Medical apparatus and instruments, namely, medical devices for treatment of obstructive sleep apnea, namely, stents for treatment of obstructive sleep apnea; nasal cavity insertion stents used to keep the airway from narrowing; medical devices for use in the prevention of nasal airway obstruction, namely, transnasal dilators, transnasal catheters, and transnasal cannulas; medical devices for use in the prevention of nasal congestion, namely, transnasal catheters and transnasal cannulas; medical devices for use in the prevention of snoring, namely, transnasal catheters and transnasal cannulas