An implantable telemetry system, using a capacitor having high capacitance instead of the rechargeable batteries, has been designed for chronic unanaesthetized animal studies. This system can simultaneously record the cardiac sympathetic nerve activity and ECG. The power of the system is inductively coupled and transmitted to a 2.5 farad capacitor. The system, which is constructed by ultralow power analog and digital standard integrated circuits, has a transmission range up to 5 m, depending on intervening tissue depth and FM receiver characteristics. With the capacitor charging time of 5 minutes, the system can be driven for 120 minutes.
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