| 摘要 |
Apparatus for the selective taking of desired body liquids without any air and with no contamination risk for the operator. The needle (4) is fixed to a syringe comprised of a cylinder (5) and a first piston (8) called ''piston'' in the text, the bottom of the cylinder (5) and of the piston (8) being nested either directly or via a pad (12) which is dissolvable when entering in contact with the liquid, and the piston is provided at its center (14) with a longitudinal hollow opening so that a second piston (2), called ''cannula'' in the text may easily slide therein. The cannula (2) penetrates also the needle (4) up to its extremity and the cannula (2) is movable either passively under the effect of the liquid pressure so that the cannula acts as a reference device to indicate that the needle (4) has just penetrated the liquid compartment searched for, or actively, manipulated by the operator. |
