Patent ID: 8114050

Claim:
A plunger for a retractable syringe having a barrel and a retractable needle mount to which is mounted or is mountable to a needle, said plunger comprising: a plunger member including an engagement apparatus configured to engage with the retractable needle mount; a plunger housing; a spring positioned inside the plunger housing, but outside the plunger member such that the plunger housing and the plunger member cooperate to maintain the spring in an initially compressed state prior to a retraction of the retractable needle mount; and a retractable removable control device configured to facilitate control of a rate of retraction of the retractable needle mount when engaged with the plunger member and the needle is being retracted, wherein the removable control device has a first end configured with a nub to engage a ring of the plunger member, and a second end configured to allow manual control over the rate of retraction of the retractable needle mount.