High frequency chest wall oscillation apparatus

An air pulse generator for use with an inflatable garment, the air pulse generator comprising:

• an air chamber shell defining an air chamber, the air chamber shell having an air port in communication with the air chamber and the inflatable garment, the air chamber shell having a blower inlet spaced from the air port and in communication with the air chamber,
• a blower in communication with the blower inlet to pressurize and maintain the air chamber above atmospheric pressure;
• and
• first and second diaphragms which move toward and away from each other in a cyclical manner to produce oscillating pressure within the air chamber, said air chamber is located between the first and second diaphragms, the blower inlet being located between the first and second diaphragms and in communication with the air chamber located between the first and second diaphragms, wherein the first and second diaphragms move generally along an axis toward and away from each other, and the blower is coupled to the air chamber shell such that the axis passes through the blower.