Wireless communication of physiological variables using spread spectrum

摘要

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 (314) 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 (322) disposed outside the body provides this supply voltage to the sensor. The control unit also receives, from the sensor, via a wired connection (311), signals that represent the physiological variables that are measured. The control unit is arranged with a communication interface (401, 701) and a modulator (301) for wireless spread spectrum communication of the measured physiological variables for presentation purposes.

主权项

1. A system for measuring a physiological variable in a body, which system comprises:
a sensor arranged to be disposed in the body, the sensor being configured to measure the physiological variable and to provide a signal representing the measured physiological variable; a battery; a control unit configured 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 comprises:
a modulator configured to modulate a carrier signal with the signal representing the measured physiological variable, which is received by the control unit, to provide a modulated signal, anda communication interface configured to communicate the modulated signal by wireless spread spectrum communication, wherein the wired connection comprises a guide wire configured to position the sensor within the body, wherein the control unit is configured such that a path between the communication interface and a device receiving the wireless spread spectrum communication does not pass through tissue, wherein the battery provides power to the control unit and to the sensor.