CENTRAL VENOUS LINE INSERTION MONITORING SYSTEM

摘要

A catheter insertion monitor comprises a signal generator for generating a patient safe electrical signal at a first frequency higher than IkHz. This signal is fed into a human or animal body via a catheter and a return electrode. The catheter insertion monitor further has an amplifier for measuring electrical signals from the at least one signal generator by at least two sensor electrodes attached to the body. A processing unit generates a catheter position indicating signal by demodulating the signal from the amplifier of the first frequency and further generating an,,strength of cardiac modulation" (SCM) signal being the peak to peak value of this demodulated signal which has a low frequency modulation caused by the cardiac cycle. The SCM signal has a maximum when the catheter is close to the cavo-atrial junction.