US Patent 7291131 Infusion syringe

A syringe configured for communication with a tubular member insertable into the body of a subject includes a pressure transducer integrally mounted in the plunger thereof, under a tip of the plunger, such that the force applied by the plunger to fluid within a barrel of the syringe is transmitted to the transducer. A resulting electronic signal is converted to a display value for aiding a physician.