depressing said plunger into said cylindrical passage of said syringe body to eject said fluid from said syringe body, thereby bringing said thrust plate closer to, but still outside of said distal end of said syringe body, and engaging said first lock element on said plunger with {HEAD ~ said second lock element} in said {TAIL ~ cylindrical passage} to prevent removal of said plunger from said cylindrical passage 
in
depressing said plunger into said cylindrical passage of said syringe body to eject said fluid from said syringe body , thereby bringing said thrust plate closer to , but still outside of said distal end of said syringe body , and engaging said first lock element on said plunger with { HEAD ~ said second lock element } in said { TAIL ~ cylindrical passage } to prevent removal of said plunger from said cylindrical passage
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