A device for the intranasal delivery of a compound comprising: a y-junction including a base, a first branch of the y-junction radiating from the base, a second branch of the y-junction radiating from the base, a third branch of the y-junction radiating from the base, and an internal dose loading channel of the y-j unction; a dose chamber in fluid communication with the third branch of the y-junction; a metered dose pump in fluid communication with the first branch of the y-j unction; a propellant canister containing a liquefied propellant, which propellant canister is in fluid communication with the second branch of the y-junction; where the y-junction establishes fluid paths within the device , and connects the metered dose pump and the propellant canister with the dose chamber ; an actuator grip surrounding the y-junction; a spring associated with the second branch of the y-junction;where the propellant canister is held by the actuator grip and the spring between the propellant canister and the second branch of the y-junction ; a nozzle associated with the dose chamber; and a housing , the y-junction residing within the housing; whereby the device comprises an annular diffuser , which is a porous material and which provides for the conversion of liquefied propellant from the propellant canister to gas; which annular diffuser sits inside a bore on the back end of the dose chamber , where the annular diffuser is in a compression fit with the dose chamber , and the dose loading channel is in compression with an inner bore of the annular diffuser ; and the propellant canister press fits into the second branch of the y-junction , establishing a gas path through internal bores, through the diffuser and to the dose chamber . a y-junction including a base, a first branch of the y-junction radiating from the base, a second branch of the y-junction radiating from the base, a third branch of the y-junction radiating from the base, and an internal dose loading channel of the y-j unction; a dose chamber in fluid communication with the third branch of the y-junction; a metered dose pump in fluid communication with the first branch of the y-j unction; a propellant canister containing a liquefied propellant, which propellant canister is in fluid communication with the second branch of the y-junction; where the y-junction establishes fluid paths within the device , and connects the metered dose pump and the propellant canister with the dose chamber ; an actuator grip surrounding the y-junction; a spring associated with the second branch of the y-junction;where the propellant canister is held by the actuator grip and the spring between the propellant canister and the second branch of the y-junction ; a nozzle associated with the dose chamber; and a housing , the y-junction residing within the housing; whereby the device comprises an annular diffuser , which is a porous material and which provides for the conversion of liquefied propellant from the propellant canister to gas; which annular diffuser sits inside a bore on the back end of the dose chamber , where the annular diffuser is in a compression fit with the dose chamber , and the dose loading channel is in compression with an inner bore of the annular diffuser ; and the propellant canister press fits into the second branch of the y-junction , establishing a gas path through internal bores, through the diffuser and to the dose chamber . <EOS>