Medical precise dose syringe for botulinum toxin

A precise dose syringe for medical botulinum toxin, comprising a barrel (1), a needle (2), a plunger (3), and a plunger handle (4), wherein the needle (2) is inserted and connected to a tip at a bottom of the barrel (1), the plunger (3) is located inside the barrel (1), the plunger handle (4) is fixedly connected to a top of the plunger (3), and the plunger handle (4) is located inside the barrel (1) and extends to a top of the barrel (1);

• a cross-section of the plunger handle (4) is square, a plurality of arc-shaped grooves (5) are provided on both sides of the plunger handle (4), and a front side of the plunger handle (4) is provided with a scale line (6);
• an outer side of the plunger handle (4) is sleeved with a reminder mechanism (7) and a quantitative mechanism (8), the reminder mechanism (7) is located inside the barrel (1) and extends out of the top of the barrel (1), and the quantitative mechanism (8) is located above the barrel (1);
• the quantitative mechanism (8) comprises a U-shaped sleeve block (18) and an I-shaped block (19), the I-shaped block (19) is located behind the U-shaped sleeve block (18) and extends to an inside of the U-shaped sleeve block (18), both side of the inside of the U-shaped sleeve block (18) are provided with an insertion slot (24) respectively, the I-shaped block (19) extends to an inside of the insertion slot (24), the U-shaped sleeve block (18) is sleeved at an outer end of the plunger handle (4), a top of the U-shaped sleeve block (18) is provided with an indicator arrow (23), the indicator arrow (23) is located in a front of the plunger handle (4), a back side of the I-shaped block (19) is connected to a thumb screw (20) through a thread connection, a front side of the thumb screw (20) is fixedly connected to a contact block (21), and a front side of the contact block (21) is in contact with a back side of the plunger handle (4);
• the reminder mechanism (7) comprises a first U-shaped seat (9) and a second U-shaped seat (10), wherein the first U-shaped seat (9) and the second U-shaped seat (10) are respectively sleeved on both sides of the plunger handle (4), outer sides of the first U-shaped seat (9) and the second U-shaped seat (10) are fixedly connected to a curved rubber block (15) respectively, an outer end of the curved rubber block (15) is in contact with an inner wall of the barrel (1), an inner wall of the first U-shaped seat (9) and an inner wall of the second U-shaped seat (10) are provided with a first slot (11) respectively, the first slot (11) is fixedly connected with an elastic piece (12), and a side of the elastic piece (12) near the plunger handle (4) extends to an interior of the adjacent arc-shaped groove (5);
• and
• a front side of the I-shaped block (19) is provided with a second slot (22), and the contact block (21) is located inside the second slot (22).