{"id":83955,"key":"Global_Health_Medical_Device_Compendium/Negative_pressure_respirator","title":"Global Health Medical Device Compendium/Negative pressure respirator","latest":{"id":1267868,"timestamp":"2026-09-10T14:52:37Z"},"content_model":"wikitext","license":{"url":"https://www.appropedia.org/Appropedia:Copyrights","title":"CC-BY-SA-4.0"},"source":"[[File:Both.jpg|thumb]]\n\n{{GHMDC device data\n| health-topic = Respiratory\n| classification = Treatment\n| made = No\n| replicated = No\n}}\n\nLack of respirators in the developing world, regional difficulties in procuring ventilators and consumables. Limited trained healthcare workers with specialised airway skills.\n\n== Detailed description of the solution ==\n\nAfter further [https://www.appropedia.org/File:Ventilator.pdf research which is happening in this doc] and this [https://join.slack.com/t/helpfulengineering/shared_invite/zt-cmswa2ow-AUnXcjGBhrtLwi6dRq3jfw helpful engineering Slack channel]\n\nConsider taking the widely used 1950s Both Respirator design, give it an appropriate technology makeover and release it under an open-source licence\n\n{| class=\"wikitable sortable\"\n! Quantity\n! Material\n! Source\n! Cost ($)\n! Total ($)\n|-\n| 1\n| Car Battery\n| Amazon.com / local / repurposed\n| align=\"right\"| 70.00\n| align=\"right\"| 70.00\n|-\n| 2\n| Battery charger\n| Amazon.com / local / repurposed\n| align=\"right\"| 23.\n| align=\"right\"| 46\n|-\n| 3\n| Sheets 8 x 4 ply\n| local/ repurposed\n| align=\"right\"| 25\n| align=\"right\"| 75\n|-\n| 1\n| Linear actuator\n| Amazon.com\n| align=\"right\"| 25\n| align=\"right\"| 25\n|-\n| 1\n| 10l bucket\n| Amazon.com\n| align=\"right\"| 5\n| align=\"right\"| 5\n|-\n| 1\n| Dustbin\n| Amazon.com\n| align=\"right\"| 25\n| align=\"right\"| 25\n|-\n| 1\n| vacuum cleaner pipe\n| Amazon.com\n| align=\"right\"| 5\n| align=\"right\"| 5\n|-\n| 1\n| Used lorry or tractor inner tube\n| Amazon.com\n| align=\"right\"| 2\n| align=\"right\"| 2\n|-\n| 1\n| Box screws\n| Amazon.com\n| align=\"right\"| 2\n| align=\"right\"| 2\n|-\n| 1\n| Blocks of wood\n| local/ repurposed\n| align=\"right\"| 2\n| align=\"right\"| 2\n|-\n| 1\n| Gaffer tape\n| Amazon.com /local\n| align=\"right\"| 5\n| align=\"right\"| 5\n|- class=\"sortbottom\"\n| colspan=\"4\" align=\"right\" | '''Total Cost'''\n| align=\"right\"| '''~$262'''\n|}\n\n== Designed by ==\n\n* Case designed by: Edward Both https://en.wikipedia.org/wiki/Both_respirator\n* Pump design under development, the initial idea is to use a car window motor or linear actuator (where available) to move an upturned bucket up and down at the surface of a dustbin of water.\n* Manufacturer: Makerspaces, DIY\n* Manufacturer location: Almost anywhere\n\n== When and where it was tested/implemented ==\n\nWidely used in the 1940s and 1950's. Can be easily constructed from readily available materials. Less effective than modern mechanical ventilation techniques, but also less invasive https://en.wikipedia.org/wiki/Mechanical_ventilation\n \n\n== Funding Source ==\n\nUnknown at this point. Philanthropists? Crowdfunding? Get in touch\n\n== References ==\n\n=== Peer-reviewed publication ===\n\n* [https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-2044.1976.tb11849.x The development of apparatus for intermittent negative pressure respiration (2) 1919–1976]\n\n=== Other internally generated reports ===\n\n=== Externally generated reports ===\n\n[https://www.encyclopedia.com/medicine/divisions-diagnostics-and-procedures/medicine/iron-lung History of the Iron lung]\n\n=== IP and copyright ===\n\nGPL\n\n=== Approval by regulatory bodies or standards boards ===\n\nNone at present, unless some odd legacy thing allows their use\n\n{{Page data\n| sdg = SDG03 Good health and well-being, SDG09 Industry innovation and infrastructure\n| license = CC-BY-SA-3.0\n| language = en\n}}"}