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3D Printed PAPR Hose AdapterMaintenance and Assembly GuideSummaryThis hose adapter was designed in collaboration with Kaiser Permanente in Oakland, CA to provide PPE relief during the COVID-19 pandemic. This design is made to interface between the older 3M BE-10L PAPR hoods and the newer 3M BT-30 hoses that come standard with 3M Versaflo units. These parts are reusable and this guide will provide a detailed overview of how to assemble/maintain the adapter.Safety PrecautionAll PAPR systems will keep a positive pressure environment under normal conditions. However, in extreme circumstances, with or without this hose adapter it is possible for systems to be over-breathed. Please exercise caution when using PAPRs in areas with a risk of infection.4819650142875Parts OverviewHose Interface: This is the exterior structural piece that interfaces with the BT-30 hose. The color of the plastic does not matter and, unless otherwise specified, should be made from PETG.4676775847725Hood Interface: This part sits on the inside of the hood and provides strength and rigidity to the adapter assembly by threading into the hose interface. The color of the plastic does not matter and, unless otherwise specified, should be made from PETG.46767751133475Interior Gasket: This part rests pointed-side down inside a channel at the base of the hood interface. The interior gasket prevents minor air leakages and distributes the load when the adapter is tightened down. Early prototype versions were made in black TPU, the newer gaskets are made with blue TPU. Both versions are completely usable.467677512192004676775866775Exterior Gasket: This part rests over the bottom lip of the hose interface. The exterior gasket prevents minor air leakages and distributes the load when the adapter is tightened down. Early prototype versions were shorter and made with black TPU, the newer gaskets are made with white/clear TPU. Both versions are completely usable.467677588582546958251238250AssemblyAll adapters should come pre-assembled, in which case the assembly process is as follows:Before mounting the adapter, test that the screw threads are smooth by screwing the hood interface onto the hose interface. If the parts get caught at any point before reaching the bottom, twist the parts 4-5 times to remove any plastic that may be jamming the threads. The hood interface, with the interior gasket inserted, needs to be pushed through the female hose port from the inside of the BE-10L PAPR hood.The hose interface, with the exterior gasket wrapped around the lower lip (or loosely placed on the bottom, depending on the version) needs to be screwed onto the hood interface from the outside of the BE-10L PAPR hood.Loosely screw the hose interface until it touches the hose port of the BE-10L PAPR hood and becomes finger-tight. Then, gripping the textured edges of the hood and hose interface, tighten down the parts completely until it stops, and then advances one last time.In the case that the adapter comes with missing, loose parts, or needs to be disassembled, the assembly process is as follows:Place the interior gasket over the hood interface with the tapered, pointed side down. The shape of the gasket should match the groove on the hood interface and leave a flat surface. The black interior gaskets may be looser fitting, be careful not to confuse them with the black exterior gaskets.There is a slightly different assembly procedure for the two types of exterior gaskets.If your exterior gasket is black and has flat faces, simply place the gasket over the bottom lip of the hose interface with the walls pointing up (away from the hood). Be careful not to confuse the black exterior gaskets with the black interior gaskets.If your exterior gasket is white/clear, wrap the gasket around the bottom lip of the hose interface with the wider side on the bottom (towards the hood).The rest is the same as the pre-assembled adapter procedure.SterilizationThe hose and hood interfaces are printed from PETG (Polyethylene Terephthalate Glycol), which is safe to wipe with isopropyl alcohol, oxycide, and clinical bleach. These parts are also UV-resistant and can be cleaned with soap and water, but cannot be steamed or placed in an autoclave.The interior and exterior gaskets are printed from TPU (Thermoplastic Polyurethane). These parts can be wiped with isopropyl alcohol (confirmed) and likely clinical bleach (unconfirmed), but it is not recommended for them to be left submerged or exposed to their fumes. Similarly, Oxycide in small quantities may be used to sterilize TPU, but cannot be left on as polyurethane degrades in the presence of hydrogen peroxide (untested). In such cases it has been observed that parts will lose their elasticity. TPU can also be cleaned with soap and water.Reference Images132385019716753238503943350114300 ................
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