英文: Abstract: The mechanical structure of washboard valve leveler is introduced ,The alignment mechanics of curving bar and hemilateral
pan of the valve is analyzed, The mechanical ,the shape of washboard and the effect of alignment quality and efficiency cau
英文: Results All of the patients were found unnormal by x-ray recording examination. In the patients there were tardy swallowing 77 cases,hemilateral
barium 8 cases,barium stagnate at pharynx cases,osculum swallowing 0 cases and barium leaked 8 cases.