The Lung Flute - An Acoustic Device for Airway Clearance

Introduction

It is a handheld device that uses sound waves to mobilize and clear secretions. It is tubular in shape with a plastic mouth piece at one end and a Mylar reed attached to it, that flutters during use.

Mechanism of Action

The Mylar reed has flairs on the other end that increases the air mass within the device. This provides acoustic impedance. When the device is being used, the Mylar reed will oscillate at a frequency that matches the resonance frequency of pulmonary secretions (16-25Hz). Thus, the viscosity of these secretions are reduced by mechanical vibrations resulting from the sound waves, allowing for easier expectoration. Additionally, these vibrations will also facilitate the action of the mucociliary escalator which

Method of Use

First, perform a deep inhalation. Then, place your lips around the mouthpiece. Exhale forcefully through the Lung Flute as if trying to blow out a candle. After that, remove the mouthpiece from your mouth and quickly inhale again. Now, put the mouthpiece back in your mouth, and blow gently through the Lung Flute.

Remove the mouthpiece again and wait 5 seconds, taking several normal breaths.

For best results, blow into the Lung Flute for up to 20 sets of two blows per set. (You may need to begin slowly and build up the number of repetitions over time.)

Approximately 5 minutes after the session has ended, mucus will have collected at the back of the throat and you may start to cough vigorously. You may notice thinned mucus collecting at the back of your throat for several hours after the session, which is normal. A drink of water will wash away the mucus and prevent minor throat irritation.

Indications

The Lung Flute is indicated for the following conditions:

• COPD
• Asthma
• Emphysema
• Chronic Bronchitis
• Bronchietctasis
• Cystic Fibrosis
• Primary Ciliary Dyskinesia
• Respiratory infections and Pneumonia
• Seasonal respiratory influenza
• Pulmonary rehabilitation and case management

Evidence

The Lung flute is equivalent to Acapella in therapeutic efficacy.