Small Animal Ventilator

Small Animal Ventilator

Key Features

  • Continuously monitors airway pressure.
  • All animals must be intubated.
  • Ability to vary the maximum airway pressure.
  • Controllable expiratory length.
  • Unique stainless steel t-piece assembly.
  • Valve bypass switch.
  • Status indicators show the valve position.
  • Clear 2-digit display shows the maximum inspiratory pressure allowed before the valve opens during the expiratory phase and shows the difference between the airway pressure and target pressure during the inspiratory phase.


  • Reliable method of controlling ventilation in small patients.
  • Due to the bypass switch, this unit may be used as a normal T-piece assembly until IPPV is needed (unaided respiration may occur until needed).
  • Compatible with standard 15mm ET tube connectors.
  • A wide variety of animals may be ventilated.

How it works

  • IPPV- intermittent positive pressure valve.
  • Unit uses the pressure of the incoming gases as the driving force to inflate the patient's chest.
  • User sets a limit in airway pressure ranging from 1 to 40 cm H20.
  • Once pressure reaches limit, the expiratory valve opens allowing the patient to exhale.
  • There is a timed delay that the user sets between 1 and 30 seconds before the valve closes and inspiration begins again.

Technical Information on Calculating Trigger Values

Due to the wide diversity of species and types this Ventilator was designed for, it may be difficult to produce a formula for calculating trigger value settings. In such cases proceed as follows:

  • Start IPPV at 3cm H20 trigger value every 1-2 seconds.
  • The short breathing interval is only temporary but helps to quickly assess breathing depths.
  • Once set, the frequency may be reduced to normal.
  • Increase the pressure setting until normal chest excursions are seen.
  • The pressure setting required will depend upon the weight of the animal, degree of obesity, and the functional resistance in the airway circuit.
  • Functional resistance is higher in very small animals and a higher trigger pressure setting will be deeded in them.

Once practiced, this can be assessed and set within a matter of seconds. Adjust the incoming gas flow rate to control the duration of inspiration; faster flow rates will give shorter inspiratory times.

If you have any further questions, feel free to contact Keith Simpson at or visit his web page at Keith qualified from Bristol University Vet School in 1986 and since that time has been in first opinion veterinary practice. For the first 4 years he worked mixed practice but since 1990 has been almost exclusively a small animal clinician. Keith is also a professional electronics engineer and a member of the Institute of Incorporated Engineers which he joined in 1994.

Suggested Values for Ventilation of Some Exotic Species

There is no formula for determining the pressure setting of the Vetronics ventilator since the pressure and resulting volume are dependant fully on the compliance of the respiratory system of the animal being ventilated. However some average values are given as a guide. There is no danger in using the upper value in any of the ranges given but the operator must assess the degree of ventilation by observation and adjust for normal chest excursions or limb movements.

Small/ thin 5cm H2O - large/fat 10cm H2O
Set pressure for normal chest excursion.

Small 6 cm H2O - large 10cm H2O
Set pressure for normal chest excursion. Note that the long trachea may require a higher pressure setting than above to achieve full ventilation.

Normal range 8 - 10 cm H2O
Set the pressure to produce small outward movements of the hind limbs as an indicator of intra-coelomic pressure.

Tracheal or air-sac ventilation. Normal range 4 - 12 cm H2O
Set the pressure for normal chest movements.

In use, observe the patient before induction and mimic the respiratory rate and movements during anaesthesia.

Ventilator Specifications

  • Intended Use: animals up to 22lbs (10KG) and down to 10g.
  • Anesthetic Apparatus Configuration: Standard T-piece with Halothane/N20/02 mixture
  • Mode of Operation: IPPV by outlet occlusion
  • Preset Trigger Range: 0 - 40 centimeters water pressure
  • Resolution: 1 centimeter water
  • Expiratory Phase Range: 1 to 30 seconds
  • Respiratory Rate Range: 2 to 60 breaths per minute (depending on inspiratory flow rate)
  • Supply Voltage: 100-240 volts 50/60 Hz AC only
  • Power Consumption: 60 VA
  • Rear Panel Fuse Rating: 1 AMP 250 Volt Slow Blow Only

Example Ventilator Setup

Payment Terms

  • Prepayment (Visa, Master Card, Discover and American Express)
  • Net 30 w/Approved Credit

Ordering Information

VT-5000 Vetronics - Small Animal Ventilator
VT-5051 Vetronics - Ventilator Anesthesia Kit (15mm o.d.)
VR-4000 Vetronics - Ventilator inlet gas connector
VR-4001 Vetronics - Ventilator cuff - 15mm/22mm female
VR-4002 Vetronics - Ventilator adapter 22mm x 15mm
VR-5000 Vetronics - Ventilator corrugated tubing