Ch. 20 Oxygenators

Question 1

Bubble Oxygenators

Answer 1

first in 1955 with DeWall and Lilehei

-poor gas control, micro emboli, goes through defoamer

Question 2

Membrane Oxygenators (3 components)

Answer 2

first by Lillehei and Lande
cool/warm, remove CO2
no direct gas blood interface
-venous res, oxygenator, Heat exchanger

Question 3

Venous Bag

Answer 3

• hard to remove air
• no vacuum
• fuller the bag= increasing the resistance= less venous drainage***

Question 4

3 types of membrane oxygenators

Answer 4

1) rolled flat plate (silicone)- ECMO, long term use
2) flat plate
3) hollow fiber (polypropylene)= BEST= gas through fibers, blood on outside

Question 5

Gas Transfer Rate formula

Answer 5

Gas Transfer Rate= Driving Pressure x Permeability

• driving- difference of pressure across membrane
• totally undefended of other gases