KR20060116635A - Method and apparatus for pulsation detection - Google Patents

Abstract

An apparatus and a method for detecting a pulsation are provided to monitor intensity or a form of pulsation according to intensity of a pressure by measuring the intensity of the pressure which a silicon rubber layer receives from a skin. An optical sensor is composed of an infrared light-emitting element(2) and a light-receiving element(3) which is fixed on a PCB(1). A silicon rubber layer(5) penetrates a hole on the PCB(1) and penetrates infrared rays between the element of the optical sensor and a skin contact surface. The silicon rubber layer(5) transfers a pressure to a pressure sensor(4). A pressure sensor(4) is fixed on the PCB(1) to measure the intensity of the pressure which the silicon rubber layer(5) receives from the skin surface.

Description

Pulse wave detection device and detection method {Method and Apparatus for Pulsation Detection}

1 is a perspective view of a pulse wave detection device detected by a conventional pressure sensor.

2 is a cross-sectional view of a conventional portable photoelectric pulse wave detection device.

3 is a plan view of the pulse wave detection apparatus according to the present invention.

4 is a side view of the pulse wave detection apparatus according to the present invention.

5 is a state diagram used in the pulse wave detection system apparatus according to the present invention.

6 is a block diagram of a pulse wave detection system according to the present invention.

Figure 7 is a graph of the detection of the pulse wave according to the pressure difference measured by the pulse wave detection method according to the present invention.

* Explanation of symbols for main parts of drawings *

1: PCB circuit board 2: infrared light emitting device

3: light receiving element 4: pressure sensor

5: Silicone rubber layer 6: Cable connector

7: Velcro band 8: protective goggles

The present invention relates to a pulse wave detection device and a detection method, and more particularly, a light-only sensor unit comprising an infrared light emitting device (IR LED) and a light receiving device (Photo Tr.) As a means for measuring the temporal change of blood vessel volume. And a silicone rubber layer for protecting the photoelectric sensor unit and a pressure sensor unit for monitoring the strength of pressure received from the skin when the silicone rubber layer comes in contact with the skin. The sensors are miniaturized and portable as integrated sensors through circuit integration. It relates to a pulse wave detection device and a detection method characterized in that.

In general, a method for detecting pulse waves from the human body can be classified into a largely invasive method and a noninvasive method. First, the invasive method is a method of detecting a pulse wave by directly inserting a pressure transducer using a strain gage into a blood vessel of a subject, so that the subject causes pain and is not used much. On the other hand, non-invasive pulse wave detection method is widely used because it does not cause pain to the subject and can detect the pulse wave by a simple method.

Non-invasive pulse wave detection methods are currently widely used, such as optical detection, ultrasonic detection, microwave detection, etc., double ultrasonic detection and microwave detection can be measured in large arteries However, there is a disadvantage that one cannot detect characteristic changes in the vascular system at the peripheral portion.

Among the above-mentioned pulse wave detection methods, an optical pulse wave detection technique that is configured to emit light and a light receiver using an optical element, and then detects light emitted by the light receiver after scanning a light source to a human body is most commonly used. Light emitting diodes (LEDs) are used, and photodiodes or phototransistors (PTr) are used as the light detection elements. In clinical practice, researches to measure photoplethysmography (PPG) using photoelectric sensors using infrared light emitting sources have been actively conducted. The pulse wave measuring area using the photoelectric pulse wave sensor is measured at the peripheral part of the tissue such as earlobe, finger, and toe with high blood vessel density, and the measured signal varies in intensity or shape depending on the body part. Therefore, the changing aspect is also shown.

As a conventional pulse wave detection device, the pulse wave detection device registered in Korean Patent Laid-Open Publication No. 0182818 has three pressure sensors 31, 32, and 33 for detecting arterial pulse wave as shown in FIG. Both ends of the fixing plate 34 with the fixing plate 34 to which the sensors 31, 32 and 33 are mounted, and the surface on which the pressure sensors 31, 32 and 33 are mounted. And a pouch (35) connected to the air bag (36) disposed at a position opposite to the pressure sensors (31), (32), (33) of the bag (35). The present invention relates to a pulse wave detection device, but the pulse wave detection device has a function of measuring pressure pulse wave at three positions of the radial artery on the wrist. The device can record pressure pulse waves in the radial artery of the wrist, but not volume pulse waves, which is a different technique from the present invention.

And As a conventional photoelectric pulse wave measuring device, a portable photoelectric pulse wave measuring device registered in Korean Utility Model Publication No. 20-0283686 is a device signal part 41 and the LCD monitor (L) inside the body as shown in FIG. The separation membrane (T) is formed so as to be isolated from the upper plate (45) on which the specific wavelength filter (48) and the temperature sensor (49) are installed, and the upper plate (having the pulse wave light source 47). The detection unit 43 is formed to face the upper and lower sides 46, and the specific wavelength filter 48 is absorbed by 940 nanometer light emitted from the pulse wave measuring light source 47, so that hemoglobin in the body is absorbed. Absorbs the remaining light, and the signal processor 44 connected to the upper and lower plates 45 and 46 of the detector 43 with the separator T therebetween is formed as an I / V converter. However, the pulse wave detection device as described above is the shape of the volumetric pulse wave There was a problem in medical diagnosis using.

Therefore, in order to solve the above problems, the present invention surrounds the photoelectric sensor when detecting pulse waves using a photoelectric sensor including an infrared light emitting device (IR LED) and a light receiving device (Photo Tr.). By measuring the strength of the pressure applied to the skin by the silicone rubber layer by monitoring the intensity and shape of the waveform, the detection result of the pulse wave changed according to the intensity of the pressure can be known. It is an object of the present invention to provide a pulse wave detection device and a detection method characterized by miniaturization and portableness as an integrated sensor through integration.

According to the present invention, the detection pulse wave is determined in consideration of the degree of change in the intensity or shape of the waveform of the pulse wave detected according to the strength of pressure applied to the skin by the silicone rubber layer surrounding the photoelectric sensor unit and the change in the measurement time. The feature is that it can be done.

As a means for solving the above problems, the present invention provides a photoelectric sensor unit which is a means for measuring the temporal change of blood vessel volume, a silicone rubber layer surrounding the photoelectric sensor unit, and the strength of the pressure applied to the skin by the silicone rubber layer. It is composed of a pressure sensor to measure, it is possible to determine the detected pulse wave by monitoring the intensity of the waveform or the degree of shape that changes depending on the strength of the pressure in contact with the skin, and the sensors are integrated sensors through the circuit integration The present invention relates to a pulse wave detection device and a detection method characterized by miniaturization and portability.

The photoelectric sensor unit detects skin blood flow and pulse wave with a small pulse wave sensor of a reflection type using an infrared light emitting element (IR LED) and a light receiving element (Photo Tr.), And the pressure sensor unit uses a skin strain pressure using a semiconductor strain gauge. As a sensor, the pressure applied to the skin by the silicone rubber layer surrounding the photoelectric sensor is measured using a medium capable of pressure transfer between the sensor and the skin contact surface.

Referring to the configuration of the pulse wave detection apparatus according to the present invention in detail with reference to the accompanying drawings as follows.

3 and 4 are a plan view and a side view of the pulse wave detection apparatus according to the present invention detects the photo-only pulse wave at the body part and at the same time the pressure received from the skin when the silicone rubber layer surrounding the photo-only sensor portion in contact with the skin Pulse wave detection device having a pressure sensor for measuring the intensity of the.

The present invention relates to a photoelectric pulse wave detection device using a photoelectric sensor composed of an infrared light emitting element (2) and a light receiving element (3) fixed to a PCB circuit board (1),

A silicon rubber layer (5) for perforating the PCB circuit board (1) to transmit infrared rays between the elements of the photoelectric sensors and the skin contact surface and to transmit pressure to the pressure sensor (4);

A pressure sensor (4) fixed to the PCB circuit board (1) to measure the strength of the pressure the silicone rubber layer (5) receives from the skin;

It consists of.

The pressure sensor 4 uses a semiconductor strain gauge and takes a direction parallel to the skin adhesion surface, and when the silicon rubber layer 5 surrounding the photoelectric sensor and the pressure sensor contacts the skin surface, the silicon rubber layer is removed from the skin. It serves to measure the strength of the pressure applied to (5). The photoelectric sensor is configured such that the infrared light emitting element 2 and the light receiving element 3 are located on both sides of the pressure sensor 4 in a reflective manner, and the sensors are fixed using a PCB substrate.

In order to protect the sensors, the upper portion of the PCB substrate was covered with the protective glasses 8. The material of the protective glasses 8 is a synthetic resin material of a transparent material, but the type thereof is not particularly limited, but polyethylene or polypropylene is preferably used.

5 is a diagram illustrating a state of use of the pulse wave detection apparatus according to the present invention, wherein a main body of a PCB substrate covered with a protective mirror 8 is connected to a lead wire and a skin using a cable connector 6 and a velcro band 7. It was configured for easy attachment.

The pulse wave detection apparatus according to the present invention as described above detects the pulse wave by the method as shown in FIG.

The photoelectric sensor unit 10 including an infrared light emitting device (IR LED) and a light receiving device (Photo Tr.) Transmits the information received from the human body to the pulse wave converting means 30, converts the pulse wave into a signal, and then converts the converted pulse wave into a signal. The signal processing means 40 which is transmitted to the processing means 40 and receives the converted pulse wave is a pressure sensor part that receives the strength of the pressure received from the skin when the silicon rubber layer surrounding the photoelectric sensor part 10 contacts the skin. The pulse wave is detected by the method received from the 20 and processing the signal according to the change of the pressure and transmitting the signal to the display means 50 to display the result in the display means 50. Of course, the pulse wave converting means 30, the signal processing means 40 and the display means 50 in the present embodiment may be generally applied to a computer equipped with a display.

As an embodiment according to the present invention, the pulse wave detection method using the photo-only sensor detects the photo-specific pulse wave in the radial artery using the photo-sensitive sensor among the skin-attached sensors, wherein the silicon rubber layer of the pulse-wave detection device receives the pressure from the skin. The pulse wave detected according to the intensity is as follows.

(Example)

The change in blood volume was measured by irradiating a near-infrared LED light source with a wavelength of 930 nm, in which the pressure received from the skin by the silicone rubber layer surrounding the photoelectric sensor was 80 mmHg (FIG. 7A), 100 mmHg (FIG. 7B), and 140 mmHg (FIG. 7C) shows pulse wave detection graphs respectively.

The photoelectric sensor is not in direct contact with the skin, but the pulse wave detection graph is different as shown in FIG. 7 according to the strength of the pressure of the silicone rubber layer surrounding the photoelectric sensor from the skin, and the volume pulse wave increases as the pressure received from the skin increases. The amplitude of and then decreases again, and the shape of the volumetric pulse wave changes according to the pressurized state.

Therefore, the present invention constituted as described above, when detecting the pulse wave using the photo-only sensor unit, the pressure of the silicon rubber layer surrounding the photo-only sensor unit to measure the strength of the pressure applied to the skin by the pressure sensor unit to monitor the strength of the pressure As a result of detecting the changed pulse wave, it is possible to measure the intensity of the pressure received from the skin by the silicone rubber layer surrounding the photoelectric sensor and monitor the intensity or shape of the waveform according to the intensity of the pressure. At the same time, the sensors can be miniaturized and portable as integrated sensors through circuit integration.

Claims (4)

In the photoelectric pulse wave detection device using the photoelectric sensor consisting of the infrared light emitting element (2) and the light receiving element (3) fixed to the PCB circuit board (1), A silicon rubber layer (5) for perforating the PCB circuit board (1) to transmit infrared rays between the elements of the photoelectric sensors and the skin contact surface and to transmit pressure to the pressure sensor (4); A pressure sensor (4) fixed to the PCB circuit board (1) to measure the strength of the pressure the silicone rubber layer (5) receives from the skin; Pulse wave detection device, characterized in that consisting of. The pulse wave detection device according to claim 1, wherein the pressure sensor (4) uses a semiconductor strain gauge and is in a direction parallel to the skin adhesion surface. 2. The pulse wave detection device according to claim 1, wherein the infrared light emitting element (2) and the light receiving element (3) are reflection type so as to be located at both sides of the pressure sensor (4). The photoelectric sensor unit 10 including an infrared light emitting device (IR LED) and a light receiving device (Photo Tr.) Transmits the information received from the human body to the pulse wave converting means 30, converts the pulse wave into a signal, and then converts the converted pulse wave into a signal. The signal processing means 40 which is transmitted to the processing means 40 and receives the converted pulse wave is a pressure sensor part that receives the strength of the pressure received from the skin when the silicon rubber layer surrounding the photoelectric sensor part 10 contacts the skin. 20. A pulse wave detection method characterized in that a signal received from (20) is processed, the signal according to the change of pressure is processed, transmitted to the display means (50) and the result is displayed on the display means (50).

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