A
syringe may be pre-filled with fluid and connected to a
rapid infusion attachment to deliver a rapid bolus of fluid to a patient. The
rapid infusion attachment may comprise a spring that, when compressed, provides a
spring force to the
plunger of the
syringe. The device comprising the
syringe and the
rapid infusion attachment may be shipped and stored such that the syringe is pre-filled and the spring is pre-loaded, or compressed. The device may also be shipped and stored with the spring uncompressed, and a clinician or other user may compress the spring prior to attaching the device to an IV set or other fluid pathway. The device may further comprise a mechanism that allow the clinician to control the fluid flow. The device may also further comprise a
locking mechanism that can be released when the fluid in the syringe is to be injected.