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Artificial Lungs

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Submitted By mekalili
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HEPA filters in vacuum cleaners tend to use two quite different mechanisms to clean the airstream. First, there are one or more outer filters that work like sieves to stop the larger particles of dirt, dust, and hair. Inside those filters, there is a concertina of what looks like folded paper designed to trap the smaller particles. The paper is actually a mat of very dense glass fibers and, unlike the gauze, it doesn't simply filter out small dust particles like a sieve. Instead, it uses three different mechanisms to catch dust particles as they pass through in the moving airstream. At high air speeds, some particles are caught and trapped as they smash directly into the fibers, while others snag on the fibers as they try to brush by. At lower air speeds, dust particles tend to wander about more randomly through the filter (a process known as Brownian motion after its discoverer, Scottish botanist Robert Brown) and may stick to its fibers as they do so. Together, these three mechanisms allow HEPA filters to catch particles that are both larger and smaller than a certain target size.

The fibers in the HEPA filters trap dust and dirt particles in three ways. Some particles crash into filter fibers and are absorbed by impact. Some are caught as they flow along in the moving airstream, move too close to a fiber and are trapped by interception. At lower air speeds, some are trapped by diffusion (when randomly moving dust and air particles crash into one another and some are pushed into the filter fibers).

According to NIOSH (the US National Institute for Occupational Safety and Health), a HEPA filter can trap 99.97 percent of dust particles that are 0.3 microns [1] in diameter whilst stopping mold spores and even some bacteria and viruses.

Woodford, Chris. (2008) HEPA filters. Retrieved from http://www.explainthatstuff.com/hepafilters.html. [Accessed (Insert date here)]

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HEPA filters have a minimum efficiency of 99.97% on 0.30 micrometer size particles when tested at the rated capacity and are designed to operate at temperatures up to 260°C. AireCell HT HEPA filters have been manufactured from the highest quality of materials under strict quality control conditions, and are certified to ensure performance under the most critical of conditions for performance and leak-free operation. The AireCell HT HEPA filter is manufactured in 304 grade stainless steel and is constructed into a double turned flange arrangement. The glass fibre HEPA media is then formed into closely-spaced pleats held apart by corrugated aluminium separators to ensure uniform airflow throughout the media pack. The media is then potted into place with the use of high temperature (RTV) silicone sealant compound rated for continuous service up to 260°C. http://www.airepure.com.au/products/airecell-ht/ HEPA filters are made from a fabric of tangled, warped fibers composed of fibreglass. These fibers are in a random pattern, with strands bending and curving in all directions to form a confusing, twisty maze that the air must go through. As the particles pass through the filter, they are caught in this maze in four ways: impaction, sieving, interception and diffusion.
Some bump into threads and stick to them (a phenomenon called impaction). Like our water metaphor, some get stuck in gaps between two threads that are too small for them to pass through (called sieving). As some are pushed through by the air flow, some pass so close to a fiber that they can't follow the flow of air around it and move out of the way, so they hit the fiber and stick (interception). And, finally, some smaller particles are knocked about randomly by molecules in the air, eventually bumping into and sticking to a fiber (diffusion). http://www.cnet.com/au/news/appliance-science-hepa-filters-and-the-physics-of-fresh-air/ Most HEPA filters are composed of thin, densely-packed glass fibers arranged in a special way so that air molecules can pass through, but larger pollutant molecules are trapped within the fiberglass mat. Particles can be trapped in a number of ways. Some particles are directly intercepted by the glass fibers and adhere to the HEPA filter, remaining trapped until the filter is cleaned or replaced. Other particles become trapped when they come in partial contact with one of the fibers and are pressed against the fibers due to the constant air flow passing through the HEPA filter, while many of the remaining particles either become attached to already-trapped particles or are drawn to the fibers by movements of the air molecules within the HEPA filter itself. Because of the unique design of the fiberglass mat, HEPA filters can trap up to 99.97% of airborne particles measuring 0.3 microns or larger; this can make a significant difference in the quality of indoor air by eliminating many of the particles and pollutants that can trigger asthma or allergy attacks in susceptible individuals. http://www.cleanairplus.com/blog/how-hepa-air-purifiers-work.html http://www.plentyair.com/how-hepa-works/ http://info.bakerco.com/blog/bid/252645/How-HEPA-Filters-Work-in-Clean-Benches-and-Biosafety-Cabinets http://www.criticalcertification.com.au/i/WhatisaHEPAFilter

https://www.citethisforme.com/

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3082030/#R5 http://ukhealthcare.uky.edu/transplant/services/lung/ecmo/ http://www.webmd.com/lung/features/artificial-lung-closer-to-clinical-trial http://www.technologyreview.com/news/537911/new-device-could-be-a-safer-alternative-to-lung-ventilators/ http://www.mirm.pitt.edu/medicaldevices/pubs/2004_ebbe_lung_%20artificial_current%20research%20and%20future%20directions.pdf http://www.alung.com/news/2015/08/new-publications-show-promise-of-improved-artificial-lung-devices/ Dialysis http://www.consultant360.com/story/respiratory-dialysis-machine-helps-copd-patients-avoid-intubation http://www.alung.com/education/respiratory-dialysis/ http://www.alung.com/news/2012/03/respiratory-dialysis-could-replace-mechanical-ventilation/’ http://www.medgadget.com/2010/01/hemolung_a_respiratory_dialysis_device_to_start_clinical_trials.html

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