A microcontroller-based implantable telemetry system for sympathetic nerve activity and ECG measurement

Author

Enokawa, Chisato ; Yonezawa, Yoshiharu ; Maki, Hiromichi ; Aritomo, Mikio

Author_Institution

Dept. of Electron. Eng., Hiroshima Inst. of Technol., Japan

Volume

5

fYear

1997

fDate

1997

Firstpage

2232

Abstract

A passive implantable telemetry system employing a low power 8 bit microcontroller has been designed for chronic unanesthetized small animal studies. The implantable renal nerve activity and ECG system is powered by induction coupling. The gains of the neural signal (NS) and ECG amplifiers are microprocessor-controlled by on-off-keying of transmitted power modulated at 144 bps. Analog signals from the NS and ECG amplifiers are each converted to an 8-bit serial digital format. This is accomplished by two 8-bit A/D converters included in the single microcontroller. The converted binary code is applied to a passive RLC serial resonant circuit and transmitted by electromagnetic wave

Keywords

analogue-digital conversion; biomedical electronics; biomedical telemetry; computerised monitoring; electrocardiography; instrumentation amplifiers; medical signal processing; microcontrollers; neurophysiology; operational amplifiers; 144 bit/s; 8 bit; A/D converters; ECG amplifier gains; ECG measurement; chronic unanesthetized small animal studies; converted binary code; implantable renal nerve activity; induction coupling; instrumentation amplifiers; low power microcontroller; microcontroller-based implantable telemetry system; microprocessor-controlled; modulated transmitted power; neural signal gains; on-off-keying; op amp; passive RLC serial resonant circuit; passive implantable telemetry system; sympathetic nerve activity; Animals; Coils; Control systems; Electrocardiography; Electromagnetic coupling; Microcontrollers; Operational amplifiers; Power amplifiers; RLC circuits; Telemetry;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 1997. Proceedings of the 19th Annual International Conference of the IEEE

Conference_Location

Chicago, IL

ISSN

1094-687X

Print_ISBN

0-7803-4262-3

Type

conf

DOI

10.1109/IEMBS.1997.758803

Filename

758803