Stent, stent delivery device and stent delivery method

• US 9,526,643 B2
• Filed: 09/13/2013
• Issued: 12/27/2016
• Est. Priority Date: 09/29/2006
• Status: Active Grant

• Current Assignee: Terumo Kabushiki Kaisha
• Original Assignee: Terumo Kabushiki Kaisha
• Inventors: Goto, Hiroki
• Primary Examiner(s): SZPIRA, JULIE ANN
• Application Number:
  US14/026,257
• Publication Number:
  US 20140018905A1
• Time in Patent Office: 1,201 Days
• US Class Current: 1/1
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• 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 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/91558 connected peak to peak

Abstract

A stent to be implanted in a living body is formed substantially as a tube having a form in which plural wavy annular members are arranged adjacent to each other in the axial direction of the stent, with the axially adjacent wavy annular members connected to each other. The stent possesses an outer diameter whose dimension is so set that the stent is insertable into a lumen inside a living body, and is expandable when a force spreading radially from the inside of the tube is applied. The wavy annular member has parallel straight-line portions extending parallel to the axis of the stent before and after the stent expands. The stent has connection portions each connecting ends of the parallel straight-line portions of the adjacent wavy annular members to each other.

Claims

1. A stent possessing an axis, formed substantially as a tube and comprising a plurality of wavy annular members arranged along an axial extent of the stent so that the plurality of wavy annular members are axially adjacent wavy annular members, with axially adjacent wavy annular members connected to each other, the axially adjacent annular members being configured so that the stent in a first state possesses a relatively smaller outer diameter dimensioned to be inserted into a lumen inside a living body, and is expandable from the first state to a second expanded state possessing a relatively larger outer diameter when a force spreading radially outwardly from inside the tube is applied to the stent, each of the plurality of wavy annular members comprising a plurality of modified M-shaped linear portions which are continuous with each other, each of the modified M-shaped linear portions including four linear portions, the four linear portions comprising:

i) a straight-line portion extending parallel to the axis of the stent when the stent is in the first state;

ii) a first inclined straight-line portion connected to one end of the straight-line portion through a bent portion and oriented obliquely to the axis of the stent at least when the stent is in the expanded second state;

iii) an inclined curved line portion connected to one end of the first inclined straight-line portion through a bent portion and extending obliquely to the axis of the stent; and

iv) a second inclined straight-line portion connected to one end of the inclined curved linear portion through a bent portion and oriented obliquely to the axis of the stent at least when the stent is in the expanded second state.

2. A stent according to claim 1, wherein the inclined curved line portion of each of the modified M-shaped linear portions includes two curved portions which curve in opposite directions.

3. A stent according to claim 1, wherein the first inclined straight-line portion and the second inclined straight-line portion extend parallel to the axis of the stent when the stent is in the first state before the stent is expanded to the expanded second state.

4. A stent according to claim 1, wherein the inclined curved line portion extends obliquely to the axis of the stent when the stent is in the first state before the stent is expanded to the expanded second state, and wherein the inclined curved line portion extends obliquely to the axis of the stent after the stent is expanded to the expanded second state.

5. A stent according to claim 1, further comprising connection portions each connecting together opposed ends of the straight-line portions of the axially adjacent wavy annular members.