Verfahren und Gerät zum Anpassen der Fühlerlänge eines Impedanzmesskatheters an eine ventrikuläre Kammer
An apparatus and method for matching the distance spanned by a plurality of surface electrodes on an impedance measuring catheter to the size of a ventricular chamber to be measured is disclosed. The catheter (18) includes a plurality of longitudinally spaced electrodes (A-L) extending from its dist...
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Zusammenfassung: | An apparatus and method for matching the distance spanned by a plurality of surface electrodes on an impedance measuring catheter to the size of a ventricular chamber to be measured is disclosed. The catheter (18) includes a plurality of longitudinally spaced electrodes (A-L) extending from its distal end (20) and spanning a distance known to be greater than the maximum length of a ventricular chamber. With the distal end of the catheter located at the apex of the ventricle, an AC drive signal is applied between the distal electrode and a proximal electrode known to be outside of the ventricle. By then sensing the resulting voltage between successive adjacent electrode pairs and comparing same, the pair where a different characteristic is exhibited is known to be at the transition between the ventricle and the atrium. |
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