The extension spring acts as a flexible joint which can return to its original position.

A living hinge provides a flexible joint made from plastic. It does not act like a spring. 

Quarter wheel feature with longer lever to allow for multi-finger placement to provide additional torque.

Quarter wheel feature with thumb lever to actuate distal end of stylet. 

Mimics thumb toggle design but lever is enlarged to provide more torque to the user for articulation. 

Redesign of CAM handle without CAM shaft, cylindrical shaft for articulation attachment.

Attempt at CAM design for a thumb to create simple "locking" mechanism when desired angle is acquired.

A wheel design intended to articulate the stylet by rotating the wheel.