Patent ID: 8556191

Claim:
A device configured to spray either a cosmetic or a dermatological composition, the device comprising: the cosmetic or dermatological composition; a sonotrode; a casing comprising a portion terminating in an opening defined by an external surface of the device; and an airflow generator configured to blow air via the opening, wherein the sonotrode comprises a composition feed channel and has an end collar defining an ejection surface for ejecting particles of the cosmetic or dermatological composition, the ejection surface projecting outside the device from the opening by a distance, wherein the end collar is bendable under the effect of vibration of the sonotrode and the ratio of a greatest diameter of the end collar divided by a thickness of the end collar ranges from 12 to 32, wherein the sonotrode comprises a portion of outside cross section that decreases towards the ejection surface, and wherein the composition feed channel feeds the ejection surface via a single outlet orifice and comprises a first diameter portion connected to a second diameter portion that is narrower than the first diameter portion and that opens out to the ejection surface at the outlet orifice.