Patent ID: 6488660
Filing Date: 2002-12-03
Classification: A61M

Abstract:
An injector for supplying a liquid to a patient, comprising:a plurality of storage vessels; a tube system connecting said vessels with a cannula, said tube system comprising: respective connection tubes each connected to one of said vessels, a pump tube connected with said cannula, and a branching piece between said pump tube and said connection tubes; a respective gas bubble detector for each connection tube responsive to movement of a gas bubble from the respective storage vessel into the respective connection tube; a respective valve for each connection tube selectively operable to block and unblock liquid movement through the respective connection tube; and a pumping organ along said pump tube for reversing flow of liquid along said pump tube to drive a gas bubble back into a respective storage vessel, said pumping organ having a correcting element lying against said pump tube for deflecting a wall of said pump tube to drive liquid therein in an upstream direction.