M
Malcolm R. Williams
Researcher at Wilmington University
Publications - 14
Citations - 771
Malcolm R. Williams is an academic researcher from Wilmington University. The author has contributed to research in topics: Gas compressor & Rotor (electric). The author has an hindex of 7, co-authored 14 publications receiving 771 citations.
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Patent
Portable drag compressor powered mechanical ventilator
Douglas F. Devries,Michael J. Cegielski,Warner V. Graves,Malcolm R. Williams,Michael B. Holmes +4 more
TL;DR: In this article, a ventilator device and system comprising a rotating compressor, preferably a drag compressor, which, at the beginning of each inspiratory ventilation phase, is accelerated to a sufficient speed to deliver the desired inspiratory gas flow, and is subsequently stopped or decelerated to a basal flow level to permit the expiratory ventilation to occur.
Patent
Portable ventilator system
TL;DR: In this article, a portable ventilator uses a Roots-type blower as a compressor to reduce both the size and power consumption of the ventilators, and overcomes noise problems through the use of noise reducing pressure compensating orifices on the Roots blower housing and multiple baffling chambers.
Patent
Compressor control system for a portable ventilator
TL;DR: In this article, a method and apparatus for controlling a brushless DC motor over a wide range of angular speeds is presented Analog magnetic sensors provide continuous signal measurements related to the rotor angular position at a sample rate independent of rotor angular speed.
Patent
Exhalation valve with flow transducer
Michael J. Cegielski,Douglas F. Devries,Warner V. Graves,Michael B. Holmes,Malcolm R. Williams +4 more
TL;DR: An exhalation flow transducer through which a mammalian patient is permitted to exhale, comprising: a housing having a fluid flow path deflectable in the direction of fluid flow through said flow path to create a pressure differential upstream and downstream of said flapper within said flowpath; a first pressure port located upstream of the flapper, and a second pressure port positioned downstream of it; a data storage device storing specific flow/pressure calibration information representing the actual flow through the flow path for a given pressure differential between the first and second pressure ports; and means for computing the flow rate
Patent
Method and apparatus for attenuating compressor noise
TL;DR: In this article, the authors proposed a method and apparatus for reducing the noise generated by compressors, including Roots-type blowers, in a portable ventilator housing, by folding a gas flow path to fit into a limited space.