An apparatus for measuring electrical activity in the heart, such as an ECG apparatus, has an input amplifier with multiple inputs to which the respective poles of electrodes introduced into a patient are intended to be connected. The input amplifier includes a sensing stage for sensing the impedance...http://www.google.es/patents/US5469857?utm_source=gb-gplus-sharePatente US5469857 - Apparatus for measuring electrical activity in the heart with graphical display of electrode contact with tissue
Apparatus for measuring electrical activity in the heart with graphical ...
