Both the tube and the matched guidewire are *kink-resistant*.

There is an extended section without reinforcement at the lower end of the tube making it highly flexible.*

A bench was created to test the resistance to sliding between the various combinations of the prototypes. The video shows the performance of a bougie and a guidewire through the same tube configured in an angle of difficult airway

Sliding resistance is negligible even when a tube 'tied in a knot' (to present extreme angulations) is moved to and fro over the guidewire (or vice versa- not presented here).

A dedicated ‘guide-channel’ built inside the wall of the tube for the railroading, frees up the unoccupied central lumen of the tube to serve delivery of oxygen and/ or visual confirmation of the progress or position of the tube inside the airway using a flexible viewing scope/camera.

It was tested in human cadavers. The video shows the progress of the tube through the upper airway into the trachea.

Greater inward deformation (‘giving in’) of the non-reinforced section of the tip of the tube at the narrower section of the larynx in a cadaver, as watched from the trachea, looking up.

Progress of the Naga tube in the live human subject.