DE19906956B4 - Stent and method for producing a stent - Google Patents
Stent and method for producing a stent Download PDFInfo
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- DE19906956B4 DE19906956B4 DE1999106956 DE19906956A DE19906956B4 DE 19906956 B4 DE19906956 B4 DE 19906956B4 DE 1999106956 DE1999106956 DE 1999106956 DE 19906956 A DE19906956 A DE 19906956A DE 19906956 B4 DE19906956 B4 DE 19906956B4
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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
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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
- A61F2/02—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
- A61F2002/065—Y-shaped blood vessels
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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
- A61F2002/91525—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 within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
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- A—HUMAN NECESSITIES
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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
- A61F2/90—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
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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
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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
- A61F2002/91575—Adjacent bands being connected to each other connected peak to trough
-
- 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
- A61F2002/91583—Adjacent bands being connected to each other by a bridge, whereby at least one of its ends is connected along the length of a strut between two consecutive apices within a band
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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
- 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
- A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
- A61F2250/0037—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in height or in length
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Optics & Photonics (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Physics & Mathematics (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
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- Media Introduction/Drainage Providing Device (AREA)
Abstract
Stent, hergestellt durch einen Zuschnitt (10, 20) aus einem Flachmaterial, wobei der Zuschnitt in mehreren Reihen (14) paarweise angeordnete Materialstreifen (11, 12), die über einen Zwischenraum (13) beabstandet und in Randbereichen (17, 18) miteinander verbunden sind, aufweist und ihren wobei die Materialstreifen (11, 12) quer zu einer Mittelachse (16) angeordnet und einander gegenüberliegende Materialstreifen (11, 12) benachbarter Reihen (14) über Stege (15) miteinander verbunden sind, wobei die Materialstreifen (11, 12) zur Herstellung des Stents in leite entgegengesetzten Richtungen herausgebogen einander werden.Stent, produced by a blank (10, 20) made of a flat material, the blank being arranged in several rows (14) in pairs of material strips (11, 12) spaced apart by an intermediate space (13) and in edge regions (17, 18) with one another are connected and their material strips (11, 12) are arranged transversely to a central axis (16) and material strips (11, 12) of adjacent rows (14) lying opposite one another are connected to one another via webs (15), the material strips (11 , 12) are bent out in opposite directions to one another to produce the stent.
Description
Die vorliegende Erfindung betrifft einen Stent, hergestellt durch einen Zuschnitt aus einem Flachmaterial, wobei der Zuschnitt in mehreren Reihen paarweise angeordnete Materialstreifen, die über einen Zwischenraum beabstandet und in ihren Randbereichen miteinander verbunden sind, aufweist, gemäß den Merkmalen im Patentanspruch 1.The present invention relates to a stent, produced by a blank of a flat material, wherein the blank in a plurality of rows of material strips arranged in pairs, which are spaced over a gap and interconnected in their edge regions, having, according to the features in
Die vorliegende Erfindung betrifft weiterhin ein Verfahren zur Herstellung eines Stents gemäß den Merkmalen im Patentanspruch 5. Darüber hinaus betrifft die vorliegende Erfindung einen Stent, hergestellt aus einem Zuschnitt gemäß den Merkmalen im Patentanspruch 9.The present invention further relates to a method for producing a stent according to the features in claim 5. Moreover, the present invention relates to a stent made from a blank according to the features in claim 9.
Stents werden in Blutgefäße des menschlichen Körpers eingesetzt, um diese offen zu halten und insbesondere Herzinfarkte zu vermeiden. Die Stents sind hohlzylindrisch ausgebildet und weisen eine Maschenstruktur auf. Die bekannten Stents werden im Wesentlichen auf zwei unterschiedliche Arten hergestellt.Stents are used in blood vessels of the human body to keep them open and especially to prevent heart attacks. The stents are hollow cylindrical and have a mesh structure. The known stents are manufactured essentially in two different ways.
Bei einer ersten Vorgehensweise wird, wie in der
Aufgabe der vorliegenden Erfindung ist es daher, einen Stent und ein Herstellungsverfahren für einen Stent bereitzustellen, die eine einfache Herstellung ohne Schweißen ermöglichen.The object of the present invention is therefore to provide a stent and a manufacturing method for a stent, which allow a simple production without welding.
Diese Aufgabe wird durch einen Stent mit den Merkmalen von Patentanspruch 1 gelöst. Der verfahrenstechnische Teil der Aufgabe wird weiterhin durch ein Verfahren zur Herstellung eines Stents mit den Merkmalen von Patentanspruch 5 gelöst. Die Aufgabe wird weiterhin durch einen erfindungsgemäßen Stent gemäß Patentanspruch 9 gelöst.This object is achieved by a stent having the features of
Der Zuschnitt für einen Stent besteht aus einem Flachmaterial mit in mehreren Reihen paarweise angeordneten Materialstreifen, die über einen Zwischenraum beabstandet und nur in den Randbereichen miteinander verbunden sind. Die Materialstreifen sind quer zu einer Mittelachse angeordnet. Einander gegenüberliegende Materialstreifen benachbarter Reihen sind über Stege miteinander verbunden.The blank for a stent consists of a flat material with a plurality of rows of material strips arranged in pairs, which are spaced over a gap and interconnected only in the edge regions. The strips of material are arranged transversely to a central axis. Opposing strips of material adjacent rows are connected to each other via webs.
Durch das Herausbiegen der Materialstreifen aus dem Zuschnitt in einander entgegengesetzte Richtungen wird die gewünschte räumliche hohlzylindrische Form erzielt. Ein Verschweißen ist nicht erforderlich, da die Materialstreifen in ihren Randbereichen miteinander verbunden sind.By bending out the strip of material from the blank in opposite directions, the desired spatial hollow cylindrical shape is achieved. Welding is not necessary because the strips of material are connected together in their edge regions.
Es ist möglich die Materialstreifen auch zwischen den Randbereichen zu verbinden. In diesem Fall werden durch das Herausbiegen aus dem Zuschnitt mehrere nebeneinanderliegende und materialeinstückig verbundene Hohlzylinder hergestellt. Diese können anschließend voneinander getrennt und als Stents verwendet werden. Im Prinzip entspricht diese Ausführung einem Anordnen mehrerer Zuschnitte nebeneinander und einem Verbinden der Randbereiche der Materialstreifen.It is possible to connect the strips of material also between the border areas. In this case, by bending out of the blank a plurality of adjacent and material integral hollow cylinder produced. These can then be separated and used as stents. In principle, this embodiment corresponds to arranging several blanks side by side and joining the edge regions of the material strips.
Der Zuschnitt ermöglicht die Herstellung von Stents beliebiger Länge, indem die Anzahl der vorgesehenen Reihen vergrößert wird.The blank allows the production of stents of any length by increasing the number of rows provided.
Die mit den Stegen verbundenen Materialstreifen benachbarter Reihen werden in dieselbe Richtung gebogen. Die Stege ermöglichen eine Verbindung der einzelnen Reihen, ohne daß hierdurch das Herausbiegen der Materialstreifen ineinander entgegengesetzten Richtungen aus dem Zuschnitt behindert wird.The material strips of adjacent rows connected to the webs are bent in the same direction. The webs allow a connection of the individual rows, without this hindering the bending out of the strip of material in opposite directions from the blank.
Zur Herstellung der Zuschnitte können mehrere derartige Flachmaterialien übereinander gestapelt und gleichzeitig bearbeitet werden. Das Schneidwerkzeug verfährt hierbei nur in einer Ebene. Die Herstellung der Zuschnitte gestaltet sich somit einfach und kostengünstig.To produce the blanks, a plurality of such flat materials can be stacked on top of one another and processed at the same time. The cutting tool moves only in one plane. The production of the blanks is thus simple and inexpensive.
Gemäß einer vorteilhaften Weiterbildung verlaufen die Materialstreifen jeder Reihe im wesentlichen parallel zueinander. Hierdurch wird die Fertigung vereinfacht, da das Schneidgerät zur Herstellung des Zuschnitts stets dieselbe Kurve abfahren kann.According to an advantageous development, the material strips of each row run substantially parallel to one another. As a result, the production is simplified, since the cutter for producing the blank can always run the same curve.
Nach einer vorteilhaften Weiterbildung sind die Materialstreifen mäanderförmig ausgebildet. Die mäanderförmige Ausbildung erhöht die Berührfläche zwischen dem Stent und der Innenseite der Ader und verbessert so die Abstützwirkung. Gleichzeitig werden Zwischenräume zwischen den einzelnen Materialstreifen und den Reihen durch die mäanderförmige Ausbildung überdeckt, so daß unzulässig große Maschen in dem Stent vermieden werden.According to an advantageous development, the material strips are formed meander-shaped. The meandering design increases the contact area between the stent and the inside of the vein and thus improves the supporting action. At the same time gaps between the individual strips of material and the rows are covered by the meandering training, so that impermissibly large meshes are avoided in the stent.
In vorteilhafter Ausgestaltung weist der Zuschnitt einen Basisbereich und einen sich daran anschließenden Gabelungsbereich auf, wobei der Gabelungsbereich mindestens zwei nebeneinander liegende Abschnitte mit den paarweise angeordneten Materialstreifen aufweist. Dieser Zuschnitt ermöglicht die Herstellung eines Y-förmigen Stents. Die beiden Abschnitte des Gabelungsbereichs werden durch Herausbiegen der jeweiligen Materialstreifen aus dem Zuschnitt zu voneinander getrennten Hohlzylindern geformt. Beide Abschnitte sind mit dem Gabelungsbereich verbunden, der ebenfalls in die gewünschte hohlzylindrische Form gebracht wird. Der entstandene Y-förmige Stent ist ohne Schweißen oder komplizierte Bearbeitungsvorgänge hergestellt. Ein derartiger Stent wird zur Behandlung von Ablagerungen in Verzweigungen von Blutgefäßen eingesetzt. Bisher wurden hierfür zwei voneinander getrennte Stents verwendet. Nach dem Einsetzen des ersten Stents mußte der zweite Stent möglichst genau gegenüber dem ersten Stent in der Verzweigung plaziert werden. Die erforderliche Genauigkeit läßt sich allerdings kaum erreichen. Die bekannten Stents können daher eine Behandlung der Ablagerungen in Verzweigungen von Blutgefäßen nicht zuverlässig sicherstellen. Der erfindungsgemäße Y-förmige Stent weist drei materialeinstückig miteinander verbundene hohlzylindrische Abschnitte auf. Er wird in einem Arbeitsgang in die Verzweigung eingesetzt, so dass Ablagerungen optimal behandelt werden können.In an advantageous embodiment, the blank has a base region and an adjoining fork region, wherein the Fork region has at least two adjacent sections with the pairs of strips of material. This blank enables the production of a Y-shaped stent. The two sections of the crotch area are formed by bending out the respective strips of material from the blank to separate hollow cylinders. Both sections are connected to the fork area, which is also brought into the desired hollow cylindrical shape. The resulting Y-shaped stent is made without welding or complicated machining operations. Such a stent is used to treat deposits in branches of blood vessels. So far, two separate stents have been used for this purpose. After insertion of the first stent, the second stent had to be placed as close as possible to the first stent in the branch. However, the required accuracy can hardly be achieved. Therefore, the known stents can not reliably ensure a treatment of the deposits in branches of blood vessels. The Y-shaped stent according to the invention has three hollow-cylindrical sections connected to one another in material terms. It is used in one operation in the branch, so that deposits can be treated optimally.
Auch der Basisbereich weist die paarweise angeordneten Materialstreifen auf. Auf diese Weise können die Abschnitte des Gabelungsbereichs und der Basisbereich gleichzeitig oder nacheinander durch Herausbiegen der Materialstreifen aus dem Zuschnitt hergestellt werden.Also, the base area has the pairs of strips of material. In this way, the portions of the crotch area and the base area can be made simultaneously or sequentially by bending out the strips of material from the blank.
Das erfindungsgemäße Verfahren zur Herstellung eines Stents unter Verwendung eines oben beschriebenen Zuschnitts sieht vor, dass einer der beiden Materialstreifen einer Reihe in einer ersten Richtung und der andere Materialstreifen dieser Reihe in entgegengesetzter Richtung aus dem Zuschnitt herausgebogen wird. Hierdurch wird auch bei Verwendung eines Flachmaterials als Zuschnitt die gewünschte hohlzylindrische Form für den Stent erreicht.The inventive method for producing a stent using a blank as described above provides that one of the two strips of material in one row in a first direction and the other strip of material in this row is bent out of the blank in the opposite direction. As a result, the desired hollow cylindrical shape for the stent is achieved even when using a flat material as a blank.
Vorteilhaft werden die mit den Stegen verbundenen Materialstreifen benachbarter Reihen in dieselbe Richtung gebogen. Hierdurch wird die Herstellung des Zuschnitts und des Stents erleichtert.Advantageously, the material strips of adjacent rows connected to the webs are bent in the same direction. This facilitates the manufacture of the blank and the stent.
In vorteilhafter Weiterbildung wird nach dem Herausbiegen der Materialstreifen eine Wärmebehandlung zum Abbau von Spannungen vorgenommen. Diese Wärmebehandlung erhöht die Belastbarkeit und Verformbarkeit des fertigen Stents und verhindert Risse oder Sprünge insbesondere in den Randbereichen.In an advantageous embodiment, a heat treatment for the reduction of stresses is made after bending out the strip of material. This heat treatment increases the resilience and deformability of the finished stent and prevents cracks or cracks, especially in the edge regions.
Nach einer vorteilhaften Ausgestaltung wird eine Oberflächenbehandlung, insbesondere ein Elektropolieren, vorgenommen. Diese Oberflächenbehandlung entfernt eventuell vorhandene Verunreinigungen und erhöht die Körperverträglichkeit der Stents und verwundet durch Abtragen von Material.According to an advantageous embodiment, a surface treatment, in particular an electropolishing, made. This surface treatment removes any impurities present and increases the body compatibility of the stents and wounded by removal of material.
Die Erfindung stellt weiter einen Stent bereit, der eine Verzweigung aufweist, insbesondere Y-förmig mit zwei rohrförmigen Ansätzen, ausgebildet ist. Dieser Stent wird in Verzweigungen von Blutgefäßen eingesetzt.The invention further provides a stent having a branch, in particular Y-shaped with two tubular extensions, is formed. This stent is used in branches of blood vessels.
In vorteilhafter Weiterbildung weisen die beiden Ansätze unterschiedliche Längen und/oder unterschiedliche Durchmesser auf. Hierdurch wird eine optimale Anpassung an die Verzweigung des Blutgefäßes, in das der Stent eingesetzt werden soll, erreicht.In an advantageous development, the two approaches have different lengths and / or different diameters. This achieves optimal adaptation to the branching of the blood vessel into which the stent is to be inserted.
Nachstehend wird die Erfindung anhand von Ausführungsbeispielen näher beschrieben, die in schematischer Weise in der Zeichnung dargestellt sind. Dabei zeigt:The invention will be described in more detail below with reference to exemplary embodiments, which are shown schematically in the drawing. Showing:
Der Zuschnitt
Zur Herstellung werden die Materialstreifen
Die Materialstreifen
Es können mehrere Zuschnitte
Die
Der für einen erfindungsgemäßen Stent Zuschnitt
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DE1999106956 DE19906956B4 (en) | 1999-02-19 | 1999-02-19 | Stent and method for producing a stent |
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DE10044043A1 (en) * | 2000-08-30 | 2002-03-14 | Biotronik Mess & Therapieg | Repositionable stent |
US20040093056A1 (en) | 2002-10-26 | 2004-05-13 | Johnson Lianw M. | Medical appliance delivery apparatus and method of use |
US7169177B2 (en) * | 2003-01-15 | 2007-01-30 | Boston Scientific Scimed, Inc. | Bifurcated stent |
US7637934B2 (en) | 2003-03-31 | 2009-12-29 | Merit Medical Systems, Inc. | Medical appliance optical delivery and deployment apparatus and method |
WO2006033126A1 (en) * | 2004-09-24 | 2006-03-30 | Invatec S.R.L. | Assembly for the treatment of bifurcations |
DE102016117398B4 (en) | 2016-09-15 | 2023-07-13 | Universität Rostock | Expandable structure |
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