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Vacuum Suction NIV Respiratory Mask
Vacuum Suction NIV Respiratory Mask
The final design is a functioning non-invasive respiratory mask that is aided by the addition of a vacuum channel around the edge of the patient-mask interface.
The mask allows for a vacuum source to be attached via a vacuum tube to the front of the mask, and routed throughout the channel to create a uniform suction force onto the patients face. The channel geometry is derived from curve fitting to a statistically averaged medium face form[4]. The mask design includes four attachment points for head straps, and has two ports for the attachment of both a vacuum and ventilation source. Directly underneath the suction channel, the mask has an airflow channel for routing the vacuum source from the connection point underneath every section of the suction channel.
Vacum and Ventilator
Vacum and Ventilator
Unlike regular non-invasive respiratory masks, this mask has an extra vacuum connection
Suction Channel
Suction Channel
A channel between the environment and patient that prevents aerosol leak and improves the face seal
Headform
Headform
An averaged faceform for modeling and testing the respiratory mask
Airflow
Airflow
Modeling for Facial Geometry
Modeling for Facial Geometry
In order to create an effective silicone face seal, the edge of the mask that contacts the patients face needs to match general face geometry, with key considerations for different areas (Chin, Nose, Cheek, etc.)
The National Institute for Occupational Safety and Health has public available stereolithography files of statistically averaged face forms available for download. We designed our mask around the medium-symmetry face form to start.
Silicone Molding
Silicone Molding
Iterating on mask designs was imperative for this project, so we learned how to utilize 3D printing in order to rapidly prototype molds for different suction channel geometries.
Testing
Testing
To test different suction channel geometries in between prototypes, we manufactured six different linear silicone vacuum channels that we tested against increasing weight until failure. This let us not only determine the geometry with the best seal against various surfaces, but also the geometry that would be effective and comfortable under the least vacuum generation.
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