One embodiment of an air flow regulating device may include a first chamber, a first one-way valve, a second chamber, and a second one-way valve. The first chamber may include an intermediate member having a tapered opening, a first hollow adaptor may be coupled to a ventilation tube for receiving air, and a second hollow adaptor may be coupled to an endotracheal tube for delivering the air to a patient. The first one-way valve may be carried within an end portion of the intermediate member. The second chamber may enclose the first chamber for configuring a hollow space therebetween. The second one-way valve may be configured between the first chamber and the second chamber for regulating a flow of the air through the tapered opening toward the hollow space, and to vibrate the air upon emerging from tapered opening.