Figure 2

Bicycle compressor. The bicycle design of the HPN is a stationary single bi-directional piston design. This prototype device was constructed from a commercially available bicycle frame. The frame was cut and re-welded to produce the device. The silver cylinder is a bi-directional piston attached to the frame and the gear. The white plastic pieces are the one-way valves configured in the manner indicated in Figure 1, and the yellow plastic piece is the flow regulator. The nebulizer mouthpiece and tubing is connected to the output of the flow regulator. The operator—who is someone other than the patient—sits in a chair and pedals the device by foot. The effort required is roughly equivalent to riding a bicycle at a rate of eight miles per hour.