Resonator with adjustable capacitor for medical device
First Claim
1. A resonator device, comprising:
- an inductor coil;
a conductive member that extends from the inductor coil, a portion of the conductive member configured as a spiral extending along a longitudinal axis that defines a passage through which at least a portion of the induction coil passes to form a capacitor structure; and
a sleeve of dielectric material between one of the portion of the conductive member and the portion of the induction coil to form a capacitor structure, where the dielectric layer changes at least one of a thickness and a type along a length of the passage to compensate for changes in a cross-sectional area defined by the inductor coil by changes in a capacitance of the resonator device.
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Abstract
An apparatus, system and method of a resonator device with an adjustable capacitor for allowing the resonance frequency (F) of the resonator device to continue to be matched to the Larmor frequency of the MRI system. The resonator device includes an inductor coil, a conductive member, a sleeve having first and second sockets that receive at least portions of the inductor coil and the conductive member as electrodes to provide a capacitor structure. Dielectric material can be positioned between at least the first and second sockets, where changes in the cross sectional area defined by the induction coil cause changes in the capacitance value (C) as one or more of the electrodes move within the socket. Changes in the inductance and the capacitance values allow for the resonance frequency (F) of the resonator device to continue to be matched to the Larmor frequency of the MRI system.
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Citations
7 Claims
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1. A resonator device, comprising:
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an inductor coil; a conductive member that extends from the inductor coil, a portion of the conductive member configured as a spiral extending along a longitudinal axis that defines a passage through which at least a portion of the induction coil passes to form a capacitor structure; and a sleeve of dielectric material between one of the portion of the conductive member and the portion of the induction coil to form a capacitor structure, where the dielectric layer changes at least one of a thickness and a type along a length of the passage to compensate for changes in a cross-sectional area defined by the inductor coil by changes in a capacitance of the resonator device. - View Dependent Claims (2, 3, 4)
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5. A resonator device, comprising:
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an inductor coil; a conductive member that extends from the inductor coil, a portion of the conductive member configured as a spiral extending along a longitudinal axis that defines a passage through which at least a portion of the induction coil passes, where the conductive member forming the spiral tapers to allow changes in a distance between the portion of the induction coil that passes into the passage and the conductive member defining the passage; and a dielectric layer between one of the portion of the conductive member and the portion of the induction coil to form a capacitor structure.
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6. A resonator device, comprising:
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an inductor coil; a conductive member that extends from the inductor coil, a portion of the conductive member configured as a spiral extending along a longitudinal axis that defines a passage through which at least a portion of the induction coil passes; and a dielectric layer between one of the portion of the conductive member and the portion of the induction coil to form a capacitor structure, where the resonance device has a resonance frequency (F) that matches a Larmor frequency of an MRI system, where the F is given by the inverse square root of the product inductance (L) times (x) capacitance (C);
F=1/(2·
(π
)·
(L·
C)^0.5). - View Dependent Claims (7)
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Specification