Injector for applying fluids, especially contrast agents in X-ray and nuclear spin tomography
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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Abstract
The injector according to the invention serves for applying contrast media for X-ray and nuclear spin tomography and has a tube system (5) consisting of connection tubes (6) and a pump tube (7), as well as several storage vessels (4), each connected via one of the connection tubes (6) as well as a branching piece (8) to a pump tube (7) leading to a cannula. To each connection tube (6) a gas bubble detector (15) as well as a valve (11) are assigned, whereby further to the pump tube (7) a pumping organ (16) reversing the fluid flow from the storage vessel (4) to the cannula is assigned.
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Citations
14 Claims
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1. An injector for supplying a liquid to a patient, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An injector for supplying a liquid to a patient, comprising:
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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;
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;
a pressure chamber integrated in said connection tube and communicating with said pump tube through at least one opening in a wall of said pump tube and adapted to be filled with liquid from said pump tube; and
a component in said pressure chamber adjustable by fluid pressure therein and acting upon a pressure sensor. - View Dependent Claims (11, 12, 13, 14)
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Specification