KR101082210B1 - Capacitive breathing sensor, apparatus and method to detect breathing - Google Patents

Abstract

Disclosed are a capacitive respiratory sensor, a respiratory movement detection device, and a method.

The capacitive respiratory sensor of the respiratory movement detection device uses an elastic insulator and can change the capacitance according to the change in the chest cavity volume.

The respiratory movement detector may detect the respiratory movement according to the capacitance change.

Breathing movement, capacitance, sensor

Description

CAPACITIVE BREATHING SENSOR, APPARATUS AND METHOD TO DETECT BREATHING}

The present invention relates to a capacitive respiratory sensor and a respiratory motion detecting apparatus and method, and to a capacitive respiratory sensor and a respiratory motion detecting apparatus and method for detecting a respiratory motion signal for an active subject in a home healthcare environment. will be.

Recently, due to air pollution and increased smoking rate due to stress, there is a tendency to increase the cases of death from respiratory system diseases or infants choking due to parental carelessness. Therefore, in case of a patient with a respiratory disease, a disabled person or an infant who is unable to cover his or her own body, the patient measures the breathing in real time and immediately warns the guardian or the doctor of the hospital if there is a problem of breathing so that immediate emergency treatment is possible. System is needed. In addition, in order to be grafted into a ubiquitous medical system, there is a need for a biosignal measuring apparatus that can be easily worn, can be monitored in real time, and can provide electrical safety.

Accordingly, an object of the present invention for solving the above problems is to provide a respiratory motion detection device and method using a capacitive sensor that is suitable for a portable, easy to manufacture, but can accurately detect the respiratory motion.

Capacitive respiratory sensor according to an embodiment of the present invention, the insulator composed of an elastic insulator; A first electrode plate provided on the insulator; And a second electrode plate provided under the insulator.

A first cover provided on an upper side of the first electrode plate to protect the first electrode plate; And a second cover provided below the second electrode plate to protect the second electrode plate.

The insulator, the first electrode plate, and the second electrode plate may be provided in a roll form to form a multilayer.

The insulator may be any one of paper, fiber, polymer sponge, and air gap.

On the other hand, respiratory movement detection device according to an embodiment of the present invention, using an elastic insulator, the capacitance-type respiratory sensor that changes the capacitance in accordance with the chest cavity volume change; And it may include a respiratory movement detector for detecting the respiratory movement in accordance with the capacitance change.

The breathing sensor, the insulator composed of the elastic insulator; A first electrode plate provided on the insulator; And a second electrode plate provided under the insulator.

The respiratory movement detection unit, an oscillator for outputting an oscillation frequency that changes according to the change in the capacitance; A frequency counter counting the output oscillation frequency; And a controller for determining a breathing cycle in consideration of the period in which the oscillation frequency is counted.

The respiratory movement detection unit, an oscillator for outputting an oscillation frequency that changes according to the change in the capacitance; A converter for converting the output oscillation frequency into a voltage; And a controller configured to detect a zero crossing of the converted voltage to determine a breathing cycle.

And a warning generation unit generating a warning signal informing of an emergency, wherein the control unit determines that a breathing abnormality has occurred and generates the warning signal when the determined breathing period is greater than an upper limit reference value or less than a lower limit reference value. The warning generator may be controlled to control the warning generator.

On the other hand, the respiratory movement detection method according to an embodiment of the present invention, the capacitance of the capacitive type breathing sensor using the elastic insulator, changing the chest cavity volume change; And detecting a respiratory movement according to the capacitance change.

The changing step may include changing a gap between the electrode plates of the respiratory sensor according to the chest cavity volume conversion; And changing the capacitance according to the change in the electrode plate spacing.

The detecting may include outputting an oscillation frequency that varies according to the capacitance change; Counting the output oscillation frequency; And determining a breathing cycle in consideration of the period in which the oscillation frequency is counted.

The detecting may include outputting an oscillation frequency that varies according to the capacitance change; Converting the output oscillation frequency into a voltage; And detecting a zero crossing of the converted voltage to determine a breathing cycle.

The determining may include determining that a respiratory abnormality occurs when the amount of change in the respiratory cycle that is determined is greater than an upper limit reference value or less than a lower limit reference value, and generates a warning signal indicating that an emergency situation occurs when the respiratory abnormality occurs. It may further comprise the step.

According to the proposed embodiment of the present invention, the respiratory movement detection device is suitable for a portable type, and is easy to manufacture and can accurately detect the respiratory motion.

In addition, according to an embodiment of the present invention, since the capacitance change of the capacitive breathing sensor causes a change in the frequency of the oscillator, the capacitance accuracy of the breathing sensor may not affect the detection of breathing movement. Therefore, it is possible to easily determine whether breathing abnormality occurs by detecting the breathing cycle or the change in breathing without having a circuit for precise detection of capacitance.

In addition, according to an embodiment of the present invention, the respiratory movement detection device using a change in capacitance is worn in the form of a patch or band in the chest or abdomen, it is easy to remove and carry, minimizing the additional circuit for breath detection It can operate robustly to external noise and motion noise in the state.

In addition, according to an embodiment of the present invention, the respiratory sensor and the respiratory movement detection device has a planar structure with a small volume, high sensitivity, and a large dynamic range.

 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In describing the present invention, when it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terminology used herein is a term used to properly express a preferred embodiment of the present invention, which may vary according to a user, an operator's intention, or a custom in the field to which the present invention belongs. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

Capacitive sensors are a type of capacitive sensor, and have recently been applied to various products. For example, home automation devices with hidden capacitive touch sense buttons, as well as computer keyboards with capacitive slides, touch pads, buttons and the like, have been commercialized in recent years as a replacement for mechanical and analog products. These sensors can also be applied to mobile phones and music players.

In particular, capacitive touch sensors are rapidly progressing as essential components of many electronic products. Just as touch sensors have been applied to Apple's iPods, capacitive sensors are emerging as replacements for mechanical buttons, switches and slides. This is because capacitive touch sensors are durable, stable, and have aesthetic value over conventional mechanical buttons.

1 is a view showing a capacitive breathing sensor according to an embodiment of the present invention.

Referring to FIG. 1, the respiration sensor 100 is a sensor in which capacitance is changed according to a force of pressing an electrode by inserting an elastic insulator between electrode plates. To generate capacitance. To this end, the breathing sensor 100 may include an insulator 110, a first electrode plate 120, a second electrode plate 130, a first cover 140, and a second cover 150.

The insulator 110 is composed of a compressible elastic insulator, and an insulator of various materials such as paper, fiber, polymer sponge, and air gap may be used. At this time, the elastic insulator may be composed of a single material, or may be configured by combining two or more materials. Since the dielectric constant is changed according to the insulator of the insulator 110, the breathing sensor 100 having a large dynamic range can be manufactured by adjusting the insulator in consideration of the use purpose, the condition of the subject, and the surrounding environment. have.

The first electrode plate 120 may be provided above the insulator 110, and the second electrode plate 130 may be provided below the insulator 110. That is, the insulator 110 is filled between two parallel metal electrode plates 120 and 130. When a voltage is applied to the respiratory sensor 100, charge is accumulated in the respiratory sensor 100, and the degree of the ability to accumulate the charge is called capacitance.

The first cover 140 is provided on the upper side of the first electrode plate 120 to protect the first electrode plate 120. The second cover 150 is provided below the second electrode plate 130 to protect the second electrode plate 130.

FIG. 2A is a view showing a state in which a force is applied to the capacitive breathing sensor of FIG. 1, and FIG. 2B is a view showing a symbol of the capacitive breathing sensor of FIG. 2A. Referring to FIGS. 2A and 2B, the marked force shows that the volume of the chest cavity is changed by the breathing of the user wearing the breathing sensor 100, thereby applying a force to the breathing sensor 100. The force, ie, the volume change of the chest cavity, can be exerted from both directions or at least one direction of the breathing sensor 100.

In addition, referring to FIG. 2A, the insulator 110, the first electrode plate 120, the second electrode plate 130, the first cover 140, and the second cover 150 are spaced apart from each other. May have a form of coalescing.

3a to 3c and 4 show the principle of the capacitive breathing sensor. 3B and 3C, there is an insulator 110 having a dielectric constant between the first electrode plate 120 and the second electrode plate 130, and the first electrode plate 120 and the second electrode plate 130. ) Moves by the distance x, the area where charges accumulate decreases from A to (A-ΔA). The capacitance is proportional to the area.

3A and 4, the first electrode plate 120 moves in a direction perpendicular to the moving direction of the first electrode plate 120 of FIG. 3A, and the insulator 110 and each electrode plate 120 and 130. ) Are spaced apart by (dx) and d.

5 is a view showing a capacitive breathing sensor according to another embodiment of the present invention. Referring to FIG. 5, the respiration sensor 500 according to another embodiment of the present invention may be implemented in the form of a roll, thereby having a multilayer structure. That is, the respiratory sensor 500 includes the above-described insulator 110, the first electrode plate 120, the second electrode plate 130, the first cover (not shown) and the second cover (not shown) in the form of a roll. Can be prepared. When the respiratory sensor 500 has a roll shape, the capacitance change appears regularly according to the position at which the respiratory sensor 100 is compressed, and may also increase the capacitance.

6 is a block diagram showing a respiratory movement detection apparatus using a respiratory sensor according to an embodiment of the present invention.

Referring to FIG. 6, the respiratory motion detection apparatus 600 may include a respiratory sensor 100 and a respiratory motion detection unit 600a.

The respiration sensor 100 uses an elastic insulator and allows the capacitance to change according to the change in the chest cavity volume. The breath sensor 100 may be in the form of a flat plate as shown in FIG. 2A or in the form of a roll as shown in FIG. 5. Since the respiration sensor 100 has been described with reference to FIGS. 1 to 5, a detailed description thereof will be omitted. The respiratory sensor 100 provided at a site related to respiratory movement, such as a thoracic cavity or abdomen of a user, generates a capacitance according to a change in respiration volume of the user.

The respiratory movement detector 600a may detect the respiratory movement according to the capacitance change of the respiratory sensor 100. To this end, the respiratory movement detection unit 600a may include a first oscillator 610, a frequency counter 620, a first storage unit 630, a first control unit 640, and a first warning generator 650. have.

The first oscillator 610 outputs an oscillation frequency that changes according to the capacitance change of the breathing sensor 100. This is because the capacitance change due to the change in the chest cavity volume changes the oscillation frequency of the first oscillator 610 using the resistor and the condenser.

The frequency counter 620 counts the oscillation frequency output from the first oscillator 610. The frequency counter 620 may count frequencies using a high speed counter. For example, the frequency counter 620 may detect a peak of the oscillation frequency to detect an upward or downward change in the frequency and count the frequency accordingly.

The first storage unit 630 may store the counting result of the frequency counter 620. For example, the first storage unit 630 may sequentially store counting values per unit time.

The first control unit 640 may determine the breathing cycle in consideration of the period in which the oscillation frequency is counted, and determine whether an emergency situation occurs.

In detail, the first controller 640 may determine that a respiratory abnormality occurs when the oscillation frequency is counted, that is, when the respiration period is greater than the predetermined upper limit reference value or smaller than the predetermined lower limit reference value. That is, the first control unit 640 may determine that the breathing rate is rapidly increased if the breathing period is greater than the upper limit reference value, and may be determined to be rapidly reduced if the breathing period is smaller than the lower limit reference value. If it is determined that an emergency situation occurs, the first controller 640 may control the first warning generator 650 to generate a warning signal.

The first warning generator 650 may generate a warning signal informing of an emergency. For example, the first warning generation unit 650 outputs a warning sound around, and may include a speaker (not shown) for this purpose. In addition, the first warning generator 650 may send a short message to a guardian or a hospital official stored in the first storage unit 630 or attempt an automatic telephone connection to an emergency center such as 119. To this end, the first warning generator 650 may further include an RF transmitter (not shown).

7 is a block diagram illustrating a respiratory movement detection apparatus using a respiratory sensor according to another embodiment of the present invention.

Referring to FIG. 7, the respiratory movement detecting apparatus 700 may include a respiratory sensor 100 and a respiratory movement detecting unit 700a.

The respiration sensor 100 uses an elastic insulator and allows the capacitance to change according to the change in the chest cavity volume. The breath sensor 100 may be in the form of a flat plate as shown in FIG. 2A or in the form of a roll as shown in FIG. 5. Since the respiration sensor 100 has been described with reference to FIGS. 1 to 5, a detailed description thereof will be omitted.

The respiratory movement detector 700a may detect the respiratory movement according to the capacitance change of the respiratory sensor 100. To this end, the respiratory motion detector 700a may include a second oscillator 710, a converter 720, a second storage 730, a second controller 740, and a second alert generator 750. have.

The second oscillator 710 outputs an oscillation frequency that changes according to the capacitance change of the respiratory sensor 100. This is because the capacitance change due to the change in the chest cavity volume changes the oscillation frequency of the second oscillator 710 using the resistor and the capacitor.

The converter 720 converts the oscillation frequency output from the second oscillator 710 into a voltage. As a result, the converted voltage output from the converter 720, that is, the respiratory cycle pattern may have an analog form.

The second storage unit 730 may store an analog voltage, that is, a pattern of a breathing cycle. The converted analog voltage may be converted into a digital signal and stored.

The second control unit 740 may detect a zero crossing of the converted voltage to determine a breathing cycle and determine whether an emergency situation occurs. In detail, the second control unit 740 detects the breathing pattern of the inhalation and arc type by differentiating the signal of the converted voltage, and detects the zero crossing of the differentiated breathing signal to perform the breathing cycle. Can be analyzed. The second controller 740 detects the zero crossing from the analog voltage, and determines that the breathing has changed every time the zero crossing is detected. Each time zero crossing is detected, the second controller 740 may determine that the suction and the arc type alternately occur.

The second control unit 740 checks the interval at which the zero crossing is detected, that is, the breathing cycle, and if the confirmed breathing cycle is greater than the predetermined upper limit reference value or less than the predetermined lower limit reference value, the breathing abnormality is generated. You can judge. When the detected breathing period is greater than the upper limit reference value, the second control unit 740 may determine that the breathing rate is rapidly increased. If the breathing period is smaller than the lower limit reference value, the second control unit 740 may determine that the breathing rate is rapidly reduced. In addition, the second controller 740 may determine that an emergency situation has occurred and control the second warning generator 750 to generate a warning signal.

The second warning generator 750 may generate a warning signal informing of an emergency. Since this is the same as the first warning generator 650, a detailed description thereof will be omitted.

The above-described respiratory movement detecting apparatuses 600 and 700 may be provided in the form of a patch or a belt on the rib portion of the user. In the case of FIG. 8, the user may attach the respiratory motion detection apparatuses 600 and 700 having the respiratory sensor 100 to the body or the clothing and wear the belt 100a. The volume change of the thoracic cavity (or thoracic cavity) in response to respiratory movements provides a tension force to the belt and a compressive force to the capacitive breathing sensor 100. The change in capacitance due to the change in thoracic volume changes the oscillation frequency and consequently makes it possible to detect the breathing cycle.

9 is a flowchart illustrating a respiratory movement detection method according to an embodiment of the present invention.

6 and 9, in operation 910, when the capacitive breathing sensor 100 using the elastic insulator is provided to the subject, the chest cavity volume may be changed according to the breathing movement of the subject.

In operation 920, the interval between the electrode plates 120 and 130 of the respiratory sensor 100 may change according to the transformation of the chest cavity volume.

In operation 930, the capacitance may change as the gap between the electrode plates 120 and 130 changes.

In operation 940, the first oscillator 610 may output an oscillation frequency corresponding to the changing capacitance.

In step 950, the frequency counter 620 counts the oscillation frequency output in step 940, and the counting result may be stored.

In operation 960, the first controller 640 may determine a breathing cycle using the counting result of the oscillation frequency.

In step 970, if it is determined that an abnormality occurs in breathing, in step 980, the first controller 640 may control the first warning generator 650 to output a warning signal to the outside. The first controller 640 may compare the respiratory cycle and the predetermined reference values every time the respiratory cycle is detected, and determine whether abnormal breathing occurs.

10 is a flowchart illustrating a respiratory movement detection method according to another embodiment of the present invention.

7 and 10, in step 1010, when the capacitive breathing sensor 100 using the elastic insulator is provided to the subject, the chest cavity volume may be changed according to the breathing movement of the subject.

In operation 1020, the interval between the electrode plates 120 and 130 of the respiratory sensor 100 may change according to the transformation of the chest cavity volume.

In operation 1030, the capacitance may change as the gap between the electrode plates 120 and 130 changes.

In operation 1040, the second oscillator 710 may output an oscillation frequency corresponding to the changing capacitance.

In operation 1050, the converter 720 may convert the oscillation frequency output in operation 1040 into a voltage, and the converted voltage may be stored in a digital form.

In operation 1060, the second controller 740 may determine a breathing cycle by detecting zero crossing from the analog pattern of the converted voltage. That is, whenever the zero crossing is detected, the second controller 740 may determine that breathing or breathing occurs alternately, and may determine a breathing cycle.

In operation 1070, when it is determined that an abnormality occurs in the breath, in operation 1080, the second controller 740 may control the second warning generator 750 to output the warning signal to the outside. The second controller 740 may compare the respiratory cycle and the predetermined reference values every time the respiratory cycle is detected, and determine whether abnormal breathing occurs.

6 and 7 describe the respiratory movement detecting apparatus of FIG. 1 as an example, but is not limited thereto, and the respiratory movement detecting apparatuses 600 and 700 may have a roll-like respiration as shown in FIG. 5. Of course, the sensor 500 can be used.

In addition, the above-described respiratory movement detection device and method using the capacitive type breathing sensor 100 detects a voltage signal proportional to the conversion of the thoracic volume, and uses a method of detecting a relative change in the thoracic volume. Since the capacitance change of the capacitive type respiratory sensor 100 causes a change in the oscillation frequency, the capacitance accuracy of the respiratory sensor 100 is not a problem in detecting the respiratory movement.

11 is a view showing a respiratory movement detection apparatus according to another embodiment of the present invention. The respiratory movement detection device 1100 illustrated in FIG. 11 may be worn by the subject in the form of a buckle. That is, the examinee can easily carry the respiratory movement detecting device 1100 in the waist belt of the examinee using the holes h1 and h2 provided at both sides of the respiratory movement detecting device 1100.

12 is a view illustrating the inside of the respiratory movement detecting apparatus of FIG. 11. Referring to FIG. 12, the capacitive respiratory sensor 1130 and the respiratory motion detection circuit 1140 are cased by the housings 1110 and 1120 to be protected from external shock.

The capacitive breathing sensor 1130 may be smaller than or equal to the size of the hole h3 provided in the upper housing 1110. Therefore, the capacitive type breathing sensor 1130 may be provided at the same height as the surface of the respiratory movement detecting device 1100 or at a lower or higher protrusion through the hole h3 to detect the respiratory movement. The capacitive breathing sensor 1130 may be the breathing sensors 100 and 500 illustrated in FIG. 1 or 5, and the breathing motion detecting circuit 1140 is the breathing motion detecting unit 600a described with reference to FIG. 6 or 7. , 700a). Therefore, for convenience of description, detailed descriptions of the capacitive type breathing sensor 1130 and the respiratory motion detection circuit 1140 will be omitted.

The method according to the present invention can be implemented in the form of program instructions that can be executed by various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal line, a wave guide, or the like, including a carrier wave for transmitting a signal designating a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

For example, the capacitive type breathing sensor may have a different form of a multilayer structure, unlike the multilayer structure shown in FIG. 5. FIG. 13 shows a multilayer structure composed of two insulators 1310 and 1311 and four electrode plates 1320, 1321, 1330, and 1331. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

1 is a view showing a capacitive breathing sensor according to an embodiment of the present invention,

Figure 2a is a view showing a state in which a force is applied to the capacitive breathing sensor of Figure 1,

Figure 2b is a symbolic representation of the capacitive breathing sensor of Figure 2a,

3a to 3c and 4 show the principle of the capacitive breathing sensor,

5 is a view showing a capacitive breathing sensor according to another embodiment of the present invention;

Figure 6 is a block diagram showing a respiratory movement detection device using a breathing sensor according to an embodiment of the present invention,

7 is a block diagram showing a respiratory movement detection apparatus using a respiratory sensor according to another embodiment of the present invention;

8 is a view showing an embodiment in which the respiratory movement detection device is applied to a human body,

9 is a flowchart illustrating a respiratory movement detection method according to an embodiment of the present invention;

10 is a flowchart illustrating a respiratory movement detection method according to another embodiment of the present invention;

11 is a view showing a respiratory movement detection apparatus according to another embodiment of the present invention,

12 is a view showing the inside of the respiratory movement detecting apparatus of FIG. 11, and

13 is a view showing a capacitive breathing sensor according to another embodiment of the present invention.

Claims (14)

An insulator composed of a compressible elastic insulator; A first electrode plate provided on the insulator; And A second electrode plate provided below the insulator, The insulator, the first electrode plate and the second electrode plate are provided in a roll form to form a multilayer in which a change in capacitance regularly appears according to the position at which the capacitive breathing sensor is compressed. Characterized in that the distance between the first electrode plate and the second electrode plate changes according to the chest cavity volume change of the subject, and the capacitance changes according to the change of the distance between the first electrode plate and the second electrode plate, Capacitive Breathing Sensor. The method of claim 1, A first cover provided on an upper side of the first electrode plate to protect the first electrode plate; And A second cover provided below the second electrode plate to protect the second electrode plate; Capacitive breathing sensor further comprising. delete The method of claim 1, The compressible elastic insulator is any one of paper, fiber, polymer sponge, air gap, capacitive breathing sensor. A capacitive respiratory sensor that uses a compressible elastic insulator and whose capacitance changes according to a change in chest cavity volume; And Respiratory movement detection unit for detecting the respiratory movement in accordance with the capacitance change, The capacitive breathing sensor, An insulator composed of a compressible elastic insulator; A first electrode plate provided on the insulator; And A second electrode plate provided below the insulator, The insulator, the first electrode plate and the second electrode plate may be provided in a roll form to form a multilayer in which a change in capacitance regularly appears according to a position at which the capacitive breathing sensor is compressed. Characterized in that the distance between the first electrode plate and the second electrode plate changes according to the chest cavity volume change of the subject, and the capacitance changes according to the change of the distance between the first electrode plate and the second electrode plate, Respiratory movement detection device. The method of claim 5, The compressible elastic insulator is any one of paper, fiber, polymer sponge, air gap, Respiratory movement detection device. The method of claim 5, The respiratory movement detection unit, An oscillator for outputting an oscillation frequency that changes according to the capacitance change; A frequency counter counting the output oscillation frequency; And Control unit for determining the respiratory cycle in consideration of the period in which the oscillation frequency is counted Respiratory movement detection device comprising a. The method of claim 5, The respiratory movement detection unit, An oscillator for outputting an oscillation frequency that changes according to the capacitance change; A converter for converting the output oscillation frequency into a voltage; And A control unit for determining the breathing cycle by detecting the zero crossing of the converted voltage Respiratory movement detection device comprising a. 9. The method according to claim 7 or 8, Warning generator that generates a warning signal for an emergency More, The control unit, if the determined breathing period is greater than the upper limit reference value or less than the lower limit reference value, the breathing abnormality is determined, and the breathing movement detection device for controlling the warning generating unit to generate the warning signal. Changing the capacitance of the capacitive respiratory sensor using a compressible elastic insulator in response to a change in the chest cavity volume; And Detecting a respiratory movement according to the capacitance change, The capacitive breathing sensor, An insulator composed of a compressible elastic insulator; A first electrode plate provided on the insulator; And A second electrode plate provided below the insulator, The insulator, the first electrode plate and the second electrode plate may be provided in a roll form to form a multilayer in which a change in capacitance regularly appears according to a position at which the capacitive breathing sensor is compressed. Characterized in that the distance between the first electrode plate and the second electrode plate changes according to the chest cavity volume change of the subject, and the capacitance changes according to the change of the distance between the first electrode plate and the second electrode plate, Respiratory movement detection method. The method of claim 10, The compressible elastic insulator is any one of paper, fiber, polymer sponge, air gap, Respiratory movement detection method. The method of claim 10, The detecting step, Outputting an oscillation frequency that changes according to the capacitance change; Counting the output oscillation frequency; And Determining a breathing cycle in consideration of the period in which the oscillation frequency is counted Respiratory movement detection method comprising a. The method of claim 10, The detecting step, Outputting an oscillation frequency that changes according to the capacitance change; Converting the output oscillation frequency into a voltage; And Determining a breathing cycle by detecting a zero crossing of the converted voltage Respiratory movement detection method comprising a. The method according to claim 12 or 13, The determining step, When the amount of change in the respiratory cycle that is determined is greater than the upper limit reference value or less than the lower limit reference value, it is determined that a respiratory abnormality has occurred. If it is determined that the breathing abnormality occurs, generating a warning signal informing that the emergency Respiratory movement detection method further comprising.

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