Respiratory support system

A respiratory support system comprising:

• an adaptor formed as part of a respiratory system accessory device, said adaptor including an injection fluid opening therein,
• a manifold adapted to be connected for fluid flow attachment between a patient and a ventilator circuit said manifold including an injection fluid inlet opening therein, said manifold including an accessory access port for allowing attachment of said adaptor to said manifold, said accessory access port being normally closed against fluid flow therethrough, said accessory access port further including an injection fluid inlet opening therein, and
• said adaptor further including means for opening said accessory access port in response to attachment of said adaptor to said accessory access port to allow fluid flow access between said manifold and said respiratory system accessory device,
• means interconnecting said adaptor and said manifold such that, when said adaptor is positioned in said accessory access port of said manifold, said injection fluid inlet opening is in fluid communication with said injection fluid opening of said adaptor regardless of the relative rotational orientation of said adaptor and said manifold, whereby fluid can be injected through said injection fluid inlet opening and said injection fluid opening into said adaptor.