Chapter 2 - How Ventilators Work Flashcards
What are 3 Electrically Powered Ventilators?
- Lifecare PLV-102
- LTV - 800/900/1000
- Intermed Bear 33
What are Electrically Powered Ventilators best for?
Transport and Homecare
What are the 2 types of Pneumatically Powered Ventilators?
Pneumatic-pneumatic
Fluidic-pneumatic
What do Pneumatic-pneumatic ventilators use?
What’s an example?
Uses needle valves, Ventur entrainers, diaphragms, and spring loaded valves
Ex: Bird Mark 7
What special principles do Pneumatic-fluidic ventilators use to control gas flow?
What’s an example?
-Wall Attachment
-Beam
Ex: Bio-Med MVP-10
What are the significant things about Combined Power Ventilators
- Uses 50 psi Gas & Electricity
- Gas source controls FiO2
- Microprocessor controlled
- Requires 2 gas sources or a compressor for variable FiO2
How does positive pressure ventilators deliver a breath?
By increasing pressure at the airway > P(alv)
How does negative pressure deliver a breath?
By creating negative pressure around the body surface.
Simulates normal breathing mechanism
What modes are Closed Loop Systems?
PRVC and MMV
What modes are Open Loop Systems?
Everything except PRVC and MMV
What is an Open Loop System?
- “Unintelligent”
- Operator sets control and vent cannot deviate from those settings
What is a Closed Loop System?
- Vent can be programmed for certain variables
- Able to compensate for a leak
- Can monitor the pt’s output and compensate
What can be regulated?
Flow, Volume, Pressure, Time
What’s composed in a Pneumatic Circuit?
Internal & External Circuit
What are the two types of internal circuits?
Single Circuit - Gas flows directly to patient
Double Circui - Gas flows into bellow or piston, then out to patient
