Multilayer out-of-plane overlap electrostatic energy harvesting structure actuated by blood pressure for powering intra-cardiac implants

13th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Deterre, M.^1,2 ; Risquez, S.^1 ; Bouthaud, B.^2 ; Molin, R Dal^2 ; Woytasik, M.^1 ; Lefeuvre, E.^1

Univ Paris-Sud-CNRS, Institut d'Electronique Fondamentale, rue Ampère, bat. 220, 91405 Orsay Cedex, France^1

Sorin CRM, Za Noveos, 4 avenue Reaumur, 92140 Clamart, France^2

关键词: Analytical and numerical models;    Capacitance variation;    Electrostatic energies;    Electrostatic transducers;    Mechanical excitations;    Medical implants;    Scavenging energy;    Very low frequency;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/476/1/012039/pdf
DOI  :  10.1088/1742-6596/476/1/012039

来源: IOP

【 摘 要 】

We present an innovative multilayer out-of-plane electrostatic energy harvesting device conceived in view of scavenging energy from regular blood pressure in the heart. This concept involves the use of a deformable packaging for the implant in order to transmit the blood pressure to the electrostatic transducer. As shown in previous work, this is possible by using thin metal micro-bellows structure, providing long term hermeticity and high flexibility. The design of the electrostatic device has overcome several challenges such as the very low frequency of the mechanical excitation (1 to 2 Hz) and the small available room in the medical implant. Analytical and numerical models have been used to maximize the capacitance variation, and hence to optimize the energy conversion. We have theoretically shown that a 25-layer transducer with 6-mm diameter and 1-mm thickness could harvest at least 20 mJ per heart beat in the left ventricle under a maximum voltage of 75 V. These results show that the proposed concept is promising and could power the next generation of leadless pacemakers.