Final answer:
The S.A.L.T., or Supraglottic Airway Laryngopharyngeal Tube, is the device that can be used as a mechanical airway adjunct similar to an oropharyngeal airway and as a blind endotracheal tube introducer when laryngoscopy is difficult.
Step-by-step explanation:
The device used as a simple mechanical airway adjunct in situations where laryngoscopy is difficult and can also serve as a blind endotracheal tube introducer is the S.A.L.T., which stands for Supraglottic Airway Laryngopharyngeal Tube. The S.A.L.T. is similar to an oropharyngeal airway and is designed for situations where visualization of the vocal cords through laryngoscopy is challenging. It acts by providing a channel through which an endotracheal tube can be blindly inserted into the trachea, improving airway management in emergency situations such as when airways are obstructed by foreign objects or in cases of injury.