Handheld Medical Eddy Current Induction Damping Sensor
PROBLEM TO BE SOLVED: To easily perform the regulating work of resonance frequency at a low cost by mounting a socket or connector on a coil conductor, and attachably and detachably mounting a capacitor board having a capacitor thereon on the socket or connector. SOLUTION: An RF coil for MRI 100 comprises to coil conductor 1 having the fixed capacitor 2, and the socket 3 provided on a part of the coil conductor 1. The capacitor board 10 having a fixed capacitor 11 thereon is mounted on the coil conductor 1 attachable to and detachable from the socket 3. The used fixed capacitor 2 shares the fixed portion of the resonance frequency, and the fixed capacitor 11 is provided in order to share the variable portion of the resonance frequency, The socket 3 has a number of pins raised thereon, and the pins are inserted to a number of holes of the capacitor board 10. whereby the coil conductor 1 is electrically connected to the capacitor 11.
1 . A handheld inductive sensor apparatus for body diagnostics, the apparatus comprising:
an electrical coil;
a resistive, inductive, and capacitive (RLC) circuit electrically connected with the coil;
a frequency counter electrically connected with the RLC circuit;
an inertial measurement unit (IMU) rigidly connected with the coil; and
a computer processor operatively connected with a machine-readable non-transitory medium embodying information indicative of instructions for causing the computer processor to perform operations comprising:
generating a measured value based on an output from the frequency counter;
calculating a position and an orientation of the coil with respect to a body part of a subject based on output from the IMU; and
associating the position and the orientation with the measured value.
2 . The apparatus of claim 1 wherein the operations further comprise:
accessing a 3-dimensional (3D) model representing the body part; and
rendering, using the model, an image of the body part along with a graphic representing the position and the orientation of the coil with respect to the body part.
3 . The apparatus of claim 2 wherein the model is derived from a computerized tomography (CT) scan or a magnetic resonance imaging (MRI) scan of the body part of the subject.
4 . The apparatus of claim 3 wherein the operations further comprise:
depicting, in the image, an internal feature of the body part based on the MRI scan or CT scan.
5 . The apparatus of claim 2 wherein the model is of a representatively standard body part of the subject's species.
6 . The apparatus of claim 2 wherein the operations further comprise:
determining an anomaly in the body part based on the measured value; and
placing, in the image of the body part, an indicator of the anomaly.
7 . The apparatus of claim 2 wherein the operations further comprise:
receiving a calibration command from a user while the coil is placed against the body part at a predetermined location and a predetermined orientation.
8 . The apparatus of claim 2 further comprising:
a housing for the coil, the housing including an aperture extending through the coil.
9 . The apparatus of claim 8 wherein the operations further comprise:
receiving a command to switch modes;
determining an extent that a surgical tool projects through the aperture based on the measured value; and
depicting, on the image, a depth of the surgical tool within the body part.
10 . A surgical kit comprising:
the apparatus of claim 9 ;
the surgical tool, the surgical tool having conductive rings spaced along a length of a catheter,
wherein the operations further comprise:
counting a number of rings that have passed through the coil; and
calculating the extent based on the counting.
11 . A surgical kit comprising:
the apparatus of claim 9 ;
the surgical tool, the surgical tool having different metals spaced along a length of a catheter,
wherein the operations further comprise:
determining at least one of the metals that has passed through the coil based on a conductivity of the at least one of the metals; and
calculating the extent based on the determining.
12 . A surgical kit comprising:
the apparatus of claim 9 ;
the surgical tool, the surgical tool having an increasing amount of conductive material spaced along a length of a catheter,
wherein the operations further comprise:
determining an amount of conductive material that has passed through the coil; and
calculating the extent based on the determining.
13 . The apparatus of claim 1 further comprising:
a proximity sensor connected with the processor,
wherein the operations further comprise:
determining whether the coil abuts the body part based on an output from the proximity sensor; and
locating the body part in 3-dimensional (3D) space based on the determination.
14 . The apparatus of claim 13 wherein the operations further comprise:
interpolating a surface in 3D space of the body surface based on the locating of the body part.
15 . The apparatus of claim 1 further comprising:
a removable hand grip connected with the coil.
16 . The apparatus of claim 1 wherein the operations further comprise:
indicating, based on the measured value, that the coil has moved away from the subject.
17 . The apparatus of claim 1 wherein the body part is a head of the subject.
18 . The apparatus of claim 17 further comprising:
a housing for the coil, the housing including a recess configured to mate with a nasal bridge of the subject during calibration.
19 . A method of manufacturing a handheld inductive sensor for body diagnostics, the method comprising:
providing an electrical coil;
connecting a resistive, inductive, and capacitive (RLC) circuit electrically with the coil;
electrically connecting a frequency counter with the RLC circuit;
rigidly connecting an inertial measurement unit (IMU) with the coil; and
operatively connecting a computer processor with a machine-readable non-transitory medium embodying information indicative of instructions for causing the computer processor to perform operations comprising:
generating a measured value based on an output from the frequency counter;
calculating a position and an orientation of the coil with respect to a body part of a subject based on output from the IMU; and
associating the position and the orientation with the measured value.
20 . A method of using a handheld inductive sensor for body diagnostics, the method comprising:
providing a sensor having an electrical coil, a resistive, inductive, and capacitive (RLC) circuit electrically connected with the coil, a frequency counter electrically connected with the RLC circuit, an inertial measurement unit (IMU) rigidly connected with the coil, and a computer processor;
generating a measured value based on an output from the frequency counter;
calculating, using the computer processor, a position and an orientation of the coil with respect to a body part of a subject based on output from the IMU; and
associating, using the computer processor, the position and orientation with the measured value.