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A spray head for spraying a cosmetic or dermatological composition, in particular for application to the human body, may include a sonotrode for transmitting ultrasound vibration from a transducer to an ejection surface for ejecting particles of composition, the sonotrode including a channel for fee

A spray head for spraying a cosmetic or dermatological composition, in particular for application to the human body, may include a sonotrode for transmitting ultrasound vibration from a transducer to an ejection surface for ejecting particles of composition, the sonotrode including a channel for feeding the composition to the ejection surface. The channel may present a narrow portion between a composition inlet into the sonotrode and the composition outlet to the ejection surface.

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1. A spray head configured to spray a cosmetic or dermatological composition on human keratinous material, the spray head comprising: a nozzle body comprising a portion terminating in an opening;an airflow generator configured to blow air through the opening;a transducer for generating ultrasound vi

1. A spray head configured to spray a cosmetic or dermatological composition on human keratinous material, the spray head comprising: a nozzle body comprising a portion terminating in an opening;an airflow generator configured to blow air through the opening;a transducer for generating ultrasound vibration; anda sonotrode for transmitting the ultrasound vibration from the transducer to an ejection surface for ejecting particles of the composition, the sonotrode comprising a channel for feeding the composition from an inlet of the sonotrode to an outlet of the sonotrode,wherein the outlet is surrounded by a collar having a face defining the ejection surface and that projects out of the opening of the nozzle body by a distance, andwherein the channel has a reduced diameter portion that includes the outlet. 2. A spray head according to claim 1, wherein the channel is a single channel and extends along an axis of the sonotrode. 3. A spray head according to claim 1, wherein the reduced diameter portion has a constant cross-section over a distance of at least 1 mm. 4. A spray head according to claim 3, wherein the reduced diameter portion has a constant cross-section over a distance less than or equal to 5 mm. 5. A spray head according to claim 1, wherein the reduced diameter portion has a cross-section that is circular. 6. A spray head according to claim 5, wherein a diameter of the reduced diameter portion ranges from 0.4 mm to 0.8 mm. 7. A spray head according to claim 1, wherein the channel has a cross-section that is circular. 8. A spray head according to claim 1, wherein a minimum cross-sectional area of the reduced diameter portion is less than or equal to 0.8 mm2. 9. A spray head according to claim 1, wherein a diameter of the channel adjacent to the reduced diameter portion ranges from 1 mm to 2 mm. 10. A spray head according to claim 1, wherein a ratio of a length of the reduced diameter portion divided by a total length of the sonotrode ranges from 0.04 to 0.4. 11. A spray head according to claim 1, wherein a ratio of a largest cross-section of the channel divided by a narrowest cross-section of the channel ranges from 1 to 25. 12. A spray head according to claim 1, wherein the channel feeds the ejection surface via a single outlet orifice. 13. A spray head according to claim 1, wherein the sonotrode is made as a single piece and includes an endpiece for connection to a tube for feeding the channel with composition. 14. A spray head according to claim 1, wherein the sonotrode comprises a portion of outside cross-section that decreases towards the ejection surface. 15. A spray head according to claim 14, wherein the sonotrode comprises a frustoconical portion, and wherein an angle at an apex of the frustoconical portion ranges from 15° to 45°. 16. A spray head according to claim 1, wherein the sonotrode comprises a portion that is circularly cylindrical. 17. A spray head according to claim 14, wherein the portion of decreasing outside cross-section connects with a circularly-cylindrical portion of the sonotrode. 18. A spray head according to claim 16, wherein an outside diameter of the circularly-cylindrical portion ranges from 4 mm to 7 mm. 19. A spray head according to claim 18, wherein a length of the circularly-cylindrical portion ranges from 3 mm to 5 mm. 20. A spray head according to claim 1, wherein a minimum thickness of the collar in a region for ejecting particles of composition ranges from 0.4 mm to 0.6 mm. 21. A spray head according to claim 1, wherein an outside diameter of the collar ranges from 7 mm to 13 mm. 22. A spray head according to claim 1, wherein the sonotrode is a machined sonotrode. 23. A spray head according to claim 1, wherein the sonotrode comprises aluminum. 24. A spray head according to claim 13, wherein the endpiece passes through the transducer. 25. A spray head according to claim 1, wherein an excitation frequency of the transducer ranges from 30 kHz to 200 kHz. 26. A device configured to package and spray a cosmetic composition, the device comprising: the spray head as defined in claim 1. 27. A device according to claim 26 further comprising a container containing the composition for spraying. 28. A device according to claim 26, the composition being at least one of a makeup composition, a self-tanning agent, a sunscreen, and a composition including a hair agent. 29. A cosmetic treatment method comprising: spraying a composition on human keratinous material using the spray head as defined in claim 1. 30. A spray head according to claim 1, wherein the sonotrode comprises metal.