A single use delivery device for delivering a reconstituted fluid agent to a patient, said single use delivery device comprising: a base member comprising: a proximal end and a distal end, said distal end having an outlet port configured to provide a reconstituted fluid agent for delivery to a patient; a channel providing a fluid pathway extending a length from said proximal end to said outlet port; a one-way valve positioned within said fluid pathway of said channel, said one-way valve configured to limit fluid flow to an antegrade direction from said proximal end toward said outlet port; and a top member coupled to said base member, said top member comprising: a first compressible reservoir member in fluid communication with said fluid pathway of said channel and having a diluent stored within an interior volume thereof; and a second compressible reservoir member in fluid communication with said fluid pathway of said channel and having a reconstitutable agent stored within an interior volume thereof, characterised in that interior volumes of said first and second compressible reservoir members (30a, b) are separated from one another by the one-way valve; wherein, upon application of a compression force to said first compressible reservoir member, said diluent is expelled therefrom and passes through said one-way valve and into said interior volume of said second reservoir member to enable mixing of said diluent with said agent to thereby reconstitute said agent; wherein said second compressible reservoir member is configured to expel said reconstituted fluid agent into said fluid pathway and through said outlet port in response to a compression force applied thereto. a base member comprising: a proximal end and a distal end, said distal end having an outlet port configured to provide a reconstituted fluid agent for delivery to a patient; a channel providing a fluid pathway extending a length from said proximal end to said outlet port; a one-way valve positioned within said fluid pathway of said channel, said one-way valve configured to limit fluid flow to an antegrade direction from said proximal end toward said outlet port; and a proximal end and a distal end, said distal end having an outlet port configured to provide a reconstituted fluid agent for delivery to a patient; a channel providing a fluid pathway extending a length from said proximal end to said outlet port; a one-way valve positioned within said fluid pathway of said channel, said one-way valve configured to limit fluid flow to an antegrade direction from said proximal end toward said outlet port; and a top member coupled to said base member, said top member comprising: a first compressible reservoir member in fluid communication with said fluid pathway of said channel and having a diluent stored within an interior volume thereof; and a second compressible reservoir member in fluid communication with said fluid pathway of said channel and having a reconstitutable agent stored within an interior volume thereof, characterised in that interior volumes of said first and second compressible reservoir members (30a, b) are separated from one another by the one-way valve; wherein, upon application of a compression force to said first compressible reservoir member, said diluent is expelled therefrom and passes through said one-way valve and into said interior volume of said second reservoir member to enable mixing of said diluent with said agent to thereby reconstitute said agent; wherein said second compressible reservoir member is configured to expel said reconstituted fluid agent into said fluid pathway and through said outlet port in response to a compression force applied thereto. a first compressible reservoir member in fluid communication with said fluid pathway of said channel and having a diluent stored within an interior volume thereof; and a second compressible reservoir member in fluid communication with said fluid pathway of said channel and having a reconstitutable agent stored within an interior volume thereof, characterised in that interior volumes of said first and second compressible reservoir members (30a, b) are separated from one another by the one-way valve; wherein, upon application of a compression force to said first compressible reservoir member, said diluent is expelled therefrom and passes through said one-way valve and into said interior volume of said second reservoir member to enable mixing of said diluent with said agent to thereby reconstitute said agent; wherein said second compressible reservoir member is configured to expel said reconstituted fluid agent into said fluid pathway and through said outlet port in response to a compression force applied thereto.