Injection device

An automatic injection device comprising:

• a syringe having a needle;
• a barrel;
• a plunger;
• and
• driving means (e.g., a resilient member or spring) for driving the plunger into the barrel,
• wherein the injection device is arranged to perform an automatic injection cycle in use comprising the stages of advancing the needle of the syringe for insertion, and driving the plunger into the barrel for dispensing a liquid contained in the barrel,
• wherein the device is arranged such that during operation of the device, a driving force is transmitted from the driving means to the plunger during the dispensing stage,
• wherein the device is arranged such that the syringe is driven forward during the needle advancement stage and the plunger is driven into the barrel during the dispensing stage for dispensing a liquid contained in the barrel,
• wherein the device comprises a cap that is configured to cover the dispending end thereof, as well as a rigid needle shield that fits over and protects the needle prior to operation,
• wherein the cap is configured to pull the rigid needle shield away from the device when it is itself removed from the device to expose the dispensing end ready for the automatic injection cycle to be performed,
• wherein the cap comprises an annular end portion, as well as one or more arms that extend from the annular end portion into the device, the one or more arms each comprising teeth configured to latch onto and pull the rigid needle shield away from the device when the end cap is removed.

An automatic injection device comprising:

• a syringe having a needle;
• a barrel;
• a plunger;
• and
• driving means (e.g., a resilient member or spring) for driving the plunger into the barrel,
• wherein the injection device is arranged to perform an automatic injection cycle in use using a plurality of axially movable components, wherein the automatic injection cycle comprises the stages of advancing the needle of the syringe for insertion, and driving the plunger into the barrel for dispensing a liquid contained in the barrel,
• wherein the device is arranged such that during operation of the device, a driving force is transmitted from the driving means to the plunger during the dispensing stage,
• wherein the device is arranged such that the syringe is driven forward during the needle advancement stage and the plunger is driven into the barrel during the dispensing stage for dispensing a liquid contained in the barrel,
• wherein the device further comprises a static member that interacts with a rear end of the plunger to prevent relative movement between the static member and the plunger prior to operation of the automatic injection cycle.