A medical device selectively attachable to a syringe having a barrel with a front end and a back end, a plunger slidably disposed inside the barrel, a fluid chamber disposed forwardly of the plunger, and a plunger handle projecting rearwardly from an opening in the back end of the barrel, the medical device comprising: a hub assembly comprising a hub which is disposable forwardly of the plunger, a retraction tube laterally spaced apart from the hub, and a frame member interconnecting the hub and the retraction tube in fixed, laterally spaced-apart relation to each other; a nose projecting forwardly from the hub; a rearwardly biased needle retraction mechanism (95, 50) seated inside the nose; a retractable needle projecting forwardly of the nose; a fluid flow path from the fluid chamber through the hub, nose, needle retraction mechanism (95, 50) and needle; characterized in that the nose is connected in rotatable relation to the frame member, the medical device is configured in that the nose and the hub assembly are manually rotatable with respect to each other by a user through an arc from a first position wherein hub and the barrel are coaxially aligned with the needle and the needle retraction mechanism (95, 50) to a second position wherein the retraction tube is coaxially aligned with the needle and needle retraction mechanism (95, 50) to allow the needle retraction mechanism (95, 50) to force the needle rearwardly into the retraction tube so that the needle no longer projects forwardly of the nose. selectively attachable to a syringe having a barrel with a front end and a back end, a plunger slidably disposed inside the barrel, a fluid chamber disposed forwardly of the plunger, and a plunger handle projecting rearwardly from an opening in the back end of the barrel, the medical device comprising: a hub assembly comprising a hub which is disposable forwardly of the plunger, a retraction tube laterally spaced apart from the hub, and a frame member interconnecting the hub and the retraction tube in fixed, laterally spaced-apart relation to each other; a nose projecting forwardly from the hub; a rearwardly biased needle retraction mechanism (95, 50) seated inside the nose; a retractable needle projecting forwardly of the nose; a fluid flow path from the fluid chamber through the hub, nose, needle retraction mechanism (95, 50) and needle; characterized in that the nose is connected in rotatable relation to the frame member, the medical device is configured in that the nose and the hub assembly are manually rotatable with respect to each other by a user through an arc from a first position wherein hub and the barrel are coaxially aligned with the needle and the needle retraction mechanism (95, 50) to a second position wherein the retraction tube is coaxially aligned with the needle and needle retraction mechanism (95, 50) to allow the needle retraction mechanism (95, 50) to force the needle rearwardly into the retraction tube so that the needle no longer projects forwardly of the nose. a hub assembly comprising a hub which is disposable forwardly of the plunger, a retraction tube laterally spaced apart from the hub, and a frame member interconnecting the hub and the retraction tube in fixed, laterally spaced-apart relation to each other; a hub which is disposable forwardly of the plunger, a retraction tube laterally spaced apart from the hub, and a frame member interconnecting the hub and the retraction tube in fixed, laterally spaced-apart relation to each other; a nose projecting forwardly from the hub; a rearwardly biased needle retraction mechanism (95, 50) seated inside the nose; a retractable needle projecting forwardly of the nose; a fluid flow path from the fluid chamber through the hub, nose, needle retraction mechanism (95, 50) and needle; characterized in that the nose is connected in rotatable relation to the frame member, the medical device is configured in that the nose and the hub assembly are manually rotatable with respect to each other by a user through an arc from a first position wherein hub and the barrel are coaxially aligned with the needle and the needle retraction mechanism (95, 50) to a second position wherein the retraction tube is coaxially aligned with the needle and needle retraction mechanism (95, 50) to allow the needle retraction mechanism (95, 50) to force the needle rearwardly into the retraction tube so that the needle no longer projects forwardly of the nose.