ISRO invents 3 types of ventilators to fight COVID-19

By VARINDIA - 2021-06-08

ISRO invents 3 types of ventilators to fight COVID-19

The Indian Space Research Organisation has developed three types of ventilators, and has come forward to transfer the technology to industry for clinical usage as the country battles the second wave of COVID-19 pandemic. A low-cost and portable critical care ventilator, ‘PRANA’ (“Programmable Respiratory Assistance for the Needy Aid’) is based on the automated compression of an AMBU (Artificial Manual Breathing unit) bag.

 

The system has a sophisticated control system that includes airway pressure sensor, flow sensor, oxygen sensor, servo actuator as well as expiration and PEEP (Positive End Expiratory Pressure) control valves, according to an interest exploration note posted on the website of Bengaluru-headquartered space agency.

 

The clinicians can select the ventilation mode and set the required parameters through a touch screen panel and monitor various parameters like pressure, flow, tidal volume and oxygen concentration on the same screen. The ventilator can deliver the required flow of oxygen-air mixture to the patient’s lung at a desired rate set by the clinicians. It has a provision to attach an external battery for backup during power failure.

 

ISRO said PRANA supports both invasive and non-invasive ventilation modes and is capable of giving mandatory breaths (controlled by ventilator) as well as spontaneous breaths (controlled by the patient). A robust algorithm for controlled and safe ventilation of the patient is implemented which raises alarm and opens safety valves to prevent barotrauma, asphyxia and apnoea during the ventilation. Alarm is also raised in case of wrong or improper connection of the ventilation circuit or inadvertent disconnection of the hose or sensors. There are also provisions to attach bacterial viral filters at each interface to prevent cross-infection and the contamination of air.

 

The ICU grade positive pressure mechanical ventilator titled ‘VaU’ (abbreviation of Ventilation assist Unit) can assist or replace the spontaneous breathing in patients under respiratory distress, ISRO said. 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. 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.

 

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 acquired signals from an array of sensors and commands the electro-pneumatic components to effect closed loop control. 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.

 

The basic design is simple, and the components can be easily mass produced for emergency use in pandemic-like situations. This ventilator, which runs on compressed air, is able to perform various ventilation conditions using manual mechanical settings. The system is capable of pressure control ventilation (PCV) in its basic mode of operation with provision for setting different tidal volumes. The basic ventilator design can be re-engineered appropriately by the manufacturer to cater to various modes of ventilation with control systems, electronics, and associated software.

 

The prototype of the three ventilators developed at Thiruvananthapuram-based Vikram Sarabhai Space Centre (VSSC), a major space research centre of ISRO, has undergone in-house test & evaluation and meets various specifications.


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