Radio frequency controlled microvalve for biomedical applications

Don W. Dissanayake; Ajay C. Tikka; Said F. Al-Sarawi; Derek Abbott

doi:10.1117/12.695743

22 December 2006 Radio frequency controlled microvalve for biomedical applications

Don W. Dissanayake, Ajay C. Tikka, Said F. Al-Sarawi, Derek Abbott

Proceedings Volume 6413, Smart Materials IV; 64130D (2006) https://doi.org/10.1117/12.695743
Event: SPIE Smart Materials, Nano- and Micro-Smart Systems, 2006, Adelaide, Australia

Abstract

In this paper we propose the use of a RF controlled microvalve for implementation on a PZT substrate for biomedical applications. Such device has a huge range of applications such as parallel mixing of photo-lithographically defined nanolitre volumes, flow control in pneumatically driven microfluidic systems and lab-on-chip applications. The microvalve makes use of direct actuation mechanisms at the microscale level to allow its use in vivo applications. A number of acoustic propagation modes are investigated and their suitability for biomedical applications, in terms of the required displacement, device size and operation frequency. A theoretical model of the Surface Acoustic Wave (SAW) device is presented and its use in micro-valve application was evaluated using ANSYS tools. Furthermore, the wireless aspect of the device is considered through combining the RF antenna with the microvalve simulation by assuming a high carrier frequency with a small peak-to-peak signal. A new microvalve structure which uses a parallel type piezoelectric bimorph actuator was designed and simulated using ANSYS tools. Then, further optimization of the device was carried out to achieve a better coupling between electrical signal and mechanical actuation within the SAW device.

Citation Download Citation

Don W. Dissanayake, Ajay C. Tikka, Said F. Al-Sarawi, and Derek Abbott "Radio frequency controlled microvalve for biomedical applications", Proc. SPIE 6413, Smart Materials IV, 64130D (22 December 2006); https://doi.org/10.1117/12.695743

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