Analysis of PMN-PT and PZT circular diaphragm energy harvesters for use in implantable medical devices

Changki Mo; Leon J. Radziemski; William W. Clark

doi:10.1117/12.716663

27 April 2007 Analysis of PMN-PT and PZT circular diaphragm energy harvesters for use in implantable medical devices

Changki Mo, Leon J. Radziemski, William W. Clark

Proceedings Volume 6525, Active and Passive Smart Structures and Integrated Systems 2007; 652507 (2007) https://doi.org/10.1117/12.716663
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2007, San Diego, California, United States

Abstract

This paper presents current work on a project to demonstrate the feasibility of harvesting energy for medical devices from internal biomechanical forces using piezoelectric transducer technology based on PMN-PT. The energy harvesting device in this study is a partially covered, simply-supported PMN-PT unimorph circular plate to capture biomechanical energy and to provide power to implanted medical devices. Power harvesting performance for the piezoelectric energy harvesting diaphragm structure is examined analytically. The analysis includes comprehensive modeling and parametric study to provide a design primer for a specific application. An expression for the total power output from the devices for applied pressure is shown, and then used to determine optimal design parameters. It is shown that the device's deflections and stresses under load are the limiting factors in the design. While the primary material choice for energy harvesting today is PZT, an advanced material, PMN-PT, which exhibits improved potential over current materials, is used.

Citation Download Citation

Changki Mo, Leon J. Radziemski, and William W. Clark "Analysis of PMN-PT and PZT circular diaphragm energy harvesters for use in implantable medical devices", Proc. SPIE 6525, Active and Passive Smart Structures and Integrated Systems 2007, 652507 (27 April 2007); https://doi.org/10.1117/12.716663

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