Nasal/oral cannula system and manufacturing

A method of manufacturing a respiratory cannula system for collecting exhaled gases, the method comprising:

• obtaining a mold, the mold comprising a first cavity for forming an elongated tubular body of a cannula and a second cavity for forming a first prong of the cannula;
• positioning first and second insert pins at least partially inside said first cavity such that ends of the first and second insert pins are spaced from one another inside said first cavity by a gap, said gap for forming an inner wall within an interior of the elongated tubular body;
• positioning a third insert pin at least partially inside said second cavity and said first cavity such that an end of the third insert pin contacts the first insert pin, thereby facilitating formation of an inlet hole through the elongated tubular body for collecting exhaled gases from the first prong, wherein the ends of the first and second insert pins are positioned within said first cavity such that said gap is arranged proximate said second cavity, thereby facilitating formation of said inner wall proximate said inlet hole;
• and
• inserting material into said first and second cavities of the mold around the first insert pin, the second insert pin, and the third insert pin to form said elongated tubular body, said first prong, said inner wall, and said inlet hole of said cannula.