| 摘要 |
A dispensing apparatus comprises a cannula which is externally wrapped by a coaxial jacket so as the cannula can keep a plurality of angular positions with respect to the jacket, the cannula being provided with a first opening and the jacket being provided with a second opening, the second opening being arranged for cooperating with the first opening to define a breather passage through the jacket and through the cannula, the first opening and the second opening being shaped so as to define a longitudinal position for the breather passage, the longitudinal position depends on a relative angular position between the jacket and the cannula.
|
