Abstract: A safety syringe for preventing "needle stick" injury and/or reuse of the syringe includes a body (100), a plunger (127) mounted within the body, a protuberance (129) on the plunger for connecting the plunger to a needle holder (102) adapted in use to carry a needle at the end of an injection stroke of the plunger whereby subsequent retraction of the plunger withdraws the needle into a shielded position within the body. The syringe includes a braking device (123) disposed between the body (100) and the plunger (127) to retard but not stop the withdrawal of the plunger and needle after the injection stroke. The needle holder (102) includes a radially extending flange (108) which engages with a complementary rib (109) or groove on the syringe until the needle holder is engaged by the protuberance (129) on the plunger.

Abstract: A safety syringe for preventing "needle stick" injury and/or reuse of the syringe includes a body (2), a plunger (4) mounted within the body, connection means (24) for connecting the plunger (4) to a needle holder (6) whereby subsequent retraction of the plunger (4) withdraws the needle holder (6) and the needle with a shielded position within the body (2) effected by a vacuum chamber (18) defined between the plunger (4) and the syringe body (2), vacuum being created within the chamber (18) by movement of the plunger (4) during the injection stroke and serving to withdraw the plunger (4), the needle holder (6) and needle after injection pressure is removed. The syringe may be provided with braking means (20) to control the rate of withdrawal of the needle and/or to prevent withdrawal until the injection stroke of the plunger (4) has been completed.