System for aiding placement of a nasogastric tube or a nasoduodenal tube and method for using the same

A system for aiding placement of a nasogastric tube or a nasoduodenal tube, comprising:

• a placing tube (1);
• a three-way connector (2) that has a first port (21), a second port (22) and a third port (23) with the first port (21) on the opposite end to the second port (22) and the third port (23) adjacent to the first port (21);
• wherein said first port (21) is connected with the proximal end of the placing tube (1) and the third port (23) designed for air/fluid injection;
• an endoscope (3) that has an insertion tube (31) and an image-capturing device (32) with the distal end of the insertion tube being a bending section (311) and the image-capturing device (32) being set at the front end of the bending section (311);
• and
• a display unit (4) that is connected to the endoscope (3);
• wherein the endoscope (3) is inserted into the second port (22) and then through the first port (21) of the three-way connector (2) to the distal end of the insertion tube (1), with the bending section (311) going out of the distal end of the placing tube (1);
• after the placing tube (1) is inserted into a natural tract of the human body, pump air or fluid into the natural tract via the third port (23) of the three-way connector (2) in order to inflate a cavity of the human body, if needed, thus the image-capturing device (32) capturing images in the natural tract, which are then instantaneously shown on the display unit (4), the placing tube (1) being placed into the target position by viewing the lumen images, after that, the endoscope (3) and the three-way connector (2) being removed from the placing tube (1).