Title :
A Low-Power Combination Electrocardiogram-Respiration Telemetry Transmitter
Author :
Beerwinkle, Kenneth R. ; Burch, John J.
Author_Institution :
Veterinary Toxicology and Entomology Research Laboratory, Agricultural Research Service, U.S. Department of Agriculture, College Station, TX 77840.
Abstract :
An FM-FM-modulated radio-telemetry transmitter for detecting and transmitting an electrocardiogram (ECG) and respiration activity simultaneously on a single carrier frequency in the 88-108 MHz band is described. Respiration is detected by the impedance pneumographic principle by using the same pair of electrodes used for the ECG. The circuit requires less than 350 ¿A from a ± 7 V mercury battery supply and about 185 ¿A from a 1.35 V mercury battery. Signals can be transmitted over distances up to 50 ft for about 4 weeks without battery replacement and appreciable changes in calibration.
Keywords :
Batteries; Circuits; Electrocardiography; Electrodes; Frequency; Impedance; Operational amplifiers; Radio transmitters; Telemetry; Toxicology; Animals; Electrocardiography; Electronics, Medical; Respiration; Telemetry;
Journal_Title :
Biomedical Engineering, IEEE Transactions on
DOI :
10.1109/TBME.1976.324564
