Date of Award

Fall 2001

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Biomedical Engineering

First Advisor

Jeutter, Dean C.

Second Advisor

Prieto, Thomas E.

Third Advisor

Fitts, Robert

Abstract

Batteries are often the limiting factor in the size and lifetime of implantable biotelemeters. The purpose of this study was to demonstrate that a "battery-less" implantable biotelemeter could function by receiving power transmitted across the skin. A wirelessly powered electrocardiogram (ECG) telemetry system was developed and tested in a laboratory rat. High quality ECG readings were taken and stored on a laptop PC with reliable heart rate detection and a graphical user interface. The implant was small (27 mm diameter, 6 mm thickness) and could be powered at a 0 range of up to 3 em. An external device included a handheld inductive coil used to power the implant. The implant transmitted ECG data to the external circuit by modulating its tuned circuit impedance. (This transmission technique has been described as passive signaling). Transmission of a high quality ECG from an implanted animal was accomplished. The external device demodulated the ECG data and sent it over a cable to a laptop PC for data storage, display, and heart rate calculation. The system performed well with good signal fidelity (1.3% non-linearity related to the output) and a bandwidth of 0.7 Hz to 100Hz.

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