Search our site 
Advanced Search
Home | Exam dates | Contact us | About us | Testimonials |

You are in Home >> Resources >> Physics and equipment >> Scavenging

Types of scavenging system III

Created: 23/11/2004

Active systems

These systems connect the exhaust of the breathing system to the hospital vacuum system via an interface controlled by a needle valve.

The Ohio scavenging interface has connections for the outlets from the breathing system and ventilator (A), one or two reservoir bags (B) and the vacuum line (V). The suction is controlled by the needle valve (N). There are both positive (P1) and negative (P2) pressure relief valves in case the reservoir bag becomes empty or too full.

An example of a simple scavenging system:

This consists of a reservoir made of plastic pipe of around 3" in diameter and 2 feet in length, capped at both ends and with a needle valve fitted at the bottom. Two holes are drilled in the top cap, one to allow the hose from the outlet of the anaesthetic machine to be inserted and the other to allow passage of atmospheric air. The valve is adjusted so that air is slowly sucked into the pipe when the anaesthetic machine is in use: this will prevent waste gases escaping into the atmosphere.


 Convenient in large hospitals, where many machines are in use in different locations


 Vacuum system and pipe work is a major expense
 Needle valve may need continual adjustment

SiteSection: Article
  Posting rules

     To view or add comments you must be a registered user and login  

Login Status  

You are not currently logged in.
UK/Ireland Registration
Overseas Registration

  Forgot your password?

This section is sponsored with an educational grant from Baxter.

All rights reserved © 2022. Designed by AnaesthesiaUK.

{Site map} {Site disclaimer} {Privacy Policy} {Terms and conditions}

 Like us on Facebook