DE29701758U1 - Radially expandable stent for implantation in a body vessel, particularly in the area of a vascular branch - Google Patents

Radially expandable stent for implantation in a body vessel, particularly in the area of a vascular branch

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Publication number
DE29701758U1
DE29701758U1 DE29701758U DE29701758U DE29701758U1 DE 29701758 U1 DE29701758 U1 DE 29701758U1 DE 29701758 U DE29701758 U DE 29701758U DE 29701758 U DE29701758 U DE 29701758U DE 29701758 U1 DE29701758 U1 DE 29701758U1
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Germany
Prior art keywords
stent
radial openings
stent according
enlarged radial
openings
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
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DE29701758U
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German (de)
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Abbott Laboratories Vascular Enterprises Ltd
Original Assignee
Jomed Implantate GmbH
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Publication date
Application filed by Jomed Implantate GmbH filed Critical Jomed Implantate GmbH
Priority to DE29701758U priority Critical patent/DE29701758U1/en
Publication of DE29701758U1 publication Critical patent/DE29701758U1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • A61F2/856—Single tubular stent with a side portal passage
    • 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
    • A61F2/0077—Special surfaces of prostheses, e.g. for improving ingrowth
    • 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
    • A61F2/91—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 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • 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
    • A61F2/91—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 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—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 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/02—Inorganic materials
    • A61L31/022—Metals or alloys
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L31/00—Materials for other surgical articles, e.g. stents, stent-grafts, shunts, surgical drapes, guide wires, materials for adhesion prevention, occluding devices, surgical gloves, tissue fixation devices
    • A61L31/08—Materials for coatings
    • A61L31/082—Inorganic materials
    • A61L31/088—Other specific inorganic materials not covered by A61L31/084 or A61L31/086
    • 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
    • A61F2/91—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 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
    • A61F2/915—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 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes with bands having a meander structure, adjacent bands being connected to each other
    • A61F2002/9155—Adjacent bands being connected to each other
    • A61F2002/91558—Adjacent bands being connected to each other connected peak to peak

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Vascular Medicine (AREA)
  • Public Health (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Transplantation (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Epidemiology (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Surgery (AREA)
  • Prostheses (AREA)

Description

*&iacgr;?1&iacgr;5|&Ggr;^·&agr;&rgr;&idiagr;&idiagr;3&Rgr;&Tgr;<&igr;^&Uacgr;>^&iacgr;^··&tgr;&trade;^ refT-vtww** &iacgr; ?1&iacgr;5|&Ggr;^· &agr; &rgr;&idiagr;&idiagr;3&Rgr;&Tgr;<&igr;^&Uacgr;>^&iacgr;^··&tgr;&trade;^ refT-vtww*

G 9027 DEG 9027 EN

Jomed Implantate GmbHJomed Implants GmbH

Rudolf-Diesel-Straße 29Rudolf-Diesel-Strasse 29

72414 Rangendingen72414 Rangendingen

_zur_to

insbesondere im Bereich einerespecially in the area of

In der Kardiologie werden insbesondere nach Gefäßdilatationen Stents in die Gefäße eingeführt, um erneuten Okklusionen des Gefäßes vorzubeugen. Gefäßverschlüsse können dabei auch im Bereich von Gefäßverzweigungen vorkommen. Nach Dehnung des Gefäßes mittels eines Ballonkatheters muß eventuell der gesamte Verzweigungebereich durch Stents gesichert werden. Bislang werden hierzu herkömmliche Stents (Coil-Stents, Multizellular-Stents oder ähnliche) mit verhältnismäßig kleinen, gleichmäßig verteilten Öffnungen oder Zwischenräumen verwendet, wobei ein erster Stent mit einem Ballonkatheter bis über den Verzweigungsbereich geschoben und aufgeweitet und anschließend ein zweiter Stent im nicht aufgeweiteten Zustand durch eine der Öffnungen oder Zwischenräume des ersten Stents hindurch in das abzweigende Gefäß eingeführt und anschließend ebenfalls aufgeweitet wird. Das Hindurchführen des zweiten Stents durch eine der in der Regel ziemlich engen radialen Öffnungen des ersten Stents ist jedoch häufig nur schwer möglich. Außerdem ]<ann der zweite Stent im Bereich seines Durchtritts durch den ersten Stent nur bedingt aufgeweitet werden. Im Ubergangsbereich der beiden Gefäße bilden die Stents somit einen großen Fließwiderstand. Verzweigungsetellen sind daher wieder besonders anfällig für einen erneuten Gefäßverschluß oder Ursache für Throm-In cardiology, stents are inserted into the vessels, particularly after vascular dilatation, in order to prevent further occlusion of the vessel. Vessel occlusions can also occur in the area of vascular branches. After the vessel has been dilated using a balloon catheter, the entire branching area may have to be secured with stents. To date, conventional stents (coil stents, multicellular stents or similar) with relatively small, evenly distributed openings or spaces have been used for this purpose, whereby a first stent is pushed over the branching area using a balloon catheter and expanded, and then a second stent is inserted in the non-expanded state through one of the openings or spaces of the first stent into the branching vessel and then also expanded. However, it is often difficult to pass the second stent through one of the usually fairly narrow radial openings of the first stent. In addition, the second stent can only be expanded to a limited extent in the area where it passes through the first stent. In the transition area between the two vessels, the stents therefore create a large flow resistance. Branching points are therefore particularly susceptible to renewed vessel occlusion or the cause of thrombosis.

G 9027 DB - 2 -G 9027 DB-2-

bösen. Auch bei Einsatz nur eines Stents im Hauptgefäß im Bereich der Abzweigung des zweiten Gefäßes ist der Fließwiderstand im Abzweigungsbereich durch die kleinen öffnungen oder Zwischenräume der seitherigen Stents groß.Even if only one stent is used in the main vessel in the area of the branch of the second vessel, the flow resistance in the branch area is high due to the small openings or gaps of the previous stents.

Zur Abhilfe dieses Problems schlägt die Erfindung einen radial aufweitbaren Stent zur Implantierung in ein KÖrpe'rgefäß, insbesondere im Bereich einer Gefäßverzweigung, in »Form eines hohlzylindrischen Elements vor, der dadurch gekennzeichnet ist, daß er im aufgeweiteten Zustand mindestens einen Abschnitt mit vergrößerten radialen öffnungen aufweist. Wird ein solcher Stent mit seinem Abschnitt mit vergrößerten radialen öffnungen über die Abzweigungsstelle des zweiten Gefäßes geführt, so ist anschließend ein müheloses Hindurchführen des zweiten Stents durch eine der vergrößerten öffnungen in das zweite Gefäß hinein möglich. Außerdem wird der Blutfluß in das. abzweigende Gefäß an der Durchtrittstelle der beiden Stents bei korrekter Positionierung nicht behindert. Zweckmäßigerweise kann der mindestens eine Abschnitt mit vergrößerten radialen öffnungen hohlzylindrisch sein. Hierdurch vereinfacht sich das Einsetzen des Stents in das Gefäß, da nicht auf eine bestimmte Ausrichtung der radialen öffnungen zu achten ist. Zweckmäßigerweise können dabei die Durchmesser der vergrößerten radialen öffnungen derart bemessen sein, daß durch die öffnungen ein zweiter, nicht aufgeweiteter Stent leicht hindurchführbar ist. Die vergrößerten radialen öffnungen können beispielsweise die Form einer Raute, eines anderen Vielecks, eines Kreises oder einer Ellipse aufweisen. Ein Stent mit solchen öffnungen ist vorzugsweise durch Laserschneiden aus einem nahtlosen Meta11röhrchen herstellbar. Der Stent kann auch mehrere Abschnitte mit vergrößerten radialen öffnungen aufweisen. Dabei kann der Stent vorzugsweise derart ausgebildet sein, daß seine radiale Steifigkeit in dem mindestens einen Abschnitt mit vergrößerten radialen öffnungen der radialen Steifigkeit in den übrigen Abschnitten wenigstens annähernd entspricht. Bei einer bevorzugten Ausgestaltung kannTo remedy this problem, the invention proposes a radially expandable stent for implantation in a body vessel, in particular in the area of a vessel branch, in the form of a hollow cylindrical element, which is characterized in that it has at least one section with enlarged radial openings in the expanded state. If such a stent is guided with its section with enlarged radial openings over the branching point of the second vessel, it is then possible to effortlessly guide the second stent through one of the enlarged openings into the second vessel. In addition, the blood flow into the branching vessel is not impeded at the point where the two stents pass through if they are positioned correctly. The at least one section with enlarged radial openings can expediently be hollow cylindrical. This simplifies the insertion of the stent into the vessel, since there is no need to pay attention to a specific alignment of the radial openings. The diameters of the enlarged radial openings can expediently be dimensioned such that a second, non-expanded stent can easily be passed through the openings. The enlarged radial openings can, for example, have the shape of a rhombus, another polygon, a circle or an ellipse. A stent with such openings can preferably be produced by laser cutting from a seamless metal tube. The stent can also have several sections with enlarged radial openings. The stent can preferably be designed such that its radial stiffness in the at least one section with enlarged radial openings at least approximately corresponds to the radial stiffness in the other sections. In a preferred embodiment,

!"iF^W^'^WW'i'r3^ :!"iF^W^'^WW'i'r 3 ^ :

G 9027 DE - 3 -G 9027 EN - 3 -

eine Hälfte des Stents mit vergrößerten radialen öffnungen versehen sein. Zweckmäßigerweise können im Falle eines Gefäßverzweigungsbereichs beide dort eingesetzte Stents diese Ausgestaltung aufweisen. Nach dem Einsetzen überlagern sich die Bereiche vergrößerter radialer öffnungen der beiden Stents, wodurch sich im Überlagerungsbereich annähernd der gleiche Bedeckungsfaktor der Gefäßwand erzielen läßt wie in den übrigen Gefäßbereichen, in denen die anderen Hälften der Stents mit normaler Größe der radialen öffnungen die Gefäße jeweils alleine aussteifen. Um beim Einsetzen der Stents deren Lage im Gefäß kontrollieren zu können, ist es von Vorteil, wenn der Stent mindestens im Bereich der vergrößerten radialen öffnungen im wesentlichen aus einem bei Röntgendurchstrahlung gut sichtbaren Material gefertigt oder mit einer Beschichtung aus einem solchen Material versehen ist. Der entsprechende Bereich des Stents kann hierzu beispielsweise aus Platin oder Gold gefertigt sein oder eine Gold- oder Platinbeschichtung aufweisen.one half of the stent can be provided with enlarged radial openings. In the case of a vessel branching area, both stents used there can expediently have this design. After insertion, the areas of enlarged radial openings of the two stents overlap, whereby in the overlapping area approximately the same coverage factor of the vessel wall can be achieved as in the other vessel areas in which the other halves of the stents with normal-sized radial openings each stiffen the vessels on their own. In order to be able to check the position of the stents in the vessel when inserting them, it is advantageous if the stent, at least in the area of the enlarged radial openings, is made essentially of a material that is clearly visible under X-rays or is provided with a coating of such a material. The corresponding area of the stent can for example be made of platinum or gold or have a gold or platinum coating.

Nachfolgend wird ein bevorzugtes Ausführungsbeispiel eines erfindungsgemäßen Stents anhand der Zeichnung näher beschrieben. A preferred embodiment of a stent according to the invention is described in more detail below with reference to the drawing.

Im einzelnen zeigen:In detail:

Fig· 1 eine schematische Ansicht einer Gefäßverzweigung mit eingesetzten Stents;Fig. 1 is a schematic view of a vessel branch with inserted stents;

Fig. 2 eine Darstellung der Oberflächenstruktur eines erfindungsgetnäßen Stents in aufgeweitetem Zustand;Fig. 2 shows a representation of the surface structure of a stent according to the invention in the expanded state;

Fig. 3 die Oberflächenstruktur des Stents nachFig. 3 the surface structure of the stent after

Fig. 2 in nicht aufgeweitetem Zustand.Fig. 2 in non-expanded state.

G 9027 DE - 4 -G 9027 EN - 4 -

Fig. 1 zeigt in einer Prinzipdarstellung ein erstes Körpergefäß 10, von dem ein zweites Körpergefäß 11 abzweigt. Im ersten Körpergefäß 10 ist ein erster Stent 12 eingesetzt, der sich bis über den Abzweigungsbereich des Gefäßes 11 erstreckt. Im Inneren des Stents 12 ist ein weiterer Stent 13 eingeführt, der sich mit einem Ende in das zweite Körpergefäß 11 erstreckt. Zur Erleichterung des Einfahrens des inneren, zweiten Stents 13 in das zweite Körpergefäß 11 weist -der erste Stent 12 einen durch gestrichtelte Linien angedeuteten hohlzylindrischen Bereich 14 mit vergrößerten radialen öffnungen auf, durch die der zweite Stent 13 in nicht aufgeweitetem Zustand durchführbar ist.Fig. 1 shows a schematic diagram of a first body vessel 10 from which a second body vessel 11 branches off. A first stent 12 is inserted into the first body vessel 10 and extends beyond the branching area of the vessel 11. A further stent 13 is inserted into the interior of the stent 12 and extends with one end into the second body vessel 11. To facilitate the insertion of the inner, second stent 13 into the second body vessel 11, the first stent 12 has a hollow cylindrical area 14 indicated by dashed lines with enlarged radial openings through which the second stent 13 can be passed in the non-expanded state.

Fig. 2 zeigt die Oberflächenstruktur eines solchen Stents mit vergrößerten radialen öffnungen 15, die im dargestellten Beispiel eine sechseckige Form haben und einen Durchmesser aufweisen, der ein vielfaches größer ist als der Durchmesser der übrigen radialen öffnungen 16. In Fig. 2 ist außerdem der Querschnitt eines zweiten Stents 17 angedeutet, der im radial nicht aufgeweiteten Zustand relativ leicht durch die vergrößerten öffnungen 15 hindurchführbar ist.Fig. 2 shows the surface structure of such a stent with enlarged radial openings 15, which in the example shown have a hexagonal shape and a diameter that is many times larger than the diameter of the other radial openings 16. In Fig. 2, the cross section of a second stent 17 is also indicated, which in the radially non-expanded state can be passed relatively easily through the enlarged openings 15.

Fig. 3 zeigt die Oberflächenstruktur des Stents nach Fig. 2 in radial nicht aufgeweitetem Zustand.Fig. 3 shows the surface structure of the stent according to Fig. 2 in a radially non-expanded state.

Der dargestellte Stent ist lediglich beispielhaft. Anstelle nur eines Bereichs mit vergrößerten radialen öffnungen können auch mehrere solche Bereiche vorgesehen sein. Es ist auch möglich, eine Hälfte des Stents mit radial vergrößerten öffnungen und die andere Hälfte mit radialen öffnungen normaler Größe auszubilden.The stent shown is merely an example. Instead of just one area with enlarged radial openings, several such areas can be provided. It is also possible to design one half of the stent with radially enlarged openings and the other half with radial openings of normal size.

Claims (11)

G 9027 DE - 5 - Schutzansprüche :G 9027 DE - 5 - Protection claims: 1. Radial aufweitbarer Stent zur Implantierung in ein Körpergefäß, insbesondere im Bereich einer Gefäßverzweigung, in Form eines hohl zylindrischen Elements, dadurch gekennzeichnet, daß er im aufgeweiteten Zustand mindestens einen Abschnitt (14) aufweist.1. Radially expandable stent for implantation in a body vessel, in particular in the region of a vessel branch, in the form of a hollow cylindrical element, characterized in that it has at least one section (14) in the expanded state. 2. Stent nach Anspruch 1, dadurch gekennzeichnet, daß der mindestens eine Abschnitt (14) mit vergrößerten radialen öffnungen (15) hohl zylindrisch ist.2. Stent according to claim 1, characterized in that the at least one section (14) with enlarged radial openings (15) is hollow cylindrical. 3. Stent nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Durchmesser der vergrößerten radialen öffnungen (15) derart bemessen ist, daß durch die öffnungen ein zweiter, nicht aufgeweiteter Stent <13, 17) leicht hindurchführbar ist.3. Stent according to claim 1 or 2, characterized in that the diameter of the enlarged radial openings (15) is dimensioned such that a second, non-expanded stent (<13, 17) can easily be passed through the openings. 4. Stent nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die vergrößerten radialen öffnungen (15) die Form einer Raute oder eines anderen Vielecks aufweisen.4. Stent according to one of claims 1 to 3, characterized in that the enlarged radial openings (15) have the shape of a rhombus or another polygon. 5. Stent nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die vergrößerten radialen öffnungen (15) die Form eines Kreises oder einer Ellipse aufweisen.5. Stent according to one of claims 1 to 3, characterized in that the enlarged radial openings (15) have the shape of a circle or an ellipse. 6. Stent nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß seine radiale Steifigkeit in dem mindestens einen Abschnitt (14) mit vergrößerten radialen öffnungen (15) wenigstens annähernd der radialen Steifigkeit in den übrigen Abschnitten entspricht.6. Stent according to one of claims 1 to 5, characterized in that its radial stiffness in the at least one section (14) with enlarged radial openings (15) corresponds at least approximately to the radial stiffness in the remaining sections. G 9027 DE - 6 -G 9027 EN - 6 - 7. Stent nach einem der Ansprüche 1 bis 6f dadurch gekennzeichnet, daß er mehrere Abschnitte (14) mit vergrößerten radialen öffnungen (15) aufweist.7. Stent according to one of claims 1 to 6 f , characterized in that it has several sections (14) with enlarged radial openings (15). 8. Stent nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß eine seiner Hälften mit vergrößerten radialen öffnungen (15) versehen ist.8. Stent according to one of claims 1 to 6, characterized in that one of its halves is provided with enlarged radial openings (15). 9. Stent nach einem der Ansprüche 1 bis 8f dadurch gekennzeichnet, daß er mindestens im Bereich (14) der vergrößerten radialen öffnungen (15) im wesentlichen aus einem bei Röntgendurchstrahlung gut sichtbaren Material gefertigt oder mit einer Beschichtung aus einem solchen Material versehen ist.9. Stent according to one of claims 1 to 8 f , characterized in that it is made at least in the region (14) of the enlarged radial openings (15) essentially of a material which is clearly visible under X-rays or is provided with a coating of such a material. 10. Stent nach Anspruch 9, dadurch gekennzeichnet, daß er mindestens im Bereich (14) der vergrößerten radialen öffnungen (15) aus Platin gefertigt ist oder eine Platinbeschichtung aufweist.10. Stent according to claim 9, characterized in that it is made of platinum or has a platinum coating at least in the region (14) of the enlarged radial openings (15). 11. Stent nach Anspruch 9, dadurch gekennzeichnet, daß er mindestens im Bereich (14) der vergrößerten radialen öffnungen (15) aus Gold gefertigt ist oder eine Goldbeschichtung aufweist.11. Stent according to claim 9, characterized in that it is made of gold or has a gold coating at least in the region (14) of the enlarged radial openings (15).
DE29701758U 1997-02-01 1997-02-01 Radially expandable stent for implantation in a body vessel, particularly in the area of a vascular branch Expired - Lifetime DE29701758U1 (en)

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