CA2052981C - Percutaneous stent assembly - Google Patents

Percutaneous stent assembly

Info

Publication number
CA2052981C
CA2052981C CA002052981A CA2052981A CA2052981C CA 2052981 C CA2052981 C CA 2052981C CA 002052981 A CA002052981 A CA 002052981A CA 2052981 A CA2052981 A CA 2052981A CA 2052981 C CA2052981 C CA 2052981C
Authority
CA
Canada
Prior art keywords
stent
stents
sleeve
flexible sleeve
stent assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CA002052981A
Other languages
French (fr)
Inventor
Cesare Gianturco
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cook Inc
Original Assignee
Cook Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Cook Inc filed Critical Cook Inc
Application granted granted Critical
Publication of CA2052981C publication Critical patent/CA2052981C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • A61F2/82—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
    • 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
    • A61F2/89—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
    • 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
    • A61F2002/072—Encapsulated stents, e.g. wire or whole stent embedded in lining
    • 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
    • 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
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30461—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements sutured, ligatured or stitched
    • 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
    • A61F2002/825—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents having longitudinal struts
    • 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
    • A61F2002/828—Means for connecting a plurality of stents allowing flexibility of the whole 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
    • 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
    • A61F2220/005—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements using adhesives
    • 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
    • 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
    • A61F2220/0058—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements soldered or brazed or welded
    • 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
    • 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 self-expanding stent assembly consisting of one or more Z-stents connected to one another and covered by a flexible sleeve, which can be made from either nylon, plastic or another suitable material. The stents are formed of stainless steel wire arranged in a closed zig-zag configuration which includes an endless series of struts that are joined by an equal number of joints. The stent assembly is compressible into a reduced diameter size for insertion into, and possible removal from, a body passageway. After being properly positioned within a body passageway, the stent assembly is allowed to expand to its larger diameter shape, wherein the sleeve is pressed against the walls of the passageway by the stents. One application of the invention includes dilating a biliary duct which has been occluded by a tumorous growth. The advantage being that the sleeve prevents the tumor from growing between the gaps created by the stent which would otherwise restenose the passageway.
Another intended application is to repair aneurysms. In this configuration, the stents are postioned on either side of an aneurysm, and the sleeve forms and artificial arterial wall which spans the aneurysm.

Description

PERCUTAN~OUS STENT ~SSEMBLY ~OS~81 BACKGROUND OF THE INVENTION

Field of the Invention:
This invention relates generally to vascular stents for use in preventing restenosis of passageways and ducts in the body and to repair aneurysms percutaneously.
Description of the Prior Art:
It is desirable that means be provided which will prevent the restenosis of a passage or duct due to the invasion of tissue between the wire struts of the stent. Such a situation often occurs where a tumor has invaded a biliary tract. In those cases, a wire stent tends to provide only temporary relief from occlusion because the tumor often tends to grow between the wire struts, eventually resulting in a restenosed passageway. Gianturco U.S. Pat. No. 4,580,568 exemplifies such conventional wire stents. While Gianturco '568 discloses a wire stent to reduce flow defects in arteries, ducts and the like within the body, it does not solve the problem of tissue growth between the wire struts of the stent. Thus, conventional wire stents do not necessarily provide an acceptable long-term solution in the face of malignant tissue growth, nor do such stents provide a means to repair aneurysms percutaneously. ~ b Reference is also made to U.S. Patent ~pp~ica~ion ,'DQrial ~o. ~22,G0~, also by Gianturco. That application teaches a stent structure and method which permits a stent to be easily retrieved from the body percutaneously, some time after being successfully implanted. In many instances, such an advantage would be suitable to the present invention.
There remains a need for a percutaneous stent assembly that is self-expanding, yet is capable of preventing or reducing restenosis. There is also need for a percutaneous stent assembly which is capable of repairing aneurysms.

SUMMARY OF THE INVENTION
One embodiment of the stent assembly of the present invention mlght lnclude a flexlble sleeve which is open at both ends. Attached to the flexlble sleeve are one or more reslllently compresslble stents. ~ach stent lncludes a plurallty of struts whlch define a series of gaps therebetween. The stents are attached to the flexlble sleeve such that the gaps deflned by the stents are substantlally covered by the sleeve. Because the sleeve ls flexlble, the percutaneous sleeved stent assembly is capable of elastically assumlng a smaller first shape when compressed and a larger second shape when allowed to expand. The smaller first shape allows the assembly to be passed percutaneously through a lumen into a passageway wlthin the body. Upon implantatlon, the sleeved stent assembly ls allowed to expand to assume the second larger shape whereln the flexlble sleeve ls pressed against the walls of the passageway by the stents to malntaln the passageway open.
One ob~ect of the present invention is to provide an improved percutaneous stent assembly.
In accordance with the present invention, there is provided a percutaneous stent assembly comprising:
a flexible sleeve having an inner surface and an outer surface and being open at both ends;
at least one resiliently compressible stent, each said stent including a plurality of struts defining a series of gaps between said struts;

means for attaching said stents to said flexible sleeve such that said gaps defined by each sald stent are - substantially covered by said flexible sleeve;
means for rendering said percutaneous stent assembly resistant to contraction along the axis defined by said flexible sleeve when the stent assembly ls radlally compressed into a smaller flrst shape and being axially pushed into position ad~acent a stenosis in a passageway of the patient;
wherein said percutaneous stent assembly defines said smaller flrst shape when radlally compressed and reslliently defines a larger second shape when allowed to radlally expand;
said flexible sleeve is made of nylon; and said means for attaching said stents to said flexible sleeve consists of a plurality of stitches.
In accordance with the present lnvention, there ls further provided a percutaneous stent assembly comprising:
a flexible sleeve having an lnner surface and an outer surface and being open at both ends;
at least one resiliently compresslble stent, each said stent including a plurallty of struts defining a series of gaps between said struts;
means for attaching said stents to said flexible sleeve such that sald gaps defined by each said stent are substantially covered by said flexible sleeve;
means for rendering said percutaneous stent assembly resistant to contraction along the axis defined by - 2a --.

-said flexible sleeve when the stent assembly is radially compressed into a smaller flrst shape and belng axially pushed into posltlon adiacent a stenosis in a passageway of a patient;
wherein said percutaneous stent assembly defines sald smaller flrst shape when radially compressed and resiliently defines a larger second shape when allowed to radially expand;
said stent comprising at least two resiliently compresslble stents arranged end to end;
said means for rendering the stent assembly resistant to contraction along the axls deflned by sald sleeve includes lnterconnectlng adiacent ends of sald at least two stents together;
each sald end of each said stent includes a plurallty of eye portlons; and sald means for rendering the stent assembly reslstant to contractlon along the axls defined by said sleeve includes tying at least one of said plurallty of eye portions from each sald stent to an ad~acent sald eye portion of an ad~acent sald stent.
In accordance with the present invention, there is further provlded a percutaneous stent assembly comprislng:
a resiliently compresslble stent capable of belng radially compressed into a smaller first shape but reslllently radlally expandlng lnto a larger second shape when allowed to expand, sald stent having a plurallty of interconnected struts which define a series of gaps - 2b ~3 ~

~ 2052981 therebetween when sald stent is in said larger second shape;
a flexible sleeve having an inner surface, an outer surface and being open at both end; and means for attaching said stent to said flexlble sleeve such that said gaps defined by each said stent are substantlally covered by sald flexible sleeve;
a second stent substantially ldentical to said first stent and being interconnected end-to-end with sald flrst stent;
said flexible sleeve extends to cover said second stent; and said sleeve is formed from a flexible plastic material and sald stents are embedded ln sald plastlc.
Related ob~ects and advantages of the present lnventlon will be apparent from the followlng descriptlon.

- 2c ~..
2~S;~38~

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectioned side elevation of a preferred embodiment of the present invention.
FIG. lA is a detail of a junction between two struts of the stent portion of the embodiment shown in FIG. 1.
FIG. lB is a side elevation of the embodiment shown in FIG. 1 in its compressed smaller shape for implantation in the body.
FIG. 2 is an end elevation of a preferred embodiment of the present invention.
FIG. 3 is a section through a biliary duct showing a tumor growth which has partially occluded the duct.
FIG. 4 shows the structure of FIGS. 1, lB and 2 during implantation into the biliary duct of FIG. 3.
FIG. 5 is a sectioned side elevation of the structure of FIG. 1 implanted in a biliary duct adjacent to the tumor.
FIG. 6 is a sectioned side elevation of anothe-r preferred embodiment of the present invention.
FIG. 7 is a sectioned side elevation of the structure of FIG. 4 implanted to span an aneurysm in an artery.

. ~. .
DESCRIPTION OF THE PREFERRED EMBODIMENTS
For the purposes of promotlng an understandlng of the prlnclples of the lnvention, reference will now be made to the embodiments lllustrated ln the drawings and speclflc language wlll be used to describe the same. It will nevertheless be understood that no llmltatlon of the scope of the lnvention ls thereby intended, such alteratlons and further modlficatlons ln the lllustrated devlce, and such further applicatlons of the prlnclples of the lnventlon as lllustrated thereln belng contemplated as would normally occur to one skllled ln the art to whlch the invention relates.
Referring now more particularly to the drawlngs, there ls lllustrated ln FIG. 1 a sectioned side elevation of a preferred embodlment of the percutaneous stent assembly 10 of the present lnventlon whlch includes two stents, 11 and 12 respectlvely, surrounded by a flexlble sleeve 13 whlch ls open at both ends thereof. Stents 11 and 12 are formed from a length of stalnless steel wlre formed ln a closed zlg-zag configuration. The ends of the wire can be closed in a variety of ways, lncludlng the use of a sleeve whlch ls welded or tlghtly plnched against the ends of the wire to produce a continuous or endless configuration. Each stent 11 and 12 comprises a plurality of struts 14 connected to one another by a series of ~olnts 15 and 17, which are better lllustrated in FIG. lA. In most respects, stents 11 and 12 are similar to the Z-stent described in U.S. Patent No.
4,580,568 (Gianturco '568). Each ioint 15 and 17 deflnes an eye 18, whlch can be shaped by bendlng the wlre to form a cusp , ,i9 ~
., a~d, then, welding or soldering the wlre back upon itself.
Each serial pair of struts 14 defines a gap 16 therebetween.
The stents 11 and 12 are attached to sleeve 13, which in this case is nylon, by stitching or gluing the ~oints 17 at either end of the stent assembly to the sleeve 13. If the sleeve were made of plastic, the stents could be attached to the sleeve by embeddlng the stents in the plastic, it being understood that the means for attaching the stents to the sleeve can be varied depending on the sleeve material, and other factors, without diverging from the intended scope of the present invention.
The stent assembly resists contraction, or prevents overlapping of the stents 11 and 12, along the axis defined by sleeve 13 by serlally tylng eyes 18 at ~oints 15 with thread 20. Thread 20 belng preferably a monofilament of bio-compatible materlal. The stent assembly must be able to reslst contraction along lts axls ln order to be properly implanted and to avold entangling the stents while in the compressed smaller shape. FIG. 1~ shows a side elevation of percutaneous stent assembly 10 when compressed into its smaller first shape which facilitates implantation in the body. The same contraction resistant result can also be accomplished by directly connecting ioints 15 through a variety of means, lncluding welding, stitching or by utilizing interlocking eyes as disclosed in U.S. Patent 5,035,766.
FIG. 3 shows a section of a biliary duct which is nearly occluded by the presence of a growth in the nature of a ~., turr~our and or stenosis. While a conventional wire stent could be successfully lmplanted to redilate the openlng ln the duct, it would render only a temporary solution because the tumour and or stenosis would continue to grow between the struts of the stent, eventually resulting in a restenosed passageway in as little as a few weeks. The sleeve included in the present invention avoids this problem. FIG. 4 shows the compressed stent assembly 10 during implantation in the occluded duct of FIG. 3. As described in Gianturco '568 (col. 3, lines 5-18), the stent assembly 10 is pushed through a sheath 23 to the desired point in the body by flat-ended pusher 24, while in its - 5a -compressed first shape. After arriving at the proper location, the sheath 23 is withdrawn, and the stent assembly 10 resiliently assumes its larger second shape, as illustrated in FIG. 5. The sleeve 13 prevents the tumor from growing between the struts of the stent, thus avoiding restenosis and affording a longer term solution than that possible with conventional wire stents.
Another preferred embodiment of the present invention, which is particularly suited for repairing aneurysms percutaneously, is illustrated in FIG. 6. The percutaneous stent assembly 50 includes resiliently expandable stents 51 and 52, rigid support rod 52 and nylon sleeve 54. Stents 51 and 52 are generally identical to stents 11 and 12 described earlier. The stents 51 and 52 are attached to sleeve 54 by stitching or gluing the joints 55, which are located at either end of the assembly, to the inner surface 56 of the sleeve.
During implantation, the rigid support rod 53 prevents the percutaneous stent assembly 50 from collapsing on itself along the axis defined by sleeve 54. This embodiment is implanted at the desired point in the body as described earlier for the previous embodiment. FIG. 7 shows stent assembly 50 after being implanted in an artery having an aneurysm. The stent assembly is secured in place when stents 51 and 52 press the sleeve 54 against the undamaged walls of the artery located on either side of the aneurysm. The sleeve 54 then forms an artificial arterial wall that spans the aneurysm. This removes pressure from the aneurysm, allowing it to heal.
While the invention has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only the preferred embodiment has been shown and described and that all changes and modifications that come within the spirit of the invention are desired to be protected.

Claims (6)

1. A percutaneous stent assembly comprising:
a flexible sleeve having an inner surface and an outer surface and being open at both ends;
at least one resiliently compressible stent, each said stent including a plurality of struts defining a series of gaps between said struts;
means for attaching said stents to said flexible sleeve such that said gaps defined by each said stent are substantially covered by said flexible sleeve;
means for rendering said percutaneous stent assembly resistant to contraction along the axis defined by said flexible sleeve when the stent assembly is radially compressed into a smaller first shape and being axially pushed into position adjacent a stenosis in a passageway of a patient;
wherein said percutaneous stent assembly defines said smaller first shape when radially compresed and resiliently defines a larger second shape when allowed to radially expand;
said flexible sleeve is made of nylon; and said means for attaching said stents to said flexible sleeve consists of a plurality of stitches.
2. A percutaneous stent assembly comprising:
a flexible sleeve having an inner surface and an outer surface and being open at both ends;
at least one resiliently compressible stent, each said stent including a plurality of struts defining a series of gaps between said struts;

means for attaching said stents to said flexible sleeve such that said gaps defined by each said stent are substantially covered by said flexible sleeve;
means for rendering said precutaneous stent assembly resistant to contraction along the axis defined by said flexible sleeve when the stent assembly is radially compressed into a smaller first shape and being axially pushed into position adjacent a stenosis in a passageway of a patient;
wherein said percutaneous stent assembly defines said smaller first shape when radially compressed and resiliently defines a larger second shape when allowed to radially expand;
said stent comprising at least two resiliently compressible stents arranged end to end;
said means for rendering the stent assembly resistant to contraction along the axis defined by said sleeve includes interconnecting adjacent ends of said at least two stents together;
each said end of each said stent includes a plurality of eye portions; and said means for rendering the stent assembly resistant to contraction along the axis defined by said sleeve includes tieing at least one of said plurality of eye portions from each said stent to an adjacent said eye portion of an adjacent said stent.
3. The percutaneous stent assembly of claim 2 wherein said eye portions of each said stent are serially tied to said eye portions of an adjacent said stent.
4. A percutaneous stent assembly comprising:
a resiliently compressible stent capable of being radially compressed into a smaller first shape but resiliently radially expanding into a larger second shape when allowed to expand, said stent having a plurality of interconnected struts which define a series of gaps therebetween when said stent is in said larger second shape;
a flexible sleeve having an inner surface, an outer surface and being open at both ends; and means for attaching said stent to said flexible sleeve such that said gaps defined by each said stent are substantially covered by said flexible sleeve;
a second stent substantially identical to said first stent and being interconnected end-to-end with said first stent;
said flexible sleeve extends to cover said second stent; and said sleeve is formed from a flexible plastic material and said stents are embedded in said plastic.
5. The percutaneous stent assembly of claim 4 wherein said stents are tied end-to-end with a filament.
6. The percutaneous stent assembly of claim 5 wherein said sleeve is formed of nylon.
CA002052981A 1990-10-09 1991-10-08 Percutaneous stent assembly Expired - Lifetime CA2052981C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US59405090A 1990-10-09 1990-10-09
US07/594,050 1990-10-09

Publications (1)

Publication Number Publication Date
CA2052981C true CA2052981C (en) 1995-08-01

Family

ID=24377297

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DK0480667T3 (en) 1996-06-10
JPH04263852A (en) 1992-09-18
GR3019390T3 (en) 1996-06-30
ES2085435T3 (en) 1996-06-01
DE9116881U1 (en) 1994-07-07
DE69118083T2 (en) 1996-08-22
EP0480667A1 (en) 1992-04-15
US5282824A (en) 1994-02-01
DE69118083D1 (en) 1996-04-25
JPH0693920B2 (en) 1994-11-24
AU8568391A (en) 1992-06-11
AU633453B2 (en) 1993-01-28
DE9117152U1 (en) 1996-07-11
ATE135555T1 (en) 1996-04-15
EP0480667B1 (en) 1996-03-20

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