Patent ID: 11925749
Assignee: FUNAI ELECTRIC CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 6:
7. A method for reducing a pressure differential on a fluid jet ejection head for a nasal spray device, the method comprising:
providing a pharmaceutical drug delivery device having a fluid outlet nozzle attached to a drug delivery device body; a fluid jet ejection cartridge disposed in the drug delivery device body, the fluid jet ejection cartridge containing the fluid ejection head in fluid flow communication with the fluid outlet nozzle and a pharmaceutical drug in the fluid jet ejection cartridge;
inserting a sealing material between an outer surface of the fluid jet ejection cartridge and an inner surface of the fluid outlet nozzle, wherein the sealing material contains an elongate, serpentine air flow path therein to provide a reduced pressure differential adjacent to a surface of the fluid ejection head upon use of the drug delivery device; and
activating the nasal spray device while flowing air through the drug delivery device body and elongate, serpentine air flow path when the fluid outlet nozzle is inserted into the nasal passage of a user thereby preventing fluid from drooling from the fluid ejection head.