Film Oxygenators:
1) Stationary Screen
eg Mayo-Gibbon
Type of oxygenator used by Gibbon for the first successful open
heart operation
Simply a cabinet containing a series of upright screens in an
oxygen atmosphere. Venous blood was introduced by way of a series of slits at
the top of the cabinet which was engineered so as to encourage filming over the
screens. Arterialised blood collected at the bottom of the cabinet to be
returned to the patient
Blood is allowed to form a very thin film on a metal plate &
is exposed to oxygen
A screen of wire mesh is used to cause turbulence at the blood
gas-interface thereby greatly increasing the efficiency of oxygenation
Require large priming volumes & difficult to sterilise
2) Rotating Disc Film Oxygenator
1956
Kay-Cross apparatus
It had multiple vertical discs placed on a horizontal axis that
rotated, with the discs dipping into a pool of venous blood, creating a film on
the discs in an atmosphere of oxygen
Capable of good oxygenation
But: required large priming volumes of blood (ineffective with
hemodilution], cumbersome, difficult to clean & sterilise, nondisposable,
took all day to set up
Replaced by bubble oxygenator
KCPotgerΣ