This invention is to provide an endotracheal tube stylet insertable into an endotracheal tube, the endotracheal tube stylet comprising: a first coupling member; a second coupling member coupled to the first coupling member; an operable member connected to the first or the second coupling member, the operable member being capable of changing the relative positions of the first and the second coupling members; and a turnable member connected to the first or the second coupling member, wherein the turnable member may be redirected by the change of the relative positions of the first and the second coupling members so as to change the shape of the endotracheal tube.
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