Drug delivery apparatus and method
First Claim
1. A drug delivery apparatus having a distal end and a proximal end for radially restricted local delivery of a drug to internal body tissue comprising:
- (a) a flexible catheter for insertion into an internal target area of a body;
(b) drug delivery means connected to said catheter for radially restricted delivery of a drug to said internal body tissue, said drug delivery means comprising;
(1) a fluid delivery passageway and a drug delivery chamber proximate said distal end of said drug delivery apparatus, said drug delivery chamber having an outer wall with a selectively permeable outer membrane portion; and
(2) a non-permeable balloon affixed to and surrounding a portion of said drug delivery chamber, said balloon, when inflated, securing said drug delivery chamber at an internal body tissue target area and radially restricting local delivery of said drug by providing intimate contact between said balloon and a portion of said internal body tissue; and
(c) means for assisting the transport of said drug across said selectively permeable outer membrane.
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Accused Products
Abstract
A drug delivery apparatus and method for delivering a drug locally to internal body tissue. The invention contemplates positioning a drug delivery device in a body passageway or within body tissue and then selectively introducing a selected drug so that it is transported across a drug transport wall of the device for direct contact with the passageway wall or body tissue. A further aspect of the present invention involves treating a dilated vessel in the area of a stenotic lesion with a fixative or other drug to render the vessel biologically inert and to form a biological stent or prevent restenosis using specifically selected drugs. A still further aspect of the present invention involves treating a tumor or local or regional tissue mass with antitumor sensitizing agents, biological modifiers, antibiotics or other types of drugs by delivery of the drug to the tumor or tissue area directly or through the passageway wall.
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Citations
21 Claims
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1. A drug delivery apparatus having a distal end and a proximal end for radially restricted local delivery of a drug to internal body tissue comprising:
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(a) a flexible catheter for insertion into an internal target area of a body; (b) drug delivery means connected to said catheter for radially restricted delivery of a drug to said internal body tissue, said drug delivery means comprising; (1) a fluid delivery passageway and a drug delivery chamber proximate said distal end of said drug delivery apparatus, said drug delivery chamber having an outer wall with a selectively permeable outer membrane portion; and (2) a non-permeable balloon affixed to and surrounding a portion of said drug delivery chamber, said balloon, when inflated, securing said drug delivery chamber at an internal body tissue target area and radially restricting local delivery of said drug by providing intimate contact between said balloon and a portion of said internal body tissue; and (c) means for assisting the transport of said drug across said selectively permeable outer membrane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A drug delivery apparatus having a distal end and a proximal end for radially restricted local delivery of a drug to internal body tissue comprising:
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(a) a flexible catheter for insertion into an internal target area of a body; (b) drug delivery means connected to said catheter for radially restricted delivery of a drug to said internal body tissue, said drug delivery means comprising; (1) a drug delivery chamber proximate said distal end of said drug delivery apparatus, said drug delivery chamber having a drug delivery area with a selectively permeable outer membrane portion and circumferential lips immediately adjacent the proximal and distal ends of the drug delivery area that act to minimize movement of a drug beyond a segment of internal tissue, and a fluid delivery passageway extending from said drug delivery chamber to the proximal end of said catheter; and (2) a non-permeable balloon affixed to and surrounding a portion of said drug delivery chamber, said balloon, when inflated, securing said drug delivery chamber at an internal body tissue target area and radially restricting local delivery of said drug by providing intimate contact between said balloon and a portion of said internal body tissue; and (c) means for assisting the transport of said drug across said selectively permeable outer membrane without application of pressure. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A drug delivery apparatus having a distal end and a proximal end for radially restricted local delivery of a drug to internal body tissue comprising:
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(a) a flexible catheter for insertion into an internal target area of a body; (b) drug delivery means connected to said catheter for radially restricted delivery of a drug to said internal body tissue, said drug delivery means comprising; (1) a drug delivery chamber proximate said distal end of said drug delivery apparatus, said drug delivery chamber having a drug delivery area with a selectively permeable microporous outer membrane portion and circumferential lips immediately adjacent the proximal and distal ends of the drug delivery area that act to minimize movement of a drug beyond a segment of internal tissue, and a fluid delivery passageway extending from said drug delivery chamber to the proximal end of said catheter, and a drug recovery lumen extending from said drug chamber to the proximal end of said flexible catheter; and (2) a non-permeable balloon affixed to and surrounding a portion of said drug delivery chamber, said balloon, when inflated, securing said drug delivery chamber at an internal body tissue target area and radially restricting local delivery of said drug by providing intimate contact between said balloon and a portion of said internal body tissue; and (c) means for assisting the transport of said drug across said selectively permeable outer membrane without application of pressure.
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Specification