Patent ID: 8439862

Claim:
A device for dispensing fluid to a patient and indicating a fluid flow condition, the device comprising: a reservoir configured to provide a source of fluid under pressure; a continuous flow path from the source providing a continuous and substantially constant flow rate of fluid, and wherein the continuous flow path is in fluid communication with the source of fluid; at least one pre-biased indicator in fluid communication with the continuous flow path, the at least one pre-biased indicator configured to provide a discrete visual signal that the pressure of the fluid in the continuous flow path is different from a predetermined level of pressure, thereby indicating a fluid flow condition; a bolus flow path for the delivery of a bolus dose of fluid; a large volume bolus delivery system in fluid communication with the bolus flow path and configured to receive fluid from the reservoir, the bolus delivery system being configured to elastically expand to pressurize fluid, store the pressurized fluid and dispense the pressurized fluid while avoiding bolus refill during bolus delivery or after bolus delivery but before it is enabled to elastically expand in a subsequent delivery cycle; and a patient operable actuator to release fluid from the bolus delivery system, the actuator being configured such that it does not require effort to force the fluid out of the bolus reservoir and that when actuated by the patient, fluid is permitted to flow out of the bolus reservoir to the patient without further action by the patient.