Physical Principles of Mech. Vent
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Physical Principles of Mech. Vent
physical principles of mech. vent
uses interface that allows operator to set & adjust various parameters
controls ventilator function
internal control system
determines how the mechanical drive mechanism delivers the gas
power source for a ventilator can be either ... or ... or ...
electrical or pneumatic or both
... is what powers the drive mechanism to deliver the gas
electrical source can either be a ... or ...
wall outlet or battery
electricity is controlled by ...
name 5 things electrical power can operate
pistons, solenoids, motors, compressors, electromagnets
pneumatically power ventilators are powered exclusively by ...
50 PSI gas sources
what are the 2 types of pneumatically powered ventilators
pneumatic & fluidic
use special circuits which are the equivalent of electronic logic circuits
fluidic powered ventilators
in combined power source, pneumatic power is used to ... And electrical power is used to ...
provide energy to deliver the breath & control the functions of the machine
how air flow into the lungs is achieved depends on ...
the means of creating the pressure gradient between the machine & patients lungs
determines the functioning of the ventilator & can use either electronics, pneumatics, or fluidics as control mechanism
older non microprocessor controlled ventilators use ...
open loop control systems "unintelligent systems"
system is called unintelligent because ...
the ventilator can not change its operation for changes in conditions
a ... system is more intelligent
closed loop system
closed loop system monitors both ... volume & ... volume & can determine if leak has occurred
delivered volume & returned volume
closed loops system can also determine ...
how much to compensate so pt. receives 500 cc & sounds the alarm
allows operator to set desired parameters & alarms
control panel (user interface)
determines how the gas moves to the patient
with a ... a blended mixture of gas flows into the bellows
spring loaded bellows
the tighter the spring, the greater the ...
electrical motor is connected to a piston which moves in & out in a cylinder. piston creates constant flow rate of gas
linear drive piston
linear piston is referred to as ...
constant flow generator
electric motor rotates a wheel which moves the piston forward creating pressure & causing gas flow
rotary drive piston
in rotary drive piston when wheel continues to turn it moves piston away. This is when ...
rotary piston drive creates a variable flow pattern known as ...
fastest gas flow occurs when the wheel is at ...
the top of the circle
can be open or closed completely or can be controlled in increments
flow control valves
name the 3 ways a solenoid valve can be controlled
electrical timers or microprocessors
uses a motor to control a leer arm on scissor valve, moves in discrete steps to open & close the valve
stepper motor with scissor valve
ventilators are classified as either ... or ... designs based on whether the gas used to power the drive mechanism goes to pt
single or double circuit
in ... circuit, the gas goes directly from power source to the patient
in ... circuit, the gas from power source compresses gas in another mechanism (bellows), the source gas doesn't go directly to pt.
tubing which connects patient to ventilator
external circuit (patient circuit)
during inspiration, the exhalation valve ...
exhalation valve can be inside the ... or ...
ventilator or patient circuit on exhalation limb
joins the 2 limbs together at the patient airway
inspiration is begun by ...
name the 3 ways a ventilator can be triggered
1. time triggering
2. pressure triggering
3. flow triggering