Passive biotelemetry
First Claim
1. A biotelemetry system for measuring a physiological variable within a living body, including a radio frequency transmitter to be disposed outside of the body, a radio frequency energy receiver to be disposed outside of the body, and a transponder unit including a sensor sensitive to the physiological variable, wherein the transponder unit is characterised by a modulator unit for controlling radio frequency energy absorption of the transponder unit according to a time-sequence representing said physiological variable, the transponder unit being disposed on a guide wire.
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Accused Products
Abstract
A method and a device for measuring a physiological variable in a living body, whereby a transmitter (1) is disposed outside of the body to transmit radio frequent energy, and a receiver (3) of radio frequent energy is disposed outside of the body. A transponder unit (2), having a sensor (11) sensitive to the physical variable, and a modulator unit (12) for controlling the radio frequent energy absorption of the transponder unit according to a time-sequence representing said physical variable, is introduced into the body. The transmitter sends radio frequent energy of substantially constant frequency and amplitude onto the transponder, and the receiver monitors the radio energy absorption of the transponder unit to determine the time-sequence representing said physical variable. The time-sequence is decoded to interpret it as a measure of the physical variable.
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Citations
18 Claims
- 1. A biotelemetry system for measuring a physiological variable within a living body, including a radio frequency transmitter to be disposed outside of the body, a radio frequency energy receiver to be disposed outside of the body, and a transponder unit including a sensor sensitive to the physiological variable, wherein the transponder unit is characterised by a modulator unit for controlling radio frequency energy absorption of the transponder unit according to a time-sequence representing said physiological variable, the transponder unit being disposed on a guide wire.
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10. A guide wire, having a transponder unit disposed at one end wherein the transponder unit comprises:
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a sensor sensitive to a physiological variable; and
a modulator unit for controlling radio frequency energy absorption of the transponder unit according to a time-sequence representing said physiological variable. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for measuring a physiological variable in a living body, wherein a transmitter is disposed outside of the body to transmit radio frequency energy, and a receiver of radio frequency energy is disposed outside of the body, the method comprising the steps of:
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introducing a guide wire on which is disposed a transponder unit having a sensor sensitive to the physiological variable, and a modulator unit for controlling radio frequency energy absorption of the transponder unit according to a time-sequence representing said physiological variable;
operating the transmitter to provide the transponder unit with a radio frequency energy of substantially constant frequency and amplitude;
operating the receiver to monitor the radio energy absorption of the transponder unit to determine the time-sequence representing said physiological variable; and
decoding said absorption time-sequence to interpret said absorption time-sequence as a measure of the physiological variable. - View Dependent Claims (18)
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Specification