Patent ID: 7296566

Claim:
A nasal delivery device for delivering liquid substances including drug and vaccines to a nasal passage, comprising: a syringe having a rigid body with an outlet opening at one end; a separate spray nozzle including: a rigid cap body having an internal passage extending between an inlet opening at one end and a spray aperture at a distal end, said cap body being sealingly secured to the syringe body adjacent the outlet opening; and a valve having a skirt portion surrounding a base, the skirt portion movable from a first position in contact with an internal wall of the internal passage to a second position spaced from the internal wall of the internal passage when substances pressurized at or above a minimum threshold pressure flows from the inlet opening, so that only pressurized substances at or above the minimum pressure threshold level flow through the passage into and out of the spray aperture and so that substances below the minimum threshold pressure are prevented from flowing through the spray aperture, wherein the valve is configured to operate in two directions and wherein the valve defines at least one passage through the skirt portion allowing fluid to be drawn through the valve and into the syringe.