OxyPet is an innovative nasal oxygen respirator designed for children. Its headband ensures that the rigid oxygen tube maintains an appropriate distance from the face, minimizing discomfort and avoiding facial irritation. Additionally, the joints of the oxygen tube can be rotated to adjust the angle of insertion to fit the child’s face, and can be detached to adjust the width of the face. The friendly, animal-shaped design helps alleviate children’s fear of medical devices and adds fun to the experience. Allowing children to customize the oxygen respirator according to their personalities through a playful process helps them accept medical devices more naturally.