Mandibular advancement apparatus

A mandibular advancement device comprising:

• a driving unit comprising an intraoral device;
• a main body configured to generate a driving force for driving the driving unit;
• and
• a connection unit configured to connect the driving unit and the main body to transmit the driving force generated by the main body to the driving unit,
• wherein the driving unit comprises a driving case having an empty space therein, a coupling unit having fixed thereto the intraoral device and coupled to a front of the driving case, and a rear cover coupled to a rear of the driving case and accommodating a piston therein,
• the intraoral device comprises a first frame and a second frame located to overlap each other, a first seating portion covering a portion of the first frame located in an oral cavity of a user, a second seating portion covering a portion of the second frame located in the oral cavity of the user, and a fixing unit coupled to the first frame and the second frame,
• the first frame is coupled to the fixing unit to be relative movable with respect to the second frame, the second frame is fixed to the fixing unit, and the fixing unit is fixed to the coupling unit,
• wherein the piston comprises a piston head disposed in the rear cover and a push arm protruding from the center of the piston head toward the fixing unit, and,
• when the piston is moved by the driving force, the push arm pushes the first frame, wherein the piston further comprises a fitting protrusion protruding in a direction perpendicular to a direction in which the push arm extends,
• the driving unit further comprises a lower cover coupled to the bottom surface of the driving case and
• a rod and a guide covering the rod are arranged on the lower cover, and
• the guide comprises a hole extending in one direction, and
• the rod protrudes to the outside of the guide through the hole and is coupled with the fitting protrusion.