Title :
Biocompatible circuit-breaker chip for temperature regulation of electrothermally driven smart implants
Author :
Luo, Yi ; Dahmardeh, Masoud ; Takahata, Kenichi
Author_Institution :
Univ. of British Columbia, Vancouver, BC, Canada
Abstract :
This paper presents a thermoresponsive micro circuit breaker for biomedical applications specifically targeted at implantable microsystems. The circuit breaker is micromachined to have a shape-memory-alloy cantilever actuator as a normally closed temperature-sensitive switch to protect the device of interest from overheating, a critical safety feature for smart implants including those that are electrothermally driven. The micro breaker is constructed using biocompatible materials in a form of 1.5×2.0×0.46 mm3 Ti-packaged chip and exhibits a cold-state resistance of 14 Ω. The chip functionality is tested in combination with a wireless resonant heater powered by radio-frequency electromagnetic radiation, demonstrating self-regulation of heater temperature. The developed breaker chip operates in a fully passive manner, contributing to the miniaturization of smart implants in which thermal management is essential.
Keywords :
biothermics; cantilevers; integrated circuits; microactuators; prosthetic power supplies; biocompatible circuit-breaker chip; biocompatible materials; critical safety feature; electrothermally driven smart implants; heater temperature self-regulation; implantable microsystems; radiofrequency electromagnetic radiation; shape-memory-alloy cantilever actuator; smart implant miniaturization; temperature-sensitive switch; thermal management; thermoresponsive microcircuit breaker; titanium-packaged chip; wireless resonant heater; Circuit breakers; Heating; Implants; Polyimides; Radio frequency; Temperature measurement; Wireless communication;
Conference_Titel :
Micro Electro Mechanical Systems (MEMS), 2015 28th IEEE International Conference on
Conference_Location :
Estoril
DOI :
10.1109/MEMSYS.2015.7051140
