Telescoping syringe with one-way valve

A telescoping syringe comprising:

• (a) a barrel;
• (b) a plunger extendible from and retractable into said barrel, said plunger defining a first reservoir, said barrel defining a second reservoir as said plunger is extended from said barrel;
• and
• (c) a one-way valve disposed at one end of said plunger adjacent to a nipple extending from said barrel, a first sealing interface provided by said one-way valve and a distal wall along said barrel adjacent to said nipple, a second sealing interface provided by an annular flange along said one-way valve and an annular groove along said plunger, a third sealing interface provided by said one-way valve and a circumferential end of said plunger;
• wherein:
• said first sealing interface, said second sealing interface, and said third sealing interface are closed prior to extension of said plunger from said barrel thereby preventing a gas from entering and a fluid from exiting said first reservoir;
• said first sealing interface, said second sealing interface, and said third sealing interface are open when said plunger is extended from said barrel so that said gas enters said first reservoir via at least one inlet along said annular groove and said fluid is communicated into said second reservoir via at least one outlet along said one-way valve;
• said second sealing interface and said third sealing interface are closed when said plunger is retracted into said barrel thereby allowing said fluid to exit said second reservoir via said nipple.