Abstract: A medical liquid injection device is provided. The medical liquid injection device includes a base body, a needle assembly mounted on the base body, a reservoir fluidly connected to the needle assembly and having a guide groove on an inner surface, and a driving unit configured to move a plunger disposed inside the reservoir.

Abstract: Provided is a medical liquid injection device including a base body, a needle assembly mounted on the base body, a reservoir fluidly connected to the needle assembly and having an inner space in which a medical liquid is stored, a plunger disposed inside the reservoir, and configured to move in a longitudinal direction of the reservoir according to an amount of the medical liquid stored in the reservoir, and a first sensor unit configured to measure the amount of the medical liquid stored in the reservoir according to the movement of the plunger.

Abstract: A needle assembly and a medical liquid injection device are provided. The needle assembly includes a needle, a cannula into which the needle is inserted, a first holder supporting the needle, a sleeve in which the first holder is disposed in an inner space thereof, and a second holder supporting the cannula, disposed to face one side of the first holder, and having a first end and a second end extending outward, wherein at least one of the first end and the second end has an cutout part with a part removed by a preset length.

Abstract: A medical liquid injection device is provided. The medical liquid injection device includes a base body, a needle assembly mounted on the base body, a reservoir fluidly connected to the needle assembly and having a guide groove on an inner surface, and a driving unit configured to move a plunger disposed inside the reservoir.