A device for controlling the delivery of a fluid from a fluid source to a patient, the device comprising: a first flow path between the fluid source and the patient, the first flow path for delivering fluid from the fluid source to the patient at a basal rate of flow; a second flow path between the fluid source and the patient, the second flow path including: a bolus reservoir; a bolus valve disposed between the bolus reservoir and the patient; and a first branch in which the fluid source is in fluid communication with the bolus reservoir and the bolus valve; characterized in that the first branch includes a branch restrictor tube dimensioned to allow fluid flow at a bolus filling rate; said second flow path further includes: a second branch in which the fluid source is in fluid communication with a branch valve, the bolus reservoir and the bolus valve; and said device further includes: an actuator that is operable to place the device in the following modes: a priming mode in which the bolus valve and the branch valve are open and fluid flows through the first flow path, the first branch of the second flow path, and the second branch of the second flow path; a fill mode in which the bolus valve is closed and the branch valve is open and fluid flows from the fluid source to the bolus reservoir via the second branch of the second flow path; and a standby mode in which the bolus valve and the branch valve are closed and fluid flows between the fluid source and the patient via the first flow path. a first flow path between the fluid source and the patient, the first flow path for delivering fluid from the fluid source to the patient at a basal rate of flow; a second flow path between the fluid source and the patient, the second flow path including: a bolus reservoir; a bolus valve disposed between the bolus reservoir and the patient; and a first branch in which the fluid source is in fluid communication with the bolus reservoir and the bolus valve; a bolus reservoir; a bolus valve disposed between the bolus reservoir and the patient; and a first branch in which the fluid source is in fluid communication with the bolus reservoir and the bolus valve; the first branch includes a branch restrictor tube dimensioned to allow fluid flow at a bolus filling rate; said second flow path further includes: a second branch in which the fluid source is in fluid communication with a branch valve, the bolus reservoir and the bolus valve; and said device further includes: an actuator that is operable to place the device in the following modes: a priming mode in which the bolus valve and the branch valve are open and fluid flows through the first flow path, the first branch of the second flow path, and the second branch of the second flow path; a fill mode in which the bolus valve is closed and the branch valve is open and fluid flows from the fluid source to the bolus reservoir via the second branch of the second flow path; and a standby mode in which the bolus valve and the branch valve are closed and fluid flows between the fluid source and the patient via the first flow path. a second branch in which the fluid source is in fluid communication with a branch valve, the bolus reservoir and the bolus valve; and said device further includes: an actuator that is operable to place the device in the following modes: a priming mode in which the bolus valve and the branch valve are open and fluid flows through the first flow path, the first branch of the second flow path, and the second branch of the second flow path; a fill mode in which the bolus valve is closed and the branch valve is open and fluid flows from the fluid source to the bolus reservoir via the second branch of the second flow path; and a standby mode in which the bolus valve and the branch valve are closed and fluid flows between the fluid source and the patient via the first flow path. an actuator that is operable to place the device in the following modes: a priming mode in which the bolus valve and the branch valve are open and fluid flows through the first flow path, the first branch of the second flow path, and the second branch of the second flow path; a fill mode in which the bolus valve is closed and the branch valve is open and fluid flows from the fluid source to the bolus reservoir via the second branch of the second flow path; and a standby mode in which the bolus valve and the branch valve are closed and fluid flows between the fluid source and the patient via the first flow path. a priming mode in which the bolus valve and the branch valve are open and fluid flows through the first flow path, the first branch of the second flow path, and the second branch of the second flow path; a fill mode in which the bolus valve is closed and the branch valve is open and fluid flows from the fluid source to the bolus reservoir via the second branch of the second flow path; and a standby mode in which the bolus valve and the branch valve are closed and fluid flows between the fluid source and the patient via the first flow path.