Current version: Revision 1

The current prototype employs a dual rack-and-pinion mechanical design converting rotational motion of motors into translational motion for bag compression. The device is powered by 120V AC with a < 15W power draw. 

The device accommodates wall or tank-based oxygen through the low-pressure oxygen intake port that is a standard to the BVM.

Current available settings for the device are the following:

• Tidal Volume (TV): 300 - 650 mL (50 mL increments)
• Respiratory Rate (RR): 5 - 30 BPM (1 BPM increments)
• I:E Ratio: 1:2, 1:3, 1:4, 1:5

The user interface consists of an LCD screen that allows the user to set the operating parameters of the device and start compression in less than one minute. During operation, this display also informs the user of the current TV, RR, and I:E.  The user can adjust the settings during usage of the device without shutoff. An emergency shut off button allows for immediate cessation of compression.

Initial tests have shown that the ApolloBVM is capable of delivering physiologically relevant volumes of compression for 24 hours of operation. 

Revision 2 Goals

In our next prototype iteration we intend to tackle the following:

• Provide ability to control Flow during inspiration, but if fixed: able to deliver 60L/min
• Pressure Support—a breath triggers either a set pressure or volume of air; and maintains a continuous PEEP (Positive End Expiratory Pressure)

Total Cost of all parts <$300

The total cost of the parts to make the device is expected to be under $250. This number is a significant decrease from the cost of entry-level ventilators with a starting price of $5000. For a DIY device, this price is arrived at assuming that equipment related to assembly are readily available and does not need to be purchased. 

Components and Assembly

ApolloBVM is assembled from readily available, consumer off-the-shelf parts. The majority of components are intended for use as-is and easily ordered through online retailers or hardware stores. Other parts including casing and gears may be 3D printed or laser cut. Our design files include a Bill of Materials for each of the components, ordered, or fabricated. 

Size

The ApolloBVM device cradles and secures the BVM with a design that balances a small footprint with limited play during and between breath cycles. The current version INCLUDING an adult BVM would be approximately, 14” by 16” by 7”.

Weight

The goal is for the device to be placed next to the patient on a side table or using a portable bedside table. The device is light-weight so it can be portable. The device currently weighs less than 10lbs.

Time from beginning of setup to first compression cycle

The time from the machine being turned on to delivering the first breath is less than 1 minute.