CN108888257B - Multi-parameter wearable health detection equipment based on shared electrode - Google Patents
Multi-parameter wearable health detection equipment based on shared electrode Download PDFInfo
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- CN108888257B CN108888257B CN201810403654.7A CN201810403654A CN108888257B CN 108888257 B CN108888257 B CN 108888257B CN 201810403654 A CN201810403654 A CN 201810403654A CN 108888257 B CN108888257 B CN 108888257B
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- 238000001514 detection method Methods 0.000 title claims abstract description 37
- 230000036541 health Effects 0.000 title claims abstract description 19
- 239000011159 matrix material Substances 0.000 claims abstract description 17
- 210000000707 wrist Anatomy 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 12
- 238000002955 isolation Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 238000013461 design Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000002565 electrocardiography Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000008280 blood Substances 0.000 description 2
- 210000004369 blood Anatomy 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 231100000430 skin reaction Toxicity 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000012905 input function Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000001028 reflection method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
-
- 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
- A61B5/6802—Sensor mounted on worn items
Abstract
The invention discloses a multi-parameter wearable health detection device based on a shared electrode, which comprises a device body; the equipment body comprises an electrode, an analog switch matrix, a signal acquisition unit and a processor control unit; the electrodes are respectively connected with the signal input ends of the analog switch matrix; the signal output end of the analog switch matrix is connected with the signal input end of the signal acquisition unit; the signal output end of the signal acquisition unit is connected with the signal input end of the processor control unit; the electrode sharing among various sensors is realized through the various combinations among the four electrodes realized by the analog switch matrix, so that the number of the electrodes used by the device is reduced, the design difficulty of the appearance size of the wearable device is reduced, and the use comfort of a user is improved.
Description
Technical Field
The invention relates to the field of health detection, in particular to a multi-parameter wearable health detection device based on a shared electrode.
Background
Wearable products such as a bracelet and a watch become one of indispensable electronic products in daily life, however, users are no longer satisfied with the requirements of simple step counting and activity, more functions are required to be detected, and intelligent multi-parameter physiological index detection naturally becomes the first choice.
Basic physiological indexes can be divided into three main categories according to detection methods: firstly, detection based on photoelectric absorption and reflection methods, and commonly pulse rate detection (HRM) and blood oxygen saturation (SPO 2) based on a plethysmographic wave (PPG); secondly, based on biopotential detection, common Electrocardiography (ECG), electroencephalogram (EEG) and myoelectricity (EMG); thirdly, impedance-based detection, commonly body composition analysis (BIA) and galvanic skin response (EDA or GSR). The first optical detection method has the advantages that no active participation of people is needed, no sensing detection can be realized, electrodes are needed for detection of two main physiological indexes, and electrodes with good contact are needed, generally, at least 2-3 electrodes are needed for ECG/EEG/EMG, 4 electrodes are needed for BIA, 2 electrodes are needed for EDA, if the functions are simply integrated, the number of required elements is increased, the control difficulty of the appearance size of the product is obviously increased, the product is difficult to be small and portable, and the application of the product to wearable products is limited to a certain extent.
Heart Rate (HRM) or blood oxygen saturation (SPO 2) detection based on optical PPG detection has been configured on the mainstream wristband at present, and few devices also integrate an Electrocardiographic (ECG) function on this basis; these devices typically also require 2 charging terminals/electrodes and 1 touch key, at least 5 terminals/electrodes if the electrodes are not multiplexed, let alone further integrating EDA, BIA, etc. functions. It is necessary to invent a multi-parameter wearable health detection device based on a shared electrode, which realizes the sharing of electrodes by a plurality of sensors, and is safe and portable.
Disclosure of Invention
The invention aims to: in order to overcome the defects in the prior art, the invention provides a safe and portable multi-parameter wearable health detection device based on a shared electrode, which realizes the sharing of electrodes by a plurality of sensors.
The technical scheme is as follows: in order to achieve the above object, the multi-parameter wearable health detection device based on the shared electrode of the present invention comprises a device body; the equipment body comprises an electrode, an analog switch matrix, a signal acquisition unit and a processor control unit; the electrodes are used for respectively connecting different parts of the detected human body with the signal input ends of the analog switch matrix; the signal output end of the analog switch matrix is connected with the signal input end of the signal acquisition unit; the signal output end of the signal acquisition unit is connected with the signal input end of the processor control unit.
Further, an analog input protection unit is connected between the electrode and the analog switch matrix; the analog input protection unit comprises a plurality of device groups; the device groups are respectively and correspondingly arranged on the channels of the electrodes; the device group comprises an isolation capacitor, a first resistor and a second resistor; the isolation capacitor and the first resistor are arranged in series; the second resistor, the isolation capacitor and the first resistor are arranged in parallel.
Further, the signal acquisition unit comprises a skin electric activity acquisition device; the electrode comprises a first electrode and a second electrode; the first electrode and the second electrode are in contact with the skin of the wearing part of the tested person; the first electrode and the second electrode are respectively connected with the signal input end of the skin electric activity acquisition device; the signal output end of the skin electric activity acquisition device is connected with the signal input end of the processor control unit.
Further, the signal acquisition unit comprises a first biopotential acquisition device; the electrodes include a second electrode and a third electrode; the second electrode is in contact with the skin of the wearing part of the tested person; the third electrode is in contact with the skin outside the wearing part of the person to be tested; the second electrode and the third electrode are respectively connected with the signal input end of the first bioelectric potential acquisition device; the signal output end of the first bioelectric potential acquisition device is connected with the signal input end of the processor control unit.
Further, the signal acquisition unit comprises a second biopotential acquisition device; the electrode comprises a first electrode, a second electrode and a third electrode; the first electrode and the second electrode are in contact with the skin of the wearing part of the tested person; the third electrode is in contact with the skin outside the wearing part of the person to be tested; the first electrode, the second electrode and the third electrode are respectively connected with the signal input end of the second biopotential acquisition device; and the signal output end of the second biopotential acquisition device is connected with the signal input end of the processor control unit.
Further, the signal acquisition unit comprises a body composition analysis device; the electrodes comprise a first electrode, a second electrode, a third electrode and a fourth electrode; the first electrode and the second electrode are in contact with the skin of the wearing part of the tested person; the third electrode and the fourth electrode are in contact with the skin outside the wearing part of the person to be tested; the first electrode, the second electrode, the third electrode and the fourth electrode are respectively connected with the signal input end of the body component analysis device; the signal output of the body composition analysis device is connected with the signal input of the processor control unit.
Further, the device body is fixedly arranged on the wrist through a lacing; the electrodes comprise a first electrode, a second electrode, a third electrode and a fourth electrode; the first electrode and the second electrode are arranged on one side of the device body facing the wrist and are in contact with the wrist; the third electrode and the fourth electrode are contacted with other parts of the body of the person to be tested except the wrist.
Further, the electrodes include a first electrode, a second electrode, and a third electrode; the first electrode and the second electrode are in contact with the skin of the wearing part of the tested person; the third electrode is contacted with a part except the wearing part of the person to be tested; a touch control unit is arranged on a connecting line between the third electrode and the biopotential acquisition device; the signal output end of the touch control unit is connected with the signal input end of the processor control unit; an alternative analog switch is arranged between the third electrode and the touch control unit.
Further, the electrode comprises a first electrode and a second electrode; the first electrode and the second electrode are in contact with the skin of the wearing part of the tested person; a power input protection unit is connected between the first electrode, the second electrode and the signal acquisition unit; and the power output end of the power input protection unit is connected with the battery through the battery charging unit.
Further, the power input protection unit comprises a first PMOS tube, a second PMOS tube, a first NMOS tube and a second NMOS tube; a first PMOS tube and a first NMOS tube are sequentially connected between the first electrode and the battery charging unit; a first controller is connected to the first NMOS tube; the first controller adjusts the switch of the first NMOS tube through a control signal; a second PMOS tube and a second NMOS tube are sequentially connected between the second electrode and the battery charging unit; a second controller is connected to the second NMOS tube; the second controller adjusts the switch of the second NMOS tube through a control signal.
The beneficial effects are that: the invention relates to a multi-parameter wearable health detection device based on a shared electrode, which comprises a device body; the equipment body comprises an electrode, an analog switch matrix, a signal acquisition unit and a processor control unit; the electrode sharing among various sensors is realized through the various combinations among the four electrodes realized by the analog switch matrix, so that the number of the electrodes used by the device is reduced, the design difficulty of the appearance size of the wearable device is reduced, and the use comfort of a user is improved.
Drawings
FIG. 1 is a diagram of a design architecture of a detection device;
FIG. 2 is a schematic view of the positions of the electrodes when worn;
fig. 3 is a schematic diagram of a specific structure of the power input protection unit.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
A multi-parameter wearable health detection device based on a shared electrode, as shown in fig. 1, comprises a device body 5; the equipment body 5 comprises electrodes, an analog input protection unit 9, an analog switch matrix 11, a signal acquisition unit 13 and a processor control unit 16; the electrodes are conductive materials exposed on the equipment and are used for analog signal acquisition; the electrodes comprise a first electrode 1, a second electrode 2, a third electrode 3 and a fourth electrode 4; the four electrodes are connected with a signal acquisition unit 13 through an internal analog switch matrix 11 by an analog input protection unit 9; the first electrode 1 and the second electrode 2 are multiplexed to serve as equipment charging terminals besides an analog input function, a power input protection unit 8 is used for isolating a power source from analog input, the power input protection unit 8 is sequentially connected with a battery charging unit 10 and a battery 12, the equipment battery is charged, and the battery charging unit 10 is a charging circuit of the battery 12; the fourth electrode 4 can be multiplexed as touch electrodes at the same time, and the application conditions of the electrodes are shown in table 1.
The power input protection unit 8 isolates a power supply from an analog signal, as shown in fig. 3, a double-MOS tube design is adopted for a channel of each electrode, and the power input protection unit specifically comprises a first PMOS tube Q1, a second PMOS tube Q3, a first NMOS tube Q2 and a second NMOS tube Q4; the first PMOS tube Q1 and the second PMOS tube Q3 are arranged to realize one-way conduction, so that the charging requirement of equipment is met, but current can not be prevented from flowing back to the input end from the charging circuit; the second-stage first NMOS tube Q2 and the second NMOS tube Q4 are added on the basis of the PMOS tube, the first NMOS tube Q2 is connected with a first controller U1, the second NMOS tube Q4 is connected with a second controller U2, when an external power supply is connected, the two NMOS tubes are closed by default, but the two NMOS tubes can be opened by a Control signal EN_control of the first controller U1 and the second controller U2, so that a user is effectively protected; the device can be effectively charged through the power input protection unit 8, and power signals can not flow back to the input end during signal acquisition.
Table 1 electrode combinations in various application scenarios
The function of the analog input protection unit 9 is to isolate the analog signal from other signals; the analog input protection unit 9 comprises a plurality of device groups; the device groups are respectively and correspondingly arranged on the channels of the electrodes; the device group comprises an isolation capacitor Ciso, a first resistor Rin and a second resistor rin_ecg; the isolation capacitor Ciso and the first resistor Rin are connected in series to protect the impedance test channel, the isolation capacitor Ciso plays a role of direct current isolation, the influence of power supply voltage on the acquisition channel can be effectively prevented, and the values of the isolation capacitor Ciso and the first resistor Rin are required to be determined according to an actual circuit and target precision; if the standard of the medical instrument is required to be met, the leakage current requirement in IEC60601-1 is also required to be met; the second resistor rin_ecg is arranged in parallel with the isolation capacitor Ciso and the first resistor Rin, the rin_ecg is an input current limiting resistor for biopotential detection, the value is between 100 and 300K ohms, direct current is not added to block the Ciso_ecg, and the reason that the prepositive capacitor can block direct current but extremely reduces the common mode rejection ratio CMRR of the biopotential detection circuit, so that the detection effect is affected; meanwhile, as can be seen from the first table, the first electrode 1 is used as a reference electrode for biopotential detection, and meanwhile, the positive input end of the device is multiplexed when the device is charged, so that the current limiting resistor of the reference electrode can provide a discharging path for a power supply so as not to cause an overvoltage burning device.
The analog switch matrix 11 is a circuit based on the circuit connection logic of table one, and uses a circuit of analog switches.
The signal acquisition unit 13 includes an analog-to-digital conversion device (ADC) and a digital-to-analog conversion Device (DAC); an analog-to-digital conversion device (ADC) for converting an output voltage of an instrument/differential amplifier (Instrumentation or DifferentialAMP) that collects the biopotential collection device and an output voltage of a current/voltage converter (TIA) for impedance detection into digital signals; a digital-to-analog conversion Device (DAC) generates excitation signals for impedance detection for body composition analysis and galvanic skin response.
The alternative analog switch 14 is used to select whether the third electrode 3 is used for analog data acquisition or touch key function. If the touch key function is selected, a signal will enter the touch control unit 15, generating key information to the processor control unit 16.
The processor control unit 16 is a core control part of the entire system for controlling and processing information of the respective units.
As shown in fig. 2, the device body 5 is fixedly worn on the wrist 6 through a lacing 7; the first electrode 1 and the second electrode 2 are arranged on one side of the device body 5 facing the wrist 6, are attached to the wrist 6, and are contacted with the skin of the corresponding area; the third electrode 3 and the fourth electrode 4 are located on the side of the device body 5 facing away from the wrist 6, and when in use, the other parts of the body (such as the other hand) except the wrist 6 of the person to be tested need to be contacted.
The wearable health detection device can complete the tasks of detecting various vital signs by using 4 electrodes, the number of electrodes used by the device is reduced due to the design of the shared electrodes among various sensors, the design difficulty of the appearance size of the wearable device is reduced, and the use comfort of a user is improved.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (8)
1. Multi-parameter wearable health detection equipment based on shared electrode, its characterized in that: comprises an equipment body (5); the equipment body (5) comprises electrodes, an analog switch matrix (11), a signal acquisition unit (13) and a processor control unit (16); the electrodes are used for respectively connecting different parts of a detected human body with the signal input ends of the analog switch matrix (11); the signal output end of the analog switch matrix (11) is connected with the signal input end of the signal acquisition unit (13); the signal output end of the signal acquisition unit (13) is connected with the signal input end of the processor control unit (16);
an analog input protection unit (9) is connected between the electrode and the analog switch matrix (11); the analog input protection unit (9) comprises a plurality of device groups; the device groups are respectively and correspondingly arranged on the channels of the electrodes; the device group comprises an isolation capacitor, a first resistor and a second resistor; the isolation capacitor and the first resistor are arranged in series; the second resistor is connected with the isolation capacitor and the first resistor in parallel;
the signal acquisition unit (13) comprises a second biopotential acquisition device; the electrode comprises a first electrode (1);
the first electrode (1) is used as a reference electrode of the second biopotential acquisition device, and is simultaneously multiplexed as a positive input end when the equipment body (5) is charged;
the second resistor is used as an input current limiting resistor of the second biopotential acquisition device;
the electrode further comprises a second electrode (2); the first electrode (1) and the second electrode (2) are in contact with the skin of the wearing part of the tested person; a power input protection unit (8) is connected between the first electrode (1), the second electrode (2) and the signal acquisition unit (13); the power output end of the power input protection unit (8) is connected with a battery (12) through a battery charging unit (10).
2. A multi-parameter wearable health detection device based on a shared electrode as claimed in claim 1, wherein: the electrode further comprises a third electrode (3); the third electrode (3) is contacted with the skin outside the wearing part of the tested person; the first electrode (1), the second electrode (2) and the third electrode (3) are respectively connected with the signal input end of the second biopotential acquisition device; the signal output end of the second biopotential acquisition device is connected with the signal input end of the processor control unit (16).
3. A multi-parameter wearable health detection device based on a shared electrode as claimed in claim 1, wherein: the signal acquisition unit (13) further comprises a skin electric activity acquisition device; the first electrode (1) and the second electrode (2) are respectively connected with the signal input end of the skin electric activity acquisition device; the signal output end of the skin electric activity acquisition device is connected with the signal input end of the processor control unit (16).
4. A multi-parameter wearable health detection device based on a shared electrode as claimed in claim 1, wherein: the signal acquisition unit (13) further comprises a first biopotential acquisition device; the electrode comprises a third electrode (3); the third electrode (3) is contacted with the skin outside the wearing part of the tested person; the second electrode (2) and the third electrode (3) are respectively connected with the signal input end of the first bioelectric potential acquisition device; the signal output end of the first bioelectric potential acquisition device is connected with the signal input end of the processor control unit (16).
5. A multi-parameter wearable health detection device based on a shared electrode as claimed in claim 1, wherein: the signal acquisition unit (13) further comprises body composition analysis means; the electrodes further comprise a third electrode (3) and a fourth electrode (4); the third electrode (3) and the fourth electrode (4) are in contact with the skin outside the wearing part of the person to be tested; the first electrode (1), the second electrode (2), the third electrode (3) and the fourth electrode (4) are respectively connected with a signal input end of the body composition analysis device; the signal output of the body composition analysis device is connected to the signal input of the processor control unit (16).
6. A multi-parameter wearable health detection device based on a shared electrode as claimed in claim 1, wherein: the equipment body (5) is fixedly arranged on the wrist (6) through a lacing (7); the electrodes further comprise a third electrode (3) and a fourth electrode (4); the first electrode (1) and the second electrode (2) are arranged on one side of the device body (5) facing the wrist (6) and are contacted with the wrist (6); the third electrode (3) and the fourth electrode (4) are contacted with other parts of the body of the person to be tested except the wrist (6).
7. A multi-parameter wearable health detection device based on a shared electrode as claimed in claim 1, wherein: the electrode further comprises a third electrode (3); the third electrode (3) is contacted with a part except the wearing part of the person to be tested; a touch control unit (15) is arranged on a connecting line between the third electrode (3) and the second biopotential acquisition device; the signal output end of the touch control unit (15) is connected with the signal input end of the processor control unit (16); an alternative analog switch (14) is arranged between the third electrode (3) and the touch control unit (15).
8. A multi-parameter wearable health detection device based on a shared electrode as claimed in claim 1, wherein: the power input protection unit (8) comprises a first PMOS tube (Q1), a second PMOS tube (Q3), a first NMOS tube (Q2) and a second NMOS tube (Q4); a first PMOS tube (Q1) and a first NMOS tube (Q2) are sequentially connected between the first electrode (1) and the battery charging unit (10); a first controller (U1) is connected to the first NMOS tube (Q2); the first controller (U1) adjusts the switch of the first NMOS tube (Q2) through a control signal; a second PMOS tube (Q3) and a second NMOS tube (Q4) are sequentially connected between the second electrode (2) and the battery charging unit (10); a second controller (U2) is connected and arranged on the second NMOS tube (Q4); the second controller (U2) adjusts the switch of the second NMOS tube (Q4) through a control signal.
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| CN109381180A (en) * | 2018-12-06 | 2019-02-26 | 深圳市优创亿科技有限公司 | Detectable bio-impedance and cardiac electrical wearable device, measuring system and method |
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