Abstract: Provided is an ultrasonic surgical knife blade. The projection of the blade on a shear plane is banana-like curved shape. From a proximal end to a distal end, the thickness of the blade varies from thick to thin, and then to thick and to thin again. The projection on a vertical shear plane is fruit knife-shaped. The height of the blade varies from high to low, and then gradually decreases, and an arc-shaped cutting groove is formed in the middle position. The present invention allows for an increase of swing amplitude in the bending direction and the effective working length of the blade. A boat-shaped or arc-shaped balance cutting groove is provided between the most distant node and a tip of the blade, such that the stability of ultrasonic vibration is improved.

Abstract: An apparatus and method for purification and recovery of an organic liquid. The apparatus includes a distillation kettle and a receiver tank connected by a distillation pipe, and a vacuum pump, wherein a vacuum storage tank is arranged between the receiver tank and the vacuum pump; the vacuum storage tank is connected to the receiver tank by a vacuum regulating pipe, a first vacuum regulating valve being arranged on the vacuum regulating pipe; and the vacuum storage tank is connected to the vacuum pump by an evacuation pipe, a second vacuum regulating valve being arranged on the evacuation pipe. By arranging a vacuum storage tank between the receiver tank and the vacuum pump, the vacuum degree in the receiver tank is regulated by the vacuum storage tank, such that the organic liquid is recovered in a sealed environment under reduced pressure.