The present invention relates to an apparatus and a system for controlling an amount of medicine or fluid injection through falling due to potential energy of the fluid, and more particularly to an apparatus in which a first box (10) having a first accommodating part (12) extending from one side toward an opposite side thereof and a second box (20) having a second accommodating part (22) extending together with the first accommodating part (22) to accommodate a chamber are hinge-coupled to each other such that one side surface of the first box (10) and one side surface of the second box (20) face each other when the first box (10) and the second box (20) are folded, a driving unit (30) controls a speed of a medicine dropping into the chamber by pressing an outer circumference of a hose (2) inserted into the gully, a detection unit (34) detects a movement of a medicine dropping into the chamber 1 accommodated in the first accommodating part (12) and the second accommodating part (22), a control unit (35) controls a speed of a dropping medicine by controlling the driving unit based on the information secured by the detection unit. The present invention relates to a heart stabilizer which can accurately and safely raise a beating heart, fix the heat while variously converting the direction of the heart, and firmly hold the heart while easily moving the heart according to a change of the operated part during an operation, when a coronary artery of the heat is operated.
