Dual-mode operation of flexible piezoelectric polymer diaphragm for intracranial pressure measurement

Chunyan Li; Pei-Ming Wu; Shutter, Lori A.; Narayan, Raj K.
February 2010
Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p053502
Academic Journal
The dual-mode operation of a polyvinylidene fluoride trifluoroethylene (PVDF-TrFE) piezoelectric polymer diaphragm, in a capacitive or resonant mode, is reported as a flexible intracranial pressure (ICP) sensor. The pressure sensor using a capacitive mode exhibits a higher linearity and less power consumption than resonant mode operated pressure sensor. In contrast, the latter provides better sensitivity and easier adaption for wireless application. The metrological properties of the dual-mode ICP sensor being described are satisfactory in vitro. We propose that the piezoelectric polymer diaphragm has a promising future in intracranial pressure monitoring.


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