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US5741333A Expired / Lapsed US ⏱️ 0.0 years remaining

Self-expanding stent for a medical device to be introduced into a cavity of a body

Assignee: Corvita Corp
•
Filing: 1996-04-03
•
Granted: 1998-04-21
•
Expires: 2016-04-03
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Abstract

Abstract A self-expanding stent is provided for introduction into a cavity of a human body. The stent has a tubular body which is radially expansible and axially retractable between a working state and a resting state. The tubular body has first and second plaited filaments which provide a middle portion of a first diameter and two flared end portions of increasingly larger diameter as they extend away from the middle portion. Each flared end portion has an axial length along a longitudinal axis of the stent which is greater than an axial length of the portion of minimal diameter. Preferably, the middle portion is a single location, with the diameter of the stent increasing in both directions from that location to the ends of the stent. Different shaped stents are disclosed, including stents having generatrices taking the form of line segments angled relative to the longitudinal axis, and generatrices taking the form of a hyperbola segment or a circle arc segment.

Inventors

  • 👤 Noureddine Frid

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-22 20:11
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/82; A61F2/86; A61F2/90; A61F2230/00; A61F2230/0063; A61F2230/0073; A61F2230/0078; A61F2250/00; A61F2250/0014; A61F2250/0039

Claims Analysis

Total Claims: 23
Claim 1
Independent Claim 177 words
A self-expanding stent for introduction into a cavity of a human or animal body, comprising: a tubular body which is radially expandable and axially retractable between a compressed state and a resting state, and is axially expandable and radially retractable between said resting state and said compressed state, and having first filaments having elastic memory wound along a first direction around a longitudinal axis of said tubular body, and second filaments having elastic memory wound along a second direction, opposite to said first direction, around said longitudinal axis, each filament wound in one of said directions crossing filaments wound in the other direction according to a plaited arrangement, wherein, in said resting state prior to introduction into a cavity, said tubular body includes a middle portion of a first diameter and two flared end portions starting with said first diameter and of increasingly larger diameter as they extend away from said middle portion, wherein each of said flared end portions has an axial length along said longitudinal axis greater than an axial length of said middle portion.
Claim 2
Dependent Claim 177 words
A self-expanding stent for introduction into a cavity of a human or animal body, comprising: a tubular body which is radially expandable and axially retractable between a compressed state and a resting state, and is axially expandable and radially retractable between said resting state and said compressed state, and having first filaments having elastic memory wound along a first direction around a longitudinal axis of said tubular body, and second filaments having elastic memory wound along a second direction, opposite to said first direction, around said longitudinal axis, each filament wound in one of said directions crossing filaments wound in the other direction according to a plaited arrangement, wherein, in said resting state prior to introduction into a cavity, said tubular body includes a middle portion of a first diameter and two flared end portions starting with said first diameter and of increasingly larger diameter as they extend away from said middle portion, wherein each of said flared end portions has an axial length along said longitudinal axis greater than an axial length of said middle portion.
Claim 3
Dependent Claim 49 words
A self-expanding stent according to claim 1, wherein: said middle portion is substantially a location on said stent, and said tubular body has a diameter which increases continuously from said location to a first end of said stent and from said location to a second end of said stent.
Claim 4
Dependent Claim 40 words
A self-expanding stent according to claim 1, wherein: said stent has first and second ends, and between each of said ends and said middle portion said tubular body is defined by a generatrix in the shape of a straight line.
Claim 5
Dependent Claim 40 words
A self-expanding stent according to claim 1, wherein: said stent has first and second ends, and between each of said ends and said middle portion said tubular body is defined by a generatrix in the shape of a curved segment.
Claim 6
Dependent Claim 14 words
A self-expanding stent according to claim 4, wherein: said curved segment is a hyperbola.
Claim 7
Dependent Claim 15 words
A self-expanding stent according to claim 4, wherein: said curved segment is a circle arc.
Claim 8
Dependent Claim 37 words
A self-expanding stent according to claim 2, wherein: a portion between each of said first and second ends of said stent and said middle portion is defined by a generatrix in the shape of a straight line.
Claim 9
Dependent Claim 37 words
A self-expanding stent according to claim 2, wherein: a portion between each of said first and second ends of said stent and said middle portion is defined by a generatrix in the shape of a curved segment.
Claim 10
Dependent Claim 19 words
A self-expanding stent according to claim 2, wherein: said location is located half-way between said first and second ends.
Claim 11
Dependent Claim 24 words
A self-expanding stent according to claim 2, wherein: said location is located a shorter distance from said first end than from said second end.
Claim 12
Dependent Claim 36 words
A self-expanding stent according to claim 1, wherein: said stent has a first end having a second diameter, and a second end having a third diameter, and said third diameter is larger than said second diameter.
Claim 13
Dependent Claim 36 words
A self-expanding stent according to claim 1, wherein: said stent has a first end having a second diameter, and a second end having a third diameter, and said third diameter is equal to said second diameter.
Claim 14
Dependent Claim 23 words
A self-expanding stent according to claim 1, wherein: each of said first filaments and each of said second filaments are individually wound filaments.
Claim 15
Dependent Claim 33 words
A self-expanding stent according to claim 1, wherein: a plurality of said first filaments are arranged side by side in a number at least equal to two and thus form first multiple filaments.
Claim 16
Dependent Claim 27 words
A self-expanding stent according to claim 1, further comprising: an expandable covering located on one of an internal surface and an external surface of said tubular body.
Claim 17
Dependent Claim 13 words
A self-expanding stent according to claim 1, wherein: said filaments are metal filaments.
Claim 18
Independent Claim 199 words
A method for preparing an self-expanding stent for introduction into a cavity of a body, comprising: a) plaiting filaments originating from interposed reels rotating in opposite directions so as to form a plaited stent which is radially expansible and retractable between a working state and a resting state of the stent, and is axially expansible and retractable between said working state and said resting state, and having a location of minimum first diameter; b) providing a tube having an internal cavity having a middle portion of a second diameter smaller than said minimum first diameter, and two flared end portions starting with said second diameter and of increasingly larger diameter as they extend away from said middle portion, wherein each of said flared end portions has an axial length along a longitudinal axis of said tube greater than an axial length of said portion of minimum first diameter; c) axially expanding said plaited stent and introducing it into said tube; d) thermally treating, setting, and fixing said stent while in said tube in order to fix said stent so that in said resting state, said stent has a shape corresponding to that of said internal cavity of said tube.
Claim 19
Independent Claim 199 words
A method for preparing an self-expanding stent for introduction into a cavity of a body, comprising: a) plaiting filaments originating from interposed reels rotating in opposite directions so as to form a plaited stent which is radially expansible and retractable between a working state and a resting state of the stent, and is axially expansible and retractable between said working state and said resting state, and having a location of minimum first diameter; b) providing a tube having an internal cavity having a middle portion of a second diameter smaller than said minimum first diameter, and two flared end portions starting with said second diameter and of increasingly larger diameter as they extend away from said middle portion, wherein each of said flared end portions has an axial length along a longitudinal axis of said tube greater than an axial length of said portion of minimum first diameter; c) axially expanding said plaited stent and introducing it into said tube; d) thermally treating, setting, and fixing said stent while in said tube in order to fix said stent so that in said resting state, said stent has a shape corresponding to that of said internal cavity of said tube.
Claim 20
Dependent Claim 35 words
A method according to claim 17, wherein: after said introducing said stent into said tube, at least one of a first end and a second end of said stent protrudes and flares from said tube.
Claim 21
Dependent Claim 27 words
A method according to claim 17, further comprising: prior to said plaiting, winding at least some of the interposed reels with multiple filaments arranged side by side.
Claim 22
Dependent Claim 61 words
A self-expanding stent for introduction into a cavity of a human or animal body, comprising: a tubular body which is radially expandable and axially retractable between a compressed state and a resting state, and is axially expandable and radially retractable between said resting state and said compressed state, said tubular body having two flared end portions having ends of different diameter.
Claim 23
Dependent Claim 61 words
A self-expanding stent for introduction into a cavity of a human or animal body, comprising: a tubular body which is radially expandable and axially retractable between a compressed state and a resting state, and is axially expandable and radially retractable between said resting state and said compressed state, said tubular body having two flared end portions having ends of different diameter.

References Cited (Backward Citations)

US1920495A Cited
US2836181A Cited
US2997839A Cited
US3105492A Cited
US3095017A Cited
US3317924A Cited
US3463158A Cited
US3272204A Cited
US3304557A Cited
US3526906A Cited
US3585707A Cited
US3485234A Cited
FR1602513A Cited
GB1205743A Cited
US3562820A Cited
US3479670A Cited
US3580289A Cited
US3509883A Cited
US3626947A Cited
US3710777A Cited
US3730835A Cited
US3878565A Cited
US3868956A Cited
US3822238A Cited
US3974526A Cited
US4044404A Cited
US3929126A Cited
US3993078A Cited
US4459252A Cited
US4355426A Cited
US4106129A Cited
US4173689A Cited
US4134402B1 Cited
US4134402A Cited
US4193138A Cited
US4086665A Cited
US4140126A Cited
US4130904A Cited
US4164045A Cited
GB2015118A Cited
US4323071A Cited
US4323071B1 Cited
GB2033233A Cited
DE3019996A1 Cited
GB2077107A Cited
US4850999A Cited
US4441215A Cited
US4731073A Cited
US4475972A Cited
US4692141A Cited
US4655771B1 Cited
US4655771A Cited
US4954126B1 Cited
GB2135585A Cited
US4954126A Cited
US4503569A Cited
US4610688A Cited
US4583968A Cited
US4743251A Cited
US4787899A Cited
US4871357A Cited
US4878906A Cited
US5061275A Cited
WO1988000813A1 Cited
US4875480A Cited
US4935006A Cited
US5188593A Cited
US4895561A Cited
US5015253A Cited
US5026377A Cited
US5545208A Cited
WO1991012779A1 Cited
US5279561A Cited
US5242399A Cited
US5123917A Cited
US5078720A Cited
US5064435A Cited
EP0587197A1 Cited
US5330500A Cited
US5160341A Cited
US5116360A Cited
US5197978A Cited
US5197978B1 Cited
US5433723A Cited
US5235966A Cited
US5383892A Cited
US5201757A Cited
US5395390A Cited
US5405378A Cited
US5290295A Cited
US5312415A Cited
US5382259A Cited
US5503636A Cited
WO1994024961A1 Cited
US5360397A Cited
US5618301A Cited
US5415664A Cited
US5397355A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2001-04-20 2001-10-20 2002-04-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2005-04-20 2005-10-20 2006-04-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2009-04-20 2009-10-20 2010-04-21 $7700.00 Window Closed / Lapsed

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