Technology Transfer of Centrifugal Blower based Critical Care Ventilator- ‘VaU’

Interest Exploration Note

VSSC/ISRO has developed an ICU grade positive pressure mechanical ventilator titled ‘VaU’ ((वायु)), (abbreviation of Ventilation assist Unit), which can assist or replace the spontaneous breathing in patients under respiratory distress.

VaU is based on a centrifugal blower which draws in filtered ambient air, compresses it and delivers it to the patient to achieve ventilation and can therefore operate without a compressed pneumatic source. Provision is also given in the ventilator to connect a high pressure oxygen source, from which oxygen is metered automatically, to achieve the desired oxygen concentration (FiO2) in the inspiratory flow. Microcontroller based control module in the ventilator acquires signals from an array of sensors and commands the electro-pneumatic components to effect closed loop control.

VaU also comes with an intuitive Human Machine Interface (HMI) System running on a medical grade touch screen PC, which allows the operator to set and monitor various ventilation parameters in real time. A power supply unit, which can operate with 230VAC or an internal battery pack, is used to power the electro-pneumatic components, controller, and the HMI system of the ventilator. VaU has been configured to operate in a variety of patient/ventilator triggered invasive and non-invasive ventilation modes and has provisions to detect fault conditions and raise alarms through the HMI system to alert the operator.

Centrifugal Blower based Critical Care Ventilator- ‘VaU’








Centrifugal    Blower  based  Positive  Pressure                  Mechanical Ventilator suitable for ICU applications.


Operation Modes



Inspiration flow rate

Upto 200 LPM


Tidal Volume

0 to 2000 ml


FiO2 Control

21 to 100 % (from regulated O2 source of pressure 2 bar)


Inspiratory Pressure

0 to 60 cm H2O (Relief setting at 80 mbar)


PEEP Pressure

5-30 cm H2O


Respiratory Rate

0 to 60 (with settable I:E ratio)


Net Weight

20 Kg



Mech. Interfaces

  • ISO 5356 - 22 mm OD connectors for double limb breathing circuit.
  • ISO 18082 – NIST connector for oxygen supply.




Additional Capabilities

  • Inbuilt Touch Screen HMI for operation and monitoring
  • Pressure/Flow trigger options to detect patient inspiration effort
  • Proximal flow/Pressure Measurement & Control.
  • FiO2 control using 2 bar high pressure O2 source.
  • Detection of fault conditions and alarm generation.



Dimensions in mm

350*250*200 (without display) 350*250*450 (with display)

The proto type developed at VSSC/ISRO has undergone in-house test & evaluation and meets the specifications given above. The responsibility of obtaining mandatory certification from approving agencies of government of India before clinical usage vests with the industry.

ISRO intends to transfer the technology of VaU (वायु) Ventilator to PSUs/Industries/Start-ups having good track record in manufacture of critical medical/electronic equipment manufacturing.

Interested industries / entrepreneurs are requested to submit their expression of interest along with details as per attached annexure in the email address provided below for the purpose of evaluation. Shortlisted industries will be contacted over the email address provided, along with the details.

Last date for application: 5 pm on June 25, 2021.

The EoI applications and all communications are to be send to

Download Response form for ToT of “VaU” Ventilator