a device for transferring liquid between the body of a patient and a syringe includes a syringe barrel defining a bore a plunger that may slide through the bore to force liquid into or out of the bore and a pump capable of sliding the plunger the pump housing positively connects to the bore by sliding a protrusion formed on the exterior of the pump housing into an indentation formed within the interior surface of the bore application_number US 59588196 A description with reference to fig1 and fig1 b the fluid injection device 10 includes a syringe barrel 20 with a distal end and a proximal end with a bore 23 formed therein extending from the distal to the proximal end an opening 21 in the distal end of the bore 23 provides fluid communication between the bore 23 and the exterior of the syringe barrel 20 preferably the syringe barrel contains a tapered section 22 where the cross section is reduced near the opening 21 the bore 23 is thus also reduced in cross section near the opening 21 a needle catheter or other fluid transfer device not shown may be fitted onto the opening 21 to transfer fluid between the body of a patient and the bore 23 of the device 10 a pump housing 40 attaches to the proximal end of the syringe barrel 20 the pump housing contains a plunger 50 attached to a plunger rod 52 and drive means to advance and retract the plunger 50 through the bore 23 the plunger 50 is preferably elastomeric and is dimensioned so that it.