Balloon infuser

A balloon infuser comprising:

• an upper cover (10) in which a scale mark (13) including linear scales is displayed;
• a lower cover (20) fixed to a lower side of the upper cover (10);
• a flexible expandable member (70) located inside the upper cover (10) and in which contents are accommodated;
• an elevation part (30) elevated according to an expansion degree of the expandable member (70) and having a scale indication line (34) on one surface thereof, the scale indication line (34) indicating the scale mark (13);
• an upper connector holder (40) coupled to an upper elevation part opening (31) located on an upper side of the elevation part (30);
• an upper connector (50) coupled to the upper connector holder (40);
• an inner shaft (60) coupled to the upper connector (50);
• a lower connector holder (100) coupled to a lower opening (21) of the lower cover (20);
• a lower connector (90) coupled to the lower connector holder (100);
• and
• an outer shaft (80) coupled to the lower connector (90);
• wherein the expandable member (70) covers the inner shaft (60) such that the inner shaft (60) is sealed, and
• wherein a hollow part (88) is located in the outer shaft (80), and the inner shaft (60) is inserted into the hollow part (88) to be elevated through a slide movement.