KR20180031991A - Cpr feedback apparatus based on doppler ultrasonography and method thereof - Google Patents

Abstract

The present invention relates to a feedback apparatus for determining whether to properly perform CPR when the CPR is performed on a patient, and a control method thereof. More particularly, the present invention relates to a CPR feedback apparatus including: a CPR sensor unit for sensing whether cardiopulmonary resuscitation (CPR) is performed on the patient, a blood flow rate measuring unit for measuring a blood flow rate of the carotid artery of the patient, a blood oxygen saturation level measuring unit for measuring a blood oxygen saturation level, and a control unit for performing a control operation for measuring the blood flow rate while the CPR is performed based on the sensing result of the CPR sensor unit and measuring the blood oxygen saturation level while the CPR is not performed. Accordingly, the present invention can provide a feedback to a person who performs the CPR.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a CPR feedback device using a Doppler effect of an ultrasonic wave,

The present invention relates to a feedback device capable of determining whether CPR is properly performed based on a Doppler effect of an ultrasonic wave, and a control method thereof.

Cardiopulmonary resuscitation (CPR) is widely known as a first-aid method to revive a person suffering from cardiac arrest. For CPR, repeated chest compressions should be made to allow blood to circulate. Oral ventilation, such as breathing or bag mask devices, is used to supply air to the lungs. When a first-aider presses the chest with the hand, it circulates only 25-30% of the blood in the human body. However, it is difficult for an experienced expert to continue chest compressions for more than a few minutes. Therefore, CPR is not so successful in reviving patients. Nevertheless, by maintaining chest compressions properly, patients with cardiac arrest can be saved for longer.

Failure to perform adequate pressure and adequate depth of CPR may result in blood not being able to flow through important body organs such as the patient's brain, resulting in irreparable damage. In particular, when CPR is performed by a non-practitioner, there is a concern that CPR can be carried out repeatedly because CPR is not sure whether the CPR is performed properly by the non-practitioner, and CPR can be repeatedly performed in an incorrect state . Accordingly, it is essential to provide feedback to the person performing the CPR to inform that the CPR is being performed correctly.

Although various methods have been reviewed to ensure that non-specialists are properly CPRing during CPR, they are less than CPR (100 times per minute, 4 to 5 cm deep), making it somewhat difficult to distinguish between noise and signal.

We are studying how to receive feedback by analyzing data such as brain activation and BIS. However, since this data is a reaction after the influence on the brain, it is difficult to see clearly in real time.

Therefore, it is necessary to make it easy to distinguish the noise due to the fact that it does not overlap with the movement of the CPR much, and research that can receive the feedback of the real time data clearly is required.

The present invention is directed to solving the above-mentioned problems and other problems. Another objective is to provide a method of providing feedback on whether CPR is performed properly.

Another object of the present invention is to provide a structure of an effective ultrasound examination unit for measuring the blood velocity passing through the carotid artery of a subject suffering from CPR.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. It will be possible.

According to an aspect of the present invention, there is provided a CPR sensor unit for detecting whether cardiopulmonary resuscitation (CPR) is being performed on a patient; A blood flow velocity measuring unit for measuring a blood flow velocity of the carotid artery of the patient; A blood oxygen saturation measuring unit for measuring blood oxygen saturation; And a control unit for controlling the blood flow velocity while the CPR is being performed and controlling the blood oxygen saturation to be measured while the CPR is not being performed based on the detection result of the CPR sensor unit .

Here, the CPR feedback device may further include an ultrasound irradiator for irradiating ultrasound waves to the carotid artery of the patient, and the blood flow velocity measuring unit may measure the blood flow velocity using the Doppler effect of the irradiated ultrasound.

The CPR feedback device may further include an output unit for outputting whether or not the CPR is properly performed. The CPR corrects the CPR based on at least one of the measured blood flow velocity and the measured blood oxygen saturation. And outputting the determination result by controlling the output unit.

Further, the CPR feedback device may further include a blood flow direction sensing unit for sensing a blood flow direction of the carotid artery, and the controller may determine whether the CPR is properly performed considering the sensed blood flow direction.

In addition, the blood flow direction sensing unit of the CPR feedback device may include a quadrature demodulator that senses ultrasonic waves reflected from the body of the patient and quadrature demodulates the sensed ultrasonic waves.

In addition, the ultrasound irradiation unit of the CPR feedback apparatus may use a continuous wave (CW) or a pulsed wave (PW).

Also, the CPR feedback device may detect whether the CPR is being performed based on the sensing value of the acceleration sensor.

Further, the control unit of the CPR feedback device estimates a speed or a pressing depth of the CPR performed based on the sensing value of the acceleration sensor, and performs the CPR based on the estimated speed or the pressing depth of the CPR And if it is determined that the CPR is not being properly performed, a warning can be output.

And the blood oxygen saturation can be measured by pulse oximetry.

The blood oxygen saturation may also be measured from at least one of the patient's tongue or earlobe.

According to another aspect of the present invention, there is provided a method for detecting cardiopulmonary resuscitation (CPR) in a patient, Measuring the blood flow velocity of the carotid artery of the patient; Measuring blood oxygen saturation; And measuring the blood flow velocity while the CPR is being performed based on the detection result of the CPR sensor unit and measuring blood oxygen saturation while the CPR is not being performed .

The CPR feedback device may further include a step of irradiating the carotid artery with ultrasound waves, and the measuring step may measure the blood flow velocity using the Doppler effect of the irradiated ultrasound waves.

And controlling the CPR feedback device based on at least one of the measured blood flow velocity and the measured blood oxygen saturation to determine whether the CPR is properly performed. And outputting the determination result by controlling the output unit.

The control method of the CPR feedback device further includes a step of detecting a blood flow direction of the carotid artery, and the step of determining may further include determining whether the CPR is properly performed considering the sensed blood flow direction have.

In this case, the step of sensing the blood flow direction of the carotid artery may include detecting ultrasonic waves reflected back to the body of the patient and quadrature demodulating the sensed ultrasonic waves.

The step of irradiating the ultrasonic wave may use a continuous wave (CW) or a pulsed wave (PW).

The sensing of the control method of the CPR feedback device may include sensing an acceleration through an acceleration sensor and sensing whether the CPR is being performed based on the sensed value of the acceleration sensor .

The sensing of the control method of the CPR feedback device may further include estimating a velocity or a pressing depth of the CPR performed based on the sensed value of the acceleration sensor, Determining whether the CPR is properly performed based on the pressing depth, and outputting a warning if the CPR is not properly performed.

The blood oxygen saturation can be measured by pulse oximetry.

And, the blood oxygen saturation can be measured from at least one of the tongue or ear bone of the patient.

Effects of the CPR feedback device and the control method according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, it is possible to provide feedback to the person performing the CPR whether the CPR is performed properly.

In addition, according to at least one of the embodiments of the present invention, it is advantageous to monitor in real time that CPR is performed properly.

Further scope of applicability of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and specific examples, such as the preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art.

1 is a block diagram of a CPR feedback apparatus 1000 according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a control method of the CPR feedback apparatus 1000 control unit 1700 according to an embodiment of the present invention.
3 is a view showing a structure of an ultrasound irradiation unit 300 according to an embodiment of the present invention.
4 is a view showing an application state of the ultrasonic irradiation unit 300 according to an embodiment of the present invention.
FIG. 5 (a) is a graph showing the result of analyzing the blood flow velocity of about 20 seconds, and FIG. 5 (b) is the result of analyzing the blood flow velocity of about 30 minutes.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The ultrasound diagnostic apparatus irradiates an ultrasound signal generated from a transducer of a probe to a target object, receives information of an echo signal reflected from the target object, and transmits the echo signal to a site (e.g., soft tissue or blood stream) To obtain at least one image. In particular, the ultrasonic diagnostic apparatus is used for medical purposes such as observation of an object, foreign object detection, and injury measurement. Such an ultrasonic diagnostic apparatus is more stable than a diagnostic apparatus using X-ray, has an advantage that it can display images in real time, and is safe because there is no radiation exposure. Accordingly, the ultrasonic diagnostic apparatus is widely used with other imaging apparatuses including a computed tomography (CT) apparatus, a magnetic resonance imaging (MRI) apparatus, and the like. In the present invention, the velocity of blood passing through the carotid artery is determined using the Doppler effect of ultrasonic waves, and the CPR is used as feedback.

1 is a block diagram of a CPR feedback apparatus 1000 according to an embodiment of the present invention.

The CPR feedback apparatus 1000 according to an embodiment of the present invention includes a probe 20, an ultrasonic transmission and reception unit 1100, an image processing unit 1200, a display 1400, a memory 1500, an input device 1600, An output unit 1900, and a control unit 1700, and the various configurations described above may be connected to each other via a bus 1800. [ It will be understood by those skilled in the art that other general-purpose components other than the components shown in FIG. 1 may be further included.

The probe 20 transmits an ultrasonic signal to the object 10 in response to a driving signal applied from the ultrasonic transmitting and receiving unit 1100 and receives an echo signal reflected from the object 10. The probe 20 includes a plurality of transducers, and the plurality of transducers generate ultrasonic waves that are vibrated according to an electrical signal to be transmitted and are acoustical energy. The probe 20 may be connected to the main body of the CPR feedback apparatus 1000 in a wired or wireless manner and the CPR feedback apparatus 1000 may include a plurality of probes 20 according to an embodiment.

The transmission unit 1110 supplies a driving signal to the probe 20 and includes a pulse generation unit 1112, a transmission delay unit 1114, and a pulsar 1116. The pulse generator 1112 generates a pulse for forming a transmission ultrasonic wave according to a predetermined pulse repetition frequency (PRF), and the transmission delay unit 1114 determines a transmission directionality And applies the delay time to the pulse. Each of the pulses to which the delay time is applied corresponds to a plurality of piezoelectric vibrators included in the probe 20, respectively. The pulser 1116 applies a driving signal (or a driving pulse) to the probe 20 at a timing corresponding to each pulse to which the delay time is applied.

Meanwhile, in the above-described embodiment, the beam forming is performed using the plurality of probes 20 and the ultrasound image is generated through the image processing unit 1200 described later. However, in another embodiment, , It is obvious that the flow (velocity or direction) of the blood flow can be determined without generating the ultrasound image. That is, in this embodiment, the ultrasound image processing by the image processing unit 1200 may be unnecessary, and accordingly, the image processing unit 1200 may not be an essential configuration. It is obvious that unnecessary configuration can be omitted in the ultrasonic transmitting and receiving unit 1100 when ultrasonic waves are irradiated using the single probe 20. [ For example, the transmission delay unit 1114 and the reception delay unit 1126 for beamforming may be omitted when the single probe 20 is used.

The receiving unit 1120 processes the echo signal received from the probe 20 to generate ultrasonic data and includes an amplifier 1122, an ADC (Analog Digital Converter) 1124, a receiving delay unit 1126, And a summing unit 1128. [ The amplifier 1122 amplifies the echo signal for each channel, and the ADC 1124 converts the amplified echo signal analog-to-digital. The reception delay unit 1126 applies the delay time for determining the reception directionality to the digitally converted echo signal and the summation unit 1128 sums the echo signals processed by the reception delay unit 1126 And generates ultrasonic data. Meanwhile, the receiving unit 1120 may not include the amplifier 1122 according to the embodiment. That is, when the sensitivity of the probe 20 is improved or the processing bit number of the ADC 1124 is improved, the amplifier 1122 may be omitted.

The image processing unit 1200 generates and displays an ultrasound image through a scan conversion process on the ultrasound data generated by the ultrasound transmission / reception unit 1100. On the other hand, the ultrasound image has a Doppler effect as well as an image of a gray scale obtained by scanning an object in an A mode (amplitude mode), a B mode (brightness mode) and an M mode And may be a Doppler image expressing a moving object by using it. The Doppler image may be a blood flow Doppler image (also referred to as a color Doppler image) representing blood flow, a tissue Doppler image representing tissue movement, or a spectral Doppler image representing a moving velocity of a subject by a waveform.

Doppler refers to a method and technique for analyzing a waveform. When a probe approaches or approaches a reference point, it senses a change in the frequency of the waveform and analyzes the waveform to detect the velocity of the blood flow or determine the direction of the blood flow. It says. The amplitude of the waveform decreases when it is away from the probe, and the amplitude of the waveform increases when it gets closer. This phenomenon is also related to the Doppler effect.

Doppler imaging means imaging and analyzing the waveform changes on a two-dimensional plane. In an embodiment of the present invention, the Doppler image may be used for analysis. However, in another embodiment, only the single probe 20 may be used to determine whether the CPR is properly performed You can judge.

The B mode processing unit 1212 extracts and processes the B mode component from the ultrasonic data. The image generating unit 1220 can generate an ultrasound image in which the intensity of the signal is expressed by the brightness based on the B mode component extracted by the B mode processing unit 1212. [

Similarly, the Doppler processing unit 1214 extracts a Doppler component from the ultrasound data, and the image generating unit 1220 can generate a Doppler image that expresses the motion of the object in a color or a waveform based on the extracted Doppler component.

The image generating unit 1220 may generate a 3-dimensional ultrasound image through a volume rendering process on volume data, and may generate an elastic image that imaged the degree of deformation of the object 10 according to the pressure It is possible. Further, the image generating unit 1220 may display various kinds of additional information on the ultrasound image in text and graphics. Meanwhile, the generated ultrasound image may be stored in the memory 1500.

The display unit 1400 displays and outputs the generated ultrasound image. The display unit 1400 can display various information processed by the CPR feedback apparatus 1000 on a screen through a GUI (Graphical User Interface) as well as an ultrasound image. Meanwhile, the CPR feedback apparatus 1000 may include two or more display units 1400, depending on the implementation.

The display unit 1400 may be a liquid crystal display, a thin film transistor-liquid crystal display, an organic light-emitting diode, a flexible display, a three-dimensional display A 3D display, and an electrophoretic display.

In addition, when the display unit 1400 and the user input unit have a layer structure and a touch screen, the display unit 1400 may be used as an input device capable of inputting information by a user's touch in addition to the output device.

The touch screen can be configured to detect the touch input position as well as the touch area as well as the touch pressure. In addition, the touch screen can be configured to detect not only a real-touch but also a proximity touch.

In the present specification, the term "real-touch" refers to a case where a pointer is actually touched on the screen, and "proximity-touch" And is a predetermined distance away from the screen. In this specification, a pointer refers to a touch tool for touching or touching a specific portion of a displayed screen. Examples include electronic pens and fingers.

Although not shown in the figure, the CPR feedback device 1000 may include various sensors inside or near the touch screen to detect a direct touch or a proximity touch to the touch screen. An example of a sensor for sensing the touch of the touch screen is a tactile sensor.

A tactile sensor is a sensor that detects the contact of a specific object with a degree or more that a person feels. The tactile sensor can detect various information such as the roughness of the contact surface, the rigidity of the contact object, and the temperature of the contact point.

In addition, a proximity sensor is an example of a sensor for sensing the touch of the touch screen. The proximity sensor refers to a sensor that detects the presence or absence of an object approaching a predetermined detection surface or a nearby object without mechanical contact using the force of an electromagnetic field or infrared rays.

Examples of proximity sensors include a transmission type photoelectric sensor, a direct reflection type photoelectric sensor, a mirror reflection type photoelectric sensor, a high frequency oscillation type proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor.

At this time, the CPR feedback apparatus 1000 according to an exemplary embodiment may display a control panel for an ultrasound image and an ultrasound image in a predetermined mode on a touch screen. The CPR feedback device 1000 can sense the user's touch gesture with respect to the ultrasound image through the touch screen.

The CPR feedback apparatus 1000 according to an exemplary embodiment may physically include some buttons frequently used by the user among the buttons included in the control panel of the general ultrasonic apparatus and the remaining buttons may be displayed in a GUI (Graphical User Interface) Can be provided through a touch screen.

The memory 1500 stores various pieces of information to be processed in the CPR feedback apparatus 1000. For example, the memory 1500 may store medical data related to diagnosis of a target object such as input / output ultrasound data and ultrasound images, and may store an algorithm or a program executed in the CPR feedback device 1000.

The memory 1500 may be implemented by various types of storage media such as a flash memory, a hard disk, and an EEPROM. The CPR feedback apparatus 1000 may also operate a web storage or a cloud server that performs storage functions of the memory 1500 on the web.

The input device 1600 means a means for receiving data for controlling the CPR feedback device 1000 from the user. Examples of the input device 1600 may include a hardware configuration such as a keypad, a mouse, a touchpad, a touch screen, a trackball, a jog switch, etc., but the present invention is not limited thereto. And may further include various input means such as a recognition sensor, a fingerprint recognition sensor, an iris recognition sensor, a depth sensor, and a distance sensor.

Particularly, in one embodiment of the present invention, it is proposed to further include an acceleration sensor. It is to judge whether CPR is performed by using acceleration sensor. Hereinafter, a method of utilizing the acceleration sensor will be described in more detail.

The control unit 1700 controls the operation of the CPR feedback apparatus 1000 as a whole. That is, the control unit 1700 controls the operation between the probe 20, the ultrasonic transmission / reception unit 1100, the image processing unit 1200, the display unit 1400, the memory 1500, and the input device 1600 shown in FIG. Can be controlled.

The sound output unit 1900 may output a warning notification to a user (a person who performs CPR) when the CPR is not properly performed according to an embodiment of the present invention. The sound output unit 1900 may also output a warning notification based on the control signal from the control unit 1700. The alarm output in steps S205, S208, and S211 may be performed by the sound output unit 1900 It is self-evident.

Meanwhile, the sound output unit 1900 of the present invention has a structure capable of outputting at least two kinds of sounds according to the CPR state. One is a warning sound to inform that the sound that is moved to the audio frequency band and the abnormal CPR are being performed so that the velocity and direction of the blood flow can be heard as a result of the Doppler.

In addition, the sound output unit 1900 according to an embodiment of the present invention may be provided with two loudspeakers for separating and listening to the direction of blood flow.

For example, the sound output unit 1900 may include at least two loudspeakers for producing a sound with a variation in blood flow velocity in each direction, and may output the direction and velocity of blood flow. The user may be able to output the warning sound (abnormal CPR notification). In such an embodiment, the CPR performer can determine whether the CPR is normally performed and whether the direction of the blood flow is correct, without the display 1400 alone.

It is obvious that one speaker can be used when the direction is not separated.

On the other hand, in the embodiment including only the sound output unit 1900 without the display 1400, there is no need to construct an ultrasound image. Therefore, the direction and velocity of the blood flow are determined using only the single probe 20 as described above, You will be able to generate a beep for.

Some or all of the probe 20, the ultrasonic transmission / reception unit 1100, the image processing unit 1200, the display unit 1400, the memory 1500, the input device 1600 and the control unit 1700 may be operated by a software module But not limited thereto, and some of the above-described configurations may be operated by hardware. At least some of the ultrasonic transmission / reception unit 1100 and the image processing unit 1200 may be included in the control unit 1600, but the present invention is not limited to this embodiment.

Various methods have been studied to determine whether CPR is being performed properly. One of them uses EtCO ₂ (end-tidal CO ₂ , end-tidal CO2 partial pressure) or a method of measuring respiration.

However, EtCO ₂ is the concentration of carbon dioxide in the respiration, which can be a measure of the state after it has been affected, not the current state. Therefore, EtCO ₂ is insufficient for information on real-time conditions, and it can not be said to be accurate data because it minimizes the function of the organ when oxygen is lacking in the brain.

In addition, respiration has a disadvantage that it is difficult to distinguish it from noise when CPR is used because the movement of the chest wall caused by respiration is smaller than the motion of CPR. In addition, data such as brain activation and BIS are responses after the brain is affected.

Various imaging devices are used to non-invasively observe the inside of the human body. In particular, ultrasound images are widely used because they are more stable than other images using X-rays and safe because there is no fear of radiation exposure. The ultrasound diagnostic apparatus irradiates an ultrasound signal generated from a transducer of a probe to a target object, receives information of an echo signal reflected from the target object, and obtains an image of a site inside the target object. In particular, the ultrasonic diagnostic apparatus is used for medical purposes such as observation of an object, foreign object detection, and injury measurement.

In one embodiment of the present invention, the ultrasonic wave is irradiated to the patient's carotid artery, and the velocity of the blood flow passing through the carotid artery is ascertained by using the reflected ultrasonic wave to suggest whether the CPR is properly performed. In other words, it is proposed to use the velocity of blood flow ascending in the carotid artery as a feedback index to judge whether CPR is properly performed.

In one embodiment, the Doppler effect of the ultrasonic wave is used to determine the blood flow velocity.

In addition, the shape, structure, and material of the most effective ultrasonic probe are proposed for these embodiments. Hereinafter, a detailed description will be given with reference to the drawings.

FIG. 2 is a flowchart illustrating a control method of the CPR feedback apparatus 1000 control unit 1700 according to an embodiment of the present invention.

In step S201, the controller 1700 may determine whether the CPR is in progress based on the sensing value sensed by the acceleration sensor. At this time, the progress of the CPR may be performed by a person (a medical professional or an untrained person), but it is also possible to detect that CPR is performed using an automated CPR machine (hereinafter referred to as an ACM device).

In an embodiment of the present invention, it is proposed to determine the feedback signal by distinguishing between CPR and non-CPR. This is because, when the CPR is in progress, it is necessary to effectively remove the noise caused by the CPR. In this case, steps S203 to S209 may be performed. On the other hand, since there is no noise that may be caused by the CPR itself when the CPR is not in progress (for example, when a certain number of cardiac compressions are interrupted for a certain period of time, etc.) (Steps S206 to S208). Hereinafter, a method of dividing according to the result determined in step S202 will be described in detail.

In step S202, the process proceeds to step S203 or step S206 according to the determination result in step S201. That is, if the CPR is in progress, the process may proceed to step S203, and if the CPR is not in progress, the process may proceed to step S206.

In step S203, the control unit 1700 can determine the pressing speed or the pressing depth of the CPR. At this time, the determination of these may be made based on the value of the acceleration sensor measured in step S201. And, the acceleration sensor may be provided at a specific part of the body part of the patient, for example, the acceleration sensor may be located on the heart pressing part of the patient.

In step S204, the controller 1700 determines whether the determined pressing speed or pressing depth is appropriate. If not, the flow advances to step S205 to output a warning indicating that the CPR is not properly performed.

If it is appropriate, the flow rate and / or the blood flow direction may be measured in step S209. The control unit 1700 may further include a blood flow velocity sensing unit 1701 and a blood flow direction sensing unit 1702 to sense the blood flow velocity and / or blood flow direction.

In addition, it may be possible to measure the blood flow velocity and / or the blood flow direction in step S209 after outputting the warning in step S205.

In general, the blood flow velocity of the artery (carotid artery) ascending to the brain is 10 cm ~ 40 cm per second (Max 230 cm / min). If the brain pressure rises in a condition such as brain death, the blood flow velocity may be reversed. This speed will be somewhat differentiated by using a filter because the frequency band does not overlap much with the CPR movement. That is, the controller 1700 may filter the ultrasound signals reflected from the patient's body, and determine whether the blood flow velocity is in the correct direction or the reverse direction based on the filtering result. In particular, although it has been described that the blood flow velocity and the blood flow direction are determined by individual methods, it may be possible to grasp the blood flow velocity and the blood flow direction at the same time as the color Doppler image analysis.

Specifically, as described above, the blood flow velocity sensing unit may utilize the Doppler effect of ultrasonic waves. The blood flow direction sensing unit may include a quadrature demodulator and may quadrature demodulate the ultrasonic wave to determine the direction of the blood flow.

In step S210, it is determined whether the measurement result in step S209 is normal. If the measurement result is abnormal, the flow advances to step S201. If the measurement result is abnormal, the flow advances to step S211 to output a warning that the CPR is not normal.

In step S206, blood oxygen saturation is measured. The measured blood oxygen saturation may be SpO _{2 as} measured by pulse oximetry. Then,% SPO ₂ and / or PR (pulse rate) shown in% of this is measured and it is judged whether or not it is normal. If it is not normal, the process proceeds to step S208, and an alarm can be outputted for the abnormality. If it is normal, the process can proceed to step S209.

The output of the above-described warning may output a phrase or image that can be guided to the user through the display unit 1400, but may output a warning through vibration or audio output when the display unit 1400 is not present It is obvious.

Meanwhile, in an embodiment of the present invention, ultrasound is used to measure blood flow velocity and blood flow direction during CPR progression. However, with conventional ultrasound probes, it would be difficult to measure the blood flow of the carotid artery during a violent CPR. Accordingly, in one embodiment of the present invention, a structure of an ultrasound irradiation unit capable of irradiating ultrasound during CPR progression is proposed.

This structure will be described with reference to FIGS. 3 and 4. FIG.

3 is a view showing a structure of an ultrasound irradiation unit 300 according to an embodiment of the present invention. 4 is a view showing an application state of the ultrasonic irradiation unit 300 according to an embodiment of the present invention.

Fig. 3 (a) is a plan view and Fig. 3 (b) is a side view. 3, the ultrasound irradiation unit 300 may include a body 301, a transducer 302, and a protrusion 303 provided at the tip of the body 301.

The probe may be positioned at the tip of the protrusion 303 and the protrusion 303 may be formed to surround the probe 302 in a U shape.

The protruding jaw 303 may protrude higher than the probe 302 so as to be easily fixed to the carotid artery position of the patient.

In an embodiment of the present invention, the body 301 is made of a gel-type material. Referring to FIG. 4, not only the probe 302 should be positioned at the carotid artery position 402 of the patient 401, but the probe 302 should also be fixed at the same position even when performing severe CPR. 4 (b), a body 301 made of a gel-type material is in close contact with the neck 401 of the patient 401, and the protruding jaws 303 position the carotid artery position 402 ), It can be fixed at the position even in the case of performing severe CPR. In particular, in one embodiment of the present invention, the protruding jaw 303 is integrally formed with the main body 301 and is made of a gel-type material, and can be adhered or adhered when adhered to the skin of the patient 401 There will be.

Referring to FIG. 5, an experimental result of measuring blood flow velocity to the carotid artery when performing CPR to a pig using ultrasound using the ultrasound irradiation unit 300 according to an embodiment of the present invention will be described.

FIG. 5 (a) is a graph showing the result of analyzing the blood flow velocity of about 20 seconds, and FIG. 5 (b) is the result of analyzing the blood flow velocity of about 30 minutes.

Referring to FIG. 5 (a), the CPR was stopped at the point of time 36 minutes 28 seconds (501), and as a result, the blood flow velocity to the brain did not appear. Then, the CPR was restarted at a time point of 36 minutes 37 seconds (502). As a result, the blood flow velocity to the brain was repeated at a constant cycle. At this time, a certain period will coincide with the compression period when performing CPR. Based on these results, it can be concluded that CPR can be confirmed by measuring blood flow ascending to the brain.

In particular, the present invention proposes to determine the blood flow velocity in order to determine whether CPR is being performed at an appropriate pressure and depth.

FIG. 5 (b) is a diagram showing results of repeated normal CPR and abnormal CPR for 30 minutes. Normal CPR means CPR which repeatedly performs normal pressure depth, normal pressure rate, etc., and abnormal CPR indicates that when the compression depth is insufficient or too high, when the compression speed is slow or fast (that is, Short or too long).

Referring to FIG. 5 (b), in the case of normal CPR, the amplitude at which the blood flow velocity graph oscillates is relatively large, and in the case of abnormal CPR, the amplitude at which the graph oscillates is relatively small. Therefore, this distinction can be judged based on whether the magnitude of the amplitude exceeds a predetermined magnitude. Or, if the amplitude is too large, it may be determined that it is compressing too fast or too deep, so it may be possible to set a lower bound and an upper bound on the normal CPR amplitude range. Specifically, when the amplitude is larger than the first value and smaller than the second value in the blood flow graph, it can be judged that the CPR is normally performed.

Meanwhile, in one embodiment of the present invention, a CW (continuous wave) for continuously irradiating the irradiated ultrasonic waves or a PW (Pulsed wave) type having a specific irradiation period may be included.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, The scope of the technical idea of the present invention is not limited by the description with reference to the drawings or the drawings. It will also be appreciated by those skilled in the art that the concepts and embodiments of the invention set forth herein may be used as a basis for modifying or designing other structures for carrying out the same purposes of the present invention It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents. And various changes, substitutions, and alterations can be made without departing from the scope of the invention.

Claims (20)

A CPR sensor unit for detecting whether the patient is performing cardiopulmonary resuscitation (CPR);
A blood flow velocity measuring unit for measuring a blood flow velocity of the carotid artery of the patient;
A blood oxygen saturation measuring unit for measuring blood oxygen saturation; And
And a control unit for controlling the blood flow rate while the CPR is being performed based on the detection result of the CPR sensor unit and measuring the oxygen saturation of the blood while the CPR is not being performed,
CPR feedback device. The method according to claim 1,
Further comprising an ultrasonic irradiator for irradiating ultrasonic waves to the carotid artery of the patient,
Wherein the blood flow velocity measuring unit measures the blood flow velocity using the Doppler effect of the irradiated ultrasonic waves,
CPR feedback device. The method according to claim 1,
Further comprising an output unit for outputting whether the CPR is being performed properly,
Wherein,
Determining whether the CPR is properly performed based on at least one of the measured blood flow velocity and the measured blood oxygen saturation,
And outputting the determination result by controlling the output unit,
CPR feedback device. The method of claim 3,
And a blood flow direction sensing unit for sensing a blood flow direction of the carotid artery,
Wherein the controller determines whether the CPR is properly performed considering the sensed blood flow direction,
CPR feedback device. [5] The apparatus according to claim 4,
And a quadrature demodulator for detecting ultrasonic waves reflected from the body of the patient and returning the detected ultrasonic waves to a quadrature demodulator.
CPR feedback device. The method according to claim 1,
The ultrasound irradiator may be a continuous wave (PW) or a pulsed wave (PW)
CPR feedback device. 2. The apparatus of claim 1, wherein the CPR sensor unit
An acceleration sensor,
Detecting whether the CPR is being performed based on the sensed value of the acceleration sensor,
CPR feedback device. 8. The method of claim 7,
The control unit estimates the speed or the pressing depth of the CPR performed based on the sensing value of the acceleration sensor,
Determines whether the CPR is being properly performed based on the estimated CPR speed or the compressed depth,
And to output a warning when the CPR is not being performed properly,
CPR feedback device. The method according to claim 1,
Characterized in that the blood oxygen saturation is measured by pulse oximetry.
CPR feedback device. 10. The method of claim 9,
Wherein the blood oxygen saturation is measured from at least one of the tongue or earlobe of the patient,
CPR feedback device. Detecting whether the patient is performing cardiopulmonary resuscitation (CPR);
Measuring the blood flow velocity of the carotid artery of the patient;
Measuring blood oxygen saturation; And
Measuring blood flow velocity while CPR is being performed and measuring blood oxygen saturation while CPR is not being performed based on the detection result of the CPR sensor unit;
A method of controlling a CPR feedback device. 12. The method of claim 11,
And irradiating ultrasonic waves to the carotid artery,
Wherein the measuring step measures the blood flow velocity using the Doppler effect of the irradiated ultrasonic waves,
A method of controlling a CPR feedback device. 13. The method of claim 12,
Determining whether the CPR is properly performed based on at least one of the measured blood flow velocity and the measured blood oxygen saturation; And
Further comprising: controlling the output unit to output the determination result.
A method of controlling a CPR feedback device. 14. The method of claim 13,
Further comprising the step of sensing blood flow direction of the carotid artery,
Wherein the determining step further includes determining whether the CPR is properly performed considering the sensed blood flow direction,
A method of controlling a CPR feedback device. 15. The method of claim 14, wherein the step of sensing blood flow direction of the carotid artery comprises:
Detecting a returning ultrasonic wave to the body of the patient and quadrature demodulating the sensed ultrasonic wave;
A method of controlling a CPR feedback device. 13. The method of claim 12,
The step of irradiating the ultrasonic wave may be a continuous wave (PW) or a pulsed wave (PW)
A method of controlling a CPR feedback device. 12. The method of claim 11,
Sensing an acceleration through an acceleration sensor,
Detecting whether the CPR is being performed based on the sensed value of the acceleration sensor,
A method of controlling a CPR feedback device. 18. The method of claim 17,
Estimating a speed or a pressing depth of the CPR to be performed based on the sensing value of the acceleration sensor,
Determines whether the CPR is being properly performed based on the estimated CPR speed or the compressed depth,
And outputting a warning if the determined CPR is not being performed properly.
A method of controlling a CPR feedback device. 12. The method of claim 11,
Characterized in that the blood oxygen saturation is measured by pulse oximetry.
A method of controlling a CPR feedback device. 20. The method of claim 19,
Wherein the blood oxygen saturation is measured from at least one of the tongue or earlobe of the patient,
A method of controlling a CPR feedback device.

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