Relates to a method of determining the position of a catheter introduced along a guide wire inserted into the body, the present invention, the imaging method is an image of a region of the body in the region of the guide wire and the guide wire in this method is captured, the distance catheter is passed over the guide wire is advanced is measured, the position of the catheter in the body is determined based on the measured distance. The present invention is related to a device for determining the position of a catheter introduced along a guide wire to be inserted into the body, the device measures the distance that the catheter is threaded over the guide wire is advanced includes sensor means for, and means for determining the position of the catheter on the basis of the measured distance.
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