Method and sensor for wireless measurement of physiological variables
First Claim
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1. A system for measuring a physiological variable in vivo in a human or animal body, comprising:
- a sensor device responsive to said physiological variable, comprising at least one mechanical resonant member disposed in vacuum, a property of which changes in response to the influence of said physiological variable, said resonant member having a quality factor (Q) greater than 10, a transmitter of ultrasound power for exciting said resonant member through body tissue to cause said resonant member to enter into a resonating state, and a receiver for recording a resonance signal emitted from said resonant member.
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Abstract
The sensor guide wire assembly having a sensor element is inserted into the patient'"'"'s body. Acoustic or electromagnetic waves are then emitted from an external source toward the senor element. The sensor element receives the incident waves and enters into a resonating state. The characteristics of the resonance correspond to the variable or variables to be measured. A transducer is located externally from the patient'"'"'s body and receives the scattered wave and transmits a resultant signal to an electronic drive and detection unit for signal analysis.
101 Citations
20 Claims
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1. A system for measuring a physiological variable in vivo in a human or animal body, comprising:
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a sensor device responsive to said physiological variable, comprising at least one mechanical resonant member disposed in vacuum, a property of which changes in response to the influence of said physiological variable, said resonant member having a quality factor (Q) greater than 10, a transmitter of ultrasound power for exciting said resonant member through body tissue to cause said resonant member to enter into a resonating state, and a receiver for recording a resonance signal emitted from said resonant member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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- 11. A sensor device responsive to a physical variable, comprising at least one mechanically resonant member disposed in vacuum, the resonance frequency of which changes in response to the influence of said physical variable, said resonant member being excitable by external means without physical connections to said sensor device, and said resonance frequency of said resonant member being detectable by a receiver without physical connections to said sensor device, said resonant member having a quality factor greater than 10.
Specification