| 摘要 |
A suction actuated valve, for a dry powder inhaler, comprising: a compressed air lumen; a control chamber for providing suction; and a trigger assembly, in fluid communication with the control chamber, comprising: a displaceable membrane contained within the control chamber and displaceable within the control chamber, the displaceable membrane configured to seal the control chamber such that suction provided by the control chamber displaces at least a portion of the displaceable membrane to provide an opening force to the trigger assembly for moving the trigger assembly from a closed configuration to an open configuration; and a trigger coupled to the displaceable membrane, the trigger configured, in the closed configuration, to occlude the compressed air lumen and configured, in the open configuration, to open the compressed air lumen; wherein the trigger has a first cross-sectional area and the displaceable membrane has a second cross-sectional area greater than the first cross- sectional area such that when suction is provided by the control chamber the displaceable membrane provides a mechanical advantage for moving the trigger from the closed configuration to the open configuration. |
