| 摘要 |
A device mouthpiece is provided wherein the mouthpiece comprises a cylindrical tube and a filter element, wherein the filter element comprises a frame and a filter medium secured to the frame; the frame defines an annular channel which receives therein an end portion of the cylindrical tube; the end portion of the cylindrical tube forms a friction fit within the annular channel; and wherein the filter element is secured to the cylindrical tube via the friction fit. |
