Design of FPGA-based Diversity Engine for RF Cardiac Medical System

OData support
Dr. Takács Gábor
Department of Electron Devices

A decade ago, most of medical devices were implanted using wires to communicate with

circuitry outside the body. However wires often create surgical complications, including

breakage, infection and electrical noise. One of the alternatives is to establish wireless

communication using RF telemetry with implantable devices. Over the past couple of

decades, the radio Frequency (RF) technologies have evolved to such extend that it has

overcome the challenges encountered for implantable devices. The fundamental challenge is

the reduction of power and signal integrity for propagation of RF field due to EM absorption

and impedance boundaries of biological tissues in human body.

Additional challenge includes miniaturization and establishment of reliable communication

link with external world for daily monitoring basis especially when device is surrounded

other RF devices in places such as ICU (Intensive Care Unit). The traditional implants

used inductive links for communication which has limitations such as short range, physical

contact with subject, low frequency and convenient for home monitoring thereby, need for

higher data rates with longer range of communications were required.

To overcome above challenges a new Communication service MICS having frequency range

between 402-405 MHz was introduced by FCC in 1999.

This communication service is ultra Low power consumption, unlicensed mobile radio service

for transmitting data for diagnostic and real time monitoring purposes. As mentioned in

figure 4.1 Comparison of wired communication with RF using this communication service

it is now possible to upload the patient events into IMD and then transmit to base station

for analysis. With longer range it is now feasible for elderly people to monitor real time

data of IMD in-house with ease.

This document elaborates the state of art technique used to optimize the functionality of

base station using customized FPGA.


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