Wireless data transmission system by FM for health monitoring

This paper describes a novel data transmission system for the air-cushion type biomedical measurement system. Conversational data transmission via coaxial cable sometimes intimidates the patients; the electric cable near the bed is not desirable for medical doctors and nurses, either. To solve this problem, we developed an FM transmission system that is battery driven and transmits signals from DC to several kHz. The signal to be transmitted by the proposed FM wireless transmitter is measured by a pneumatic sensing system.

1. Introduction

The air-cushion type biomedical measurement system can measure heartbeat, respiration, snoring, and body motion^[1]. In the conventional system, the bio-signal is transmitted to the processor via cable, which presents problems for patients but and medical staff alike. Here we improve the conventional system by replacing the coaxial cable with a radio transmission system that is battery driven. The frequency range for bio-measurements is very low in comparison with that for audio signals. Few stable wireless transmission systems have been implemented; those that have been introduced were very expensive, with high energy consumption rates for long-term battery use. A stable, simple and low-energy wireless transmission system to send signals from DC to several kHz is described below.