codes: A61L 31/048 obtained by reactions only involving carbon-to-carbon unsaturated bonds A61L31/041 takes precedence
• CPC Class Codes: C08L 27/18 Homopolymers or copolymers or tetrafluoroethene

Abstract

Shape memory alloy and elastically self-expanding endoluminal support structures which are at least partially encapsulated in a substantially monolithic expanded polytetrafluoroethylene (“ePTFE”) covering. An endoluminal stent, which has a reduced diametric dimension for endoluminal delivery and a larger in vivo final diametric diameter, is encapsulated in an ePTFE covering which circumferentially covers both the luminal and abluminal walls along at least a portion of the longitudinal extent of the endoluminal stent. The stent and ePTFE covering are helically wound into an open cylindrical configuration with adjacent windings forming overlapping regions of ePTFE covering bonded to one another. The shape memory endoluminal stent is fabricated from a shape memory alloy which exhibits either shape memory or pseudoelastic properties or from an elastic material having an inherent spring tension such as spring steel, braided stainless steel wire, or composite materials, such as woven or braided carbon fibers.

Claims

1. An endoluminal prosthesis comprising an elongate support wire member joined along its length to an elongate planar expanded polytetrafluoroethylene film member, the joined support wire member and planar expanded polytetrafluoroethylene film member being helically wound into an open cylindrical configuration with adjacent windings forming overlapping regions of the expanded polytetrafluoroethylene film member bonded to one another.

2. The endoluminal prosthesis according to claim 1, further comprising a planar polytetrafluoroethylene film member in intimate contact with and monolithically joined to the planar expanded polytetrafluoroethylene film member, the support wire member being intermediate the second planar expanded polytetrafluoroethylene film member and the planar expanded polytetrafluoroethylene film member.

3. The endoluminal prosthesis according to claim 1, further comprising a bonding agent joining the support wire member and the planar expanded polytetrafluoroethylene film member.

4. The endoluminal prosthesis according to claim 2, further comprising an adhesive interlayer interdisposed between the planar polytetrafluoroethylene film member and the planar expanded polytetrafluoroethylene film member.

5. The endoluminal prosthesis according to claim 2, wherein the planar polytetrafluoroethylene film member further comprises expanded polytetrafluoroethylene.

6. The endoluminal prosthesis according to claim 3, wherein the adhesive material is selected from the group consisting of polytetrafluoroethylene, polyurethane, polyethylene, polypropylene, polyamide, polyimide, polyesters, polypropylene, polyethylene, polyfluoroethylenes, silicone, fluorinated polyolefins, fluorinated ethylene/propylene copolymer, perfluoroalkoxy fluorocarbon, ethyl ene/tetrafluoroethylene copolymer, and polyvinylpyrrolidone.

7. The endoluminal prosthesis according to claim 3, wherein the bonding agent is disposed intermediate the wire member and an abluminal wall surface of polytetrafluoroethylene tubular substrate.

8. The endoluminal prosthesis according to claim 3, wherein the bonding agent further comprises a concentric cladding surrounding the wire member.

9. An endoluminal prosthesis comprising an elongate support wire member joined along its length to an elongate planar expanded polytetrafluoroethylene film member, the joined support wire member and planar expanded polytetrafluoroethylene film member being helically wound into an open cylindrical configuration with adjacent windings forming overlapping regions of the expanded polytetrafluoroethylene film member bonded to one another, further comprising a bonding agent joining the support wire member and the planar expanded polytetrafluoroethylene film member, wherein the bonding agent further comprises a concentric cladding surrounding the wire member.