Percutaneous endoprosthesis using suprarenal fixation and barbed anchors
View Patent ↗An endoprosthetic device for treating abdominal aortic aneurysms using suprarenal fixation. A stent ring is anchored in an area above the renal arties using self-flaring barbs that project during the nitinol expansion process. Sutures extend from the stent ring to an area below the renal arties to a bifurcated trunk portion comprising a nitinol fabric on a non-kinking frame. The bifurcated trunk is sealed proximal the iliac arteries and includes iliac leg holders having self-flaring retention struts for non-traumatic holding of iliac leg prosthetics. Suprarenal fixation and collapsible cells having retention projections and barbs that only flare during the nitinol expansion process assist in lowering the devices profile and sheathability for percutaneous delivery and may provide for recapturing the anchored device.
1. A first tubular percutaneous intra-luminal device having a luminal surface defining an interior comprising:
a collapsible diamond shaped cell having a pair of opposing side arms that span a distance between a first end and a second end of the cell, said cell having a collapsed state and an expanded state, wherein in said collapsed state said opposing side arms are generally straight and disposed generally parallel to each other and wherein in said expanded state said opposing side arms are bent and extend generally laterally away from one another due to diamond foreshortening, thus forming the diamond shape of the cell; and
a centrally disposed strut extending between the first end and the second end of the cell, the strut being configured to deform out of the plane of the luminal surface of the first percutaneous intra-luminal device in a radially inward direction to form a protrusion when the cell is expanded due to diamond foreshortening, the protrusion configured to be mateable with a second frame based intra-luminal device for non-traumatic holding of the second intra-luminal device a barb member extending from the strut, such that the barb member is housed within the cell in the collapsed state and extends beyond the outer diameter of the first percutaneous intra-luminal device in the expanded state to facilitate anchoring.
2. The first tubular percutaneous intra-luminal device of claim 1 , wherein said strut includes a weak area, said weak area operating to cause said strut to bend at said weak area and defining the apex of a protrusion defined by said strut.
3. The first tubular percutaneous intra-luminal device of claim 2 , wherein said strut includes at least one additional weak area, whereby said strut takes on a “W” shape in said expanded state.
4. The first tubular percutaneous intra-luminal device of claim 1 , wherein said cell comprises nitinol.