Ratcheting stent

Details Ratcheting stent Ratcheting stent

A - Human Necessities

61

F

A61F 2/04 (2006.01) A61F 2/06 (2006.01) A61F 2/00 (2006.01) A61F 2/02 (2006.01)

Patent

CA 2121985

ABSTRACT An intravascular stent comprising 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 comprising the stent 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 which 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.

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