Tapered Cap Lumen for Consistent End Effector Extension

A cap with a tapered central portion is introduced as an intermediary component between the control wire and the end effector. The tapered geometry provides a mechanical interface that defines the distal-most position of the control wire relative to the cap, thereby consistently defining end effector extension regardless of tube configuration. This mediator translates the control wire's position into a predictable end effector position even when the tube is bent.

The cap's tapered central portion changes the geometric parameters of the lumen from a uniform cylinder to a tapered structure with a specific angle (e.g., 30 degrees). This parameter change creates a mechanical stop condition where the control wire contacts the tapered surface at a defined position, ensuring consistent end effector extension length independent of tube bending or tortuous path configuration.

The device is segmented into distinct functional components: a flexible tube for navigation, a cap with tapered lumen for position control, a control wire for actuation, and an end effector for treatment. This segmentation allows the tube to be flexible and adapt to tortuous paths while the cap and control wire mechanism maintains consistent extension control regardless of tube configuration.

The device incorporates dynamic elements including the flexible tube that can bend and conform to body lumens, and the movable end effector that can be extended and retracted via the control wire. The tapered cap provides a dynamic mechanical interface that maintains consistent geometric relationships even as the tube dynamically bends along tortuous paths to reach deep body sites.