Shielded safety syringe.

摘要

A disposable syringe (1, 130 or 160) having particular application to vacuum tube phlebotomy and comprising respective inner (2, 132 or 162) and outer (4 or 134) needle carrying and protective cylinders which are coaxially aligned and axially extensible relative to one another. The inner and outer cylinders may be locked in a retracted position, whereby a hypodermic needle (22 or 138) is accessible for drawing blood samples from the patient to an evacuated tube (52) at the inner cylinder. After the last blood sample has been taken, the inner and outer cylinders may be locked in an axially extended position, whereby the hypodermic needle is completely surrounded and shielded by the outer protective cylinder so as to permit the safe handling of the syringe while avoiding an accidental needle strike and the possible spread of a contagious disease.