Device for intraocular fluid injection

A medical instrument, comprising:

• an elongate tubular housing having a distal end and a proximal end;
• a tool section coupled to the distal end of the housing;
• an interior cavity disposed in the housing;
• a piston disposed in the interior cavity;
• a button coupled to the piston and disposed on the housing, wherein the button is configured to actuate the piston for pumping fluid through the housing;
• a fluid connector disposed at the proximal end of the housing;
• a fluid entry chamber disposed in the interior cavity on a proximal side of the piston;
• a fluid entry valve disposed on a proximal side of the fluid entry chamber, the fluid entry valve comprising a one-way valve that permits fluid flow to the fluid entry chamber from the fluid connector and prevents fluid flow out of the fluid entry chamber to the fluid connector;
• a fluid exit chamber disposed in the interior cavity on a distal side of the piston;
• a fluid exit valve disposed on a distal side of the fluid exit chamber;
• and
• a fluidic channel extending through the piston between a distal side of the fluid entry chamber and a proximal side of the fluid exit chamber, wherein the fluidic channel is segmented into a plurality of sub-channels, wherein each of the sub-channels terminates in a piston valve, wherein fluid exiting a first one of the sub-channels is configured to feed into a second one of the sub-channels.