Nasal/oral cannula system and manufacturing
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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Abstract
A nasal/oral cannula for collecting a flow of exhaled gases and its method of manufacture are disclosed. The cannula comprises an elongated tubular body having a first and a second end portion, a surface and an internal volume; a wall internally disposed within said tubular body, said wall defining a first subvolume of said internal volume in the lengthwise direction of the tubular body; and an inlet through said surface, for introducing exhaled gases into said first subvolume. The first end portion defines an exit port for exhaled gases from said subvolume, and said wall is arranged directly adjacent to said inlet.
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Citations
14 Claims
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1. A respiratory cannula for collecting a flow of exhaled gases, said cannula comprising:
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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, and wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A respiratory cannula system comprising:
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a 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, and wherein 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; a first nozzle adapted for the transport of exhaled gases from the cannula, a first end of the first nozzle configured in size and shape to mate with the first end of the cannula; and a sampling tube adapted for the transport of exhaled gases from the cannula to an analyzer, the sampling tube extending between a second end of the first nozzle and the analyzer. - View Dependent Claims (14)
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Specification