Design Of a Novel Low-Cost 3D-Printed Respiratory MuscleTrainer for Post-Covid Rehabilitation for LMIC

Abstract

Respiratory Muscle Trainers (RMTs) are proven to be useful in improving the condition of patients after breathing-related conditions like COVID-19 or COPD. These RMT devices are neither well-available nor affordable in most Low- and Middle-Income Countries. Therefore, the aim of the study was to design a low cost RMT. Requirements were formulated based on discussions with clinical staff. A 3D printed design was made and a number of prototypes produced. The design was evaluated in a pilot study. Most important requirement was to have a calibrated expiratory pressure range of 0 to 80 cmH₂O. A number of RMT devices were produced using a 3D printer. The calibrated design was successfully tested on technical specifications. Material costs of the final design was USD 1.30. A short clinical test indicated positive effect on the condition of a post-COVID patient. This study showed that it is possible to design an effective, affordable 3D printed RMT device that needs no more resources than a 3D printer, PETG filament, and a well-available spring. The initial clinical tests indicated the effectiveness of the device, as the condition of a post-COVID patient rapidly improved after using the device. Future research is required to further validate the clinical effectiveness of the novel device.