Drug delivery apparatus and method
First Claim
1. A drug delivery apparatus having a distal end and a proximal end for 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 delivering a drug to said target area, said drug delivery means having a fluid delivery passageway for delivering said drug to said distal end, an outer wall and a selectively permeable microporous outer membrane portion proximate said distal end of said drug delivery apparatus, said microporous outer membrane further comprising pores sized from about 10 Å
to about 1 micron and at least one impermeable end portion to enhance precise delivery of said drug to said internal target area; and
(c) phoresis means for assisting the transport of said drug across said selectively permeable microporous 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.
1061 Citations
17 Claims
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1. A drug delivery apparatus having a distal end and a proximal end for 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 delivering a drug to said target area, said drug delivery means having a fluid delivery passageway for delivering said drug to said distal end, an outer wall and a selectively permeable microporous outer membrane portion proximate said distal end of said drug delivery apparatus, said microporous outer membrane further comprising pores sized from about 10 Å
to about 1 micron and at least one impermeable end portion to enhance precise delivery of said drug to said internal target area; and(c) phoresis means for assisting the transport of said drug across said selectively permeable microporous outer membrane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A drug delivery apparatus for local delivery of a drug to an internal body passageway having an elongated passageway wall comprising:
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(a) a flexible catheter having a distal end and a proximal end; (b) drug delivery means connected to said catheter for delivery of a drug to said passageway wall, said drug delivery means comprising a balloon near said distal end of said flexible catheter for engagement with a local area of said passageway wall, said balloon having an outer wall with a selectively permeable microporous membrane portion and a drug delivery chamber within said balloon, a drug delivery lumen extending from said drug delivery chamber to said proximal end of said flexible catheter and a drug recovery lumen extending from said drug delivery chamber to said proximal end of said flexible catheter, said microporous membrane portion of said outer wall further comprising pores sized from about 10 Å
to about 1 micron and at least one impermeable end portion to enhance precise delivery of said drug to said local area of said passageway wall; and(c) phoresis means for assisting the transport of said drug across said selectively permeable microporous membrane portion of said outer wall. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification