PROBLEM TO BE SOLVED: To provide an oral cavity expander for maintaining an oral cavity in an expanded state in order to perform various kinds of medical treatments inside the oral cavity such as a dental treatment, an intraoral treatment, an operation and a surgery.SOLUTION: The oral cavity expander includes a lower jaw member 11 and an upper jaw member 12 roughly in a U shape, brackets 13 and 14 are attached to proximal ends at both ends of the lower jaw member 11 and the upper jaw member 12, and curve parts of the brackets 13 and 14 are turnably connected by hinge pins 15. In the state of opening the upper jaw member 12 relative to the lower jaw member 11, a tension lever 18 attached to the bracket 14 of the upper jaw member 12 is locked to locking recesses 20-22 of the bracket 13 of the lower jaw member 11, and the state that the upper jaw member 12 is opened relative to the lower jaw member 11 is maintained.COPYRIGHT: (C)2013,JPO&INPIT【課題】歯科治療、口腔内治療、施術、手術等の各種の口腔内の医療を行なうために口腔を拡張状態に維持する口腔拡張具を提供する。【解決手段】ほぼU字状をなす下あご部材11と上あご部材12とを備え、これらの下あご部材11および上あご部材12の両端の基端部にブラケット13、14を取付けるとともに、ブラケット13、14の湾曲部をヒンジピン15によって回動可能に連結し、下あご部材11に対して上あご部材12を開いた状態で上あご部材12のブラケット14に取付けられている突張りレバー18を下あご部材11のブラケット13の係止凹部20~22に係止して下あご部材11に対して上あご部材12を開いた状態で維持する。【選択図】図3
