An apparatus for dispensing a volume during intraosseous infusion, the apparatus comprising: a base configured to be coupled to a syringe having a body defining a reservoir and plunger slidably coupled to the body; an arm coupled to the base , wherein a portion of the arm is movable between an extended position and a contracted position in which the portion of the arm is closer to the base than in the extended position; a resilient member coupled to base and to the arm , wherein the resilient member is configured to bias the portion of the arm toward the contracted position relative to the base with a force sufficient to depress a plunger of a syringe coupled to the base; and a damper configured to resist movement of the portion of the arm from the extended position toward the contracted position to control a rate at which the resilient member can move the portion of the arm from the extended position toward the contracted position; where the base defines a channel configured to prevent movement of the syringe along a length of the base as the plunger is depressed, and the base includes one or more incremental stops , each of the one or more incremental stops being configured to limit a distance by which the portion of the arm is operable to compress the plunger , where the arm includes a tab configured to contact the plunger and depress the plunger as the portion of the arm is moved towards the contracted position, where the resilient member includes a spring configured to exert a first force on the arm , and where the damper includes a piston configured to exert a second force on the arm that opposes the first force. a base configured to be coupled to a syringe having a body defining a reservoir and plunger slidably coupled to the body; an arm coupled to the base , wherein a portion of the arm is movable between an extended position and a contracted position in which the portion of the arm is closer to the base than in the extended position; a resilient member coupled to base and to the arm , wherein the resilient member is configured to bias the portion of the arm toward the contracted position relative to the base with a force sufficient to depress a plunger of a syringe coupled to the base; and a damper configured to resist movement of the portion of the arm from the extended position toward the contracted position to control a rate at which the resilient member can move the portion of the arm from the extended position toward the contracted position; where the base defines a channel configured to prevent movement of the syringe along a length of the base as the plunger is depressed, and the base includes one or more incremental stops , each of the one or more incremental stops being configured to limit a distance by which the portion of the arm is operable to compress the plunger , where the arm includes a tab configured to contact the plunger and depress the plunger as the portion of the arm is moved towards the contracted position, where the resilient member includes a spring configured to exert a first force on the arm , and where the damper includes a piston configured to exert a second force on the arm that opposes the first force. <EOS>