Ultrasound medical stent coating method and device

• US 20070031611A1
• Filed: 08/04/2005
• Published: 02/08/2007
• Est. Priority Date: 08/04/2005
• Status: Abandoned Application

• Current Assignee: Eilaz Babaev
• Original Assignee: Eilaz Babaev
• Inventors: Babaev, Eilaz
• Application Number:
  US11/197,915
• Publication Number:
  US 20070031611A1
• Time in Patent Office: Days
• US Class Current: 427/600
• CPC Class Codes: A61L 31/14 Materials characterised by their function or physical properties , e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
• CPC Class Codes: B05B 13/0442 Installation or apparatus for applying liquid or other fluent material to separate articles rotated during spraying operation
• CPC Class Codes: B05B 17/0623 coupled with a vibrating horn

Abstract

An ultrasound apparatus and technique produces precise and uniform coatings on various substrates such as stents or other medical devices. The apparatus and technique increases adhesiveness of the surface of the stent or other medical device. In addition, the coating, drying, sterilization processes take place concurrently. The apparatuses generate and deliver targeted, gentle, and highly controllable dispensation of continuous liquid spray. The ultrasound coating apparatuses and techniques provide an instant on-off coating process with no atmospheric therpeutic agent contamination, no “webbing,” no “stringing” or other surface coating anomalies. Furthermore, the technology reduces wastage of expensive pharmaceuticals or other expensive coating materials.

Claims

1. A method for coating at least a portion of one or more stents, comprising:

spinning the stent;

sonicating the stent for adhesivity improvement;

creating at least one targeted, uniform coating spray;

directing and applying a coating onto the stent;

producing at least one precise and uniform coating layer on various substrates; and

sonicating the stent after coating for sterilization.

2. The method of claim 1, further comprising placing the stent in front of the radiating surface of the ultrasonic tip without spray and sonicating for ionization of the air in order to improve surface adhesion prior to coating.

3. The method of claim 1, further comprising placing the stent in front of the radiating surface of the ultrasonic tip with spray and sonicating for ionization of the air in order to improve surface adhesion prior to coating.

4. The method of claim 2, further comprising placing the stent in front of the radiating surface of the ultrasonic tip in a near field without spray and sonicating for ionization of the air in order to improve surface adhesion prior to coating.

5. The method of claim 2, further comprising placing the stent in front of the radiating surface of the ultrasonic tip in the “

far field”

without spray and sonicating for ionization of the air in order to improve surface adhesion prior to coating.

6. The method of claim 2, further comprising placing the stent in front of the radiating surface of the ultrasonic tip in “

near field”

on peak of wave amplitude, without spray and sonicating for ionization of the air to improve surface adhesion prior to coating.

7. The method of claim 2, further comprising placing the stent in front of the radiating surface of the ultrasonic tip in “

far field”

on peak of wave amplitude without spray and sonicating for ionization of the air to improve surface adhesion prior to coating.

8. The method of claim 2, further comprising placing the stent in front of the radiating surface of the ultrasonic tip in “

near field”

between two peaks of wave amplitude, without spray and sonicating for ionization of the air in order to improve surface adhesion prior to coating.

9. The method of claim 2, further comprising placing the stent in front of the radiating surface of the ultrasonic tip in “

near field”

between two peaks of wave amplitude without spray and sonicating for ionization of the air in order to improve surface adhesion prior to coating.

10. The method of claim 1, further comprising placing the stent in front of the radiating surface of the ultrasonic tip in the near field-far field interface and sonicating with no spray for ionization of the air in order to improve surface adhesion prior to coating.

11. The method of claim 1, further comprising spinning the stent.

12. The method of claim 2, further comprising immobilizing the stent.

13. The method of claim 7, further comprising oscillating the distance between the radiating surface of the ultrasonic tip and the stent and spinning the stent.

14. The method of claim 8, further comprising oscillating the distance between the radiating surface of the ultrasonic tip and the stent and immobilizing the stent.

15. The method of claim 2, further comprising spraying the stent with coating material immediately after ionizing the air.

16. The method of claim 2, further comprising placing the stent in front of radiating surface of the ultrasonic tip and spraying the coating material.

17. The method of claim 2, further comprising placing the stent in front of radiating surface of the ultrasonic tip in the near field and spraying the coating material.

18. The method of claim 2, further comprising placing the stent in front of radiating surface of the ultrasonic tip in the far field and spraying the coating material.

19. The method of claim 2, further comprising placing the stent in front of the radiating surface of the ultrasonic tip in the near field-far field interface and spraying the coating material.

20. The method of claim 2, further comprising placing the stent in front of the radiating surface of the ultrasonic tip and oscillating the distance between the radiating surface of the ultrasonic tip and the stent while spraying the coating material.

21. The method of claim 16, further comprising starting the coating process in the far field and completing the coating process in the near field.

22. The method of claim 16, further comprising starting the coating process in the near field and completing the coating process in the far field.

23. The method of claim 16, further comprising starting the coating process in the far field and completing the coating process in between two peaks of wave amplitude.

24. The method of claim 16, further comprising starting coating in the near field and completing coating in the far field in between two peaks of wave amplitude.

25. The method of claim 16, further comprising beginning the coating process in the near field and completing the coating process in the near field-far field interface.

26. The method of claim 16, further comprising beginning the coating process in the near field and finishing the coating process in the far field on the peak of wave amplitude and spinning the stent.

27. The method of claim 1, further comprising sonicating the stent and spinning the stent following the completion of the coating process in order to dry the stent.

28. The method of claim 1, further comprising sonicating the stent and spinning the stent immediately following the completion of the coating process in order to sterilize the stent.

29. The method of claim 1, further comprising sonicating the stent and spinning the stent immediately following the completion of the coating process in order to simultaneously dry and sterilize the stent.

30. The method of claim 1, further comprising using different ultrasound wave amplitudes for adhesion improvement, coating, drying, and sterilization.

31. The method of claim 1, wherein the ultrasound frequency range is from 18 KHz to 60 MHz.

32. The method of claim 1, wherein the preferred range of ultrasound frequency is from 18 KHz to 200 KHz.

33. The method of claim 1, wherein the most preferable range of ultrasound frequency is from 18 KHz to 60 KHz.

34. The method of claim 1, wherein the recommended ultrasound frequency is about 50 KHz.

35. The method of claim 1, further comprising use of different ultrasound wave frequencies for adhesion improvement, coating, drying, and sterilization.

36. The method of claim 1, wherein the coating is a therapeutic agent.

37. The method of claim 1, wherein the coating is a polymer.

38. The method of claim 1, wherein coating is a mixture or combination of polymer and therapeutic agent.

39. A device for coating at least a portion of at least one stent, comprising:

a. An ultrasound transducer having a tip;

b. An ultrasound transducer tip having radiating surface for emitting ultrasound energy; and

c. An ultrasound transducer tip having landing space on radiating surface of tip, providing liquid on, to produce spray without dripping.

40. A device of claim 40, wherein the ultrasound transducer frequency range is from 18 KHz to 60 MHz.

41. A device of claim 40, wherein the ultrasound transducer frequency range is from 18 KHz to 60 KHz.

42. A device of claim 40, wherein the ultrasound transducer operates at about a 50 KHz frequency.

43. A device of claim 40, wherein the ultrasonic tip'"'"'s distal end amplitude range is from 3 microns to 300 microns.

44. A device of claim 40, wherein the ultrasonic tip'"'"'s distal end amplitude is about 40 microns.

45. A device of claim 40, wherein the ultrasonic tip'"'"'s distal end is rounded.

46. A device of claim 40, wherein the ultrasonic tip'"'"'s distal end is rectangular.

47. The device of claim 40, wherein the ultrasonic tip'"'"'s distal end has a landing space.

48. A device of claim 40, wherein the ultrasonic tip'"'"'s distal end is a combination of different geometrical shapes and has a landing space.

49. A device of claim 40, wherein the ultrasonic tip has a central or axial orifice.

50. A device of claim 40, wherein the ultrasound transducer'"'"'s driving signals are sinusoidal.

51. A device of claim 40, wherein the ultrasound transducer'"'"'s driving signals are rectangular or trapezoidal.