Volumetric physiological measuring system and method
First Claim
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1. A device for measuring the movement of an object comprising:
- a. means for creating time-varying magnetic fields at least large enough to surround the object;
b. electrical circuits adapted to conform to the surface of the object;
c. noise reduction circuit means for reducing the sum of signals from an unwanted magnetic field of uniform intensity that is influencing the fields created to surround the object to zero; and
d. voltage monitoring means connected to the electrical circuits, whereby motion of the surface creates a measurable change in induced voltage in the circuits that correlates to the movement of the object.
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Abstract
A system and method for measuring volumes and areas using electromagnetic induction techniques. A current is generated and fed into one of two coil assemblies to induce voltage into another coil assembly to provide accurate values for volume or area.
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Citations
40 Claims
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1. A device for measuring the movement of an object comprising:
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a. means for creating time-varying magnetic fields at least large enough to surround the object;
b. electrical circuits adapted to conform to the surface of the object;
c. noise reduction circuit means for reducing the sum of signals from an unwanted magnetic field of uniform intensity that is influencing the fields created to surround the object to zero; and
d. voltage monitoring means connected to the electrical circuits, whereby motion of the surface creates a measurable change in induced voltage in the circuits that correlates to the movement of the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A device for measuring the signals corresponding to the values of area or volume of at least one object within a homogeneous magnetic field, comprising:
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a. conductive coils configured tightly about the various circumferences of at least one portion of an object within a homogeneous magnetic field;
b. fixed coils remotely located relative to the conductive coils about the object;
c. a noise reduction coil circuit arrangement for reducing the sum of signals to zero from an unwanted magnetic field of uniform intensity that is influencing the magnetic field surrounding the object; and
,d. current generating means for selectively providing alternating current to either one of the conductive coil means or the fixed coil means to create an induced voltage in the other coil means representative of true area or volume within the coils that are configured tightly about the various circumferences of the object portion or portions, with the signals and area/volume changing over time due to the cardiac function of the object. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A method of measuring the area or volume of an object comprising the steps of:
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a. adapting electrical circuits as coils to conform to the object surface;
b. providing electrical circuits remotely located relative to said object;
c. generating a constant and known current in said electrical circuits to produce a relatively homogeneous spatial sensitivity in a defined region around the object;
d. providing a noise reduction circuit to reduce the sum of undesired received signals to zero in the defined region when all the electrical circuits in the defined region are exposed to an undesired uniform magnetic field; and
e. measuring the voltage induced in the electrical circuits by a time-varying uniform magnetic field surrounding the object, whereby the change in the area or volume of the object may be calculated without calibration of said electrical circuits to said object.
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40. A method of measuring the area or volume of an object comprising the steps of:
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a. adapting electrical circuits to the object surface;
b. providing electrical circuits remotely located relative to said object;
c. generating a constant and known current into one of said electrical circuits to produce a relatively homogeneous spatial sensitivity in a defined region around the object;
d. providing a noise reduction circuit to reduce the sum of undesired received signals to zero in the defined region; and
e. measuring the electromagnetic inductive coupling between the electrical circuits, whereby the change in the area or volume of the object may be calculated without calibration of said electrical circuits to said object.
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Specification