Dental Syringe

A self-shielding aspirating dental syringe manufacturers includes a body having proximal

and distal ends and a cavity therein for receiving a medicine cartridge. The distal end has a double-ended needle attached thereto, and the proximal end has a opening for inserting the cartridge into the cavity, and to which a plunger assembly may be attached. A shield is slidable on the body between retracted and extended positions for uncovering and covering the needle, respectively. Cooperating detents and detent pockets are molded on the shield and body for securing the shield in the extended position. A lever is molded on the shield that is pivotable for directing the detents radially outwardly to disengage the detents from the distal detent pockets and allow retraction of the shield from the extended position. A latch is molded on the shield for locking the lever and preventing subsequent retraction of the shield from the extended position.

The syringe manufacturers manufacturers of claim 1, wherein the shield comprises a deflectable portion that is deflectable radially outwardly for disengaging the detent from the detent pocket to allow retraction of the shield.

The syringe manufacturers manufacturers of claim 2, wherein the deflectable portion comprises a lever on the shield having one of the detent and detent pocket on a first end thereof, the lever being pivotable for directing the one of the detent and detent pocket radially outwardly to disengage the detent from the detent pocket.

A self-shielding dental syringe manufacturers, comprising:

a body having proximal and distal ends and a cavity therein for receiving a medical cartridge;

a needle cannula on the distal end of the body having a proximal portion extending proximally into the cavity, and a distal portion extending distally beyond the distal end of the body;

a plunger assembly substantially permanently attached to the proximal end of the body for distally directing a piston in a cartridge received in the cavity to deliver medication from the cartridge through the needle;

a shield slidably attached to the body;

cooperating detents and detent pockets on the body and shield to temporarily hold the shield in a etracted position wherein the distal portion of the needle is exposed, to temporarily hold the shield in an intermediate guarded position wherein the distal portion of the needle is substantially covered, and to substantially permanently lock the shield in a fully extended position distally beyond the intermediate position.

by: ericfu

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