Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Arterial prosthesis – Having plural layers
Reexamination Certificate
2000-03-13
2001-09-18
O'Connor, Cary E. (Department: 3732)
Prosthesis (i.e., artificial body members), parts thereof, or ai
Arterial prosthesis
Having plural layers
C623S001440
Reexamination Certificate
active
06290722
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a tacky attachment for adhering a cover to a stent and to a method for adhering a cover to a stent.
Stents are typically implanted within a vessel in a contracted state and expanded when in place in the vessel in order to maintain patency of the vessel to allow fluid flow through the vessel. Implantation of stents is typically accomplished by mounting the stent on a balloon portion of a catheter, positioning the stent in a body lumen and expanding the stent to an expanded state by inflation of a balloon within the stent. The stent is left in place by deflating the balloon and removing the catheter.
Stents typically have a metallic structure to provide strength which is required to function or to support a stent. However, metals do not provide for delivery of localized therapeutic pharmacological treatment of a vessel at the location being treated within the stent.
Polymeric materials capable of absorbing and releasing therapeutic agents typically do not fulfill structural and mechanical requirements of a stent, especially when the polymeric materials are loaded with a drug, since the drug loading of a polymeric material significantly affects the structural and mechanical properties of the polymeric material.
U.S. Pat. No. 5,637,113, which issued Jun. 10, 1997, to Tarataglia et al. describes a metallic stent which is wrapped with a polymer film. The polymer film is capable of carrying and releasing therapeutic agents. The polymeric film is secured to the metallic stent by a mechanism such as an adhesive bonding. The adhesive is a copolymer of poly-L-lactic acid (L-PLA) and polycaprolactone (PCL). Other adhesives, heat bonding, solvent bonding and one or more mechanical fasteners, such as a metal clip are also suitable.
SUMMARY OF THE INVENTION
One embodiment of the present invention includes a stent. The stent comprises a structural support. A polymeric film or sheet or tube overlays the structural support. A tacky portion adheres the polymeric film to the structural support. The tacky portion comprises sugar or starch or polyvinylalcohol or degradation products or mixtures of these materials.
Another embodiment of the present invention includes an adhering system. The adhering system comprises a tacky material or a mixture of tacky materials. The tacky materials include sugar, starch or polyvinylalcohol or degradations products or mixtures of these materials.
One other embodiment of the present invention includes a method for adhering a polymeric sheet or tube to a stent structural member. The method includes providing a stent structural member and providing a polymeric sheet or tube. The method also includes preparing a mixture comprising sugar, polyvinylalcohol, starch or a mixture or degradation products of sugar, polyvinylalcohol or starch and a solvent. The mixture is applied to either the stent structural member or the polymeric sheet or tube.
Another embodiment of the present invention includes a stent assembly. The stent assembly comprises a structural member, a polymeric sleeve and a tacky portion. The tacky portion adheres the sleeve to the structural member. The tacky portion comprises one or more of a sugar, a starch, polyvinylalcohol or a mixture of these materials or degradation products of these materials.
Another stent assembly embodiment of the present invention comprises a structural member, a polymeric sheet and a tacky portion. The tacky portion adheres the polymeric sheet to the structural member and adheres one end of the sheet to the sheet to form a sheet tube. The tacky portion comprises one or more of a sugar, a starch, polyvinylalcohol or a mixture of these materials or degradation products of these materials.
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Endovascular Technologies, Inc.
O'Connor Cary E.
Schwegman Lundberg Woessner & Kluth P.A.
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