Apparatus and method of providing high frequency variable pressure to a patient

What is this patent about?

’596 is related to the field of respiratory therapy and pulmonary hygiene, specifically focusing on devices that assist patients in clearing mucus and other secretions from their airways. Many patients with weakened respiratory systems lack the expiratory force required to cough effectively, leading to dangerous fluid buildup. While existing solutions like manual flutter valves or large mechanical blowers exist, they are often position-sensitive, bulky, or entirely dependent on the patient’s own breathing strength to function.

The underlying idea behind ’596 is to decouple the generation of airway pressure oscillations from the patient's physical effort by using an electromechanically actuated valve. By employing an independent power source and control circuit to drive a valve between open and restricted states, the device creates high-frequency pressure spikes that loosen secretions regardless of how weakly the patient breathes. This shift from a passive, flow-dependent mechanism to an active, motorized oscillation allows for consistent therapy across a wide range of patient capabilities and device orientations.

The claims of ’596 focus on a patient circuit defining a closed path between a gas source and the airway, featuring a valve assembly that transitions between a substantially unobstructed flow state and a flow-restricted state. Central to the claimed invention is an actuating system—such as a solenoid-style electromagnetic coil or a rotary motor—that drives these transitions at a predetermined frequency. The claims emphasize that this oscillation occurs independently of the patient's inspiratory or expiratory effort, ensuring the therapeutic pressure spikes are maintained at a controlled rate.

In practice, the invention can be implemented using a reciprocating sleeve valve driven by a voice coil and permanent magnet, or a rotary valve spun by a variable-speed motor. As the valve cycles, it rapidly interrupts the air stream, creating mechanical vibrations within the lungs that thin and mobilize mucus. The device further integrates a control interface allowing clinicians or users to tune the oscillation frequency, typically between 1 and 25 Hz, to find the specific resonance that best clears the patient's unique bronchial obstructions.

This approach differs from prior art by eliminating the requirement for high expiratory flow rates, which previously excluded the most vulnerable patients from using portable clearance aids. Unlike gravity-dependent ball-check valves, the active valve timing ensures the device works in any physical position, including for bedridden patients. Furthermore, by incorporating integrated flow sensors, the device differentiates itself by doubling as a diagnostic spirometer, allowing for the simultaneous monitoring of pulmonary function and the delivery of secretion clearance therapy in a single handheld unit.