WO2004110312A1 - Stent - Google Patents

Stent Download PDF

Info

Publication number
WO2004110312A1
WO2004110312A1 PCT/DE2004/000570 DE2004000570W WO2004110312A1 WO 2004110312 A1 WO2004110312 A1 WO 2004110312A1 DE 2004000570 W DE2004000570 W DE 2004000570W WO 2004110312 A1 WO2004110312 A1 WO 2004110312A1
Authority
WO
WIPO (PCT)
Prior art keywords
stent
ring segments
coupling elements
stent according
section
Prior art date
Application number
PCT/DE2004/000570
Other languages
German (de)
French (fr)
Inventor
Thomas Nissl
Wilhelm Fink
Original Assignee
Alveolus Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alveolus Inc. filed Critical Alveolus Inc.
Publication of WO2004110312A1 publication Critical patent/WO2004110312A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2002/826—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents more than one stent being applied sequentially
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2002/828—Means for connecting a plurality of stents allowing flexibility of the whole structure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/82—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
    • A61F2002/91516—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 the meander having a change in frequency along the band
    • 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
    • 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
    • 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
    • A61F2002/91591—Locking connectors, e.g. using male-female connections

Definitions

  • the invention relates to a stent with a tubular support structure made of axially successive, interconnected ring segments.
  • Stents are used to treat stenoses.
  • Stenoses are congenital or disease-related occlusions or narrowing of tubular body tubes, such as trachea, bronchial tubes, esophagus, bile ducts, urinary tract, aorta and other body vessels.
  • Stenoses are often caused by tumors that press on the body tubes or deposits that close the body tubes.
  • the stenoses can be opened by surgical and non-surgical measures.
  • stents are introduced into the intracorporeal vessel in the area of the stenosis using catheter techniques. There, the stents act as a vascular prosthesis to support the inner walls of the vessel.
  • Stents come in various designs and designs of the scaffold. Frequently used stents have a tubular support structure made of metal, which consists of several ring segments. These are usually formed from wave-like or meandering struts which are endlessly adjoining via arch sections. Ring segments adjacent in the longitudinal direction of the stents are firmly connected via connecting struts. Such a stent is known from EP-B 0 364 787.
  • stents have fixed end diameters and are self-expanding. Other embodiments can be implemented using suitable tools, e.g. Change the diameter of balloons or spreaders to adapt them to the anatomical situation. Furthermore, stents made of a so-called shape memory alloy with a memory effect also belong to the prior art.
  • the most commonly used shape memory alloy is Nitinol, which is a nickel-titanium alloy. A stent made from this changes depending on the temperature from its compressed initial state to its expanded support state.
  • a stent belongs to the prior art with a support structure, at the ends of which several holding elements are formed distributed in the circumferential direction.
  • the stent can be coupled to a positioning element of the insertion catheter via the holding elements.
  • the stent known from DE 199 50 756 A1 has, in the unexpanded state, an articulated structure consisting of a plurality of ring segments which engage in one another in the longitudinal direction and are thus pivotable relative to one another without there being a fixed physical connection between them.
  • the couplings between the individual ring segments are released or separated in order to completely separate the ring segments from one another in the final widening.
  • stenoses rarely have a uniform course. They vary in the local spread, for example the length and in terms of constriction.
  • the stents of the stents often either do not provide the radial forces required to withstand a stenosis sufficiently over a long period of time, or are configured to hinder the function of the vessel. It is therefore desirable to have a flexibly adaptable stent available.
  • the invention is based on the object of providing a stent which can be configured flexibly and which can be advantageously adapted to the respective anatomical conditions with regard to its geometry, in particular its length and / or its support properties.
  • a stent according to the features of claim 1 in which the supporting structure is formed from a plurality of axially successive ring segments and at least two adjacent ring segments can be connected by form-fitting interlocking coupling elements.
  • the stent according to the invention or the ring segments used to form the stent are constructed in the manner of a modular system and can be assembled individually.
  • the stent can be used wherever different lengths and / or different properties, e.g. radial forces or geometries of different strengths should or must be used.
  • a stent can be built or assembled from individual or grouped ring segments to suit the particular application requirements of the stenosis to be treated. A quick response time for specific and specially adapted stents for a patient is possible.
  • the functional adaptation of the stent according to the invention is carried out by combining ring segments with different properties, especially different radial forces. This can be done by combining ring segments with different designs and / or from different materials.
  • the proposed stent also has manufacturing and economic advantages.
  • the overall reject rate can be reduced by using short individual ring segments. For example, a single ring segment is 20 mm long. A complete stent can then be assembled from 6 individual ring segments with a total length of 120 mm. If a ring segment is defective, only this single short ring segment needs to be replaced, whereas the entire stent would be unusable in the case of a support structure formed in one piece.
  • connection of the ring segments via the coupling elements is form-fitting, but has limited articulation. This measure is advantageous for the curve of the stent.
  • the ring segments are connected via interlocking coupling elements.
  • the coupling elements are preferably designed as mutually complementary claw connectors, as provided for in claim 2. Both coupling elements expediently project axially in relation to the ring segments in the longitudinal axis of the stent (claim 3). However, it is also conceivable that in each case one of the coupling elements is formed within the ring segment, so that in each case only one corresponding coupling element projects in the axial direction of the stent. In practice, it can be advantageous to use special end ring segments on the respective free ends of a stent according to the invention, which have coupling elements only on one side in the direction of the center of the stent.
  • the ring segments are positively connected via the coupling elements.
  • the coupling elements have undercut surfaces to produce a stable connection.
  • the undercut surfaces can be curved (claim 4).
  • Straight undercut surfaces (claim 5) are advantageous.
  • a combination of curved undercut surfaces and rectilinear undercut surfaces on the coupling elements is also possible.
  • the coupling elements are supported on one another with the undercut surfaces, so that reliable interlocking coupling of the ring segments to one another is ensured.
  • a number of ring segments can expediently be joined together by connecting struts to form stent sections, as provided for in patent claim 6. Then a number of ring segments are firmly connected by connector struts.
  • the individual sections in turn have coupling elements which enable a positive connection of the ring segments or of the stent sections to one another provided according to the invention.
  • the ring segments are formed from struts which adjoin one another in an undulating manner.
  • a stent according to the invention is preferably made of metal. All deformable medically possible metals or metal alloys can be used, e.g. Stainless steel, cobalt alloys, pure iron or nickel-titanium alloys or other medical implant materials.
  • Figure 1 shows the stent pattern of a stent according to the invention in a
  • FIG. 2 shows a section of the stent pattern according to FIG. 1;
  • FIG. 4 shows a detail from the stent pattern of a further embodiment of a stent
  • FIG. 5 shows an enlarged illustration of the coupling element of the stent according to FIG. 4;
  • FIG. 6 shows a section of the stent pattern of a further embodiment of a stent
  • FIG. 7 also shows the coupling elements of the stent according to FIG. 6 in an enlarged representation.
  • FIG. 1 shows a stent 1 made of metal in the development of its support structure 2.
  • the support structure 2 is tubular. It consists of several successive ring segments 3-16.
  • the ring segments 3-16 have a wave-shaped configuration of struts 18, 19 which are endlessly connected to one another via curved sections 17.
  • the adjacent ring segments 6 and 7 or 12 and 13 are connected by form-fitting interlocking coupling elements 20, 21. It can also be seen that the ring segments 3-6, 7-12 and 13-16 are joined together by connecting struts 22 to form stent sections 23, 24, 25.
  • the connector struts 22 have a V-shaped strut section 26, which is arranged in each case in the space between two axially spaced adjacent ring segments 3-6, 7-12 and 13-16.
  • the embodiments of the stents correspond to the basic structure of a stent 1, as described with reference to FIG.
  • the stents differ in the configuration of their coupling elements, by means of which a releasable positive connection between the ring segments 6 and 7 or 12 and 13 is produced.
  • the coupling elements 20, 21 and 27, 28 and 29, 30 are designed as mutually complementary claw connectors 31, 32 and 33, 34 and 35, 36, respectively. They complement each other in such a way that a positive connection between the ring segments 6 and 7 or 12 and 13 and thus between the stent sections 23, 24, 25 is produced by the mutual engagement.
  • the coupling elements 20, 21 in the embodiment according to FIGS. 1 to 3 are designed as hook-like claw connectors 31, 32 with straight undercut surfaces 37 and curved undercut surfaces 38. Both the claw connector 31 and the claw connector 32 have a finger-shaped hook section 39 , which forms a kind of mouth in which a prong-like abutment section 40 of the respective other claw connector 31 or 32 engages.
  • a recess 42 can also be seen in the connection area 41 of the coupling elements 20. This supports the flexibility of the ring segment 6 or 13 in the connection area 41 and contributes to saving material and weight.
  • the coupling elements 21 are connected at the deepest to the arch section 17 between two struts 18, 19 via a longitudinal section 43 running parallel to the longitudinal axis L of the stent.
  • the coupling elements 27, 28, as described with reference to FIGS. 4 and 5, are also designed as mutually complementary claw connectors 33, 34, the claw connector 33 on the left in the image plane being configured in a fork shape.
  • the right claw connector 34 engages in the fork 44 with its round configured abutment head 45.
  • the undercut surfaces 46, 47 formed on the claw connectors 33, 34 are uniformly curved.
  • a circular recess 48 is provided in the abutment head 45.
  • the recess 48 contributes to saving weight, but can also be used to hold a marker which serves to improve the identification of the stent during the implantation process or afterwards.
  • a further alternative embodiment of coupling elements 29, 30 is shown on the basis of FIGS. 6 and 7, via which a releasable form-fitting connection between two adjacent ring segments 6 and 7 or 12 and 13 of a stent 1 can be established.
  • the coupling elements 29, 30 also have two mutually complementary claw connectors 35, 36 with a trapezoidal configuration.
  • the claw connector 35 has two finger tines 49, 50 with rectilinear undercut surfaces 51, 52 which form a jaw-like recess 53 for a trapezoidal tine 54 of the claw connector 36.
  • the prong 54 engages in the recess 53 and is supported here with its straight undercut surfaces 55, 56.
  • the tine 54 also has a widened base section 57 which merges into a longitudinal section 58 for connection to an arc section 17 between two struts 18, 19.

Abstract

The invention relates to a stent (1) comprising a tubular supporting frame (2) that consists of axially successive interconnected ring segments (3-16). According to the invention, at least two neighboring ring segments (6 and 7 or 12 and 13) are connected by means of coupling elements that positively engage with each other and are embodied as complementary clamping connectors (31, 32). The coupling elements (20, 21) axially protrude from the ring segments (6 and 7; 12 and 13) along the longitudinal axis (L) of the stent. In addition, ring segments (3-6; 7-12; 13-16) can be interlocked by means of fixed connector struts (22) so as to form stent sections (23, 24, 25).

Description

Stent stent
Die Erfindung betrifft einen Stent mit einem tubulären Stützgerüst aus axial aufeinander folgenden, untereinander verbundenen Ringsegmenten.The invention relates to a stent with a tubular support structure made of axially successive, interconnected ring segments.
Stents kommen bei der Behandlung von Stenosen zur Anwendung. Stenosen sind angeborene oder krankheitsbedingt erworbene Verschlüsse oder Verengungen von tubulären Körperröhren, wie beispielsweise Luftröhre, Bronchien, Speiseröhre, Gallengänge, Harnwege, Aorta und andere Körpergefäße. Ursache für Stenosen sind häufig Tumore, die auf die Körperröhren drücken, oder Ablagerungen, welche die Körperröhren verschließen. Die Stenosen können durch operative und nicht operative Maßnahmen geöffnet werden. Bei den nicht operativen Maßnahmen werden Stents durch Kathetertechniken in das intrakorporale Gefäß im Bereich der Stenose eingebracht. Die Stents fungieren dort als Gefäßprothese zur Abstützung der Gefäßinnenwände. Stents are used to treat stenoses. Stenoses are congenital or disease-related occlusions or narrowing of tubular body tubes, such as trachea, bronchial tubes, esophagus, bile ducts, urinary tract, aorta and other body vessels. Stenoses are often caused by tumors that press on the body tubes or deposits that close the body tubes. The stenoses can be opened by surgical and non-surgical measures. In the non-surgical measures, stents are introduced into the intracorporeal vessel in the area of the stenosis using catheter techniques. There, the stents act as a vascular prosthesis to support the inner walls of the vessel.
Stents gibt es in verschiedenartigen Ausführungsformen und Designs des Stützgerüsts. Häufig zum Einsatz gelangende Stents weisen ein tubuläres Stützgerüst aus Metall auf, welches aus mehreren Ringsegmenten besteht. Diese sind üblicherweise aus wellen- bzw. mäanderförmig sich über Bogenab- schnitte endlos aneinander schließende Streben gebildet. In Längsrichtung der Stents benachbarte Ringsegmente sind über Verbinderstreben fest verbunden. Ein derartiger Stent ist aus der EP-B 0 364 787 bekannt.Stents come in various designs and designs of the scaffold. Frequently used stents have a tubular support structure made of metal, which consists of several ring segments. These are usually formed from wave-like or meandering struts which are endlessly adjoining via arch sections. Ring segments adjacent in the longitudinal direction of the stents are firmly connected via connecting struts. Such a stent is known from EP-B 0 364 787.
Viele Stents haben fixierte Enddurchmesser und sind selbstexpandierend. Andere Ausführungsformen lassen sich durch geeignete Werkzeuge, z.B. Ballons oder Spreizer, im Durchmesser verändern, um sie der anatomischen Situation anzupassen. Weiterhin gehören auch Stents aus einer sogenannten Formgedächtnislegierung mit Memoryeffekt zum Stand der Technik. Die am häufigsten verwendete Formgedächtnislegierung ist Nitinol, bei der es sich um eine Nickel-Titan-Legierung handelt. Ein hieraus gefertigter Stent geht temperaturabhängig von seinem komprimierten Ausgangszustand in seinen aufgeweiteten Stützzustand über.Many stents have fixed end diameters and are self-expanding. Other embodiments can be implemented using suitable tools, e.g. Change the diameter of balloons or spreaders to adapt them to the anatomical situation. Furthermore, stents made of a so-called shape memory alloy with a memory effect also belong to the prior art. The most commonly used shape memory alloy is Nitinol, which is a nickel-titanium alloy. A stent made from this changes depending on the temperature from its compressed initial state to its expanded support state.
Im Umfang der DE 100 26 307 A1 zählt ein Stent zum Stand der Technik mit einem Stützgerüst, an dessen Enden in Umfangsrichtung verteilt mehrere Halteelemente ausgebildet sind. Über die Halteelemente kann der Stent mit einem Positionierelement des Einführkatheters gekoppelt werden.In the scope of DE 100 26 307 A1, a stent belongs to the prior art with a support structure, at the ends of which several holding elements are formed distributed in the circumferential direction. The stent can be coupled to a positioning element of the insertion catheter via the holding elements.
Der aus der DE 199 50 756 A1 bekannte Stent weist in nicht expandiertem Zustand einen gelenkigen Aufbau aus mehreren Ringsegmenten auf, die in Längsrichtung ineinander greifen und somit gegeneinander schwenkbar sind, ohne dass eine feste physische Verbindung zwischen ihnen besteht. Im aufgeweiteten Zustand sind die Kopplungen zwischen den einzelnen Ringsegmenten freigesetzt bzw. separiert, um die Ringsegmente in der endgültigen Aufweitung vollständig voneinander zu trennen.The stent known from DE 199 50 756 A1 has, in the unexpanded state, an articulated structure consisting of a plurality of ring segments which engage in one another in the longitudinal direction and are thus pivotable relative to one another without there being a fixed physical connection between them. In the expanded state, the couplings between the individual ring segments are released or separated in order to completely separate the ring segments from one another in the final widening.
Naturbedingt weisen Stenosen jedoch selten einen gleichförmigen Verlauf auf. Sie variieren in der örtlichen Ausbreitung, also beispielsweise der Länge und hinsichtlich der Einschnürkraft. In der Praxis hat sich herausgestellt, dass die Stützgerüste der Stents häufig entweder nicht die erforderlichen Radialkräfte bereitstellen, um einer Stenose ausreichend auch über einen längeren Zeitraum standzuhalten oder aber so konfiguriert sind, dass sie die Funktion des Gefäßes behindern. Es ist daher wünschenswert, einen flexibel anpassbaren Stent zur Verfügung zu haben.By nature, however, stenoses rarely have a uniform course. They vary in the local spread, for example the length and in terms of constriction. In practice, it has been found that the stents of the stents often either do not provide the radial forces required to withstand a stenosis sufficiently over a long period of time, or are configured to hinder the function of the vessel. It is therefore desirable to have a flexibly adaptable stent available.
Der Erfindung liegt ausgehend vom Stand der Technik die Aufgabe zugrunde, einen flexibel gestaltbaren Stent bereit zu stellen, der hinsichtlich seiner Geometrie, insbesondere seiner Länge und/oder seiner Stützeigenschaften in vorteilhafter Weise auf die jeweiligen anatomischen Verhältnisse angepasst werden kann.On the basis of the prior art, the invention is based on the object of providing a stent which can be configured flexibly and which can be advantageously adapted to the respective anatomical conditions with regard to its geometry, in particular its length and / or its support properties.
Die Lösung dieser Aufgabe besteht nach der Erfindung in einem Stent gemäß den Merkmalen von Patentanspruch 1 , bei dem das Stützgerüst aus mehreren axial aufeinander folgenden Ringsegmenten gebildet ist und zumindest zwei benachbarte Ringsegmente durch formschlüssig ineinander greifende Koppelelemente verbindbar sind.This object is achieved according to the invention in a stent according to the features of claim 1, in which the supporting structure is formed from a plurality of axially successive ring segments and at least two adjacent ring segments can be connected by form-fitting interlocking coupling elements.
Der erfindungsgemäße Stent bzw. die zur Bildung des Stents benutzten Ringsegmente sind nach Art eines Baukastensystems aufgebaut und individuell zusammensetzbar. Der Stent kann überall dort zum Einsatz gelangen, wo unterschiedliche Längen und/oder verschiedene Eigenschaften, z.B. verschieden starke Radialkräfte oder Geometrien zum Einsatz kommen sollen oder müssen.The stent according to the invention or the ring segments used to form the stent are constructed in the manner of a modular system and can be assembled individually. The stent can be used wherever different lengths and / or different properties, e.g. radial forces or geometries of different strengths should or must be used.
Ein Stent kann in Anpassung auf die jeweiligen Einsatzanforderungen der zu behandelnden Stenose aus einzelnen oder zu Gruppen zusammengefassten Ringsegmenten aufgebaut bzw. zusammengesetzt werden. Eine schnelle Reaktionszeit für spezifische und speziell angepasste Stents für einen Patienten ist möglich.A stent can be built or assembled from individual or grouped ring segments to suit the particular application requirements of the stenosis to be treated. A quick response time for specific and specially adapted stents for a patient is possible.
Die funktionale Anpassung des erfindungsgemäßen Stents erfolgt durch die Kombination von Ringsegmenten mit unterschiedlichen Eigenschaften, insbesondere voneinander verschiedenen Radialkräften. Dies kann durch die Kombination von Ringsegmenten mit unterschiedlichem Design und/oder aus unterschiedlichen Werkstoffen erfolgen.The functional adaptation of the stent according to the invention is carried out by combining ring segments with different properties, especially different radial forces. This can be done by combining ring segments with different designs and / or from different materials.
Der vorgeschlagene Stent hat auch fertigungstechnische und ökonomische Vorteile. So kann die Ausschussrate insgesamt durch die Verwendung von kurzen einzelnen Ringsegmenten verringert werden. Ein einzelnes Ringsegment ist beispielsweise 20 mm lang. Ein kompletter Stent kann dann aus 6 einzelnen Ringsegmenten mit einer Gesamtlänge von 120 mm zusammengesetzt werden. Ist ein Ringsegment fehlerhaft, braucht nur dieses einzelne kurze Ringsegment ersetzt werden, wohingegen bei einem einstückig ausgebildeten Stützgerüst der gesamte Stent unbrauchbar wäre.The proposed stent also has manufacturing and economic advantages. The overall reject rate can be reduced by using short individual ring segments. For example, a single ring segment is 20 mm long. A complete stent can then be assembled from 6 individual ring segments with a total length of 120 mm. If a ring segment is defective, only this single short ring segment needs to be replaced, whereas the entire stent would be unusable in the case of a support structure formed in one piece.
Die Verbindung der Ringsegmente über die Koppelelemente ist formschlüssig, jedoch begrenzt gelenkig. Diese Maßnahme ist für die Kurvengängigkeit des Stents vorteilhaft.The connection of the ring segments via the coupling elements is form-fitting, but has limited articulation. This measure is advantageous for the curve of the stent.
Die Ringsegmente werden über formschlüssig ineinander greifende Koppelelemente verbunden. Vorzugsweise sind die Koppelelemente als zueinander komplementäre Klauenverbinder ausgebildet, wie dies Patentanspruch 2 vorsieht. Zweckmäßigerweise stehen beide Koppelelemente gegenüber den Ringsegmenten in Stentlängsachse axial vor (Patentanspruch 3). Es ist aber auch denkbar, dass jeweils eines der Koppelelemente innerhalb des Ringsegments ausgebildet ist, so dass jeweils nur ein korrespondierendes Koppelelement in axialer Richtung des Stents vorsteht. In der Praxis kann es vorteilhaft sein, an den jeweiligen freien Enden eines erfindungsgemäßen Stents spezielle End-Ringsegmente anzuwenden, die nur auf einer Seite in Richtung zur Stentmitte Koppelelemente aufweisen.The ring segments are connected via interlocking coupling elements. The coupling elements are preferably designed as mutually complementary claw connectors, as provided for in claim 2. Both coupling elements expediently project axially in relation to the ring segments in the longitudinal axis of the stent (claim 3). However, it is also conceivable that in each case one of the coupling elements is formed within the ring segment, so that in each case only one corresponding coupling element projects in the axial direction of the stent. In practice, it can be advantageous to use special end ring segments on the respective free ends of a stent according to the invention, which have coupling elements only on one side in the direction of the center of the stent.
Über die Koppelelemente werden die Ringsegmente formschlüssig verbunden. Hierzu weisen die Koppelelemente zur Erzeugung einer stabilen Verbindung Hinterschneidungsflächen auf. Die Hinterschneidungsflächen können gekrümmt verlaufen (Patentanspruch 4). Auch geradlinig verlaufende Hinterschneidungs- flächen (Patentanspruch 5) sind vorteilhaft. Möglich ist zudem eine Kombination von gekrümmt verlaufenden Hinterschneidungsflächen und geradlinig verlaufenden Hinterschneidungsflächen an den Koppelelementen. Mit den Hinterschneidungsflächen stützen sich die Koppelelemente aneinander ab, so dass eine zuverlässige formschlüssige Kopplung der Ringsegmente untereinander gewährleistet ist.The ring segments are positively connected via the coupling elements. For this purpose, the coupling elements have undercut surfaces to produce a stable connection. The undercut surfaces can be curved (claim 4). Straight undercut surfaces (claim 5) are advantageous. A combination of curved undercut surfaces and rectilinear undercut surfaces on the coupling elements is also possible. The coupling elements are supported on one another with the undercut surfaces, so that reliable interlocking coupling of the ring segments to one another is ensured.
Zweckmäßigerweise können eine Anzahl von Ringsegmenten durch Verbinderstreben zu Stentabschnitten zusammengeschlossen sein, wie dies Patentanspruch 6 vorsieht. Danach sind eine Anzahl von Ringsegmenten durch Verbinderstreben fest verbunden. Die einzelnen Abschnitte wiederum weisen Koppelelemente auf, die eine erfindungsgemäß vorgesehene formschlüssige Verbindung der Ringsegmente bzw. der Stentabschnitte untereinander ermöglichen.A number of ring segments can expediently be joined together by connecting struts to form stent sections, as provided for in patent claim 6. Then a number of ring segments are firmly connected by connector struts. The individual sections in turn have coupling elements which enable a positive connection of the ring segments or of the stent sections to one another provided according to the invention.
Nach den Merkmalen von Patentanspruch 7 sind die Ringsegmente aus sich wellenförmig endlos aneinander schließenden Streben gebildet. Bevorzugt ist ein erfindungsgemäßer Stent aus Metall gefertigt. Hierbei können alle verformbaren medizinisch möglichen Metalle bzw. Metalllegierungen zum Einsatz gelangen, z.B. Edelstahl, Kobaltlegierungen, Reineisen oder Nickel- Titan-Legierungen oder andere medizinische Implantatmaterialien.According to the features of patent claim 7, the ring segments are formed from struts which adjoin one another in an undulating manner. A stent according to the invention is preferably made of metal. All deformable medically possible metals or metal alloys can be used, e.g. Stainless steel, cobalt alloys, pure iron or nickel-titanium alloys or other medical implant materials.
Die Erfindung ist nachfolgend anhand von Ausführungsbeispielen näher beschrieben. Es zeigen:The invention is described below with reference to exemplary embodiments. Show it:
Figur 1 das Stentmuster eines erfindungsgemäßen Stents in einerFigure 1 shows the stent pattern of a stent according to the invention in a
Abwicklung;Completion;
Figur 2 einen Ausschnitt aus dem Stentmuster gemäß der Figur 1 ;FIG. 2 shows a section of the stent pattern according to FIG. 1;
Figur 3 in vergrößerter Darstellung die Koppelelemente des Stents gemäßFigure 3 in an enlarged view, the coupling elements of the stent
Figur 1 bzw. 2; Figur 4 einen Ausschnitt aus dem Stentmuster einer weiteren Ausführungsform eines Stents;Figure 1 and 2; FIG. 4 shows a detail from the stent pattern of a further embodiment of a stent;
Figur 5 in vergrößerter Darstellung die Koppelelements des Stents gemäß Figur 4;FIG. 5 shows an enlarged illustration of the coupling element of the stent according to FIG. 4;
Figur 6 einen Ausschnitt aus dem Stentmuster einer weiteren Ausführungsform eines Stents undFIG. 6 shows a section of the stent pattern of a further embodiment of a stent and
Figur 7 ebenfalls in vergrößerter Darstellung die Koppelelemente des Stents gemäß der Figur 6.FIG. 7 also shows the coupling elements of the stent according to FIG. 6 in an enlarged representation.
Figur 1 zeigt ein aus Metall gefertigten Stent 1 in der Abwicklung seines Stützgerüstes 2. In der Praxis ist das Stützgerüst 2 tubulär geformt. Es besteht aus mehreren hintereinander folgenden Ringsegmenten 3-16. Die Ringsegmente 3-16 weisen eine wellenförmige Konfiguration aus sich über Bogenab- schnitten 17 endlos aneinander schließenden Streben 18, 19 auf.FIG. 1 shows a stent 1 made of metal in the development of its support structure 2. In practice, the support structure 2 is tubular. It consists of several successive ring segments 3-16. The ring segments 3-16 have a wave-shaped configuration of struts 18, 19 which are endlessly connected to one another via curved sections 17.
Die einander benachbarten Ringsegmente 6 und 7 bzw. 12 und 13 sind durch formschlüssig ineinander greifende Koppelelemente 20, 21 verbunden. Ferner erkennt man, dass die Ringsegmente 3-6, 7-12 und 13-16 durch Verbinderstreben 22 zu Stentabschnitten 23, 24, 25 zusammengeschlossen sind. Die Verbinderstreben 22 weisen einen V-förmig konfigurierten Strebenabschnitt 26 auf, der jeweils in dem Raum zwischen zwei mit axialem Abstand benachbarten Ringsegmenten 3-6, 7-12 und 13-16 angeordnet ist.The adjacent ring segments 6 and 7 or 12 and 13 are connected by form-fitting interlocking coupling elements 20, 21. It can also be seen that the ring segments 3-6, 7-12 and 13-16 are joined together by connecting struts 22 to form stent sections 23, 24, 25. The connector struts 22 have a V-shaped strut section 26, which is arranged in each case in the space between two axially spaced adjacent ring segments 3-6, 7-12 and 13-16.
Die Ausführungsformen der Stents, von denen in den Figuren 4 bis 7 Ausschnitte dargestellt sind, entsprechend vom grundsätzlichen Aufbau einem Stent 1 , wie anhand der Figur 1 beschrieben. Die Stents unterscheiden sich in der Konfiguration ihrer Koppelelemente, durch die eine lösbare formschlüssige Verbindung zwischen den Ringsegmenten 6 und 7 bzw. 12 und 13 hergestellt wird. Die Koppelelemente 20, 21 bzw. 27, 28 und 29, 30 sind als zueinander komplementäre Klauenverbinder 31 , 32 bzw. 33, 34 bzw. 35, 36 ausgebildet. Sie ergänzen sich gegenseitig so, dass eine formschlüssige Verbindung zwischen den Ringsegmenten 6 und 7 bzw. 12 und 13 und damit zwischen den Stentabschnitten 23, 24, 25 durch den gegenseitigen Eingriff erzeugt wird.The embodiments of the stents, of which excerpts are shown in FIGS. 4 to 7, correspond to the basic structure of a stent 1, as described with reference to FIG. The stents differ in the configuration of their coupling elements, by means of which a releasable positive connection between the ring segments 6 and 7 or 12 and 13 is produced. The coupling elements 20, 21 and 27, 28 and 29, 30 are designed as mutually complementary claw connectors 31, 32 and 33, 34 and 35, 36, respectively. They complement each other in such a way that a positive connection between the ring segments 6 and 7 or 12 and 13 and thus between the stent sections 23, 24, 25 is produced by the mutual engagement.
Die Koppelelemente 20, 21 in der Ausführung gemäß den Figuren 1 bis 3 sind als hakenartige Klauenverbinder 31 , 32 ausgebildet mit geradlinig verlaufenden Hinterschneidungsflächen 37 und gekrümmt verlaufenden Hinterschneidungs- flächen 38. Sowohl der Klauenverbinder 31 als auch der Klauenverbinder 32 weisen einen fingerförmigen Hakenabschnitt 39 auf, der eine Art Maul bildet, in dem ein zinkenartiger Widerlagerabschnitt 40 des jeweils anderen Klauenverbinders 31 bzw. 32 eingreift.The coupling elements 20, 21 in the embodiment according to FIGS. 1 to 3 are designed as hook-like claw connectors 31, 32 with straight undercut surfaces 37 and curved undercut surfaces 38. Both the claw connector 31 and the claw connector 32 have a finger-shaped hook section 39 , which forms a kind of mouth in which a prong-like abutment section 40 of the respective other claw connector 31 or 32 engages.
Man erkennt ferner im Anschlussbereich 41 der Koppelelemente 20 eine Ausnehmung 42. Diese unterstützt die Flexibilität des Ringsegments 6 bzw. 13 im Anschlussbereich 41 und trägt zur Material- und Gewichtseinsparung bei.A recess 42 can also be seen in the connection area 41 of the coupling elements 20. This supports the flexibility of the ring segment 6 or 13 in the connection area 41 and contributes to saving material and weight.
Des Weiteren ist zu erkennen, dass die Koppelelemente 21 über einen parallel zur Stentlängsachse L verlaufenden Longitudinalabschnitt 43 im Tiefsten am Bogenabschnitt 17 zwischen zwei Streben 18, 19 angeschlossen sind.Furthermore, it can be seen that the coupling elements 21 are connected at the deepest to the arch section 17 between two struts 18, 19 via a longitudinal section 43 running parallel to the longitudinal axis L of the stent.
Die Koppelelemente 27, 28, wie anhand der Figuren 4 und 5 beschrieben, sind ebenfalls als zueinander komplementäre Klauenverbinder 33, 34 ausgestaltet, wobei der in Bildebene linke Klauenverbinder 33 gabelförmig konfiguriert ist. In die Gabel 44 greift der rechte Klauenverbinder 34 mit seinem rund konfigurierten Widerlagerkopf 45 ein. Die an den Klauenverbindern 33, 34 ausgebildeten Hinterschneidungsflächen 46, 47 verlaufen gleichförmig gekrümmt.The coupling elements 27, 28, as described with reference to FIGS. 4 and 5, are also designed as mutually complementary claw connectors 33, 34, the claw connector 33 on the left in the image plane being configured in a fork shape. The right claw connector 34 engages in the fork 44 with its round configured abutment head 45. The undercut surfaces 46, 47 formed on the claw connectors 33, 34 are uniformly curved.
Im Widerlagerkopf 45 ist eine kreisrunde Ausnehmung 48 vorgesehen. Die Ausnehmung 48 trägt zur Gewichtseinsparung bei, kann aber auch zur Aufnahme eines Markers genutzt werden, welcher zur Verbesserung der Indentifikation des Stents beim Implantationsvorgang oder danach dient. Anhand der Figuren 6 und 7 ist eine weitere alternative Ausgestaltung von Koppelelementen 29, 30 dargestellt, über die eine lösbare formschlüssige Verbindung zwischen zwei benachbarten Ringsegmenten 6 und 7 bzw. 12 und 13 eines Stents 1 hergestellt werden kann.A circular recess 48 is provided in the abutment head 45. The recess 48 contributes to saving weight, but can also be used to hold a marker which serves to improve the identification of the stent during the implantation process or afterwards. A further alternative embodiment of coupling elements 29, 30 is shown on the basis of FIGS. 6 and 7, via which a releasable form-fitting connection between two adjacent ring segments 6 and 7 or 12 and 13 of a stent 1 can be established.
Auch die Koppelelemente 29, 30 weisen zwei zueinander komplementäre Klauenverbinder 35, 36 auf mit einer trapezförmigen Konfiguration. Der Klauenverbinder 35 besitzt zwei Fingerzinken 49, 50 mit geradlinig verlaufenden Hinterschneidungsflächen 51 , 52, die eine maulartige Aussparung 53 für einen trapezförmig gestalteten Zinken 54 des Klauenverbinders 36 bilden. Der Zinken 54 kommt in der Aussparung 53 zum Eingriff und stützt sich hier mit seinen geradlinigen Hinterschneidungsflächen 55, 56 ab. Der Zinken 54 weist ferner einen verbreiterten Basisabschnitt 57 auf, der in einen Longitudinalabschnitt 58 übergeht zum Anschluss an einen Bogenabschnitt 17 zwischen zwei Streben 18, 19. The coupling elements 29, 30 also have two mutually complementary claw connectors 35, 36 with a trapezoidal configuration. The claw connector 35 has two finger tines 49, 50 with rectilinear undercut surfaces 51, 52 which form a jaw-like recess 53 for a trapezoidal tine 54 of the claw connector 36. The prong 54 engages in the recess 53 and is supported here with its straight undercut surfaces 55, 56. The tine 54 also has a widened base section 57 which merges into a longitudinal section 58 for connection to an arc section 17 between two struts 18, 19.
BezugszeichenaufstellungREFERENCE NUMBERS
1 - Stent1 - stent
2- Stützgerüst2- scaffolding
3 - Ringsegment3 - ring segment
4 - Ringsegment 5- Ringsegment4 - ring segment 5 - ring segment
6 - Ringsegment6 - ring segment
7 - Ringsegment7 - ring segment
8 - Ringsegment8 - ring segment
9 - Ringsegment 10- Ringsegment 11 - Ringsegment9 - ring segment 10 - ring segment 11 - ring segment
12- Ringsegment12-ring segment
13- Ringsegment13- ring segment
14- Ringsegment14-ring segment
15- Ringsegment15-ring segment
16- Ringsegment16-ring segment
17- Bogenabschnitt17- arch section
18- Strebe18- strut
19- Strebe19- strut
20 - Koppelelement20 - coupling element
21 - Koppelelement21 - coupling element
22 - Verbinderstrebe22 - connector strut
23- Stentabschnitt23 stent section
24- Stentabschnitt24 stent section
25- Stentabschnitt25 stent section
26 - Strebenabschnitt26 - strut section
27 - Koppelelement27 - coupling element
28 - Koppelelement28 - coupling element
29 - Koppelelement 0 - Koppelelement 1 - Klauenverbinder 2 - Klauenverbinder 3 - Klauenverbinder 4 - Klauenverbinder 5 - Klauenverbinder 6 - Klauenverbinder 7 - gerade Hinterschneidungsfläche 8 - gekrümmte Hinterschneidungsfläche 9 - Hakenabschnitt 0 - Widerlagerabschnitt 1 - Anschlussbereich 2 - Ausnehmung 3 - Longitudinalabschnitt 4 - Gabel 5 - Widerlagerkopf 6 - Hinterschneidungsfläche 7 - Hinterschneidungsfläche 8 - Ausnehmung 9 - Fingerzinken 0 - Fingerzinken 1 - Hinterschneidungsfläche 2 - Hinterschneidungsfläche 3 - Aussparung 4 - Zinken 5 - Hinterschneidungsfläche 6 - Hinterschneidungsfläche 7 - Basisabschnitt 8 - Longitudinalabschnitt29 - coupling element 0 - Coupling element 1 - claw connector 2 - claw connector 3 - claw connector 4 - claw connector 5 - claw connector 6 - claw connector 7 - straight undercut surface 8 - curved undercut surface 9 - hook section 0 - abutment section 1 - connection area 2 - recess 3 - longitudinal section 4 - fork 5 - abutment head 6 - undercut surface 7 - undercut surface 8 - recess 9 - finger tines 0 - finger tines 1 - undercut surface 2 - undercut surface 3 - recess 4 - tines 5 - undercut surface 6 - undercut surface 7 - base section 8 - longitudinal section
L - Stentlängsachse L - longitudinal stent axis

Claims

Patentansprüche claims
1. Stent mit einem tubulären Stützgerüst (2) aus axial aufeinander folgenden untereinander verbundenen Ringsegmenten (3-16), dadurch gekennzeichnet, dass zumindest zwei benachbarte Ringsegmente (6 und 7 bzw. 12 und 13) durch formschlüssig ineinandergreifende Koppelelemente (20, 21; 27, 28; 29, 30) verbunden sind.1. Stent with a tubular support structure (2) made of axially successive interconnected ring segments (3-16), characterized in that at least two adjacent ring segments (6 and 7 or 12 and 13) by form-fitting interlocking coupling elements (20, 21; 27, 28; 29, 30) are connected.
2. Stent nach Anspruch 1, dadurch gekennzeichnet, dass die Koppelelemente (20, 21; 27, 28; 29, 30) als zueinander komplementäre Klauenverbinder (31, 32; 33, 34; 35, 36) ausgebildete sind.2. Stent according to claim 1, characterized in that the coupling elements (20, 21; 27, 28; 29, 30) are designed as mutually complementary claw connectors (31, 32; 33, 34; 35, 36).
3. Stent nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Koppelelemente (20, 21; 27, 28; 29, 30) gegenüber den Ringsegmenten (6, 7; 12, 13) in Stentlängsachse (L) axial vorstehen.3. Stent according to claim 1 or 2, characterized in that the coupling elements (20, 21; 27, 28; 29, 30) protrude axially in relation to the ring segments (6, 7; 12, 13) in the longitudinal axis of the stent (L).
4. Stent nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Koppelelemente (20, 21; 27, 28) gekrümmt verlaufende Hinterschneidungsflächen (38, 46, 47) aufweisen.4. Stent according to one of claims 1 to 3, characterized in that the coupling elements (20, 21; 27, 28) have curved undercut surfaces (38, 46, 47).
5. Stent nach einem der Ansprüche 1 bis 3, dadurch gekennzeichne t, dass die Koppelelemente (20, 21 ; 29, 30) geradlinig verlaufende Hinterschneidungsflächen (37, 51, 52, 55, 56) aufweisen.5. Stent according to one of claims 1 to 3, characterized in that the coupling elements (20, 21; 29, 30) have rectilinear undercut surfaces (37, 51, 52, 55, 56).
6. Stent nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass Ringsegmente (3-6; 7-12; 13-16) durch Verbinderstreben (22) zu Stentabschnitten (23, 24, 25) zusammengeschlossen sind.6. Stent according to one of claims 1 to 5, characterized in that ring segments (3-6; 7-12; 13-16) are joined together by connecting struts (22) to form stent sections (23, 24, 25).
7. Stent nach einem der Ansprüche 1 bis 6, dadurch gekennzeichne t, dass die Ringsegmente (3-16) aus sich wellenförmig endlos aneinanderschließenden Streben (18, 19) gebildet sind. 7. Stent according to one of claims 1 to 6, characterized in that the ring segments (3-16) are formed from struts (18, 19) which are endlessly adjoining in a wave-like manner.
PCT/DE2004/000570 2003-06-04 2004-03-19 Stent WO2004110312A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10325128A DE10325128A1 (en) 2003-06-04 2003-06-04 stent
DE10325128.6 2003-06-04

Publications (1)

Publication Number Publication Date
WO2004110312A1 true WO2004110312A1 (en) 2004-12-23

Family

ID=33494807

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2004/000570 WO2004110312A1 (en) 2003-06-04 2004-03-19 Stent

Country Status (2)

Country Link
DE (1) DE10325128A1 (en)
WO (1) WO2004110312A1 (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1523959A2 (en) * 2003-10-17 2005-04-20 Cordis Corporation Stent design having independent segments which uncouple upon deployment
US7704275B2 (en) 2007-01-26 2010-04-27 Reva Medical, Inc. Circumferentially nested expandable device
US7722662B2 (en) 1998-02-17 2010-05-25 Reva Medical, Inc. Expandable stent with sliding and locking radial elements
US7763065B2 (en) 2004-07-21 2010-07-27 Reva Medical, Inc. Balloon expandable crush-recoverable stent device
WO2010118126A1 (en) 2009-04-07 2010-10-14 William Cook Europe Aps Modular stent assembly
US7914574B2 (en) 2005-08-02 2011-03-29 Reva Medical, Inc. Axially nested slide and lock expandable device
US7947071B2 (en) 2008-10-10 2011-05-24 Reva Medical, Inc. Expandable slide and lock stent
US7988721B2 (en) 2007-11-30 2011-08-02 Reva Medical, Inc. Axially-radially nested expandable device
US8277500B2 (en) 2004-12-17 2012-10-02 Reva Medical, Inc. Slide-and-lock stent
US8523936B2 (en) 2010-04-10 2013-09-03 Reva Medical, Inc. Expandable slide and lock stent
CN104068951A (en) * 2007-05-23 2014-10-01 山东吉威医疗制品有限公司 Devices for controlling expandable prostheses during deployment
US9149378B2 (en) 2005-08-02 2015-10-06 Reva Medical, Inc. Axially nested slide and lock expandable device
US9408732B2 (en) 2013-03-14 2016-08-09 Reva Medical, Inc. Reduced-profile slide and lock stent
US9566179B2 (en) 2003-12-23 2017-02-14 J.W. Medical Systems Ltd. Devices and methods for controlling and indicating the length of an interventional element

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007019703A1 (en) 2007-04-26 2008-10-30 Biotronik Vi Patent Ag stent
DE102007022060A1 (en) * 2007-05-11 2008-11-13 Rubenstein, Nicola M., Dr. Device for connecting two blood vessels
DE102010025305B4 (en) 2010-06-28 2019-10-02 Admedes Schuessler Gmbh Implant for implanting in the human body and method of making the same
FR3009185A1 (en) * 2013-08-01 2015-02-06 Cousin Biotech ANASTOMOTIC DEVICE FOR JOINING LUMENS OR VISCERES BETWEEN THEM

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0364787B1 (en) 1988-10-04 1992-03-04 EXPANDABLE GRAFTS PARTNERSHIP a Texas General Partnership Expandable intraluminal graft
WO2000015151A1 (en) * 1998-09-16 2000-03-23 Isostent, Inc. Linkage stent
DE19950756A1 (en) 1999-02-28 2000-08-31 Inflow Dynamics Inc Stent has ring elements containing couplings with extensions
DE10026307A1 (en) 2000-05-26 2001-11-29 Variomed Ag Balzers Stent, positioning element and insertion catheter
US20020111671A1 (en) * 2001-02-15 2002-08-15 Stenzel Eric B. Locking stent
WO2003075797A2 (en) * 2002-03-14 2003-09-18 Angiomed Gmbh & Co. Medizintechnik Kg Mri compatible stent and method of manufacturing the same_______

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7070614B1 (en) * 2000-05-22 2006-07-04 Malte Neuss Radially expandable vessel support

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0364787B1 (en) 1988-10-04 1992-03-04 EXPANDABLE GRAFTS PARTNERSHIP a Texas General Partnership Expandable intraluminal graft
WO2000015151A1 (en) * 1998-09-16 2000-03-23 Isostent, Inc. Linkage stent
DE19950756A1 (en) 1999-02-28 2000-08-31 Inflow Dynamics Inc Stent has ring elements containing couplings with extensions
DE10026307A1 (en) 2000-05-26 2001-11-29 Variomed Ag Balzers Stent, positioning element and insertion catheter
US20020111671A1 (en) * 2001-02-15 2002-08-15 Stenzel Eric B. Locking stent
WO2003075797A2 (en) * 2002-03-14 2003-09-18 Angiomed Gmbh & Co. Medizintechnik Kg Mri compatible stent and method of manufacturing the same_______

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7722662B2 (en) 1998-02-17 2010-05-25 Reva Medical, Inc. Expandable stent with sliding and locking radial elements
EP1523959A3 (en) * 2003-10-17 2006-07-05 Cordis Corporation Stent design having independent segments which uncouple upon deployment
EP1523959A2 (en) * 2003-10-17 2005-04-20 Cordis Corporation Stent design having independent segments which uncouple upon deployment
US9566179B2 (en) 2003-12-23 2017-02-14 J.W. Medical Systems Ltd. Devices and methods for controlling and indicating the length of an interventional element
US9700448B2 (en) 2004-06-28 2017-07-11 J.W. Medical Systems Ltd. Devices and methods for controlling expandable prostheses during deployment
US8512394B2 (en) 2004-07-21 2013-08-20 Reva Medical Inc. Balloon expandable crush-recoverable stent device
US7763065B2 (en) 2004-07-21 2010-07-27 Reva Medical, Inc. Balloon expandable crush-recoverable stent device
US8277500B2 (en) 2004-12-17 2012-10-02 Reva Medical, Inc. Slide-and-lock stent
US9173751B2 (en) 2004-12-17 2015-11-03 Reva Medical, Inc. Slide-and-lock stent
US8292944B2 (en) 2004-12-17 2012-10-23 Reva Medical, Inc. Slide-and-lock stent
US9149378B2 (en) 2005-08-02 2015-10-06 Reva Medical, Inc. Axially nested slide and lock expandable device
US7914574B2 (en) 2005-08-02 2011-03-29 Reva Medical, Inc. Axially nested slide and lock expandable device
US8617235B2 (en) 2005-08-02 2013-12-31 Reva Medical, Inc. Axially nested slide and lock expandable device
US8540762B2 (en) 2007-01-26 2013-09-24 Reva Medical, Inc. Circumferentially nested expandable device
US7704275B2 (en) 2007-01-26 2010-04-27 Reva Medical, Inc. Circumferentially nested expandable device
CN104068951A (en) * 2007-05-23 2014-10-01 山东吉威医疗制品有限公司 Devices for controlling expandable prostheses during deployment
US8460363B2 (en) 2007-11-30 2013-06-11 Reva Medical, Inc. Axially-radially nested expandable device
US7988721B2 (en) 2007-11-30 2011-08-02 Reva Medical, Inc. Axially-radially nested expandable device
US9314354B2 (en) 2007-11-30 2016-04-19 Reva Medical, Inc. Axially-radially nested expandable device
US8545547B2 (en) 2008-10-10 2013-10-01 Reva Medical Inc. Expandable slide and lock stent
US9066827B2 (en) 2008-10-10 2015-06-30 Reva Medical, Inc. Expandable slide and lock stent
US7947071B2 (en) 2008-10-10 2011-05-24 Reva Medical, Inc. Expandable slide and lock stent
US8361141B2 (en) 2009-04-07 2013-01-29 Cook Medical Technologies Llc Modular stent assembly
WO2010118126A1 (en) 2009-04-07 2010-10-14 William Cook Europe Aps Modular stent assembly
US8523936B2 (en) 2010-04-10 2013-09-03 Reva Medical, Inc. Expandable slide and lock stent
US9452068B2 (en) 2010-04-10 2016-09-27 Reva Medical, Inc. Expandable slide and lock stent
US9408732B2 (en) 2013-03-14 2016-08-09 Reva Medical, Inc. Reduced-profile slide and lock stent

Also Published As

Publication number Publication date
DE10325128A1 (en) 2005-01-05

Similar Documents

Publication Publication Date Title
WO2004110312A1 (en) Stent
DE69838428T2 (en) IMPROVED STYLE CONFIGURATIONS
DE69920127T2 (en) TUBULAR DRAHTHYBRIDSTENT
EP0536610B1 (en) Stenosis dilatation device
DE102005016103B4 (en) Duodenumstent
DE60021040T2 (en) Flexible medical stent
DE69732992T2 (en) Stent with variable properties for support optimization
DE4407079B4 (en) Intraluminal jig and graft
DE69629871T2 (en) Prosthetic implant
DE60111161T2 (en) Stent with a small cross-section
EP1011534B1 (en) Stent for transluminal implantation
DE102004012981B4 (en) stent
EP0481365A1 (en) Device for expanding a stenosis in a body duct
DE10253634A1 (en) endoprosthesis
DE102006057216A1 (en) Device for treating a blood vessel
DE10109508A1 (en) Longitudinally flexible stent
DE102004003093B4 (en) Stent for insertion and expansion in a lumen
WO2006029617A1 (en) Supporting prosthesis
WO2008113193A1 (en) Stent with vessel valve
DE10050970A1 (en) Coronary stent has tubular body with support sections, arm elements connected by connecting elements.
DE102012107175A1 (en) Medical closure device for supplying into cylindric blood vessel of body for closing aneurysms, has wall comprising wall segments, where wall segments of pair exhibit larger bending flexibility than wall segments of other pair
DE10243136A1 (en) Stent for implantation in or around a hollow organ
DE10333511A1 (en) Stent and stent delivery system, comprising balloon enveloped by two rings made of specifically bent wires
EP1684665B1 (en) Stent
DE20318351U1 (en) Medical stent has twin sets of loops in two rows alternating one with the other for insertion to blood vessel

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase