Controllable timing back-patting sputum-excretion device

The invention relates to the technical field of medical instruments, in particular to a controllable timing back-patting sputum-excretion device. The device comprises a back-patting device body, the back patting device body is of an inverted bowl-shaped structure, an opening is formed in the upper portion of the device body, an air bag is arranged on the circumference of the lower end face of theback-patting device body, a clamping rod is connected to an opening in the upper portion of the back-patting device body, the interior of the clamping rod is hollow, the clamping rod is connected witha handle body, the handle body is detachably connected with the clamping rod, the size of the opening, communicated with the outside, of an inner cavity of the back-patting device body can be adjusted, and impact of the back-patting device on a patient is reduced through buffering of the air bag, under the control of a two-way valve arranged on the air bag, the size of a negative pressure cavityduring slapping is effectiv