| 摘要 |
A syringe nasal sprayer (20) includes an elongate barrel (21) having an open proximal end (22), a chamber (23) for retaining fluid and a tip portion (25) extending from a distal end (27) of the barrel (21) having a passageway (28) therethrough communicating with the chamber (23). A stopper (29) is slidably positioned in fluid-tight engagement inside the barrel (21). An elongate plunger rod (31) projects proximally from the stopper (29) and extends outwardly from the open proximal end (22) of the barrel (21). A spray nozzle (37) extends outwardly from the tip portion (25) and includes a conduit (39) therethrough in fluid communication with the passageway (28). A distal end (40) of the nozzle (37) includes a spray aperture (41) in fluid communication with the conduit (39). The nozzle (37) also includes an internal valve (45) for allowing liquid under pressure in the chamber (23) to flow distally through the conduit (39) and through the aperture (41) while preventing unpressurized liquid in the chamber (23) from flowing through the aperture (41). |
