At least one isocyanate-reactive monomer is reacted with an excess of molten monomeric diisocynate to produce at least one reaction product and a maximum of 0. The power blade includes a bus extending along a longitudinal axis, and a plurality of individual electrical contacts extending from the bus such that the electrical contacts are each electrically connected to the bus. The apparatus includes elements for pivoting the sensor by 90\xb0 to extend it in a direction parallel to the plane P, switching the generator provided with the collimation slit from the first mode to a second mode of operation to produce an X-ray beam elongated parallel to the direction of the sensor, so that the these positioned sensor is always in correspondence with the beam. By employing a three capacitor shocking circuit configured as described herein, the amount of energy required to reach a myocardial defibrillation threshold is less than for one-capacitor or two-capacitor systems, regardless of the total capacitance of the system.