Impact resistant and tamper evident system for prefilled syringe

A syringe assembly comprising:

• a syringe body defining a chamber configured to receive a material;
• a plunger rod configured to move within the chamber to dispense the material;
• a barrel cover configured to receive the syringe body, the barrel cover extending from a proximal portion to a distal portion;
• a backstop configured to attach to the proximal portion of the barrel cover to prevent a portion of the plunger rod from passing through the backstop;
• a tamper evident assembly including:
• a collar configured to attach to the distal portion of the barrel cover, and
• a tamper evident cap attached to the collar by a frangible connection between the tamper evident cap and the collar;
• and
• an anti-rotation member on the barrel cover or the collar, the anti-rotation member configured to prevent rotation of the collar relative to the barrel cover during breakage of the frangible connection.

A method of assembling a syringe assembly for administering a material, the method comprising:

• attaching a tamper evident assembly to a distal portion of a barrel cover, the distal portion of the barrel cover comprising a first attachment feature, wherein the tamper evident assembly comprises a collar that comprises a second attachment feature that is configured to attach to the first attachment feature, and wherein the tamper evident assembly further comprises a tamper evident cap that is connected to the collar by a frangible connection between the tamper evident cap and the collar;
• inserting a pre-filled syringe into the barrel cover, the pre-filled syringe comprising a flange and a plunger rod;
• and
• attaching a backstop to a proximal end of the barrel cover and over the flange of the pre-filled syringe to prevent a portion of the plunger rod of the pre-filled syringe from moving proximally through the backstop.

A syringe assembly comprising:

• a syringe body having a chamber configured to receive a material;
• a plunger rod configured to move within the chamber to dispense the material;
• a barrel cover configured to receive the syringe body, the barrel cover extending from a proximal portion to a distal portion;
• a backstop configured to attach to the proximal portion of the barrel cover to prevent a portion of the plunger rod from moving proximally through the backstop;
• a tamper evident assembly including:
• a collar positioned at the distal portion of the barrel cover, and
• a tamper evident cap attached to the collar by a frangible connection between the tamper evident cap and the collar;
• and
• an anti-rotation member on the barrel cover or the collar, the anti-rotation member configured to prevent rotation of the collar relative to the barrel cover during breakage of the frangible connection.

A syringe assembly comprising:

• a syringe body having a chamber configured to receive a material;
• a plunger rod configured to move within the chamber to dispense the material;
• a barrel cover configured to receive the syringe body, the barrel cover extending from a proximal portion to a distal portion, the barrel cover comprises a flange at the proximal portion of the barrel cover;
• a backstop configured to attach to the proximal portion of the barrel cover to prevent a portion of the plunger rod from moving proximally through the backstop, the backstop having a slot configured to receive the flange of the barrel cover, the backstop and the flange forming a continuous outer surface with the flange received in the slot;
• and
• a tamper evident assembly including:
• a collar configured to attach to the distal portion of the barrel cover, and
• a tamper evident cap attached to the collar by a frangible connection between the tamper evident cap and the collar.