Ultrasonic microheaters using piezo-ceramics for cauterization and other applications

Karthik Visvanathan, Yogesh B. Gianchandani
2009 TRANSDUCERS 2009 - 2009 International Solid-State Sensors, Actuators and Microsystems Conference  
This paper presents the use of piezoelectric ultrasonic microheaters for cauterization of biological tissues for tumor ablation and hemostasis. Ultrasonic heaters using PZT-5A ceramic of 3.2 mm diameter and 191 µm thickness were used in the experiments. A finite element model was developed to predict the heat generated by these microheaters. The ultrasonic heaters attained maximum temperature and thermal efficiency at frequency corresponding to maximum conductance and maximum impedance
more » ... impedance respectively. The thermal efficiency at each resonance frequency (0.5-3 MHz) was proportional to effective coupling factor (0.25-0.5) at that mode. The thermal efficiency is 930°C/W for biological tissue. Stacked heaters provide about three times higher efficiency. Branding of porcine tissue using the proposed device is also discussed.
doi:10.1109/sensor.2009.5285433 fatcat:ntmnp22asfbxblruiyyoc4z2vu