Insert molded aerosol generator and methods

• US 6,554,201 B2
• Filed: 05/02/2001
• Issued: 04/29/2003
• Est. Priority Date: 05/02/2001
• Status: Expired due to Term

• Current Assignee: Novartis Pharma AG (Novartis Ag)
• Original Assignee: Aerogen, Inc. (Nektar Therapeutics)
• Inventors: Thornton, Brian S., Klimowicz, Michael A.
• Primary Examiner(s): DOUGLAS, LISA ANN
• Application Number:
  US09/848,111
• Publication Number:
  US 20020162898A1
• Time in Patent Office: 727 Days
• Field of Search: 239/3, 239/4, 239/10, 239/102.1, 239/102.2, 128/200.23
• US Class Current: 239/4
• CPC Class Codes: A61M 11/005 using ultrasonics spraying or atomising liquids using ultrasonic vibrations in general B05B17/06
• CPC Class Codes: A61M 15/0085 using ultrasonics spraying or atomising liquids using ultrasonic vibrations in general B05B17/06
• CPC Class Codes: B05B 17/0646 Vibrating plates, i.e. plates being directly subjected to the vibrations, e.g. having a piezoelectric transducer attached thereto

Abstract

A method for producing an aerosol generator utilizes a vibratable member having a plurality of apertures for producing liquid droplets upon vibration of the vibratable member. A support member is injection molded about the vibratable member, and a vibratable element is placed in vibrational communication with the vibratable member.

Claims

1. A method for producing an aerosol generator, the method comprising:

providing a vibratable member having a plurality of apertures that are configured to produce liquid droplets upon vibration of the vibratable member, the vibratable member having a front surface, a back surface, and an outer periphery, wherein vibrations of the vibrating member causes the plurality of apertures to be displaced and liquid to move through the apertures from the back side to the front side thereby nebulizing the fluid;

injection molding a support member about the vibratable member, the vibratable member being injection molded to surround the outer periphery of the vibratable member, wherein a center of the vibratable member having the apertures is available for receiving a liquid to be aerosolized; and

placing a vibratable element in vibrational communication with the vibratable member.

2. A method as in claim 1, further comprising placing the vibratable element adjacent to the vibratable member prior to the injection molding step.

3. A method as in claim 1, further comprising coupling the vibratable element to the support member after the injection molding step.

4. A method as in claim 1, further comprising placing a stiffening element between the vibratable member and the vibratable element.

5. A method as in claim 1, further comprising attaching the vibratable element to the stiffening element after the injection molding step.

6. A method as in claim 4, further comprising coupling the stiffening element to the vibratable element and placing the stiffening element adjacent to the vibratable member prior to the injection molding step.

7. A method as in claim 1, wherein the injection molding step further comprises placing at least the vibratable member into a mold and injecting heated material into the mold to form the support member.

8. A method as in claim 7, wherein the heated material comprises a plastic, and wherein the mold has a cup shaped cavity to form the support member in the shape of a cup.

9. A method as in claim 1, wherein the vibratable element comprises an annular piezoelectric element that is disposed about the center of the vibratable member.

10. A method as in claim 4, wherein the stiffening element comprises an annular washer that is concentrically aligned with the vibratable element.

11. A method of nebulizing a fluid, comprising the steps of:

providing a vibrating element and a vibrating member, the vibrating member being vibrated by the vibrating element, the vibrating member having a plurality of apertures extending from a front side to a back side of the vibrating member, the vibrating member also having an outer perhiphery surrounding the plurality of apertures;

injection molding a supporting element around the outer periphery of the vibrating member to embed the outer periphery in the supporting element, the supporting element being injection molded to form an opening in the supporting element with the vibrating member extending across the opening, the supporting element also being injection molded around at least part of the vibrating element;

delivering a fluid to the back side of the vibrating member;

vibrating the vibrating element so that the vibrating member vibrates to displace the plurality of apertures, wherein the fluid at the back side of the vibrating member passes through the plurality of apertures as the plurality of apertures are displaced thereby nebulizing the fluid.

12. A method as in claim 11, further comprising placing the vibratable element adjacent to the vibratable member prior to the injection molding step.

13. A method as in claim 11, further comprising placing a stiffening element between the vibratable member and the vibratable element.

14. A method as in claim 13, further comprising coupling the stiffening element to the vibratable element and placing the stiffening element adjacent to the vibratable member prior to the injection molding step.

15. A method as in claim 11, wherein the molding step is carried out with a mold having a cup shaped cavity to form the support member in the shape of a cup.

16. A method as in claim 11, wherein the vibratable element comprises an annular piezoelectric element that is disposed about the center of the vibratable member.

17. A method as in claim 14, wherein the stiffening element comprises an annular washer that is concentrically aligned with the vibratable element.