Nasal delivery devices
A nasal delivery device for and a method of delivering substance to a nasal airway of a subject, the nasal delivery device including a mouthpiece ( 519 ) through which the subject in use exhales to cause closure of the oropharyngeal velum of the subject; a nosepiece ( 517 ) for fitting to a nostril of a subject, the nosepiece including a nozzle ( 549 ) through which the substance is in use delivered to the nasal airway; and a manually-actuatable substance supply unit ( 520 ) for delivering substance through the nozzle of the nosepiece.
1. A method of delivering substance to a nasal airway of a subject, comprising:
fitting a nosepiece of a delivery device to a nostril of the subject, the delivery device including a manually-actuatable substance supply unit for delivering the substance through a nozzle disposed within the nosepiece, and a flow regulator configured, with actuating movement of the substance supply unit, to regulate one or more flow characteristics of an exhalation air flow as delivered through the nosepiece, the flow regulator including an aperture into which extends a movable part of the substance supply unit, such that, with actuating movement of the substance supply unit, an effective area of a flow channel to the nosepiece has a predetermined profile over the actuating movement of the substance supply unit; and
manually actuating the substance supply unit to deliver the substance to the nasal airway of the subject, the exhalation air flow having the one or more regulated flow characteristics.
2. The method of claim 1 , wherein the nosepiece fitting comprises fitting the nosepiece to the nostril of the subject so that the nosepiece is in sealing engagement with the nostril of the subject.
3. The method of claim 1 , further comprising:
closing the oropharyngeal velum of the subject.
4. The method of claim 3 , wherein the delivery device further comprises a mouthpiece, and the oropharyngeal velum closing comprises the subject exhaling through the mouthpiece so as to close the oropharyngeal velum of the subject.
5. The method of claim 1 , wherein the delivery device further comprises a valve assembly fluidly connected to a mouthpiece and the nosepiece, and operable between a closed configuration in which there is no fluid communication path between the mouthpiece and the nosepiece and an open configuration on actuation of the substance supply unit, whereby the exhalation air flow is delivered through the nosepiece on actuation of the substance supply unit.
6. The method of claim 1 , wherein the one or more regulated flow characteristics comprise flow rate, flow profile and flow duration of the exhalation air flow.
7. The method of claim 1 , wherein the substance is a liquid.
8. The method of claim 1 , wherein the substance is oxytocin.