Patent EP0409929B1 successfully refreshed from Google Patents.
EP0409929B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Stent delivery system
Assignee: Boston Scientific Corp
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Filing: 1989-11-01
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Granted: 1997-04-23
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Expires: 2009-11-01
Abstract
Abstract A stent delivery system (10) to facilitate introduction and placement of a stent (16) includes a catheter (8) with an expansible distal portion (14) that expands the catheter outer diameter from contracted to expanded state. A stent positioned around the catheter distal portion has a contracted condition sized to closely surround the catheter and is expansible to an expanded condition. An end portion of the stent defines a margin (15 ou 17) lying over the catheter expansible portion. A sleeve (18 or 20) in the region of the catheter distal portion is positioned around the catheter and has a first end fixed (at 22 or 24) to the catheter and a second end defining a margin (19 or 21) lying over the stent margin. The sleeve fixes the end of the stent on the catheter when the catheter is in contracted state. Expansion of the catheter from contracted to expanded state causes expansion of the stent, including the stent margin, from contracted to expanded condition. This causes the sleeve margin to slide from over the stent margin to release the stent.
Inventors
- 👤 Michael A. Savin
- 👤 James E. Windheuser
- 👤 Richard A. Noddin
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 12:07
CPC Classifications
A; A61; A61L; A61L31/00; A61L31/14; A61L31/18; A61F; A61F2/00; A61F2/82; A61F2/86; A61F2/90; A61F2/95; A61F2/958; A61F2002/9583; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0013
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
250 words
A stent delivery system comprising: a catheter having an expansible distal portion constructed and arranged for expanding the outer diameter of said catheter from a contracted state to an expanded state; a stent positioned around said distal portion of said catheter, said stent having a contracted condition and being expansible to an expanded condition, and being sized in said contracted condition to closely surround said catheter in the contracted state; and means for removably securing said stent to said catheter, said stent having an end portion defining a margin lying over said expansible portion of said catheter; said delivery system being characterised in that said means for removably securing said stent to said catheter includes a sleeve provided in the region of said distal portion of said catheter and positioned around said catheter, said sleeve having a first end fixed to said catheter, and a second end defining a margin lying over said margin of said stent; in that said sleeve is effective to fix said end portion of said stent on said catheter when said catheter is in the contracted state; and in that expansion of said catheter from said contracted state to said expanded state is effective both to cause expansion of said stent, including said margin of said stent, from said contracted condition to said expanded condition, and to cause said margin of said sleeve to slide relatively axially from over the margin of said stent, thereby releasing said end portion of the stent from said catheter.
Claim 2
Dependent Claim
207 words
A stent delivery system according to Claim 1, further characterised in that said stent has a first and second end portion defining a first margin and a second margin lying over said expansible portion of said catheter; in that a first sleeve and a second sleeve in the region of said distal portion of said catheter are positioned around said catheter, each having a first end fixed to said catheter and a second end defining a margin lying over a said margin of said stent, said first sleeve and said second sleeve separately engaging said stent at said first margin and said second margin respectively; and in that said first sleeve and said second sleeve are effective to fix said ends of said stent on said catheter when said catheter is in the contracted state, said expansion of said catheter from said contracted state to said expanded state being effective to cause expansion of said stent, including said first and second margins of said stent, from said contracted condition to said expanded condition, and to cause said first and second margins of said sleeve to slide axially from over the first and second margins of said stent, thereby releasing said ends of the stent from said catheter.
Claim 3
Dependent Claim
33 words
A stent delivery system according to Claims 1 or 2, further characterised in that said sleeve(s) is(are) elastomeric in a contracted state about said catheter, squeezing the respective margin(s) of said stent thereagainst.
Claim 4
Dependent Claim
26 words
A stent delivery system according to Claim 1, further characterised in that said expansible distal portion comprises a balloon mounted on a shaft of the catheter.
Claim 5
Dependent Claim
21 words
A stent delivery systems according to Claim 4, further characterised in that said stent is expanded by expansion of said balloon.
Claim 6
Dependent Claim
36 words
A stent delivery system according to Claims 1 or 2, further characterised in that said stent is formed of knitted material and the length of said stent does not significantly change when said stent is expanded.
Claim 7
Dependent Claim
31 words
A stent delivery system according to Claim 1, characterised in further comprising fixing means, preferably a detent formed from adhesive, for holding said sleeve at a specific location on said catheter.
Claim 8
Dependent Claim
47 words
A stent delivery system according to Claim 1, characterised in further comprising a haemostasis valve sheath, arranged to be positioned through the skin into a body cavity, and adapted to permit said catheter to be introduced through said sheath into said body cavity without injuring said cavity.
Claim 9
Dependent Claim
27 words
A stent delivery system according to Claim 1, further characterised in that said sleeve overlaps said stent at said margin for a maximum distance of 3 mm.
Claim 10
Dependent Claim
18 words
A stent delivery system according to Claim 1, further characterised in that said sleeve is formed from silicone.
Claim 11
Dependent Claim
64 words
A stent delivery system according to Claim 1, further characterised in that said sleeve is formed from any elastomer able to be expanded at least two times by internal pressure, preferably a pressure between about 3 and 17 atmospheres (3.04 to 17.2 x 10 5 N/m 2 ), which is below that usable with a balloon angioplasty catheter, and formable into a thin-walled tube.
Claim 12
Dependent Claim
23 words
A stent delivery system according to Claim 1, further characterised in that said stent is able to expand elastically in diameter or superelastically.
Claim 13
Dependent Claim
21 words
A stent delivery system according to Claim 1, further characterised in that said stent is able to expand plastically in diameter.
Claim 14
Dependent Claim
37 words
A stent delivery system according to Claim 1, further characterised in that said end of said stent is a distal end, and said sleeve is arranged to fix said stent at the distal end of said stent.
Claim 15
Dependent Claim
20 words
A stent delivery system according to Claim 1, further characterised in that said sleeve has the shape of a cylinder.
Claim 16
Dependent Claim
26 words
A stent delivery system according to Claim 1, further characterised in that said sleeve has axially running regions of weakness where said sleeve contacts said stent.
Claim 17
Dependent Claim
21 words
A stent delivery system according to Claim 1, further characterised in that lubricant is provided between said sleeve and said catheter.
Claim 18
Dependent Claim
20 words
A stent delivery system according to Claim 1, further characterised in that said stent has a lubricous or hydrophilic coating.
Claim 19
Dependent Claim
23 words
A stent delivery system according to Claim 1, further characterised in that said sleeve is formed of radiopaque material, preferably a barium salt.
Claim 20
Dependent Claim
28 words
A stent delivery system according to Claim 1, further characterised in that said balloon has a tapered diameter along at least part of the section under the stent.
Claim 21
Dependent Claim
23 words
A stent delivery system according to Claim 4, further characterised in that only a portion of the stent is positioned over said balloon.
Claim 22
Independent Claim
190 words
A method for fastening a stent to a catheter in a manner to facilitate introduction and later release of said stent into a body cavity, comprising the steps of: a) providing a catheter having an expansible distal portion constructed and arranged for expanding the outer diameter of said catheter, said distal portion having an expanded and a contracted state; b) providing a stent having an expanded and a contracted condition; and c) sliding said stent axially over said catheter in the contracted state and about said distal portion; the method being characterised by the further steps of: d) providing a sleeve in an expanded form, said sleeve also having a contracted form; e) sliding said expanded sleeve axially over said catheter and about a portion of said stent; and f) allowing said sleeve to contract about said catheter and said stent to thereby fix said stent to said catheter when said catheter and said stent are in contracted state and condition, said catheter and stent cooperating whereby said sleeve is released from said stent when said catheter is in its expanded state and said stent is in its expanded condition.
Claim 23
Dependent Claim
28 words
A method according to Claim 22, wherein said sleeve is formed of silicone and said expanded form of said sleeve is provided by soaking said sleeve in freon.
Claim 24
Dependent Claim
22 words
A method according to Claim 22, wherein said sleeve is allowed to contract by causing release of said freon from said sleeve.
Claim 25
Dependent Claim
38 words
A method according to Claim 22, wherein said sleeve is formed of a polymeric material having the ability to expand more than two times in diameter and to retract back to at least close to its original dimension.
Claim 26
Dependent Claim
19 words
A method according to Claim 25, wherein said material is chosen from latex, polyurethane, or polyether amide in water.
Claim 27
Dependent Claim
18 words
A method according to Claim 25, wherein said sleeve is held on the catheter by an adhesive detent.
Claim 28
Dependent Claim
38 words
A method according to Claim 22, wherein two said sleeves are provided; one said sleeve being fixed about a distal end of said stent and the other said sleeve being fixed about a proximal end of said stent.
Claim 29
Dependent Claim
25 words
A method according to Claim 22, further comprising the step of providing fixing means for holding said sleeve at a specific location on said catheter.
Claim 30
Dependent Claim
32 words
A stent delivery system according to Claim 1 or Claim 2, wherein the stent is formed of material that enables the stent to decrease in length when the said stent is expanded.
Claim 31
Dependent Claim
111 words
A stent delivery system comprising: a stent-delivering catheter and a stent carried by said catheter, said stent having a contracted condition and being expansible to an expanded condition, said stent being sized in said contracted condition to correspond to structure of the catheter; said delivery system being characterised in that said stent is self-expanding and comprises a knitted structure of metal wire fabricated so that said knitted structure expands elastically and automatically when released in a cavity of the body to said expanded condition; and in that said catheter has a portion that lies over and holds said stent in the contracted state until said stent is released from said catheter.
Claim 32
Dependent Claim
119 words
A stent delivery system comprising: a stent-delivering catheter and a stent carried by said catheter, said stent having a contracted condition and being expansible to an expanded condition, said stent being sized in said contracted condition to correspond to structure of the catheter; said delivery system being characterised in that said stent is self-expanding and comprises a knitted structure of nitinol wire selected and fabricated such that said knitted structure is effective to expand to said expanded condition as a result of thermal change when released in a cavity of the body; and in that said catheter has a portion that lies over and holds said stent in the contracted state until said stent is released from said catheter.
Claim 33
Dependent Claim
30 words
A stent delivery system according to Claims 31 or 32, further characterised in that said portion of said catheter comprises a flexible sleeve positioned around a margin of said stent.
Claim 34
Dependent Claim
36 words
A stent delivery system according to Claims 31 or 32, further characterised in that said catheter has an expansible distal portion for expanding said stent from said contracted condition to release said stent from said catheter.
References Cited (Backward Citations)
No citation records indexed.
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