How Vents Work Flashcards
How are vents powered?
Gas (pneumatic)
Electric
Combined ^
The operator sets controls using a _____?
Control Panel or User Interface
“Pulls” open the lungs
Negative Pressure
“Pushes” open the lungs
Positive Pressure
What are the two pneumatic circuits?
Internal Circuit
External Circuit
Single circuit or double circuit
Internal Circuit
Tubing (ventilator) to patient
External Circuit
Unintelligent System
Open System
Intelligent System
Closed System
Explain an Unintelligent System (Open)
Desired parameter is set —-> [Ventilator control system] ——-> output
Control panel is the outside surface of the ventilator. It is monitored and set by the user. Controls govern the four physical parameters
volume, time, pressure and flow
reads and interprets what is set and controls the function of the drive mechanism.
Internal control system
What connects the vent to pts airway
External Circuit
Name 4 components of the External Circuit
Main inspiratory line
“wye” adapter to patient
Expiratory line
Expiratory valve ( internal or external)
Devices used with Patient Circuit
Warm and humidify air Temperature sensing device An apnea or low pressure alarm A nebulizer line Volume measuring device Bacteria filter A pressure gauge - proximal
Volume displacements designs
Bellows
Pistons
Flow valves
Solenoids
powered by and electric motor
Piston
Can be divided into volume controllers or flow controllers
Power Transmission
Power Transmission and Conversion
Conversion of power source to work
Work provided by the drive mechanism
Compressors or bellows
generate the actual force needed to deliver gas under pressure
Drive mechanisms
consists of one or more valves that regulate flow to the patient
Output control
Volume displacement
bellows
Flow Control Valves (3)
Proportional solenoids
Stepper motor with valve
Digital Valve - on/off configuration
Volume Displacement Designs
Proportional solenoids
Stepper motor with valve
Digital Valve - on/off configuration
Compressors can be (4)
piston driven, rotary blades, moving diaphragms or bellows
Compressors volume can be changed by
compressing space that will increase pressure
Often used as the power source or for converting and transmitting a power source
Compressors or Blowers
Most modern vents have what kind of valve?
flow control
Flow Control Valve Design (3)
Proportional Solenoids
Stepper motor with valve
Digital valve, on-off configuration
