Syringe with visual indicator and retaining elements

A syringe with a visual indicator and retaining elements, for use in the application of epidural anesthesia, which is a syringe comprising a needle (1);

• a transparent barrel (2) housing the fluid to be applied in the epidural area;
• a front pivot (3) securing the junction between the needle and the barrel;
• a plunger (4) moving axially within the barrel;
• an outer plunger support (5) with which the anesthesiologist can move the plunger with his/her hand;
• and an outer reinforcement (6) of the barrel, preventing the plunger from separating from the cylinder/barrel;
• characterized in that the syringe also comprises the following:
• a visual indicator (7) located at the front end of the plunger (4), pushing the fluid contained in the barrel (2), which is a bellows-shaped element comprising two disks (70) with a membrane (71) between both disks, wherein the membrane (71) is deformable according to the pressure at which the syringe is located;
• at least one longitudinal side flap (41) in the plunger body (4), having a surface with a number of teeth (42), and wherein the plunger (4) is rotatable relative to its axial axis;
• inner hooks (81) in the barrel (2);
• and wherein the teeth (42) of the side fins (41) of the plunger fit into the hooks (81) retaining the position of the plunger (4), and are released by rotating the plunger (4).