WO2020196099A1 - データ取得装置、及び生体センサ - Google Patents
データ取得装置、及び生体センサ Download PDFInfo
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- WO2020196099A1 WO2020196099A1 PCT/JP2020/011737 JP2020011737W WO2020196099A1 WO 2020196099 A1 WO2020196099 A1 WO 2020196099A1 JP 2020011737 W JP2020011737 W JP 2020011737W WO 2020196099 A1 WO2020196099 A1 WO 2020196099A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/30—Input circuits therefor
- A61B5/304—Switching circuits
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/251—Means for maintaining electrode contact with the body
- A61B5/257—Means for maintaining electrode contact with the body using adhesive means, e.g. adhesive pads or tapes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/25—Bioelectric electrodes therefor
- A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
- A61B5/28—Bioelectric electrodes therefor specially adapted for particular uses for electrocardiography [ECG]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/30—Input circuits therefor
- A61B5/307—Input circuits therefor specially adapted for particular uses
- A61B5/308—Input circuits therefor specially adapted for particular uses for electrocardiography [ECG]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
- A61B5/332—Portable devices specially adapted therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/683—Means for maintaining contact with the body
- A61B5/6832—Means for maintaining contact with the body using adhesives
- A61B5/6833—Adhesive patches
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0204—Operational features of power management
- A61B2560/0209—Operational features of power management adapted for power saving
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/029—Operational features adapted for auto-initiation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
Definitions
- the present invention relates to a data acquisition device and a biosensor.
- biosensor using a biocompatible polymer substrate including a plate-shaped first polymer layer, a plate-shaped second polymer layer, an electrode, and a data acquisition module (see, for example, Patent Document 1). ).
- the data acquisition device is It has a first terminal to which a switching signal for switching master / slave is input at the start of data acquisition, an A / D converter for converting the input analog data into digital data, and an output terminal for outputting the digital data.
- An integrated circuit set to either master or slave by the switching signal, When the integrated circuit is a slave, it sets itself as a master, and when the integrated circuit is a master, it sets itself as a slave, and is connected to the switching setting unit that generates the switching signal and the first terminal.
- An information processing device including a second terminal for outputting a switching signal and an input terminal connected to the output terminal for inputting the digital data. The integrated circuit outputs the digital data from the output terminal when the self is set to the master by the switching signal input from the information processing apparatus.
- the biosensor connects the electrode in contact with the subject, a data acquisition device for processing analog electrocardiographic data acquired through the electrode, and the electrode and the data acquisition device.
- the data acquisition device including the wiring, The first terminal to which a switching signal for switching master / slave is input at the start of acquisition of electrocardiographic data from the subject, and A / D conversion for converting analog electrocardiographic data input from the electrode into digital electrocardiographic data.
- An integrated circuit having a device and an output terminal for outputting the digital electrocardiographic data and being set to either a master or a slave by the switching signal.
- the integrated circuit When the integrated circuit is a slave, it sets itself as a master, and when the integrated circuit is a master, it sets itself as a slave, and is connected to the first terminal with a switching setting unit that generates the switching signal. It has an information processing device having a second terminal for outputting a switching signal and an input terminal connected to the output terminal for inputting the digital electrocardiographic data.
- the integrated circuit outputs the digital electrocardiographic data from the output terminal when the self is set to the master by the switching signal input from the information processing apparatus.
- FIG. 1 is a diagram showing a data acquisition device 150 of the embodiment.
- the data acquisition device 150 is connected to a terminal, an electrode, or the like of an arbitrary device such as a sensor 300 to acquire target data.
- the sensor 300 is, for example, a sensor that detects biological signals representing an electrocardiographic waveform, an electroencephalogram, a pulse, and the like, but is not limited to this example.
- the form in which the sensor 300 is a sensor that detects a biological signal (analog electrocardiographic data) representing an electrocardiographic waveform will be described, but the sensor 300 detects signals other than biological signals such as temperature, light, pressure, and geomagnetism. It may be a sensor that does.
- the data acquisition device 150 includes an ASIC (application specific integrated circuit) 150A, an MPU (Micro Processing Unit) 150B, a memory 150C, a bus 150D, 150E, a crystal oscillator 60, 70, an RC oscillator 80, and It has a switch 90.
- Buses 150D and 150E are SPI (Serial Peripheral Interface) buses as an example.
- the ASIC 150A is connected to the sensor 300, and inside the data acquisition device 150, it is connected to the MPU 150B via the bus 150D. Further, a crystal oscillator 60 is connected to the ASIC 150A.
- the ASIC 150A has an ADC (Analog to Digital Converter, AD converter) 151A and a terminal 152A. Components other than the ADC 151A and the terminal 152A of the ASIC 150A will be described later with reference to FIG.
- ADC Analog to Digital Converter
- the ASIC150A has a terminal corresponding to the SPI interface.
- the ASIC 150A can be either a master device or a slave device for the MPU 150B.
- being a master device is referred to as a master
- being a slave device is referred to as a slave.
- Master / slave switching is performed by the MPU150B.
- the master is a device that controls the control of the plurality of devices when the plurality of devices perform a cooperative operation.
- a slave is a device that operates according to a command or control from a master when a plurality of devices perform a cooperative operation. While the data acquisition device 150 acquires data from the sensor 300, the ASIC 150A is set as the master and the MPU 150B is set as the slave to suppress power consumption.
- the ADC 151A is a SAR (Successive Approximation Register) / SF (Stochastic Flash) type AD converter, and for example, the A / D converter described in JP-A-2016-092648 may be used. Can be done.
- the ADC 151A converts the analog electrocardiographic data acquired by the sensor 300 into digital electrocardiographic data and outputs it to the MPU 150B.
- the terminal 152A is connected to the MPU 150B via the bus 150D.
- there are a plurality of terminals 152A including an M / S terminal for outputting a switching signal, an SS (Slave Select) terminal, a MISO (Master In Slave Out) terminal, a MOSI (Master Out Slave In) terminal, a CLK terminal, and the like. ..
- the M / S terminal of the terminals 152A is an example of the first terminal to which the switching signal for switching the master / slave is input from the MPU 150B.
- the MOSI terminal of the terminals 152A is an example of an output terminal in which the ASIC 150A outputs digital electrocardiographic data to the MPU 150B when the ASIC 150A is the master and the MPU 150B is the slave.
- the ASIC 150A divides the 32 MHz clock oscillated by the crystal oscillator 60 to generate a 4 MHz system clock used internally. This configuration will be described later with reference to FIG.
- the MPU 150B is an example of an information processing device, and is connected to the ASIC 150A via the bus 150D and to the memory 150C via the bus 150E.
- the RC oscillator 80 and the crystal oscillator 70 are connected to the MPU 150B via a switch 90.
- the switch 90 is a switch that selectively connects either one of the crystal oscillator 70 and the RC oscillator 80 to the MPU 150B, and the MPU 150B switches between the master and the slave.
- the RC oscillator 80 outputs a clock having a lower frequency than the clock output by the crystal oscillator 70.
- the RC oscillator 80 has a lower clock frequency and lower accuracy than the crystal oscillator 70, but consumes less power than the crystal oscillator 70.
- the crystal oscillator 70 and RC oscillator 80 can be turned on / off by the MPU150B. When the crystal oscillator 70 is on, the RC oscillator 80 is turned off, and when the RC oscillator 80 is on, the crystal oscillator 70 is turned off.
- the MPU 150B has a main control unit 151B, a switching setting unit 152B, a calculation unit 153B, a memory 154B, and terminals 155B and 156B.
- the main control unit 151B, the switching setting unit 152B, and the calculation unit 153B represent the functions realized by the computer that realizes the MPU 150B, and the memory 154B functionally represents the memory of the computer that realizes the MPU 150B. Is.
- the main control unit 151B is a processing unit that controls the processing of the MPU 150B, and executes processing other than the processing executed by the switching setting unit 152B and the calculation unit 153B.
- the switching setting unit 152B sets the MPU 150B to either the master or the slave. Further, the switching setting unit 152B generates a switching signal for switching the master / slave of the ASIC 150A, and outputs the switching signal to the ASIC 150A.
- the calculation unit 153B executes a process of calculating the added value of the digital electrocardiographic data input from the ASIC 150A and a process of calculating the average value of the added values.
- the calculation unit 153B performs an addition process each time digital electrocardiographic data is acquired from the ASIC 150A, and calculates an average value each time an additional value of eight digital electrocardiographic data is obtained.
- the calculation unit 153B calculates the average value, it stores it in the memory 150C.
- the memory 154B stores programs and data necessary for the main control unit 151B, the switching setting unit 152B, and the calculation unit 153B of the MPU 150B to execute processing. Further, the memory 154B holds the added value obtained by the addition process of the calculation unit 153B.
- terminals 155B There are actually a plurality of terminals 155B, including an M / S terminal, an SS terminal, a MISO terminal, a MOSI terminal, a CLK terminal, etc. that output a switching signal.
- the M / S terminal is an example of a second terminal that outputs a switching signal
- the MOSI terminal is connected to the terminal 152A of the ASIC150A, and when the ASIC150A is the master and the MPU150B is the slave, the digital electrocardiogram is transmitted from the ASIC150A.
- This is an example of an input terminal into which data is input.
- the terminal 156B is connected to the PC 50 via the memory 150C and the cable 51, and outputs electrocardiographic data to the memory 150C when the MPU 150B is a slave.
- the MPU 150B generates a system clock to be used internally based on the clock oscillated by the crystal oscillator 70 or the RC oscillator 80. More specifically, the main control unit 151B performs a process of oscillating the crystal oscillator 70. The main control unit 151B and the crystal oscillator 70 construct a crystal oscillator.
- the main control unit 151B sets the system clock frequency high (32 MHz as an example) in order to set the operating frequency high, and when the MPU150B is the slave, the system clock is set to lower the operating frequency.
- the frequency of is set low (4 MHz as an example).
- the main control unit 151B switches the crystal oscillator 70 and the RC oscillator 80 on / off.
- the frequency of the clock output by the crystal oscillator 70 is 32 MHz as an example, and the frequency of the clock output by the RC oscillator 80 is 16 MHz as an example.
- the main control unit 151B generates the system clock of the MPU 150B from the clock output from either the crystal oscillator 70 or the RC oscillator 80 by switching the switch 90.
- the main control unit 151B uses the 32 MHz clock output by the crystal oscillator 70 as it is as the system clock. Further, when the MPU 150B is the master, the main control unit 151B divides the 32 MHz clock output by the crystal oscillator 70 and generates a 4 MHz clock in addition to the 32 MHz system clock. When the MPU 150B is the master, the MPU 150B outputs a 4 MHz clock to the ASIC 150A together with the switching signal when the switching signal or the like is output to the ASIC 150A. The 4 MHz clock is output to the ASIC 150A from the CLK terminal of the terminals 155B.
- the main control unit 151B divides the clock of the RC oscillator 80 to generate a 4 MHz system clock, and uses the CS (Chip Select) signal input from the ASIC 150A as a trigger to trigger the system clock timing. To correct. In this way, when the MPU 150B is a slave, the main control unit 151B synchronizes the 4 MHz system clock obtained by dividing the clock of the RC oscillator 80 with the CS signal. Further, when the MPU 150B is a slave and outputs a switching signal or the like to the ASIC 150A, the MPU 150B outputs a 4 MHz system clock to the ASIC 150A together with the switching signal or the like. The 4 MHz clock is output to the ASIC 150A from the CLK terminal of the terminals 155B.
- CS Chip Select
- a 4MHz system clock is generated based on the clock of the RC oscillator 80 in order to reduce the power consumption of the MPU150B by lowering the frequency of the system clock.
- the crystal oscillator 70 is used when the MPU 150B is the master, and is not used when the MPU 150B is the slave.
- the memory 150C is connected to the MPU 150B via the bus 150E.
- the memory 150C is, for example, a NAND flash memory, and has a capacity required for storing the target data.
- the sensor 300 is a stick-on biosensor, it has a capacity capable of storing a required amount of electrocardiographic data acquired from the stick-on biosensor.
- the stick-on biosensor is attached to the chest of a living body for about 24 hours to acquire analog electrocardiographic data.
- the memory 150C has a capacity capable of storing at least 24 hours of electrocardiographic data.
- the MPU 150B may perform addition averaging processing on the digital electrocardiographic data input from the ASIC 150A, and then store the processed data in the memory 150C.
- the memory 150C has a terminal 151C.
- a cable 51 connected to the PC 50 can be connected to the terminal 151C.
- the electrocardiographic data stored in the memory 150C can be transferred to the PC 50 via the cable 51.
- FIG. 2 is a diagram showing the configuration of the ASIC 150A.
- the ASIC150A includes an input terminal (VINP) 201, an input terminal (VINN) 202, a CLK terminal 203, a terminal 152A, an LNA (Low Noise Amplifier) 210, a BUF (Buffer, a buffer) 220, an LPF (Low Pass Filter) 230, an ADC 151A, It includes a bias circuit 240, a clock generator 250, an oscillator 260, a control unit 270, and a level shifter 280.
- VNP input terminal
- VINN input terminal
- CLK terminal 203 a terminal 152A
- LNA Low Noise Amplifier
- BUF Buffer, a buffer
- LPF Low Pass Filter
- the ASIC150A includes a VREG terminal, a VCOM terminal, a VMID terminal, a VCS terminal, a TAB terminal (GND potential), a GND terminal, a VDD terminal (1.2), a VDDLV terminal (1.5V to 2.5V), and the like. including.
- Input terminals 201 and 202 are connected to the sensor 300.
- a + (positive) signal is input to the input terminal 201, and a- (negative) signal is input to the input terminal 201.
- the CLK terminal 203 is connected to a crystal oscillator 60 provided outside the ASIC 150A.
- the terminal 152A is connected to the MPU150B as described with reference to FIG. 1, and is an M / S terminal, an SS terminal, a MISO terminal, a MOSI terminal, and a CLK terminal.
- the LNA 210 is connected between the input terminals 201 and 202 and the BUF 220, and amplifies and outputs the analog electrocardiographic data input from the input terminals 201 and 202.
- the BUF 220 is connected between the LNA 210 and the ADC 151A, and shapes the waveform of the analog electrocardiographic data amplified by the LNA 210 and outputs it to the LPF 230.
- the LPF 230 is connected between the BUF 220 and the ADC 151A, and passes only a predetermined band component on the low frequency side of the analog electrocardiographic data input from the BUF 220 in order to remove noise.
- the ADC 151A operates based on the clock signal input from the clock generator 250, converts the analog electrocardiographic data input from the LPF 230 into digital electrocardiographic data, and outputs it to the control unit 270.
- the clock signal input from the clock generator 250 is a clock signal that determines the sampling period of the ADC 151A, and is 4 MHz as an example.
- the frequency of the clock signal input from the clock generator 250 is set lower than the system clock (32 MHz as an example) used inside the MPU 150B when the MPU 150B is the master.
- the bias circuit 240 converts the power supply voltage (1.2V) input to the VCS terminal into the voltage required by the ADC 151A (0.5V and 0.25V as an example) and outputs the voltage.
- the bias circuit 240 is, for example, a voltage divider circuit.
- the clock generator 250 includes a PLL (Phase Locked Loop) and a frequency divider, and generates a clock having a predetermined frequency (4 MHz as an example) from the clocks input from the crystal oscillator 60 and the oscillator 260 to generate the ADC 151A and the control unit. Output to 270 etc.
- the clock generator 250 divides the 32 MHz clock output from the crystal oscillator 60 to generate a 4 MHz system clock internally used by the ASIC 150A.
- the clock generator 250 outputs the divided 4 MHz system clock to the ADC 151A, the control unit 270, and the like.
- the oscillator 260 is an IC (Integrated Circuit) that oscillates the crystal oscillator 60.
- the oscillator 260 and the crystal oscillator 60 construct a crystal oscillator.
- the oscillator 260 and the crystal oscillator 60 oscillate a clock of 32 MHz as an example.
- the control unit 270 is realized by a combinational circuit and has a register 271.
- the control unit 270 exchanges data between the ADC 151A and the level shifter 280.
- the control unit 270 operates according to the content of the command based on the command input from the terminal 152A via the level shifter 280. For example, the control unit 270 switches the master / slave of the ASIC 150A based on the switching signal input from the M / S terminal via the level shifter 280.
- the control unit 270 When the ASIC 150A is switched to the master based on the switching signal from the MPU 150B, the control unit 270 outputs a start signal for starting the digital conversion process to the ADC 151A to the ADC 151A and outputs a CS signal to the MPU 150B.
- the control unit 270 causes the clock generator 250 to output the clock for AD conversion synchronization, and outputs the clock for AD conversion synchronization to the MPU 150B.
- the clock for synchronizing the start signal, the CS signal, and the AD conversion is synchronized with the system clock of the ASIC150A.
- the clock for synchronization of AD conversion and the system clock are both 4 MHz clocks, which are the same clocks.
- the start signal is output from the register 271 to the ADC 151A only once when the ADC 151A starts the digital conversion process. More specifically, when the ADC 151A starts the digital conversion process, an H level pulse is output from the register 271 to the ADC 151A only once.
- the CS signal is output from the control unit 270 to the MPU 150B from the SS terminal of the terminal 152A via the level shifter 280.
- the CS signal is a signal output by the control unit 270 to the MPU 150B.
- the CS signal is a synchronization signal for causing the MPU 150B to acquire digital electrocardiographic data.
- the clock for synchronization of AD conversion is a clock for synchronization used when the ADC 151A performs AD conversion, and is output from the clock generator 250 to the ADC 151A.
- the ADC 151A performs AD conversion when the clock for synchronizing AD conversion rises to the H level.
- the ADC 151A performs AD conversion in synchronization with the AD conversion synchronization clock output from the clock generator 250, and the MPU 150B is digital at the timing when the CS signal switches from the H (High) level to the L (Low) level. Capture electrocardiographic data. Therefore, the digital conversion process in the ADC 151A and the data acquisition in the MPU 150B can be synchronized.
- the frequency of the CS signal is, for example, 2 to 8 times higher than the frequency of the system clock on the ASIC150A side.
- the control unit 270 outputs the digital electrocardiographic data output from the ADC 151A to the level shifter 280 when the ASIC 150A is the master.
- the digital electrocardiographic data is output from the level shifter 280 to the MPU 150B via the MOSI terminal.
- the control unit 270 exchanges other commands and data with the MPU 150B via the level shifter 280 and the terminal 152A.
- the register 271 holds the digital electrocardiographic data output from the ADC 151A, the start signal and the CS signal output by the control unit 270 to the ADC 151A, and the like.
- the register 271 is an example of a data holding unit.
- the level shifter 280 adjusts the signal level of data, commands, etc. between the control unit 270 and the terminal 152A.
- FIG. 3 is a timing chart showing the processing of the MPU 150B.
- FIG. 3A shows the timing of a reference example in which the MPU performs the addition process and the averaging process after acquiring the data x 0 to x 7 .
- FIG. 3B shows the timing of an embodiment in which the addition process and the averaging process are performed on the added values each time the MPU 150B acquires each of the data x 0 to x 7 .
- Data x 0 to x 7 are digital electrocardiographic data, and the horizontal axis in FIGS. 3 (A) and 3 (B) represents time.
- the operation of the MPU of the reference example acquires data x 0 to x 7 in order according to the system clock.
- the lengths of the intervals T 0 to T 7 required to acquire each of the data x 0 to x 7 are equal to each other.
- the section Tsa inserted between each section T 0 to T 7 is a section for performing a process of transferring the acquired data to the memory.
- the MPU of the reference example when the first data x 0 to the eighth data x 7 are acquired and transferred to the memory, the data x 0 to x 7 are read from the memory in the interval TA, and the data according to the following equation (1).
- the addition value A of x 0 to x 7 is obtained, and the average value (A / 8) of the addition value A is further obtained.
- the MPU of the reference example starts the process again from the acquisition of the data x 0 in the next cycle after obtaining the average value (A / 8) of the added value A, and repeatedly executes the process shown in FIG. 3 (A). ..
- the MPU 150B has data x from the ASIC 150A at the timing when the CS signal transitions from the H level to the L level at each start point of the sections T 0 to T 7. 0 to get each of the ⁇ x 7. Every time each of the data x 0 to x 7 is acquired, the addition process is performed in the interval Tsb according to the following equation (2). In addition processing is added to the previous sum value A n every time each data x 0 ⁇ x 7 is obtained.
- the added values A 1 to A 8 are obtained in the eight sections Tsb after the data x 0 to x 7 are acquired respectively.
- the added value A 8 is a value obtained by adding the data x 0 to x 7 . Since the start of the section TB is the start of the section T 0 of the next cycle, the MPU 150B outputs data x 0 from the ASIC 150A when the CS signal changes from the H level to the L level at the start of the section T 0. get.
- the MPU 150B performs an addition process of adding according to the equation (2) in the eight sections Tsb after each of the data x 0 to x 7 is acquired.
- the section Tsb in FIG. 3 (B) and the section Tsa in FIG. 3 (A) are both times for leaving a space between tasks so that interrupt processing can be performed when the MPU 150B processes in the background. .. Therefore, the section Tsb in FIG. 3 (B) and the section Tsa in FIG. 3 (A) are substantially equal to each other.
- the continuous usable time is about 33 hours to about. This is equivalent to extending to 40 hours. Since the stick-on biosensor using the MPU of the example consumes less power than the stick-on biosensor using the MPU of the reference example, the continuous usable time is extended by about 20%.
- the main control unit 151B of the MPU150B stores and transfers the average value of the sum A 8 a (A 8/8) in the memory 150C.
- the reason for performing the addition averaging process in this way is to reduce the noise level of the digital electrocardiographic data (to improve the S / N ratio).
- FIG. 4 is a flowchart showing the processing of the MPU 150B.
- the flowchart of FIG. 4 is a process from the start to the end of the acquisition and recording of data from the sensor 300 by the MPU 150B, and is repeatedly executed over a fixed period as an example.
- the MPU150B determines whether or not to start acquiring data (step S0). Whether or not the data acquisition has started can be determined by whether or not the data acquisition device 150 is connected to the sensor 300, whether or not the data has been transferred from the sensor 300, whether or not the predetermined time has been reached, and the like. it can. S0 is repeated until data acquisition is started (S0: NO). If data acquisition is started (S0: YES), the switching setting unit 152B sets the switching signal level to "1" and outputs the data to the ASIC 150A, and sets the MPU 150B as a slave (step S1). The ASIC150A is set to the master by the switching signal whose level is "1".
- the calculation unit 153B takes in digital data from the ASIC 150A according to the CS signal (step S3).
- the calculation unit 153B performs an addition process according to the equation (2) (step S4).
- the calculation unit 153B determines whether n is 7 or more (step S5).
- n is incremented (step S6).
- Calculation unit 153B is n is 7 or more in the step S5 (S5: YES) and it is determined, the average value of the sum A 8 a (A 8/8) determining (step S7).
- Calculation unit 153B stores the obtained average value (A 8/8) in the memory 150C (step S8).
- the main control unit 151B determines whether or not the data acquisition is completed (step S9). Whether or not the data acquisition is completed depends on whether or not the data acquisition device 150 is disconnected from the sensor 300, whether or not the data transfer from the sensor 300 has been performed for a certain period of time or longer, and a predetermined time from the start of data acquisition. It can be determined whether or not the data has passed, whether or not the data occupancy rate of the data storage area of the memory 150C exceeds a certain level, and the like. When the sensor 300 is a stick-on type biosensor, as an example, it may be determined that the data acquisition is completed when 24 hours have passed from the start of recording the digital electrocardiographic data.
- the switching setting unit 152B sets the switching signal level to "0" and outputs the data to the ASIC 150A, and sets the MPU 150B to the master. (Step S10).
- the ASIC150A is set as a slave by the switching signal whose level is "0".
- the ADC 151A terminates the digital conversion process. Therefore, the ASIC 150A causes the ADC 151A to perform digital conversion processing while the switching signal is at the "1" level, and when the switching signal is switched to the "0" level, the ADC 151A ends the digital conversion processing. That is, the ADC 151A continues to perform the digital conversion process while the ASIC 150A is the master.
- the total value of digital data is obtained over the data acquisition period, the averaging processing is performed, and the data is stored in the memory 150C.
- the addition process is sequentially performed according to the equation (2) in each of the sections Tsb following the data acquisition.
- the section TB after obtaining the 8 th addition value A 8 since only obtains the average value of the sum A 8 a (A 8/8), can shorten the processing time for obtaining the average value of the sum, consumption Power can be reduced.
- Data acquisition device 150 while the MPU150B is seeking additional value A n + 1 shown in FIG. 3 (B), seeking an average value of the sum A 8 a (A 8/8), set ASIC150A to master, MPU150B To be a slave.
- the frequency of the system clock of the MPU 150B is lowered to 4 MHz, which is equal to the sampling frequency of the ADC 151A. This also makes it possible to reduce power consumption.
- the MPU 150B Since the MPU 150B takes in digital electrocardiographic data from the ASIC 150A when the CS signal transitions to the L level with the self set as a slave, the MPU 150B can output the digital electrocardiographic data even if the MPU 150B does not request the ASIC 150A to transmit the digital electrocardiographic data. Can be obtained. Therefore, the MPU 150B can immediately take in the digital electrocardiographic data acquired from the ADC 151A by the control unit 270, and has good real-time performance. Therefore, it is possible to provide the data acquisition device 150 having good real-time performance.
- the mode in which the number of data to be added in one cycle is eight when the MPU 150B calculates the average value of the added values has been described, but the number of data of the added values when calculating the average value of the added values is Any number may be used as long as it is 2 or more.
- the MPU 150B may generate a system clock to be used internally based on the clock oscillated by the crystal oscillator 60 connected to the ASIC 150A when it is the master.
- the MPU 150B may obtain a clock for the crystal oscillator 60 to oscillate from the ASIC 150A.
- the data acquisition device 150 does not have to include the crystal oscillator 70 and the switch 90.
- the main control unit 151B generates a system clock based on the clock oscillated by the crystal oscillator 60 when the MPU 150B is the master, and the RC oscillator 80 oscillates when the MPU 150B is the slave.
- the system clock may be generated based on this.
- FIG. 5 is an exploded view showing the biosensor 100 of the embodiment.
- FIG. 6 is a diagram showing a cross section in a completed state corresponding to the cross section taken along the line AA of FIG.
- the biosensor 100 includes, as main components, a pressure-sensitive adhesive layer 110, a base material layer 120, a circuit unit 130, a substrate 135, a probe 140, a fixing tape 145, a data acquisition device 150, a battery 160, and a cover 170.
- the XYZ coordinate system will be defined and explained.
- the negative side of the Z axis opposite to the stacking direction is referred to as the lower side or the lower side
- the positive side of the Z axis along the stacking direction is referred to as the upper side or the upper side, but does not represent a universal hierarchical relationship.
- a biological sensor 100 that is brought into contact with a living body as a subject to measure biological information
- the living body means a human body and an organism other than the human body, and is attached to the skin, scalp, forehead, or the like.
- each member constituting the biosensor 100 will be described.
- the electrode that comes into contact with the living body as a subject is referred to as a probe 140, and a fixing tape 145 will be used as an example of the joint portion.
- a pair of electrodes as the probe 140 is provided in order to measure biological information in a single channel.
- Single channel means to acquire one biometric information from a pair of (two) electrodes.
- the biosensor 100 is a sheet-like sensor having a substantially elliptical shape in a plan view.
- the lower surface (the surface on the ⁇ Z direction side) of the biological sensor 100 is a sticking surface to be attached to the skin 10 of the living body.
- the upper surface (the surface opposite to the sticking surface) of the biosensor 100 is covered with the cover 170.
- the circuit unit 130 and the substrate 135 are mounted on the upper surface of the substrate layer 120. Further, the probe 140 is embedded in the pressure-sensitive adhesive layer 110 so as to be exposed on the lower surface 112 of the pressure-sensitive adhesive layer 110.
- the lower surface 112 (see FIG. 6) of the pressure-sensitive adhesive layer 110 is a surface to which the biosensor 100 is attached.
- the pressure-sensitive adhesive layer 110 is a flat-plate adhesive layer.
- the pressure-sensitive adhesive layer 110 has a longitudinal direction in the X-axis direction and a lateral direction in the Y-axis direction.
- the pressure-sensitive adhesive layer 110 is supported by the base material layer 120, and is attached to the lower surface 121 of the base material layer 120 on the ⁇ Z direction side.
- the pressure-sensitive adhesive layer 110 has an upper surface 111 and a lower surface 112.
- the upper surface 111 and the lower surface 112 are flat surfaces.
- the pressure-sensitive adhesive layer 110 is a layer in which the biological sensor 100 comes into contact with the living body. Since the lower surface 112 has pressure-sensitive adhesiveness, it can be attached to the skin 10 of a living body.
- the pressure-sensitive adhesive layer 110 has a through hole 113.
- the through hole 113 has the same size and position as the through hole 123 of the base material layer 120 in a plan view, and communicates with the through hole 123.
- the material of the pressure-sensitive adhesive layer 110 is not particularly limited as long as it has pressure-sensitive adhesiveness, and examples thereof include materials having biocompatibility.
- Examples of the material of the pressure-sensitive adhesive layer 110 include an acrylic pressure-sensitive adhesive and a silicone-based pressure-sensitive adhesive. Acrylic pressure-sensitive adhesives are preferable.
- Acrylic pressure-sensitive adhesive contains acrylic polymer as the main component.
- Acrylic polymer is a pressure-sensitive adhesive component.
- the acrylic polymer contains a (meth) acrylic acid ester such as isononyl acrylate and methoxyethyl acrylate as a main component, and a monomer component copolymerizing with a (meth) acrylic acid ester such as acrylic acid as an optional component.
- a polymer obtained by polymerizing the above can be used.
- the content of the main component in the monomer component is 70% by mass to 99% by mass, and the content of the optional component in the monomer component is 1% by mass to 30% by mass.
- the acrylic polymer for example, the (meth) acrylic acid ester-based polymer described in JP-A-2003-342541 can be used.
- the acrylic pressure-sensitive adhesive preferably further contains a carboxylic acid ester.
- the carboxylic acid ester contained in the acrylic pressure-sensitive adhesive is a pressure-sensitive adhesive force adjusting agent that reduces the pressure-sensitive adhesive force of the acrylic polymer and adjusts the pressure-sensitive adhesive force of the pressure-sensitive adhesive layer 110.
- the carboxylic acid ester is a carboxylic acid ester compatible with an acrylic polymer.
- the carboxylic acid ester is a trifatty acid glyceryl as an example.
- the content ratio of the carboxylic acid ester is preferably 30 parts by mass to 100 parts by mass, and more preferably 50 parts by mass to 70 parts by mass or less with respect to 100 parts by mass of the acrylic polymer.
- the acrylic pressure-sensitive adhesive may contain a cross-linking agent, if necessary.
- the cross-linking agent is a cross-linking component that cross-links the acrylic polymer.
- examples of the cross-linking agent include polyisocyanate compounds, epoxy compounds, melamine compounds, peroxide compounds, urea compounds, metal alkoxide compounds, metal chelate compounds, metal salt compounds, carbodiimide compounds, oxazoline compounds, aziridine compounds, amine compounds and the like. .. These cross-linking agents may be used alone or in combination.
- the cross-linking agent is preferably a polyisocyanate compound (polyfunctional isocyanate compound).
- the content of the cross-linking agent is preferably, for example, 0.001 part by mass to 10 parts by mass, and more preferably 0.01 part by mass to 1 part by mass with respect to 100 parts by mass of the acrylic polymer.
- the pressure-sensitive adhesive layer 110 preferably has excellent biocompatibility.
- the keratin peeling area ratio is preferably 0% to 50%, more preferably 1% to 15%.
- the load on the skin 10 see FIG. 2
- the keratin exfoliation test is measured by the method described in JP-A-2004-83425.
- the moisture permeability of the pressure-sensitive adhesive layer 110 is preferably 300 (g / m 2 / day) or more, more preferably 600 (g / m 2 / day) or more, and 1000 (g / m 2 / day) or more. Day) or more is more preferable. If the moisture permeability of the pressure-sensitive adhesive layer 110 is 300 (g / m 2 / day) or more, even if the pressure-sensitive adhesive layer 110 is attached to the skin 10 of a living body (see FIG. 2), the skin 10 (FIG. 2). The load of (see) can be suppressed.
- the pressure-sensitive adhesive layer 110 satisfies at least one of the requirements that the keratin peeling area ratio in the keratin peeling test is 50% or less and the moisture permeability is 300 (g / m 2 / day) or more.
- the pressure-sensitive adhesive layer 110 is biocompatible. It is more preferable that the material of the pressure-sensitive adhesive layer 110 satisfies both of the above requirements. As a result, the pressure-sensitive adhesive layer 110 is more stable and has high biocompatibility.
- the thickness between the upper surface 111 and the lower surface 112 of the pressure-sensitive adhesive layer 110 is preferably 10 ⁇ m to 300 ⁇ m.
- the biosensor 100 can be thinned, and in particular, the area other than the data acquisition device 150 and the battery 160 in the biosensor 100 can be thinned.
- the base material layer 120 is a support layer that supports the pressure-sensitive adhesive layer 110, and the pressure-sensitive adhesive layer 110 is adhered to the lower surface of the base material layer 120.
- the circuit unit 130 and the substrate 135 are arranged on the upper surface side of the base material layer 120.
- the base material layer 120 is a flat plate-shaped (sheet-shaped) member made of an insulator. As shown in FIG. 2, the shape of the base material layer 120 in a plan view is the same as the shape of the pressure-sensitive adhesive layer 110 in a plan view, and they are aligned and overlapped in a plan view.
- the base material layer 120 has a lower surface 121 and an upper surface 122.
- the lower surface 121 and the upper surface 122 are flat surfaces.
- the lower surface 121 is in contact with the upper surface 111 of the pressure-sensitive adhesive layer 110 (pressure-sensitive adhesion).
- the base material layer 120 may be made of a flexible resin having appropriate elasticity, flexibility and toughness.
- a thermoplastic resin such as a polyester resin.
- the thickness of the base material layer 120 is preferably 1 ⁇ m to 300 ⁇ m, more preferably 5 ⁇ m to 100 ⁇ m, and even more preferably 10 ⁇ m to 50 ⁇ m.
- the lower limit of the elongation at break of the base material layer 120 is preferably 100% or more, more preferably 200% or more, still more preferably 300% or more. When the elongation at break is 100% or more, the material of the base material layer 120 can have excellent elasticity.
- the upper limit of the elongation at break of the base material layer 120 can be appropriately designed according to the thickness of the base material layer 120 and the like, and may be 2000% or less. The elongation at break is measured with a test piece type 2 at a tensile speed of 5 mm / min according to JIS K 7127 (1999).
- the lower limit of the tensile strength of the base material layer 120 at 20 ° C. is preferably 0.1 N / 20 mm or more, and is preferably 1 N / 20 mm or more. Is more preferable.
- the upper limit of the tensile strength of the base material layer 120 at 20 ° C. can be appropriately designed according to the material and thickness of the base material layer 120, and may be 20 N / 20 mm or less. The tensile strength is measured based on JIS K 7127 (1999).
- the upper limit of the tensile storage elastic modulus E'at 20 ° C. of the base material layer 120 is preferably 2,000 MPa or less, more preferably 1,000 MPa or less, further preferably 100 MPa or less, and even more preferably 50 MPa. It is particularly preferably less than or equal to, and most preferably 20 MPa or less.
- the lower limit of the tensile storage elastic modulus E' can be appropriately designed according to the material and thickness of the base material layer 120, and may be 0.1 MPa or more.
- the tensile storage elastic modulus E'of the base material layer 120 at 20 ° C. is determined by measuring the dynamic viscoelasticity of the base material layer 120 under the conditions of a frequency of 1 Hz and a heating rate of 10 ° C./min.
- the base material layer 120 becomes elastic.
- the base material layer 120 exhibits more elasticity, it is preferable that two or more of the above requirements are satisfied, and it is more preferable that the three requirements are satisfied.
- the peel strength (peel strength) of the base material layer 120 with respect to the copper foil is, for example, preferably 0.5 N / cm or more, more preferably 1.0 N / cm or more, further preferably 2.0 N / cm or more, and 2.5 N. / Cm or more is most preferable.
- peel strength is equal to or higher than the above lower limit value, peeling between the base material layer 120 and the wiring 131 can be more reliably suppressed.
- the peel strength of a sample (base material layer 120 and a laminate of copper foil) having a width of 1 cm is determined by using a tensile tester under the conditions of a peeling angle of 180 degrees and a peeling speed of 30 mm / min. Measured by peeling layer 120 from the copper foil.
- the thickness of the base material layer 120 is preferably 1 ⁇ m to 300 ⁇ m, more preferably 5 ⁇ m to 100 ⁇ m, and even more preferably 10 ⁇ m to 50 ⁇ m.
- the base material layer 120 is formed from the base material composition.
- the base material composition contains a base material resin as a main component.
- the base material resin for example, a flexible resin capable of imparting appropriate elasticity, flexibility and toughness to the base material layer 120 is used.
- the base resin include thermoplastic resins such as polyurethane-based resins, silicone-based resins, acrylic-based resins, polystyrene-based resins, vinyl chloride-based resins, and polyester resin-based resins. From the viewpoint of ensuring that the base material layer 120 has more excellent elasticity, it is preferable to use a polyurethane resin.
- the circuit unit 130 has a wiring 131, a frame 132, and a substrate 133. More specifically, the circuit unit 130 is connected to the electrode via the frame 132, and is connected to the data acquisition device 150 via the wiring 131.
- the biosensor 100 includes two such circuit units 130.
- the wiring 131 and the frame 132 are provided on the upper surface of the substrate 133 and are integrally formed.
- the wiring 131 connects the frame 132 with the data acquisition device 150 and the battery 160.
- the wiring 131 and the frame 132 can be made of copper, nickel, gold, an alloy thereof, or the like.
- the thickness of the wiring 131 and the frame 132 is preferably 0.1 ⁇ m to 100 ⁇ m, more preferably 1 ⁇ m to 50 ⁇ m, and even more preferably 5 ⁇ m to 30 ⁇ m.
- the two circuit units 130 are provided corresponding to the two through holes 113 and 123 of the pressure-sensitive adhesive layer 110 and the base material layer 120, respectively.
- the wiring 131 is connected to the data acquisition device 150 and the terminal 135A for the battery 160 via the wiring of the substrate 135.
- the frame 132 is a rectangular annular conductive member larger than the opening of the through hole 123 of the base material layer 120.
- the substrate 133 has the same shape as the wiring 131 and the frame 132 in a plan view.
- the portion of the substrate 133 where the frame 132 is provided has a rectangular annular shape larger than the opening of the through hole 123 of the base material layer 120.
- the frame 132 and the rectangular annular portion of the substrate 133 on which the frame 132 is provided are provided so as to surround the through hole 123 on the upper surface of the base material layer 120.
- the substrate 133 may be made of an insulator, and for example, a polyimide substrate or a film can be used. Since the base material layer 120 has adhesiveness (tackiness), the substrate 133 is fixed to the upper surface of the base material layer 120.
- the substrate 135 is an insulator substrate on which the data acquisition device 150 and the battery 160 are mounted, and is provided on the upper surface 122 of the substrate layer 120.
- the substrate 135 is fixed by the tackiness (adhesiveness) of the base material layer.
- a polyimide substrate or a film can be used as an example.
- Wiring and terminals 135A for the battery 160 are provided on the upper surface of the substrate 135.
- the wiring of the board 135 is connected to the data acquisition device 150 and the terminal 135A, and is also connected to the wiring 131 of the circuit unit 130.
- Two probes 140 are provided and are a pair of electrodes that come into contact with the subject.
- the probe 140 is an electrode that comes into contact with the skin 10 and detects a biological signal when the pressure-sensitive adhesive layer 110 is attached to the skin 10.
- the biological signal is, for example, an electric signal representing an electrocardiographic waveform and a signal representing analog electrocardiographic data.
- the biological signal represents the potential difference detected by the two probes 140.
- the electrode used as the probe 140 is manufactured by using a conductive composition containing at least a conductive polymer and a binder resin as described later. Further, the electrode is manufactured by punching a sheet-shaped member obtained by using the conductive composition with a mold or the like, and is used as a probe.
- the probe 140 is rectangular in a plan view and has holes 140A arranged in a matrix.
- the hole 140A is larger than the through holes 113 and 123 of the pressure-sensitive adhesive layer 110 and the base material layer 120.
- the ladder-shaped sides of the probe 140 may protrude.
- the electrode used as the probe 140 may have a predetermined pattern shape. Examples of the predetermined electrode pattern shape include a mesh shape, a stripe shape, and a shape in which a plurality of electrodes are exposed from the sticking surface.
- the fixing tape 145 is an example of the joint portion of the present embodiment.
- the fixing tape 145 is, for example, a rectangular annular copper tape.
- An adhesive is applied to the lower surface of the fixing tape 145.
- the fixing tape 145 is provided on the frame 132 so as to surround the four sides of the probe 140 outside the openings of the through holes 113 and 123 in a plan view, and fixes the probe 140 to the frame 132.
- the fixing tape 145 may be a metal tape other than copper.
- the fixing tape 145 may be a non-conductive tape such as a resin tape composed of a non-conductive resin base material and an adhesive, in addition to a tape having a metal layer such as a copper tape.
- a conductive tape such as a metal tape is preferable because the probe 140 can be bonded (fixed) to the frame 132 of the circuit unit 130 and electrically connected.
- the probe 140 is fixed to the frame 132 by a rectangular annular fixing tape 145 that is placed on the four end portions in a state where the four end portions are arranged on the frame 132.
- the fixing tape 145 is adhered to the frame 132 through a gap such as a hole 140A of the probe 140.
- the pressure-sensitive adhesive layer 110A and the base material layer 120A are laminated on the fixing tape 145 and the probe 140 to form a pressure-sensitive adhesive layer.
- the probe 140 is pushed along the inner walls of the through holes 113 and 123, and the pressure-sensitive adhesive layer 110A is pushed into the hole 140A of the probe 140.
- the probe 140 is pushed down to a position where the central portion is substantially flush with the lower surface 112 of the pressure-sensitive adhesive layer 110 while the four end portions are fixed to the frame 132 by the fixing tape 145. Therefore, when the probe 140 is applied to the skin 10 of a living body (see FIG. 2), the pressure-sensitive adhesive layer 110A is adhered to the skin 10 and the probe 140 can be brought into close contact with the skin 10.
- the thickness of the probe 140 is preferably thinner than the thickness of the pressure-sensitive adhesive layer 110.
- the thickness of the probe 140 is preferably 0.1 ⁇ m to 100 ⁇ m, and more preferably 1 ⁇ m to 50 ⁇ m or less.
- peripheral portion surrounding the central portion in the plan view of the pressure-sensitive adhesive layer 110A is located on the fixing tape 145.
- the upper surface of the pressure-sensitive adhesive layer 110A is substantially flat, but the central portion may be recessed below the peripheral portion.
- the base material layer 120A is superposed on a substantially flat upper surface of the pressure sensitive adhesive layer 110A.
- the pressure-sensitive adhesive layer 110A and the base material layer 120A may be made of the same material as the pressure-sensitive adhesive layer 110 and the base material layer 120, respectively. Further, the pressure-sensitive adhesive layer 110A may be made of a material different from that of the pressure-sensitive adhesive layer 110. Further, the base material layer 120A may be made of a material different from that of the base material layer 120.
- the thickness of the pressure-sensitive adhesive layers 110 and 110A is actually 10 ⁇ m to 300 ⁇ m, and the thickness of the base material layers 120 and 120A is 1 ⁇ m to 300 ⁇ m.
- the thickness of the wiring 131 is 0.1 ⁇ m to 100 ⁇ m, the thickness of the substrate 133 is about several hundred ⁇ m, and the thickness of the fixing tape 145 is 10 ⁇ m to 300 ⁇ m.
- the fixing tape 145 may be a non-conductive resin tape or the like. Good.
- the fixing tape 145 covers the side surfaces of the frame 132 and the substrate 133 in addition to the probe 140, and reaches the upper surface of the base material layer 120.
- the fixing tape 145 since the fixing tape 145 only needs to be able to bond the probe 140 and the frame 132, the fixing tape 145 does not have to reach the upper surface of the base material layer 120, does not have to cover the side surface of the substrate 133, and covers the side surface of the frame 132. It does not have to be covered.
- the substrate 133 and the two substrates 135 may be one integrated substrate.
- wiring 131, two frames 132, and terminal 135A are provided on the surface of one substrate, and the data acquisition device 150 and the battery 160 are mounted.
- the electrode used as the probe 140 is preferably manufactured by thermosetting the following conductive composition and molding it.
- the conductive composition contains a conductive polymer, a binder resin, and at least one of a cross-linking agent and a plasticizer.
- polythiophene for example, polythiophene, polyacetylene, polypyrrole, polyaniline, polyphenylene vinylene and the like can be used. These may be used alone or in combination of two or more. Among these, it is preferable to use a polythiophene compound.
- the content of the conductive polymer is preferably 0.20 parts by mass to 20 parts by mass with respect to 100 parts by mass of the conductive composition. When the content is within the above range, excellent conductivity, toughness and flexibility can be imparted to the conductive composition.
- the content of the conductive polymer is more preferably 2.5 parts by mass to 15 parts by mass, and further preferably 3.0 parts by mass to 12 parts by mass with respect to the conductive composition.
- a water-soluble polymer As the binder resin, a water-soluble polymer, a water-insoluble polymer, or the like can be used.
- the binder resin it is preferable to use a water-soluble polymer from the viewpoint of compatibility with other components contained in the conductive composition.
- the water-soluble polymer contains a polymer (hydrophilic polymer) that is completely insoluble in water and has hydrophilicity.
- a hydroxyl group-containing polymer or the like can be used as the water-soluble polymer.
- a hydroxyl group-containing polymer saccharides such as agarose, polyvinyl alcohol (PVA), modified polyvinyl alcohol, or a copolymer of acrylate and sodium acrylate can be used. These may be used alone or in combination of two or more. Among these, polyvinyl alcohol or modified polyvinyl alcohol is preferable, and modified polyvinyl alcohol is more preferable.
- modified polyvinyl alcohol examples include acetacetyl group-containing polyvinyl alcohol and diacetone acrylamide modified polyvinyl alcohol.
- diacetone acrylamide-modified polyvinyl alcohol for example, a diacetone acrylamide-modified polyvinyl alcohol-based resin (DA-modified PVA-based resin) described in JP-A-2016-166436 can be used.
- the content of the binder resin is preferably 5 parts by mass to 140 parts by mass with respect to 100 parts by mass of the conductive composition. When the content is within the above range, excellent conductivity, toughness and flexibility can be imparted to the conductive composition.
- the content of the binder resin is more preferably 10 parts by mass to 100 parts by mass, and further preferably 20 parts by mass to 70 parts by mass with respect to the conductive composition.
- the cross-linking agent and the plasticizer have a function of imparting toughness and flexibility to the conductive composition.
- By imparting flexibility to the molded product of the conductive composition an electrode having elasticity was obtained.
- the probe 140 having elasticity can be produced.
- toughness is a property that achieves both excellent strength and elongation.
- the toughness does not include the property that one of the strength and the elongation is remarkably excellent, but the other is remarkably low, and includes the property of having an excellent balance of both strength and elongation.
- Flexibility is a property that can suppress the occurrence of damage such as breakage at the bent portion after bending the molded body (electrode sheet) of the conductive composition.
- the cross-linking agent cross-links the binder resin.
- the cross-linking agent preferably has reactivity with a hydroxyl group. If the cross-linking agent has reactivity with a hydroxyl group, the cross-linking agent can react with the hydroxyl group of the hydroxyl group-containing polymer when the binder resin is a hydroxyl group-containing polymer.
- cross-linking agent examples include zirconium compounds such as zirconium salts; titanium compounds such as titanium salts; borides such as boric acid; isocyanate compounds such as blocked isocyanate; aldehyde compounds such as dialdehyde such as glyoxal; alkoxyl group-containing compounds and methylol groups. Examples include contained compounds. These may be used alone or in combination of two or more. Of these, a zirconium compound, an isocyanate compound, or an aldehyde compound is preferable from the viewpoint of reactivity and safety.
- the content of the cross-linking agent is preferably 0.2 parts by mass to 80 parts by mass with respect to 100 parts by mass of the conductive composition. When the content is within the above range, excellent toughness and flexibility can be imparted to the conductive composition.
- the content of the cross-linking agent is more preferably 1 part by mass to 40 parts by mass, and more preferably 3.0 parts by mass to 20 parts by mass.
- the plasticizer improves the tensile elongation and flexibility of the conductive composition.
- the plasticizer include glycerin, ethylene glycol, propylene glycol, sorbitol, and polyol compounds such as N-methylpyrrolidone (NMP), dimethylformamide (DMF), NN'-dimethylacetamide (DMAc), and dimethyl sulfoxide.
- NMP N-methylpyrrolidone
- DMF dimethylformamide
- DMAc NN'-dimethylacetamide
- dimethyl sulfoxide examples thereof include aprotic compounds such as (DMSO). These may be used alone or in combination of two or more. Among these, glycerin is preferable from the viewpoint of compatibility with other components.
- the content of the plasticizer is preferably 0.2 parts by mass to 150 parts by mass with respect to 100 parts by mass of the conductive composition. When the content is within the above range, excellent toughness and flexibility can be imparted to the conductive composition.
- the content of the plasticizer is more preferably 1.0 part by mass to 90 parts by mass, and further preferably 10 parts by mass to 70 parts by mass with respect to 100 parts by mass of the conductive polymer.
- At least one of the cross-linking agent and the plasticizer may be contained in the conductive composition.
- the molded product of the conductive composition can improve toughness and flexibility.
- the molded product of the conductive composition can further improve toughness, that is, both tensile strength and tensile elongation, and is flexible. It is possible to improve the sex.
- the conductive composition contains a plasticizer but no cross-linking agent
- the tensile elongation of the molded product of the conductive composition can be improved, and the molded product of the conductive composition as a whole becomes tough. Can be improved.
- the flexibility of the molded product of the conductive composition can be improved.
- both the cross-linking agent and the plasticizer are contained in the conductive composition.
- the molded product of the conductive composition is imparted with even better toughness.
- the conductive composition may contain a surfactant, a softener, a stabilizer, a leveling agent, an antioxidant, an antioxidant, a leavening agent, a thickener, a colorant, or, if necessary.
- a surfactant include silicone-based surfactants.
- the conductive composition is prepared by mixing each of the above components in the above ratio.
- the conductive composition can appropriately contain a solvent in an arbitrary ratio, if necessary. As a result, an aqueous solution of the conductive composition (an aqueous solution of the conductive composition) is prepared.
- an organic solvent or an aqueous solvent can be used as the solvent.
- the organic solvent include ketones such as acetone and methyl ethyl ketone (MEK); esters such as ethyl acetate; ethers such as propylene glycol monomethyl ether; and amides such as N, N-dimethylformamide.
- the aqueous solvent include water; methanol, ethanol, propanol, alcohol for isopropanol, and the like. Among these, it is preferable to use an aqueous solvent.
- any one or more of the conductive polymer, the binder resin, and the cross-linking agent may be used as an aqueous solution dissolved in a solvent.
- the above-mentioned aqueous solvent is preferable as the solvent.
- the data acquisition device 150 is installed on the upper surface 122 of the base material layer 120 and is electrically connected to the wiring 131.
- the data acquisition device 150 processes the biological signal acquired via the electrode used as the probe 140.
- the data acquisition device 150 has a rectangular shape in a cross-sectional view.
- a terminal is provided on the lower surface (-Z direction) of the data acquisition device 150. Examples of the terminal material include solder and conductive paste.
- the data acquisition device 150 includes an ASIC (application specific integrated circuit) 150A, an MPU (Micro Processing Unit) 150B, a memory 150C, and a wireless communication unit 150TR as an example. It may be included.
- the data acquisition device 150 is connected to the probe 140 and the battery 160 via the circuit unit 130.
- the ASIC150A includes an A / D (Analog to digital) converter as described with reference to FIG.
- the data acquisition device 150 is driven by the electric power supplied from the battery 160 and acquires analog electrocardiographic data measured by the probe 140.
- the data acquisition device 150 performs processing such as filtering and digital conversion on the acquired analog electrocardiographic data.
- the MPU 150B obtains the added average value of the electrocardiographic data acquired and digitally converted a plurality of times and stores it in the memory 150C.
- the data acquisition device 150 can continuously acquire analog electrocardiographic data for 24 hours or more. Since the data acquisition device 150 may measure a biological signal (analog electrocardiographic data) for a long period of time, a device for reducing power consumption is provided as described with reference to FIGS. 1 to 4. ing.
- the wireless communication unit 150TR is a transceiver used when the test device of the evaluation test reads out the digital electrocardiographic data stored in the memory 150C in the evaluation test before the actual sensing by wireless communication, and communicates at 2.4 GHz as an example. I do.
- the evaluation test is, for example, a JIS 60601-2-47 standard test.
- the evaluation test is a test for confirming the operation performed after the completion of the biological sensor 100 that detects a biological signal.
- the evaluation test requires that when the biosensor 100 is used as a medical device, the attenuation rate of the signal output from the biosensor is less than 5% with respect to the biological signal detected by the biosensor 100. This evaluation test is performed on all finished products.
- the start command of the evaluation test, the start command of the actual measurement, etc. are sent via the wireless communication unit 150TR, for example, through the function on the web browser of a smartphone or a PC (Personal Computer) in which the dedicated application program of the biosensor 100 is installed. May be input to the MPU 150B.
- the wireless communication unit 150TR for example, through the function on the web browser of a smartphone or a PC (Personal Computer) in which the dedicated application program of the biosensor 100 is installed. May be input to the MPU 150B.
- the data acquisition device 150 includes the wireless communication unit 150TR
- the data acquisition device 150 includes a connector for connecting the cable of the test device instead of the wireless communication unit 150TR and the biological signal is read through the connector. Good.
- the battery 160 is provided on the upper surface 122 of the base material layer 120.
- a lead storage battery, a lithium ion secondary battery, or the like can be used.
- the battery 160 may be a button battery type.
- the battery 160 is an example of a battery.
- the battery 160 has two terminals (not shown) provided on its lower surface. The two terminals of the battery 160 are connected to the probe 140 and the data acquisition device 150, respectively, via the circuit unit 130.
- the capacity of the battery 160 is set so that the biological sensor 100 can measure a biological signal (analog electrocardiographic data) for 24 hours or more as an example.
- the cover 170 covers the base material layer 120, the circuit unit 130, the substrate 135, the probe 140, the fixing tape 145, the data acquisition device 150, and the battery 160.
- the cover 170 has a base 170A and a protrusion 170B protruding from the center of the base 170A in the + Z direction.
- the base portion 170A is a portion located around the cover 170 in a plan view, and is a portion lower than the protruding portion 170B.
- a recess 170C is provided inside the protrusion 170B (lower side in the stacking direction). In the cover 170, the lower surface of the base 170A is adhered to the upper surface 122 of the base material layer 120.
- the substrate 135, the data acquisition device 150, and the battery 160 are housed in the recess 170C.
- the cover 170 is adhered to the upper surface 122 of the base material layer 120 with the data acquisition device 150, the battery 160, and the like housed in the recess 170C.
- the cover 170 not only protects the circuit unit 130 on the base material layer 120, the data acquisition device 150, and the battery 160, but also protects the internal components from the impact applied to the biosensor 100 from the upper surface side. It has a role as a layer.
- the cover 170 for example, silicone rubber, soft resin, urethane or the like can be used.
- FIG. 7 is a diagram showing a circuit configuration of the biosensor 100.
- Each probe 140 is connected to the data acquisition device 150 and the battery 160 via the wiring 131 and the wiring 135B of the substrate 135.
- the two probes 140 are connected in parallel to the data acquisition device 150 and the battery 160.
- FIG. 8 is a schematic view of the data acquisition device 150 applied to the biosensor 100.
- the detailed configuration and operation of the data acquisition device 150 are as described with reference to FIGS. 1 to 4.
- the ASIC 150A is connected to the pair of probes 140 via the wiring 131 by the pair of terminals 153A.
- the wireless communication unit 150TR is connected to the memory 150C.
- FIG. 9 is a flowchart showing the processing of the MPU 150B when the data acquisition device 150 is applied to the biosensor 100.
- the flowchart of FIG. 9 is a process from the start to the end of the acquisition and recording of electrocardiographic data by the MPU 150B, and is repeatedly executed over a fixed period of time as an example.
- the MPU150B determines whether or not the acquisition of electrocardiographic data has started (step S30). Whether or not the acquisition of the electrocardiographic data has started can be determined by whether or not the analog electrocardiographic data has been input from the probe 140, whether or not the predetermined time has come, and the like. S30 is repeated until the acquisition of electrocardiographic data is started (S30: NO). If the acquisition of electrocardiographic data is started (S30: YES), the switching setting unit 152B sets the switching signal level to "1" and outputs it to the ASIC 150A, and sets the MPU 150B as a slave (step S31). The ASIC150A is set to the master by the switching signal whose level is "1". When the ASIC 150A is set as the master, the ADC 151A causes the ADC 151A to start the digital conversion process.
- the calculation unit 153B takes in digital electrocardiographic data from the ASIC 150A according to the CS signal (step S33).
- the calculation unit 153B performs an addition process according to the equation (2) (step S34).
- the calculation unit 153B determines whether n is 7 or more (step S35). When the calculation unit 153B determines that n is not 7 or more (S35: NO), n is incremented (step S36). Calculation unit 153B is n is 7 or more in the step S5 (S35: YES) and it is determined, the average value of the sum A 8 a (A 8/8) determined (step S37), the average value (A 8/8 ) Is stored in the memory 150C (step S38).
- the main control unit 151B determines whether or not the acquisition of electrocardiographic data has been completed (step S39). Whether or not the acquisition of the electrocardiographic data is completed depends on whether or not the electrocardiographic data has been input from the probe 140 for a certain period of time or more, whether or not a predetermined time has elapsed from the start of the acquisition of the electrocardiographic data, and whether or not the electrocardiographic data of the memory 150C is completed. It can be determined whether or not the occupancy rate of the storage area exceeds a certain level. As an example, the data acquisition device 150 may have a built-in timer, and the main control unit 151B may determine that the acquisition of the electrocardiographic data is completed when 24 hours have elapsed from the start of recording the digital electrocardiographic data.
- the switching setting unit 152B sets the switching signal level to "0" and outputs it to the ASIC 150A.
- MPU150B is set as the master (step S410).
- the ASIC150A is set as a slave by the switching signal whose level is "0".
- the ADC 151A terminates the digital conversion process.
- the ASIC 150A causes the ADC 151A to perform digital conversion processing while the switching signal is at the "1" level, and when the switching signal is switched to the "0" level, the ADC 151A terminates the digital conversion processing. That is, the ADC 151A continues to perform the digital conversion process while the ASIC 150A is the master.
- the total value of the digital electrocardiographic data is obtained over the acquisition period of the electrocardiographic data, the averaging processing is performed, and the data is stored in the memory 150C.
- the biosensor 100 using the data acquisition device 150 has acquired electrocardiographic data xi (i is an integer of 0 to 7) in each of the electrocardiographic data acquisition sections Ti (for example, i is an integer of 0 to 7).
- Biometric sensor 100, MPU150B is determined an addition value A n + 1 shown in FIG. 3 (B), while seeking the average value of the sum A 8 a (A 8/8), set ASIC150A the master, the MPU150B Set to slave. In this state, the frequency of the system clock of the MPU 150B is lowered to 4 MHz, which is equal to the sampling frequency of the ADC 151A. This also makes it possible to reduce power consumption.
- the MPU 150B Since the MPU 150B takes in digital electrocardiographic data from the ASIC 150A when the CS signal transitions to the L level with the self set as a slave, the MPU 150B can output the digital electrocardiographic data even if the MPU 150B does not request the ASIC 150A to transmit the digital electrocardiographic data. Can be obtained. Therefore, the MPU 150B can immediately take in the digital electrocardiographic data acquired from the ADC 151A by the control unit 270, and has good real-time performance. Therefore, it is possible to provide the biosensor 100 having good real-time performance.
- Probe 150 Data acquisition device 150A ASIC 150B MPU 150C memory 150D, 150E bus 151A ADC 151B Main control unit 152B Switching setting unit 153B Calculation unit 154B Memory 160 Battery 300 Sensor
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Abstract
Description
データ取得開始時にマスタ/スレーブを切り替える切替信号が入力される第1端子と、入力されるアナログデータをデジタルデータに変換するA/D変換器と、前記デジタルデータを出力する出力端子とを有し、前記切替信号によってマスタ又はスレーブのいずれかに設定される集積回路と、
前記集積回路がスレーブであるときには自己をマスタに設定し、前記集積回路がマスタであるときには自己をスレーブに設定するともに、前記切替信号を生成する切替設定部と、前記第1端子に接続され前記切替信号を出力する第2端子と、前記出力端子に接続され前記デジタルデータが入力される入力端子とを有する情報処理装置とを含み、
前記集積回路は、前記情報処理装置から入力される前記切替信号によって自己がマスタに設定されているときに、前記デジタルデータを前記出力端子から出力する。
前記被検体からの心電データの取得開始時にマスタ/スレーブを切り替える切替信号が入力される第1端子と、前記電極から入力されるアナログ心電データをデジタル心電データに変換するA/D変換器と、前記デジタル心電データを出力する出力端子とを有し、前記切替信号によってマスタ又はスレーブのいずれかに設定される集積回路と、
前記集積回路がスレーブであるときには自己をマスタに設定し、前記集積回路がマスタであるときには自己をスレーブに設定するとともに、前記切替信号を生成する切替設定部と、前記第1端子に接続され前記切替信号を出力する第2端子と、前記出力端子に接続され前記デジタル心電データが入力される入力端子とを有する情報処理装置とを有し、
前記集積回路は、前記情報処理装置から入力される前記切替信号によって自己がマスタに設定されているときに、前記デジタル心電データを前記出力端子から出力する。
図1は、実施形態のデータ取得装置150を示す図である。データ取得装置150は、センサ300等の任意の機器の端子、電極などに接続されて、目的とするデータを取得する。センサ300は、例えば、心電波形、脳波、脈拍等を表す生体信号を検出するセンサであるが、この例に限定されない。以下では、センサ300が心電波形を表す生体信号(アナログ心電データ)を検出するセンサである形態について説明するが、センサ300は温度、光、圧力、地磁気等、生体信号以外の信号を検出するセンサであってもよい。
データ取得装置150を生体センサ100に適用した構成例を説明する。
140 プローブ
150 データ取得装置
150A ASIC
150B MPU
150C メモリ
150D、150E バス
151A ADC
151B 主制御部
152B 切替設定部
153B 演算部
154B メモリ
160 電池
300 センサ
Claims (14)
- データ取得開始時にマスタ/スレーブを切り替える切替信号が入力される第1端子と、入力されるアナログデータをデジタルデータに変換するA/D変換器と、前記デジタルデータを出力する出力端子とを有し、前記切替信号によってマスタ又はスレーブのいずれかに設定される集積回路と、
前記集積回路がスレーブであるときには自己をマスタに設定し、前記集積回路がマスタであるときには自己をスレーブに設定するともに、前記切替信号を生成する切替設定部と、前記第1端子に接続され前記切替信号を出力する第2端子と、前記出力端子に接続され前記デジタルデータが入力される入力端子とを有する情報処理装置と
を含み、
前記集積回路は、前記情報処理装置から入力される前記切替信号によって自己がマスタに設定されているときに、前記デジタルデータを前記出力端子から出力する、
データ取得装置。 - 前記情報処理装置は、前記データ取得開始時に、前記集積回路をマスタに設定する第1切替信号を生成する、請求項1に記載のデータ取得装置。
- 前記情報処理装置は、データ取得終了時に、マスタ/スレーブを切り替える第2切替信号を生成する、請求項1または2に記載のデータ取得装置。
- 前記情報処理装置は、自己をスレーブに設定しているときには、自己をマスタに設定しているときよりもクロック周波数を低下させる、請求項1乃至3のいずれか一項に記載のデータ取得装置。
- 前記情報処理装置は、
クロックに従って前記デジタルデータを取得する度に、前記デジタルデータを取得する取得区間の終了後に、取得したデジタルデータの加算値を求める加算処理と、
前記加算処理で加算された前記デジタルデータの数が所定数になると、前記所定数分の前記加算値の平均値を求める平均化処理と、
を行う演算部をさらに有する、請求項1乃至4のいずれか一項に記載のデータ取得装置。 - 前記情報処理装置に接続され、前記平均値を格納するメモリをさらに含む、請求項5記載のデータ取得装置。
- 前記集積回路は、SPI(Serial Peripheral Interface)バスで前記情報処理装置に接続される特定用途向け集積回路であり、
前記第1端子、前記出力端子、前記第2端子、及び前記入力端子は、SPIインターフェイスに対応した端子である、請求項1乃至6のいずれか一項記載のデータ取得装置。 - 被検体に接触する電極と、
前記電極を介してアナログ心電データを取得するデータ取得装置と、
前記電極及び前記データ取得装置を接続する配線と
を含み、
前記データ取得装置は、
前記被検体からの心電データの取得開始時にマスタ/スレーブを切り替える切替信号が入力される第1端子と、前記電極から入力されるアナログ心電データをデジタル心電データに変換するA/D変換器と、前記デジタル心電データを出力する出力端子とを有し、前記切替信号によってマスタ又はスレーブのいずれかに設定される集積回路と、
前記集積回路がスレーブであるときには自己をマスタに設定し、前記集積回路がマスタであるときには自己をスレーブに設定するとともに、前記切替信号を生成する切替設定部と、前記第1端子に接続され前記切替信号を出力する第2端子と、前記出力端子に接続され前記デジタル心電データが入力される入力端子とを有する情報処理装置と
を有し、
前記集積回路は、前記情報処理装置から入力される前記切替信号によって自己がマスタに設定されているときに、前記デジタル心電データを前記出力端子から出力する、生体センサ。 - 前記情報処理装置は、前記心電データの取得開始時に、前記集積回路をマスタに設定する第1切替信号を生成する、請求項8に記載の生体センサ。
- 前記情報処理装置は、前記被検体からの前記心電データの取得終了時に、マスタ/スレーブを切り替える第2切替信号を生成する、請求項8または9に記載の生体センサ。
- 前記情報処理装置は、前記心電データの取得開始から24時間経過後に、前記心電データの取得を終了する、請求項10に記載の生体センサ。
- 前記情報処理装置は、自己をスレーブに設定しているときには、自己をマスタに設定しているときよりもクロック周波数を低下させる、請求項8乃至11のいずれか一項に記載の生体センサ。
- 前記情報処理装置は、
クロックに従って前記デジタル心電データを取得する度に、前記デジタル心電データの取得区間の終了後に、取得したデジタル心電データの加算値を求める加算処理と、
前記加算処理で加算された前記デジタル心電データの数が所定数になると、前記所定数分の前記加算値の平均値を求める平均化処理と
を行う演算部をさらに有する、請求項8乃至12のいずれか一項に記載の生体センサ。 - 前記被検体に貼り付けられる貼付面を有する感圧接着層と、
前記感圧接着層の貼付面の反対面に重ねて設けられる基材層と
をさらに含み、
前記電極は前記感圧接着層に固定され、
前記データ取得装置は、前記基材層上に設けられる、請求項8乃至13のいずれか一項記載の生体センサ。
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