Wireless communication of physiological variables using spread spectrum

Abstract

The present invention relates to a system and a method of measuring a physiological variable in a body. A basic idea of the present invention is to measure a physiological variable in a body by means of employing a sensor which is arranged to be disposed in the body for measuring the physiological variable. The sensor must be provided with a supply voltage in order to be operable. Therefore, a control unit disposed outside the body provides this supply voltage to the sensor. The control unit also receives, from the sensor, via a wired connection, signals that represent the physiological variables that are measured. The control unit is arranged with a communication interface and a modulator for wireless spread spectrum communication of the measured physiological variables for presentation purposes.

1 . A system for measuring a physiological variable in a body, which system comprises:
 a sensor arranged to be disposed in the body for measuring the physiological variable and to provide a signal representing the measured physiological variable;   a control unit arranged to be disposed outside the body; and   a wired connection between the sensor and the control unit to provide a supply voltage from the control unit to the sensor, and to communicate said signal from the sensor to the control unit,   wherein the control unit has a modulator for modulating a carrier signal with the reserved signal representing the measured physiological variable and a communication interface for wireless spread spectrum communication of the modulated signal.