Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Arterial prosthesis – Stent structure
Reexamination Certificate
1999-10-29
2001-12-04
Truong, Kevin (Department: 3731)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Arterial prosthesis
Stent structure
Reexamination Certificate
active
06325823
ABSTRACT:
FIELD OF THE INVENTION
The field of the invention relates to prostheses for repairing occlusive and aneurysmal vascular disease, and more particularly, an endovascular prosthesis capable of accommodating torsional and longitudinal displacements between its ends.
BACKGROUND OF THE INVENTION
The recent introduction of endoluminal graft prostheses, such as stents and stent-graft systems, for the treatment of arterial and venous defects, such as aneurysms, hold the promise of reduced procedural morbidity and mortality compared to previously known surgical alternatives.
For example, U.S. Pat. No. 5,078,726 to Kreamer describes a stent graft system wherein a graft is affixed to intact portions of a vessel above and below an aneurysm using coiled sheet stents. Likewise, U.S. Pat. No. 5,219,355 to Parodi et al. shows a graft affixed to intact portions of a vessel wall above and below an aneurysm using balloon-expandable stents. U.S. Pat. No. 5,275,622 to Lazarus also shows a graft affixed at its upper and lower ends using self-expanding sinusoidal rings.
One drawback encountered with systems such as those described in the foregoing patents is that relative movement of the upper and lower fixation devices after initial deployment of the stents may result in twisting of the graft material. Such torsional displacements between the ends of the graft may cause a reduction in the flow area of the graft and/or the creation of stagnation zones that promote clotting within the lumen of the graft.
In addition, excluding an aneurysm from the flow path and subsequent clotting of the blood contained within the aneurysmal cavity may result in foreshortening of the vessel, thereby causing longitudinal movement of the graft fixation devices towards one another. Such longitudinal displacements may in turn cause buckling: the graft may bow outward, sag, kink, or crumple, again promoting stagnation zones and thrombus formation within the lumen of the graft.
Moreover, because the structure of the human vascular tree varies from patient to patient, each procedure is a unique experience. For example, an aneurysm existing in a straight vessel segment may be excluded with a tubular graft, whereas an aneurysm occurring at, abutting or including a vessel bifurcation may require the use of a custom prosthesis.
Repair of an aneurysm located adjacent to a bifurcated vessel presents further technical difficulties, including the inability to easily enter both vessel branches because of vessel size, vessel tortuosity, device size, or limited device flexibility. There may also be an inability to adequately expand the device and create fluid seals at the ends of the aneurysm. If a custom device does not fit, surgical intervention also may be necessary to remove the device, thereby exposing the patient to additional risk. These problems are compounded where the diseased area of a vessel may change in length, size, and shape after the prosthesis has been deployed.
In view of the foregoing, it would be desirable to provide a vascular prosthesis that may be readily adapted to vessels of various sizes, including bifurcated vessels.
It further would be desirable to provide a vascular prosthesis that can accommodate changes in the size and shape of the vessel after the prosthesis has been deployed.
It also would be desirable to provide a vascular prosthesis that can accommodate torsional and longitudinal displacements between the fixation devices that affix the vascular prosthesis to intact portions of the vessel wall, without twisting or kinking of the prosthesis.
SUMMARY OF THE INVENTION
In view of the foregoing, it is an object of the present invention to provide a vascular prosthesis that may be readily adapted to vessels of various sizes, including bifurcated vessels.
It is another object of this invention to provide a vascular prosthesis that can accommodate changes in the size and shape of the vessel after the prosthesis has been deployed.
It is a further object of the present invention to provide a vascular prosthesis that can accommodate torsional and longitudinal displacements between the fixation devices that affix the vascular prosthesis to intact portions of the vessel wall, without twisting or kinking of the prosthesis.
These and other objects of the invention are accomplished by providing a vascular prosthesis having first and second interconnecting members. One end of each of the first and second members is fixed to an intact portion of vessel wall on either side of a vascular defect to be excluded. In accordance with the principles of the present invention, the other ends of the first and second members are interconnected so that one end telescopes and rotates within the other end. The first and second members of the graft of the present invention therefore define a custom, self-adjusting member, assembled in vivo, that spans a diseased section of a vascular system.
The prosthesis of the present invention also facilitates repair of complex vascular structures, such as bifurcated vessels. Changes in the size and shape of the damaged section may be readily accommodated without buckling or twisting of the graft. In addition, the prosthesis may comprise a semipermeable material that relieves pressure build up in the aneurysm cavity, and promotes clot formation in the aneurysm cavity.
REFERENCES:
patent: 4655771 (1987-04-01), Wallsten
patent: 4850999 (1989-07-01), Planck
patent: 5078726 (1992-01-01), Kreamer
patent: 5084065 (1992-01-01), Weldon et al.
patent: 5163951 (1992-11-01), Pinchuk et al.
patent: 5211658 (1993-05-01), Clouse
patent: 5219355 (1993-06-01), Parodi et al.
patent: 5275622 (1994-01-01), Lazarus
patent: 5314444 (1994-05-01), Gianturco
patent: 5354329 (1994-10-01), Whalen
patent: 5383892 (1995-01-01), Cardon et al.
patent: 5413597 (1995-05-01), Krajicek
patent: 5413598 (1995-05-01), Moreland
patent: 5562727 (1996-10-01), Turk et al.
patent: 5628788 (1997-05-01), Pinchuk
patent: 5629077 (1997-05-01), Turnlund et al.
patent: 5632772 (1997-05-01), Alcime et al.
patent: 5639278 (1997-06-01), Dereume et al.
patent: 5651174 (1997-07-01), Schwartz et al.
patent: 5653746 (1997-08-01), Schmitt
patent: 5669924 (1997-09-01), Shaknovich
patent: 5674277 (1997-10-01), Freitag
patent: 5674576 (1997-10-01), Anderson et al.
patent: 5683449 (1997-11-01), Marcade
patent: 5697970 (1997-12-01), Schmitt et al.
patent: 5720735 (1998-02-01), Dorros
patent: 5755772 (1998-05-01), Evans et al.
patent: 5755773 (1998-05-01), Evans et al.
patent: 5755777 (1998-05-01), Chuter
patent: 5758562 (1998-06-01), Thompson
patent: 5759174 (1998-06-01), Fischell et al.
patent: 5788626 (1998-08-01), Thompson
patent: 5800507 (1998-09-01), Schwartz
patent: 5824040 (1998-10-01), Cox et al.
patent: 5824052 (1998-10-01), Khosravi et al.
patent: 5868783 (1999-02-01), Tower
patent: 5902332 (1999-05-01), Schatz
patent: 5921995 (1999-07-01), Kleshinski
patent: 5961548 (1999-10-01), Shmulewitz
patent: 6001125 (1999-12-01), Golds et al.
Carlos E. Ruiz et al., “A Novel Method for Treatment of Abdominal Aortic Aneurysms Using Percutaneous Implantation of a Newly Designed Endovascular Device”,Circulation, 91:2470-2477, 1995.
Carlos E. Ruiz et al., “Percutaneous Treatment of Abdominal Aortic Aneurysm in a Swine Model”,Circulation, 96:2438-2448, 1997.
Dorros Gerald
Horzewski Michael J.
Fish & Neave
Pisano Nicola A.
Revasc Corporation
Truong Kevin
LandOfFree
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