Adjustable Injection Depth Mechanism for Versatile Drug Delivery

The patent applies the dynamics principle by introducing an injection depth modifying element that can be positioned at different locations along the movable element's path. This element dynamically changes the injection depth based on its position, allowing the device to adapt to different user needs without requiring multiple fixed-depth devices. The modifying element can be attached at various positions to achieve different injection depths, making the device versatile while maintaining relatively simple structure.

The patent applies the self-service principle by designing the injection device to automatically perform the injection function once activated. The device itself manages the injection process, including depth control and drug delivery, without requiring continuous manual intervention. This allows users with reduced hand functions to operate the device easily by simply activating it, while the device handles the precise injection execution autonomously.

The patent applies the segmentation principle by separating the protective cover function from the injection mechanism. The protective cover is designed as a distinct component that can be independently managed during the syringe arrangement process. This segmentation allows the device to handle the covered syringe more easily, as the cover can be removed or managed separately without interfering with the core injection mechanism, thus maintaining safety while simplifying the arrangement process.