| 摘要 |
<p>Myocardial electrodes perform two functions: sending electrical impulses to the cardiac muscle and collecting the natural cardiac signal to adjust the impulses. For the sending of the impulses to be as good as possible, the electrode must be small in size, whereas to have good collection, the electrode must, on the contrary, be extremely large. To reconcile these two contradictory requirements, the electrode has a dish (1) on which separate conductor elements (6), situated away from the surface of the dish, being either raised as shown or recessed, are arranged. These elements (6) have the shape of an exponential spiral in order to benefit from the characteristic of this spiral according to which its entropy is zero. This assembly enables the lines of force of the magnetic field emanating from the elements (6) to be concentrated according to a space situated beyond the rim (7), that is to say at the place where the part of the heart which has to receive the impulses is to be situated. The flared shape of the dish (1) gives the electrode the size necessary for good collection. <IMAGE></p> |
