Safety syringe
The present invention relates to a safety syringe ( 100 ) having a hollow barrel ( 1 ), plunger ( 2 ) and a detachable needle support ( 4 ), characterized in that the safety syringe ( 100 ) includes; a) a piston gasket ( 3 ) interference fit with the plunger head ( 7 ) of the plunger ( 2 ); b) a plurality of bone structures ( 6 ) provided at the barrel head ( 1 a ) of the hollow barrel ( 1 ) to temporarily engage and support the needle support ( 4 ); c) a plurality of slots ( 8 ) longitudinally disposed at one substantial distal end of the needle support ( 4 ); and d) stoppers ( 5 ) provided at the barrel head ( 1 a ); wherein a fluid is injected by a first stroke of the plunger ( 2 ) under normal load; and an additional load is applied to the plunger ( 2 ) to compress the piston gasket ( 3 ) so that the plunger head ( 7 ) of the plunger ( 2 ) travels further to break the bone structures ( 6 ) for subsequent retraction of the needle support ( 4 ) on a second stroke.
1. A safety syringe comprising a hollow barrel having a barrel head; a plunger having a plunger head; and a detachable needle support; characterized in that the safety syringe comprises:
(a) a piston gasket placed in an interference fit with the plunger head of the plunger;
(b) a plurality of bone structures within the barrel head, wherein the plurality of bone structures are attached between the barrel head of the hollow barrel and the detachable needle support inserted within the barrel head, such that the plurality of bone structures support and temporarily connect the detachable needle support to the barrel head;
(c) a plurality of slots longitudinally disposed at one substantially distal end of the detachable needle support; and
(d) stoppers on the barrel head engage with the plurality of slots and inhibit capable of inhibiting the detachable needle support from being advanced into the hollow barrel;
such that, when a fluid is injected by a first stroke of the plunger under normal load and an additional load is applied to the plunger one a second stroke to compress the piston gasket, the plunger head of the plunger advances out from the piston gasket to contact and break the plurality of bone structures thereby permanently disengaging the detachable needle support from the barrel head and making the detachable needle support incapable of reuse.
2. The safety syringe according to claim 1 , wherein the piston gasket has a body with circumference resilient ribs provided thereon and an aperture centrally sited through the body.
3. The safety syringe according to claim 2 , wherein the aperture holds the piston gasket in place by interference fit with the plunger head.
4. The safety syringe according to claim 1 , wherein the piston gasket is made from a synthetic rubber or other rubber compound.
5. The safety syringe according to claim 1 , wherein the plurality of slots on the detachable needle support are slidably engaged with the stoppers provided on the barrel head of the hollow barrel.
6. The safety syringe according to claim 1 , wherein the stoppers are provided to further support and ensure the detachable needle support is securely mounted to the barrel head and to block the detachable needle support from being further inserted into the hollow barrel.