From this bird's eye view, similar to external hexagon screws, removal tools are generally sold in hardware stores. If you want to remove the screws on it, you can use a pair of needle-nosed pliers to remove them. Just clamp the needle-nosed pliers at two opposite notches, hold them tightly, and then rotate them counterclockwise. Of course, vice can also be used. It is best to ask medical device manufacturers to provide professional tools.