Locking mechanism for aerosol drug delivery device

The locking mechanism according to claim, 1, wherein the fastening member further includes:

• a connecting portion having a screw hole for engaging with the screw;
• and
• a connecting arm having one end connected with the connection portion and another end being the fastening portion.

A method of using the locking mechanism for an aerosol drug delivery device, the aerosol drug delivery device including a first housing having at least one contact portion and at least one fastening space formed beside the contact portion, a second housing rotatably connected with the first housing along a rotation axis, a screw rotatably connected with the second housing and being capable of rotating relative to the second housing along a central axis parallel to the rotation axis, and a fastening member movably connected with the screw and capable of being driven by the screw to move toward the contact portion, the fastening member including a fastening portion, the method comprising the steps of:

• rotating the second housing relative to the first housing to rotate the screw along the central axis to drive the fastening member to move toward the contact portion;
• and
• further rotating the second housing relative to the first housing to make the fastening portion be displaced when contacting with the contact portion and then enter into the fastening space to limit the relative rotation between the first housing and the second housing.