| 摘要 |
In the present invention, personal air filtration unit sold as SMARTMOUTH(TM), a trademark for a personal air filtration unit comprised of an outer activated carbon pre-filter and an inner filter for particulate matter available through Tri-Pact Enterprises has been attached to a column of valve connectors which are connected to a tracheostomy tube. The filter has a downwardly dependent exhaust port which allows expired air to flow out of the filtration unit without passing through the filters, thereby helping to prevent mixing of inhaled and exhaled air, and decreasing resistance to exhalation, as well as one-way valves in the form of a flap, on the one hand to prevent exhaled air from entering a dead space between filters, and on the other hand to prevent entering of inhaled air through the exhaust port.
|
