LAUSR

peroral gastrointestinal (GI) endoscopy is considered a highrisk procedure for possible viral transmission. Several devices have been developed to prevent or remove aerosol droplets, such as masks and box-type droplet prevention devices. However, in the case of masks, aerosol droplets arising during scope insertion cannot be completely prevented. In addition, the boxtype droplet prevention device can keep aerosol from the patient’s mouth inside the box; however, upon removal of the box, the aerosols spread into the air, which is considered a problem. A transportable high-flow extractor (Free-100M; Forest-One Co., Tokyo, Japan), which has been used in the dental field, has been reported to be used for aerosol droplet control in the medical field. However, Free-100M has a large body and vacuum cup, as well as noise generated while vacuuming. Therefore, Free-100Next (Forest-One Co.) was developed as an improved version of Free-100M, as a novel transportable high-flow extractor. Free-100Next has a smaller body than Free-100M, and the vacuum cup is also smaller, with a diameter of 12 cm (Fig. 1A). The noise volume while vacuuming was also reduced by approximately 20% compared to the Free-100M. In addition, Free-100Next is equipped with a special filter called the ulAerosol extractor for COVID-2019 prevention during endoscopic procedure