Device for injecting a controlled dose of solution, relative production method and kit

An injection kit for injecting a controlled dose of an injectable solution, including:

• an injection device (100), provided with a containment tubular body (3), that extends between one first end (31) and one second end (32);
• at least one containment chamber (33), defined inside the tubular body (3), for the containment of the injectable substance;
• a plunger (5) slidingly engaged inside the tubular body (3), provided with a central stem (53) placed between a cap (51) and a base (52), said cap (51) being slidingly arranged inside the containment chamber (33) to allow the outflow of the injectable substance;
• at least one spacer applicable to the plunger (5) and adapted to allow a forward movement of the plunger (5) in the containment chamber (33) up to reach an abutment of the spacer between the base (52) of the plunger (5) and the second end (32) of the containment chamber (3) to avoid the further forward movement of the plunger (5) in the containment chamber (33);
• characterized in that the spacer is a flexible dosing label (9), that can be deformed in one longitudinal direction (X) and rigid in one transverse direction (Y).