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 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 scoring structure is radially expanded into the wall.
1. A method for delivering an active substance to a luminal site, the method comprising:
providing a device comprising:
a catheter body having a proximal end and a distal end;
an expandable shell;
a scoring structure having a proximal end and a distal end, comprising at least one scoring element disposed near the distal end of the catheter body and over the expandable shell, wherein one of the proximal end and the distal end of the scoring structure is fixed to the catheter body and the other of the proximal end and the distal end of the scoring structure is axially slidable with respect to the expandable shell;
an active substance carried by the at least one scoring element;
positioning the at least one scoring element within a body lumen; and
expanding the expandable shell to cause movement of the at least one scoring element, the at least one scoring element thereby penetrating an occlusion at the luminal site within the body lumen, the active substance being released from the at least one scoring element into the occlusion at the luminal site as a result of the penetration.
2. The method of claim 1 , whereupon expanding the expandable shell to cause movement of the at least one scoring element, the at least one scoring element penetrates through the occlusion and into a wall of the body lumen.
3. The method of claim 1 , wherein the body lumen is a blood vessel.
4. The method of claim 3 , wherein the blood vessel is a coronary blood vessel.
5. The method of claim 3 , wherein the blood vessel is a peripheral blood vessel.
6. The method of claim 1 , wherein the occlusion comprises thrombus.
7. The method of claim 1 , wherein the occlusion comprises plaque.
8. The method of claim 1 , wherein the at least one scoring element radially advances as a result of expanding the expandable shell.
9. The method of claim 1 , wherein the at least one scoring element is elongate.
10. The method of claim 1 , wherein the at least one scoring element has a helical geometry.
11. The method of claim 1 , wherein the at least one scoring element has a rectangular cross-section.
12. The method of claim 1 , wherein the scoring structure comprises a plurality of scoring elements.
13. The method of claim 1 , wherein the distal end of the scoring structure is fixed to the catheter body and the proximal end of the scoring structure is axially slidable with respect to the expandable shell.
14. The method of claim 1 , wherein the expandable shell comprises a balloon, and expanding the expandable shell comprises inflating the balloon.
15. The method of 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.
16. The method of claim 1 , wherein the active substance comprises an antiproliferative drug.
17. The method of claim 1 , wherein the active substance comprises paclitaxel.
18. The method of claim 1 , wherein the active substance is coated over the at least one scoring element.
19. The method of claim 1 , wherein the active substance is incorporated in a polymeric carrier coated over the at least one scoring element.