KR20130033073A - Inspection system for a pulsation, an anemic, a vein elasticity and oxygensaturation using a smart phone - Google Patents

Abstract

PURPOSE: An inspection system for a pulsation, an anemic, a vein elasticity and an oxygen saturation using a smart phone is provided to check bio signals in real time. CONSTITUTION: A detecting part(10) comprises a light receiving part to detect light radiated from a light source. The detecting part detects the quantity of light transmitted when the light emitted from two LEDs having different wave lengths radiates to fingers. A wave filter(20) is connected to an output side of the detecting part to select frequency only within 0.05-5Hz with using a high pass filter and a low pass filter. An A/D converter(30) is formed in an output terminal of the wave filter to convert analog signals to digital signals. A smart phone(40) calculates bio signals with a micro controller by receiving data outputted from the A/D converter. The smart phone stores the measured data to an external memory of the smart phone and outputs the data using a display device. [Reference numerals] (10) Detecting part; (20) Wave filter; (30) A/D converter;

Description

Inspection system for a pulsation, an anemic, a vein elasticity and oxygensaturation using a smart phone}

The present invention relates to a pulse, anemia, vascular elasticity and oxygen saturation test system using a smart phone, in particular the waveform of various biometric information such as pulse, anemia, vascular elasticity and oxygen saturation measured by the measurement unit display of the smartphone Smart to enhance the visual convenience of the user by allowing the user to check directly using the device, and to increase the data processing efficiency of various biometric information by performing calculation and storage operations using the microcontroller and memory of the smartphone. Pulse, anemia, vascular elasticity and oxygen saturation test system using the phone.

In general, a pulse oximeter is used to clinically measure oxygen hemoglobin contained in the arteries. Pulse saturation measurement device measures the difference between the light absorption coefficient of oxygen hemoglobin and hemoglobin in the blood for two different wavelengths. The signal measured by the pulse oxygen saturation measuring device is called a photoplethysmographic signal (PPG).

Oxygen saturation by PPG is essential for cardiac output, pulmonary function assessment, organ specific perfusion information, cardiovascular status, and hypoxia diagnosis. In particular, the optical blood flow measurement signal (PPG) is one of vital signs of the living body, and is a primary signal for measuring the biological variables of the patient, and the optical blood flow measurement signal (PPG) is used for emergency rooms, intensive care units, etc. It is an important signal source for patient monitoring devices.

In addition, the pulse wave can be defined as the transmission of the arterial wave pressure generated by the heartbeat. The pulse wave measurement is a pressure pulse wave (P / TP = pressure, T = time) measuring method that records a time-dependent change in blood vessels, and a blood vessel volume. Volumetric pulse wave (V / T, V = volume T = time) measurement method that records the temporal change of the arterial tube, and the arterial tube expands or contracts due to internal pressure, and its pressure is transmitted to the transducer and the pressure change caused by the lateral movement of the blood vessel itself There is a recording method of side pulse wave measurement. The waveform of volumetric pulse wave is obtained by measuring the blood flow of peripheral blood vessels, and the medical system is used to identify the abnormality of blood flow and its volume. The volumetric pulse wave waveform is useful as a measure of pulse velocity and arterial health. Is being used.

The photoelectric method that is most applied in the conventional method for measuring the volumetric pulse wave is to irradiate light emitted from two LEDs of different wavelengths to a finger to detect the amount of transmission as a voltage signal and display it graphically with respect to time. . That is, in the optically applied pulse wave measuring apparatus, light emitted from a light source emitting two LEDs having different wavelengths in the measuring unit is displaced by the volume change of the small artery while passing through a finger, and the displaced light is received by the receiving unit. The received light is converted into a very minute current and output as a current.

The output current signal is converted into a voltage signal and analyzed with a signal related to the thickness of the pulse signal and the soft tissue of the finger through a separate analyzer, and the amplified signal is converted into a digital signal by the A / D converter . In the output unit, the information detected by a separate software installed on the computer is shown to the examiner in a graph, or a medical practitioner looks at the graph and analyzes the health condition.

The signal detected by the optical volumetric pulse wave measuring device having such a structure is composed of a variable component and a non-variable component. The variable component is alternating current, which is caused by the pressure generated by the heartbeat and the volume change of the arterial system. Non-variable component refers to the amount related to the light absorption of biological tissue.

Therefore, if the change in volume is normalized to non-change, the rate of change of the arterial wall can be obtained. At this time, the change in the amount of permeation is related to the change in the amount of hemoglobin in the light and blood, and the change in the amount of hemoglobin is the same as the movement of the artery wall caused by the change in the heartbeat.

However, these conventional systems for measuring the pulse, oxygen saturation, etc. display the data of the terminal itself has a problem that is not easily understood by the general public, to display it through a non-movable device such as a computer to visit a medical institution to measure it There was a hassle. In particular, in order to check the health status by viewing the pulse wave graph as well as patients with discomfort, special education is required separately, so there was a problem of visiting and visiting a medical institution and obtaining assistance from medical workers.

In addition, in the case of a portable measuring device, there is a problem in that it is easy to carry, but the display screen is so small that the user has a lot of problems in observing detected data.

The present invention provides a portable pulse, anemia, blood vessel elasticity and oxygen saturation inspection system that can be portable and without limitation of the display to solve the above problems. The microcontroller and memory of the smartphone are used to calculate and store various biometric information such as pulse rate, anemia, vascular elasticity and oxygen saturation measured by the measurement unit, and to calculate a relatively large display device of the smartphone. It provides a pulse, anemia, blood vessel elasticity and oxygen saturation inspection system using a smart phone to increase the data processing efficiency of various biometric information by outputting the calculated value to enhance the user's visual convenience. There is a purpose.

The present invention reduces the volume of the system consumed by the display device by displaying the bio-signals measured by the measurement unit using the display device of the smartphone to improve the miniaturization of the system and the visual convenience of the user. In addition, by performing the complex equations required for the calculation of the bio-signals measured by the measurement unit using the microcontroller and memory of the smart phone to increase the data processing speed and reduce the size of the measuring device. In addition, the user can use the device to check the health information by storing the measured data and the monitoring service that checks the bio signals and frequently checks them using the smart phone while daily life while the user wears the measuring device. Do.

1 is a block diagram showing the structure of the pulse, anemia, blood vessel elasticity and oxygen saturation test system using a smart phone according to the present invention.
Figure 2 is a flow chart for showing the structure of the pulse, anemia, blood vessel elasticity and oxygen saturation test system using a smart phone according to the present invention.
3 is a view showing an example of analyzing the vascular elasticity in the pulse, anemia, vascular elasticity and oxygen saturation test system using a smart phone according to the present invention.

In order to accomplish the above object,

A detector for detecting light irradiated from the light source at a position facing the pulse wave light source, the detector for detecting an amount of light transmitted by irradiating light emitted from two LEDs of different wavelengths with a finger as a voltage signal;

A filter consisting of an OP-AMP connected to the output of the detector and consisting of a high pass filter that passes only frequencies above 0.05 Hz and a low pass filter that passes only frequencies below 5 Hz so that only frequencies in the range of 0.05 to 5 Hz, the natural frequency of the pulse, are selected. ;

An A / D conversion device formed at an output end of the filter and converting an analog signal into a digital signal for transmission; And

A smartphone for receiving the data output from the A / D converter and performing a biosignal calculation using a built-in microcontroller, storing the measured data in an external memory of the smartphone, and outputting the same using a display device. It is provided.

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

1 is a block diagram showing the structure of the pulse, anemia, vascular elasticity and oxygen saturation test system using a smart phone according to the present invention, Figure 2 is a pulse, anemia, vascular elasticity using a smart phone according to the present invention And a flow chart showing the structure of the oxygen saturation test system. In addition, Figure 3 is a view showing an example of analyzing the vascular elasticity in the pulse, anemia, vascular elasticity and oxygen saturation test system using a smart phone according to the present invention.

Pulse, anemia, blood vessel elasticity and oxygen saturation inspection system using the smart phone of the present invention, as shown in Figure 1, by detecting the amount of light transmitted by irradiating the light emitted from the two LEDs of different wavelengths to the finger as a voltage signal A detection unit 10 is formed. Here, the detection unit 10 includes a light receiving unit for detecting the light emitted from the light source at a position facing the light source for pulse wave measurement, and absorbs the remaining light absorbed by the hemoglobin in the body. To measure.

The biometric information measured by the two LEDs of different wavelengths in the detector 10 is input to the filter 20 so that only the frequency in the range of 0.05 to 5 Hz, which is a natural frequency of the pulse, is selected. The filter 20 is composed of an OP-AMP including a high pass filter for passing only a frequency of 0.05 Hz or more and a low pass filter for passing a frequency of 5 Hz or less at the output side of the detector 10.

The output signal of the filter 20 is input to the smart phone 40 through the A / D conversion device 30 for converting the analog signal to a digital signal. Vegetation information such as pulse rate and hemoglobin value detected by the detection unit 10 is input to the smartphone 40 through the filter 20 and the A / D converter 30. The smart phone 40 improves the data processing speed by performing complex equations required for the calculation of the measured biosignal using a microcontroller and a memory.

In addition, a user can use the smart phone 40 to perform a daily life while monitoring the biological signal and a monitoring service that can be checked at any time. The measured data can be utilized for later health information check by storing the measured data in the external memory of the smart phone. .

Pulse, anemia, blood vessel elasticity and oxygen saturation inspection system using a smart phone having such a structure, as shown in Figure 2, first the light receiving unit for detecting the light irradiated from the light source at a position facing the light source for pulse wave measurement When the finger is inserted into the detection unit 10 provided with the operation signal, the operation signal is sent to the pulse wave measuring light source and irradiates two LED lights having different wavelengths from the pulse wave measuring light source to the inspector's finger.

Light passing through the examiner's finger is input to the light receiving unit to measure biometric information such as pulse rate, anemia, vascular elasticity, and oxygen saturation, and convert it into digital data. (S201-S202)

The biosignal converted into digital data is wirelessly transmitted to the smart phone to calculate pulse and hemoglobin values according to the detected data. (Step S203 to step 204).

First, the pulse is measured as follows.

     (Peak factor) * 60 / Receive time = Pulse rate <Equation 1>

That is, in the method of measuring the photo blood flow measurement signal (PPG), when the light irradiated from the two LEDs having different wavelengths differs in the absorption coefficients of oxygen hemoglobin and hemoglobin at the time of heartbeat, the received data can be received. The waveform is output linearly by taking dots in order through the graphic of the smartphone, and the pulse rate is determined by the number of peaks for 1 minute of the output waveform.

In addition, since the absorption characteristics in the red wavelength (660 nm) and the near infrared wavelength (890 nm) region of the light irradiated by the examiner's finger on two different wavelength LEDs are different, the haemoglobin is oxidized using the two wavelengths. The amount of can be calculated as shown in <Equation 2> and the amount of non-oxidized hemoglobin can be calculated as shown in <Equation 3> to allow the measurement of oxygen saturation in blood. Oxygen saturation is calculated as shown in <Equation 4>.

<식2>

<Equation 2>

<식3>

<Equation 3>

<식4>

<Equation 4>

The degree of oxygen saturation (SpO 2) is expressed as the percentage of oxygen hemoglobin to the sum of hemoglobin in the blood and oxygen hemoglobin, and in healthy people this value is close to 100. Conventionally, the value of SpO2 in a practical clinical environment is calculated using a weighted moving average (WMA) technique. This method is capable of signal processing in the time domain and exhibits an error in the range of 2% (1 standard deviation).

When the pulse rate and oxygen saturation are calculated as described above, the smartphone calculates anemia index and vascular elasticity using the calculated pulse rate and oxygen saturation level (step 205). By adding the amount of HbO2 and measuring the total amount of hemoglobin, the anemia index is calculated as in the following <Equation 5>.

<식5>

<Equation 5>

In addition, the blood vessel elasticity is calculated by the use of the blood flow per volume of the blood vessels through the second derivative of the pulse wave measured as shown in Figure 3, by analyzing the waveform of the peak and inflection point of the calculated use pulse wave to improve the blood vessel elasticity Will be analyzed.

Pulse, anemia, vascular elasticity and oxygen saturation test system using a smart phone according to the present invention can easily grasp the pulse, anemia, vascular elasticity and oxygen saturation regardless of the place through a smart phone that the user can easily contact It can have the effect of solving the trouble of the existing test, and can also be usefully used for the determination of the effects of commercially available cardiac medicine and other drugs, hypertension, stroke (cerebral hemorrhage, cerebral infarction, cerebral thrombosis), arteriosclerosis and As a result, symptoms such as diabetes can be checked from time to time, which can greatly contribute to the health promotion of patients with these diseases and normal people.

Claims (4)

A light receiving unit for detecting light irradiated from the light source at a position facing the light source for pulse wave measurement, and a detection unit 10 for detecting the amount of light transmitted by irradiating light emitted from two LEDs of different wavelengths with a finger as a voltage signal 10 );
OP-AMP, which is connected to the output side of the detection unit 10 and consists of a high pass filter for passing only frequencies of 0.05 Hz and above and a low pass filter for passing frequencies below 5 Hz so as to select only frequencies in the range of 0.05 to 5 Hz, which are the natural frequencies of the pulses. Filter consisting of 20;
An A / D conversion device 30 formed at an output end of the filter 20 for converting an analog signal into a digital signal and transmitting the digital signal; And
Receives data output from the A / D converter 30 and performs a biosignal calculation using a built-in microcontroller, stores the measured data in an external memory of a smartphone, and outputs the same using a display device. Pulse, anemia, blood vessel elasticity and oxygen saturation test system using a smart phone having a smart phone 40 to. According to claim 1, wherein the smart phone 40, pulse, anemia, blood vessel elasticity and oxygen saturation test system using a smart phone, characterized in that to calculate the pulse as shown in <Equation 1>.
(Peak Factor) * 60 / Receive Time = Pulse Rate <Equation 1> According to claim 1, wherein the smart phone 40 is a pulse, anemia, blood vessel elasticity and oxygen saturation test system using a smart phone, characterized in that to calculate the oxygen saturation as shown in <Equation 2> to <Equation 4> .

<Equation 2>

<Equation 3>

<Equation 4> The system of claim 1, wherein the smartphone 40 calculates an oxygen saturation degree as shown in Equation 5 below.

<Equation 5>

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