Non-invasive positive pressure ventilation (NPPV), an artificial respiration therapy, is a treatment in which a mask is attached to the patient’s face and delivers gas into the mask to support breathing. The NPPV mask straps are required to attach and secure the mask in the appropriate facial position, but the tension strength of the strap is adjusted by the sensation of the hands. The strap uniformity and fine-tuning strap tension are judged by the skill of the operator and the amount felt by the finger. In the future, additional strap operation and adjustment methods will be required to meet the needs for reducing the burden on the face.

In this study, we fabricated a mechanism that can control the fine adjustment and fixing of the tension of the mask straps. A small amount of strap tension can be adjusted by operating the shaft. This makes it possible to control slight tension that is difficult to grasp with the sense of the operator’s hand. In addition, this mechanism allows the operator to control the strap while controlling the movement of the mask body. This leads to the establishment of a mask fitting method suitable for each patient. The developed stabilizing technique simplifies operator mask fitting, allows strap operation and adjustment, and reduces facial strain.