Herein is described a device that makes it possible to use opened but unused contrast material safely for subsequent patients. During invasive angiographic procedures, fixed contrast bottles are used. These have fixed amounts of contrast in them, and very often when the bottles are not used completely, the excess goes to waste. The present device allows the unused portion to be used with the next patient. By using a large source of contrast, such as a bottle, with a docking unit, controlled amounts of contrast may be added to a patient line and then the extra contrast may be used for the next patient, with the use of a fresh receiver. The docking unit comprises a dosing unit and a receiver.
