AEROSOL CREATED BY DIRECTED FLOW OF FLUIDS AND DEVICES AND METHODS FOR PRODUCING SAME

• US 20070102533A1
• Filed: 12/22/2006
• Published: 05/10/2007
• Est. Priority Date: 06/11/1999
• Status: Abandoned Application

• Current Assignee: Aradigm Corporation, Universidad de Sevilla
• Original Assignee: Aradigm Corporation Universidad de Sevilla
• Inventors: Ganan-Calvo, Alfonso, ROSELL, JOAN
• Application Number:
  US11/615,732
• Publication Number:
  US 20070102533A1
• Time in Patent Office: Days
• US Class Current: 239/8
• CPC Class Codes: A61M 11/06 of the injector type
• CPC Class Codes: A61M 15/0003 with means for dispensing more than one drug
• CPC Class Codes: B05B 1/005 Nozzles or other outlets specially adapted for discharging one or more gases
• CPC Class Codes: B05B 7/0408 with arrangements for mixing two or more liquids
• CPC Class Codes: B05B 7/0433 with one inner conduit of gas surrounded by an external conduit of liquid upstream the mixing chamber
• CPC Class Codes: B05B 7/0458 the gas and liquid flows being perpendicular just upstream the mixing chamber
• CPC Class Codes: B05B 7/0475 with means for deflecting the peripheral gas flow towards the central liquid flow B05B7/0458 takes precedence
• CPC Class Codes: F23D 11/104 intersecting at a sharp angle, e.g. Y-jet atomiser

Abstract

A method of creating small particles by a technology referred to here as “violent focusing” is disclosed, along with devices for generating such violent focusing. In general, the method comprises the steps of forcing a first fluid out of an exit opening of the feeding channel to create a fluid stream. The exit opening is positioned such that the fluid flowing out of the channel flows toward and out of an exit orifice of a pressure chamber which surrounds the exit opening of the feeding channel, and is filled with an atomizing fluid. An atomizing fluid such as a gas is directed towards the first fluid stream in approximately orthogonal directions and surrounding the circumference of the first fluid stream from all sides. The first fluid flow is broken into particles which have dimensions which are smaller than the dimensions of this fluid stream.

Claims

1-26. -26. (canceled)

27. A device for producing aerosolized particles of a pharmaceutically active drug for delivery to a patient comprising:

a container having therein a liquid formulation comprising a pharmaceutically active drug;

an exit opening of the container through which the liquid formulation is forced;

a gas filled pressure chamber which surrounds the exit opening of the container into which the liquid formulation is forced;

an opening in the pressure chamber positioned substantially directly in front of the liquid supply exit opening;

an energy source which forces liquid from the exit opening and gas from the pressure chamber opening which gas destabilizes the liquid so as to form particles of the liquid.

28. The device of claim 27, wherein the energy source causes the gas to rapidly converge toward the liquid along streamlines that form an angle of 45°

or greater with respect to the liquid.

29. The device of claim 27, wherein the exit opening of the liquid supply has a diameter in the range of about 5 to about 10,000 microns,

wherein the exit opening of the container is positioned at a distance in a range of from about 5 to about 10,000 microns from the opening in the pressure chamber.

30. The device of claim 27, wherein the device is portable and weighs less than 1 kilogram.

31. The device of claim 27, wherein the exit opening of the pressure chamber has a diameter in the range of about 5 to about 10,000 micro-meters.

32. The device of claim 27, wherein the exit opening of the pressure chamber has a diameter in the range of about 15 to about 400 micro-meters.

33. The device of claim 27, wherein the exit opening of the container has a diameter in the range of about 15 to about 300 micrometers.

34. The device of claim 33, wherein the exit opening of the container is positioned at a distance in a range of from about 15 to about 300 micro-meters from the opening in the pressure chamber.

35. The device of claim 27, wherein the gas is chosen from:

air, nitrogen, carbon dioxide, helium, argon, and a mixture thereof.

36. The device of claim 35, wherein the gas is comprised of carbon dioxide.

37. The device of claim 27, wherein the liquid formulation is a suspension.

38. The device of claim 37, wherein the suspension comprises liposomes.

39. The device of claim 27, wherein the drug is dissolved in a solvent chosen from water, ethanol and mixtures thereof.

40. A system for producing aerosolized particles of a pharmaceutically active drug, comprising a plurality of aerosol generating devices, wherein each device comprises:

a container having therein a liquid formulation comprising a pharmaceutically active drug;

an exit opening of the container through which the liquid formulation is forced;

a gas filled pressure chamber which surrounds the exit opening of the container into which the liquid formulation is forced;

an opening in the pressure chamber positioned substantially directly in front of the liquid supply exit opening;

an energy wave which forces liquid from the exit opening and gas from the pressure chamber opening which destabilizes the liquid so as to form particles of the liquid.

41. A method of generating an aerosol, comprising the steps of:

forcing a liquid formulation comprised of a pharmaceutically active drug through a feeding supply channel and out of an exit opening thereby forming a liquid stream;

filling a pressure chamber with a gas which chamber is in fluid connection with the exit opening of the feeding supply channel;

forcing the gas toward and into the liquid stream in a manner which reduces the circumference of the liquid stream and breaks the liquid stream into particles having a diameter less than the diameter of the exit opening of the feeding supply channel; and

allowing the gas to exert force on the liquid stream and force particles of the liquid out of an exit orifice of the pressure chamber positioned downstream of a direction of flow of the liquid stream.

42. The method of claim 41, wherein the particles formed comprise particles of 1-5 micrometers in aerodynamic diameter.

43. The method of claim 41, further comprising:

inhaling the particles into a patient'"'"'s lungs.

44. The method of claim 41, wherein liquid of the particles evaporates to leave dry particles.

45. The method of claim 41, wherein the particles formed comprise particles of 1-3 micrometers in diameter.

46. A method comprising:

forcing a first liquid formulation comprised of a pharmaceutically active drug through a feeding supply means and out of an exit opening of the feeding supply means as a first liquid stream;

filling a pressure chamber with a gas which chamber is in fluid connection with the exit opening of the feeding supply means;

forcing the gas toward and into the first liquid stream circumference in a manner which reduces the circumference of the first liquid stream and breaks the stream into particles having a diameter less than the diameter of the exit opening of the first liquid feeding supply means; and

allowing the gas to exert force on the first liquid stream and force particles of the first liquid out of an exit orifice of the pressure chamber positioned downstream of a direction of the flow of the first liquid stream.

47. The method of claim 46, wherein the gas is forced into the first liquid stream circumference at an angle in a range of from about 15°

C. to about 90°

.

48. The method of claim 46, wherein the gas is forced into the first liquid stream circumference at an angle in a range of from about 45°

C. to about 90°

.

49. The method of claim 46, wherein the gas is forced into the first liquid stream circumference at an angle in a range of from about 90°

±

5°

.