Filteration & Aerosol Therapy

Filteration & Aerosol Therapy - DM SEMINAR Dr Ajmal...

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DM – SEMINAR r Ajmal Khan Dr. Ajmal Khan Filtration & Aerosol Therapy in ICU
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Filtration in ICU
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Filtration ± In 1942, Langmuir & coworkers ± Penetration of particles through filter material depends on the size of the particles ± Highest degree of penetration occurs with particles pproximately 0 3 μm in diameter approximately 0.3 μm in diameter ± Masks used to prevent inhalation of particles should be tested using this particle size
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Filtration ± Two types of filters ± Respirator ttaches tightly to the face & covers mouth & nose ± Attaches tightly to the face & covers mouth & nose ± Categorized as N95, N99, or N100 based on NIOSH rating system ± Prevent at least 95%, 97% or 99.97% of particles of the most penetrating particle size (MPPS) from passing through
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Filtration ± Breathing system filter ± Stops spread of infectious material at the source so that e environment is not contaminated the environment is not contaminated ± Applied most commonly for filtration of gases exhaled by patients on anesthesia machines and critical care entilators ventilators
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Filtration Inertial impaction Interception rownian motion Brownian motion ravitational Mechanisms of particle capture by lter Gravitational velocity Electrostatic filter deposition
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Filtration ± Inertial impaction ± Particle cannot follow abrupt change in direction article continues in relatively straight path and impacts ± Particle continues in relatively straight path and impacts with the filter fibers ± Higher face velocities or larger particle mass increases article capture particle capture
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Filtration ± Interception ± Particles with low inertia tends to follow gas streamline ± Captured due to its diameter that makes contact while passing the filter fiber ariables contributing to interception are ± Variables contributing to interception are ± Particle diameter ± Filter fiber diameter ± Density of the filter fibers
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Filtration ± Brownian motion ± Random chaotic motion of very small particles auses particle to deviate from carrier gas streamline ± Causes particle to deviate from carrier gas streamline ± Increases probability of making contact with a filter fiber ± Predominant mechanical method of particle capture for mall particles (below 0 1 μm) small particles (below 0.1 μm)
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Filtration ± Gravitational velocity ± Deviation of particle from its gas streamline due to ravity gravity ± Little bearing on particle smaller than 5 μm ± Gravitational settling change - gas flow through the filter edium is vertical or horizontal medium is vertical or horizontal
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Filtration ± Electrostatic deposition ± Electrostatic attraction causes particle to deviate from gas streamline ± Most air-borne particulate material carries some lectrostatic charge electrostatic charge ± Most NIOSH certified respirators are enhanced with electrostatic properties
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AEROSOLS
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Definition ‘aero’ air ‘ ol’ solution sol Particles which are sufficiently small so as to remain airborne for a ‘considerable’ period of time uspension of solid or liquid particles in a gas Suspension of solid or liquid particles in a gas
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Filteration & Aerosol Therapy - DM SEMINAR Dr Ajmal...

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