Patent ID: 7556619

Claim:
An injector system comprising: a source of injection fluid; a pump device; a fluid path set in fluid connection with the source of injection fluid and the pump device, and comprising a multi-position valve; an air detector assembly operatively engaged with a portion of the fluid path set and adapted to detect the presence of air in the fluid path set; a fluid control device operatively associated with the multi-position valve of the fluid path set and disposed downstream of the pump device, the fluid control device comprising a valve actuator to automatically operate the multi-position valve, the valve actuator comprising a sensor indicating the presence of the multi-position valve in the valve actuator and adapted to close the multi-position valve to isolate the pump device and fluid flow from a patient and stop flow of the injection fluid to the patient at substantially any pressure or flow rate generated by the pump device for delivering a sharp bolus of the injection fluid to the patient; a drip chamber in fluid communication with the fluid path set, the drip chamber comprising an elongated body having a top end, a bottom end and a raised projection, the raised projection being substantially rectangular in shape and extending longitudinally from the top end along the drip chamber body and terminating adjacent to the bottom end; and a fluid level sensing mechanism operably associated with the fluid control device, the fluid level sensing mechanism comprising: a drip chamber support for supporting the drip chamber body; and a fluid level sensor comprising an ultrasonic or an optical sensor associated with the drip chamber support, the drip chamber support adapted to support the drip chamber body such that the raised projection is in operational contact with the fluid level sensor and the fluid level sensing mechanism is operable to transmit ultrasonic or light energy through the raised projection to be sensed by the fluid level sensor for sensing the injection fluid level in the drip chamber.