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Equipment - Respiratory Care questions with answers.
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Equipment - Respiratory Care questionswith answers.
oxygen conserving device (OCD) ANS -a type of regulator that senses inspiration, only delivering O2
during the inspiratory phase. The device may be electronic or pneumatic in its operation. Can easily
double the duration of a compressed gas cylinder.
oxygen concentrator ANS -a device that seperates O2 from RA (room air) for delivery of O2 - rich gas to
the pt (patient). most concentrators operate using molecular sieves, which adsorbs the nitrogen from
the air & pass the O2.
membrane enricher ANS -a type of home O2 therapy device that utilizes a semipermeable membrane to
seperate the nitrogen from the O2 in RA (room air)
molecular sieve concentrator ANS -an O2 concentrator that is a home O2 therapy device that separates
nitrogen from room air and passes O2. It works by means of adsorption using a sieve bed composed of
Zeolite
mercury barometer ANS -a device used to measure air pressure that employs a column of mercury
inverted into a mercury reservoir. Gas pressure against the surface of the reservoir causes the mercury
column to rise or fall.
mechanical manometer ANS -similar in consruction to an aneroid barometer. a diaphragm or evacuated
container is exposed to the area where pressure measurements is desired. Gas pressure against the
dighram of chamber causes a needle to move thru a gear set, much like a mechanicla watch that records
the pressure.
laminar gas flow ANS -smooth uniform gas flow in one direction. flow occurs @ velocities such that the
Reynolds # is less than 2,000.
kinetic theory ANS -theory that describes the behavior of an ideal gas. The theory states that 1-
molecules are in random motion, 2-any molecular collisions are completely elastic in nature (energy is
not lost, only transferred), 3-as temperature rises activity also rises, and , 4-there is no physical attracton
between gas molecules.
, Poiseuilles's Law ANS -the relationship between volumetric flow,viscosity pressre, length and velocity of
gas flowing thru a tube. Only applies for laminar flow. One important relationship is that as the radius of
a tube is decreased by 1/2 the resistance to gas, flow increased by 16 times.
Pressure ANS -measure of force divided by surface area
zone valves ANS -a safety valve that is placed in an O2 piping system such that gas flowmay be shut off
in the event of a fire or other emergency
viscious shearing ANS -a phenomenon by which gas or a liquid may be entrained into a high velocity gas
stream by shear forces and vortices or eddies;
Venturi mask ANS -a type of air entrainment mask that has been misnamed. This mask works using the
principles of viscious shearing and vorticity and is also referred to as a HIGH AIR FLOW w/O2
ENRICHMENT (HAFOE) device;
turbulent gas flow ANS -an erratic and irregular flow; having multiple vectors of direction; this type of
flow requires more energy to sustain;
Torr ANS -a unit of presssure named for Evangelista Torricelli, the inventor of the barometer. The units
in the SI systemm are mmHg;
Thorpe tube flowmeter ANS -a type of flowmeter that incorporates a tapered tube and a float to
measure gas flow; may be uncompensated or compensated for back pressure; compensation is
determined by the placement of the needle valve in relationship to the __ ___;
Reynolds number ANS -equation is ued to predict whether gas flow will be laminar or turbulent; the
calculation accounts for the gas' velocity, viscosity, density and the diameter of the tube; if the # is less
than 2000, flow will be laminar;
regulator ANS -is a combination of a reducing valve and a flowmeter into one device; it may employ
Bourdon flowmeters or Thropre tube flow meters, depending on their design;
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