Microneedle Patch Applicator With Spring-Driven Depth Control

The applicator device enables self-service application by the patient without requiring clinical personnel. The device includes a piston mechanism that automatically delivers the microneedle array when activated by the patient pressing a button, eliminating the need for manual clinical administration while maintaining consistent delivery performance

The patent replaces manual mechanical application with an automated piston-driven mechanical system. The piston is propelled by a spring mechanism that provides controlled force to penetrate the microneedles through the skin, substituting inconsistent manual pressure with a reliable mechanical force generation system

The patent introduces a piston as an intermediary mechanical element between the activation button and the microneedle array. This piston mediator translates the user's button press into controlled mechanical force, ensuring consistent penetration depth and API delivery while maintaining a relatively simple overall device structure

The spring mechanism is pre-compressed and stored in a ready state within the applicator device. When activated, the pre-stored spring energy is released to propel the piston forward with consistent force, ensuring reliable penetration depth control without requiring complex real-time adjustment mechanisms

The patent replaces inconsistent manual force application with a spring-driven piston mechanism that generates consistent mechanical force. The spring is pre-compressed to a specific degree, ensuring that each activation delivers the same force magnitude to the microneedle array, thereby achieving consistent API delivery amounts

The patent controls the spring compression parameter to a specific range (pre-compressed state) to ensure consistent force generation. By standardizing this physical parameter, the device achieves reproducible API delivery quantities across multiple applications while remaining easy to operate