Shielded safety syringe

A shielded safety syringe comprising an inner cylinder having proximal and distal ends and a hypodermic needle supported by and extending outwardly from said distal end, said syringe further comprising:

• an outer sleeve having proximal and distal ends and being coaxially aligned with and movable axially relative to said inner cylinder from a retracted position, where said needle projects past the distal end of said outer sleeve, to a distally advanced position, where said needle is located within and completely surrounded by said outer sleeve;
• first and second locking means being axially spaced from one another and projecting from one of said inner cylinder or said outer sleeve;
• and
• third locking means projecting from the other of said inner cylinder or said outer sleeve;
• the continuous axial movement of said outer sleeve from the retracted position to the distally advanced position causing said third locking means to be received in the space between said first and second locking means to thereby lock said outer sleeve at the distally advanced position with said needle shielded by said outer sleeve.

A shielded safety syringe comprising an inner cylinder having proximal and distal ends and a hypodermic needle supported by and extending outwardly from said distal end, said syringe further comprising:

• an outer sleeve coaxially aligned with and movable axially relative to said inner cylinder from a retracted position, where said needle projects past said outer sleeve, to a distally advanced position, where said needle is located within and completely surrounded by said outer sleeve;
• first and second locking means being axially spaced from one another and extending around the periphery of one of said inner cylinder or said outer sleeve in parallel alignment with each other;
• and
• third locking means projecting from the other of said inner cylinder or said outer sleeve;
• the continuous axial movement of said outer sleeve from the retracted position to the distally advanced position causing said third locking means to be received in the space between said first and second locking means to thereby lock said outer sleeve at the distally advanced position with said needle shielded by said outer sleeve.