Wireless communication of physiological variables using spread spectrum
First Claim
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.
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Accused Products
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 (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.
24 Citations
38 Claims
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1. A system for measuring a physiological variable in a body, which system comprises:
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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, and a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of measuring a physiological variable in a body, which method comprises the steps of:
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measuring the physiological variable with a sensor disposed in the body; communicating, via a wired connection, a signal representing the measured physiological variable from the sensor to a position outside the body; supplying, via the wired connection, the sensor with a supply voltage; modulating, at the position outside the body, a carrier signal with the signal that represents the measured physiological variable to provide a modulated signal; and communicating the modulated signal wirelessly using spread spectrum communication to a remote position, wherein the wired connection comprises a guide wire configured to position the sensor within the body, wherein the step of communicating the modulated signal wirelessly comprises sending the modulated signal along a path to the remote position that does not pass through tissue, wherein said position outside the body comprises a control unit with a wireless interface, wherein a battery at said position outside the body provides power to the control unit and to the sensor. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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Specification