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Jeffrey W. Hoffmeister

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Publications by Jeffrey W. Hoffmeister (bibliography)

1995

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Mountjoy, Daniel N., Burnsides, Dennis B., Payne, Ernest F., Hoffmeister, Jeffrey W. and Diesel, Donald A. (1995): Custom Oxygen Mask Development Using Rapid Prototyping Technologies. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. p. 961.

“Customization of oxygen masks is currently an artistic, labor intensive process that sometimes takes several months from start to finish. The Advanced Aircrew Oxygen Mask (AAOM) project is concerned with the use of rapid prototyping technologies in the development of custom oxygen masks modeled after the MBU-20/P, or COMBAT EDGE, mask. AAOM is managed by Armstrong Laboratory's Crew Technology Division at Brooks Air Force Base, Texas. It is theorized that by customizing the shape of the mask seal to match the face shape at the face-mask interface, leakage, slippage and comfort will improve at high oxygen pressure levels (with a peak of 60 mm Hg) associated with this positive pressure breathing system. State-of-the-art technologies, facial surface digitizing and stereolithography, have been utilized to customize masks for seven subjects. The Computerized Anthropometric Research and Design (CARD) Laboratory, part of the Armstrong Laboratory's Human Engineering Division at Wright-Patterson Air Force Base, Ohio, utilized a 3-D digitizer to collect high-resolution facial surface data on each subject. Subjects were also digitized wearing an off-the-shelf MBU-20/P mask. A CAD model of a MBU-20/P mask front was aligned with the mask the subject wore, and data points on the face lying behind the mask were extracted to create a mask seal that perfectly matched each subjects' face. This seal was then merged with the CAD model of the mask front and sent electronically to be built through stereolithography. The physical molds were then dipped in RTV silicone rubber to create the customized face piece. Mask fit (leakage, slippage and comfort) will be tested in the next phase of the project.”

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