Ratcheting stent

• US 5,618,299 A
• Filed: 08/08/1995
• Issued: 04/08/1997
• Est. Priority Date: 04/23/1993
• Status: Expired due to Fees

• Current Assignee: Advanced Cardiovascular Systems Incorporated (Abbott Laboratories)
• Original Assignee: Advanced Cardiovascular Systems Incorporated (Abbott Laboratories)
• Inventors: Khosravi, Farhad, Williams, Michael S.
• Primary Examiner(s): DAWSON, GLENN K
• Application Number:
  US08/512,300
• Time in Patent Office: 609 Days
• Field of Search: 606/1, 606/108, 606/190-198, 623/1, 623/11, 623/12
• US Class Current: 623/1.2
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/93 circumferentially expandable by using ratcheting locks
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2210/0004 bioabsorbable
• CPC Class Codes: A61F 2250/0067 Means for introducing or releasing pharmaceutical products into the body

Abstract

An intravascular stent including a cylindrical sheet having overlapping edges that interlock. The edges have a series of protrusions and apertures that interlock and ratchet as the stent expands to an open position to support a section of arterial wall. The stent may be expanded by a balloon catheter or it may be self-expanding. The stent is biocompatible, may be bio-erodible, and capable of localized drug delivery. A plurality of retaining members to keep the stent open are disclosed. In one embodiment a buckle fastening member is used, while in another embodiment a helical seam containing projections is employed. The stent may be wound in such a manner that during expansion of the stent one side of the sheet desires to return to its original shape, creating a bias. In addition, a variety of reticulated structure stents are disclosed, with novel geometric patterns that aid in increased flexibility while preserving radial strength and also allow blood-tissue interaction and side branch access. The intravascular stent may be made of a sheet of material strengthened and stiffened by pyrolytic carbon or by structural reinforcement as in composite laminates.

Claims

1. An intraluminal stent implantable in a body lumen, comprising:

a substantially cylindrical body portion having a length extending along a longitudinal direction, the body portion having a first edge containing a slot extending along the longitudinal direction, and the body portion having a second edge extending along the longitudinal direction;

the second edge passing through the slot;

a third edge and a fourth edge each having a plurality of teeth for engaging the slot in interlocking relationship;

wherein when the cylindrical body portion is expanded from a first reduced diameter to a second, enlarged diameter, the plurality of teeth engage the slot in an interlocking relationship to thereby hold the stent in the second, enlarged diameter configuration.