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Injector for applying fluids, especially contrast agents in X-ray and nuclear spin tomography

  • US 6,488,660 B1
  • Filed: 09/13/2000
  • Issued: 12/03/2002
  • Est. Priority Date: 01/13/1999
  • Status: Expired due to Term
First Claim
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1. 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.

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