Nasal/oral cannula system and manufacturing

  • US 10,441,196 B2
  • Filed: 01/22/2016
  • Issued: 10/15/2019
  • Est. Priority Date: 01/23/2015
  • Status: Active Grant
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First Claim
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1. A respiratory cannula for collecting a flow of exhaled gases, said cannula comprising:

  • an elongated hollow tubular body extending between a first end portion and a second end portion, the tubular body defining an internal volume;

    a wall internally disposed within said tubular body, said wall defining a first subvolume of the internal volume in the lengthwise direction of the tubular body;

    first and second hollow nostril prongs extending from the tubular body, one of the first and second hollow prongs comprising an inlet in fluid communication with the first subvolume of the internal volume and configured for transporting gas exhaled from the nostril of the patient to the first subvolume;

    an aperture extending through said tubular body at a junction of the inlet and the internal volume;

    wherein said first end portion defines an exit port for the gas from said subvolume, andwherein said wall is arranged in immediate contact with the inlet so that no void volume for the flow of exhaled gases is created between the wall and the inlet.

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