Stent comprising terminal anchoring elements

• US 9,101,502 B2
• Filed: 09/16/2004
• Issued: 08/11/2015
• Est. Priority Date: 09/16/2003
• Status: Expired due to Fees

• Current Assignee: Pfm Medical AG
• Original Assignee: Pfm Medical AG
• Inventors: Jung, Johannes
• Primary Examiner(s): Isabella, David
• Assistant Examiner(s): Ganesan, Suba
• Application Number:
  US10/571,874
• Publication Number:
  US 20070067016A1
• Time in Patent Office: 3,981 Days
• Field of Search: 623/1.15, 623/1.16, 623/1.31, 623/1.34, 623/1.35, 623/1.3, 623/1.36
• US Class Current: 1/1
• CPC Class Codes: A61F 2/848 having means for fixation to the vessel wall, e.g. barbs
• CPC Class Codes: A61F 2/86 Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/89 the wire-like elements comprising two or more adjacent rings flexibly connected by separate members
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/8486 provided on at least one of the ends
• CPC Class Codes: A61F 2002/91525 within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2210/0019 operated at only one temperature whilst inside or touching the human body, e.g. constrained in a non-operative shape during surgery, another temperature only occurring before the operation
• CPC Class Codes: A61F 2220/0008 Fixation appliances for connecting prostheses to the body
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2230/0078 hyperboloidal
• CPC Class Codes: A61F 2250/0037 differing in height or in length
• CPC Class Codes: A61F 2250/0039 differing in diameter
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers

Abstract

The invention relates to a stent comprising terminal anchoring elements. Said stent (10) is provided with a tubular wall that extends along a longitudinal, flexible tubular axis (26), is formed from a flexible grid structure, and has tube ends (20) lying on opposing axis ends. Said wall consists of annular wall segments (11) that are lined up along the axis and are interconnected by means of connection segments (12). The annular wall segments (11) contain wall elements (14, 15) having an elastic structure. The inventive stent is characterized in that the wall comprises a flexible, arched anchoring element (22) on at least one tube end (20, 20′), said anchoring element being connected to at least two terminal wall elements (14, 15, 14′, 15′) in such a way as to form one component, bridging at least one elastic wall element (14, 15), and there is a larger radial distance between the ogive (24) of the arched anchoring element (22) and the tubular axis (26) than between the terminal wall elements (14, 15) and the tubular axis.

Claims

1. A stent for implantation into a surrounding organ, said stent with a tubular wall formed from a flexible grid structure and progressing around a longitudinal axis, possessing tube ends disposed at opposite axis ends, wherein the wall is comprised of annular wall segments including a terminal annular wall segment, said annular wall segments disposed sequentially along the axis and connected to one another by means of connecting segments, and wherein the annular wall segments comprise wall elements with an elastic structure, characterized in that the wall has, on at least one tube end, a plurality of flexible, anchoring elements said anchoring elements each having two radially curved segments joined at a distal angular pointed tip, and each having a proximal end connected in a single-piece structure directly to an intersection of at least two terminal wall elements and wherein none of the segment ends are directly connected to one another and wherein said anchoring element bridges at least two non-sequential elastic wall elements, said tip, positioned at a larger radial distance from the axis than the terminal wall elements;

said anchoring element imparting a pressing force, with said tip, into said surrounding organ, for an anchoring therein, said tip having a radiopaque region, and

an annular wall segment in a terminal region of said stent adjacent to said tube end being directly connected to at least one said annular wall segment adjacent thereto at respective intersections of the wall elements in a symmetrical connection without said connecting segments thereby minimizing an expansion of said stent in said terminal region in an axial direction.

2. The stent, as recited in claim 1, wherein the radially curved segments of the anchoring element have a larger material thickness than the wall elements.

3. The stent, as recited in claim 1, wherein it has at least three anchoring elements.

4. The stent, as recited in any one of the preceding claims, wherein the wall elements of the wall segments of the opposite tube end feature radiopaque regions.

5. The stent, as recited in claim 1, 2, or 3, wherein the opposite tube end relative to the tubular axis is radially expanded and has a larger diameter than the center of the stent.

6. The stent, as recited in claim 1, 2, or 3, wherein the expansion along the tubular axis begins at least two annular wall segments before the end.

7. The stent, as recited in claim 1, 2, or 3, wherein at the tube end on at least the terminal wall segment and the wall segment axially disposed in front of it, each wall element of the terminal segment is connected with its element, axially disposed in front of it, of the next segment by means of a connecting segment.