Needle Hub Cam Actuation for Needle Retraction and Cannula Insertion

The needle and cannula insertion/retraction system operates automatically through spring mechanisms and cam tracks that engage with an activation button. The user simply presses the button to initiate the sequence, and the system self-regulates the insertion depth, locking, and retraction timing without requiring manual manipulation of multiple components.

The system employs dynamic mechanical elements including a cam track with varying radius that converts rotational motion into linear insertion/retraction motion, spring-loaded locking mechanisms that automatically engage and disengage, and a cannula spring that provides controlled retraction force. These dynamic elements enable automated operation while maintaining precise control.

The patent combines multiple functions into integrated components: the cam track simultaneously guides both needle and cannula insertion, the locking mechanism integrates with the hub body to secure both elements, and the activation button triggers a coordinated sequence for both needle and cannula movement. This merging reduces the number of separate actuators and control systems needed.

The automated system is divided into distinct functional modules: an insertion module with cam track and cam member, a locking module with cannula lock and lock spring, a retraction module with cannula spring, and an activation module with the button. Each module performs a specific function and can be independently analyzed, which manages overall complexity through functional decomposition.