An automated ventilator kit built for $300 that is 'as simple as it gets' squeezes a manual mask to keep coronavirus patients alive, developers claim.

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A team from Rice University developed the emergency care system from readily available hospital valve masks and 3D printed parts.  

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The programmable device automatically squeezes the bag valve masks that would otherwise have to be manually squeezed by a medical professional.

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Researchers say the 'DIY kits' will allow hospitals to use existing equipment to reduce the load on existing ventilators and help people in respiratory distress.