Valved stent, base material for forming valved stent, and method for producing valved stent

• US 9,956,074 B2
• Filed: 01/07/2015
• Issued: 05/01/2018
• Est. Priority Date: 09/09/2011
• Status: Expired due to Fees

• Current Assignee: National Cerebral And Cardiovascular Center, Shinkan Kogyo K.K.
• Original Assignee: National Cerebral And Cardiovascular Center, Shinkan Kogyo K.K.
• Inventors: Nakayama, Yasuhide, Oie, Tomonori
• Primary Examiner(s): Matthews, Howie
• Application Number:
  US14/591,379
• Publication Number:
  US 20150119970A1
• Time in Patent Office: 1,210 Days
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/2412 with soft flexible valve members, e.g. tissue valves shaped like natural valves check valves with flexible valve members in general F16K15/14
• CPC Class Codes: A61F 2/2415 Manufacturing methods
• CPC Class Codes: A61F 2/2418 Scaffolds therefor, e.g. support stents
• CPC Class Codes: A61F 2/2475 Venous valves
• CPC Class Codes: A61F 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• CPC Class Codes: A61F 2002/061 provided with means for allowing access to secondary lumens
• CPC Class Codes: A61F 2002/072 Encapsulated stents, e.g. wire or whole stent embedded in lining
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2240/001 Designing or manufacturing processes
• CPC Class Codes: A61F 2240/004 Using a positive or negative model, e.g. moulds
• CPC Class Codes: B32B 1/00 Layered products having a non-planar shape
• CPC Class Codes: Y10T 428/2933 Coated or with bond, impregnation or core

Abstract

The present invention provides a valved stent that can provide a valve function without blocking a branch blood vessel, and also can provide a valve function with minimum covering of blood vessel tissue in a stent indwelling section. Specifically, a cylindrical stent body 4 is provided. A leaflet 5 that can open/close a blood vessel 2 in a blood flow direction is provided. The leaflet 5 is composed of connective tissue and protrudes radially inward from the stent body 4. An inside and an outside of the stent body 4 radially communicate with each other. The stent does not block a branch blood vessel 8. An area of the blood vessel covered with the stent is reduced.

Claims

1. A base material for forming a valved stent that is capable of receiving a stent body, and that is capable of being placed in an environment with a body tissue material to form tissue on a surface of the base material and form the valved stent including a leaflet protruding radially inward, the base material comprising:

a columnar base material body;

a plurality of recesses formed in an outer peripheral surface of the columnar base material body;

an inner cover that covers the plurality of recesses to form a leaflet forming space for forming the leaflet; and

an outer cover on an outer surface side of the inner cover, the outer cover and the inner cover being capable of receiving the stent body therebetween to prevent tissue from entering between the outer cover and the inner cover.

2. The base material according to claim 1, further comprising:

a first positioning section that circumferentially positions the columnar base material body and the inner cover; and

a second positioning section that circumferentially positions the inner cover and the outer cover.

3. The base material according to claim 1, wherein the tissue to be formed on the surface of the base material is a film.