Syringe for injecting small measured volumes of liquid

Claim 1

IN A SYRINGE FOR INJECTING SMALL MEASURED VOLUMES OF LIQUID, THE COMBINATION OF A TUBULAR STRUCTURE HAVING A BORE; A NEEDLE HAVING A SMALL BORE COAXIAL WITH SAID TUBULAR STRUCTURE BORE, THE INNER END OF SAID NEEDLE BEING FIXED WITH RESPECT TO SAID TUBULAR STRUCTURE AND THE INNER END OF SAID NEEDLE BORE BEING COMMUNICABLE WITH THE ADJACENT END OF SAID TUBULAR STRUCTURE BORE; MEANS PROVIDING AN INLET PASSAGE OPENING LATERALLY OF SAID BORES INTO THE PORTION OF SAID TUBULAR STRUCTURE BORE ADJACENT SAID INNER END OF SAID NEEDLE FOR INTRODUCING FLUID INTO SAID TUBULAR STRUCTURE BORE PORTION ADJACENT TO THE INNER END OF SAID NEEDLE, A FIRST PLUNGER ELEMENT MOUNTED TO MOVE AXIALLY IN SAID BORES AND BEING WITHDRAWABLE FROM SAID NEEDLE BORE TO PLACE THE INNER END OF SAID NEEDLE BORE INTO COMMUNICATION WITH SAID TUBULAR STRUCTURE BORE PORTION AND BEING PROJECTABLE INTO THE NEEDLE BORE FOR EJECTING LIQUID THEREFROM; AND MEANS INCLUDING A SECOND PLUNGER ELEMENT OPERABLE INDEPENDENTLY OF SAID FIRST PLUNGER ELEMENT FOR ENABLING FILLING SAID TUBULAR STRUCTURE BORE PORTION WITH LIQUID, SAID SECOND PLUNGER ELEMENT BEING ALSO OPERABLE INDEPENDENTLY OF SAID FIRST PLUNGER ELEMENT FOR DISCHARGING LIQUID THROUGH AND FROM SAID TUBULAR STRUCTURE BORE PORTIO NTO THEREBY REMOVE FROM SAID TUBULAR STRUCTURE BORE PORTION ANY LIQUID WHICH MAY CONTAIN BUBBLES SO THAT WHEN SAID FIRST PLUNGER ELEMENT IS SUBSEQUENTLY PROJECTED INTO SAID NEEDLE BORE ONLY SUBSTANTIALLY BUBBLE FREE LIQUID WILL BE EJECTED THEREFROM.