US20040254628A1 - One-branch stent-graft for bifurcated lumens - Google Patents
One-branch stent-graft for bifurcated lumensDownload PDFInfo
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- US20040254628A1 US20040254628A1US10/461,898US46189803AUS2004254628A1US 20040254628 A1US20040254628 A1US 20040254628A1US 46189803 AUS46189803 AUS 46189803AUS 2004254628 A1US2004254628 A1US 2004254628A1
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- graft
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- bifurcation
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Classifications
- 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
- A61F2/02—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
- 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
- A61F2/82—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
- A61F2/90—Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure characterised by a net-like or mesh-like structure
- 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
- A61F2/02—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
- A61F2002/065—Y-shaped blood vessels
- A61F2002/067—Y-shaped blood vessels modular
- 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
- A61F2/02—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
Definitions
- the present inventionrelates to a one-branch stent-graft for use in bifurcated body lumens. More specifically, the present invention relates to a stent graft including two branches, wherein a closure prevents fluid from flowing to one of the branches.
- a stent-graft(a stent with a graft layer lining or covering it) is typically used to provide a prosthetic intraluminal wall, e.g., in the case of a stenosis or aneurysm, to provide an unobstructed conduit for blood in the area of the stenosis or aneurysm.
- a stent-graftmay be endoluminally deployed in a body lumen, a blood vessel for example, at the site of a stenosis or aneurysm by so-called “minimally invasive techniques” in which the stent-graft is compressed radially inwards and is delivered by a catheter to the site where it is required, through the patient's skin, or by a “cut down” technique at a location where the blood vessel concerned is accessible.
- minimally invasive techniquesin which the stent-graft is compressed radially inwards and is delivered by a catheter to the site where it is required, through the patient's skin, or by a “cut down” technique at a location where the blood vessel concerned is accessible.
- a one branch design stent-graftis typically utilized at a native vessel bifurcation to direct fluid into only one of the branches of the bifurcation.
- an aorto-uni-iliac stent-graftprovides an unobstructed conduit for blood to flow from the aorta through only one of the two iliacs.
- bloodflows through the single branch stent-graft to the bifurcated vessel branch of the native bifurcation that contains the stent-graft, while blood is prevented from flowing to the other bifurcated branch of the native bifurcation.
- Typical single branch design stent-graftshave a tendency to work their way distally from the originally deployed position. It will be appreciated by a person skilled in the art that it is desirable to prevent stents from migrating out of position. In particular, where the site of desired application of the stent or prosthesis is a native vessel bifurcation, the distal migration associated with the use of the prior art prostheses constitutes a significant disadvantage.
- a stent-graft of this inventionincludes a bifurcated stent, i.e., an unbifurcated portion in fluid communication with two branches.
- the stent-graftfurther includes a graft that lines or covers at least part of the bifurcated stent.
- the graft of this stent graftdefines a fluid passageway from the unbifurcated portion into one of the bifurcated stent branches.
- a closurewhich may be part of the graft, prevents fluid from flowing to the other of the branches.
- the stent-graftis preferably adapted for placement of the stent bifurcation adjacent the native bifurcation of a body lumen to resist distal migration of the stent-graft.
- One use of such stent-graftsis in bypassing abdominal aortic aneurysms where a femoral-femoral bypass is surgically installed to provide blood flow to the occluded iliac.
- a stent-graftis provided that is adapted for placement at a native vessel bifurcation.
- the stent-graftincludes a bifurcated stent with a proximal portion adapted for placement in an unbifurcated region of the native bifurcation.
- proximalmeans the unbifurcated end of the stent or stent-graft, i.e., nearest to the heart when the bifurcated lumen is the abdominal aorta
- distalmeans the opposite, i.e., the bifurcated end of the stent or stent-graft.
- the bifurcated stentfurther includes two distal portions.
- the first distal portionis adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation.
- the second distal portionextends toward and into the other bifurcated branch of the native bifurcation.
- a graft liningdefines a fluid passage that extends from the proximal portion of the bifurcated stent to the first distal portion of the bifurcated stent.
- the graft liningis closed to the other of the bifurcated branches.
- a stent-graft adapted for placement at a native vessel bifurcationincludes a bifurcated stent with a proximal portion adapted for placement in an unbifurcated region of the native bifurcation.
- the bifurcated stentfurther includes two distal portions. The first distal portion is adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation. The second distal portion extends toward and into the other bifurcated branch of the native bifurcation.
- a graft lining or coveringdefines a fluid passage that extends from the proximal portion of the bifurcated stent to the distal portions of the bifurcated stent.
- An occluder deviceis adapted for placement in the second distal portion. The occluder prevents fluid passage through the second distal portion of the bifurcated stent-graft and to the second branch of the bifurcated lumen.
- a stent-graftis provided that is adapted for placement at a native vessel bifurcation.
- the stent-graftincludes a straight bifurcated stent-graft and a tapered stent-graft.
- the straight bifurcated stent-graftincludes a proximal portion adapted for placement in an unbifurcated region of the native bifurcation, and two distal portions.
- the first distal portionis adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation.
- the second distal portionextends toward and into the other bifurcated branch of the native bifurcation.
- a graft lining or coveringextends from the proximal portion of the straight bifurcated stent-graft to the distal portions of the straight bifurcated stent-graft.
- the tapered stent-graftincludes a proximal tapered portion and a distal portion.
- the proximal portionis adapted for placement in the unbifurcated portion of the straight stent-graft and the distal portion is adapted for placement in the first distal portion of the straight stent-graft.
- a graft lining or coveringextends from the proximal portion of the tapered stent-graft to the distal portion of the tapered stent-graft.
- the tapered stent-graftdefines a fluid passage to the first distal portion of the straight bifurcated stent-graft, and is closed to fluid passage into the second distal portion of the straight bifurcated stent-graft by the graft lining or covering of the tapered stent-graft.
- FIG. 1Ais a front view of a stent-graft including a bifurcated stent and a graft lining in accordance with one embodiment of the present invention
- FIG. 1Bis a detail view of the bifurcated stent of FIG. 1A;
- FIG. 1Cis a detail view of the graft lining of FIG. 1A;
- FIG. 2Ais a front view of a stent-graft including a bifurcated stent, a graft lining, and an occluder device in accordance with another embodiment of the present invention
- FIG. 2Bis a detail view of the bifurcated stent of FIG. 2A;
- FIG. 2Cis a detail view of the graft lining of FIG. 2A;
- FIG. 2Dis a detail view of the occluder device of FIG. 2A;
- FIG. 3Ais a front view of a stent-graft including a straight bifurcated stent and graft and a tapered stent and graft in accordance with yet another embodiment of the present invention
- FIG. 3Bis a detail view of the straight bifurcated stent and graft of FIG. 3A.
- FIG. 3Cis a detail view of the tapered stent and graft of FIG. 3A.
- a stent-graft 10is adapted for placement at a native vessel bifurcation.
- the stent-graft 10includes a bifurcated stent 12 with a proximal portion 14 adapted for placement in an unbifurcated region of the native bifurcation.
- the bifurcated stent 12further includes two distal portions 16 , 18 .
- the first distal portion 16is adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation.
- the second distal portion 18extends toward the other bifurcated branch of the native bifurcation.
- a graft lining 20defines a fluid passage that extends from the proximal portion 14 of the bifurcated stent 12 to the distal portion 16 of the bifurcated stent 12 .
- the graft lining 20is adapted to extend to one of the bifurcated branches of the native bifurcation, but is closed to the other of the bifurcated branches.
- the stent-graft 10is adapted for placement of the stent bifurcation 22 adjacent the native bifurcation.
- FIG. 1Bis a detail view of the bifurcated stent 12 illustrated in FIG. 1A.
- the bifurcated stent 12has a radially compressed configuration for introduction into a lumen, and a radially expanded configuration for deployment within the lumen.
- the bifurcated stent 12is compressed radially inwards and is delivered by a catheter to the site where it is required through the patient's skin, or by a “cut down” technique in which the blood vessel concerned is exposed by minor surgical means at an accessible location thereof.
- the stent 12is caused or allowed to re-expand to a predetermined diameter in the vessel and the catheter is withdrawn.
- FIG. 1Cis a detail view of the graft lining 20 illustrated in FIG. 1A.
- the graft lining 20is attached to an inside surface of the bifurcated stent 12 (as illustrated in FIG. 1A) by sewing, suturing, or bonding.
- the stent-graft 10 illustrated in FIG. 1Ais juxtaposed or extends across a bifurcation in an artery or vein such as, for example, the bifurcation in the mammalian aortic artery into the common iliac arteries.
- a bifurcationis referred to throughout this specification as a native vessel bifurcation.
- AAAabdominal aortic aneurysm
- the stent-graft 10is deployed such that the stent bifurcation 22 is placed adjacent the native vessel bifurcation.
- the first distal portion 16extends into one of the bifurcated branches of the native bifurcation, while the second distal portion 18 extends toward and into the other bifurcated branch of the native bifurcation.
- the tapered shape of the graft lining 20results in a fluid passage that extends from the proximal portion 14 of the bifurcated stent 12 to the first distal portion 16 of the bifurcated stent 12 .
- bloodflows through the stent-graft 10 to the bifurcated vessel branch of the native bifurcation that contains the first distal portion 16 , while blood is prevented from flowing through the stent-graft 10 to the other bifurcated branch of the native bifurcation that contains the second distal portion 18 .
- the second distal portion 18functions not as a fluid passageway, but as a structural member.
- the relationship among the first distal portion 16 , the stent bifurcation 22 , and the second distal portion 18allows the stent graft 10 to straddle or span the native vessel bifurcation when deployed, placing the stent bifurcation 22 adjacent the native vessel bifurcation tending to prevent distal migration. Actual contact between the stent bifurcation 22 and the native vessel bifurcation may prevent the stent-graft 10 from working its way down away from its originally deployed position.
- the stent and graftmay be formed of conventional materials, such as nitinol and ePTFE.
- another stent-graft 30adapted for placement at a native vessel bifurcation, includes a bifurcated stent 32 with a proximal portion 34 adapted for placement in an unbifurcated region of the native bifurcation.
- the bifurcated stent 32further includes two distal portions 36 and 38 .
- the first distal portion 36is adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation.
- the second distal portion 38extends toward and into the other bifurcated branch of the native bifurcation.
- a graft lining or covering 40(graft covering 40 is represented in FIG.
- the 2Adefines a fluid passage that extends from the proximal portion 34 of the bifurcated stent 32 to the distal portions 36 and 38 of the bifurcated stent 32 .
- An occluder device 42is adapted for placement in the second distal portion 38 .
- the occluder 42prevents fluid passage through the second distal portion 38 and to one of the bifurcated branches of the native bifurcation.
- the stent-graft 30is adapted for placement of the stent bifurcation 44 adjacent the native bifurcation.
- FIG. 2Bis a detail view of the bifurcated stent 32 illustrated in FIG. 2A.
- the bifurcated stent 32has a radially compressed configuration for introduction into a lumen, and a radially expanded configuration for deployment within the lumen.
- the bifurcated stent 32is compressed radially inwards and is delivered by a catheter to the site where it is required through the patient's skin, or by a “cut down” technique in which the blood vessel concerned is exposed by minor surgical means.
- the stent 32is caused or allowed to re-expand to a predetermined diameter in the vessel.
- FIG. 2Cis a detail view of the graft lining or covering 40 illustrated in FIG. 2A.
- the graft lining or covering 40may be attached to an inside surface of the bifurcated stent 32 , functioning as a lining.
- the graft lining or covering 40may be attached to an outside surface of the bifurcated stent 32 (as illustrated in FIG. 2A), functioning as a covering.
- FIG. 2Dis a detail view of one form of occluder useful in combination with stent graft 30 .
- an occluder device 42comprising a closed, straight stent-graft, typically adapted for endoluminal delivery into the second distal portion 38 of the bifurcated stent 32 after the stent-graft 30 has been deployed and expanded.
- occluder device 42Similar to the bifurcated stent 32 , occluder device 42 has a radially compressed configuration for introduction into a lumen, and a radially expanded configuration for deployment within the lumen.
- Occluder device 42includes a stent 43 and a graft 44 , either lining or covering part or all of stent 43 (as illustrated in FIGS. 2A and 2D). Graft 43 , however, is closed at one end to occlude fluid flow through the occluder device 42 and thus through the second distal portion 38 of the stent-graft 30 .
- stent-graft 30is juxtaposed or extends across a bifurcation in an artery or vein.
- Bifurcated stent 32is deployed such that stent bifurcation 44 is placed near or adjacent the native vessel bifurcation.
- First distal portion 36extends into one of the bifurcated branches of the native bifurcation, while the second distal portion 38 extends toward and into the other bifurcated branch of the native bifurcation.
- occluder device 42is placed in the second distal portion 38 of the bifurcated stent 32 , so that graft 43 defines a closed fluid passage, by which occluder device 42 prevents fluid from flowing through second distal portion 38 of bifurcated stent 32 .
- Such a configurationresults in a fluid passage that extends from proximal portion 34 of bifurcated stent 32 to first distal portion 36 of bifurcated stent 32 .
- second distal portion 38 of stent 34functions not as a fluid passageway, but as a structural member.
- the relationship among the first distal portion 36 , the stent bifurcation 44 , and the second distal portion 38allows stent-graft 30 to straddle or span the native vessel bifurcation when deployed, placing the stent bifurcation 44 adjacent the native vessel bifurcation.
- Such a configurationtends to resist distal migration.
- contact between the stent bifurcation 44 and the native vessel bifurcationprevents the stent-graft 30 from working its way down away from its originally deployed position.
- Stent-graft 50adapted for placement at a native vessel bifurcation.
- Stent-graft 50includes a straight bifurcated stent-graft 52 and a tapered stent-graft 54 .
- Straight bifurcated stent-graft 52includes a proximal portion 56 adapted for placement in an unbifurcated region of the native bifurcation, and two distal portions 58 and 60 .
- First distal portion 58is adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation.
- Second bifurcation 60extends toward and into the other bifurcated branch of the native bifurcation.
- a graft lining or covering 62(graft covering 62 is represented in FIG. 3B) extends from proximal portion 56 of straight bifurcated stent-graft 52 to distal portions 58 and 60 of straight bifurcated stent-graft 52 .
- Tapered stent-graft 54includes a proximal tapered portion 64 and a distal portion 66 .
- Distal portion 66is adapted for placement, after the straight stent-graft 52 has been deployed and expanded, in proximal portion 56 and first distal portion 58 of straight bifurcated stent-graft 52 .
- a graft lining or covering 68extends from proximal portion 64 of the tapered stent-graft 54 to distal portion 66 of tapered stent-graft 54 .
- Tapered stent-graft 54defines a closed fluid passage to first distal portion 58 of straight bifurcated stent-graft 52 , and is closed to fluid passage into second distal portion 60 of straight bifurcated stent-graft 52 .
- FIGS. 3B and 3Care detail views of the straight bifurcated stent-graft 52 and the tapered stent-graft 54 , respectively, illustrated in FIG. 3A.
- Both stent-grafts 52 and 54have a radially compressed configuration for introduction into a lumen, and a radially expanded configuration for deployment within the lumen.
- the stent-grafts 52 and 54are compressed radially inwards and are delivered by a catheter to the site where it is required through the patient's skin, or by a “cut down” technique in which the blood vessel concerned is exposed by minor surgical means.
- the stent-grafts 52 and 54are positioned at the correct location, the stent-grafts 52 and 54 are caused or allowed to re-expand to a predetermined diameter in the vessel.
- Graft linings or coverings 62 and 68may be attached to an inside surface of each respective stent 52 and 54 , functioning as linings. Alternatively, graft linings or coverings 62 and 68 may be attached to an outside surface of each respective stent 52 and 54 (as illustrated in FIGS. 3A-3B), functioning as a covering.
- the stent-graft 50 illustrated in FIG. 3Ais juxtaposed or extends across a bifurcation in an artery or vein.
- the straight bifurcated stent-graft 52is deployed such that the stent bifurcation 70 is placed near or adjacent the native vessel bifurcation.
- the first distal portion 58extends into one of the bifurcated branches of the native bifurcation, while the second distal portion 60 extends into the other bifurcated branch of the native bifurcation.
- the tapered stent-graft 54is positioned such that the distal portion 66 is placed in proximal portion 56 and in first distal portion 58 of straight bifurcated stent-graft 52 .
- Graft lining or covering 68 of tapered stent-graft 54defines a fluid passage that extends from proximal portion 56 of the straight bifurcated stent-graft 52 to first distal portion 58 of the straight bifurcated stent-graft 52 .
- bloodflows through the stent graft 50 exclusively to the bifurcated vessel branch of the native bifurcation that contains the first distal portion 58 , while blood is prevented from flowing through the stent-graft 50 to the other bifurcated branch of the native bifurcation that contains second distal portion 60 .
- second distal portion 60functions not as a fluid passageway, but as a structural member.
- the relationship among the first distal portion 58 , the stent bifurcation 70 , and the second distal portion 60allows the stent-graft 50 to straddle or span the native vessel bifurcation when deployed, placing the stent bifurcation 70 adjacent the native vessel bifurcation to prevent distal migration of the device.
- Contact between the stent bifurcation 70 and the native vessel bifurcationmay prevent stent-graft 50 from working its way down away from its originally deployed position.
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Abstract
Description
- The present invention relates to a one-branch stent-graft for use in bifurcated body lumens. More specifically, the present invention relates to a stent graft including two branches, wherein a closure prevents fluid from flowing to one of the branches.[0001]
- A stent-graft (a stent with a graft layer lining or covering it) is typically used to provide a prosthetic intraluminal wall, e.g., in the case of a stenosis or aneurysm, to provide an unobstructed conduit for blood in the area of the stenosis or aneurysm. A stent-graft may be endoluminally deployed in a body lumen, a blood vessel for example, at the site of a stenosis or aneurysm by so-called “minimally invasive techniques” in which the stent-graft is compressed radially inwards and is delivered by a catheter to the site where it is required, through the patient's skin, or by a “cut down” technique at a location where the blood vessel concerned is accessible. When the stent-graft is positioned at the correct location, the stent-graft is caused or allowed to re-expand to a predetermined diameter in the vessel.[0002]
- A one branch design stent-graft is typically utilized at a native vessel bifurcation to direct fluid into only one of the branches of the bifurcation. For example, an aorto-uni-iliac stent-graft provides an unobstructed conduit for blood to flow from the aorta through only one of the two iliacs. As used in the aorta, blood flows through the single branch stent-graft to the bifurcated vessel branch of the native bifurcation that contains the stent-graft, while blood is prevented from flowing to the other bifurcated branch of the native bifurcation.[0003]
- Typical single branch design stent-grafts have a tendency to work their way distally from the originally deployed position. It will be appreciated by a person skilled in the art that it is desirable to prevent stents from migrating out of position. In particular, where the site of desired application of the stent or prosthesis is a native vessel bifurcation, the distal migration associated with the use of the prior art prostheses constitutes a significant disadvantage.[0004]
- A stent-graft of this invention includes a bifurcated stent, i.e., an unbifurcated portion in fluid communication with two branches. The stent-graft further includes a graft that lines or covers at least part of the bifurcated stent. The graft of this stent graft defines a fluid passageway from the unbifurcated portion into one of the bifurcated stent branches. A closure, which may be part of the graft, prevents fluid from flowing to the other of the branches. The stent-graft is preferably adapted for placement of the stent bifurcation adjacent the native bifurcation of a body lumen to resist distal migration of the stent-graft. One use of such stent-grafts is in bypassing abdominal aortic aneurysms where a femoral-femoral bypass is surgically installed to provide blood flow to the occluded iliac.[0005]
- According to one aspect of this invention, a stent-graft is provided that is adapted for placement at a native vessel bifurcation. The stent-graft includes a bifurcated stent with a proximal portion adapted for placement in an unbifurcated region of the native bifurcation. As used herein, the term “proximal” means the unbifurcated end of the stent or stent-graft, i.e., nearest to the heart when the bifurcated lumen is the abdominal aorta, and the term “distal” means the opposite, i.e., the bifurcated end of the stent or stent-graft. The bifurcated stent further includes two distal portions. The first distal portion is adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation. The second distal portion extends toward and into the other bifurcated branch of the native bifurcation. A graft lining defines a fluid passage that extends from the proximal portion of the bifurcated stent to the first distal portion of the bifurcated stent. The graft lining is closed to the other of the bifurcated branches.[0006]
- According to yet another aspect of this invention, a stent-graft adapted for placement at a native vessel bifurcation includes a bifurcated stent with a proximal portion adapted for placement in an unbifurcated region of the native bifurcation. The bifurcated stent further includes two distal portions. The first distal portion is adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation. The second distal portion extends toward and into the other bifurcated branch of the native bifurcation. A graft lining or covering defines a fluid passage that extends from the proximal portion of the bifurcated stent to the distal portions of the bifurcated stent. An occluder device is adapted for placement in the second distal portion. The occluder prevents fluid passage through the second distal portion of the bifurcated stent-graft and to the second branch of the bifurcated lumen.[0007]
- According to another aspect of this invention, a stent-graft is provided that is adapted for placement at a native vessel bifurcation. The stent-graft includes a straight bifurcated stent-graft and a tapered stent-graft. The straight bifurcated stent-graft includes a proximal portion adapted for placement in an unbifurcated region of the native bifurcation, and two distal portions. The first distal portion is adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation. The second distal portion extends toward and into the other bifurcated branch of the native bifurcation. A graft lining or covering extends from the proximal portion of the straight bifurcated stent-graft to the distal portions of the straight bifurcated stent-graft. The tapered stent-graft includes a proximal tapered portion and a distal portion. The proximal portion is adapted for placement in the unbifurcated portion of the straight stent-graft and the distal portion is adapted for placement in the first distal portion of the straight stent-graft. A graft lining or covering extends from the proximal portion of the tapered stent-graft to the distal portion of the tapered stent-graft. The tapered stent-graft defines a fluid passage to the first distal portion of the straight bifurcated stent-graft, and is closed to fluid passage into the second distal portion of the straight bifurcated stent-graft by the graft lining or covering of the tapered stent-graft.[0008]
- The aspects, features, and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the accompanying drawings, in which:[0009]
- FIG. 1A is a front view of a stent-graft including a bifurcated stent and a graft lining in accordance with one embodiment of the present invention;[0010]
- FIG. 1B is a detail view of the bifurcated stent of FIG. 1A;[0011]
- FIG. 1C is a detail view of the graft lining of FIG. 1A;[0012]
- FIG. 2A is a front view of a stent-graft including a bifurcated stent, a graft lining, and an occluder device in accordance with another embodiment of the present invention;[0013]
- FIG. 2B is a detail view of the bifurcated stent of FIG. 2A;[0014]
- FIG. 2C is a detail view of the graft lining of FIG. 2A;[0015]
- FIG. 2D is a detail view of the occluder device of FIG. 2A;[0016]
- FIG. 3A is a front view of a stent-graft including a straight bifurcated stent and graft and a tapered stent and graft in accordance with yet another embodiment of the present invention;[0017]
- FIG. 3B is a detail view of the straight bifurcated stent and graft of FIG. 3A; and[0018]
- FIG. 3C is a detail view of the tapered stent and graft of FIG. 3A.[0019]
- Although the invention is illustrated and described herein with reference to specific embodiments, the invention is not intended to be limited to the details shown. Rather, various modifications may be made in the details within the scope and range of equivalents of the claims and without departing from the true spirit and scope of the present invention.[0020]
- Referring specifically to FIGS. 1A-1C, there is shown a stent-[0021]
graft 10 is adapted for placement at a native vessel bifurcation. The stent-graft 10 includes abifurcated stent 12 with aproximal portion 14 adapted for placement in an unbifurcated region of the native bifurcation. Thebifurcated stent 12 further includes twodistal portions distal portion 16 is adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation. The seconddistal portion 18 extends toward the other bifurcated branch of the native bifurcation. A graft lining20 defines a fluid passage that extends from theproximal portion 14 of thebifurcated stent 12 to thedistal portion 16 of thebifurcated stent 12. Thegraft lining 20 is adapted to extend to one of the bifurcated branches of the native bifurcation, but is closed to the other of the bifurcated branches. The stent-graft 10 is adapted for placement of thestent bifurcation 22 adjacent the native bifurcation. - FIG. 1B is a detail view of the[0022]
bifurcated stent 12 illustrated in FIG. 1A. Typically, thebifurcated stent 12 has a radially compressed configuration for introduction into a lumen, and a radially expanded configuration for deployment within the lumen. In other words, thebifurcated stent 12 is compressed radially inwards and is delivered by a catheter to the site where it is required through the patient's skin, or by a “cut down” technique in which the blood vessel concerned is exposed by minor surgical means at an accessible location thereof. When thestent 12 is positioned at the correct location, thestent 12 is caused or allowed to re-expand to a predetermined diameter in the vessel and the catheter is withdrawn. - FIG. 1C is a detail view of the graft lining[0023]20 illustrated in FIG. 1A. The
graft lining 20 is attached to an inside surface of the bifurcated stent12 (as illustrated in FIG. 1A) by sewing, suturing, or bonding. - In use, the stent-[0024]
graft 10 illustrated in FIG. 1A is juxtaposed or extends across a bifurcation in an artery or vein such as, for example, the bifurcation in the mammalian aortic artery into the common iliac arteries. Such bifurcation is referred to throughout this specification as a native vessel bifurcation. In the case of an abdominal aortic aneurysm (“AAA”) in the infrarenal portion of the aorta, which extends into one of the common iliac arteries, the stent-graft 10 is deployed such that thestent bifurcation 22 is placed adjacent the native vessel bifurcation. The firstdistal portion 16 extends into one of the bifurcated branches of the native bifurcation, while the seconddistal portion 18 extends toward and into the other bifurcated branch of the native bifurcation. The tapered shape of the graft lining20 results in a fluid passage that extends from theproximal portion 14 of thebifurcated stent 12 to the firstdistal portion 16 of thebifurcated stent 12. In other words, blood flows through the stent-graft 10 to the bifurcated vessel branch of the native bifurcation that contains the firstdistal portion 16, while blood is prevented from flowing through the stent-graft 10 to the other bifurcated branch of the native bifurcation that contains the seconddistal portion 18. - Accordingly, the second[0025]
distal portion 18 functions not as a fluid passageway, but as a structural member. The relationship among the firstdistal portion 16, thestent bifurcation 22, and the seconddistal portion 18, allows thestent graft 10 to straddle or span the native vessel bifurcation when deployed, placing thestent bifurcation 22 adjacent the native vessel bifurcation tending to prevent distal migration. Actual contact between thestent bifurcation 22 and the native vessel bifurcation may prevent the stent-graft 10 from working its way down away from its originally deployed position. - In this and other embodiments of the present invention, the stent and graft, respectively, may be formed of conventional materials, such as nitinol and ePTFE.[0026]
- Referring to FIGS. 2A-2D, there is shown another stent-[0027]
graft 30, adapted for placement at a native vessel bifurcation, includes abifurcated stent 32 with aproximal portion 34 adapted for placement in an unbifurcated region of the native bifurcation. Thebifurcated stent 32 further includes twodistal portions distal portion 36 is adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation. The seconddistal portion 38 extends toward and into the other bifurcated branch of the native bifurcation. A graft lining or covering40 (graft covering40 is represented in FIG. 2A) defines a fluid passage that extends from theproximal portion 34 of thebifurcated stent 32 to thedistal portions bifurcated stent 32. Anoccluder device 42 is adapted for placement in the seconddistal portion 38. Theoccluder 42 prevents fluid passage through the seconddistal portion 38 and to one of the bifurcated branches of the native bifurcation. The stent-graft 30 is adapted for placement of thestent bifurcation 44 adjacent the native bifurcation. - FIG. 2B is a detail view of the[0028]
bifurcated stent 32 illustrated in FIG. 2A. Thebifurcated stent 32 has a radially compressed configuration for introduction into a lumen, and a radially expanded configuration for deployment within the lumen. In other words, thebifurcated stent 32 is compressed radially inwards and is delivered by a catheter to the site where it is required through the patient's skin, or by a “cut down” technique in which the blood vessel concerned is exposed by minor surgical means. When thestent 32 is positioned at the correct location, thestent 32 is caused or allowed to re-expand to a predetermined diameter in the vessel. - FIG. 2C is a detail view of the graft lining or covering[0029]40 illustrated in FIG. 2A. The graft lining or covering40 may be attached to an inside surface of the
bifurcated stent 32, functioning as a lining. Alternatively, the graft lining or covering40 may be attached to an outside surface of the bifurcated stent32 (as illustrated in FIG. 2A), functioning as a covering. - FIG. 2D is a detail view of one form of occluder useful in combination with[0030]
stent graft 30. Specifically shown is anoccluder device 42 comprising a closed, straight stent-graft, typically adapted for endoluminal delivery into the seconddistal portion 38 of thebifurcated stent 32 after the stent-graft 30 has been deployed and expanded. Similar to thebifurcated stent 32,occluder device 42 has a radially compressed configuration for introduction into a lumen, and a radially expanded configuration for deployment within the lumen.Occluder device 42 includes astent 43 and agraft 44, either lining or covering part or all of stent43 (as illustrated in FIGS. 2A and 2D).Graft 43, however, is closed at one end to occlude fluid flow through theoccluder device 42 and thus through the seconddistal portion 38 of the stent-graft 30. - In use, stent-[0031]
graft 30 is juxtaposed or extends across a bifurcation in an artery or vein. Bifurcatedstent 32 is deployed such thatstent bifurcation 44 is placed near or adjacent the native vessel bifurcation. Firstdistal portion 36 extends into one of the bifurcated branches of the native bifurcation, while the seconddistal portion 38 extends toward and into the other bifurcated branch of the native bifurcation. After stent-graft 30 has been deployed and expanded,occluder device 42 is placed in the seconddistal portion 38 of thebifurcated stent 32, so thatgraft 43 defines a closed fluid passage, by whichoccluder device 42 prevents fluid from flowing through seconddistal portion 38 ofbifurcated stent 32. Such a configuration results in a fluid passage that extends fromproximal portion 34 ofbifurcated stent 32 to firstdistal portion 36 ofbifurcated stent 32. In other words, blood flows through the stent-graft 30 to the bifurcated vessel branch of the native bifurcation that contains the firstdistal portion 36, while blood is prevented from flowing through stent-graft 30 to the other bifurcated branch of the native bifurcation that contains seconddistal portion 38. - Accordingly, second[0032]
distal portion 38 ofstent 34 functions not as a fluid passageway, but as a structural member. The relationship among the firstdistal portion 36, thestent bifurcation 44, and the seconddistal portion 38, allows stent-graft 30 to straddle or span the native vessel bifurcation when deployed, placing thestent bifurcation 44 adjacent the native vessel bifurcation. Such a configuration tends to resist distal migration. Preferably, contact between thestent bifurcation 44 and the native vessel bifurcation prevents the stent-graft 30 from working its way down away from its originally deployed position. - Referring to FIGS. 3A-3C, there is shown a stent-[0033]
graft 50 adapted for placement at a native vessel bifurcation. Stent-graft 50 includes a straight bifurcated stent-graft 52 and a tapered stent-graft 54. Straight bifurcated stent-graft 52 includes aproximal portion 56 adapted for placement in an unbifurcated region of the native bifurcation, and twodistal portions distal portion 58 is adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation.Second bifurcation 60 extends toward and into the other bifurcated branch of the native bifurcation. A graft lining or covering62 (graft covering62 is represented in FIG. 3B) extends fromproximal portion 56 of straight bifurcated stent-graft 52 todistal portions graft 52. Tapered stent-graft 54 includes a proximal taperedportion 64 and adistal portion 66.Distal portion 66 is adapted for placement, after the straight stent-graft 52 has been deployed and expanded, inproximal portion 56 and firstdistal portion 58 of straight bifurcated stent-graft 52. A graft lining or covering68 (graft covering68 is represented in FIG. 3A) extends fromproximal portion 64 of the tapered stent-graft 54 todistal portion 66 of tapered stent-graft 54. Tapered stent-graft 54 defines a closed fluid passage to firstdistal portion 58 of straight bifurcated stent-graft 52, and is closed to fluid passage into seconddistal portion 60 of straight bifurcated stent-graft 52. - FIGS. 3B and 3C are detail views of the straight bifurcated stent-[0034]
graft 52 and the tapered stent-graft 54, respectively, illustrated in FIG. 3A. Both stent-grafts grafts grafts grafts - Graft linings or[0035]
coverings respective stent coverings respective stent 52 and54 (as illustrated in FIGS. 3A-3B), functioning as a covering. - In use, the stent-[0036]
graft 50 illustrated in FIG. 3A is juxtaposed or extends across a bifurcation in an artery or vein. The straight bifurcated stent-graft 52 is deployed such that thestent bifurcation 70 is placed near or adjacent the native vessel bifurcation. The firstdistal portion 58 extends into one of the bifurcated branches of the native bifurcation, while the seconddistal portion 60 extends into the other bifurcated branch of the native bifurcation. The tapered stent-graft 54 is positioned such that thedistal portion 66 is placed inproximal portion 56 and in firstdistal portion 58 of straight bifurcated stent-graft 52. Graft lining or covering68 of tapered stent-graft 54 defines a fluid passage that extends fromproximal portion 56 of the straight bifurcated stent-graft 52 to firstdistal portion 58 of the straight bifurcated stent-graft 52. In other words, blood flows through thestent graft 50 exclusively to the bifurcated vessel branch of the native bifurcation that contains the firstdistal portion 58, while blood is prevented from flowing through the stent-graft 50 to the other bifurcated branch of the native bifurcation that contains seconddistal portion 60. - Accordingly, second[0037]
distal portion 60 functions not as a fluid passageway, but as a structural member. The relationship among the firstdistal portion 58, thestent bifurcation 70, and the seconddistal portion 60, allows the stent-graft 50 to straddle or span the native vessel bifurcation when deployed, placing thestent bifurcation 70 adjacent the native vessel bifurcation to prevent distal migration of the device. Contact between thestent bifurcation 70 and the native vessel bifurcation may prevent stent-graft 50 from working its way down away from its originally deployed position. - While certain embodiments of the invention have been shown and described herein, it will be understood that such embodiments are provided by way of example only. Other embodiments may be devised by those skilled in the art utilizing the essential novelty of the invention as disclosed herein. It is intended that the appended claims be construed to include all such embodiments, whether or not disclosed herein.[0038]
Claims (19)
1. A stent-graft for bypassing one branch of a bifurcated body lumen comprising:
a bifurcated stent, wherein said stent includes an unbifurcated portion and two branches extending therefrom, and is adapted for placement with the bifurcation of the stent adjacent the bifurcation of the body lumen and the two branches extending into the branches of the bifurcated body lumen;
a graft lining or covering at least part of said bifurcated stent and defining a fluid passageway from said unbifurcated portion into one of said bifurcated stent branches; and
a closure preventing fluid from flowing to the other of said branches.
2. The stent-graft recited inclaim 1 , wherein said closure comprises a portion of said graft lining or covering.
3. The stent-graft recited inclaim 1 , wherein said closure is an occluder device placed in said second branch of said bifurcated stent.
4. The stent-graft recited inclaim 3 , wherein said occluder device is a second stent-graft.
5. The stent-graft recited inclaim 4 , wherein said second stent-graft includes a graft covering or lining said second stent-graft and closed at one end thereof.
6. The stent-graft recited inclaim 1 , wherein said closure is a second stent-graft placed in said unbifurcated portion of said bifurcated stent and extending into only one branch of said bifurcated stent.
7. A bifurcated stent-graft, adapted for placement at a native vessel bifurcation, comprising a bifurcated stent with:
a proximal portion adapted for placement in an unbifurcated region of the native bifurcation;
two distal portions, the first of which is adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation, the second of which extends toward and into the other bifurcated branch of the native bifurcation; and
a graft lining or covering defining a fluid passage which extends from said proximal portion of said bifurcated stent to said distal portion of said bifurcated stent, wherein said graft lining is adapted to extend to one of the bifurcated branches of the native bifurcation, but is closed to the other of the bifurcated branches,
said stent-graft adapted for placement of said stent bifurcation adjacent the native bifurcation.
8. The stent-graft recited inclaim 7 , wherein said graft lining is attached to an inside surface of said stent by sewing or suturing.
9. The stent-graft recited inclaim 7 , wherein said graft covering is attached to an outside surface of said stent by sewing or suturing.
10. The stent-graft recited inclaim 7 , wherein said graft lining is attached to an inside surface of said stent by bonding.
11. The stent-graft recited inclaim 7 , wherein said graft covering is attached to an outside surface of said stent by bonding.
12. The stent-graft recited inclaim 7 , wherein said bifurcated stent has a radially compressed configuration for introduction into a lumen and a radially expanded configuration for deployment within the lumen.
13. A stent-graft, adapted for placement at a native vessel bifurcation, comprising a bifurcated stent with:
a proximal portion adapted for placement in an unbifurcated region of the native bifurcation;
two distal portions, the first of which is adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation, the second of which extends toward the other bifurcated branch of the native bifurcation;
a graft lining or covering defining a fluid passage which extends from said proximal portion of said bifurcated stent to said distal portions of said bifurcated stent; and
an occluder device adapted for placement in said second distal portion, wherein said occluder prevents fluid passage through said first distal portion and to one of the bifurcated branches of the native bifurcation,
said stent-graft adapted for placement of said stent bifurcation adjacent the native bifurcation.
14. The stent-graft recited inclaim 13 , wherein said occluder device comprises a closed, straight stent-graft.
15. The stent-graft recited inclaim 13 , wherein said bifurcated stent has a radially compressed configuration for introduction into a lumen and a radially expanded configuration for deployment within the lumen.
16. The stent-graft recited inclaim 13 , wherein said occluder device has a radially compressed configuration for introduction into a lumen and a radially expanded configuration for deployment within the lumen.
17. A stent-graft, adapted for placement at a native vessel bifurcation, comprising:
a straight bifurcated stent including,
a proximal portion adapted for placement in an unbifurcated region of the native bifurcation,
two distal portions, the first of which is adapted to extend from the unbifurcated region of the native bifurcation into one of the bifurcated branches of the native bifurcation, the second of which extends toward the other bifurcated branch of the native bifurcation, and
a graft lining or covering which extends from said proximal portion of said straight bifurcated stent to said distal portions of said straight bifurcated stent; and
a tapered stent including,
a proximal tapered portion adapted for placement in said proximal portion of said straight bifurcated stent,
a distal portion adapted for placement in said first distal portion of said straight bifurcated stent, and
a graft lining or covering which extends from said proximal portion of said tapered stent to said distal portion of said tapered stent,
wherein said tapered stent defines a fluid passage to said first distal portion of said straight bifurcated stent, and is closed to fluid passage into said second distal portion of said straight bifurcated stent.
18. The stent-graft recited inclaim 17 , wherein said straight bifurcated stent has a radially compressed configuration for introduction into a lumen and a radially expanded configuration for deployment within the lumen.
19. The stent graft recited inclaim 17 , wherein said tapered stent has a radially compressed configuration for introduction into a lumen and a radially expanded configuration for deployment within the lumen.
Priority Applications (7)
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|---|---|---|---|
| US10/461,898US20040254628A1 (en) | 2003-06-13 | 2003-06-13 | One-branch stent-graft for bifurcated lumens |
| CA2529008ACA2529008C (en) | 2003-06-13 | 2004-05-18 | One-branch stent-graft for bifurcated lumens |
| AT04752443TATE519450T1 (en) | 2003-06-13 | 2004-05-18 | STENT GRAFT WITH A BRANCH FOR BRANCH LUMEN |
| EP04752443AEP1633282B1 (en) | 2003-06-13 | 2004-05-18 | One-branch stent-graft for bifurcated lumens |
| JP2006533145AJP4729498B2 (en) | 2003-06-13 | 2004-05-18 | Bifurcated one-branch stent graft |
| PCT/US2004/015428WO2005000166A1 (en) | 2003-06-13 | 2004-05-18 | One-branch stent-graft for bifurcated lumens |
| US10/963,354US7491231B2 (en) | 2003-06-13 | 2004-10-12 | One-branch stent-graft for bifurcated lumens |
Applications Claiming Priority (1)
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| US10/461,898US20040254628A1 (en) | 2003-06-13 | 2003-06-13 | One-branch stent-graft for bifurcated lumens |
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| US10/963,354DivisionUS7491231B2 (en) | 2003-06-13 | 2004-10-12 | One-branch stent-graft for bifurcated lumens |
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| US10/963,354Expired - Fee RelatedUS7491231B2 (en) | 2003-06-13 | 2004-10-12 | One-branch stent-graft for bifurcated lumens |
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| EP (1) | EP1633282B1 (en) |
| JP (1) | JP4729498B2 (en) |
| AT (1) | ATE519450T1 (en) |
| CA (1) | CA2529008C (en) |
| WO (1) | WO2005000166A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP1633282A1 (en) | 2006-03-15 |
| CA2529008A1 (en) | 2005-01-06 |
| JP4729498B2 (en) | 2011-07-20 |
| US7491231B2 (en) | 2009-02-17 |
| CA2529008C (en) | 2013-08-20 |
| WO2005000166A1 (en) | 2005-01-06 |
| EP1633282B1 (en) | 2011-08-10 |
| JP2007502196A (en) | 2007-02-08 |
| US20050049676A1 (en) | 2005-03-03 |
| ATE519450T1 (en) | 2011-08-15 |
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