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Breathing circuit
| Details |
Inventors: Suzuki, Tatsuo;
Assignee: Terumo Corporation (Tokyo, JP)
Primary Examiner: Recla; Henry J.
Assistant Examiner:
Attorney, Agent or Firm: Frishauf, Holtz, Goodman and Woodward
A breathing circuit which comprises a coaxial tube type main tube comprising an inner flexible tube constituting an inhalant circuit and a corrugated outer tube having a larger average wall thickness than said inner tube, encircling the periphery of said inner tube, and defining an exhalant circuit in conjunction with said inner tube; and an inner tube retaining member disposed at least at one end of said coaxial tube type main tube and serving to keep said inner tube and said outer tube at a prescribed distance from each other. |
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DETAILED DESCRIPTION What is claimed is: 1.
A breathing circuit which comprises: coupling means adapted to be coupled to a patient and through which the patient can inhale and exhale; a source of supply fluid for the patient; a coaxial tube type main tube coupled between said coupling means and said supply source, and comprising an inner flexible tube constituting an inhalant circuit and a corrugated outer tube having a larger average wall thickness than said inner tube, said outer tube encircling the periphery of said inner tube and defining an exhalant circuit in conjunction with said inner tube; and an inner tube retaining member disposed at least at one end of said coaxial tube type main tube for keeping said inner tube and said outer tube at a prescribed distance from each other; the average wall thickness of said inner tube being 20 to 60% of the average wall thickness of said outer tube.
2.
A breathing circuit according to claim 1, wherein the flexible inner tube of the coaxial tube type main tube is a corrugated tube.
3.
A breathing circuit according to claim 2, wherein the division of the ratio of elongation of the inner tube by that of the outer tube gives a quotient of not more than 0.
8.
4.
A breathing circuit according to claim 2, wherein said corrugated outer tube and said corrugated flexible inner tube have alternate ridges and grooves; and the difference between the outside diameter at the ridges and that at the grooves in the corrugated inner tube is smaller than the difference between the outside diameter at the ridges and that at the grooves in the corrugated outer tube.
5.
A breathing circuit according to claim 4, wherein the difference between the outside diameter at the ridges and that at the grooves in the inner tube, when divided by the difference between the outside diameter at the ridges and that at the grooves in the outer tube, gives a quotient falling in the range of 0.
20 to 0.
95.
6.
A breathing circuit according to claim 4, wherein the difference between the outside diameter at the ridges and that at the grooves in the inner tube, when divided by the difference between the outside diameter at the ridges and that at the grooves in the outer tube, gives a quotient falling in the range of 0
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