KR100383459B1 - Apparatus for measuring accelerated plethymogram - Google Patents

Abstract

The present invention provides an acceleration pulse wave measuring device for measuring the acceleration pulse wave by converting the reflected pressure of the pulse wave transmitted to the cardiovascular into an electrical signal.

Such a device is composed of a pressure sensor (S), an amplifier (A), a filter (F), wherein the pressure sensor (S) is a silicone rubber (1, 1a) for the platen, dynamic pressure sensing ceramic (2) , The reference pressure plate 3, the sensor accommodating portion (4, 4a), the dynamic pressure output unit 9 and the reference pressure output unit 10, characterized in that comprises a pressurized rubber It includes a fixing portion 7 and the sensor mounting wrist belt (8).

The effect of the present invention is to obtain a sufficient acceleration pulse wave only by the pressure sensor (S) in the stable state, and in the dynamic state by including the amplifier (A) and the filter (F) to eliminate the noise mixed In this state, the acceleration pulse wave required for diagnosis can be obtained by changing the flow of peripheral blood volume into an electrical signal. Furthermore, the device is an effective device that can obtain pulse information for a long time as well as a short time even with a simple structure.

Description

Accelerated pulse wave measuring device {Apparatus for measuring accelerated plethymogram}

The present invention relates to an apparatus for measuring an acceleration pulse wave, and more particularly, to a pulse wave sensor for monitoring a change in blood volume, ie, a peripheral circulation blood volume, from a finger to a toe or a wrist.

In general, pulse wave monitors changes in hemoglobin levels in peripheral parts such as the fingertips and in arteries of the wrist using a dual absorption photoelectric sensor. This pulse wave is called in other words the suppository volume pulse wave. Acceleration pulse wave is obtained by the second derivative of the volumetric pulse wave, and it is known that the abnormality of the cardiovascular system can be diagnosed by analyzing the pattern of the acceleration pulse wave.

The usefulness of the acceleration pulse wave is easy to measure the pulse wave on which it is based, and it contains abundant cardiovascular information.In general, the acceleration pulse wave of one cycle includes the initial positive wave, the acoustic wave, the re-elevation wave, and the descending wave. It consists of parts. By analyzing the ratio of the four parts of the acceleration pulse wave, it is known to predict atherosclerosis and potential heart failure. In addition, unlike the volumetric pulse wave, the acceleration pulse wave has a peak value other than high resolution, so accurate heart rate can be estimated. Conventionally, although there is a method of obtaining peak values of an electrocardiogram in order to measure a continuous accurate heart rate, it is not simple. Conventionally, there has been a type of fastening the belt to the fingertips, but in the case of peripheral vascular disorders, long-term monitoring causes vascular disorders. In addition, these disorders eventually attenuate the magnitude of the pulse wave, making the waveform distorted despite the absence of physiological changes, making it impossible to measure the continuous acceleration pulse wave.

Conventionally, velocity pulse waves are obtained by firstly calculating the volume pulse waves. Differentiating this velocity pulse wave once again yields an acceleration pulse wave. When using a light absorbing sensor or an ultrasonic sensor to configure the measuring device, in the dynamic state of severe shaking of the hand such as elderly people or peripheral neuropathy, severe distortion of the waveform occurs and a separate complicated filter circuit or Requires software Although it is ideal to use a piezoelectric pulse wave meter, blood flow disorders or peripheral vascular contraction disorders occur when a long pressurization is performed to obtain a reflex pressure of arterial pressure. In addition, since the continuous and prolonged acceleration pulse wave is a basic signal for measuring heart rate variability, arterial pressure change, and changes in biorhythm and autonomic nerve activity, a device for causing such peripheral vasoconstriction disorders is undesirable.

Therefore, accurate measurement of heart rate variability and autonomic nerve activity is very important for diagnosis, prediction, and prevention of heart disease, and a simple measuring method and device for such heart activity are needed. In view of the above, the object of the present invention is to obtain an acceleration pulse wave measuring device that can easily obtain the acceleration pulse wave by converting the pressure signal caused by the activity of the heart pulsation on the finger and toe tip or the peripheral blood vessel surface on the wrist into an electrical signal. To provide.

That is, an object of the present invention is to develop an apparatus for extracting an acceleration pulse wave by changing an arterial reflex pressure of a peripheral blood vessel region into an electrical signal.

1 is a block diagram showing an acceleration pulse wave measuring apparatus according to the present invention.

Figure 2 shows a piezoelectric piezoelectric sensor for obtaining the acceleration pulse wave according to the present invention, Figure 2a is a plan view showing a dynamic pressure output unit and a reference pressure output unit together with the reference pressure plate and the dynamic pressure sensing ceramics, Figure 2b is a finger It is sectional drawing which shows the structure of the acceleration pulse wave measuring apparatus for a toe, FIG. 2C is sectional drawing which shows the structure of the acceleration pulse wave measuring apparatus for wrists.

3A and 3B are waveform diagrams comparing an example of an acceleration pulse wave and a conventional volume pulse wave according to the present invention.

<Description of the symbols for the main parts of the drawings>

1,1a: Silicone rubber for platen 2: Dynamic pressure sensing ceramic

3: reference pressure plate 4,4a: sensor housing

5: pressure spring 6: silicone rubber for pressure

7: Pressurized rubber fixing part 8: Wrist belt with sensor

9: dynamic pressure output 10: reference pressure output

S: Pressure sensor part A: Amplification part

F: filter part

Acceleration pulse wave measuring apparatus according to an embodiment of the present invention to obtain the information of the change of the peripheral blood flow and pulsation of the finger and toe end to achieve the above object as a silicon rubber, piezoelectric type dynamic pressure sensing ceramic, It is configured to include a dynamic pressure output unit and a reference pressure output unit, in the dynamic state is configured to include an amplification unit and a filter unit is characterized in that the acceleration pulse wave is measured by converting the mechanical pressure transmitted from the cardiovascular to an electrical signal.

In addition, the acceleration pulse wave measuring apparatus according to another embodiment of the present invention, the heart rate information through the arterial vessels of the wrist and the information about the change in the activity of the cardiac autonomic nerve as a platen rubber, piezoelectric pressure sensor, sensor It is configured to include a mounting wrist belt, dynamic pressure output unit and the reference pressure output unit, it is characterized by being configured to include an amplification unit and a filter unit can measure the accurate acceleration pulse wave even in a dynamic state.

Conventionally, a dual absorption sensor is used to obtain a volume pulse wave, and since the electrical signal converted through the dual absorption sensor is very small, it is amplified using an amplification circuit and a filtering circuit and a differential circuit for processing baseline shaking and the like. The acceleration pulse wave is finally obtained through the dual absorbance sensor, the amplification circuit, and the differential circuit. Therefore, the acceleration pulse wave is obtained through the double absorption sensor, the amplification circuit, and the differential circuit. In case of moving or moving, there is a problem of low reproducibility in spite of the same subject, and there is also a lot of concern about complexity and distortion that constitutes many circuits until measurement and recording is easy but the final acceleration pulse wave is obtained. However, in the present invention, in order to solve this problem, there is no baseline fluctuation and the frequency band is fixed so that no filtering circuit is required. It is composed of a high sensitivity piezoelectric piezoelectric sensor. In addition, the present invention is configured so that the acceleration pulse wave can be easily obtained by adding a simple medium width circuit and a filter circuit even in a dynamic state.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

An example of the configuration of the present invention, as shown in the block diagram of Fig. 1 comprises a piezoelectric pressure sensor unit (S) for detecting a fine reflection pressure of the arterial pressure occurring in the cardiovascular system, through the pressure sensor unit (S) peripheral The reflex pressure of the vascular system is converted into an electrical signal. The electrical signal is fine and can be measured in a stable state, but when the original signal is severely attenuated when a body shake or electrical noise is applied, the amplification part A is included to amplify the signal. In addition, by including the filter unit F such as a band pass filter circuit, only signals of a required frequency band (30 to 500 kHz) are extracted. In detail, the detailed configuration and structure of the piezoelectric piezoelectric sensor S is shown in FIGS. 2A, 2B, and 2C. FIG. 2B shows a configuration of an acceleration pulse wave measuring device for fingers to toes, and FIG. 2C shows a configuration of a belt type pulse wave measuring device mounted on the arterial surface of the wrist.

Specifically, in FIG. 2B, the finger to toe pressure sensor unit S according to the present invention includes a platen-based silicone rubber 1 for transmitting a pulsating reflection pressure, and a platen-based silicone rubber 1 through a cardiovascular system. Dynamic pressure sensing ceramic (2) and reference pressure plate (3), the sensor receiving portion (4) for receiving the dynamic pressure detection ceramic (2) and reference pressure plate (3) for detecting the pulsation transmitted through the contraction, and the reflection of the artery It comprises a pressing means for pressing the finger or the toe on the opposite side of the platen-use silicone rubber to obtain the pressure, the pressing means, the finger or toe band, or as shown in Figures 2a and 2b Pressing a finger or a toe to obtain a reflection pressure of an artery at one end of the pressure spring 5 installed at the sensor accommodating part 4 or the reference plate 3, and at the opposite side of the platen silicone rubber 1. Pressurized silicone rubber for (6) and the pressurized silicone rubber (6), and may be composed of a pressurized rubber fixing part (7) installed at the other end of the press spring (5). The dynamic pressure sensing ceramic 2 and the reference pressure plate 3 are provided with a dynamic pressure output unit 9 and a reference pressure output unit 10 for outputting the sensed and converted electrical signals as shown in FIG. 2A.

Also, in FIG. 2C, the pressure sensor S of the accelerometer pulse wave measuring apparatus for wrists uses a platen-use silicon rubber 1a that transmits the pulsating reflection pressure and the platen-type silicon rubber 1a similarly to that of FIG. Dynamic pressure sensing ceramic (2) and reference pressure plate (3) for detecting pulsation transmitted through the cardiac blood through the sensor receiving portion (4a) for receiving the dynamic pressure detection ceramic (2) and reference pressure plate (3) 2B, a wrist belt 8 for fixing the sensor accommodating part 4a and applying a pressing force instead of the pressure spring 5, the pressure silicone rubber 6, and the pressure rubber fixing part 7 of FIG. As shown in FIG. 2A, the apparatus includes a dynamic pressure output unit 9 and a reference pressure output unit 10 for outputting the dynamic pressure and the reference pressure by changing electrical signals.

3A is one example of the acceleration pulse wave extracted by sensing the reflected pressure transmitted from the cardiovascular system by the piezoelectric sensor of FIG. 2. This acceleration pulse wave has been confirmed to have the same shape as the acceleration signal obtained by differentially capturing the volume pulse wave (FIG. 3B) simultaneously measured by a conventional optical sensor. It can be seen from FIG. 3A and FIG. 3B that the peak value interval PI of the acceleration pulse wave is clearly in agreement with the phase difference SI of the volume pulse wave. The device of the present invention may be a finger, a toe tip, and a wrist as a mounting place. In particular, since the acceleration pulse wave obtained from the pressure sensor installed on the wrist can be easily measured even in daily life, the basic signal that can measure the change of biorhythm and autonomic nerve activity of the day from heart rate fluctuation information obtained from such pulse wave is provided. Can be.

As described above, the present invention realizes a piezoelectric acceleration pulse wave measuring apparatus that can easily measure the acceleration pulse wave, and the piezoelectric acceleration pulse wave of the present invention can be used without any obstacles or distortions even for long time monitoring.

In particular, the stable posture pulse wave does not require a separate amplification circuit and a filter circuit, so the configuration is simpler, and the piezoelectric acceleration pulse wave is effective in continuous heart rate extraction because the peak value is clear unlike the volume pulse wave. Poetry has the effect that it can be used as a basic signal to simply calculate autonomic activity.

Claims (2)

It is possible to obtain information about changes in peripheral blood flow and pulsation at the tip of a finger or toe, and detects pulsations that are contracted and transmitted through cardiac blood through the platen silicone rubber that delivers the pulsating reflex pressure and the platen silicone rubber. Piezoelectric type dynamic pressure sensing ceramic for outputting the electrical signal of the dynamic pressure through the dynamic pressure output part, the reference plate for fixing the electrical signal of the reference pressure through the reference pressure output part, which is fixed at the outer periphery of the sensor accommodating part, and the reflected pressure of the artery. Comprising a pressing means for pressing the finger or toes on the opposite side of the platen-use silicone rubber to obtain a, an amplifying unit and a predetermined frequency band for amplifying the electrical signal attenuated in a dynamic state (30) Group that is delivered from the cardiovascular system by including a filter unit for extracting only a signal of Acceleration pulse wave measuring apparatus for measuring the acceleration pulse wave by converting the system pressure into an electrical signal. Heart rate information through the arterial blood vessels of the wrist and information on the changes in the activity of the heart autonomic nervous system can be obtained. The platen-type silicone rubber delivers the pulsating reflex pressure, and the platen-type silicone rubber transmits contraction through the cardiac blood. A piezoelectric type dynamic pressure sensing ceramic that senses a pulsating pulse and outputs an electrical signal of the dynamic pressure through the dynamic pressure output unit, a reference plate that is fixed at the outer periphery of the sensor accommodating unit and outputs an electrical signal of the reference pressure through the reference pressure output unit It comprises a wrist belt for applying the elastic force by fixing the sensor accommodating portion or the reference pressure plate to obtain the reflection pressure of the arteries, an amplification unit for amplifying the electrical signal attenuated in a dynamic state and a predetermined frequency band ( Mechanically transmitted from the cardiovascular system by including a filter unit for extracting only a signal of 30 to 500 Hz) Acceleration pulse wave measuring apparatus for measuring the acceleration pulse wave by changing the phosphorus pressure into an electrical signal.