KR101049020B1 - Medical Sensing System and Medical Sensing Method - Google Patents

Abstract

The present invention relates to a medical sensing system and method, and more particularly, medical sensing to enable pulse, oxygen saturation, vascular elasticity measurement, and autonomic diagnosis using a red light and an infrared sensor anytime, anywhere. System and method.

The medical sensing system of the present invention includes a sensor unit and a terminal, and the sensor unit detects and transmits two light emitting diodes (LEDs) for outputting and irradiating red light and infrared light, and the red and infrared light transmitted or reflected. An optical sensor including a light receiver configured to convert the signal into a signal; An A / D converter for converting the converted electrical signals into digital signals; A microprocessor for storing signals converted into digital signals by the A / D converter; And a transmitter for transmitting signals stored in the microprocessor to the terminal, the terminal comprising: a data receiver for receiving signals transmitted by the transmitter; And a terminal including a control unit for calculating a pulse, oxygen saturation, and vascular elasticity by calculating and processing the received signals, and performing autonomic neural diagnostics.

Medical Sensor, Blood Flow Waveform, Pulse, Oxygen Saturation, Terminal

Description

Medical Sensing System and Method

The present invention relates to a medical sensing system and method, and more particularly, medical sensing to enable pulse, oxygen saturation, vascular elasticity measurement, and autonomic diagnosis using a red light and an infrared sensor anytime, anywhere. System and method.

A person's state of health can be indirectly determined from the person's pulse, oxygen saturation, and vascular elasticity, and these values can be obtained by computing a human's blood flow waveform.

When a part of the human body is irradiated with red light and infrared light using a light emitting diode, light transmitted or reflected is present. When the light is detected using a photo diode and converted into an electrical signal, a blood flow waveform can be obtained. The pulse rate can be calculated by calculating the interval between peaks from the blood flow waveform. The change rate of the pulse is calculated by dividing the amount of change in the pulse measured at each cycle of the waveform by the average pulse. From this, the degree of stress can be determined to diagnose the autonomic nerve. In addition, the degree of vascular elasticity can be grasped from the waveform of the acceleration pulse wave obtained by differentiating the blood flow waveform twice. On the other hand, the blood flow waveform for red light has a characteristic that varies in size depending on the oxygen saturation, whereas the blood flow waveform for infrared light does not change in size according to oxygen saturation, using this characteristic blood flow waveform for red light and infrared light The oxygen saturation can be calculated by comparing

Typically, such a measuring device for pulse, oxygen saturation, vascular elasticity, etc. has a problem that the circuit configuration is very complicated, bulky or expensive, not easy to use for professional use, and difficult to diagnose. Also, even if you feel abnormal in your health, you can't know the condition until you go to the hospital or use professional equipment.You can also keep track of your health and personally manage the change. There is a problem that is difficult.

On the other hand, in recent years, as the interest in health increases, the desire to check their health state anytime, anywhere has increased the demand for the user to easily measure the health state using the device possessed by the individual.

Therefore, there is a need for a system that enables a user to grasp the state of health by measuring his pulse, oxygen saturation, vascular elasticity, etc. anytime, anywhere, even if there is no diagnosis or expert diagnosis or a bulky and expensive device.

The technical problem to be achieved by the present invention is to detect the blood flow waveform of the user using an optical sensor included in a small medical sensor and transmit it to the terminal by wire or wireless to measure the pulse, oxygen saturation, vascular elasticity, etc. The present invention provides a medical sensing system and a medical sensing method that can identify one's health status anytime and anywhere without any space limitation.

According to an embodiment of the present invention for achieving the above object, a medical sensing system comprising a sensor unit and a terminal, the sensor unit two light emitting diodes (LED) for emitting red light and infrared light to irradiate, and An optical sensor including a light receiving unit configured to detect the red light and the infrared light reflected or reflected into an electric signal; An A / D converter for converting the converted electrical signals into digital signals; A microprocessor for storing signals converted into digital signals by the A / D converter; And a transmitter for transmitting signals stored in the microprocessor to the terminal, the terminal comprising: a data receiver for receiving signals transmitted by the transmitter; And calculating and processing the received signals to calculate pulse, oxygen saturation, and vascular elasticity, and to perform autonomic diagnosis.

The control unit includes: a waveform comparison unit comparing the received signals with each other and calculating a difference; A derivative operator for differentiating the signal with respect to time; A peak interval detector for calculating inter-peak time intervals of the signal based on an output of the derivative operator; An average pulse calculator configured to calculate an average value of the time intervals between the peaks based on an output of the peak interval detector; And a pulse change rate measuring unit configured to calculate a rate of change of the time interval between peaks by dividing the interval between peaks calculated by the peak interval detector by an output value of the average pulse calculator.

The terminal further includes a display unit for displaying a result of the calculation processing by the controller.

The transmitter consists of a universal asynchronous transceiver (UART), USB port (USB Port), or a wireless communication module.

The terminal consists of a mobile terminal or a computer.

The sensor unit further includes a switching circuit for alternately lighting two light emitting diodes included in the optical sensor.

On the other hand, according to another embodiment of the present invention for achieving the above object, the medical sensor capable of data communication with the terminal includes two light emitting diodes (LED) for outputting and irradiating red light and infrared light; A light receiving unit which detects the transmitted red light and infrared light and converts the light into an electrical signal; An A / D converter for converting output signals of the light receiver into a digital signal; A microprocessor for storing output signals of the A / D converter; And a transmitter for transmitting signals stored in the microprocessor to the terminal.

The transmitter consists of a universal asynchronous transceiver (UART), USB port (USB Port), or a wireless communication module.

A switching circuit for lighting the two light emitting diodes alternately is further included.

On the other hand, the medical sensing method of another embodiment of the present invention for achieving the above object is a light detection step of irradiating a part of the human body with red light and infrared light, detecting the transmitted red light and infrared light and converting it into an electrical signal ; An A / D conversion step of converting output signals of the light detection step into a digital signal; A transmission step of temporarily storing the output signals of the A / D conversion step and then transmitting them through wireless or wired communication; And calculating the pulse, oxygen saturation, and vascular elasticity by receiving the received signals and calculating the calculated signals, and performing autonomic diagnosis.

The calculating step includes: a waveform comparison step of comparing the transmitted signals with each other and calculating a difference; Differentiating the signal over time; A peak interval detection step of calculating inter-peak time intervals of the signal based on the output of the derivative step; An average pulse calculation step of calculating an average value of the time intervals between the peaks based on the output of the peak interval detection step; And a pulse change rate measuring step of calculating a rate of change of the time interval between peaks by dividing the time interval between peaks calculated in the peak interval detecting step by the output value of the average pulse calculating step.

It further includes a display step of displaying the result of the calculation processing of the calculation step.

As described above, according to the present invention, blood flow waveforms are detected using a small medical sensor including an optical sensor, and the pulse, oxygen saturation, and blood vessels are transmitted by wire or wirelessly to a terminal having a built-in measurement diagnostic program. By measuring elasticity, you can know your health status anytime, anywhere without any constraints on time and space.

In addition, simply by connecting a small medical sensor including an optical sensor to the terminal can directly determine their own pulse, oxygen saturation, etc., even if you carry only a small medical sensor, wherever the terminal is located I can figure out.

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

1A-1C illustrate various embodiments of a medical sensing system in accordance with the present invention.

1A illustrates a medical sensing system 1000 in accordance with one embodiment of the present invention. The medical sensing system 1000 may include a sensor 1100 including a plug 1110 and an optical sensor 1120, and a mobile terminal 1200.

The plug 1110 of the sensor unit 1100 may be 24PIN and connected to the 24PIN communication connector of the mobile terminal 1200. The optical sensor 1120 may include a light emitting sensor and a light receiving sensor to detect blood flow waveforms for a part of the human body, and the detected signal is processed through a circuit embedded in the plug 1110, and then the plug 1110 is removed. It is transmitted to the mobile terminal 1200 through. The mobile terminal 1200 measures a pulse, an oxygen saturation level, autonomic nerve diagnosis, and vascular stabilization on the basis of the received signal, and a program necessary for the measurement may be mounted inside the mobile terminal 1200.

1B illustrates a medical sensing system 2000 in accordance with another embodiment of the present invention. The medical sensing system 2000 may include a sensor unit 2100 and a computer 2200 connected thereto. In this case, the plug 2110 of the sensor unit 2100 may be a USB plug, which is connected to the USB port of the computer 2200. The blood flow waveform signal detected by the sensor unit 2100 is transmitted to the computer 2200 through the plug 2110, and the computer 2200 has a program for measuring pulse, oxygen saturation, etc. based on the detected signal. It can be built in.

1C illustrates a medical sensing system 3000 in accordance with another embodiment of the present invention. The medical sensing system 3000 may include a sensor unit 3100 and a computer 3200, and the communication between the sensor unit 3100 and the computer 3200 may be performed wirelessly. The sensor unit 3100 includes an optical sensor and a predetermined circuit, and the configuration of the circuit is the same as the circuit embedded in the plugs 1110 and 2110 of FIGS. 1A and 1B. In addition, the sensor unit 3100 further includes a wireless communication circuit for wireless communication with the computer 3200 having a wireless communication port, and the signal for the blood flow waveform detected by the optical sensor wirelessly through the computer 3200. Is sent to. On the other hand, the sensor unit 3100 is operated using a battery, and in this case, the computer 3200 may also have a program for measuring pulse, oxygen saturation, etc. based on a signal transmitted from the sensor unit 3100. .

2 is a block diagram of a circuit included in the sensor unit 1100, 2100, 3100 in the medical sensing system according to the present invention.

As shown in FIG. 2, the sensor units 1100, 2100, and 3100 include an optical sensor 5100, a current-voltage conversion amplifier 5110, a sample hold circuit 5120, an adder amplifier 5130, and an A / D. Converter 5140, D / A converter 5150, voltage-current converter 5160, switching circuit 5170, microprocessor 5200, communication unit 5300.

Circuits other than the optical sensor 5100 and the communication unit 5300 may be included in the plugs 1110 and 2110 or the sensor unit 3100 of the sensor units 1100 and 2100, and in the case of the sensor unit 3100, the configurations listed above. All of the elements may be included in the sensor unit 3100.

The light sensor 5100 includes a light emitting unit for outputting and irradiating predetermined light, and a light receiving unit for detecting and converting light transmitted and reflected from the light emitting unit into an electric signal. The light emitting unit may be composed of two light emitting diodes (LEDs) for outputting and irradiating two lights having different wavelengths, and the two light emitting diodes may have a red wavelength (680 nm) and a near infrared wavelength (890 nm), respectively. It can output light. A body part such as a finger may be placed between the light emitting part and the light receiving part, and the light receiving part senses a blood flow signal by detecting light emitted from the light emitting part and passing or reflecting the body part. The light receiving unit may be a photodiode, and converts the detected light into an electrical signal.

 The two light emitting diodes (LEDs) alternately operate, so that two lights having different wavelengths are alternately irradiated. Operation of the light emitting diode (LED) will be described later in detail.

The current-voltage conversion amplifier 5110 converts the amount of light converted into the amount of current by the light detecting means of the optical sensor 5100 into the amount of voltage. Since the two light emitting diodes operate alternately, the signal converted into voltage is largely three, that is, a signal for light having a red wavelength (680 nm), a signal for light having an infrared wavelength (890 nm), and a light emitting diode ( It is divided into the signal when the LED is not turned on at all.

The sample hold circuit 5120 stores a signal when the light emitting diode is not turned on at all among these three signals. The signal when the light emitting diode is not turned on is a signal by external light, which is used to remove a signal for external light from the signal by each light emitting diode having two wavelengths.

The adder 5130 receives the output signal from the current-voltage converter amplifier 5110 and the signal from the sample-hold circuit 5120, and adds or subtracts the light having a red wavelength (680 nm) and infrared light from which the influence of external light is removed. It outputs a signal for light of wavelength (890 nm). That is, the output signal of the current-voltage conversion amplifier 5110 becomes a signal for the light of the red wavelength and the light of the infrared wavelength including the external light, where the signal by the external light stored in the sample hold circuit 5120 By adding or subtracting, it is possible to output a signal for light having a pure red wavelength and an infrared wavelength from which the influence of external light is removed.

The A / D converter 5140 receives a signal for the light having the red wavelength (680 nm) and the infrared wavelength (890 nm) from which the influence of external light is removed from the adder amplifier 5130, converts it into a digital signal, and then microprocessor Provided at 5200.

The microprocessor 5200 receives a digital signal for light having a red wavelength (680 nm) and an infrared wavelength (890 nm), that is, a digital blood flow measurement signal, from the A / D converter 5140. In addition, the microprocessor 5200 allows the light emitting diode of the optical sensor 5100 to supply an optical signal in the form of a pulse. That is, the amount of light emitted to be emitted by the light emitting diode of the optical sensor 5100 is calculated based on a signal received from the A / D converter 5140, and the pulse width modulation (PWM) is used to calculate the amount of light emitted. Output as a signal. By this signal, the light emitting diode of the optical sensor 5100 can output an optical signal in the form of a pulse.

The D / A converter 5150 converts the pulse width modulated (PWM) digital signal into an analog signal. After conversion to an analog signal, a low pass filter (LPF) may be used to reduce noise.

The voltage-current converter 5160 converts the voltage signal converted into analog by the D / A converter 5150 into a current signal and outputs it to the switching circuit 5170.

The switching circuit 5170 alternately turns on two light emitting diodes provided in the optical sensor 5100 to irradiate light with a required amount of light emitted by the microprocessor 5200.

The sample hold circuit 5120 and the switching circuit 5170 must be operated over time. That is, since the sample hold circuit 5120 needs to store a signal for external light, when the light emitting diodes of the optical sensor 5100 alternately irradiate light, only the signal when both light emitting diodes are turned off should be stored. In addition, the switching circuit 5170 should switch the two light emitting diodes at regular cycles so that they can be alternately turned on. Therefore, when both of the light emitting diodes are turned off by the switching circuit 5170, the sample hold circuit 5120 must store the signal at this time, so that the sample hold circuit 5120 and the switching circuit 5170 are synchronized with each other. It needs to work. To this end, a time counter (TC) is used, which may be mounted in the microprocessor 5200, which may hold an event signal every time a predetermined time (for example, 1 ms or 10 ms) passes. And send it to the 5120 and the switching circuit 5170 to control the operation. This operation will be described later in detail.

The communication unit 5300 may include one of a universal asynchronous receiver / transmitter (UART) 5310, a USB port 5320, or a wireless communication module 5330. In the embodiment shown in FIG. 1A, a UART 5310 is provided at a plug 1110 of the sensor unit 1100 to transmit data with the mobile terminal 1200. In the embodiment shown in FIG. 1B, a USB port ( The 5320 may be provided at the plug 2110 to be connected to a computer to transmit data. Meanwhile, in the embodiment illustrated in FIG. 1C, the wireless communication module 5330 may be provided in the sensor unit 3100 to perform data communication with a computer having a wireless communication port. By such data communication, a digital signal for light having a red wavelength (680 nm) and an infrared wavelength (890 nm), that is, a blood flow signal, processed by the microprocessor 5200 is transmitted to a terminal such as a mobile terminal or a computer.

3 is a diagram illustrating an internal configuration of a terminal that communicates with the sensor units 1100, 2100, and 3100 by wire or wirelessly.

As shown in FIG. 3, the terminal (mobile terminal 1200, computers 2200, 3200) includes a control unit 6100, a memory unit 6200, a data storage unit 6300, a display unit 6400, and data. The receiver 6500 is included.

As described above, the sensor units 1100, 2100, and 3100 transmit a blood flow signal by wire or wirelessly, and the data receiving unit 6500 of the terminal receives the same and provides the same to the control unit 6100. The blood flow signal is a signal detected by the optical sensor 5100 of the sensor unit, and includes a waveform of the light receiver for a red wavelength (680 nm) and a light receiver for an infrared wavelength (890 nm).

The control unit 6100 includes a differential calculation unit 6110, an RR detection unit 6120, an average pulse calculator 6130, a pulse rate change calculator 6140, and a waveform comparison unit 6150. The waveform comparing unit 6150 compares the received blood flow signal, that is, the waveform obtained by the red wavelength (680 nm) and the waveform obtained by the infrared wavelength (890 nm). There is a difference in absorbance between hemoglobin (HbO ₂ ) bound to oxygen and hemoglobin (Hb) not bound to oxygen in the blood, with the largest difference in absorbance for red wavelength (680 nm). On the other hand, for the infrared wavelength (890 nm), there is no difference in absorbance between hemoglobin (HbO ₂ ) bonded to oxygen and hemoglobin (Hb) not bonded to oxygen. Therefore, by comparing the blood flow waveform with respect to the red wavelength (680 nm) and the blood flow waveform with respect to the infrared wavelength (890 nm), it is possible to determine the amount of hemoglobin (HbO ₂ ) combined with oxygen, and thus the degree of oxygen saturation. It can be measured.

The derivative calculator 6110 differentiates the blood flow waveform by the infrared wavelength (890 nm) with no change in the waveform size according to the oxygen saturation level with respect to time. This first derivative is called velocity pulse wave, which allows us to analyze changes that are difficult to distinguish from the original waveform. In addition, acceleration pulse wave is another derivative (second derivative) of velocity pulse wave, which makes it possible to more clearly grasp the inflection point of the original waveform, thereby identifying vascular elasticity.

The peak interval detecting unit 6120 finds the inflection point of the waveform based on the result of the second derivative of the blood flow waveform by the infrared wavelength (890 nm), and measures the time positions having the peak value through the peak difference detection unit 6120. A time interval in which neighboring peak values exist corresponds to one period, and using the obtained periodic value, the pulse can be measured through Equation 1.

(PR : 맥박)

(PR: pulse)

The average pulse measuring unit 6130 calculates an average pulse for a predetermined time on the basis of the pulse rate per cycle measured in real time by the peak interval detecting unit 6120, and transmits the result to the pulse rate change measuring unit 6140. to provide.

The pulse change rate measuring unit 6140 calculates the change amount of the pulse measured by the peak interval detecting unit 6120 for each cycle. The result is divided by the average pulse measured by the average pulse measuring unit 6130 to obtain the rate of change of the pulse. Autonomic nerves or stress can be diagnosed from the rate of change of the pulse. If the rate of change is high, the stressed state is high and if it is low, it can be judged as normal.

The memory unit 6200 may store an algorithm or a program necessary for performing a calculation used in the control unit 6100 to measure pulse, oxygen saturation, vascular elasticity, and diagnose autonomic nerves. The algorithm or program may be embedded in the terminal, but may be mounted in other ways.

The data storage unit 6300 may temporarily store numerical values such as pulse rate, oxygen saturation level, and vascular elasticity measured by the controller 6100.

The display unit 6400 may be a user screen of the mobile terminal 1200 or a monitor of the computers 2200 and 3200, and the pulse and oxygen saturation diagram calculated by the controller 6100 together with the blood flow waveform received by the data receiver 6500. , Vascular elasticity and the like can be displayed.

4 is a flowchart illustrating the operation of the optical sensor 5100 of the sensor unit.

The two light emitting diodes provided in the optical sensor 5100 are alternately turned on or off by the switching circuit 5170, and the switching of the switching circuit 5170 is an event signal transmitted from a time counter embedded in the microprocessor 5200. Controlled by

Referring to FIG. 4, the time counter transmits an event signal to the switching circuit 5170 every predetermined time (here, 1 ms). The switching circuit 5170 checks a value of a predetermined variable N whenever the event signal is received (S400). The value of the initial variable N may be 0, but is not limited thereto.

If the value of the variable N is 0, the light emitting diode for irradiating light of the infrared wavelength is turned on (S411), and the photodiode as the light receiving unit detects a blood flow signal for the infrared wavelength (S412). Thereafter, the light emitting diode which irradiates light of infrared wavelength is turned off (S413), and the value of the variable N is increased by 1 (S450), and the state is returned to the initial state (S460).

If the value of the variable N is 1, both light emitting diodes irradiating light of the red wavelength and the infrared wavelength are turned off (S421), and the photodiode detects the optical signal at this time (S422). In this case, since both light emitting diodes are turned off, the optical signal detected by the photodiode is a signal by external light, and the photodetection signal at this time is converted into a voltage signal by the current-voltage conversion amplifier 5110 to sample. Hold circuit 5120.

If the value of the variable N is 2, the light emitting diode which irradiates light of a red wavelength is turned on (S431), and the photodiode detects a blood flow signal for this red wavelength (S432). Thereafter, the light emitting diode which irradiates light of the red wavelength is turned off (S433), and the value of the variable N is set to 0 again (S434), and returns to the initial stage (S460).

In this way, the time counter transmits an event signal to the switching circuit 5170 every predetermined time (1 ms), so that the switching circuit 5170 can switch on and off the two light emitting diodes, and turn on and off the two light emitting diodes. The state is switched every predetermined time (1 ms), whereby light having different wavelengths can be irradiated alternately from two light emitting diodes.

5 shows an example of an operation in which the detected blood flow waveform signal is transmitted from the sensor unit to a terminal (mobile terminal or computer).

The transfer operation can also be controlled by a time counter embedded in the microprocessor 5200. That is, a time counter provides an event signal to the transmitter 5300 every predetermined time (here 10ms), and the UART 5310, UBS port 5320, or the wireless communication module 5330 of the transmitter 5300 are event signals. Each time the signal is received, the blood flow waveform signal temporarily stored in the microprocessor 5200 is transmitted to the data receiver 6500 of the terminal (S510), and returns to the initial state (S520). As a result, the detected blood flow waveform signal may be transmitted to the terminal at regular intervals.

6A and 6B illustrate a display unit displaying pulse, oxygen saturation, and blood vessel elasticity measured by a terminal in a medical sensing system according to an exemplary embodiment of the present invention. FIG. 6A illustrates a sensor unit operating in conjunction with a computer. Fig. 6B shows a display section when the sensor section operates in conjunction with the mobile terminal.

As shown in Figure 6a and 6b, the results calculated by the control unit in the terminal, that is, the measured pulse, oxygen saturation, blood vessel elasticity, stress index (diagnosis for autonomic nerve), etc. It can be displayed as, through which the user can determine their health status in real time.

The present invention is not limited to the above described and illustrated in the drawings, and of course, more modifications and variations are possible to those skilled in the art within the scope of the following claims.

1A to 1C are examples of a medical sensing system according to the present invention.

2 is a configuration diagram illustrating a configuration of a sensor unit according to an embodiment of the present invention.

3 is a configuration diagram illustrating a configuration of a terminal according to an embodiment of the present invention.

4 is a flowchart illustrating an operation of an optical sensor included in a sensor unit.

5 is a flowchart illustrating an operation of a transmitter included in a sensor unit.

6A and 6B illustrate examples of a display unit of a terminal displaying data.

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

1000,2000,3000: Medical Sensing System 5100: Optical Sensor

5110: current-to-voltage converter amplifier 5120: sample hold circuit

5130: adder amplifier 5140: A / D converter

5150: D / A converter 5160: voltage-to-current conversion amplifier

5170: switching circuit 5200: microprocessor

5300: transmission unit 6100: control unit

6110: differential operation unit 6120: peak interval detection unit

6130: average pulse measuring unit 6140: pulse rate changing unit

6150: waveform comparator 6500: data receiver

Claims (12)

In the medical sensing system comprising a sensor unit and a terminal, The sensor unit includes: An optical sensor including two light emitting diodes (LEDs) for outputting and irradiating red and infrared light, and a light receiving unit for detecting the red and infrared light transmitted or reflected and converting the red and infrared light into an electrical signal; An A / D converter for converting the converted electrical signals into digital signals; A microprocessor for storing biosignals converted into digital signals by the A / D converter; And A transmission unit which transmits the bio signals stored in the microprocessor to the terminal, The terminal, A data receiver configured to receive the bio signals transmitted by the transmitter; And And a control unit for calculating pulse, oxygen saturation, and vascular elasticity by calculating and processing the received biosignals, and performing autonomic nerve diagnosis. The microprocessor includes a time counter having three counting modes, The sensor unit and the switching circuit for alternately lighting the two light emitting diodes according to the counting mode of the time counter, A sample hold circuit for temporarily storing an electrical signal of the optical sensor according to a counting mode of the time counter; An adder amplifier configured to correct an output electrical signal of the optical sensor through a temporary signal stored in the sample hold circuit; The switching circuit, According to the counting mode of the time counter, In the first count (0) is switched to turn on the light emitting diode for irradiating infrared light and to turn off the light emitting diode for emitting red light, In the second count (1), the light emitting diode for irradiating infrared light and the light emitting diode for irradiating red light are switched off. In the third count (2) is switched to turn off the light emitting diode for irradiating infrared light and to turn on the light emitting diode for irradiating red light (On), And the adder amplifier corrects the output electrical signal of the optical sensor from the temporary signal of the sample hold circuit stored at the second count (1). The method of claim 1, wherein the control unit, A waveform comparison unit comparing the received biosignals with each other and calculating a difference; A derivative operator for differentiating the biosignal with respect to time; A peak interval detector for calculating inter-peak time intervals of the biosignal based on an output of the differential calculator; An average pulse calculator configured to calculate an average value of the time intervals between the peaks based on an output of the peak interval detector; And a pulse change rate measuring unit configured to calculate a rate of change of the time interval between peaks by dividing the time interval between peaks calculated by the peak interval detector by an output value of the average pulse calculator. The method of claim 1, wherein the terminal, And a display unit which displays a result of the arithmetic processing by the control unit. The method of claim 1, The transmitter is a universal asynchronous transceiver (UART), USB port (USB Port), or a medical sensing system, characterized in that the wireless communication module. delete delete Two light emitting diodes (LEDs) for emitting and emitting red light and infrared light; A light receiving unit which detects the transmitted red light and infrared light and converts the light into an electrical signal; An A / D converter for converting output signals of the light receiver into a digital signal; A microprocessor for storing output signals of the A / D converter; And a transmitter configured to transmit the biosignals stored in the microprocessor to the terminal, wherein the medical sensor is capable of data communication with the terminal. The microprocessor includes a time counter having three counting modes, The medical sensor may include a switching circuit for lighting the two light emitting diodes alternately according to the counting mode of the time counter. A sample hold circuit for temporarily storing an electrical signal output from the light receiving unit according to a counting mode of the time counter; An adder amplifier configured to correct an output electrical signal of the light receiver through a temporary signal stored in the sample hold circuit; The switching circuit, According to the counting mode of the time counter, In the first count (0) is switched to turn on the light emitting diode for irradiating infrared light and to turn off the light emitting diode for emitting red light, In the second count (1), the light emitting diode for irradiating infrared light and the light emitting diode for irradiating red light are switched off. In the third count (2) is switched to turn off the light emitting diode for irradiating infrared light and to turn on the light emitting diode for irradiating red light (On), And said adder amplifier corrects the output electrical signal of said light-receiving unit from the temporary signal of said sample hold circuit stored at said second count (1). The method of claim 7, wherein The transmitter is a universal asynchronous transceiver (UART), USB port (USB Port), or a medical sensor, characterized in that the wireless communication module. delete delete delete delete

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