KR102530361B1 - System and method for measuring biometrics information - Google Patents

Abstract

A system and method for measuring biometric information are disclosed. The system for measuring biometric information according to the present embodiment may include an implant device that is inserted into the body to measure biometric information, and an external device that transmits a signal while sweeping a frequency to the implant device.

Description

Biometric information measurement system and method {SYSTEM AND METHOD FOR MEASURING BIOMETRICS INFORMATION}

Embodiments relate to a system and method for measuring biometric information.

To manage diabetes, which hundreds of millions of people have worldwide, measuring blood sugar is the most basic. Therefore, a blood glucose measuring device is an indispensable and important diagnostic device for diabetic patients.

Recently, various blood glucose measurement devices have been developed, but the most used method is a method of collecting blood by pricking a finger and directly measuring the concentration of glucose in the blood. In the case of using an invasive method, there is a method of measuring blood sugar by penetrating an invasive sensor into the skin and measuring it for a certain period of time and then recognizing it in an external reader. On the contrary, non-invasive methods include a method using a light-emitting diode (LED)-photo diode (PD), and the like. However, since the non-invasive method attaches to the skin, accuracy is reduced due to environmental factors such as sweat or temperature and foreign substances.

The information described above is for illustrative purposes only and may include material that does not form part of the prior art, and may not include what the prior art may suggest to those skilled in the art.

[Prior art document number]

Korean Registered Patent No. 10-2185556

A biological information measurement system and method capable of accurately measuring blood sugar by measuring characteristic changes according to blood sugar changes through an implant device and an external device are provided.

an implant device inserted into the body to measure biometric information; and an external device for transmitting a signal while sweeping a frequency to the implant device.

According to one side, it may be characterized in that the biometric information is measured based on the characteristic that the resonant frequency changes according to the permittivity of the surroundings of the implant device.

According to another aspect, the implant device may include an electro-magnetic (EM) based sensor that reflects a signal transmitted by the external device; and a sensor interface that measures the power level of a signal reflected from the EM-based sensor and converts it into digital data.

According to another aspect, the sensor interface may include a frequency selection filter for filtering characteristics of frequency selection according to the concentration of a surrounding target substance in the body; and an envelope detector for finding and outputting a minimum value in the frequencies output by the frequency selection filter.

According to another aspect, the envelope detector may be implemented to find a lowest point by converting a signal reflected from S11 among the S-parameters into a direct current (DC) level.

According to another aspect, the sensor interface may include an amplifier configured to adjust an output of the envelope detector to a predetermined level or higher; And it may be characterized in that it further comprises an ADC (Analog-Digital Converter) for receiving the output of the amplifier and converting it into digital data.

According to another aspect, the external device includes a wireless power transmitter for transmitting wireless power to the implant device, and the implant device includes a wireless power receiver for receiving wireless power transmitted by the external device. It can be characterized by doing.

According to another aspect, the external device may include a phase-locked loop that sweeps a frequency for driving an EM-based sensor included in the implant device; and a power amplifier providing power for driving the implant device.

According to another aspect, the external device may further include a data recovery module that recovers digital data transferred from the implant device.

According to another aspect, the external device may further include a communication module for communicating with other external devices.

According to another aspect, the external device may further include at least one EM-based sensor for measuring biometric information outside the body.

Receiving a radio frequency (RF) signal of a specific frequency transmitted by an external device; filtering a signal reflected by an electro-magnetic (EM)-based sensor included in the implant device according to a signal whose frequency is swept from the external device through a frequency selection filter; converting the filtered signal to a direct current (DC) level through an envelope detector to find a minimum value; converting the signal including the minimum value into digital data; and transmitting the digital data to the external device.

Transmitting a signal to the implant device while sweeping a frequency through a phase-locked loop to drive an electro-magnetic (EM)-based sensor included in the implant device; providing power for driving the implant device through a power amplifier; and receiving, from the implant device, digital data converted from a signal including a minimum value detected by the implant device among signals reflected by the EM-based sensor according to the frequency-swept signal. to provide.

At this time, according to embodiments of the present invention, blood sugar can be accurately measured by measuring characteristic changes according to blood sugar changes through the implant device and the external device.

1 is a diagram illustrating an example of a system for measuring biometric information according to an embodiment of the present invention.
2 is a diagram showing an example of an internal configuration of an implant device according to an embodiment of the present invention.
3 is a diagram illustrating an example of an internal configuration of an external device according to an embodiment of the present invention.
Figure 4 is a graph showing the response curve of the parameter S11 of the implant device according to an embodiment of the present invention.
5 is a graph showing a response curve of the S21 parameter of an external device according to an embodiment of the present invention.
6 is a diagram illustrating the operation of each mode of the biometric information measuring system according to an embodiment of the present invention.
7 is a diagram illustrating a propagation pattern for each mode of a blood glucose measurement sensor according to an embodiment of the present invention.
8 is a graph showing response curves of scattering parameters of an implant device and an external device in a system for measuring biometric information according to an embodiment of the present invention.
9 is a diagram illustrating an example of a method for measuring biometric information of an implant device according to an embodiment of the present invention.
10 is a diagram illustrating an example of a method for measuring biometric information of an external device according to an embodiment of the present invention.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, since various changes can be made to the embodiments, the claims of the patent application are not limited or limited by these embodiments. It should be understood that all changes, equivalents, or alternatives to the embodiments are included in the scope of the claims.

Terms used in the examples are used only for descriptive purposes and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiment belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this application, it should not be interpreted in an ideal or excessively formal meaning. don't

In addition, in the description with reference to the accompanying drawings, the same reference numerals are given to the same components regardless of reference numerals, and overlapping descriptions thereof will be omitted. In describing the embodiment, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the embodiment, the detailed description will be omitted.

In addition, in describing the components of the embodiment, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element may be directly connected or connected to the other element, but there may be another element between the elements. It should be understood that may be "connected", "coupled" or "connected".

Components included in one embodiment and components including common functions will be described using the same names in other embodiments. Unless stated to the contrary, descriptions described in one embodiment may be applied to other embodiments, and detailed descriptions will be omitted to the extent of overlap.

1 is a diagram illustrating an example of a system for measuring biometric information according to an embodiment of the present invention. The biometric information measurement system according to the present embodiment may include the implant device 100 and the external device 200 .

An implant device 100 including an EM (Electro-Magnetic) based sensor 110 manufactured for measuring biometric information in interstitial fluid is located under the skin and resonates according to the permittivity around the implant device 100 It has the characteristic of changing the frequency (resonant frequency). In order to operate the EM-based sensor 110 included in the implant device 100, a signal whose frequency is constantly changing must be injected, and when this signal is changed through the EM-based sensor 110, the interface circuit 120 for measuring it is needed In addition, the external device 200 may predict a change in biometric information of interstitial fluid (eg, a change in blood sugar concentration) through a change in coupling strength based on a fringing field. At this time, by using various multi-modes using the implant device 100 and the external device 200, the accuracy of biometric information measurement can be supplemented.

The implant device 100 may include an EM-based sensor 110 manufactured for measuring biometric information in interstitial fluid and a sensor interface 120 for measuring a signal changed through the EM-based sensor 110. And, the sensor interface 120 may include a Low-Noise Amplifier (LNA) 121, an Envelope Detector (122), and an Analog-Digital Converter (ADC) 123. This sensor interface 120 will be described in more detail with reference to FIG. 2 .

The external device 200 may transmit power to the implant device 100 through the resonator 300, and data transmission between the implant device 100 and the external device 200 may also be performed using the resonator 300. can The resonator 300 includes a first circuit included in the implant device 100 (eg, a wireless power receiver as an electric circuit composed of a coil and a condenser) and a circuit included in the external device 200 (eg, a coil and a condenser). As an electric circuit composed of, it is possible to induce a wave or vibration of a specific frequency by using a resonance phenomenon between wireless power transmission units). Although the embodiment of FIG. 1 has been described as using a frequency of 13.56 MHz, it is not limited thereto.

In this case, the implant device 100 may further include a rectifier 130, a protector 120, and a regulator 130 for management of power transmitted through the resonator 300. The rectifier 110 may be used to obtain DC power from AC power transmitted through the resonator 300, and the regulator 130 may be used to maintain a constant voltage. The protector 120 is an overvoltage protector and may be used to prevent damage to a system caused by high power in the implant device 100 when power is transmitted from the external device 200 .

As shown in FIG. 1, the external device 200 includes a power amplifier 210, an application processor (AP) 220, a data recovery module 230, an external sensor 240, A battery (Battery, 250), a crystal oscillator (X-tal Oscillator (OSC), 260), a regulator 270, and a Bluetooth module 280 may be included. The external sensor 240 includes an EM-based glucose sensor 241 for directly measuring biometric information of the external device 200 and an environmental sensor for measuring information on the surrounding environment (eg, temperature). (Environmental Sensor, 242) may be included. The EM-based blood glucose sensor 241 is an example, and one or more EM-based sensors for measuring various biometric information may be included in the external sensor 240 . The battery 250 may be used to supply power to the external device 200, and the crystal oscillator 260 may be used to generate an accurate frequency. The regulator 270 may be used to maintain a constant voltage, and the Bluetooth module 280 may be used to communicate with other external devices such as smart phones. Bluetooth is just one example, and various communication protocols for communication with other external devices and communication modules corresponding to the communication protocols may be used. The AP 220, as a Micro Control Unit (MCU), may monitor the power of the implant device 100 and the external device 200 to manage (power control) transmission of more than necessary power. In addition, data received from the Bluetooth module 280 and the external sensor 240 may be controlled, and data transmitted from the implant device 100 may be processed. Such power management or data control/processing may be performed according to an algorithm included in the AP. The data recovery module 230 may include an in-band data recovery system capable of recovering data transferred from the implant device 100 . For example, the implant device 100 may modulate the measured data into a signal of hundreds to thousands of kHz through a modulation (modulation, LSK, FSK, OSK, etc.) method, and then transmit the signal loaded with a 13.56 MHz signal. In this case, the data recovery module 230 of the external device 200 restores the signal for the data by demodulating the power after a certain amount of decrease according to the data and then returning to the normal power level and filtering the 13.56 MHz signal. can do. In addition to this, the external device 200 may include a wireless power transmission system for transmitting power for driving the implant device 100 .

2 is a diagram showing an example of an internal configuration of an implant device according to an embodiment of the present invention. The sensor interface 120 measures the S-parameter characteristics of the EM-based sensor 110, that is, the power level of Radio Frequency (RF) reflected back from the EM-based sensor 110 to It can be converted into digital data. Data converted into digital data may be transmitted outside the body (eg, the external device 200) by the implant device 100.

As described above, the sensor interface 120 may include the LNA 121, the envelope detector 122, and the ADC 123. In the embodiment of FIG. 2 , a frequency-selective filter 124 and an amplifier 125 may be further included.

The LNA 121 can receive an RF signal of a specific frequency transmitted from the external device 200, and the frequency selection filter 124 is interlocked with the EM-based sensor 110 inserted under the skin to detect a target material around the sensor ( For example, it has a frequency selection characteristic according to the concentration of blood sugar) and can process a filter operation for the magnitude of a signal reflected by the EM-based sensor 110 and returned. The envelope detector 122 may find the lowest point by converting the signal reflected at S11 among the S-parameters into a DC (Direct Current) level. The amplifier 125 may adjust the output of the envelope detector 122 to match the ADC 123, and the ADC 123 digitizes the amplified signal and transmits it to a Simultaneous Wireless Information and Power Transfer (SWIPT) IC (Integrated Circuit). can Such a SWIPT IC may be a circuit including the first circuit included in the implant device 100 among the above-described rectifier 130, protector 120, regulator 130, and resonator 300. The ADC 123 may be implemented to sufficiently handle, for example, a signal range of 30 dB or more.

3 is a diagram illustrating an example of an internal configuration of an external device according to an embodiment of the present invention. The external reader module 400 may be included in the external device 200 and may include a power amplifier 210 and a phase-locked loop 410 . This external readout module 400 is frequency sweeping that drives the EM-based sensor 110 over a sufficiently wide frequency band to measure changes in the S-parameter characteristics of the EM-based sensor 110 included in the implant device 100 and a driving (frequency sweeping and driving) circuit. Through this, the phase-locked loop 410 constituting the external reading module 400 can process the frequency scan of the implant device 100 inserted under the skin, and the power amplifier 210 drives the implant device 100. power can be provided.

4 is a graph showing a response curve of the S11 parameter of an implant device according to an embodiment of the present invention, and FIG. 5 is a graph showing a response curve of the S21 parameter of an external device according to an embodiment of the present invention. .

6 is a diagram illustrating the operation of each mode of the biometric information measuring system according to an embodiment of the present invention. The mode of the biometric information measurement system may include three modes: an invasive mode, a single mode, and an array mode.

Invasive mode is the mode that takes on the role of precise blood glucose measurement among the three modes. It is a mode that measures blood glucose changes diffused in the interstitial fluid layer at 5-minute intervals through an ultra-small EM sensor with a diameter of less than 3 mm that can be inserted with a syringe under the skin. can The sensor for the invasive mode scans electromagnetic waves around the sensor at a dense frequency over a wide band, and the change in permittivity according to the change in blood sugar can be precisely measured through the characteristic analysis of the reflected EM for each frequency. In this invasive mode, compared to the EM-based non-invasive externally attached blood glucose sensor, the influence of pressure, temperature, humidity, movement, etc. during measurement is excluded, thereby enabling accurate blood glucose measurement.

The single mode is a mode in charge of blood glucose measurement in a wider area, although the accuracy is slightly lower than that of the invasive mode. Through an EM sensor attached to the skin surface outside the body, the change in blood glucose in the interstitial fluid layer identical to that of the invasive mode is measured at 5-minute intervals. can be a mod The single-mode sensor is a non-invasive blood glucose sensing mode that measures blood glucose by analyzing changes in electromagnetic waves penetrating into the interstitial fluid layer from changes in coupling between two EM sensors. That is, the single mode determines the approximate range of blood glucose over a rather coarse but wide area (coarse scanning), and the invasive mode scans precisely within the determined range (fine scanning), and the fusion of Mode1 and Mode2 sensing information (fusion) ), it is possible to implement heterogeneous sensor redundancy that enables accurate blood glucose measurement in a wide range of 40 to 600 mg/dl.

Array mode is a mode that is in charge of detecting the risk in real time when there is a large change in blood sugar, although the accuracy is much lower. It may be a real-time monitoring mode. The array mode sensor operates several EM sensors simultaneously and in parallel to increase the penetration depth of the EM, and can sense rapid changes in blood glucose in blood vessels in real time. Since the blood glucose value in the interstitial fluid layer has a time delay of about 5 to 20 minutes compared to the actual blood glucose value in the blood vessel, the array mode can implement real-time blood glucose measurement through the blood glucose change in the blood vessel.

7 is a diagram illustrating a propagation pattern for each mode of a blood glucose measurement sensor according to an embodiment of the present invention. Examples are shown in which radio waves reach the subcutaneous fat layer in mode 1, the invasive mode, mode 2, single mode, to part of the muscle layer, and mode 3, array mode, to blood vessels.

8 is a graph showing response curves of scattering parameters of an implant device and an external device in a system for measuring biometric information according to an embodiment of the present invention. The graphs of FIG. 8 show changes in resonance frequencies of the implant device 100 and the external device 200 according to changes in biometric information (eg, blood sugar). When the dielectric constant of the implant device 100 increases, a phenomenon in which the blood sugar level decreases is derived by simulation. When the blood sugar level increases, the dielectric constant decreases and the resonance frequency increases.

Since the area of the frequency generation system for generating a frequency for driving an internal sensor (eg, implant device 100) is large, in embodiments of the present invention, in order to overcome this, an external (eg, external device) (200)) may transmit a frequency to an internal sensor.

In this biometric information measurement system, a frequency of 13.56 MHz can be used for wireless power transmission and data transmission, but is not limited thereto. Power can be supplied from the external device 200 to the implant device 100 without a separate power supply unit such as a battery through a wireless power transmission technique, and power can be supplied to the sensor interface 120 of the implant device 100. can be supplied. The external device 200 generates a sweeping frequency matching the frequency of several gigahertz at regular intervals for driving the implant device 100 through the external reading module 400, and the implant device 100 can be forwarded to

The frequency transmitted from the external device 200 to the implant device 100 may drive the EM-based sensor 110 . At this time, the EM-based sensor 110 changes the S-parameter characteristics by changing the permittivity of the surrounding blood sugar.

The value of the scattering parameter S11 is lowered at a specific resonant frequency. To find the lowest point, the external device 200 performs a frequency sweep over a wide band through the external reading module 400 and transfers the frequency sweep to the implant device 100 . Each frequency characteristic reflected from the EM-based sensor 110 is frequency selective according to the concentration of the surrounding target material (eg, blood sugar) as in the EM-based sensor 110 by the frequency selective filter 124 The characteristics of may be changed and filtered. Each frequency may be transmitted to the envelope detector 122, and a minimum value may be found in the envelope detector 122. If the size of the output from the envelope detector is too large or too small, it may affect the input of the ADC 123. The size of the input signal can be adjusted to an input of 30 dB or more. The adjusted output from the baseband amplifier enters the input of the ADC 123 and is converted into digital signals of 0 and 1, and then through back scattering communication techniques such as LSK (Load Shift Keying) modulation. It can be delivered to the external external device 200. The external device 200 can generate data on biometric information using a digital signal (digital data) transmitted from the implant device 100, and another external device (for example, a smartphone) through a communication module. The generated data can be passed.

9 is a diagram illustrating an example of a method for measuring biometric information of an implant device according to an embodiment of the present invention. The biometric information measurement method according to the present embodiment may be performed by the implant device 100 described above.

In operation 910, the implant device 100 may receive an RF signal of a specific frequency transmitted by the external device 200. The RF signal received here may include power transmitted through wireless power transmission and may be utilized for driving the implant device 100 .

In step 920, the implant device 100 applies the frequency selection filter 124 to the signal reflected by the EM-based sensor 110 included in the implant device according to the frequency-swept signal transmitted from the external device 200. can be filtered through. Blood sugar can be measured based on the characteristic that the resonant frequency changes according to the permittivity of the surroundings of the implant device 100. To this end, the external device 200 generates a signal while sweeping the frequency through the phase-locked loop 410. It can be delivered to the implant device 100. In this case, the implant device 100 may receive signals reflected by the EM-based sensor 110 and filter them through the frequency selection filter 124, thereby outputting signals of filtered frequencies.

In operation 930, the implant device 100 converts the filtered signal into a DC level through the envelope detector 122 to find a minimum value.

In operation 940, the implant device 100 may convert the signal including the minimum value into digital data. For example, the implant device 100 may amplify a signal including a minimum value to a predetermined level or more with the amplifier 125, and convert the amplified signal into digital data with the ADC 123.

In operation 950, the implant device 100 may transmit digital data to the external device 200. It has been described above that digital data can be transmitted to the external device 200 using the SWIPT IC.

10 is a diagram illustrating an example of a method for measuring biometric information of an external device according to an embodiment of the present invention. The biometric information measuring method according to the present embodiment may be performed by the external device 200 described above.

In step 1010, the external device 200 sends a signal to the implant device 100 while sweeping a frequency through the phase-locked loop 410 to drive the EM-based sensor 110 included in the implant device 100. can be sent to

In step 1020, the external device 200 may provide power for driving the implant device 100 through a power amplifier. For example, the external device 200 may transmit an RF signal of a specific frequency to the implant device 100 through the power amplifier 210 .

In step 1030, the external device 200 implants digital data converted from a signal including the minimum value detected by the implant device 100 among signals reflected by the EM-based sensor 110 according to the frequency-swept signal. can be received from the device. In this case, the external device 200 may measure blood sugar based on the characteristic that the resonant frequency changes according to the permittivity around the implant device.

At this time, according to embodiments of the present invention, blood sugar can be accurately measured by measuring characteristic changes according to blood sugar changes through the implant device and the external device.

The device described above may be implemented as a hardware component or a combination of hardware components and software components. For example, devices and components described in the embodiments include a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA), and a programmable PLU (programmable logic unit). logic unit), microprocessor, or any other device capable of executing and responding to instructions. The processing device may run an operating system (OS) and one or more software applications running on the operating system. A processing device may also access, store, manipulate, process, and generate data in response to execution of software. For convenience of understanding, there are cases in which one processing device is used, but those skilled in the art will understand that the processing device includes a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that it can include. For example, a processing device may include a plurality of processors or a processor and a controller. Other processing configurations are also possible, such as parallel processors.

Software may include a computer program, code, instructions, or a combination of one or more of the foregoing, which configures a processing device to operate as desired or processes independently or collectively. You can command the device. The software and/or data may be embodied in any tangible machine, component, physical device, computer storage medium or device to be interpreted by or to provide instructions or data to a processing device. there is. Software may be distributed on networked computer systems and stored or executed in a distributed manner. Software and data may be stored on one or more computer readable media.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. In this case, the medium may continuously store a program executable by a computer or temporarily store the program for execution or download. In addition, the medium may be various recording means or storage means in the form of a single or combined hardware, but is not limited to a medium directly connected to a certain computer system, and may be distributed on a network. Examples of the medium include magnetic media such as hard disks, floppy disks and magnetic tapes, optical recording media such as CD-ROM and DVD, magneto-optical media such as floptical disks, and ROM, RAM, flash memory, etc. configured to store program instructions. In addition, examples of other media include recording media or storage media managed by an app store that distributes applications, a site that supplies or distributes various other software, and a server.

As described above, although the embodiments have been described with limited examples and drawings, those skilled in the art can make various modifications and variations from the above description. For example, the described techniques may be performed in an order different from the method described, and/or components of the described system, structure, device, circuit, etc. may be combined or combined in a different form than the method described, or other components may be used. Or even if it is replaced or substituted by equivalents, appropriate results can be achieved.

Therefore, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims.

Claims (14)

an implant device inserted into the body to measure biometric information; and
An external device that transmits a signal while sweeping a frequency to the implant device
including,
The implant device,
an EM (Electro-Magnetic) based sensor that reflects a signal transmitted by the external device; and
A sensor interface that measures the power level of a signal reflected from the EM-based sensor and converts it into digital data
including,
The sensor interface,
a frequency selection filter filtering characteristics of frequency selection according to the concentration of target substances in the body; and
Envelope detector for finding and outputting a minimum value in the frequencies output by the frequency selection filter
to include
Biometric information measurement system characterized by. According to claim 1,
The biometric information measurement system, characterized in that the biometric information is measured based on the characteristic that the resonant frequency changes according to the permittivity of the surroundings of the implant device. delete delete According to claim 1,
The envelope detector is implemented to find the lowest point by converting the signal reflected from S11 among the S-parameters to a DC (Direct Current) level
Biometric information measurement system characterized by. According to claim 1,
The sensor interface,
an amplifier that adjusts the level of the output of the envelope detector to a level greater than or equal to a predetermined level; and
ADC (Analog-Digital Converter) that receives the output of the amplifier and converts it into digital data
to further include
Biometric information measurement system characterized by. According to claim 1,
The external device includes a wireless power transmission unit for transmitting wireless power to the implant device,
The implant device includes a wireless power receiver for receiving wireless power transmitted by the external device.
Biometric information measurement system characterized by. According to claim 1,
The external device,
A phase-locked loop that sweeps a frequency to drive an EM-based sensor included in the implant device; and
A power amplifier providing power for driving the implant device
to include
Biometric information measurement system characterized by. According to claim 8,
The external device,
Further comprising a data recovery module for recovering digital data transmitted from the implant device
Biometric information measurement system characterized by. According to claim 8,
The external device is a communication module for communicating with other external devices.
to further include
Biometric information measurement system characterized by. According to claim 8,
The external device,
At least one EM-based sensor that measures biometric information in the body outside the body
to further include
Biometric information measurement system characterized by. In the method of measuring biometric information performed by an implant device,
Receiving a radio frequency (RF) signal of a specific frequency transmitted by an external device;
filtering a signal reflected by an electro-magnetic (EM)-based sensor included in the implant device according to a signal whose frequency is swept from the external device through a frequency selection filter;
converting the filtered signal to a direct current (DC) level through an envelope detector to find a minimum value;
converting the signal including the minimum value into digital data; and
Transmitting the digital data to the external device
Biometric information measurement method comprising a. In the method of measuring biometric information performed by an external device,
Transmitting a signal to the implant device while sweeping a frequency through a phase-locked loop to drive an electro-magnetic (EM)-based sensor included in the implant device;
providing power for driving the implant device through a power amplifier; and
Receiving from the implant device digital data converted from a signal including a minimum value detected by the implant device among signals reflected by the EM-based sensor according to the frequency-swept signal
Biometric information measurement method comprising a. According to claim 12 or 13,
The biometric information measurement method characterized in that the biometric information is measured based on the characteristic that the resonant frequency changes according to the permittivity of the surroundings of the implant device.

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