The objective of this work is to characterize the nonlinear dependence piezoelectric d15 shear coefficient a composite actuator on static electric field and include effect in finite element (FE) simulations. Levenberg-Marquardt least squares optimization algorithm implemented MATLAB was applied acquire parameters. constant integrated with piezoceramic patches obtained be 732 pC/N at 198 V. expe...

This paper presents an ultrasonic transducer modeling with VHDL-AMS standard (Very High speed integrated circuits Hardware Description Language – Analog and Mixed Signal) referenced IEEE 1076.1, integrated in a global measurement cell modeling dedicated to biological tissues ultrasound characterization. Usual modeling of ultrasonic transducer are based on electrical analogy and are not simulate...

PURPOSE To evaluate the safety and efficacy of the ultrasonic circular cyclo-coagulation procedure using high-intensity focused ultrasound by a miniaturized annular device containing 6 piezoceramic transducers in patients with refractory glaucoma. METHODS This was a prospective interventional noncomparative study of 20 eyes of 20 patients with refractory glaucoma. All eyes were treated with 6...