ATE504260T1 - System zur positionierung eines stent-grafts - Google Patents

System zur positionierung eines stent-grafts

Info

Publication number
ATE504260T1
ATE504260T1 AT07824173T AT07824173T ATE504260T1 AT E504260 T1 ATE504260 T1 AT E504260T1 AT 07824173 T AT07824173 T AT 07824173T AT 07824173 T AT07824173 T AT 07824173T AT E504260 T1 ATE504260 T1 AT E504260T1
Authority
AT
Austria
Prior art keywords
stent graft
user
stent
graft
positioning
Prior art date
Application number
AT07824173T
Other languages
English (en)
Inventor
Robert Goddard
Duncan Keeble
Original Assignee
Anson Medical Ltd
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 Anson Medical Ltd filed Critical Anson Medical Ltd
Application granted granted Critical
Publication of ATE504260T1 publication Critical patent/ATE504260T1/de

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
    • A61F2/02—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
    • A61F2/95—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
    • A61F2/02—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
    • 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
    • A61F2/50—Prostheses not implantable in the body
    • A61F2/76—Means for assembling, fitting or testing prostheses, e.g. for measuring or balancing, e.g. alignment means
    • 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
    • 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

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Gastroenterology & Hepatology (AREA)
  • Pulmonology (AREA)
  • Prostheses (AREA)
  • Media Introduction/Drainage Providing Device (AREA)
AT07824173T 2006-10-16 2007-10-15 System zur positionierung eines stent-grafts ATE504260T1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0620495.2A GB0620495D0 (en) 2006-10-16 2006-10-16 Apparatus and method for positioning a stent graft
PCT/GB2007/003922 WO2008047092A1 (en) 2006-10-16 2007-10-15 System and method for positioning a stent graft

Publications (1)

Publication Number Publication Date
ATE504260T1 true ATE504260T1 (de) 2011-04-15

Family

ID=37491585

Family Applications (1)

Application Number Title Priority Date Filing Date
AT07824173T ATE504260T1 (de) 2006-10-16 2007-10-15 System zur positionierung eines stent-grafts

Country Status (16)

Country Link
US (1) US8979919B2 (de)
EP (1) EP2083747B1 (de)
JP (1) JP5260530B2 (de)
KR (1) KR101431776B1 (de)
CN (1) CN101557776B (de)
AT (1) ATE504260T1 (de)
AU (1) AU2007311646B2 (de)
BR (1) BRPI0717119A2 (de)
CA (1) CA2666656A1 (de)
DE (1) DE602007013794D1 (de)
ES (1) ES2363816T3 (de)
GB (1) GB0620495D0 (de)
NZ (1) NZ576233A (de)
PL (1) PL2083747T3 (de)
RU (1) RU2460496C2 (de)
WO (1) WO2008047092A1 (de)

Families Citing this family (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101715329B (zh) 2007-03-05 2012-11-14 恩多斯潘有限公司 多组件可膨胀式支持性分叉腔内移植物和用于使用该移植物的方法
CA2709278A1 (en) 2007-12-15 2009-06-25 Endospan Ltd. Extra-vascular wrapping for treating aneurysmatic aorta in conjunction with endovascular stent-graft and methods thereof
US8858610B2 (en) 2009-01-19 2014-10-14 W. L. Gore & Associates, Inc. Forced deployment sequence
US8876877B2 (en) * 2009-04-23 2014-11-04 Medtronic Vascular, Inc. Centering for a TAA
EP2445444B1 (de) 2009-06-23 2018-09-26 Endospan Ltd. Gefässprothese zur behandlung von aneurysmen
US8979892B2 (en) 2009-07-09 2015-03-17 Endospan Ltd. Apparatus for closure of a lumen and methods of using the same
CA2782357C (en) 2009-11-30 2018-06-05 Endospan Ltd. Multi-component stent-graft system for implantation in a blood vessel with multiple branches
US9101457B2 (en) 2009-12-08 2015-08-11 Endospan Ltd. Endovascular stent-graft system with fenestrated and crossing stent-grafts
US8956397B2 (en) 2009-12-31 2015-02-17 Endospan Ltd. Endovascular flow direction indicator
CA2789304C (en) 2010-02-08 2018-01-02 Endospan Ltd. Thermal energy application for prevention and management of endoleaks in stent-grafts
US9468547B2 (en) 2010-11-11 2016-10-18 W. L. Gore & Associates, Inc. Deployment of endoluminal devices
US9414944B2 (en) * 2010-11-11 2016-08-16 W. L. Gore & Associates, Inc. Deployment sleeve shortening mechanism
US9095466B2 (en) * 2010-11-16 2015-08-04 W. L. Gore & Associates, Inc. Apposition fiber for use in endoluminal deployment of expandable devices in tortuous anatomies
EP2579810A4 (de) 2011-02-03 2014-07-30 Endospan Ltd Aus einem formspeichernden material hergestellte implantierbare medizinische vorrichtungen
WO2012111006A1 (en) 2011-02-17 2012-08-23 Endospan Ltd. Vascular bands and delivery systems therefor
US9486341B2 (en) 2011-03-02 2016-11-08 Endospan Ltd. Reduced-strain extra-vascular ring for treating aortic aneurysm
US9028540B2 (en) * 2011-03-25 2015-05-12 Covidien Lp Vascular stent with improved vessel wall apposition
US9744033B2 (en) 2011-04-01 2017-08-29 W.L. Gore & Associates, Inc. Elastomeric leaflet for prosthetic heart valves
GB201106017D0 (en) * 2011-04-08 2011-05-25 Lombard Medical Plc Apparatus for deploying a stent graft
CN108095871B (zh) * 2011-04-29 2020-11-13 苏州舒通医疗科技有限公司 血管内修复体及输送装置
US8574287B2 (en) 2011-06-14 2013-11-05 Endospan Ltd. Stents incorporating a plurality of strain-distribution locations
US10117765B2 (en) * 2011-06-14 2018-11-06 W.L. Gore Associates, Inc Apposition fiber for use in endoluminal deployment of expandable implants
ES2568377T3 (es) 2011-06-21 2016-04-28 Endospan Ltd Sistema endovascular con endoprótesis que solapan circunferencialmente
EP2729095B1 (de) 2011-07-07 2016-10-26 Endospan Ltd. Stentfixierung mit reduzierter plastischer verformung
US9839510B2 (en) 2011-08-28 2017-12-12 Endospan Ltd. Stent-grafts with post-deployment variable radial displacement
US9554806B2 (en) 2011-09-16 2017-01-31 W. L. Gore & Associates, Inc. Occlusive devices
WO2013065040A1 (en) 2011-10-30 2013-05-10 Endospan Ltd. Triple-collar stent-graft
US9877858B2 (en) 2011-11-14 2018-01-30 W. L. Gore & Associates, Inc. External steerable fiber for use in endoluminal deployment of expandable devices
US9782282B2 (en) 2011-11-14 2017-10-10 W. L. Gore & Associates, Inc. External steerable fiber for use in endoluminal deployment of expandable devices
WO2013084235A2 (en) 2011-12-04 2013-06-13 Endospan Ltd. Branched stent-graft system
US9375308B2 (en) 2012-03-13 2016-06-28 W. L. Gore & Associates, Inc. External steerable fiber for use in endoluminal deployment of expandable devices
US9770350B2 (en) 2012-05-15 2017-09-26 Endospan Ltd. Stent-graft with fixation elements that are radially confined for delivery
US9254205B2 (en) 2012-09-27 2016-02-09 Covidien Lp Vascular stent with improved vessel wall apposition
KR101996604B1 (ko) * 2012-10-31 2019-07-04 이베이스크 뉴로베스쿨러 엔터프라이즈 유엘씨 혈관내 보철물
CN105007860B (zh) 2013-01-08 2017-05-10 恩多斯潘有限公司 在植入期间支架移植物迁移的最小化
WO2014141232A1 (en) 2013-03-11 2014-09-18 Endospan Ltd. Multi-component stent-graft system for aortic dissections
US11911258B2 (en) 2013-06-26 2024-02-27 W. L. Gore & Associates, Inc. Space filling devices
DE102013018426A1 (de) * 2013-11-04 2015-05-07 Bentley Innomed Gmbh Stent mit Rückhalteelement
WO2015075708A1 (en) 2013-11-19 2015-05-28 Endospan Ltd. Stent system with radial-expansion locking
RU2551627C1 (ru) * 2014-03-17 2015-05-27 Федеральное государственное бюджетное учреждение "Российский научный центр хирургии имени академика Б.В. Петровского Российской академии медицинских наук (ФГБУ "РНЦХ им. акад. Б.В. Петровского РАМН) Способ моделирования зоны фиксации стент-графта в дистальной части восходящей аорты при гибридных вмешательствах
WO2016098113A1 (en) 2014-12-18 2016-06-23 Endospan Ltd. Endovascular stent-graft with fatigue-resistant lateral tube
US11129622B2 (en) 2015-05-14 2021-09-28 W. L. Gore & Associates, Inc. Devices and methods for occlusion of an atrial appendage
RU170287U1 (ru) * 2016-12-14 2017-04-19 Федеральное государственное бюджетное научное учреждение "Томский национальный исследовательский медицинский центр Российской академии наук" (Томский НИМЦ) Устройство для атравматичного антеградного введения в нисходящую аорту гибридного стент-графта "e-vita open plus" при гибридных операциях на грудной аорте
ES2952776T3 (es) 2017-02-14 2023-11-06 Gore & Ass Sistemas de colocación de dispositivos médicos implantables
US11173023B2 (en) 2017-10-16 2021-11-16 W. L. Gore & Associates, Inc. Medical devices and anchors therefor
EP3709932A4 (de) * 2017-11-15 2021-08-11 Hemodynamx-Technologies Ltd Vorrichtung und verfahren zur reduktion des aortendruckverlusts
US10587553B1 (en) * 2017-12-29 2020-03-10 Entefy Inc. Methods and systems to support adaptive multi-participant thread monitoring
EP3801383A4 (de) 2018-05-31 2022-03-16 Endologix LLC Stenttransplantatsysteme mit rückhaltemitteln in kanälen und verfahren dafür

Family Cites Families (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5693083A (en) * 1983-12-09 1997-12-02 Endovascular Technologies, Inc. Thoracic graft and delivery catheter
US4913141A (en) * 1988-10-25 1990-04-03 Cordis Corporation Apparatus and method for placement of a stent within a subject vessel
US5290305A (en) * 1991-10-11 1994-03-01 Kanji Inoue Appliance collapsible for insertion into human organs and capable of resilient restoration
US5464449A (en) * 1993-07-08 1995-11-07 Thomas J. Fogarty Internal graft prosthesis and delivery system
US5531785A (en) * 1994-05-06 1996-07-02 Autogenics, Inc. Prosthetic heart valve holder
WO1996036297A1 (fr) * 1995-05-19 1996-11-21 Kanji Inoue Instrument de transplantation, procede pour le courber et procede pour le transplanter
DE69629698T2 (de) 1995-06-06 2004-02-26 Endotex Interventional Systems, Inc., Menlo Park Transplantat zum ausbessern eines aneurysmas
US5713948A (en) * 1995-07-19 1998-02-03 Uflacker; Renan Adjustable and retrievable graft and graft delivery system for stent-graft system
DE69732411T2 (de) * 1996-06-20 2006-01-19 Vascutek Ltd., Renfrewshire Reparieren von Körpergefäßen durch Prothesen
US5824055A (en) * 1997-03-25 1998-10-20 Endotex Interventional Systems, Inc. Stent graft delivery system and methods of use
US7520890B2 (en) * 1998-01-26 2009-04-21 Phillips Peter W Reinforced graft and method of deployment
JP4197842B2 (ja) * 1998-01-26 2008-12-17 アンソン メディカル リミテッド 強化移植片
US6102918A (en) * 1998-02-18 2000-08-15 Montefiore Hospital And Medical Center Collapsible low-profile vascular graft implantation instrument and method for use thereof
US6015422A (en) * 1998-02-18 2000-01-18 Montefiore Hospital And Medical Center Collapsible low-profile vascular graft implantation instrument and method for use thereof
US6099548A (en) * 1998-07-28 2000-08-08 Taheri; Syde A. Apparatus and method for deploying an aortic arch graft
US6855159B1 (en) * 1999-02-05 2005-02-15 Eva Corporation Surgical guide line assembly and separator assembly for use during a surgical procedure
RU2169544C1 (ru) * 2000-05-16 2001-06-27 НПЦ "ИНТЕКО" ГП "Красная Звезда" Средство для поддержания просвета сосуда или полого органа
US20030050684A1 (en) * 2001-09-10 2003-03-13 Abrams Robert M. Internal restraint for delivery of self-expanding stents
US6761733B2 (en) * 2001-04-11 2004-07-13 Trivascular, Inc. Delivery system and method for bifurcated endovascular graft
US6821291B2 (en) * 2001-06-01 2004-11-23 Ams Research Corporation Retrievable stent and method of use thereof
JP4043216B2 (ja) * 2001-10-30 2008-02-06 オリンパス株式会社 ステント
US6723116B2 (en) * 2002-01-14 2004-04-20 Syde A. Taheri Exclusion of ascending/descending aorta and/or aortic arch aneurysm
AU2003214209A1 (en) * 2002-03-18 2003-10-08 Eva Corporation Method and apparatus to attach an unsupported surgical component
WO2004017868A1 (en) 2002-08-23 2004-03-04 William A. Cook Australia Pty. Ltd. Asymmetric stent graft attachment
US7611528B2 (en) * 2003-01-24 2009-11-03 Medtronic Vascular, Inc. Stent-graft delivery system
US7101390B2 (en) 2003-05-27 2006-09-05 Scimed Life Systems, Inc. Staged deployment endograft
CA2539931A1 (en) * 2003-09-30 2005-04-14 Alveolus Inc Removable stent
UA66321A (en) * 2003-12-22 2004-04-15 Mykola Oleksandrovych Zorin Method for switching off cerebral aneurisms, particularly those of giant size and with wide neck
US8043354B2 (en) 2004-06-16 2011-10-25 William A. Cook Australia Pty. Ltd. Thoracic deployment device and stent graft
US7758626B2 (en) * 2004-07-20 2010-07-20 Medtronic Vascular, Inc. Device and method for delivering an endovascular stent-graft having a longitudinally unsupported portion
CA2581857C (en) * 2004-09-28 2013-07-16 William A. Cook Australia Pty. Ltd. Device for treating aortic dissection
US8287583B2 (en) * 2005-01-10 2012-10-16 Taheri Laduca Llc Apparatus and method for deploying an implantable device within the body

Also Published As

Publication number Publication date
EP2083747B1 (de) 2011-04-06
BRPI0717119A2 (pt) 2013-10-15
PL2083747T3 (pl) 2011-09-30
US8979919B2 (en) 2015-03-17
DE602007013794D1 (de) 2011-05-19
CA2666656A1 (en) 2008-04-24
CN101557776A (zh) 2009-10-14
JP5260530B2 (ja) 2013-08-14
GB0620495D0 (en) 2006-11-22
AU2007311646B2 (en) 2013-01-24
US20110125252A1 (en) 2011-05-26
KR101431776B1 (ko) 2014-08-20
JP2010506605A (ja) 2010-03-04
RU2460496C2 (ru) 2012-09-10
KR20090092756A (ko) 2009-09-01
NZ576233A (en) 2011-10-28
CN101557776B (zh) 2012-10-10
ES2363816T3 (es) 2011-08-17
WO2008047092A1 (en) 2008-04-24
EP2083747A1 (de) 2009-08-05
AU2007311646A1 (en) 2008-04-24
RU2009113550A (ru) 2010-11-27

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