Injection Device Key Trigger Mechanism

A key device is introduced as an intermediary element between the user and the injection mechanism. The key must be inserted into a receptacle to complete an electrical circuit or release a mechanical latch, thereby preventing direct accidental activation while maintaining intentional control. This mediator ensures that only deliberate actions with the key can trigger the injection.

The key insertion step is required before the injection can be triggered. This preliminary action of inserting the key into the receptacle establishes a preparatory condition that must be met before the main function (injection) can occur, thereby preventing accidental triggering during the pre-injection phase.

The key device serves as a simple intermediary component that can be retained in the receptacle through straightforward mechanisms such as friction fit, snap-fit, or simple mechanical latches. These retention mechanisms are designed to be as simple as possible while still preventing accidental removal or activation, thereby balancing security with minimal added complexity.

The retention mechanism is designed to automatically engage and hold the key in place without requiring additional active components or complex control systems. The key itself may have features that enable self-retention, such as a shape that creates friction fit or engages with simple spring-loaded detents in the receptacle.