DE10103000B4 - Radially re-expandable vascular support - Google Patents
Radially re-expandable vascular support Download PDFInfo
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- DE10103000B4 DE10103000B4 DE2001103000 DE10103000A DE10103000B4 DE 10103000 B4 DE10103000 B4 DE 10103000B4 DE 2001103000 DE2001103000 DE 2001103000 DE 10103000 A DE10103000 A DE 10103000A DE 10103000 B4 DE10103000 B4 DE 10103000B4
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- vascular support
- radially expandable
- support according
- expandable vascular
- ring elements
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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
- 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
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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
- 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
- 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
- A61F2002/91533—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 characterised by the phase between adjacent bands
- A61F2002/91541—Adjacent bands are arranged out of phase
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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
- 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
-
- 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
- A61F2002/91591—Locking connectors, e.g. using male-female connections
-
- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0002—Two-dimensional shapes, e.g. cross-sections
- A61F2230/0028—Shapes in the form of latin or greek characters
- A61F2230/0054—V-shaped
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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
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/0071—Additional features; Implant or prostheses properties not otherwise provided for breakable or frangible
-
- 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
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
- A61F2250/0082—Additional features; Implant or prostheses properties not otherwise provided for specially designed for children, e.g. having means for adjusting to their growth
Abstract
Radial aufweitbare Gefäßstütze (1), welche eine Vielzahl von miteinander flexibel verbundenen zickzackförmigen Ringelementen (2, 3) aufweist, welche eine Gefäßstütze (1) mit einem proximalen und einem distalen Ende und einer Längsachse definieren, wobei zickzackförmige Ringelemente (2, 3), oder Teile davon in einer Vielzahl senkrecht entlang der Längsachse der Gefäßstütze nebeneinander angeordnet sind, die jeweils durch omegaförmige Stege (7) miteinander verbunden sind, dadurch gekennzeichnet, daß zwischen einzelnen Teilstücken (8, 9), bestehend aus zickzackförmigen Ringelementen (2, 3) und omegaförmigen Stegen (7), und weiteren Teilstücken (8, 9) jeweils längs einer Wachstumsfuge (10) Verbindungsstellen (12) angeordnet sind, die durch eine auflösbare, durch Ösen (16) geführte Verbindung aus einem resorbierbaren Faden (17) oder resorbierbaren Metalldraht nur zeitlich begrenzt fest miteinander verbunden sind.Radial expandable vascular support (1), which a plurality of flexibly connected zigzag ring elements (2, 3) having a vascular support (1) with a proximal and a distal end and a longitudinal axis define, being zigzag-shaped Ring elements (2, 3), or parts thereof in a plurality of vertical along the longitudinal axis the vascular support next to each other are arranged, each by omega-shaped webs (7) with each other are connected, characterized in that between individual sections (8, 9), consisting of zigzag Ring elements (2, 3) and omega-shaped Webs (7), and further sections (8, 9) each longitudinally a growth joint (10) connecting points (12) are arranged, by a resolvable, through eyelets (16) guided Compound of a resorbable thread (17) or resorbable Metal wire only temporarily connected firmly together.
Description
Die Erfindung betrifft eine radial wieder aufweitbare Gefäßstütze zur Verwendung zum Offenhalten von Blutgefäßen oder sonstigen Organwegen in noch wachsenden menschlichen oder tierischen Körpern. Gefäßstützen (Stents) werden allgemein zur dauerhaften Stützung der Gefäßwand im Bereich von Stenosen implantiert. Sie werden auf einen zusammengefalteten Ballon aufgepreßt und im Gefäß durch Ballondilatation auf einen bestimmten Durchmesser aufgedehnt.The The invention relates to a radially expandable vascular support for Use for keeping open blood vessels or other organs in still growing human or animal bodies. Vascular supports (stents) are generally used for permanent support of the vessel wall in the Area implanted by stenoses. They are folded on one Balloon pressed on and in the vessel by balloon dilatation stretched to a certain diameter.
Da bei Kindern aber der maximal einführbare Katheterdurchmesser von einem Ballonkatheter mit montiertem Stent durch den limitierten Durchmesser der Zugangsgefäße, der Femoralarterie oder der Femoralvene, begrenzt ist, kann der Stent nur aus 6 bis maximal 8 Zick-Zacksegmenten in der Zirkumferenz bestehen, so daß er sich nur bis auf einen Durchmesser von maximal 6-8 mm aufdehnen läßt. Da aber beispielsweise der Durchmesser einer Lungenarterie im Erwachsenenalter bis zu 25 mm betragen kann, müssten herkömmliche Stents mit relativ zu kleinem Durchmesser im Laufe des Wachstums wieder chirurgisch mit einer Operation an der Herz-Lungenmaschine entfernt werden.There in children but the maximum insertable catheter diameter from a balloon catheter with mounted stent by the limited Diameter of the access vessels, the Femoral artery, or the femoral vein, is limited, the stent may consist of only 6 to a maximum of 8 zigzag segments in the circumference, so he expand only to a maximum diameter of 6-8 mm leaves. But because, for example the diameter of a pulmonary artery in adulthood up to 25 mm may have to conventional Stents with relatively small diameter in the course of growth again surgically with an operation on the heart lung machine be removed.
Gefäßstützen mit
Nahtverbindungen zwischen zickzackförmigen Drahtgerüsten sind
von C. Gianturco und von Cragg schon länger bekannt. In der Patentschrift
In
der Patentschrift
In
der Patentschrift
Von weiteren Versuchen berichtete Ch. Mullins vom Texas Children's Hospital auf dem Deutschen Kinderkardiologenkongreß 1998 mit modifizierten Palmaz-Stents. Dieser Stent besteht aus einem Rohr mit abwechselnd angeordneten Längsschnitten. Diese Stege werden in Längsrichtung durchtrennt und segmentweise, durch Fäden wieder verbunden. Bei der Aufdehnung werden die einzelnen Segmente v-förmig auseinandergezogen, wobei durch scharfe Kanten der Faden reißen kann. Nachteilig an dieser Ausführung ist auch, daß sich Stegsegmente durch den Schlupf des Fadens überlappen können und deshalb beim Crimpen (Zusammenpressen) auf einem Ballon nicht sicher halten. Dies kann zu einem Abgleiten und dem Verlust des Stents im Gefäßsystem führen mit der Notwendigkeit einer chirurgischen Entfernung. Ferner können sich die Stegsegmente verschieben oder, was besonders bei kurvigem Gefäßverlauf eine große Gefahr darstellt, verkanten. Wegen seiner starren Schlitzkonstruktion ist der Palmaz-Stent ebenfalls sehr rigide und wenig flexibel, was die Einführung bei kurvigem Gefäßverlauf erschwert oder unmöglich macht.From Ch. Mullins of the Texas Children's Hospital reported on further trials German Pediatric Cardiology Congress 1998 with modified Palmaz stents. This stent consists of a tube with alternately arranged Longitudinal sections. These webs are severed in the longitudinal direction and in segments, through threads connected again. Upon expansion, the individual segments become V-shaped pulled apart, which can tear through sharp edges of the thread. A disadvantage of this design is also that Web segments can overlap due to the slippage of the thread and therefore during crimping (Compressing) on a balloon not sure hold. This can be too slipping and loss of the stent in the vascular system to lead with the need for surgical removal. Furthermore, they can move the bridge segments or, especially with curvy vessel course a big Danger, tilt. Because of its rigid slot construction The Palmaz Stent is also very rigid and not very flexible, which the introduction difficult with curvy course of the vessel or impossible power.
Die WO 00/62708 A1 offenbart einen aus mehreren Abschnitten aufgebauten Stent. Die einzelnen Abschnitte sind zylinderförmig aufgebaut und durch auflösbare Verbindungen in Längsrichtung miteinander verbunden. Nachteilig bei diesem Stent ist, daß er nicht radial aufweitbar ist und sich dem Wachstum des Blutgefäßes anpaßt.The WO 00/62708 A1 discloses a multi-section structure Stent. The individual sections are cylindrically structured and by dissolvable connections longitudinal connected with each other. The disadvantage of this stent is that he does not is radially expandable and adapts to the growth of the blood vessel.
In
der
Aus
der
Die erfindungsgemäße flexible radial reexpandierbare Gefäßstütze weist diese Nachteile nicht auf. Diese gitterförmige Gefäßstütze besteht aus mindestens zwei oder mehreren rohrförmigen Teilstücken mit einer zickzackförmigen Ringstruktur von geringer Breite mit einer oder mehreren Wachstumsfugen, die untereinander zeitlich befristet fest miteinander verbunden sind.The inventive flexible radially expandable vascular support does not have these disadvantages. This grid-shaped vascular support consists of at least two or more tubular part pieces with a zigzag-shaped ring structure of small width with one or more growth joints, which are mutually fixed with each other for a limited time.
Die Verbindungen der einzelnen Teilstücke mit beispielsweise resorbierbarem chirurgischem Nahtmaterial soll sich nach einem definiertem Zeitraum auflösen und ein weiteres Wachstum des Gefäßes erlauben, was auch durch eine erneute Ballondilatation oder die Implantation einer weiteren Gefäßstütze mit größerem Durchmesser unterstützt werden kann.The Connections of the individual sections with, for example, resorbable Surgical sutures should become available after a defined period of time dissolve and allow further growth of the vessel, also through another balloon dilatation or the implantation of another Vascular support with larger diameter supports can be.
Aufgabe der vorliegenden Erfindung ist es, eine radial aufweitbare Gefäßstütze zu schaffen, die während ihrer Aufweitung keine oder nur eine geringe Verkürzung erfährt, und bei besserer Kurvengängigkeit weniger leicht knickt und eine ausreichende Radialfestigkeit aufweist und nach Auflösen des Verbindungsmaterials durch Zerfallen in die Einzelteile erneut dilatiert werden kann.task the present invention is to provide a radially expandable vascular support, the while their expansion no or only a slight reduction undergoes, and with better cornering kinks less easily and has sufficient radial strength and after dissolving the connecting material by disintegrating into the items again can be dilated.
Diese Aufgabe wird durch eine radial expandierbare Gefäßstütze mit den Merkmalen von Patentanspruch 1 gelöst.These The object is achieved by a radially expandable vascular support with the features of claim 1 solved.
Kernpunkt ist hierbei, daß zwischen einzelnen Teilstücken, bestehend aus zickzackförmigen Ringelementen und omega-förmigen Stegen, und weiteren Teilstücken jeweils längs einer Wachstumsfuge Verbindungsstellen angeordnet sind, die durch eine auflösbare, durch Ösen geführte Verbindung aus einem resorbierbaren Faden oder resorbierbaren Metalldraht nur zeitlich begrenzt fest miteinander verbunden sind.crux Here is that between individual sections, consisting of zigzag ring elements and omega-shaped Webs, and other parts each longitudinally a growth joint connecting points are arranged by a resolvable, through eyelets guided Compound of a resorbable thread or resorbable metal wire only for a limited time are firmly connected.
Vorteilhafte Ausführungsformen und Weiterbildungen des Erfindungsgedankens sind Gegenstand der abhängigen Patentansprüche 2 bis 14.advantageous embodiments and further developments of the inventive concept are the subject of dependent claims 2 to 14.
Durch besondere Ausführungsformen werden den speziellen Anforderungen jeweils Rechnung getragen. Statt parallelen Stegen, auf denen der Faden verrutschen kann, werden bei dieser Gefäßstütze im Bereich der Verbindungsstellen jeweils ein bis drei, vorzugsweise jeweils drei gegenüberliegende kreisrunde, spezialpolierte und abgerundete Löcher und/oder kleine V-förmigen Fugen zur Fadenaufnahme vorgesehen. Um das Überlappen der Teilstücke beim Crimpen zu verhindern, werden die Verbindungsstellen in Längsrichtung jeweils erfindungsgemäß als Nut- und Federverbindung ausgestaltet. Durch diese Nut- und Federverbindung wird erstmals ein seitliches Verschieben ausgeschloßen und ein sicheres enganliegendes Crimpen des zusammengenähten Stents auf einem Ballon ohne eine weitere Überlappung möglich. Damit verringert sich wesentlich die Gefahr eines unbeabsichtigten Stentverlustes bei der Implantation.By special embodiments The special requirements are taken into account. Instead of parallel webs on which the thread can slip, be in the case of this stent in the area the connecting points in each case one to three, preferably in each case three opposite circular, Specially polished and rounded holes and / or small V-shaped joints provided for thread take-up. To the overlapping of the pieces in the To prevent crimping, the joints are longitudinal each according to the invention as groove and spring connection designed. Through this tongue and groove connection For the first time a lateral shift is excluded and a secure tight-fitting crimping of the stitched stent on a balloon without another overlap possible. In order to Significantly reduces the risk of unintentional stent loss implantation.
Die Fadenverbindung besteht vorzugsweise aus einem resorbierbarem Faden oder Reineisen- oder Wolframdraht.The Thread connection is preferably made of a resorbable thread or pure iron or tungsten wire.
Bei dieser erfindungsgemäßen Gefäßstütze sind zickzackförmige Ringelemente untereinander jeweils mit omegaförmigen Stegen verbunden, die sich bei radialer Aufweitung der Gefäßstütze entsprechend der seitlichen Verkürzung der zickzackförmigen Ringelemente in der Längsachse strecken und so eine Gesamtverkürzung der Gefäßstütze vermeiden oder verringern.at this vascular support according to the invention are zigzag Ring elements interconnected with each other with omega-shaped webs, the at radial expansion of the vascular support according to the lateral shortening the zigzag Ring elements in the longitudinal axis stretch and so a total shortening Avoid the vascular support or decrease.
Bei einer weiteren Ausführungsform sind die bogenförmigen Stege erfindungsgemäß bei einem oder mehreren Ringelementen jeweils paarweise in gegensätzlicher Richtung angeordnet, so daß sich ein sternförmiges Aussehen ergibt. Dadurch ergibt sich trotz hoher Flexibilität durch die multizelluläre Struktur eine hohe Radialfestigkeit, die durch spiralige oder abwechselnde Anordnung von einem oder mehreren sternförmigen Segmenten noch erhöht wird. Auch durch derartige Ausbildungen wird das Biegeverhalten der Gefäßstütze insgesamt weiter beeinflußt.at a further embodiment are the arcuate ones Webs according to the invention in one or several ring elements in pairs in opposite directions Direction arranged so that a star-shaped Appearance. This results in spite of high flexibility by the multicellular structure a high radial strength caused by spiral or alternating Arrangement of one or more star-shaped segments is still increased. Also by such training, the bending behavior of the vascular support is a total further influenced.
Der omega- oder bogenförmige Steg zwischen den einzelnen Ringelementen weist vorzugsweise einen etwas geringeren Querschnitt auf (ca. 30%), als der gerade Steg der zickzackförmigen Ringelemente. Auch sind zahlreiche Kombinationsmöglichkeiten mit den verschiedenen Verbindungsstegen denkbar.Of the omega-shaped or arcuate The web between the individual ring elements preferably has one slightly smaller cross section (about 30%) than the straight bridge the zigzag Ring elements. There are also numerous possible combinations with the different ones Connecting bars conceivable.
Zur Verbesserung der Stützeigenschaften und Radialfestigkeit im Randbereich kann die Gefäßstütze an beiden Enden eine größere Stegbreite aufweisen.to Improvement of support properties and Radial strength in the edge area allows the vascular support at both ends a larger bridge width exhibit.
Zur Verbesserung der lokalen Stützeigenschaften im Bereich einer fokalen Gefäßverengung und der Radialfestigkeit kann die Gefäßstütze auch nur im Mittelbereich eine größere Stegbreite und/oder eine größeren Querschnitt und/oder mehr bogenförmige Verbindungstege aufweisen. Der größere Querschnitt im Mittelbereich kann z. B. durch eine weniger Material abtragende Elektropolitur erreicht werden.to Improvement of local support characteristics in the area of a focal vasoconstriction and Radial strength, the vascular support can only in the middle range a larger bridge width and / or a larger cross-section and / or more arcuate Have connecting webs. The larger cross section in the middle area can z. B. by a less material-removing electropolishing be achieved.
Es können auch mehrere Wachstumsfugen vorgesehen werden. Bei mehreren längs-parallelen Wachstumsfugen kann die Haftung des gekrimpten Stents auf dem Ballon eingeschränkt sein. Deshalb ist es vorteilhaft, die Wachstumsfugen auch längs, quer, schräg, spiralig, v-förmig oder zickzackförmig anzuordnen oder als Kombination von einzelnen Formen dieser Variationen.It can Also, several growth joints are provided. For several longitudinally parallel growth joints The adhesion of the crimped stent to the balloon may be limited. Therefore, it is advantageous, the growth joints also longitudinal, transverse, aslant, spiral, v-shaped or zigzag or as a combination of individual forms of these variations.
Als Material für die Gefäßstütze kann vorzugsweise eines oder mehrere biokompatible Metalle der Gruppe Eisen, Stahl, Wolfram, Niob, Platin, Titan, einer Legierung aus Nickel-Titan, oder einer Legierung mit mindestens einem dieser Metalle, wie Platin-Iridium mit jeweils geeigneten Gewichtsprozenten, verwendet werden. Soll die Gefäßstütze selbstexpandierbar sein, wird vorzugsweise eine durch Wärmebehandlung temperaturoptimierte Nickel-Titanlegierung verwendet.The material for the vascular support may preferably be one or more biocompatible metals the group iron, steel, tungsten, niobium, platinum, titanium, an alloy of nickel-titanium, or an alloy with at least one of these metals, such as platinum-iridium, each with suitable weight percentages can be used. If the vascular support is to be self-expandable, a nickel-titanium alloy which is temperature-optimized by heat treatment is preferably used.
Das Metall kann zur Verbesserung des Einwachsens in die Gefäßwand mit einem biokompatiblen Material oder mit geeigneten Medikamenten zur Vermeidung von Hyperproliferation der Gefäßwand beschichtet sein oder durch Bestrahlung oder radioaktiven Zerfall eine Strahlung freisetzen.The Metal can help improve the ingrowth into the vessel wall a biocompatible material or with appropriate medicines for avoidance coated by hyperproliferation of the vessel wall or by irradiation or radioactive decay radiation release.
Ferner kann die Gefäßstütze auch aus resorbierbaren Kunststoffen, z. B. aliphatischen Polyestern wie Polydioxanon, bestehen.Further can the vascular support too from resorbable plastics, eg. For example, aliphatic polyesters like polydioxanone.
Die rohrförmigen Körper aus Metall oder Kunststoff werden vorzugsweise aus nahtlos gezogenen Rohren gebildet, um Verspannungen und Risse zu vermeiden, wie das im Bereich von Schweißnähten der Fall wäre. Die Strukturen werden vorzugsweise durch Laserstrahl- oder Wasserstrahlschneiden, Elektroerosion und Elektropolitur hergestellt.The tubular body made of metal or plastic are preferably made of seamlessly drawn Tubes formed to avoid tension and cracks, like that in the area of welds the Case would be. The structures are preferably by laser or water jet cutting, electroerosion and electropolishing.
Nachfolgend werden Ausführungsbeispiele der Erfindung anhand einer Zeichnung weiter erläutert. In der Zeichnung zeigt:following Be exemplary embodiments of Invention explained with reference to a drawing. In the drawing shows:
Die in den Figuren dargestellten Gefäßstützen weisen zickzackförmige Ringelemente mit omegaförmigen Stegen oder sternförmigen Segmenten auf. Ähnlich geformte Verbindungsstege sind aus dem Stand der Technik hinreichend bekannt. Daher werden aus Gründen der Übersichtlichkeit in den Figuren nur Beispiele von abgerollten Gitterstrukturen der rohrförmigen Gefäßstütze oder ein Ausschnitt davon dargestellt.The have in the figures illustrated vascular props zigzag Ring elements with omega-shaped Webs or star-shaped Segments on. Similar molded connecting webs are sufficient from the prior art known. Therefore, for reasons the clarity in the figures, only examples of unrolled lattice structures of tubular Vascular support or a section of it is shown.
In
der in
Die
Verbindungstellen
- 11
- Gefäßstützestent
- 22
- zickzackförmiges Ringelementzigzag-shaped ring element
- 33
- zickzackförmiges Ringelementzigzag-shaped ring element
- 44
- bogenförmiger Stegarched bridge
- 55
- bogenförmiger Stegarched bridge
- 66
- sternförmiges Segmentstar-shaped segment
- 77
- omegaförmiger Stegomega-shaped bridge
- 88th
- Teilstücksection
- 99
- Teilstücksection
- 1010
- Wachstumsfugeepiphyseal
- 1111
- Stegweb
- 1212
- Verbindungsstellejunction
- 13, 1413 14
- Nut- und Federverbindungtongue and spring connection
- 1515
- Kerbescore
- 1616
- Öseeyelet
- 1717
- Fadenverbindungthread link
- 1818
- Nietverbindungrivet
Claims (14)
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DE2001103000 DE10103000B4 (en) | 2001-01-24 | 2001-01-24 | Radially re-expandable vascular support |
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DE10103000B4 true DE10103000B4 (en) | 2007-08-30 |
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