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A Bessel transducer is constructed based on a ceramic with two external electrodes and an internal structure of alternated active and inactive annular piezoelectric zones. This type of transducers allows obtaining a good relationship between the depth of field and the lateral resolution of the acoustic field. This behavior of the acoustic field becomes the Bessel transducers in appropriate devices...
The partum is the most frequency cause for hospital entry. The recording of fetal well-being is a subject which has to be retaken since the present probes isn't sensible and the technology in US field don't change in the last 30th years. We had analyzed the cardiotocographic recording results in a sample of 250 pregnant women who came to our hospital delivery unit. The results show a 40% of sensibility...
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