Injection Device Toothed Gearing for Controlled Actuation

The patent implements a disposable injection device where the entire control arrangement including the toothed gearing is designed as a single-use plastic component. This eliminates the need for complex, expensive reusable mechanical systems while maintaining precise control during the injection process. The disposable nature allows for simplified design without compromising safety or precision.

The patent replaces complex mechanical control systems with a simplified toothed gearing mechanism that provides precise control through purely mechanical means. The gearing system translates linear actuation element movement into controlled rotational motion of the syringe plunger, eliminating the need for electronic sensors, motors, or complex feedback mechanisms.

The patent combines multiple safety and control functions into a single integrated toothed gearing mechanism. The same gearing that provides precise injection control also ensures the needle remains covered during disposal, and the blocking mechanism prevents accidental activation. This integration maintains reliability while keeping the device simple and cost-effective for disposable use.

The toothed gearing system is designed to automatically perform multiple functions: it controls the injection stroke, maintains dwell time by preventing backward motion, and ensures needle retraction. The mechanism serves itself by using the user's simple linear actuation to automatically execute the complex sequence of injection steps without requiring additional controls or monitoring.