DE9321363U1 - Intraluminaler Stent - Google Patents
Intraluminaler StentInfo
- Publication number
- DE9321363U1 DE9321363U1 DE9321363U DE9321363U DE9321363U1 DE 9321363 U1 DE9321363 U1 DE 9321363U1 DE 9321363 U DE9321363 U DE 9321363U DE 9321363 U DE9321363 U DE 9321363U DE 9321363 U1 DE9321363 U1 DE 9321363U1
- Authority
- DE
- Germany
- Prior art keywords
- intraluminal stent
- stent
- loop
- hoop
- intraluminal
- 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
Links
- HLXZNVUGXRDIFK-UHFFFAOYSA-N nickel titanium Chemical compound [Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni] HLXZNVUGXRDIFK-UHFFFAOYSA-N 0.000 claims description 5
- 229910001000 nickel titanium Inorganic materials 0.000 claims description 5
- -1 polypropylene Polymers 0.000 claims description 5
- 239000003356 suture material Substances 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 239000004035 construction material Substances 0.000 claims 1
- 239000000835 fiber Substances 0.000 claims 1
- 229920000139 polyethylene terephthalate Polymers 0.000 claims 1
- 239000000463 material Substances 0.000 description 6
- 239000007943 implant Substances 0.000 description 5
- 238000002513 implantation Methods 0.000 description 5
- 208000031481 Pathologic Constriction Diseases 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000000560 biocompatible material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000010339 dilation Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920004934 Dacron® Polymers 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 210000001124 body fluid Anatomy 0.000 description 1
- 239000010839 body fluid Substances 0.000 description 1
- 244000309464 bull Species 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- 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
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- A—HUMAN NECESSITIES
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- 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
- A61F2/88—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 formed as helical or spiral coils
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- 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
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- 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
- A61F2/02—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
- A61F2/02—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
- A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
- A61F2002/3006—Properties of materials and coating materials
- A61F2002/30092—Properties of materials and coating materials using shape memory or superelastic materials, e.g. nitinol
-
- 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
- A61F2002/30462—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements retained or tied with a rope, string, thread, wire or cable
-
- 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
- A61F2002/823—Stents, different from stent-grafts, adapted to cover an aneurysm
-
- 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
- A61F2210/00—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2210/0014—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof using shape memory or superelastic materials, e.g. nitinol
- A61F2210/0019—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof using shape memory or superelastic materials, e.g. nitinol operated at only one temperature whilst inside or touching the human body, e.g. constrained in a non-operative shape during surgery, another temperature only occurring before the operation
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- 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
- A61F2220/0066—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements stapled
-
- 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
-
- 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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00017—Iron- or Fe-based alloys, e.g. stainless steel
-
- 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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00023—Titanium or titanium-based alloys, e.g. Ti-Ni alloys
-
- 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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00011—Metals or alloys
- A61F2310/00035—Other metals or alloys
- A61F2310/00131—Tantalum or Ta-based alloys
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)
- Prostheses (AREA)
- Media Introduction/Drainage Providing Device (AREA)
Description
Boston Scientific Ireland Ltd. 18.04.1997
R 25381 GBMTl Bd/Sk/He/sm
Intraluminaler Stent
Die vorliegende Erfindung bezieht sich im allgemeinen auf vaskuläre
Prothesen und insbesondere auf einen intraluminalen Stent, der eine flexible &iacgr;&ogr; und elastische rohrförmige Konstruktion mit ausreichender Umfangsstärke
bzw. Umfangswiderstand (hoop strength) aufweist, um ein elastisches
Auffedern von ballon-resistenten Einschnürungen zu verhindern oder um eine verzögerte Aufweitung dieser Verengungen durchzuführen.
Beschreibung des Standes der Technik
Der Stand der Technik umfaßt eine große Vielfalt von intraluminalen Stents
und Transplantaten. Beispielsweise beschreibt Palmaz U. S. -Patent Nr. 4,733,665 ein mittels Ballon aufweitbares intraluminales Transplantat, das ein
Ausführungsbespiel beinhaltet, das ein Rohr aus Maschendraht umfaßt. Sich
überschneidende Drahtelemente, die aneinander an ihren Überschneidungen durch Schweißen, Löten oder Kleben befestigt sind, bilden den Maschendraht
und definieren ein diamantartiges Muster. Diese Struktur stellt einen relativ hohen Widerstand gegenüber radialem Zusammenfallen bereit; allerdings weist
sie eine Anzahl von Nachteilen auf. Zuerst handelt es sich um eine starre Struktur, die nicht einfach die Konfiguration eines kurvigen Gefäßes, das sie
aufnimmt, annehmen kann. Zweitens muß man einen Ballonkatheter verwenden, um sie aufzuweiten und zu implantieren. Dieses Erfordernis
begrenzt die Länge des Implantats, sowie dies auch die Steifigkeit tut.
Andere frühere Stents weisen flexiblere Konstruktionen auf; jedoch haben sie
andere Nachteile. Das Dokument Wiktor U.S. Patent Nr. 4,886,062
beschreibt beispielsweise einen Stent, der eine relativ flexible Konstruktion
aufweist. Diese Konstruktion umfaßt verformbaren Draht, der in ein Zick-Zack-Design gebogen und spiralartig gespult wurde. Das resultierende
Drahtrohr hat eine offene Konfiguration mit einer reduzierten Umfangsstärke.
Jeder Reifen liegt im wesentlichen isoliert von dem benachbarten Reifen und
erhält von diesem keine wesentliche Unterstützung. Außerdem erhöht die offene Konfiguraton das Risiko, daß Plaqueelemente durch die Spule
durchbrechen bzw. durchwachsen. Außerdem muß man einen Ballonkatheter verwenden, um ihn aufzuweiten und zu implantieren. Somit kann der Stent
&iacgr;&ogr; nicht länger sein als der Ballon von verfügbaren Ballonkathetern.
Der intraluminale Stent der vorliegenden Erfindung vermeidet die Nachteile
der Stents und der Transplantate des Standes der Technik. Er weist eine ausreichende Umfangsstärke auf, um ein elastisches Zurückfedern
ballonresistenter Verengungen zu verhindern. Der Stent der vorliegenden Erfindung weist eine flexible Konstruktion auf, die es ihm ermöglicht, der
Krümmung des Gefäßes, das ihn aufnehmen soll, zu folgen. Er weist eine elastische Konstruktion auf, die die Implantation ohne einen Ballonkatheter
erlaubt. Diese Elastizität ermöglicht weiterhin das Zusammendrücken der Struktur und das Zurückfedern bei der Implantierung, um eine verzögerte
Aufweitung des aufnehmenden Gefäßes zu bewerkstelligen.
In Übereinstimmung mit einem Ausführungsbeispiel der vorliegenden Erfindung umfaßt ein intraluminaler Stent ein vorbestimmtes Drahtstück, das
eine sinus- oder zick-zack-förmige Konfiguration aufweist und eine kontinuierliche Helix mit einer Vielzahl von verbundenen Spiralen oder
Reifen definiert. Eine Vielzahl von Schlaufenelementen verbinden benachbarte Stücke von benachbarten Helix-Reifen. Der Stent ist zusammendrückbar und
selbst aufweitbar wesentlich bis zu der Konfiguration vor dem
Zusammendrücken.
In Übereinstimmung mit einem alternativen Ausführungsbeispiel der vorliegenden Erfindung umfaßt ein intraluminaler Stent die kontinuierliche
Helix und die Vielzahl von Schlaufenelementen, wie oben beschrieben. Es umfaßt weiterhin ein Prothesenimplantat, das longitudinal zur Drahthelix
innerhalb der zentralen Öffnung (oder um die Drahthelix) angeordnet ist. Eine oder mehrere der Schlaufenelemente sichert das Transplantat an der
Drahthelix. Dieses Transplantat ist ein flexibler, rohrförmiger Mantel, der es
&iacgr;&ogr; der Drahthelix ermöglicht zu kontrahieren und wiederaufzufedern.
KURZE BESCHREIBUNG DER ZEICHNUNGEN
Für ein vollständiges Verständnis dieser Erfindung sollte man nun Bezug
nehmen auf die Ausführungsbeispiele, die detaillierter in den begleitenden is Zeichnungen veranschaulicht sind und durch Beispiele der Erfindung unten
beschrieben sind. In den Zeichnungen zeigt:
Fig. 1 eine prespektivische Ansicht des intraluminalen Stents der
vorliegenden Erfindung;
Fig. 2-4 Seitenrißansichten einer Nahtverbindung für den Stent von
Fig. 1;
Fig. 5 eine Schnittansicht der Einrichtungen, die verwendet
werden, um den Stent von Fig. 1 zu implantieren;
Fig. 6 eine Schnittansicht der Hülse und der
Kathetervorrichtungen, die verwendet werden, um den
Stent zu imp lautieren, wobei der Katheter gezeigt ist, der
den Stent in Position hält, wenn die Hülse sich aus dem
Körpergefäß herausbewegt;
Fig. 7 eine Seitenrißansicht eines alternativen Ausführungsbeispiels
des Stents der vorliegenden Erfindung;
Fig. 8 eine Schnittansicht, die entlang der Linie 8-8 in Fig. 7
gemacht wurde;
Fig. 9 eine teilweise perspektivische Ansicht des Stents von Fig.
&iacgr;&ogr; 7, wobei eine Nahtverbindung für den Stent gezeigt ist;
und
Fig. 10 eine perspektivische Ansicht der Spindel, die verwendet
wird, um die Drahthelix der vorliegenden Erfindung zu . bilden.
Während der Anmelder die Erfindung in Zusammenhang mit bevorzugten
alternativen Ausfahrungsbeispielen beschreiben wird, muß verstanden werden, daß die Erfindung nicht auf diese Ausführungsbeispiele beschränkt ist.
Weiterhin sollte verstanden werden, daß die Zeichnungen nicht notwendigerweise maßstabsgetreu sind. An speziellen Stellen kann der
Anmelder Details weggelassen haben, die für ein Verständnis der vorliegenden Erfindung nicht erforderlich sind.
DETAILLIERTE BESCHREIBUNG DER ZEICHNUNGEN
Mit Bezug auf die Zeichnungen zeigt Fig. 1 den mtraluminalen Stent der
vorliegenden Erfindung allgemein bei 10. Dieser Stent umfaßt einen Drahtkörper 11, der aus einem vorbestimmten Drahtstück gemacht ist, das
eine sinus- oder zick-zack-förmige Konfiguration aufweist und eine kontinuierliche Helix mit einer Reihe von verbundenen Spiralen oder Reifen
definiert. Es umfaßt ebenfalls Schlaufenelemente 12, die benachbarte Stücke
der benachbarten Helixreifen verbinden, die helfen, den rohrförmigen Stent zu definieren. Die Schlaufenelmente 12 können alle oder einige der Paare
von benachbarten Stücken verbinden.
Der Drahtkörper 11 ist eine elastische Legierung, die dem Stent radiale
Elastizität verleiht. Vorzugsweise handelt es sich um eine Nitinollegierung, die eine überragende Elastizität und Ermüdungsbeständigkeit aufweist. Der
Draht weist einen runden Qurschnitt auf; aber sein Querschnitt kann auch &iacgr;&ogr; jede Art von Formen haben, beispielsweise dreieckig, viereckig, etc.
Alternativ dazu kann jegliches Material von ausreichender Stärke und Elastizität von den anderen oben identifizierten Eigenschaften den Drahtkörper
bilden, eingeschlossen Edelstahl, Tantal, Titan oder eines aus der großen Vielzahl von Kunststoffen.
Die Schlaufenelemente 12 verbinden benachbarte Stücke von benachbarten
Reifen des Drahtkörpers 11, so daß die benachbarten Stücke sich berühren (siehe Fig. 2 bis 4). Somit erhält jeder Reifen von benachbarten Reifen
Unterstützung, wobei die Umfangsstärke der gesamten Stent-Struktur erhöht wird und das Risiko von Plaquedurchbrechungen minimiert wird. Die
Schlaufenelemente 12 sind Schlingen aus Nahtmaterial, wobei die Enden zusammengebunden sind, um eine Schleife zu bilden. Dieses Material ist
Polypropylenmaterial oder irgendein anderes biokompatibles Material von ausreichender Stärke. Obwohl Nahtmaterial das bevorzugte Verbindungsmittel
darstellt, können andere Verbindungsmittel wie Klammern und Ringe aus Metall oder Kunststoff dieselbe Funktion bereitstellen.
Die Stentstruktur der vorliegenden Erfindung ermöglicht das Zusammendrücken
vor der Implantation in ein menschliches oder tierisches Gefäß. Nach der Implantation springt die Stentstruktur bei Freigabe der
zusammendrückenden Kraft in seine Originalkonfiguration auf (oder weitet
sich selbst auf). Somit sieht es auch in dem implantierten Zustand weiterhin eine Aufweitungskraft vor. Die Struktur sieht Flexibilität vor, die es dem
Stent ermöglicht, der Krümmung des Gefäßes, das ihn aufnimmt, zu folgen.
In den Fig. 7 bis 9 ist ein alternatives Ausführungsbeispiel der vorliegenden
Erfindung gezeigt, das den Drahtkörper und die Nahtverbindungen wie oben beschrieben umfaßt. Diese Alternative umfaßt weiterhin ein prothesisches
Transplantat 13, das innerhalb der zentralen Öffnung des Drahtkörpers
&iacgr;&ogr; angeordnet ist. Das Transplantat 13 ist eine runde offene Röhre, die aus
Polytetrafluorethylen (PTFE), Dacron oder jedem anderen geeigneten biokompatiblen Material gemacht ist. Es weist einen Außendurchmesser auf,
der geringfügig kleiner ist als der Innendurchmesser des Drahtkörpers 11. Ein oder mehrere Reifenelemente verbindet bzw. verbinden das Transplantat
is 13 mit dem Drahtkörper 11 wie in Fig. 9 gezeigt. In Position gebracht,
schließt das Transplantat die diamantartig geformten Öffnungen der Stentstruktur, um weiter die Durchbrechung von Plaque zu minimieren und
den Fluß von Flüssigkeit und zellularen Elementen durch die Struktur zu minimieren,
Alternativ kann das Transplantat 13 um die Außenseite der Drahthelix liegen.
Weiterhin kann das Transplantat 13 co-extensiv mit der Drahthelix sein; oder es kann kürzer als die Drahthelix sein. Schließlich kann das Transplantat 13
eine Vielzahl von Segmenten umfassen, die in der Drahthelix oder um die Außenseite der Helix herum angeordnet sind.
Das Verfahren zur Herstellung des Stents der vorliegenden Erfindung umfaßt
das Biegen eines vorbestimmten Drahtstückes in einer Zick-Zack-Gestalt
zwischen den Stiften 14 der Spindel 15 und um die Spindel herum, wobei somit eine Helix geformt wird (siehe Fig. 10). Der nächste Schritt umfaßt
-7-
das Entfernen der Helix von der Spindel durch Entfernen der Stifte und
Abstreifen der Helix von der Spindel. Das Arbeitsverfahren umfaßt weiterhin das Verbinden von benachbarten Stücken von benachbarten Helixreifen. Ein
Arbeiter macht diese Verbindungen durch das Plazieren einer Schlinge aus Nahtmatrial (oder jeglichen anderen geeigneten Material) um die
Drahtsegmente, die zwei benachbarte Stücke definieren, und durch das Zusammenbinden der Enden der Schlingen um eine Schlaufe zu bilden. Bei
Anwendungen, bei denen der Drahtkörper aus Nitinoldraht ist, umfaßt das Arbeitsverfahren das Befestigen der Enden des Drahtes an der Spindel und
&iacgr;&ogr; das Tempern des Drahtes auf eine vorbestimmte Temperatur (und somit dem
Verleihen eines thermischen Gedächtnisses für die getemperte Gestalt) bevor die Helix von der Spindel entfernt wird.
Das Verfahren des Implantierens des Stents der vorliegenden Erfindung
umfaßt das Zusammendrücken desselben und Plazieren in einer zentralen Bohrung eines Einführungsgerätes 16. Der nächste Schritt umfaßt das
Verbinden des Gerätes 16 mit der Nabe 17 der Hülse 18, die sich zur Implantationsstelle erstreckt. Der nächste Schritt umfaßt die Verwendung eines
Katheters 19, um den zusammengedrückten Stent zu der vorbestimmten Stelle zu schieben und den Stent an dieser Position mit dem Katheter zu halten
und dann die Hülse zu entfernen. Der letzte Schritt umfaßt die Entfernung des Katheters, um es dem Stent zu gestatten, aufzufedern.
Bei Anwendungen, in denen der Drahtkörper aus Nitinolmaterial ist,
verringert der Anwender den Durchmesser des Stents zuerst durch Kühlung, d.h. durch Eintauchen des Stents in Eiswasser. Dieses Kühlen versetzt das
Nitinol in eine martensitische Phase und erleichtert die manuelle Reduktion des Durchmessers und des Einfahrens des Stents in die zentrale Bohrung des
Gerätes 16. Das Gerät 16 und die Hülse 18 halten den Stent bis zur Aufweitung in einer vorbestimmten Stelle zurück. An dieser Stelle im Körper
• » ♦ ·
wärmt Körperflüssigkeit das Nitinol und versetzt es in die austenitische
Phase, die die stabile Phase des Metalls darstellt und die einer voll
geöffneten oder aufgeweiteten Konfiguration des Stents entspricht (auf seinen ursprünglich getemperten Durchmesser).
Während die obige Beschreibung und die Zeichnungen ein Ausführungsbeispiel
und eine Alternative veranschaulichen, sollte verstanden werden, daß die Erfindung natürlich nicht auf diese Ausführungsbeispiele beschränkt ist. Die
Fachleute, an die sich die Erfindung wendet, können andere Modifikationen
&iacgr;&ogr; und andere Ausführungsbeispiele machen, die das Prinzip dieser Erfindung
verwenden, insbesondere unter Berücksichtigung der vorangegangenen Lehren. Beispielsweise kann man ein verformbares Material verwenden, um den
Drahtkörper 11 des Stents zu bilden und dann einen Ballonkatheter, um es
aufzuweiten. Der Anmelder hat daher vor, durch die beigefügten Ansprüche jegliche Modifikation und andere Ausführungsbeispiele abzudecken, die diese
Merkmale umfassen, die die wesentlichen Merkmale der Erfindung darstellen.
Claims (17)
1. Ein intraluminaler Stent umfassend eine Reihe von axial versetzten
&iacgr;&ogr; Reifenelementen, wobei jedes Reifenelement eine aufeinanderfolgende
Reihe von Zick-Zacken aufweist, wobei die Stücke der axial sich gegenüberliegenden Zick-Zacke von benachbarten Reifenelementen einander
berühren und mindestens einige der sich berührenden Reifenelemente aneinander befestigt sind, wobei der Stent zusammendrückbar
is und auf eine Konfiguration vor dem Zusammendrücken aufweitbar ist.
2. Intraluminaler Stent nach Anspruch 1, weiter umfassend eine Klammer
zur Befestigung aneinanderliegender Reifenelemente aneinander.
3. Intraluminarer Stent nach Anspruch 1, weiter umfassend einen metallischen
Ring zur Befestigung aneinanderliegender Reifenelemente aneinander.
4. Intraluminarer Stent nach Anspruch 1, weiter umfassend einen Kunststoffring
zur Befestigung aneinanderliegender Reifenelemente aneinander.
5. Intraluminarer Stent nach Anspruch 1, weiter umfassend zumindestens
ein Schlaufenelement zur Befestigung der aneinanderliegenden Reifenelemente aneinander.
6. Intraluminaler Stent nach Anspruch 1, wobei die Reifenelemente aus
einem durchgehenden Draht gebildet sind.
• ·
• ·
7. [ntraluminaier Stent nach Anspruch 6, wobei das Schlaufenelement eine
Schlinge aus Nahtmaterial ist.
8. Intraluminaler Stent nach Anspruch 5, wobei das Schlaufenelement aus
dem gleichen Konstruktionsmaterial wie die Reifen besteht, hiervon aber getrennt ausgebildet ist.
9. Intraluminaler Stent nach Anspruch 5, wobei die Schlaufenelemente und
Reifen aus Nitinol bestehen.
10. Intraluminaler Stent nach Anspruch 5, wobei mindestens ein Schiaufenelement
nicht Teil der Zick-Zack-Reifenelemente ist.
11. Intraluminaler Stent nach Anspruch 5, wobei das Schlaufenelement eine
is im wesentlichen größere Flexibilität als der Draht aufweist.
12. Intraluminaler Stent nach Anspruch 7, wobei das Nahtmaterial aus
Polypropylen gemacht ist.
13. Intraluminaler Stent entsprechend einem der Ansprüche 1 bis 12, weiter
umfassend ein rohrförmiges Transplantatelement, das an dem Stent befestigt ist.
14. Intraluminaler Stent nach Anspruch 13, wobei das Transplantatelement
innerhalb der Reifenelemente liegt.
15. Intraluminaler Stent nach Anspruch 13, wobei das Transplantatelement
außerhalb der Reifenelemente liegt.
16. intraluminaler Stent nach einem der Ansprüche 13 bis 15, wobei das
Transplantatelement ein Rohr aus Polytetrafluorethylen ist.
17. Intraluminaler Stent nach einem der Ansprüche 13 bis 16, wobei das
Transplantatelement gewebte Polyethylenterephthalatfasern umtaßt.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/839,911 US5405377A (en) | 1992-02-21 | 1992-02-21 | Intraluminal stent |
EP93102673A EP0556850B1 (de) | 1992-02-21 | 1993-02-19 | Instraluminarer Stent |
Publications (1)
Publication Number | Publication Date |
---|---|
DE9321363U1 true DE9321363U1 (de) | 1997-06-19 |
Family
ID=25280956
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69309132T Expired - Lifetime DE69309132T2 (de) | 1992-02-21 | 1993-02-19 | Instraluminarer Stent |
DE9321363U Expired - Lifetime DE9321363U1 (de) | 1992-02-21 | 1993-02-19 | Intraluminaler Stent |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69309132T Expired - Lifetime DE69309132T2 (de) | 1992-02-21 | 1993-02-19 | Instraluminarer Stent |
Country Status (3)
Country | Link |
---|---|
US (1) | US5405377A (de) |
EP (2) | EP0749729A3 (de) |
DE (2) | DE69309132T2 (de) |
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- 1993-02-19 EP EP96112898A patent/EP0749729A3/de not_active Ceased
- 1993-02-19 EP EP93102673A patent/EP0556850B1/de not_active Expired - Lifetime
- 1993-02-19 DE DE9321363U patent/DE9321363U1/de not_active Expired - Lifetime
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EP0749729A2 (de) | 1996-12-27 |
US5405377A (en) | 1995-04-11 |
EP0556850A1 (de) | 1993-08-25 |
EP0556850B1 (de) | 1997-03-26 |
EP0749729A3 (de) | 1997-10-22 |
DE69309132T2 (de) | 1997-07-03 |
DE69309132D1 (de) | 1997-04-30 |
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