CA2007648C - Percutaneous stent and method for retrieval thereof - Google Patents

Percutaneous stent and method for retrieval thereof Download PDF

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Publication number
CA2007648C
CA2007648C CA002007648A CA2007648A CA2007648C CA 2007648 C CA2007648 C CA 2007648C CA 002007648 A CA002007648 A CA 002007648A CA 2007648 A CA2007648 A CA 2007648A CA 2007648 C CA2007648 C CA 2007648C
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Prior art keywords
stent
eyes
wire
bends
straight sections
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CA002007648A
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French (fr)
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CA2007648A1 (en
Inventor
Cesare Gianturco
Thomas A. Osborne
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Cook Inc
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Cook Inc
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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
    • A61F2/82—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
    • A61F2/82—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
    • A61F2/82—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
    • A61F2/95—Instruments specially adapted for placement or removal of stents or 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
    • A61F2/95—Instruments specially adapted for placement or removal of stents or stent-grafts
    • A61F2002/9505—Instruments specially adapted for placement or removal of stents or stent-grafts having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument
    • 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
    • A61F2002/9505—Instruments specially adapted for placement or removal of stents or stent-grafts having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument
    • A61F2002/9511—Instruments specially adapted for placement or removal of stents or stent-grafts having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument the retaining means being filaments or wires
    • 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
    • A61F2002/9528—Instruments specially adapted for placement or removal of stents or stent-grafts for retrieval of stents
    • 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

Abstract

A self-expanding stent formed of stainless steel wire arranged in a closed zig-zag configuration includes an endless series of straight sections joined at their ends by bends. The stent is compressible into a reduced diameter size for insertion into and removal from a body passageway.
The bends of at least one end of the stent are formed into eyes for connection with the eyes at one end of a similarly constructed stent to permit single-step introduction of several lengths of stent into the passageway. A stent can include a monofilament thread passing through successive eyes at one end of the stent, the thread passing through each eye at least once and through some of the eyes a second time. The trailing ends of the thread extend from the stent and outside the body passageway. The scent can be retrieved from the body passageway by threading a tube of the free ends of the thread until the tube is adjacent the stent.
The diameter at one end of the stent is reduced by pulling the free ends of the thread through the tube. A sheath concentrically disposed over the tube is introduced into the body passageway and over the remaining length of the stent to further compress the stent for removal from the passageway.

Description

_1_ PERCUTANEOUS S'TENT AND METHOD F'OR RETRIEVAL THEREOF
Ea ~~n..nd of the Invention This invention relates to stents and a method for retrieving stents after insertion into the body of a patient. In particular, the invention relates to modifications to the Gianturco Ezpandable Wire Stent.
It is desirable in various situations to provide means for ezpanding a constricted vessel portion or far maintaining an open passageway through a vessel portion.
Such situations arilse, for ezample. in conjunction with arteriosclerosis that restricts or stops blood flow through a vessel, or in conjunction with diseases of the prostrate gland which reatrica or stop flow through the urethra.
A percutaneous stent developed by Dr. Cesare Gianturco is farmed of a sta:lnless steel wire arranged in a closed, zig-zag pattern, a;s more fully described in U.S. Patent No.
4,580,568. The Gianturco stent, or the Z-scent as it is also known, is compressed into a reduced size shape with an outer diameter which is many times smaller its outer diameter in an eap~anded shape. The scent is positioned in a passageway by mean's of a sheath while the stent is retained in the compressed reduced sire shape. A pusher or flat-ended catheter is used through the sheath to hold the stent in place in the passageway while the sheath is withdrawn. thereby allowing the scent to expand in the passageway into its ezpanded shape to hold the passageway open and enlarged. Thus, the Z-scent provides a self-expanding means for maintaining an open passageway.
FIG. 1 illustrates the use of the well-known Z-stent wire within a body passageway.
FIG. 2 illustrates the use of several Z-stents along,a limited length of a body passageway. In illustrated arrangement, two stents are situated in an overlapping arrangement, whiles a third stent is disposed slightly downstream from the other two stents. Aa discussed more -Z_ fully in the above-referenced Gianturco '568 patent, each of the three stance moat be separately inserted using the sheath and pusher dlescribed above.
Since the initial development of the expandable wire Z-stent, ft has been discovered that over time a Z-atent may continue to expand to its maximum diameter even though it was originally deployed in a passageway that had a diameter somewhat smaller than the maximum outer diameter vf.the ezpanded scent. Thus, the end result has been in some cases that the scent becomes embedded deeply into the walls of the passageway. In an effort to address this particular problem, others in the art have modified the expendable Z-stent to form eyes at the bends or.joints of the zig-zag configuration. A mbnofilament line is then threaded through each of the eyes at one end of the scent to form, in essence, a continua~us flexible ring which restricts the expansion of the wire stent. The~monofilament line is sufficiently elastic in the tensile direction to control the expansion of the st.ent to an optimal desired diameter.
Further description of this modified expandable wire Z-stent is found in the following references:
Modi,/fed (~iantur~cc~ Expandable Wire Scents in Experimental and Cliniaxl Uae, J. Rosch, CIRBE, Forto Cervo, Sardinia, May 25-29, 1987, Vol 31-No. 2, 1988 Modifications of (~iantw~co Bag~andable Wine Stenta, Barry T. Crchida, AJR 150:1185-118'7, May 1988, American Ftoentgen Ray Society E~g~erimental Introhepatic Portacaual Anaatomoaia:
Use of Expandable Gianturco Stems. Josef Rosch, M. D. , RSNA, 1987, Volume 162 No. Z
Superior Versa Cave Syndrome Aasociatoad with Massive Thromboaie: Treatment with Expandable Wire Scents, RsNA, June 1988 Gianturco Expandable Wire Scents in the Treatment of Superior Vena Cava Syndrome Recurring After Maximum-Tolerance Radiation, Reprinted from CANCER, Vol. 60, No. 6, September 15, 1987.
There remains, however, a need for a percutaneous stent that is self-expanding, yet can be retrieved after a period of time of insertion. There is also need for a percutaneous stent that includes several stent sections for insertion along a greater length of a body passageway than has been permitted by expandable stents of the prior art. There is also a need for a stent capable of combination with multiple stent sections that does not require multiple catheterizations for insertion operations.
Summary of the Invention One embodiment of the self-expanding stent of the present invention includes a wire formed into a closed zig-zag configuration defining an endless series of straight sections joined by bends. At each or several of the bends is formed an eye which can be used for connection of another similarly constructed self-expanding stent, or for connection of a skirt stent of like construction. A number of self-expanding stents can be combined by joining the stents at the eyes. Each of the stents is resiliently compressible into a first smaller shape for insertion into a body passageway, such as through an introducer sheath. Once within the body passageway, the stents are resiliently expandable into a larger second shape wherein the straight sections press against the walls of the passageway to maintain it open.
Another embodiment of the invention involves a self-expanding stent of closed zig-zag configuration having eyes at bends joining the straight sections of the stent. A
monofilament thread is passed through each of the eyes at one end of the stent, once through each of the eyes in a 360° loop and then again 180° through some of the eyes. The trailing free ends of the monofilament leave the stmt at opposite sides of the stmt diameter and extend through an introducer sheath outside the body passageway. The monofilament can be tied externally to limit the expansion of the self-expanding stmt within the body passageway.
The free Ends of the monofilament can also be used to reduce the diameter of the stmt to permit retrieval of the stmt from the body passageway. Thus, in a method of the invention, a tube is threaded over the free ends of the monofilament and advanced along the passageway until the tube is adjacent the expanded stmt. The free ends are then pulled thereby contracting the outer diameter of the stmt until the diameter is approximately equal to the diameter of the tube. A
sheath can then be :introduced over the tube and over the reduced diameter portion of the stent to further collapse the remaining length of the stmt. The entire assembly, including the tube, sheath, stmt and monofilament can then be removed from the body passageway.
One object of the invention is to provide a self-expanding stmt that permits the combination of several interlocked stems for insertion into a body passageway.
Another object of.the invention is to provide a method for removal of a self-expanding stmt situated within a body 4a passageway. Other objects and benefits of the present invention can be discerned from the following written description of the invention along with the accompanying drawings.
In accordance with the present invention, there is provided a stmt assembly comprising: a first wire formed into a closed zig-zag configuration including; a series of straight sections having opposite ends, said straight sections being joined by bends at aaid opposite ends to form a stmt; a set of eyes formed at several of said bends at one of said opposite ends; and a thread passing through successive ones of said set of eyes, said thread including a pair of free ends trailing from said stent; wherein said stmt is resiliently contractable into a smaller first shape for conveyance through a body passageway;
and wherein said stmt is resiliently expandable into a second shape in which the .straight sections press against the walls of the body passageway.
In accordance with the present invention, there is also provided a method for combining a first and second self-expanding stmt to form a stent assembly for insertion into a body passageway comprising the steps of: forming a first stent from a first length of wire formed into a closed zig-zag configuration having a series of straight sections joined at their ends by a plurality of bends; forming a second stmt from 4b a second length of wire with opposing ends formed into a zig-zag configuration having a series of straight sections joined at their ends by a plurality of bends, the bends at one end forming eyes open at the straight sections of the second stent; engaging the eyes at the one end of the second stmt about bends at one end of the first st~~nt; closing the eyes at the one end of the second stent by joining the straight sections of the second stmt at the one end of the second stent to encircle the portion of the first wire passing therethrough; and attaching the opposing ends of the second length of wire to one another, said second length of wire thereby forming a closed zig-zag configuration.
Brief Description of the Drawings FIG. 1 is side cross-sectional view of a body passagway with a self-expanding wire stent of the prior art situated therein.
FIG. 2 is a view similar to FIG. 1 showing the use of several stems of the prior art within the body passageway.
FIG. 3 is. a side elevational view of a preferred embodiment of the present invention.

FIG. 9 ie an Band elevational view of the structure of FIG. 3.
FIG. 5 is a aide elevational view of another embodiment of the present invention.
FIG. 6 is a s9ide elevational view of another embodiment of the present invention.
FIG. 7A is a a:ids elevational view of still another embodiment of the present invention shown in its expanded state.
FIG. 78 is a side elevational view of the structure of FIG. 7A shown with one end in its contracted state.
FIG. a is a sectional view of a body passageway showing s method of inaert:ion of the self-expanding stent of the present invention.
FIG. 9 is a sectional view of the body passageway similar to FIG. 8 following insertion of the self-expanding stent.
FIG. l0A is a sectional view of the body passageway shown in FIG. 9 showing one step of a method of retrieval of ZO the self-expanding scent of one embodiment of the present invention.
FIG. 10H is a view similar to FIG. l0A showing another step of the method of retrieval.
FIG. lOC is a view similar to PIG. 108 showing another step of the method; of retrieval of the present invention.
Description of than prefwrrsd Lmbodimep~
For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the $ame. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated device, and such further applicatia~ns of the principles of the invention as illustrated therein being contemplated as would normally occur to one akill.ed in the art to which the invention relates.

Referring now more particularly to the drawings, there is illustrated in FIGS. 3-4 a side elevation of a preferred embodiment of the percutaneous stent 10 which is formed from a length 11 of stainless steel wire formed in a closed zig-zag configuration. The ends of the wire are closed by a sleeve 12 which is welded or tightly squeezed against the ends of the wire to produce a continuous or endless configuration. The length 11 of wire is arranged in a number of side-by-side straight sections 13. Adjacents straight sections 13 of the stents are adjoined by cusps 14.
Up to this point, the stent 10 of the present invention is, in most respects, similar to the Z-stent described in U.S. Patent No. 4,580,568. In particular, the specific embodiment of the invention includes the wire 11 which is of stainless steel having a 0.018 inch outer diameter. The cusps 14, that is the joint between adjacents straight sections 13, generally circumscribes a radius of no more than 0.2 cm or about .08 inch. As thus configured, the stent 10 is capable of being compressed into a relatively much smaller outer diameter than that shown in FIGS. 3-4, in order to permit insertion of the stmt into the body passageway by use of a catheter or sheath.
In one novel aspect of the present invention, the cusps 14 of the stent are formed into a number of eyes 20. In the preferred embodiment, the eyes are formed in the continuous wire 11 and the intersection between adjacent straight sections 13 at the cusps 14 are soldered or welded together to provide a closed loop for the eyes 20. In one specific embodiment of the invention, the eyes have a diameter of approximately three times the wire diameter, or about .054 inch.
In another embodiment of the invention, multiple stents are combined as shown in FIGS. 5 and 6. In the embodiment of FIG. 5, two self-expanding stents 10' and 10"
are connected or attached at the eyes 20' and 20" at the ends ....r _ of each of the stents. Each of the stents 10~ and 10~~
are generally identical to the stent 10 lust described. In constructing the union between the two stents 10' and.l0 " , the first stent 1~D' is formed from a single length of stainless steel wire 11'. The length of wire il' is formed into the zig-zag and eye configuration although the cusps 14' are not immediately soldered. The free ends of the length of wire 11' are joined by way of the sleeve 12'.
Once the first sbent 10' has been formed, the second stent 10 " is formed from a second length 11 " of stainless steel wire. The second length 11" is formed into the dig-zag and eye configuration so that the eyes 20 " formed at one end of the stent are interlocked with the eyes 20' of the first stent 10'. Once the second stent 10 " is complete, a sleeve 12 " is used to connect the ends of the length of wire 11' and the cusps 14' and 14 " can then be joined or soldered.
A similar method of construction can be used to interconnect a stent 10 " ', which is identical to the atent 10 described above, with a single skirt stent 16', as shown in FIG. 6. In this particular embodiment, the single skirt stent 16' does not have a number of eyes defined at the free end of the skirt.. The free end of the skirt 16' may be formed into the c:vnfiguration of hooks to prevent migration of the stent and skirt combination once the combination is Placed within then body passageway. It is understood that in the embodiments of FIGS. 5 and 6, the eyes at one end of one stent or skirt may be connected to a atent having only bends or cusps at its connecting end. in a manner similar to the connection between skirt 16' and a similar skirt 16" shown in FIG. 6.
In another embodiment of the present invention, a Btent 30 is farmed from a length of wire 31 into a zig-zag configuration identical to the stent 10 shown in FIG. 3. A
number of eyes 35 are formed at least at one end of the stent 30. A thread 40, preferably a monofilament of biv-compatible material, is passed through successive eyes 2~~~I~~~~
_g_ around the circumlEerence of the expanded stent 30. The thread 40 is passed through the eyes 35 by first passing one end 40a through each aucc~asive eye 35 while retaining the other end 40b out~aide and apart from the atent 30. The first end 40a of ithe thread 40 is threaded once through each of the eyes 35 in a 360° loop and then 180° further through successive eyes, or about 540° around the circumference of the stent, ao thai: some of the eyes 35 will have two passes of the thread 40 l:herethrough. Thus, as shown in FIG. 7A, the two free ends 40a and 40b of the thread 40 are situated at 180°opposite eyes 35 of the stent 30. The thread 40 can then be used to collapse one end of the self-expanding wire stent by pulling both free ends 40a and 40b of the thread 40. When the frees ends 40a and 40b ate pulled simultaneously, the diameter of the thread 40. and therefore the diameter of one end of the scent 30, is decreased.
Alternatively, thEa thread 40 can be used to limit the expanded diameter of the stent by tying the free ends 40a and 40b directly t~djacent the -atent.
In using the percutaneoua atent of the present invention, an insertion technique similar to that described in the Gianturco "568 patent is employed. as shown in FIG.
8. A self-expandjing stent 50 includes a number of eyes 55 at each end of the scent 50 and is identical in all respects a5 to the atent 30 shown in FIG. 7A. The monofilament thread 56 passes through the eyes 55 at one end of the scent 50.
In the method of iinsertion, the scent is compressed to its reduced diameter and disposed within a sheath 60. as shown in FIG. 8. The free ends 56a and 56b of the filament 56 eztend outside the sheath 60 and extErior to the patient's body for access a1°ter the atent has been inserted. For ezample, when the scent is used as a proatatic atent, the filament 56 hae a length of 30 to 40 cm measured from the atent 50 to each of the free ends 56a and 56b, so that the free ends may eztend down from the prostate gland to the end of the urethra, f4hen the atent 50 is used as a vascular stent. the length .of the filament 56 may be considerably shorter, provided the ends 56a and 56b are situated outside the puncture site end are sufficiently long to be anchored onto the skin nearby.
In the preferred embodiment, the free ends 56a and 56b of the filament 56 are tied together so that they can be easily controlled and maintained. When the stent 5o is compressed within the sheath 60. a pusher 61 i~s used to hold the atent 50 in position when the body passageway while the sheath 60 is withdrawn. The pusher 61 may have a channel 62 within Which the monofilament 56 can be disposed to prevent any pinching or tugging of the filament while the sheath 60 is being removed. Once the sheath is removed, the pusher 61 can also be removed so that the stent 50 remains in position within the body passageway as shown in FIG. 9. The monofilament 56 trails the stent and passes outside the body as described above.
In certain medical operations, the scent 50 need only be positioned temporarily within the body passageway. Thus, in another method of the present invention, illustrated with reference to FIGS. l0A-lOC, the stent 50 is retrieved from the body paasagewa~y and removed. In the method of this embodiment, a tubes 70 is threaded over the free ends of the monofilament 56 and inserted into the body passageway along the monofilament 5.6 until it is adjacent the implanted stent 50, as shown in P'1:G. 10A. Once the tube 70 is positioned directly adjacent the scent 50, the free ends of the monofilament 56 can be pulled through the tube 70, thereby compressing or contracting one end of the scent 50 to a reduced diameter, as shown in FIG. 10B. With the end of the atent 50 thus compressed, a sheath 75 can be introduced into the body passageway over the tube 70, as shown in FIG. lOC.
The sheath 75 has an inner diameter larger than the reduce diameter of the end of the stent 50. The sheath 75 is continually conve;red into the body peassg~wey over the tube 70 until it contacts and compresses the remaining length of ~~~~7~~':~3 the self-eapandinct stent 50. Once the sheath 75 completely covers or shrouds the stent 50, that is when the atent 50 is disposed entirely within the sheath 75, the entire assembly can be removed from the body passageway. In the preferred embodiment of the present method, the tube 70 end sheath 75 are composed of mESdical grade plastic, such as an 8-polyethylene tubing.
While the inve:ntion has been illustrated and described in detail in the ~Irawings and foregoing description, the same is to be coneoidered as illustrative and not restrictive in character, it being understood that only the preferred embodiments have kreen shown and described and that all changes and modifications that come within the spirit of the invention are desired to be protected.

Claims (13)

1. A stent assembly comprising:
a first wire formed into a closed zig-zag configuration including;
a series of straight sections having opposite ends, said straight sections being joined by bends at said opposite ends to form a stent;
a set of eyes formed at several of said bends at one of said opposite ends;
and a thread passing through successive ones of said set of eyes, said thread including a pair of free ends trailing from said stent;
wherein said stent is resiliently contractable into a smaller first shape for conveyance through a body passageway; and wherein said stent is resiliently expandable into a second shape in which the straight sections press against the walls of the body passageway.
2. The stent assembly of claim 1, wherein:
said second shape of said stent includes a circumference at said one of said opposite ends, said set of eyes being situated at said circumference; and said thread passes through successive eyes at least 360° around said circumference.
3. The stent assembly of claim 2, wherein said thread passes through successive eyes approximately 540° around said circumference.
4. The stent assembly of claim 1, wherein said free ends are sufficiently long to extend outside the body passageway when said stent is situated within the passageway.
5. The stent assembly of claim 1, further comprising:
a second wire formed into a closed zig-zag configuration including;
a second series of straight sections having opposite ends, said straight sections being joined by bends at said opposite ends to form a second stent;
a second set of eyes formed at several of said bends at one of said opposite ends;
wherein said second stent is resiliently contractable into a smaller first shape for conveyance through a body passageway;
wherein said second stent is resiliently expandable into a second shape in which the straight sections press against the walls of the body passageway;
and wherein said second set of eyes of said second wire are engaged about said first wire at one of said opposite ends.
6. The stent assembly of claim 5, wherein:
said first wire includes a third set of eyes formed at several bends at the other of said opposite ends of said first wire; and said second set of eyes of said second wire are interengaged with said third set of eyes.
7. A method for combining a first and second self expanding stent to form a stent assembly for insertion into a body passageway comprising the steps of:
forming a first stent from a first length of wire formed into a closed zig-zag configuration having a series of straight sections joined at their ends by a plurality of bends;
forming a second stent from a second length of wire with opposing ends formed into a zig-zag configuration having a series of straight sections joined at their ends by a plurality of bends, the bends at one end forming eyes open at the straight sections of the second stent;
engaging the eyes at the one end of the second stent about bends at one end of the first stent;
closing the eyes at the one end of the second stent by joining the straight sections of the second stent at the one end of the second stent to encircle the portion of the first wire passing therethrough; and attaching the opposing ends of the second length of wire to one another, said second length of wire thereby forming a closed zig-zag configuration.
8. The method of claim 7 wherein:
the step of forming the first stent includes forming eyes at the one end of the first stent, the eyes open at the straight sections of the first stent; and the step of engaging the eyes at one end of the second stent includes interlocking the eyes of the second stent with the eyes of the first stent and closing the eyes at the one end of the first stent.
9. The use of a stent assembly as described in any of claims 1 to 6 to open a blood vessel wherein the blood flow is restricted or stopped.
10. The use of a stent assembly as described in claim 9 wherein the blood flow through the blood vessel is restricted or stopped as a result of arteriosclerosis.
11. The use of a stent assembly as described in any of claims 1 to 6 to open the urethra wherein flow there through is restricted or stopped.
12. The use of a stent assembly described in claim 11 wherein the flow through the urethra is restricted or stopped by diseases of the prostrate gland.
13. A commercial package comprising a stent assembly as described in any of the claims 1 to 6 together with instructions for its use as described in any of the claims 9 to 12.
CA002007648A 1989-10-17 1990-01-12 Percutaneous stent and method for retrieval thereof Expired - Lifetime CA2007648C (en)

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ATE121636T1 (en) 1995-05-15
DK0622088T3 (en) 1998-12-07
AU637593B2 (en) 1993-06-03
DE69032287D1 (en) 1998-06-04
AU4786590A (en) 1991-04-26
JPH0581257B2 (en) 1993-11-12
JPH03133446A (en) 1991-06-06
ES2118313T3 (en) 1998-09-16
DE69018922T2 (en) 1995-08-24
ATE165520T1 (en) 1998-05-15
US5035706A (en) 1991-07-30
ES2071005T3 (en) 1995-06-16
EP0423916A1 (en) 1991-04-24
CA2007648A1 (en) 1991-04-17
DK0423916T3 (en) 1995-09-18
DE69018922D1 (en) 1995-06-01
EP0622088B1 (en) 1998-04-29
EP0423916B1 (en) 1995-04-26
DE69032287T2 (en) 1999-01-21
EP0622088A1 (en) 1994-11-02

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