What does the APL valve do?

What does the APL valve do?

The adjustable pressure-limiting (APL) valve is part of the anaesthesia machine breathing circuit. The APL releases anaesthetic gases into the scavenging system and is intended to provide pressure control in the breathing circuit during manual bag ventilation.

How do you use a bain circuit?

The Pethick Test for the Bain Circuit

1. Occlude the patient’s end of the circuit (at the elbow).
2. Close the APL valve.
3. Fill the circuit, using the oxygen flush valve.
4. Release the occlusion at the elbow and flush. A Venturi effect flattens the reservoir bag if the inner tube is patent.

What is a bain circuit?

ASE Resources: Bain Circuit Bain Circuit A co-axial modification of the basic T-piece system, developed to facilitate scavenging of waste anesthetic gases. Construction An tube carrying fresh gas (F) travels inside an outer reservoir tube (R) to the endotracheal tube connector (P).

What is a bain Mapleson circuit?

Bain Mapleson Circuit offered is modification of Mapleson D system and comprises coaxial system where fresh gas flows through narrow inner tube which is present within outer corrugated tubing.

What is the difference between the Bain and Bain T-piece?

Fresh gas flow requirements–see separate article. The Bain is more efficient at eliminating exhaled gas, since the fresh gas is directed down the endotracheal tube, which reduces dead-space. Modifications A bag may be added to the tail of the reservoir tube, as in the T-piece.

What is a parallel Bain system?

Alternatively, the so-called ‘parallel Bain’ system may be used. In this system, the inner and outer tubes are replaced by conventional circle-absorber-type tubing and Y-piece. This arrangement is also used in the Humphrey ADEsystem.