Constant force syringe

A syringe system comprising:

• a syringe body comprising a hollow lumen and a distal end, the syringe body being configured to house a fluid therein;
• a vacuum chamber at least partially disposed within the hollow lumen of the syringe body;
• a first plunger disposed distally to the vacuum chamber within the hollow lumen of the syringe body, the first plunger forming a seal against an inner surface of the syringe body and defining a fluid delivery volume between the first plunger and the distal end of the syringe body;
• a second plunger disposed within the vacuum chamber, the second plunger defining a proximal volume compartment and a distal volume compartment within the vacuum chamber;
• and
• a piston extending distally out of the vacuum chamber and connected to the first plunger and the second plunger, the piston configured to move the second plunger within the vacuum chamber and the first plunger within the syringe body.

A syringe system comprising:

• a syringe body comprising a hollow lumen and a distal end having a tip, the syringe body being configured to house a fluid therein;
• a vacuum chamber at least partially disposed within the hollow lumen of the syringe body;
• a first plunger disposed distally to the vacuum chamber within the hollow lumen of the syringe body, the first plunger forming a seal against an inner surface of the syringe body and defining a fluid delivery volume between the first plunger and the distal end of the syringe body;
• a second plunger disposed within the vacuum chamber, the second plunger defining a proximal volume compartment and a distal volume compartment within the vacuum chamber;
• a piston extending distally out of the vacuum chamber and connected to the first plunger and the second plunger, wherein the piston is configured to move the second plunger within the vacuum chamber and the first plunger within the syringe body;
• and
• a thumb piece removably attached to a proximal portion of the vacuum chamber, wherein the thumb piece is configured to provide a surface for a user to apply a force in a substantially distal direction, and wherein the thumb piece is further configured to increase and decrease a volume of the proximal volume compartment.