Catheter system for controllably releasing a therapeutic agent at a remote tissue site
First Claim
1. A catheter for applying a therapeutic agent to a tissue site by selectively releasing said therapeutic agent in response to light energy emanating from a source and conducted through at least a portion of said catheter, said catheter comprising:
- a catheter body, said catheter body having a surface including a substrate layer; and
a linker layer, said linker layer being chemically bonded to said substrate layer with the therapeutic agent being chemically bonded to said linker layer, the therapeutic agent being selectively released from said substrate layer by a photolytic chemical reaction occurring in response to exposure to the light energy emanating from the source and conducted through the portion of the catheter.
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Accused Products
Abstract
A catheter having a therapeutic agent chemically bonded to a substrate on its exterior surface using a linker which photolytically releases the agent upon exposure to light energy at an appropriate wavelength. The linker is attached to the substrate via a complementary chemical group, with the opposing end containing an aromatic ring with a nitro group in the ortho position relative to a methyl or ethyl group which is functionalized to accept a complementary bond to the therapeutic agent. The substrate may include materials such as glass, polyamide, polyester, polyolefin, polypropylene, polyurethane, or latex. The therapeutic agent may include peptides, proteins, steroids, carbohydrates, nucleotides, or other aliphatic or heterocyclic products, and may be bonded to a molecular lattice or meshwork to accommodate a high molecular concentration per unit area and the inclusion of ancillary compounds such as markers or secondary emitters.
362 Citations
24 Claims
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1. A catheter for applying a therapeutic agent to a tissue site by selectively releasing said therapeutic agent in response to light energy emanating from a source and conducted through at least a portion of said catheter, said catheter comprising:
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a catheter body, said catheter body having a surface including a substrate layer; and a linker layer, said linker layer being chemically bonded to said substrate layer with the therapeutic agent being chemically bonded to said linker layer, the therapeutic agent being selectively released from said substrate layer by a photolytic chemical reaction occurring in response to exposure to the light energy emanating from the source and conducted through the portion of the catheter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for applying a therapeutic agent to a tissue site, said method comprising the steps of:
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providing a catheter having a catheter body and a surface including a substrate layer; connecting a linker layer and the therapeutic agent to said substrate layer, said linker layer being chemically bonded to said substrate layer, the therapeutic agent being chemically bonded to said linker layer; positioning at least a portion of said catheter body to which the therapeutic agent connected generally proximate to the remotely located tissue site; and applying light energy to said substrate layer or said linker layer such that the therapeutic agent is selectively and responsively released from said substrate layer by a photolyric chemical reaction occurring in response to exposure to said light energy.
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Specification