Stomach retention extraction device

The utility model provides a gastric retention extraction device. The gastric retention extraction device comprises a catheter, a collection bag and an injector, one end of the catheter is provided with a connector used for being connected with a stomach tube, and the other end of the catheter is communicated with the collecting bag in a sealed mode. The injector is connected to the middle of the catheter through a three-way valve, the three-way valve is provided with three connectors including a first connector, a second connector and a third connector, the first connector and the second connector are located on the same straight line and connected to the catheter, and the injector is connected to the third connector; when the first connector communicates with the third connector, a first conduction channel is defined in the three-way valve, and when the third connector communicates with the second connector, a second conduction channel is defined in the three-way valve. According to the gastric retention ex