Aspirating type hypodermic syringes

Claim 1

A HYPODERMIC SYRINGE COMPRISING A BODY OF ELASTICALLY FLEXIBLE MATERIAL DEFINING BOTH A CLOSED FLUID AMPOULE AND AN ADJACENT CLOSED ASPIRATING CHAMBER, SAID BODY INCLUDING A PARTITION OF ELASTICALLY FLEXIBLE MATERIAL CONSTITUTING A COMMON WALL OF SAID AMPOULE AND SAID ASPIRATING CHAMBER, SAID ASPIRATING CHAMBER HAVING A RELATIVELY RIGID WALL PORTION OPPOSITE SAID PARTITION; A HYPODERMIC NEEDLE HAVING A POINTED BUTT END DISPOSED IN SAID ASPIRATING CHAMBER AND DIRECTED TOWARD SAID PARTITION IN CLOSE PROXIMITY THERETO AND HAVING AN OPPOSITELY DIRECTED POINTED DISCHARGE END, AN INTERMEDIATE PORTION OF SAID NEEDLE PASSING THROUGH SAID RELATIVELY RIGID WALL PORTION OF SAID ASPIRATING CHAMBER OPPOSITE SAID PARTITION AND BEING SURROUNDED AND GRIPPED BY SAID RIGID WALL PORTION IN SEALED RELATIONSHIP THEREWITH; SAID ASPIRATING CHAMBER BETWEEN SAID COMMON WALL AND SAID RIGID WALL PORTION BEING OF BULBOUS CONFIGURATION AND ELASTICALLY FLEXIBLE SO THAT IT MAY BE MANUALLY COLLAPSED BY EXTERNAL PRESSURE TO REDUCE ITS VOLUME AND WILL RETURN TO ITS NORMAL CONFIGURATION WHEN SAID PRESSURE IS RELEASED, THEREBY CREATING A SUCTION IN SAID NEEDLE TO DRAW BLOOD INTO SAID ASPIRATING CHAMBER, SAID PARTITION PREVENTING SAID BLOOD FROM MIXING WITH FLUID IN SAID AMPOULE, AND THE MATERIAL OF SAID PORTION OF BULBOUS CONFIGURATION BEING TRANSLUCENT TO PERMIT VISUAL OBSERVATION OF BLOOD DRAWN INTO THE ASPIRATING CHAMBER.