Combined syringe and needle shield

A safety syringe including:

• a syringe assembly having an elongate and generally cylindrical barrel member with distal and proximal end portions thereon and a collar member mounted on said distal end portion of said barrel member;
• a shield assembly including an elongate and generally cylindrical shield member having distal and proximal end portions thereon and an end cap mounted on said distal end portion of said shield member and said shield assembly being movable over said syringe assembly between extended and retracted positions such that said end cap is generally adjacent said syringe assembly in said retracted position of said syringe assembly and spaced apart from said syringe assembly in said extended position;
• and
• a plurality of inwardly directed and longitudinally aligned keys on the interior surface of said shield member and said keys extending substantially along the length of said shield member between said distal and proximal end portions of said shield member to contact a portion of said syringe assembly as said shield assembly is moved between said retracted and extended positions.

A safety syringe including:

• a syringe assembly having an elongate and generally cylindrical barrel member with distal and proximal end portions thereon and a collar member mounted on said distal end portion of said barrel member, said collar member having a diameter through at least a portion thereof which is greater than the diameter of said distal end portion of said barrel member;
• a shield assembly including an elongate and generally cylindrical shield member having distal and proximal end portions thereon and an end cap mounted about said distal end portion of said shield member, said shield assembly being movable between extended and retracted positions about said syringe assembly such that said end cap of said shield member is generally adjacent said distal end portion of said barrel member in said retracted position and is spaced apart from said distal end portion of said barrel member in said extended position;
• and
• said end cap including an end wall and side wall wherein said side wall interlockingly engages said distal end portion of said shield member to mount said end cap thereon and said end wall includes an aperture therein which is sized to form a reduced diameter opening at said distal end portion of said shield member.

A safety syringe comprising:

• a syringe assembly having an elongate and generally cylindrical barrel member with distal and proximal end portions thereon and a collar member mounted on said distal end portion of said barrel member;
• a shield assembly including an elongate and generally cylindrical shield member having distal and proximal end portions thereon and a separate end cap mounted on said distal end portion of said shield member, said shield assembly being movable between retracted and extended positions wherein said end cap of said shield member is generally adjacent said distal end portion of said barrel member in said retracted position and said proximal end portion of said shield member is generally adjacent said distal end portion of said barrel member in said extended position;
• and
• said end cap including a side wall and an end wall thereon, said side wall being sized to interlockingly engage at least a portion of said distal end portion of said shield member and said end wall of said end cap including a reduced diameter aperture therein to at least partially close said distal end portion of said shield member.