A dual port syringe has an upper port for connection to a fluid reservoir and a lower port for delivery of the medical fluid under pressure to a patient. A first valve is connected between the fluid reservoir and the upper port, and second valve is connected between the lower port and the patient. During...http://www.google.com.au/patents/US6099502?utm_source=gb-gplus-sharePatent US6099502 - Dual port syringe
