Emergency Ventilator

Emergency Ventilator: Pneumatic Breath Delivery System

Solution: An Ambu-Bag or other deformable 1000ml object which is controlled via a pneumatic air cylinder. The cylinder is controlled by two solenoid valves that apply pressure/vacuum from conventional compressors as needed to control delivered pressure and volume. Feed back is provided by pressure and flow sensors in the deformable bag.

Progress So far

A prototype was constructed and tested on a human sized mannequin. The system delivers required volume and pressure. It also allows for immediate manual backup in the event of component failure by removing the Ambu-bag, a widely used manual airway delivery device. The major moving components are taken from Intra-Aortic Balloon Pump technology (The PI, WJO) has had many years experience): Compressor/Pressure regulation, solenoid valves and a pneumatic air cylinder. These are really a minimal design and have been proven to last more than 25xE6 cycles. A microcontroller is used to operate the system.

Manufacturable Design

The proposed device will meet all of the rfp criterion. The current prototype meets many of those as it now is constructed. These include:

  • Readily manufacturable materials and parts

  • Accommodate standard hoses and fittings

  • Tidal volume of 50 to 1000 mL

  • Adjustable inspiratory to expiratory time ratio

  • Provides Positive End Expiratory Pressure (PEEP)

  • Able to use ambient air, or low pressure oxygen

  • Able to operate off generator power sources

  • The remaining requirements are easily added to the design

Team Members

Prof. Bill Ohley

University of RI

Dr. Greg Jay

RI Hospital / Brown University

Doug Stern

Fulcrum Product Development

Dr. Kunal Mankodiya

University of RI

Instructions (evolving) for Constructing a basic version of this system are at this link: