Methods and systems for delivering substances into luminal walls
View Patent ↗Angioplasty and other dilatation devices are provided with scoring elements which incorporate a drug to be delivered to a body lumen, typically a blood vessel. The non-cutting scoring elements have drugs and other active substances coated over a portion thereof or incorporated within internal structure of the element so that the drug is released into the luminal wall closely associated diseased regions of the body lumen as the non-cutting scoring structure is radially expanded into the wall.
1. A method for delivering an active substance to a luminal site, said method comprising:
positioning a plurality of non-cutting scoring elements having a rectangular cross-section with a flat surface and outward edges within a body lumen, wherein the active substance is coated over at least a portion of an exposed surface of the scoring element and wherein the scoring elements form an expandable shell within which is positioned an inflatable balloon, the scoring elements being disposed around but not fixed to the balloon; and
inflating the balloon to cause expansion of the expandable shell thereby penetrating the flat surface and outward edges of the scoring elements into a wall of the body lumen at said luminal site;
wherein the active substance is released from the surface of the scoring element into the wall at the luminal site as a result of the penetration.
2. A method as in claim 1 , wherein the body lumen is a blood vessel, a vein graft, a synthetic graft, or a lumen in the respiratory, urinary, reproductive or digestive systems.
3. A method as in claim 2 , wherein the body lumen is a blood vessel.
4. A method as in claim 3 , wherein the luminal site is at least partly occluded with thrombus.
5. A method as in claim 3 , wherein the luminal site is at least partly occluded with plaque or with hardened plaque.
6. A method as in claim 1 , wherein positioning comprises intraluminally positioning a catheter which carries the non-cutting scoring elements.
7. A method as in claim 6 , wherein the catheter is positioned over a guide wire.
8. A method as in claim 1 , wherein penetrating the advancing comprises radially advancing the flat surface and outward edges of the scoring elements.
9. A method as in claim 8 , wherein the scoring elements are elongate.
10. A method as in claim 8 , wherein the scoring elements have a helical geometry.
11. A method as in claim 1 , wherein the active substance comprises one or more of an antiproliferative agent, an antimitotic agent, an antiplatelet agent, an alkylating agent, an antimetabolite, a platinum coordination complex, a hormone, an anticoagulant, a fibrinolytic agent, an antimigratory agent, an antisecretory agent, an anti-inflammatory agent, indole and acetic acids, an immunosuppressive agent, an angiogenic agent, an angiotensin receptor blocker, a nitric oxide donor, an anti-sense oligonucleotide, a cell cycle inhibitor, a retinoid, a cyclin/CDK inhibitor, an HMG co-enzyme reductase inhibitor, and a protease inhibitor.
12. A method as in claim 3 , wherein the active substance comprises an antiproliferative drug.
13. A method as in claim 3 , wherein the active substance comprises a thrombolytic drug.
14. A method as in claim 1 , wherein the active substance comprises is coated over the scoring element.
15. A method as in claim 1 , wherein the drug is incorporated in a polymeric carrier which is coated over the scoring element.