Patent ID: 8636688

Claim:
A syringe for medical use, the syringe comprising: a barrel further comprising a forwardly extending, internally threaded cylindrical section; a plunger assembly slidably engaging an inside wall of the barrel; and a needle retraction assembly seated in a front portion of the barrel, the needle retraction assembly including a forwardly protecting retractable needle holder with a forwardly facing end configured to be selectively engageable with and attachable to a retractable needle connector and needle; wherein the barrel and retractable needle holder are also cooperatively configured to be selectively engageable with a frontal attachment selected from a luer hub with a non-retractable needle or a needleless valve assembly; and wherein the barrel further comprises a guard structure including a plurality of circumferentially spaced-apart elements having free distal ends protecting forwardly from the internally threaded cylindrical section and past any other part of the barrel or the needle retraction assembly.