CA2649705C - Twin bifurcated stent graft - Google Patents
Twin bifurcated stent graft Download PDFInfo
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- CA2649705C CA2649705C CA2649705A CA2649705A CA2649705C CA 2649705 C CA2649705 C CA 2649705C CA 2649705 A CA2649705 A CA 2649705A CA 2649705 A CA2649705 A CA 2649705A CA 2649705 C CA2649705 C CA 2649705C
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- leg
- tubular body
- stent graft
- stent
- aperture
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- 239000000463 material Substances 0.000 claims description 41
- 239000012530 fluid Substances 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 3
- 210000003090 iliac artery Anatomy 0.000 abstract description 55
- 210000000709 aorta Anatomy 0.000 abstract description 23
- 210000005166 vasculature Anatomy 0.000 abstract description 16
- 210000001367 artery Anatomy 0.000 abstract description 5
- 210000002254 renal artery Anatomy 0.000 description 11
- 206010002329 Aneurysm Diseases 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 4
- 102000008186 Collagen Human genes 0.000 description 3
- 108010035532 Collagen Proteins 0.000 description 3
- 102000010834 Extracellular Matrix Proteins Human genes 0.000 description 3
- 108010037362 Extracellular Matrix Proteins Proteins 0.000 description 3
- 229920001436 collagen Polymers 0.000 description 3
- 210000002744 extracellular matrix Anatomy 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 210000004876 tela submucosa Anatomy 0.000 description 3
- 229920004934 Dacron® Polymers 0.000 description 2
- 239000012620 biological material Substances 0.000 description 2
- 230000017531 blood circulation Effects 0.000 description 2
- 229920000295 expanded polytetrafluoroethylene Polymers 0.000 description 2
- 230000000968 intestinal effect Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 102000016942 Elastin Human genes 0.000 description 1
- 108010014258 Elastin Proteins 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 210000002469 basement membrane Anatomy 0.000 description 1
- 239000000560 biocompatible material Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 210000001951 dura mater Anatomy 0.000 description 1
- 229920002549 elastin Polymers 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 210000004877 mucosa Anatomy 0.000 description 1
- 210000003516 pericardium Anatomy 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 210000002784 stomach Anatomy 0.000 description 1
- 210000001519 tissue Anatomy 0.000 description 1
- 210000003932 urinary bladder Anatomy 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
- A61F2/954—Instruments specially adapted for placement or removal of stents or stent-grafts for placing stents or stent-grafts in a bifurcation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/00234—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
- A61F2/2476—Valves implantable in the body not otherwise provided for
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B2017/00238—Type of minimally invasive operation
- A61B2017/00243—Type of minimally invasive operation cardiac
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/86—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
- A61F2/89—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure the wire-like elements comprising two or more adjacent rings flexibly connected by separate members
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
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- A61F2002/065—Y-shaped blood vessels
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/04—Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts
- A61F2/06—Blood vessels
- A61F2/07—Stent-grafts
- A61F2002/075—Stent-grafts the stent being loosely attached to the graft material, e.g. by stitching
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- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0008—Fixation appliances for connecting prostheses to the body
- A61F2220/0016—Fixation appliances for connecting prostheses to the body with sharp anchoring protrusions, e.g. barbs, pins, spikes
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- A—HUMAN NECESSITIES
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- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2220/0075—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
Abstract
A stent graft has a tubular body with a first bifurcation with first and second legs extending from the bifurcation. One of the legs has a further bifurcation to define a side arm. The stent graft can be deployed into the vasculature of a patient with the tubular body being in an aorta of the patient, a first leg extending down an iliac artery, a second leg being directed towards a contralateral iliac artery and the side arm directed to an internal artery of one of the iliac arteries. One of the legs can include a valved aperture to enable the placement of an indwelling catheter therethrough.
Description
TWIN BIFURCATED STENT GRAFT
Description Technical Field This invention relates to a medical device and more particularly a device which can be deployed by endovascular means into the vasculature of a patient.
The following co-pending patent applications are referred to in the following description:
- U.S. Patent Application Publication No. US-2005-0182476-A1 ;
- PCT Patent Publication No. WO 98/53761 entitled "A Prosthesis and a Method of Deploying a Prosthesis";
- United States Patent Publication No. 2007/0123910;
- U.S. Patent Application Publication No. US-2006-0095118-A1 .
Background of the Invention There have been proposed bifurcated endovascular devices which can be deployed into the vasculature, particularly in the region of the aortic bifurcation, so that an aneurysm in the aorta can be bridged by placement of the endovascular device with a proximal portion which seals into a non-aneurysed portion of the aorta adjacent to the renal arteries, a first leg which extends down one iliac artery to a non-aneurysed portion of the iliac artery and another short leg into which a leg extension may be placed to extend into a non-aneurysed portion of the contralateral iliac artery.
=
Description Technical Field This invention relates to a medical device and more particularly a device which can be deployed by endovascular means into the vasculature of a patient.
The following co-pending patent applications are referred to in the following description:
- U.S. Patent Application Publication No. US-2005-0182476-A1 ;
- PCT Patent Publication No. WO 98/53761 entitled "A Prosthesis and a Method of Deploying a Prosthesis";
- United States Patent Publication No. 2007/0123910;
- U.S. Patent Application Publication No. US-2006-0095118-A1 .
Background of the Invention There have been proposed bifurcated endovascular devices which can be deployed into the vasculature, particularly in the region of the aortic bifurcation, so that an aneurysm in the aorta can be bridged by placement of the endovascular device with a proximal portion which seals into a non-aneurysed portion of the aorta adjacent to the renal arteries, a first leg which extends down one iliac artery to a non-aneurysed portion of the iliac artery and another short leg into which a leg extension may be placed to extend into a non-aneurysed portion of the contralateral iliac artery.
=
- 2 -There can be problems, however, if the aneurysm of the aorta extends down into one or other of the iliac arteries. Each of the common iliac arteries branches into the internal and external iliac arteries and it is necessary in such a situation that a blood flow path can be directed through an endovascular stent graft into each of these arteries.
The object of this invention is to provide a single endovascularly deployed medical device which can solve this problem or at least provide a physician with a useful alternative.
US 2002/169497 A1 discloses a stent graft comprising a tubular body of a biocompatible graft material defining a main lumen therethrough, an aperture defining a fenestration in the tubular body and a valve arrangement to prevent fluid flow through the aperture.
Throughout this specification the term distal with respect to a portion of the aorta, a deployment device or a prosthesis means the end of the aorta, deployment device or prosthesis further away in the direction of blood flow away from the heart and the term proximal means the portion of the aorta, deployment device or end of the prosthesis nearer to the heart. When applied to other vessels similar terms such as caudal and cranial should be understood.
Summary of the Invention In one form therefore the invention is said to reside in a stent graft comprising a tubular body of a biocompatible graft material defining a main lumen therethrough, a bifurcation in the tubular body at one end thereof and a first leg and a second leg extending from the bifurcation, the first leg being a long leg and the second leg being a short leg, the first and second legs having respective first and second lumens therethrough and the first and second lumens being in fluid communication with the main lumen, characterised by the first long leg comprising a side arm with a side arm lumen therethrough and the side arm lumen being in fluid communication with the first leg lumen, whereby the stent graft can be deployed into the vasculature of a patient with the tubular body being in an aorta of the patient, the first leg extending down an iliac artery, the second leg being directed towards a contralateral iliac artery and the side arm on the first leg directed to an intemal artery of the iliac artery.
- 2a -In one preferred embodiment the side arm comprises a tube of corrugated biocompatible graft material and the tube extends part helically around the first leg.
The object of this invention is to provide a single endovascularly deployed medical device which can solve this problem or at least provide a physician with a useful alternative.
US 2002/169497 A1 discloses a stent graft comprising a tubular body of a biocompatible graft material defining a main lumen therethrough, an aperture defining a fenestration in the tubular body and a valve arrangement to prevent fluid flow through the aperture.
Throughout this specification the term distal with respect to a portion of the aorta, a deployment device or a prosthesis means the end of the aorta, deployment device or prosthesis further away in the direction of blood flow away from the heart and the term proximal means the portion of the aorta, deployment device or end of the prosthesis nearer to the heart. When applied to other vessels similar terms such as caudal and cranial should be understood.
Summary of the Invention In one form therefore the invention is said to reside in a stent graft comprising a tubular body of a biocompatible graft material defining a main lumen therethrough, a bifurcation in the tubular body at one end thereof and a first leg and a second leg extending from the bifurcation, the first leg being a long leg and the second leg being a short leg, the first and second legs having respective first and second lumens therethrough and the first and second lumens being in fluid communication with the main lumen, characterised by the first long leg comprising a side arm with a side arm lumen therethrough and the side arm lumen being in fluid communication with the first leg lumen, whereby the stent graft can be deployed into the vasculature of a patient with the tubular body being in an aorta of the patient, the first leg extending down an iliac artery, the second leg being directed towards a contralateral iliac artery and the side arm on the first leg directed to an intemal artery of the iliac artery.
- 2a -In one preferred embodiment the side arm comprises a tube of corrugated biocompatible graft material and the tube extends part helically around the first leg.
- 3 -In an alternative embodiment the side arm comprises a tube of biocompatible graft material and at least one self expanding stent on the tube of biocompatible graft material. United States Patent Publication No.
entitled "Side Branch Stent Graft "discloses side arm tubes suitable for the present invention.
Preferably the first leg includes an aperture or fenestration proximally of the side arm and a valve arrangement to prevent fluid flow through the aperture from inside of the leg to outside of the leg.
Preferably the aperture includes a resilient reinforcement ring around the aperture.
The valve arrangement can comprise a sleeve of a biocompatible graft material within the first leg and a self expanding stent within the sleeve, the sleeve being fastened at its proximal end to the first leg proximal of the aperture and the self expanding stent being fastened to the sleeve, whereby the self expanding stent forces the sleeve against the inner surface of the first leg around the aperture to prevent fluid flow through the aperture from inside of the leg to outside of the leg.
In one preferred embodiment the sleeve of a biocompatible graft material comprises a cylindrical form. In an alternative embodiment the sleeve of a biocompatible graft material comprises a semi-cylindrical form.
Alternatively the valve can be formed from a self expanding stent to which a part cylindrical portion of biocompatible graft material is stitched along spaced apart struts of the self expanding stent. These two components together can form a valve assembly which can be stitched into the longer leg of the stent graft.
The valve assembly can further include a semi-circular resilient wire around the distal end of the part cylindrical portion of biocompatible graft material forming the valve member. This semi-circular resilient wire around the distal end of the part cylindrical portion of biocompatible graft material will assist with sealing off the fenestration by ensuring that the distal end of the valve member is held against the inside of the wall of the longer first leg of the stent graft.
=
entitled "Side Branch Stent Graft "discloses side arm tubes suitable for the present invention.
Preferably the first leg includes an aperture or fenestration proximally of the side arm and a valve arrangement to prevent fluid flow through the aperture from inside of the leg to outside of the leg.
Preferably the aperture includes a resilient reinforcement ring around the aperture.
The valve arrangement can comprise a sleeve of a biocompatible graft material within the first leg and a self expanding stent within the sleeve, the sleeve being fastened at its proximal end to the first leg proximal of the aperture and the self expanding stent being fastened to the sleeve, whereby the self expanding stent forces the sleeve against the inner surface of the first leg around the aperture to prevent fluid flow through the aperture from inside of the leg to outside of the leg.
In one preferred embodiment the sleeve of a biocompatible graft material comprises a cylindrical form. In an alternative embodiment the sleeve of a biocompatible graft material comprises a semi-cylindrical form.
Alternatively the valve can be formed from a self expanding stent to which a part cylindrical portion of biocompatible graft material is stitched along spaced apart struts of the self expanding stent. These two components together can form a valve assembly which can be stitched into the longer leg of the stent graft.
The valve assembly can further include a semi-circular resilient wire around the distal end of the part cylindrical portion of biocompatible graft material forming the valve member. This semi-circular resilient wire around the distal end of the part cylindrical portion of biocompatible graft material will assist with sealing off the fenestration by ensuring that the distal end of the valve member is held against the inside of the wall of the longer first leg of the stent graft.
=
- 4 -The biocompatible graft material can include polytetrafluoroethylene, Dacron, polyamide or any other suitable biocompatible graft material.
While Dacron, expanded polytetrafluoroethylene (ePTFE), or other synthetic biocompatible materials can be used for the tubular graft material for the stent graft, a naturally occurring biomaterial, such as collagen, is highly desirable, particularly a specially derived collagen material known as an extracellular matrix (ECM), such as small intestinal submucosa (SIS). Besides SIS, examples of ECM's include pericardium, stomach submucosa, liver basement membrane, urinary bladder submucosa, tissue mucosa, and dura mater.
SIS is particularly useful, and can be made in the fashion described in Badylak et al., US Patent 4,902,508; Intestinal Collagen Layer described in US
Patent 5,733,337 to Carr and in 17 Nature Biotechnology 1083 (Nov. 1999); Cook et al., WIPO Publication WO 98/22158, dated 28 May 1998. Irrespective of the origin of the material (synthetic versus naturally occurring), the material can be made thicker by making multilaminate constructs, for example SIS constructs as described in US Patents 5,968,096; 5,955,1 10; 5,885,619; and 5,71 1 ,969. In addition to xenogenic biomaterials, such as SIS, autologous tissue can be harvested as well, for use in forming the tubular graft material. Additionally Elastin or Elastin-Like Polypetides (ELPs) and the like offer potential as a material to fabricate the tubular graft material to form a device with exceptional biocompatibility.
SIS is available from Cook Biotech, West Lafayette, Indiana, USA.
It will be seen that by this invention there is provided a stent graft which has a main bifurcation to allow access into each of the iliac arteries and in one of the legs extending from the bifurcation there is a further bifurcation or branch which will enable access into the internal iliac artery. There is some advantage in having a double or twin bifurcation stent graft.
As discussed above there is preferably a valve arrangement proximal of the side arm or side branch of the iliac leg of the bifurcated stent graft. The valve allows an indwelling catheter to be provided through the sidearm in the iliac artery =
While Dacron, expanded polytetrafluoroethylene (ePTFE), or other synthetic biocompatible materials can be used for the tubular graft material for the stent graft, a naturally occurring biomaterial, such as collagen, is highly desirable, particularly a specially derived collagen material known as an extracellular matrix (ECM), such as small intestinal submucosa (SIS). Besides SIS, examples of ECM's include pericardium, stomach submucosa, liver basement membrane, urinary bladder submucosa, tissue mucosa, and dura mater.
SIS is particularly useful, and can be made in the fashion described in Badylak et al., US Patent 4,902,508; Intestinal Collagen Layer described in US
Patent 5,733,337 to Carr and in 17 Nature Biotechnology 1083 (Nov. 1999); Cook et al., WIPO Publication WO 98/22158, dated 28 May 1998. Irrespective of the origin of the material (synthetic versus naturally occurring), the material can be made thicker by making multilaminate constructs, for example SIS constructs as described in US Patents 5,968,096; 5,955,1 10; 5,885,619; and 5,71 1 ,969. In addition to xenogenic biomaterials, such as SIS, autologous tissue can be harvested as well, for use in forming the tubular graft material. Additionally Elastin or Elastin-Like Polypetides (ELPs) and the like offer potential as a material to fabricate the tubular graft material to form a device with exceptional biocompatibility.
SIS is available from Cook Biotech, West Lafayette, Indiana, USA.
It will be seen that by this invention there is provided a stent graft which has a main bifurcation to allow access into each of the iliac arteries and in one of the legs extending from the bifurcation there is a further bifurcation or branch which will enable access into the internal iliac artery. There is some advantage in having a double or twin bifurcation stent graft.
As discussed above there is preferably a valve arrangement proximal of the side arm or side branch of the iliac leg of the bifurcated stent graft. The valve allows an indwelling catheter to be provided through the sidearm in the iliac artery =
- 5 -at the time of deployment to assist with deployment of leg extension into the internal iliac artery.
United States Patent Publication No. 2005/0182476 entitled "Introducer for Iliac Side Branch Device" discloses an arrangement for using an indwelling catheter to access an internal iliac artery.
In this case the indwelling catheter can be extended and its guide wire snared from the contra-lateral artery and the leg extension placed into the internal iliac artery before the leg extension is placed into the iliac artery.
In a further form the invention is said to reside in a stent graft comprising a tubular body of a biocompatible graft material defining a main lumen therethrough an aperture defining a fenestration in the tubular body and a valve arrangement to prevent fluid flow through the aperture.
Preferably the aperture includes a resilient reinforcement ring around the aperture.
Preferably the valve arrangement comprises a sleeve of a biocompatible graft material within the tubular body and a self expanding stent within the sleeve, the sleeve being fastened at its proximal end to the first leg proximal of the aperture and the self expanding stent being fastened to the sleeve, whereby the self expanding stent forces the sleeve against the inner surface of the tubular body around the aperture to prevent fluid flow through the aperture.
The sleeve of a biocompatible graft material can comprise a cylindrical form or alternatively a semi-cylindrical form.
In one embodiment the valve arrangement comprises a valve assembly comprising a self expanding stent to which a part cylindrical portion of biocompatible graft material is stitched along spaced apart struts of the self expanding stent.
The valve assembly can further comprise a semi-circular resilient wire around the distal end of the part cylindrical portion of biocompatible graft material forming the valve member.
United States Patent Publication No. 2005/0182476 entitled "Introducer for Iliac Side Branch Device" discloses an arrangement for using an indwelling catheter to access an internal iliac artery.
In this case the indwelling catheter can be extended and its guide wire snared from the contra-lateral artery and the leg extension placed into the internal iliac artery before the leg extension is placed into the iliac artery.
In a further form the invention is said to reside in a stent graft comprising a tubular body of a biocompatible graft material defining a main lumen therethrough an aperture defining a fenestration in the tubular body and a valve arrangement to prevent fluid flow through the aperture.
Preferably the aperture includes a resilient reinforcement ring around the aperture.
Preferably the valve arrangement comprises a sleeve of a biocompatible graft material within the tubular body and a self expanding stent within the sleeve, the sleeve being fastened at its proximal end to the first leg proximal of the aperture and the self expanding stent being fastened to the sleeve, whereby the self expanding stent forces the sleeve against the inner surface of the tubular body around the aperture to prevent fluid flow through the aperture.
The sleeve of a biocompatible graft material can comprise a cylindrical form or alternatively a semi-cylindrical form.
In one embodiment the valve arrangement comprises a valve assembly comprising a self expanding stent to which a part cylindrical portion of biocompatible graft material is stitched along spaced apart struts of the self expanding stent.
The valve assembly can further comprise a semi-circular resilient wire around the distal end of the part cylindrical portion of biocompatible graft material forming the valve member.
- 6 -This then generally describes the invention but to assist with understanding reference will now be made to the accompanying drawings which show further embodiments of the invention.
Brief Description of the Drawing In the drawings;
Figure 1 shows a first embodiment of stent graft according to the invention as it would be deployed into the vasculature before placement of an iliac side branch;
Figure 2 shows the embodiment of Figure 1 with the side branch installed into the internal iliac artery and the leg extension in the contralateral iliac artery;
Figure 3 shows a schematic view of part of the leg of the stent graft of the present invention in particular showing one embodiment of the valve arrangement;
Figure 4 shows a cross-section of embodiment shown in Figure 3;
Figure 5 shows a same view as Figure 4 except with the indwelling catheter extending through the corrugated side arm and valve;
Figure 6 shows an alternative embodiment of stent graft deployed into a schematic vasculature with an alternative arrangement of side arm;
Figure 7 shows embodiment of Figure 6 at the stage where the indwelling catheter has been snared and pulled down the contralateral artery and the indwelling catheter has been used to deploy an extension piece into internal iliac artery;
Figure 8 shows an alternative embodiment of valve arrangement suitable for the embodiment of stent graft shown in Figures 6 and 7;
Figure 9 shown a cross-section thought the valve arrangement of Figure 8;
Figure 10 shows the valve arrangement of Figures 8 and 9 with an indwelling catheter extending through it;
Figure 11 shows an alternative embodiment of valve arrangement suitable for the embodiment of stent graft shown in Figures 6 and 7;
Figure 12 shown a detail of the valve arrangement of Figure 11 showing the self expanding stent with a valve member mounted onto it;
Figure 13 shown a cross-section thought valve arrangement of Figure 11;
Brief Description of the Drawing In the drawings;
Figure 1 shows a first embodiment of stent graft according to the invention as it would be deployed into the vasculature before placement of an iliac side branch;
Figure 2 shows the embodiment of Figure 1 with the side branch installed into the internal iliac artery and the leg extension in the contralateral iliac artery;
Figure 3 shows a schematic view of part of the leg of the stent graft of the present invention in particular showing one embodiment of the valve arrangement;
Figure 4 shows a cross-section of embodiment shown in Figure 3;
Figure 5 shows a same view as Figure 4 except with the indwelling catheter extending through the corrugated side arm and valve;
Figure 6 shows an alternative embodiment of stent graft deployed into a schematic vasculature with an alternative arrangement of side arm;
Figure 7 shows embodiment of Figure 6 at the stage where the indwelling catheter has been snared and pulled down the contralateral artery and the indwelling catheter has been used to deploy an extension piece into internal iliac artery;
Figure 8 shows an alternative embodiment of valve arrangement suitable for the embodiment of stent graft shown in Figures 6 and 7;
Figure 9 shown a cross-section thought the valve arrangement of Figure 8;
Figure 10 shows the valve arrangement of Figures 8 and 9 with an indwelling catheter extending through it;
Figure 11 shows an alternative embodiment of valve arrangement suitable for the embodiment of stent graft shown in Figures 6 and 7;
Figure 12 shown a detail of the valve arrangement of Figure 11 showing the self expanding stent with a valve member mounted onto it;
Figure 13 shown a cross-section thought valve arrangement of Figure 11;
- 7 -Figure 14 shows the valve arrangement of Figures 11 and 13 with an indwelling catheter extending through it:
Figure 15A to 15M show the various stages of deployment of a stent graft according to one embodiment of the present invention; and Figure 16A to 16K show the various stages of deployment of a stent graft according to another embodiment of the present invention.
Detailed Description Looking more closely at the drawings and in particular Figures 1 and 2 it will be seen that a schematic view of part of the vascular arrangement of a patient is illustrated incorporating a stent graft according to the present invention.
The vasculature comprises an aorta 10 in the region between the renal arteries 12 and the aortic bifurcation 14. Common iliac arteries 16 and 18 extend down from the aortic bifurcation 14. The aorta 10 has an aneurysm 20 which extends down into the common iliac artery 18 as far as the bifurcation 22 between the internal iliac artery 24 and the external iliac artery 26.
To traverse the aneurysm 20 a twin bifurcated aortic stent graft 40 according to one embodiment of the present invention has been deployed into the .aorta 10. In this drawing the introduction device which is used to deploy the stent graft into the vasculature has been omitted to assist clarity. In our earlier patent application, PCT Patent Publication No. WO 98/53761 entitled "A prosthesis and a method deploying a prosthesis" there is disclosed an introducer for a stent graft which is suitable for use with the present invention. The proximal end 42 of the = bifurcated stent graft 40 is engaged into non-aneurysed portion 28 of the aorta 10 just distal of the renal arteries 12. In this embodiment stent graft 40 has a proximally extending supra-renal exposed stent 44 with barbs 46 engaging the wall of the aorta proximal of the renal arteries to provide a secure position to prevent migration of the stent graft. The stent graft 40 has a short leg 50 and a long leg 52 extending from the graft bifurcation 54. The longer leg 52 has a sealing surface 56 at its distal end which engages into a non-aneurysed portion of the external iliac artery 26.
The longer leg 52 has a side arm 60 which in this embodiment is in the
Figure 15A to 15M show the various stages of deployment of a stent graft according to one embodiment of the present invention; and Figure 16A to 16K show the various stages of deployment of a stent graft according to another embodiment of the present invention.
Detailed Description Looking more closely at the drawings and in particular Figures 1 and 2 it will be seen that a schematic view of part of the vascular arrangement of a patient is illustrated incorporating a stent graft according to the present invention.
The vasculature comprises an aorta 10 in the region between the renal arteries 12 and the aortic bifurcation 14. Common iliac arteries 16 and 18 extend down from the aortic bifurcation 14. The aorta 10 has an aneurysm 20 which extends down into the common iliac artery 18 as far as the bifurcation 22 between the internal iliac artery 24 and the external iliac artery 26.
To traverse the aneurysm 20 a twin bifurcated aortic stent graft 40 according to one embodiment of the present invention has been deployed into the .aorta 10. In this drawing the introduction device which is used to deploy the stent graft into the vasculature has been omitted to assist clarity. In our earlier patent application, PCT Patent Publication No. WO 98/53761 entitled "A prosthesis and a method deploying a prosthesis" there is disclosed an introducer for a stent graft which is suitable for use with the present invention. The proximal end 42 of the = bifurcated stent graft 40 is engaged into non-aneurysed portion 28 of the aorta 10 just distal of the renal arteries 12. In this embodiment stent graft 40 has a proximally extending supra-renal exposed stent 44 with barbs 46 engaging the wall of the aorta proximal of the renal arteries to provide a secure position to prevent migration of the stent graft. The stent graft 40 has a short leg 50 and a long leg 52 extending from the graft bifurcation 54. The longer leg 52 has a sealing surface 56 at its distal end which engages into a non-aneurysed portion of the external iliac artery 26.
The longer leg 52 has a side arm 60 which in this embodiment is in the
- 8 -form of a corrugated tube extending in a part helical manner from its connection at a fenestration 62 into the longer leg 52. The side arm 60 extends in a distal direction and helically partly around the longer leg 52 and has a distal end 61 remote from its connection with the longer leg 52 which opens adjacent to the internal iliac artery 24.
A fenestration 64 is placed into the longer leg 52 proximal of the connection of the side arm 60 into the longer leg 52. The fenestration 64 has a valve arrangement within it to close it off as will be discussed with reference to Figures 3 to 5.
During deployment of the stent graft into the vasculature of a patient an in-dwelling catheter 66 extends through the side arm 60 and out through the valved fenestration 64. The indwelling catheter includes a guide wire 68.
Figure 2 shows the embodiment of Figure 1 but after deployment of a extension piece 70 into the corrugated side arm 60 and deployment of a leg extension 72 into the short leg 50 of the bifurcated stent graft 40 which seals into a non-aneurysed portion of the iliac artery 16. United States Patent 8,012,193 entitled "Introducer for Iliac Side Branch Device" discloses an arrangement for using an indwelling catheter to access an internal iliac artery. At this stage the indwelling catheter has been withdrawn and the fenestration 64 is closed off by the valve arrangement.
The extension piece 70 seals into a non-aneurysed portion of the internal iliac artery 24.
The process of deployment of a stent graft according to this embodiment of the invention will be discussed with reference to Figures 15A to 15M.
Figures 3, 4 and 5 show a first embodiment of valve arrangement suitable for the present invention.
In this embodiment the longer leg 52 of the bifurcated stent graft 40 as shown in Figure 1 has a fenestration 64 defined by a peripheral resilient ring 80 which is stitched into the tube of the longer leg 52. Inside the longer leg is a semi-circular portion of biocompatible graft material 82 and a resilient self-expanding zigzag stent 85 which engages with the semi-circular biocompatible graft material
A fenestration 64 is placed into the longer leg 52 proximal of the connection of the side arm 60 into the longer leg 52. The fenestration 64 has a valve arrangement within it to close it off as will be discussed with reference to Figures 3 to 5.
During deployment of the stent graft into the vasculature of a patient an in-dwelling catheter 66 extends through the side arm 60 and out through the valved fenestration 64. The indwelling catheter includes a guide wire 68.
Figure 2 shows the embodiment of Figure 1 but after deployment of a extension piece 70 into the corrugated side arm 60 and deployment of a leg extension 72 into the short leg 50 of the bifurcated stent graft 40 which seals into a non-aneurysed portion of the iliac artery 16. United States Patent 8,012,193 entitled "Introducer for Iliac Side Branch Device" discloses an arrangement for using an indwelling catheter to access an internal iliac artery. At this stage the indwelling catheter has been withdrawn and the fenestration 64 is closed off by the valve arrangement.
The extension piece 70 seals into a non-aneurysed portion of the internal iliac artery 24.
The process of deployment of a stent graft according to this embodiment of the invention will be discussed with reference to Figures 15A to 15M.
Figures 3, 4 and 5 show a first embodiment of valve arrangement suitable for the present invention.
In this embodiment the longer leg 52 of the bifurcated stent graft 40 as shown in Figure 1 has a fenestration 64 defined by a peripheral resilient ring 80 which is stitched into the tube of the longer leg 52. Inside the longer leg is a semi-circular portion of biocompatible graft material 82 and a resilient self-expanding zigzag stent 85 which engages with the semi-circular biocompatible graft material
-9-82 and engages it against the inside wall of the longer leg 52 and in particular over the fenestration 64. By this arrangement the fenestration 64 is held in a closed configuration. The semi-circular piece 82 is stitched by stitching 83 at its proximal end to the inner wall of the longer leg 52.
Substantially opposite to the fenestration 64 in the tubular longer leg 52 the side arm 60 extends from a fenestration 62 in the tubular longer leg 52.
Figure 5 shows the embodiment as shown in Figure 4 except that an indwelling catheter 66 and guide wire 68 through the indwelling catheter extend through the side arm 60 and through the fenestration 64 and this lifts the valve 82 off the fenestration 64 against the restoring force of the resilient self expanding stent 85.
Figures 6 and 7 show an alternative embodiment of bifurcated stent graft according to the present invention in the vasculature of a patient. The vasculature and the bifurcated stent graft are similar to the earlier embodiment shown in Figures 1 and 2 and the same reference numerals are used for corresponding items.
The vasculature comprises an aorta 10 in the region between the renal arteries 12 and the aortic bifurcation 14. Common iliac arteries 16 and 18 extend down from the aortic bifurcation. The aorta 10 has an aneurysm 20 which extends down into the common iliac artery 18 so far as the bifurcation 22 between the internal iliac artery 24 and the external iliac artery 26.
To traverse the aneurysm a bifurcated aortic stent graft 40 has been deployed into the aorta 10. The proximal end 42 of the bifurcated stent graft 40 =
is engaged into non-aneurysed portion 28 of the aorta 10 just distal of the renal arteries 12. In this embodiment stent graft 40 has a proximally extending supra-renal exposed stent 44 with barbs 46 engaging the wall of the aorta proximal of the renal arteries to provide a secure position to prevent migration of the stent graft. The stent graft 40 has a short leg 50 and a long leg 52 extending from the graft bifurcation 54. The longer leg 52 has a sealing surface 56 at its distal end which engages into a non-aneurysed portion of the external iliac artery 26.
The longer leg 52 has a side arm 90 which in this embodiment is in the
Substantially opposite to the fenestration 64 in the tubular longer leg 52 the side arm 60 extends from a fenestration 62 in the tubular longer leg 52.
Figure 5 shows the embodiment as shown in Figure 4 except that an indwelling catheter 66 and guide wire 68 through the indwelling catheter extend through the side arm 60 and through the fenestration 64 and this lifts the valve 82 off the fenestration 64 against the restoring force of the resilient self expanding stent 85.
Figures 6 and 7 show an alternative embodiment of bifurcated stent graft according to the present invention in the vasculature of a patient. The vasculature and the bifurcated stent graft are similar to the earlier embodiment shown in Figures 1 and 2 and the same reference numerals are used for corresponding items.
The vasculature comprises an aorta 10 in the region between the renal arteries 12 and the aortic bifurcation 14. Common iliac arteries 16 and 18 extend down from the aortic bifurcation. The aorta 10 has an aneurysm 20 which extends down into the common iliac artery 18 so far as the bifurcation 22 between the internal iliac artery 24 and the external iliac artery 26.
To traverse the aneurysm a bifurcated aortic stent graft 40 has been deployed into the aorta 10. The proximal end 42 of the bifurcated stent graft 40 =
is engaged into non-aneurysed portion 28 of the aorta 10 just distal of the renal arteries 12. In this embodiment stent graft 40 has a proximally extending supra-renal exposed stent 44 with barbs 46 engaging the wall of the aorta proximal of the renal arteries to provide a secure position to prevent migration of the stent graft. The stent graft 40 has a short leg 50 and a long leg 52 extending from the graft bifurcation 54. The longer leg 52 has a sealing surface 56 at its distal end which engages into a non-aneurysed portion of the external iliac artery 26.
The longer leg 52 has a side arm 90 which in this embodiment is in the
- 10 -form of a stented tube extending from a fenestration 92 in the longer leg 52.
The side arm 90 extends in a distal direction and has an end 94 remote from its connection with the longer leg 52 which opens adjacent to the internal iliac artery 24.
A fenestration 64 is placed into the longer leg 52 proximal of the connection of the side arm 90 into the longer leg 52. The fenestration 64 has a valve arrangement within it to close it off as will be discussed with reference to Figures 8 to 10.
During deployment of the stent graft into the vasculature of a patient an in-dwelling catheter 66 extends through the side arm 90 and out through the valved fenestration 64. The indwelling catheter includes a guide wire 68 therethrough.
Figure 7 shows the embodiment of Figure 6 but after deployment of a extension piece 70 into the side arm 90. United States Patent 8,012,193 entitled "Introducer for Iliac Side Branch Device" discloses an arrangement for using an indwelling catheter to access an internal iliac artery. At this stage the indwelling catheter has been withdrawn and the fenestration 64 is closed off by the valve arrangement. The extension piece 70 seals into a non-aneurysed portion of the internal iliac artery 24.
Figures 8, 9 and 10 show an alternative embodiment of valve arrangement suitable for the present invention.
In this embodiment of valve the longer leg 52 of the bifurcated stent graft 40 as shown in Figure 6 has a fenestration 64 defined by a peripheral resilient ring 80 which is stitched into the tubular wall of the longer leg 52. Inside the longer leg is a cylindrical portion of biocompatible graft material 96 and a self-expanding zigzag stent 98 which engages with the cylindrical biocompatible graft material 96 and engages it against the inside wall of the longer leg 52 and in particular over the fenestration 64. By this arrangement the fenestration 64 is held in a closed configuration. The cylindrical portion of biocompatible graft material 96 is stitched by stitching 99 at its proximal end to the inner wall of the longer leg 52.
Figure 10 shows the embodiment as shown in Figure 9 except that an indwelling catheter 66 and guide wire 68 through the catheter extend through the
The side arm 90 extends in a distal direction and has an end 94 remote from its connection with the longer leg 52 which opens adjacent to the internal iliac artery 24.
A fenestration 64 is placed into the longer leg 52 proximal of the connection of the side arm 90 into the longer leg 52. The fenestration 64 has a valve arrangement within it to close it off as will be discussed with reference to Figures 8 to 10.
During deployment of the stent graft into the vasculature of a patient an in-dwelling catheter 66 extends through the side arm 90 and out through the valved fenestration 64. The indwelling catheter includes a guide wire 68 therethrough.
Figure 7 shows the embodiment of Figure 6 but after deployment of a extension piece 70 into the side arm 90. United States Patent 8,012,193 entitled "Introducer for Iliac Side Branch Device" discloses an arrangement for using an indwelling catheter to access an internal iliac artery. At this stage the indwelling catheter has been withdrawn and the fenestration 64 is closed off by the valve arrangement. The extension piece 70 seals into a non-aneurysed portion of the internal iliac artery 24.
Figures 8, 9 and 10 show an alternative embodiment of valve arrangement suitable for the present invention.
In this embodiment of valve the longer leg 52 of the bifurcated stent graft 40 as shown in Figure 6 has a fenestration 64 defined by a peripheral resilient ring 80 which is stitched into the tubular wall of the longer leg 52. Inside the longer leg is a cylindrical portion of biocompatible graft material 96 and a self-expanding zigzag stent 98 which engages with the cylindrical biocompatible graft material 96 and engages it against the inside wall of the longer leg 52 and in particular over the fenestration 64. By this arrangement the fenestration 64 is held in a closed configuration. The cylindrical portion of biocompatible graft material 96 is stitched by stitching 99 at its proximal end to the inner wall of the longer leg 52.
Figure 10 shows the embodiment as shown in Figure 9 except that an indwelling catheter 66 and guide wire 68 through the catheter extend through the
- 11 -side arm 60 and through the fenestration 64 and this lifts the valve 96 for the fenestration 64.
Figures 11 to 14 show a further embodiment of valve arrangement suitable for the present invention.
In this embodiment the longer leg 200 of the bifurcated stent graft 40 (Figure 1) has a fenestration 202 defined by a peripheral resilient ring 204 which is stitched into the tube of the longer leg 200. Inside the longer leg is a self expanding stent 206 which has a plurality of struts 208 and bends 210. The self expanding stent 206 is shown in Figure 12.
The self expanding stent 206 has a valve member 212 formed from a piece of biocompatible graft material stitched onto spaced apart struts 208 to provide a part cylindrical surface on the self expanding stent 206 to form a valve assembly 214.
Around the lower circumference of the valve member 212 is a portion of resilient wire 213 retained by stitching 215 to assist with retaining the part circular shape of the valve member to endure good sealing against the inside surface of the tubular body of the longer leg 200.
This valve assembly is stitched into the tubular body of the longer leg 200 by stitching 216 at the bends 210 so that the valve member underlies the fenestration 202 and closes off the fenestration to flow therethrough from inside the longer leg to outside. A cross section of the valve at this stage is shown in Figure 13.
Substantially opposite to the fenestration 202 in the tubular longer leg 200 a side arm 218 extends from a fenestration 220 in the tubular longer leg 200.
The side arm 218 is in this embodiment formed from a corrugated graft material.
Figure 14 shows the embodiment as shown in Figure 13 except that an indwelling catheter 66 and guide wire 68 through the indwelling catheter extend through the side arm 218 and through the fenestration 202 and this lifts the valve member 212 off the fenestration 202 against the restoring force of the resilient self expanding stent 206.
Figure 15A to 15M show the various stages of deployment of a stent graft =
Figures 11 to 14 show a further embodiment of valve arrangement suitable for the present invention.
In this embodiment the longer leg 200 of the bifurcated stent graft 40 (Figure 1) has a fenestration 202 defined by a peripheral resilient ring 204 which is stitched into the tube of the longer leg 200. Inside the longer leg is a self expanding stent 206 which has a plurality of struts 208 and bends 210. The self expanding stent 206 is shown in Figure 12.
The self expanding stent 206 has a valve member 212 formed from a piece of biocompatible graft material stitched onto spaced apart struts 208 to provide a part cylindrical surface on the self expanding stent 206 to form a valve assembly 214.
Around the lower circumference of the valve member 212 is a portion of resilient wire 213 retained by stitching 215 to assist with retaining the part circular shape of the valve member to endure good sealing against the inside surface of the tubular body of the longer leg 200.
This valve assembly is stitched into the tubular body of the longer leg 200 by stitching 216 at the bends 210 so that the valve member underlies the fenestration 202 and closes off the fenestration to flow therethrough from inside the longer leg to outside. A cross section of the valve at this stage is shown in Figure 13.
Substantially opposite to the fenestration 202 in the tubular longer leg 200 a side arm 218 extends from a fenestration 220 in the tubular longer leg 200.
The side arm 218 is in this embodiment formed from a corrugated graft material.
Figure 14 shows the embodiment as shown in Figure 13 except that an indwelling catheter 66 and guide wire 68 through the indwelling catheter extend through the side arm 218 and through the fenestration 202 and this lifts the valve member 212 off the fenestration 202 against the restoring force of the resilient self expanding stent 206.
Figure 15A to 15M show the various stages of deployment of a stent graft =
- 12 -according to one embodiment of the present invention.
Figure 15A shows a schematic version of one embodiment of a stent graft according to the present invention loaded onto a delivery device. For convenience the sheath of the delivery device has been withdrawn to show the assembly inside it. The delivery device 100 has a nose cone dilator 102 at its proximal end and a stent graft assembly according to one embodiment of the present invention 104 is mounted onto the deployment device. This embodiment of stent graft 104 has an helical side arm 106 on the longer leg 108 of the stent graft 104. An indwelling catheter 110 extends from the deployment device 100 through the helical side arm 106 exiting at valved aperture 112 and extending to a groove in the nose cone dilator 102 outside of the stent graft 104. The indwelling catheter 110 has a flexible curved proximal end 116.
Detail of the tubular side =arm 106 and valve arrangement 112 are shown in Figure 15B. The tubular side arm 106 extends around the longer leg 108 from a fenestration 107 and the indwelling catheter 110 extends into the tubular side arm and out through the valved aperture 112. The valved aperture 112 has a flap valve 113 on its inside to ensure that the aperture is closed when the indwelling catheter is removed. The flap valve is substantially the same as the as the construction shown in Figures= 3 to 6.
Figure 15C shows a schematic vasculature of a patient including an aorta 10 renal arteries 12 and an aortic bifurcation 14. Extending from the aortic bifurcation are iliac arteries 16 and 18. The aorta has an aneurysm 20 which extends down the iliac artery to the position of the internal iliac artery 24.
The iliac bifurcation 22 defines the bifurcation between the internatal iliac artery 24 and the external iliac artery 26.
As shown in Figure 15C the deployment device 100 has been deployed over a guide wire 140 so that its nose cone 102 extends up into the aneurysm and the distal end of the nose cone 102 is substantially adjacent to the aortic bifurcation 14. As shown in the detail in Figure 15C the indwelling catheter and particularly its curved tip 116 has been compressed by the sheath 122 into the groove 114 in the nose cone dilator.
= CA 02649705 2014-02-10
Figure 15A shows a schematic version of one embodiment of a stent graft according to the present invention loaded onto a delivery device. For convenience the sheath of the delivery device has been withdrawn to show the assembly inside it. The delivery device 100 has a nose cone dilator 102 at its proximal end and a stent graft assembly according to one embodiment of the present invention 104 is mounted onto the deployment device. This embodiment of stent graft 104 has an helical side arm 106 on the longer leg 108 of the stent graft 104. An indwelling catheter 110 extends from the deployment device 100 through the helical side arm 106 exiting at valved aperture 112 and extending to a groove in the nose cone dilator 102 outside of the stent graft 104. The indwelling catheter 110 has a flexible curved proximal end 116.
Detail of the tubular side =arm 106 and valve arrangement 112 are shown in Figure 15B. The tubular side arm 106 extends around the longer leg 108 from a fenestration 107 and the indwelling catheter 110 extends into the tubular side arm and out through the valved aperture 112. The valved aperture 112 has a flap valve 113 on its inside to ensure that the aperture is closed when the indwelling catheter is removed. The flap valve is substantially the same as the as the construction shown in Figures= 3 to 6.
Figure 15C shows a schematic vasculature of a patient including an aorta 10 renal arteries 12 and an aortic bifurcation 14. Extending from the aortic bifurcation are iliac arteries 16 and 18. The aorta has an aneurysm 20 which extends down the iliac artery to the position of the internal iliac artery 24.
The iliac bifurcation 22 defines the bifurcation between the internatal iliac artery 24 and the external iliac artery 26.
As shown in Figure 15C the deployment device 100 has been deployed over a guide wire 140 so that its nose cone 102 extends up into the aneurysm and the distal end of the nose cone 102 is substantially adjacent to the aortic bifurcation 14. As shown in the detail in Figure 15C the indwelling catheter and particularly its curved tip 116 has been compressed by the sheath 122 into the groove 114 in the nose cone dilator.
= CA 02649705 2014-02-10
- 13 -As shown in Figure 15D the sheath 122 of the deployment device has been withdrawn slightly to release the curved tip 116 of the indwelling catheter 110 and the indwelling guide wire 124 from the indwelling catheter 110 has been extended.
Because of the curved end of the indwelling catheter the indwelling guide wire has extended down the contra-lateral iliac artery 16. A snare catheter 128 has been deployed into the contra-lateral common iliac artery and a snare 130 of the snare catheter 128 has been extended to grasp the guide wire 124. The guide wire 124 is extracted via the snare catheter 128 so that it becomes a through-and-through guide wire. It is important at this stage to ensure there is slack maintained in the guide wire at the aortic bifurcation to prevent damage to the aortic bifurcation. This position is shown in Figure 15E.
The use of and indwelling catheter with a curved tip to facilitate snaring from a contralateral iliac artery is taught in US Patent Publication No. 2007/0123910 entitled 'Stent Graft Introducer'.
As shown in Figure 15F the deployment device 100 in then advanced so that the nose cone dilator 102 is proximal of the renal arteries 12. This draws the indwelling guide wire 124 also up into the aorta 10.
The sheath 122 of the deployment device 100 is then withdrawn to release the shorter leg 109 of the stent graft 104. This stage is shown in Figure 15G.
As shown in Figure 15H the indwelling catheter is withdrawn down into the contra-lateral iliac artery 16 and the sheath 122 is withdrawn so that it is distal of the distal end of the side arm 106 while still retaining the distal end of the longer leg 108.
As shown in Figure 151 a dilator and sheath introducer 130 is advanced over the guide wire 124 in the contra-lateral iliac artery 16 and the indwelling catheter 110 and extension arm deployment device are tracked over the guide wire 124 so that the nose cone 132 of the sheath introducer enters the valved aperture 112 and tracks over the guide wire 124 into the side arm 106 until it exits the distal end of the side arm 134 as shown in Figure 15J. The sheath introducer nose cone 132 is then withdrawn leaving the sheath 130 in place. At
Because of the curved end of the indwelling catheter the indwelling guide wire has extended down the contra-lateral iliac artery 16. A snare catheter 128 has been deployed into the contra-lateral common iliac artery and a snare 130 of the snare catheter 128 has been extended to grasp the guide wire 124. The guide wire 124 is extracted via the snare catheter 128 so that it becomes a through-and-through guide wire. It is important at this stage to ensure there is slack maintained in the guide wire at the aortic bifurcation to prevent damage to the aortic bifurcation. This position is shown in Figure 15E.
The use of and indwelling catheter with a curved tip to facilitate snaring from a contralateral iliac artery is taught in US Patent Publication No. 2007/0123910 entitled 'Stent Graft Introducer'.
As shown in Figure 15F the deployment device 100 in then advanced so that the nose cone dilator 102 is proximal of the renal arteries 12. This draws the indwelling guide wire 124 also up into the aorta 10.
The sheath 122 of the deployment device 100 is then withdrawn to release the shorter leg 109 of the stent graft 104. This stage is shown in Figure 15G.
As shown in Figure 15H the indwelling catheter is withdrawn down into the contra-lateral iliac artery 16 and the sheath 122 is withdrawn so that it is distal of the distal end of the side arm 106 while still retaining the distal end of the longer leg 108.
As shown in Figure 151 a dilator and sheath introducer 130 is advanced over the guide wire 124 in the contra-lateral iliac artery 16 and the indwelling catheter 110 and extension arm deployment device are tracked over the guide wire 124 so that the nose cone 132 of the sheath introducer enters the valved aperture 112 and tracks over the guide wire 124 into the side arm 106 until it exits the distal end of the side arm 134 as shown in Figure 15J. The sheath introducer nose cone 132 is then withdrawn leaving the sheath 130 in place. At
- 14 -this stage the indwelling guide wire 124 is still in a through-and-through position.
As shown in Figure 15K, another guide wire 136 is introduced through the sheath 130 and extended from the sheath 130 to enter into the internal iliac artery 24.
As shown in Figure 15L a side arm deployment device is deployed over the guide wire 136 into the internal iliac artery 24 so that balloon expandable covered stent 140 extends into the internal iliac artery 24 from the side arm 106. As shown in Figure 15M, the indwelling guide wire 124 is then removed and the position of the distal end of the longer leg 108 is set into the external iliac artery 26 and the balloon expandable covered stent 140 is expanded. The sheath 130 is then withdrawn and the valve 112 automatically closes. A leg extension 144 is then placed into the short leg 107 of the graft 104. The proximal end 146 of the stent graft is also released from the deployment device 100 such that a portion of the graft seals into a non-aneurysed portion of the aorta 10 distal of the renal arteries 12 while an uncovered suprarenal stent 148 extends over the renal arteries to provide secure fixation.
Figures 16A to 16K show an alternative embodiment of stent graft according to the present invention and the process of deploying such a stent graft in the vasculature of a patient.
The stent graft in this embodiment comprises a two piece body with a proximal portion 150 and a distal portion 152 which when joined together into the vasculature of the patient provide a composite stent graft. The proximal portion 150 has the proximally extending suprarenal stents 154 and the distal portion is bifurcated with a shorter leg 156 and longer leg 158. The longer leg 158 has the helical side arm 160 and the valved aperture 162 through which the indwelling catheter 164 extends.
The process of deployment of the stent graft of this embodiment is substantially similar to that shown in Figures 15 C to 15M except that, as shown in Figure 16C, as a first stage the proximal portion 150 is deployed and released into the aorta. Subsequently a separate device 170 with an indwelling catheter 164 is introduced which carries the distal portion 152 and the process of snaring the indwelling guide wire, release of the main stent graft and deployment of a side
As shown in Figure 15K, another guide wire 136 is introduced through the sheath 130 and extended from the sheath 130 to enter into the internal iliac artery 24.
As shown in Figure 15L a side arm deployment device is deployed over the guide wire 136 into the internal iliac artery 24 so that balloon expandable covered stent 140 extends into the internal iliac artery 24 from the side arm 106. As shown in Figure 15M, the indwelling guide wire 124 is then removed and the position of the distal end of the longer leg 108 is set into the external iliac artery 26 and the balloon expandable covered stent 140 is expanded. The sheath 130 is then withdrawn and the valve 112 automatically closes. A leg extension 144 is then placed into the short leg 107 of the graft 104. The proximal end 146 of the stent graft is also released from the deployment device 100 such that a portion of the graft seals into a non-aneurysed portion of the aorta 10 distal of the renal arteries 12 while an uncovered suprarenal stent 148 extends over the renal arteries to provide secure fixation.
Figures 16A to 16K show an alternative embodiment of stent graft according to the present invention and the process of deploying such a stent graft in the vasculature of a patient.
The stent graft in this embodiment comprises a two piece body with a proximal portion 150 and a distal portion 152 which when joined together into the vasculature of the patient provide a composite stent graft. The proximal portion 150 has the proximally extending suprarenal stents 154 and the distal portion is bifurcated with a shorter leg 156 and longer leg 158. The longer leg 158 has the helical side arm 160 and the valved aperture 162 through which the indwelling catheter 164 extends.
The process of deployment of the stent graft of this embodiment is substantially similar to that shown in Figures 15 C to 15M except that, as shown in Figure 16C, as a first stage the proximal portion 150 is deployed and released into the aorta. Subsequently a separate device 170 with an indwelling catheter 164 is introduced which carries the distal portion 152 and the process of snaring the indwelling guide wire, release of the main stent graft and deployment of a side
- 15 -arm extension into the internal iliac artery as shown in Figures 16D to 16J is substantially the same as shown in Figures 15C to 15L. The final stage as shown in Figure 16K of the deployment of the two piece stent graft includes release of the distal portion 152 inside the proximal portion 150 and the deployment of a leg extension 172 into the short leg 156 and release of the distal end of the longer leg 158.
It will be realised that an alternative embodiment access for deployment into the internal iliac artery maybe by a brachial approach and in such case the indwelling catheter in the side arm may extend through the main lumen of the stent graft and the valved aperture may not be necessary in such an embodiment.
Throughout this specification various indications have been given as to the scope of invention but invention not limited to any one of these but may reside in two or more of these combined together. The examples are given for illustration only and not for limitations.
It will be realised that an alternative embodiment access for deployment into the internal iliac artery maybe by a brachial approach and in such case the indwelling catheter in the side arm may extend through the main lumen of the stent graft and the valved aperture may not be necessary in such an embodiment.
Throughout this specification various indications have been given as to the scope of invention but invention not limited to any one of these but may reside in two or more of these combined together. The examples are given for illustration only and not for limitations.
Claims (9)
1. A stent graft comprising a tubular body of a biocompatible graft material defining a lumen therethrough and having an aperture defining a fenestration in the tubular body, the fenestration having a valve arrangement arranged to prevent fluid flow through the aperture from inside of the tubular body to outside of the tubular body, the valve arrangement comprising a sleeve of a biocompatible graft material within the tubular body and a self-expanding stent within the sleeve, and the self expanding stent being fastened to the sleeve, whereby the self-expanding stent forces the sleeve against the inner surface of the tubular body around the aperture to prevent fluid flow through the aperture.
2. The stent graft as in Claim 1, wherein the aperture includes a resilient reinforcement ring around the aperture.
3. The stent graft as in Claim 1, wherein the sleeve is fastened at its proximal end to the tubular body proximal of the aperture.
4. The stent graft as in Claim 3, wherein the sleeve of a biocompatible graft material comprises a cylindrical form.
5. The stent graft as in Claim 3 wherein the sleeve of a biocompatible graft material comprises a semi-cylindrical form.
6. A stent graft comprising a tubular body of a biocompatible graft material defining a lumen therethrough and having an aperture defining a fenestration in the tubular body, the fenestration having a valve arrangement arranged to prevent fluid flow through the aperture from inside of the tubular body to outside of the tubular body, the valve arrangement comprising part cylindrical portion of a biocompatible graft material within the tubular body to form a valve member and a valve assembly comprising a self-expanding stent to which the part cylindrical portion of biocompatible graft material is attached.
7. The stent graft as in Claim 6, wherein the part cylindrical portion of biocompatible graft material is stitched along spaced apart struts of the self-expanding stent.
8. The stent graft as in Claim 7, wherein the valve assembly further comprises a semicircular resilient wire around a distal end of the part cylindrical portion of biocompatible graft material.
9. A stent graft as in any one of claims 1 to 8, wherein the stent graft comprises a main tubular body defining a main lumen therethrough and having a bifurcation at one end thereof, and a first leg and a second leg extending from the bifurcation, the first leg constituting said first-mentioned tubular body and being a long leg and the second leg being a short leg, the first and second legs having respective first and second lumens therethrough and the first and second lumens being in fluid communication with the main lumen, and the first leg comprising a side arm with a side arm lumen therethrough and the side arm lumen being in fluid communication with the first leg lumen, wherein the fenestration and the arrangement valve are provided in the first leg proximally of the side arm.
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PCT/US2007/009665 WO2007124053A1 (en) | 2006-04-19 | 2007-04-19 | Twin bifurcated stent graft |
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CA2649705C true CA2649705C (en) | 2015-12-01 |
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CA2649705A Active CA2649705C (en) | 2006-04-19 | 2007-04-19 | Twin bifurcated stent graft |
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EP (1) | EP2007313B1 (en) |
JP (2) | JP2009534104A (en) |
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2007
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US9707113B2 (en) | 2017-07-18 |
EP2007313B1 (en) | 2018-05-16 |
WO2007124053A1 (en) | 2007-11-01 |
JP2009534104A (en) | 2009-09-24 |
JP5707584B2 (en) | 2015-04-30 |
AU2007240703C1 (en) | 2012-06-14 |
AU2007240703B2 (en) | 2012-02-02 |
EP2007313A1 (en) | 2008-12-31 |
US20070250154A1 (en) | 2007-10-25 |
JP2012210545A (en) | 2012-11-01 |
US10143576B2 (en) | 2018-12-04 |
AU2007240703A1 (en) | 2007-11-01 |
US20170325978A1 (en) | 2017-11-16 |
CA2649705A1 (en) | 2007-11-01 |
CN101484090A (en) | 2009-07-15 |
CN101484090B (en) | 2011-04-27 |
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