Non-invasive piezoelectric transducer for recording of respiration at the level of diaphragm

In this study, piezoelectric polyvinylidenefluoride (PVDF) wire was used in construction of a transducer for recording of respiration. The recordings have been performed in 202 subjects, mainly during normal routine electroencephalography (EEG) examinations. Comparison of the PVDF wire transducer with the piezoelectric Siemens Movement Sensor 230 was performed. The recordings of respiration showed highly similar curves with both methods. The PVDF wire transducer seems to record the breathing movements at the level of the diaphragm with great reliability in EEG-polygraphy and it is inexpensive, easy to use and to clean.