Title :
A miniaturised radio telemetry two channel ultrasonic cardiac dimension gauge
Author :
Yonezawa, Yoshiharu ; Caldwel, W. Morton
Author_Institution :
Dept. of Electr. Eng., Hiroshima Inst. of Technol., Japan
Abstract :
A two-channel ultrasonic cardiac dimension gauge telemetry system developed for chronic unanesthetized animal studies is described. The system consists of dual ultrasonic transit time distance measurement circuits and a time-multiplexed FM transmitter. The system employs implantable 5-MHz lead zirconate titanate piezoelectric transmitting and receiving crystals for measurements at 2-22.5 mm. The system is designed with six standard low power ICs and three transistors. Power consumption is 40.8 mW (6.8 mA, 6 V). The 35-cm3 circuit weighs 40 gms
Keywords :
biological techniques and instruments; cardiology; telemetering equipment; ultrasonic equipment; 2 to 22.5 mm; 40.8 mW; 5 MHz; 6 V; 6.8 mA; chronic unanesthetized animal studies; dual ultrasonic transit time distance measurement circuits; implantable device; low power ICs; piezoelectric crystals; power consumption; time-multiplexed FM transmitter; transistors; two-channel US cardiac dimension gauge telemetry system; Biomedical measurements; Circuits; Crystals; Demodulation; Detectors; Frequency conversion; Linearity; Telemetry; Voltage; Voltage-controlled oscillators;
Conference_Titel :
Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in
Conference_Location :
Seattle, WA
DOI :
10.1109/IEMBS.1989.96283
