Harada E, Yonezawa Y, Caldwell W M, Hahn A W
Dept. of Electronics Engineering, Hiroshima Institute of Technology, Hiroshima 731-51, Japan.
Biomed Sci Instrum. 1999;35:63-7.
A telemetry system employing a low power 8-bit microcontroller has been developed for chronic unanesthetized small animal studies. The two-channel system is designed for use with animals in shielded cages. Analog signals from implantable ECG and nerve electrodes are converted to an 8-bit serial digital format. This is accomplished by individual 8 bit A/D converters included in the microcontroller, which also has serial I/O port. The converted serial binary code is applied directly to an antenna wire. Therefore, the system does not need to employ a separate transmitter, such as in FM or infrared optical telemeters. The system is used in a shielded animal cage to reduce interference from external radio signals and 60 Hz power line fields. The code is received by a high input impedance amplifier in the cage and is then demodulated. The telemeter is powered by a small 3 V lithium battery, which provides 100 hours of continuous operation. The circuit is constructed on two 25 x 25 mm. printed circuit boards and encapsulated in epoxy, yielding a total volume of 6.25 cc. The weight is 15 g.
已开发出一种采用低功耗8位微控制器的遥测系统，用于慢性未麻醉的小动物研究。该双通道系统设计用于与置于屏蔽笼中的动物配合使用。来自可植入心电图和神经电极的模拟信号被转换为8位串行数字格式。这是通过微控制器中包含的独立8位模数转换器完成的，该微控制器还具有串行输入/输出端口。转换后的串行二进制代码直接应用于天线导线。因此，该系统无需使用单独的发射器，如调频或红外光学遥测仪中的发射器。该系统用于屏蔽动物笼中，以减少外部无线电信号和60赫兹电源线场的干扰。代码由笼中的高输入阻抗放大器接收，然后进行解调。遥测仪由一个小型3伏锂电池供电，可提供100小时的连续运行。该电路构建在两块25×25毫米的印刷电路板上，并封装在环氧树脂中，总体积为6.25立方厘米。重量为15克。
