Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Arterial prosthesis – Stent in combination with graft
Reexamination Certificate
2000-03-03
2001-11-20
Truong, Kevin (Department: 3731)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Arterial prosthesis
Stent in combination with graft
Reexamination Certificate
active
06319278
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a low profile device for treatment of vascular abnormalities, such as the repair of aneurysms.
In the past, treatment of aneurysms involved an open surgical procedure which exposed the affected lumen and bypassing the aneurysm with an artificial tubular graft.
More recently stent grafts have been employed as a minimally invasive alternative to traditional graft bypass surgery. There are a number of stent graft designs that have been tried. Current designs are limited to use with patients having large vessels because of the large size of the delivery systems. Such large sizes require surgical exposure of the vascular system and in smaller patients, often females, such stent grafts are simply too large to use at all. In addition, such larger stent graft designs can be difficult to position and may cause damage to the blood vessels.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a stent graft design that has a low cross sectional profile that can be delivered percutaneously and used in patients with small and tortuous vessels.
It is a further object to provide a stent graft that is highly flexible.
It is a still further object to provide a stent graft that is simple and inexpensive to construct.
These and other objects are achieved by providing a stent graft that has a minimal metallic endoskeleton that holds the graft material in place until secondary deployment of additional stents. Such a minimal metallic endoskeleton allows the delivery system to have a lower cross-sectional profile than conventional stent grafts.
The endoskeleton of the stent graft of this invention has a first self expandable metallic stent located at the distal end thereof and a second self expandable metallic stent located at the proximal end thereof. At least one flexible longitudinal strut member extends between and is connected to the first and second stents. The strut member can have a fixed length or can be a compound strut comprised of two or more strut sections that are fastened together in a manner that allows a sliding motion between the strut sections so that the compound strut can be elongated by applying traction to the proximal stent.
The endoskeleton of the stent graft of this invention may be bifurcated for use with aneurysms of the abdominal aorta.
The endoskeleton of the stent graft of this invention is inserted into a tube of a graft material and the tube attached to the first and second stents. In the case of the bifurcated system, the graft material is also connected to the third contralateral stent.
REFERENCES:
patent: 5282824 (1994-02-01), Gianturco
patent: 5443496 (1995-08-01), Schwartz et al.
patent: 5562697 (1996-10-01), Christiansen
patent: 5591195 (1997-01-01), Taheri et al.
patent: 5693084 (1997-12-01), Chuter
patent: 5851228 (1998-12-01), Pinheiro
Howard Robert E.
Truong Kevin
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