Metal working – Method of mechanical manufacture – Shaping one-piece blank by removing material
Reexamination Certificate
1999-10-18
2001-07-03
Hughes, S. Thomas (Department: 3726)
Metal working
Method of mechanical manufacture
Shaping one-piece blank by removing material
C424S422000, C424S423000, C623S001100, C623S001150, C219S121720, C419S038000
Reexamination Certificate
active
06253443
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to stents for maintaining the patency of body passages. Additionally, the stents may serve as drug delivery vehicles. The invention has particular application to stenting in blood vessels of the human body and will be described with reference thereto. However, in a broader sense it relates to stenting in any body passage, including such passages as the gastrointestinal tract, urethral and ureteral tracts, bronchial and esophageal tracts. The invention also has particular reference to stents comprising compounds useful for the treatment and prevention of restenosis and also will find application in dilating and maintaining the patency of various body passages such as ureters and the like.
SUMMARY OF THE INVENTION
In accordance with the present invention, a porous stent made from a powdered metal or polymeric material is disclosed. The inventive stent is an expandable intraluminal stent comprising a main body portion having a first end, a second end and a flow passage defined therethrough, the main body portion being sized for intraluminal placement within a body passage and subsequent expansion for implantation. The main body portion of the stent of the present invention is further characterized in that it is formed at least in part of at least one porous material, the porous material having been formed from a powdered metal or polymeric material.
In another embodiment of the present invention, a drug is contained within the pores of the stent for delivery to the body.
In another embodiment of the present invention, the stent may be coated with a drug.
In another embodiment of the present invention, the stent is comprised of at least two porous metals.
The present invention is also directed to a method for making a porous expandable intraluminal stent comprising the steps of providing a powdered material, subjecting the powdered material to high pressure to form a compact, sintering the compact to form a final porous material and forming a stent from the porous material. In another embodiment of the above-mentioned inventive method, at least one drug is loaded into the pores of the stent.
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Cozart Jermie E.
Hughes S. Thomas
Sci-Med Life Systems, Inc.
Vidas Arrett & Steinkraus
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