JPS58177634A - Apparatus for detecting motion of living body organ - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motion detection device for a living organ that measures the movement of a living organ from the body surface without using electrodes or the like.

and the present inventors filed a % application on November 1, 1972.
No. 35448 (#Kokusho No. 56-45613), we proposed a motion detection device for living organs, which made it possible to stably measure the motion of living organs with high precision.

However, clinically, we have found that it is useful for diagnosis to capture the movement of living organs as three-dimensional information that is measured from shallow parts of the body surface to deep parts, and we have proposed the present invention.

In other words, the purpose of the present invention is to utilize the fact that the electric field is suitable for measuring shallow parts of the surface of a living body and the magnetic field is suitable for measuring deep parts of the living body, so that motion information of shallow parts and deep parts of living organs can be detected in the same manner. The present invention further provides a device for detecting movement of living organs that can simultaneously measure and record motion.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the functional configuration of the biological organ motion detection device according to the present invention. It has a detector A consisting of a detection coil a and a variable frequency/amplitude oscillator, and one branch of the oscillation output of the scissor detector A is supplied to a frequency mixer dK together with the oscillation output of the reference station wave number oscillator C, and the two oscillation frequencies are A difference frequency output is formed. Furthermore, the output of this difference frequency is converted into a voltage signal FM by a frequency-voltage converter e. The other branch of the output of the detector A is supplied to the detector IK and converted into a low frequency signal AM. Analog switch Swi provided at the input/output end of amplifier f
, 8wo is electronically selected and controlled by the selection signal S, and if the selection is on the FM side, a change in frequency is detected, and the good signal FM is amplified and supplied to one input channel of the recorder g, and 1 selection is selected. If it is on the imaginary side, the signal AM detecting the amplitude change is selectively amplified and supplied to the other input channel of the recorder g. The recorder g is capable of simultaneously recording the input signals of the above two channels,
The input to the amplifier f is selected by the selection signal S having a frequency sufficiently faster than the frequency of the separate biological information signals FM and AM obtained by detecting the movement of the biological organs, and the input is sent to the recorder g. By distributing the appearance of the information, it becomes possible to simultaneously record different biological information that occurred at the same time. (In addition, Fig. 4 shows the other side of the detector when the detection capacitor h is used.) Stability of the oscillation circuit [tj There are frequency stability and amplitude stability. Because these two influence each other.

If one is stabilized, the other will also be stabilized.

In the present invention, the frequency stability is extremely improved by using a crystal oscillator, and the amplitude stability is also improved accordingly.

On the other hand, a crystal resonator has very little loss, so even if the loss of a coil or capacitor connected to the crystal oscillator changes slightly due to influence from the outside world, the oscillation amplitude will change sharply.

In the detector according to the present invention, as shown in FIG.
A variable frequency amplitude oscillator BL is installed in the upper part of the cylindrical case 2, and a power supply cable 3 and an output cable 4 are installed in the upper part of the cylindrical case 2.
t- is provided, or the power supply cable 3 and the output take-out cable 4t are shared and connected to the measuring device B. By bringing this detector close to the living organ, the magnetic field generated from the detection coil a in the detector A reaches deep into the living body.
As the living organ moves, the loss housing of the detection coil tortoise changes, changing the oscillation amplitude. Also, the detection coil
Stray capacitance exists between the constituent windings and the biological surface,
Along with the movement of the living organ, the distance between the coil and the living body surface changes, changing the oscillation frequency. Although these changes in the oscillation width and oscillation frequency are small, the change in the oscillation frequency is the frequency of the 11::111 difference between the oscillation frequency of the reference frequency oscillator C and the oscillation frequency of the variable frequency width oscillator C. is formed using a frequency mixer dK, and then the frequency -
By converting the difference frequency into a voltage using a voltage converter e and then amplifying it, the change in the oscillation width of the variable frequency amplitude oscillator is detected via the detector t'. By widening this, measurement is made easier.

FIG. 2 shows an example of an oscillation circuit according to the present invention, in which an FE
A crystal resonator 6, a coil a, and a variable capacitor 7 are connected in series to the gate electrode of the T (or transistor) 5,
Other parts (gate resistor 8, capacitor 9, gate-source capacitance 10, source-drain capacitor 11, high frequency choke 12° source resistor 13, output coupling capacitor 141, drain i resistor 15, bypass capacitor 1g) A variable amplitude oscillator is formed.

Incidentally, the coil a, the high frequency choke 12, or the capacitors 7, 9, 10, 11, 14, and 16 all act as a detection section by facing the body surface.

In the above circuit, a coil a of an appropriate value is connected in series outside the crystal oscillator 6, so by changing the value of a part of the confectionery that makes up the entire oscillation circuit, the oscillation frequency and amplitude of the crystal oscillator 60 can be widened. It has the stability that the crystal resonator 6 inherently has. Focusing on the fact that the amount of change in the oscillation frequency and amplitude is 10 to 100 times the amount of change in frequency and amplitude that can be changed by the variable capacitor 7 without coil a, this is used to measure the movement of biological organs. The present invention is applied to a device to detect the proximity of a living organ to a detection coil a or a detection capacitor h with good sensitivity.

In principle, the KFi variable capacitor 7Fi can operate without it, but the variable capacitor 7 allows the frequency or amplitude to be adjusted when the device is not close to a living organ.

The optimum value of coil a varies depending on the oscillation frequency, and it may require a size of several 10μH, but in that case, KFi, a part of coil a is used as a detection coil, and the other part is a fixed coil using a crystal. It may be installed near the oscillator 60. If a detection capacitor tb is used, one part may be used as a detection capacitor h depending on the required weight, and the other part may be installed as a fixed capacitor near the crystal oscillator 60. Also, by the duality theorem, the crystal oscillator 6,
The same operation can be achieved by connecting the detection coil 11 and the variable capacitor 7t in parallel. The same operation can be achieved by connecting any two of the variable capacitors 7 in parallel and connecting the remaining elements in series, or by connecting the remaining elements in parallel with the two parallel-connected elements.

In this embodiment, a crystal oscillator is used to improve the accuracy and stabilize the detector, but a mechanical oscillator may be used instead of the crystal oscillator to perform the same operation.

In this way, the present invention uses, for example, a crystal resonator 6 with a stable oscillation frequency and amplitude, sets the oscillation frequency and amplitude to optimal values, and uses the detection coil 1 or the detection capacitor h.
For example, you can record the state of your heart's movement just by placing it on your chest.
In addition to being able to record accurately, the aspect ratio recording can always be detected stably and with high sensitivity. And 1
The oscillation circuit A can simultaneously serve as a probe of a device for detecting the movement of living organs by changing the oscillation width and a glove of a device for detecting the movement of living organs by changing the oscillation frequency.
This makes it possible to simultaneously record separate biological information for the deep part of the body and the superficial part of the body that occurred at the same time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the functional configuration of a biological organ motion detection device according to an embodiment. 2 is an oscillation circuit diagram of the detector, FIG. 3 is a perspective view of the detector when designed as a cardiac motion measuring device, and FIG. 4 is a block diagram showing the other side of the detector A.

Claims (1)

[Claims] 1. The coil in the LC oscillator is made of living body I! ! disposed on a surface, causing a change in loss in the coil due to the movement of organs deep in the living body, thereby changing the oscillation width of the LC oscillator, and detecting the movement deep in the living body as a change in the oscillation width;
The movement of the surface of the body in conjunction with the movement of the deep part of the body causes a change in the stray capacitance between the winding of the coil and the surface of the body, thereby changing the oscillation frequency of the LC oscillator. A motion detection device for a biological organ that simultaneously detects motion as a change in oscillation frequency using the same W oscillation circuit, and includes a crystal oscillator, and the coil is connected in series or parallel to the crystal oscillator. A motion detection device for a living organ, characterized in that: 2. A capacitor in the LC oscillator is placed on the surface of the living body, and the movement of the living body surface causes a change in the capacitance of the capacitor, thereby changing the oscillation frequency of the LC oscillator. to be detected as. A change in loss is caused in a coil provided close to a capacitor of the LC oscillator due to the movement of an organ deep within the body corresponding to the surface of the body. Therefore, the same L
1. A motion detection device for living organs that simultaneously detects motion using a C oscillation circuit, comprising a crystal oscillator, and the capacitor is connected in series or parallel to the crystal oscillator.