Abstract: A cell culture device comprises a top layer, a diffusion layer, and a suspension layer. The diffusion layer comprises at least one diffusion channel. The suspension layer comprises multiple suspension units. The multiple suspension units are connected to the diffusion channel. A fluid is conducted through the diffusion channel and flow into the suspension units for drop suspended. Cells are cultivated in the fluid suspended in the suspension unit. The cell culture device can be used in an electromagnetic cell culturing system. The electromagnetic cell culturing system is a combination of hanging drop method, microfluidic technology and electromagnetic stimulation. The electromagnetic cell culturing system can improve the growth of cells and also is capable of continuously providing culture medium into the cell culture device. The cell culture device can be used to cultivate large quantity of cells with high productivity and stable quality.

Abstract: The present disclosure discloses a nasogastric tube used to insert into a patient's body from nose to stomach. The patient's body from nose to stomach comprises a posterior pharyngeal wall, an inferior conch, a nasopharynx rear-upper wall, and a soft palate; the nasogastric tube comprises a tube body and a pressurized structure. The tube body has a longitudinal direction and includes a proximal end and a distal end. A distance is between and the posterior pharyngeal wall. The pressurized structure is disposed on the tube body along the longitudinal direction and near the distal end. The pressurized structure comprises a cavity. When a fluid is filled into the cavity, the pressurized structure is pressurized; and the distal end is lifted to reduce the distance to the posterior pharyngeal wall.