Tamper evident needle guard for syringes

摘要

A medicine injection device comprises a cartridge having a cartridge barrel and a plunger having a plunger shaft slidable within the cartridge barrel. The cartridge may have, e.g., a pre-filled medicine. The medicine injection device further comprises a body having a proximal end, a distal end, and a cavity in which the cartridge barrel is disposed. The proximal end of the body may optionally form a finger grip. The medicine injection device further comprises a plunger locking mechanism attached to the proximal end of the body. The plunger locking mechanism comprises a member with an aperture slidably engaged with the plunger shaft. The locking mechanism is configured for preventing the plunger from being removed from the cartridge barrel. For example, the plunger shaft may include a locking stop, e.g., a flange, that engages with the aperture in an interference arrangement.

主权项

1. 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; and a plunger locking mechanism attachable to the proximal end of the body for preventing access to the contents of a medical cartridge received in the body, the plunger locking mechanism including a flange with an aperture formed on an edge of the flange that, when a 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 proximally removed from a cartridge barrel of a medical cartridge, and that is configured to laterally receive the plunger shaft; 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.