System and method for loading a beneficial agent into a medical device
View Patent ↗The beneficial agent is applied into the holes in a medical device in a dry particulate form and is adhered in the hole in a manner that allows release of the drug in a controlled manner. The drug material would be formed into particles and placed in the holes. The solvent would be added to partially liquefy and adhere the drug into the holes. After application of the solvent, the particles are adhered together in a substantially uniform drug containing matrix. The particles may include drug alone or drug in combination with other materials including a matrix.
1. A method for loading a medical device with a beneficial agent, the method comprising:
providing a medical device with a plurality of holes;
delivering a plurality of particles of drug into the plurality of holes in a dry form; and
delivering a liquefying substance into the plurality of holes, wherein the liquefying substance liquefies at least a portion of the particles and adheres the drug in the holes and is delivered into the plurality of holes before the particles are delivered to the holes.
2. The method of claim 1 , wherein the plurality of particles of drug comprise spheres of drug.
3. The method of claim 2 , wherein the spheres are sized to fit with a single sphere per hole.
4. The method of claim 2 , wherein the spheres comprise a drug core and a polymer shell.
5. The method of claim 2 , wherein the spheres comprise a mixture of drug and carrier.
6. The method of claim 2 , wherein the spheres have a size of about 0.0001 to about 0.05 inches.
7. The method of claim 1 , wherein the plurality of particles include a carrier.
8. The method of claim 7 , wherein the carrier is a polymer.
9. The method of claim 8 , wherein the plurality of particles of drug and polymer comprise a powder.
10. The method of claim 1 , wherein the liquefying substance is a solvent.
11. The method of claim 1 , wherein the particles are delivered into the holes in a plurality of layers.
12. The method of claim 1 , wherein the particles are delivered into the holes by an electrostatic process.
13. The method of claim 1 , wherein the liquefying substance is delivered into the plurality of holes in a dropwise manner.
14. The method of claim 12 , wherein the liquefying substance is delivered into the plurality of holes by a computer controlled jetting process.
15. The method of claim 1 , wherein the particles are delivered into the plurality of holes by immersion of the medical device into the particles.
16. A method for loading a medical device with a beneficial agent, the method comprising:
providing a medical device with a plurality of holes;
forming a plurality of particles comprising a beneficial agent, wherein the particles are sized to fit as a plug with a single particle in each of the plurality of holes;
delivering the plurality of particles into the plurality of holes; and
securing the particles in the holes.
17. The method of claim 16 , wherein the particles are secured in the holes by backfilling with a liquid agent.
18. The method of claim 16 , wherein the particles are secured in the holes by a liquid agent which liquefies at least a portion of the particles.
19. The method of claim 16 , wherein the particles are spheres.
20. The method of claim 16 , wherein the particles include a carrier.
21. The method of claim 20 , wherein the carrier is a polymer.
22. The method of claim 16 , wherein the particles are conical plugs.