Low-profile multi-agent injection system and methods

A fluid injection system comprising:

• an elongate member having a proximal end and a distal end and comprising an inner wall defining a lumen therein;
• a plurality of fluid delivery members disposed within the lumen of the elongate member and having a retracted configuration and an extended configuration, wherein the plurality of fluid delivery members are configured to extend out of the distal end of the elongate member in the extended configuration;
• wherein each of the plurality of fluid delivery members comprises a distal end, a proximal end, an outlet port at the distal end, and an inner wall defining a fluid delivery lumen therein, the fluid delivery lumen being fluidly coupled to the outlet port,
• wherein each of the fluid delivery lumens is fluidly independent of every other fluid delivery lumen of the plurality of fluid delivery members,
• a plurality of fluid delivery channels, wherein each of the plurality of fluid delivery channels is fluidly coupled to one or more fluid delivery lumens of the plurality of fluid delivery members;
• and
• a fluid delivery mechanism operably coupled to the plurality of fluid delivery channels, wherein actuation of the fluid delivery mechanism causes fluid to pass from the plurality of fluid delivery channels to the plurality of fluid delivery members and out of the outlet ports.