UNO GAS EXHAUST UNIT

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The UNO Gas Exhaust Unit can be used for the direct-exhaust of waste anaesthetic- and exhaled gas while using face masks for rat and mouse.

               Further the UNO Gas Exhaust Unit can be used for the indirect- exhaust of the excessive anaestheticgas from the circle system of the UNO Micro Ventilator (UMV) at various volume- and pressure settings of the UMV.

In order not to spill the anaesthetic gas mixtures, and for good functioning of the Gas Exhaust Unit, the supply of the gas mixture to the face masks should be set at a maximum of:

  • Face mask - rat: -350 ml/min*1
  • Face mask - mouse: -260ml/min*2

The supply of the anaesthetic gas mixture to the UNO Micro Ventilator (UMV) is set at a lower level, because with the use of the UMV and the correct size intubation tube, there is hardly any waste of anaesthetic gas mixture*3

*1 Rat:

  • tidal volume: ca. 2,5ml
  • breathing frequency during anaesthetic: ± 60-70/min
  • total breathing volume / min: 150 - 175 ml/min
  • not all gas supplied is "used" by the rat and as a rule of thumb, the gas supply to the face mask is about twice the breathing volume/min, i.e. 300 - 350ml/min.

*2 Mouse:

  • tidal volume: ≤ 1ml
  • breathing frequency during anaesthetic: ± 110 - 130/min
  • total breathing volume / min: 110 - 130 ml/min
  • not all gas supplied is "used" by the mouse and as a rule of thumb, the gas supply to the face mask is about twice the breathing volume/min, i.e. 220 - 260 ml/min.

*3

The supply of gas to the UMV for inhalation anaesthesia with ventilation through an intratracheal tube should be slightly higher than the total breathing volume per minute both for rat and mouse (taking into account the minimum required flow (supply) for the vaporizer).

 

The UNO Gas Exhaust Unit can either be connected to an inhouse exhaust system or you can connect an Active Charcoal Absorbtion filter (to absorb the isoflurane) to the unit.

For connecting the UNO Gas exhaust Unit to other parts in your anaesthesia set-up we have special designed valves available:

 

This valve also connects the gas exhaust from 2 other items, like a face mask and induction box to the UNO Gas exhaust Unit. You can than choose to either have the exhaust unit working for the face mask or for the induction chamber, but is also used to connect the gas supply to either the face mask or induction box. By switching the valve you have direct both gas supply and gas exhaust from one item to the other. On request a valve to        connect 3 other items is also available.