| 摘要 |
A nasal cannula comprising a generally tubular insert element which has a distal portion (4) to be placed in a nasal cavity and a proximal portion (2) for connection to a supply line (10) for oxygen or oxygen-enriched gas is characterised in by the distal portion (4) being formed of a flexible and resilient material and having a divergent, generally frusto-conical, configuration. The cannula provides a positive and comfortable fit in the nasal cavity, making it efficient in administering supplied gas and facilitating control over inspired oxygen concentration. It is conveniently used with the high-humidity, high-flowrate oxygen-enriched air supplied by oxygen concentrators employing gas-separation membranes. |
