An Electromagnetic Catheter Blood Flow Meter of Minimal Lateral Dimensions

摘要: Abstract A method is described to reduce the lateral dimensions of an electromagnetic catheter blood flow meter maximum possible extent. To achieve this, magnetic field generated by a magnet placed outside subject. Thus, only electrodes and minimal supporting structure have be introduced into vessel pick up electromotive force induced in streaming at right angles field. suppress induction transformer electrode leads, latter form co-axial lead system small gauge. One tip insulated external tube this (a gauge no. 28 hypodermic tube) from it. The other bare section about 2 cm its tip. bent angle 30° just below second electrode. places two near diametrically opposite wall sections vessels after insertion fine via hollow through branch main vessel. rotated until plane containing perpendicular potential difference between measures volume rate This principle can used monitor major as well their branches. Catheter meters down 0.5 mm diameter thus been made much smaller ones without excessive difficulty.