Aspiration and injection devices

A system for injecting a fluid, the system comprising:

• a manifold, wherein the manifold comprises a selection channel and a function selection piston in the selection channel that is configured to move within the selection channel;
• a plurality of check valves in the manifold;
• a first piston chamber fluidically connected to the selection channel and in fluid communication with a reservoir port;
• a second piston chamber fluidically connected to the selection channel in fluid communication with the reservoir port;
• a delivery port fluidically connected to the selection channel;
• and
• an actuation control configured to drive the function selection piston within the selection channel so that, at a start of an actuation of the actuation control, the function selection piston causes aspiration into the selection channel from the delivery port, further wherein continuing the actuation of the actuation control moves the function selection piston so that the first piston chamber and the second piston chamber are in fluid communication with the delivery port, so that fluid is pumped out of the delivery port from the first piston chamber and the second piston chamber.