Pressure difference measuring instrument for portal-body venous systems

The utility model belongs to the field of medical appliances, relates to a pressure difference measuring instrument for portal-body venous systems, which is used during a hepatobiliary surgery. The pressure difference of the portal-body venous systems is usually needed to be measured during the hepatobiliary surgery, but the special clinical pressure difference measuring instrument for the portal-body venous systems does not exist at present, the utility model adopts two single lumen catheters which have the same caliber and use a common calibrated scale to be respectively connected with the portal vein and the body vein, wherein a stay cord is arranged at the head part of the single lumen catheter, a gravity cone is arranged at the lower end thereof, and the two catheters can be kept in a vertical state by being hung on an infusion support or directly lifted by hand. In the vertical state, the difference of the liquid levels in the left and the right single lumen catheters is just the pressure difference of the portal-body venous systems. The utility model can not only measure the pressure of the portal venous system but also the pressure of the body venous system simultaneously, meanwhile, the reading is accurate, and the repeatability is good. The utility model has easy machining and manufacturing, low cost, strong practicability and wide market prospect.