Tamper evident needle guard for syringes

A needle guard for a medical cartridge, comprising:

• a body having a proximal end, a distal end, and a cavity configured for receiving a medical cartridge having a cartridge barrel and a plunger, the plunger comprising a plunger shaft slidable within the medical cartridge, wherein the medical cartridge is a syringe having a needle extending from the cartridge barrel,
• a shield configured to be slidably attached to the body between a retracted position for exposing the needle, and an extended position to substantially cover the needle;
• and
• a plunger locking mechanism attachable to the proximal end of the body, the plunger locking mechanism including an aperture formed on an edge of a flange that, when the medical cartridge is received within the cavity of the body, is configured to allow the plunger shaft to slide within the aperture, while preventing the plunger from being removed from the cartridge barrel;
• wherein the plunger locking mechanism is attached to the proximal end of the body by mating at least one pair of opposing tab slots disposed on the proximal end of the body with at least one pair of opposing tabs disposed on the plunger locking mechanism.

A needle guard for syringes, comprising:

• a body having a proximal end, a distal end, and a cavity configured for receiving a medical cartridge having a cartridge barrel and a plunger, the plunger comprising a plunger shaft slidable within the medical cartridge, a thumb pad on a proximal end of the shaft, a plunger flange on a distal end of the shaft, a tip extending from the plunger flange, and a piston coupled to the tip;
• and
• a plunger locking mechanism attachable to the proximal end of the body, the plunger locking mechanism including a member with an aperture that, when the medical cartridge is received within the cavity of the body, is configured to allow the plunger shaft to slide within the aperture, wherein the plunger flange being larger than the aperture and abutting the member thereby preventing the plunger from being removed from the cartridge barrel;
• wherein the member is mountable to the proximal end of the body by mating at least one pair of opposing tab slots disposed on the proximal end of the body with at least one pair of opposing tabs disposed on the flange.

A needle guard for a medical cartridge, comprising:

• a body having a proximal end, a distal end, and a cavity in which a cartridge barrel of a medical cartridge is disposed, the medical cartridge having a plunger, the plunger comprising a plunger shaft slidable within the cartridge barrel;
• wherein the proximal end of the body comprises a finger grip, wherein the finger grip comprises opposing lateral surfaces defining a recess;
• and
• a plunger locking mechanism attached to the proximal end of the body, wherein the plunger locking mechanism is received in the recess and attached to the finger grip, the plunger locking mechanism including an aperture formed on an edge of a flange to allow the plunger shaft to slide therein, the aperture configured so that the edge prevents the plunger from being removed from the cartridge barrel.

A needle guard for a syringe, comprising:

• a body having a proximal end, a distal end, and a cavity being adapted to receive a medical cartridge having a cartridge barrel and a plunger, the plunger comprising a plunger shaft slidable within the medical cartridge, wherein the medical cartridge is a syringe that comprises a needle extending from the cartridge barrel, and further comprising a shield configured to be slidably attached to the body between a retracted position for exposing the needle, and an extended position for substantially covering the needle;
• and
• a plunger locking mechanism attached to the proximal end of the body, the plunger locking mechanism including a flange with an aperture to slidably receive the plunger shaft, the flange with the aperture being configured for preventing the plunger from being removed from the cartridge barrel;
• wherein the plunger locking mechanism is attached to the proximal end of the body by mating at least one pair of opposing tab slots disposed on the proximal end of the body with at least one pair of opposing tabs disposed on the plunger locking mechanism.