CN112617787A - Passive wireless heart rhythm monitoring system based on radio frequency surface acoustic wave sensor - Google Patents
Passive wireless heart rhythm monitoring system based on radio frequency surface acoustic wave sensor Download PDFInfo
- Publication number
- CN112617787A CN112617787A CN202011486051.1A CN202011486051A CN112617787A CN 112617787 A CN112617787 A CN 112617787A CN 202011486051 A CN202011486051 A CN 202011486051A CN 112617787 A CN112617787 A CN 112617787A
- Authority
- CN
- China
- Prior art keywords
- surface acoustic
- acoustic wave
- radio frequency
- wave sensor
- heart rhythm
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02438—Detecting, measuring or recording pulse rate or heart rate with portable devices, e.g. worn by the patient
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0002—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network
- A61B5/0015—Remote monitoring of patients using telemetry, e.g. transmission of vital signals via a communication network characterised by features of the telemetry system
-
- 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
Abstract
The invention relates to a passive wireless heart rhythm monitoring system based on a radio frequency surface acoustic wave sensor, which comprises: the device comprises an interrogator (1), a radio frequency surface acoustic wave sensor (2), an air bag (3), a magic tape (4) and a man-machine interaction module (5); the interrogator generates a high-frequency signal to excite the surface acoustic wave sensor, the surface acoustic wave pressure sensor is arranged in the air bag, and the air bag is tied to the chest through the thread gluing belt; when a user inquires heart rhythm information through software, the interrogator generates a high-frequency adjustable signal, receives a radio-frequency signal of the acoustic radio-frequency surface acoustic wave sensor, determines the resonant frequency of the acoustic radio-frequency surface acoustic wave sensor according to the strength of the radio-frequency signal under different frequencies, determines the heart rhythm of a node to be tested according to the relation between the resonant frequency and the heart rhythm, and transmits the heart rhythm information to the user through the man-machine interaction module. The wireless power supply has the advantages of higher precision, lower power consumption, capability of working under the passive and wireless condition, small volume and convenience for wearing by users.
Description
Technical Field
The invention provides a passive wireless heart rhythm monitoring system based on a radio frequency surface acoustic wave sensor, in particular to a passive wireless heart rhythm monitoring system comprising an air bag, a surface acoustic wave sensor, a detection circuit and a matched man-machine interaction module, and belongs to the technical field of micro-electro-mechanical systems (MEMS).
Background
Nowadays, people pay more and more attention to health problems, and the demand of consumers on rhythm measurement is more and more common. Along with intelligence dress deepens people's life gradually, more and more intelligent wearing equipment has possessed the function of monitoring rhythm of the heart. However, how to achieve miniaturization and low power consumption of heart rhythm monitoring is a concern. Although the intelligent wearable device provides a convenient way for obtaining heart rhythm information for users, the accuracy of heart rhythm monitoring is not high, and the requirements of vast users cannot be met. The existing methods for measuring the heart rhythm mainly comprise the following three methods:
(1) photoelectric volume measuring method
The principle of the photoplethysmography is that after green emission light is absorbed, scattered and reflected by skin tissues and blood, the light intensity shows regular changes. The sports bracelet applies the method, but the defects are that the precision is not high, and the wearing position cannot be shielded.
(2) LC resonant sensor mutual inductance coupling
The mutual inductance coupling principle of the LC resonance sensor is that an electric signal generated by the heartbeat gradually diffuses to the body surface, and the heart rhythm information can be obtained on the skin surface through LC resonance measurement. This method is used for electrocardiography in hospitals. The disadvantage is that the current is still powered by the mutual inductance coil, and the measuring distance is short.
(3) Arterial pressure detection method
The artery pressure detection method is accurate in detecting the artery through the pressure detection device. The defect is that the long-term wearing can compress the artery, which causes discomfort for the wearer, and the device is not fixed on the surface of the skin in a proper way and is not easy to carry.
However, the rf saw sensor has advantages of high precision, small size, low power consumption, etc., and can work under passive and wireless conditions. Therefore, compared with the prior art, the passive wireless heart rhythm monitoring system based on the radio frequency surface acoustic wave sensor has higher precision and smaller volume, can be conveniently worn by a user, can work under the passive wireless condition, and can better meet the requirements of the user.
Disclosure of Invention
The technical problem is as follows: in order to overcome the defects of low precision, large power consumption, short transmission distance and inconvenience in use of users of the existing measuring method, the invention provides a passive wireless heart rhythm monitoring system based on a radio frequency surface acoustic wave sensor. Compared with the prior art, the passive wireless heart rhythm monitoring system based on the radio frequency surface acoustic wave sensor has the advantages of higher precision, lower power consumption, capability of working under the passive wireless condition, small volume and convenience for a user to wear.
The technical scheme is as follows: the invention provides a passive wireless heart rhythm monitoring system based on a radio frequency surface acoustic wave sensor, which relates to the design of a passive wireless module, the radio frequency surface acoustic wave sensor, a modulation and demodulation circuit and the like, researches the working principle and the measurement process suitable for heart rhythm monitoring, provides corresponding App development, and is convenient for a user to inquire heart rhythm information in real time.
The invention discloses a passive wireless heart rhythm monitoring system based on a radio frequency surface acoustic wave sensor, which comprises: the system comprises an interrogator, a radio frequency surface acoustic wave sensor, an air bag, a sticky buckle and a human-computer interaction module; the interrogator generates a high-frequency signal to excite the surface acoustic wave sensor, the surface acoustic wave pressure sensor is arranged in the air bag, the air bag is tied to the chest through the sticky buckle, an antenna in the radio frequency surface acoustic wave sensor receives an external inquiry signal, the external inquiry signal is converted into a surface acoustic wave signal through an interdigital transducer on the radio frequency surface acoustic wave sensor, due to the existence of the reflecting grating, the surface acoustic wave forms standing waves with specific resonant frequency between a left reflecting grating (2) and a right reflecting grating (2-2) after being reflected, and then the standing waves are converted into electric signals through the; and the man-machine interaction module feeds back the heart rhythm information to the user.
The radio frequency surface acoustic wave sensor comprises a microstrip antenna, an interdigital transducer, a reflecting grating and a radio frequency surface acoustic wave sensor radio frequency antenna; the microstrip antenna is connected with the interdigital transducer, the left side and the right side of the interdigital transducer are respectively provided with a reflecting grating, and the radio frequency antenna of the radio frequency surface acoustic wave sensor is connected with the interdigital transducer.
The interrogator comprises an MCU core board, a DDS generator, a PLL frequency synthesizer, a band-pass filter, a power amplifier, a radio frequency receiving and transmitting switch, a band-pass filter, a low noise amplifier, an envelope detector and an A/D sampler which are sequentially connected, wherein the output end of the A/D sampler is connected with the MCU core board, and data are sent to the MCU core board for analysis; the interrogator radio frequency antenna and the MCU core board are connected with the radio frequency receiving and transmitting switch in a distributed mode.
The invention places the radio frequency surface acoustic wave sensor on the air bag, the antenna in the surface acoustic wave sensor receives the external inquiry signal, and the external inquiry signal is converted into the surface acoustic wave signal through the interdigital transducer, because of the existence of the reflector, the surface acoustic wave forms the standing wave with specific resonant frequency on the piezoelectric substrate after being reflected, and then the standing wave is returned after being converted into the electric signal by the interdigital transducer. Once the heart beats, the air pressure of the air bag changes, the pressure borne by the piezoelectric substrate of the sensor changes, and therefore the wave speed of the surface acoustic wave changes, and the resonant frequency of the sensor changes. Usually, the variation has a linear relationship, and the pressure caused by the beating of the heart can be measured by detecting the resonant frequency. During actual work, the interrogator sends signals, receives and processes information sent back by the sensor, and finally feeds back the information to a user. The interrogator has the functions of exciting the sensor to generate a high-frequency adjustable signal, receiving a radio-frequency signal of the sensor, determining the resonant frequency of the sensor, and determining the heart rhythm condition of a measured point according to the relation between the measured resonant frequency and the pressure.
Has the advantages that: compared with the existing heart rhythm measuring method, the passive wireless heart rhythm monitoring system based on the radio frequency surface acoustic wave sensor has the remarkable advantages that:
1. the invention adopts the radio frequency surface acoustic wave sensor based on the MEMS technology, the sensor can convert the electric signal received by the antenna into mechanical energy, no extra power supply is needed, and a self-energy supply mode is provided, thereby being beneficial to improving the detection precision, reducing the system power consumption and prolonging the working time; in addition, compared with the mutual inductance coupling method of the LC resonance sensor, the wireless transmission distance of the invention is longer and can reach 10 meters, thereby facilitating the real-time inquiry of the heart rhythm information by a user.
2. The detection circuit system provided by the invention adopts the DDS + PLL technology to generate high-frequency signals, is low in development difficulty and research and development cost, and has the advantage of commercialization.
3. The novel wearable medical device has the advantages that the structure of the air bag and the fastening tape is adopted, the size is small, the weight is light, the artery of a user cannot be pressed, the device is convenient for the user to wear for a long time, and the wearable medical device has great improvement and application in the aspect of wearability.
Drawings
FIG. 1 is a block diagram of a passive wireless heart rhythm monitoring system based on RF SAW sensors;
FIG. 2 is a detection schematic block diagram of a passive wireless heart rhythm monitoring system based on a radio frequency surface acoustic wave sensor;
the figure includes: the system comprises an interrogator 1, a radio frequency surface acoustic wave sensor 2, an air bag 3, a magic tape 4 and a human-computer interaction module 5; the interrogator 1 comprises: the device comprises an MCU core board 1-1, a DDS generator 1-2, a PLL frequency synthesizer 1-3, a band-pass filter 1-4, a power amplifier 1-5, a radio frequency transceiving switch 1-6, an interrogator radio frequency antenna 1-7, a band-pass filter 1-8, a low noise amplifier 1-9, an envelope detector 1-10 and an A/D sampler 1-11; the surface acoustic wave pressure sensor 2 includes: 2-1 of an interdigital transducer, 2-2 of a reflecting grating, 2-3 of a piezoelectric substrate and 2-4 of a radio frequency acoustic surface wave sensor radio frequency antenna.
Detailed Description
The specific implementation scheme of the passive wireless heart rhythm monitoring system based on the radio frequency surface acoustic wave sensor is as follows:
the passive wireless heart rhythm monitoring system comprises: the system comprises an interrogator 1, a radio frequency surface acoustic wave sensor 2, an air bag 3, a magic tape 4 and a human-computer interaction module 5; the interrogator 1 generates a high-frequency signal to excite the surface acoustic wave sensor 2, the surface acoustic wave pressure sensor 2 is arranged in the air bag 3, the air bag 3 is tied to the chest through the sticky buckle 4, an antenna in the radio frequency surface acoustic wave sensor 2 receives an external inquiry signal, the external inquiry signal is converted into a surface acoustic wave signal through an interdigital transducer on the radio frequency surface acoustic wave sensor 2, due to the existence of the reflecting grids 2-3, standing waves with specific resonant frequency are formed between the left reflecting grid 2 and the right reflecting grid 2-2 after the surface acoustic wave is reflected, and then the standing waves are converted into electric signals through the interdigital transducer and; the human-computer interaction module 5 feeds back the heart rhythm information to the user.
The radio frequency surface acoustic wave sensor 2 comprises a microstrip antenna 2-1, an interdigital transducer 2-2, a reflecting grating 2-3 and a radio frequency surface acoustic wave sensor radio frequency antenna 2-4; the microstrip antenna 2-1 is connected with the interdigital transducer 2-2, the left side and the right side of the interdigital transducer 2-2 are respectively provided with a reflecting grating 2-3, and the radio frequency antenna 2-4 of the radio frequency surface acoustic wave sensor is connected with the interdigital transducer 2-2.
The interrogator 1 comprises an MCU core board 1-1, a DDS generator 1-2, a PLL frequency synthesizer 1-3, a band-pass filter 1-4, a power amplifier 1-5, a radio frequency transceiving switch 1-6, a band-pass filter 1-8, a low noise amplifier 1-9, an envelope detector 1-10 and an A/D sampler 1-11 which are connected in sequence, wherein the output end of the A/D sampler 1-11 is connected with the MCU core board 1-1, and data are sent to the MCU core board 1-1 for analysis; the interrogator radio frequency antenna 1-7 and the MCU core board 1-1 are connected with a radio frequency receiving and transmitting switch 1-6 in a distributed mode.
The invention relates to a passive wireless heart rhythm monitoring system based on a radio frequency surface acoustic wave sensor, which comprises 5 modules: the device comprises an interrogator 1, a radio frequency surface acoustic wave sensor 2, an air bag 3, a magic tape 4 and a man-machine interaction module 5. The interrogator 1 is used to generate a high frequency adjustable signal and determine the heart rate information. The radio frequency surface acoustic wave sensor 2 is arranged in the air bag 3 and is tied to the chest of a user through a sticky buckle 4. When the heart beats, the air pressure in the air bag 3 changes, and the resonant frequency of the radio frequency surface acoustic wave sensor 2 changes. The human-computer interaction module 5 is used to communicate heart rate information to the user. The specific working process is as follows: when a user inquires heart rhythm information through software, the interrogator 1 generates a high-frequency adjustable signal, receives a radio-frequency signal of the radio-frequency surface acoustic wave sensor 2, determines the resonant frequency of the radio-frequency surface acoustic wave sensor 2 according to the strength of the radio-frequency signal under different frequencies, determines the heart rhythm of a node to be detected according to the relation between the resonant frequency and the heart rhythm, and transmits the heart rhythm information to the user through the man-machine interaction module 5.
The detection circuit of the interrogator 1 is divided into a transmission period and an acceptance period according to the operation state. In a transmitting period, a radio frequency receiving and transmitting switch 1-6 is connected with a transmitting end, an MCU core board 1-1 controls a DDS generator 1-2 to generate an intermediate frequency signal, a PPL frequency synthesizer 1-3 multiplies the intermediate frequency signal into a required high frequency signal, and the high frequency signal is amplified by a band-pass filter 1-4 and a power amplifier 1-5 and then radiated by a radio frequency antenna 1-7; in a receiving period (namely immediately after a transmitting period), the radio frequency transceiving switches 1-6 are converted to a receiving end, a radio frequency signal of the radio frequency surface acoustic wave sensor 2 starts to be received, the radio frequency signal is changed into a low-frequency envelope signal through the band-pass filters 1-8, the low-noise amplifiers 1-9 and the envelope detectors 1-10, finally voltage sampling is carried out through the A/D samplers 1-11, and data are sent to the MCU core board 1-1 for analysis.
The radio frequency surface acoustic wave sensor 2 comprises an interdigital transducer 2-1, a reflecting grating 2-2, a piezoelectric substrate 2-3 and a radio frequency antenna 2-4 of the radio frequency surface acoustic wave sensor. When an external high-frequency excitation signal is received by a radio-frequency surface acoustic wave sensor radio-frequency antenna 2-4, the interdigital transducer 2-1 converts the external high-frequency excitation signal into a surface acoustic wave, the surface acoustic wave continuously propagates along the piezoelectric substrate 2-3, standing waves are formed between the left reflecting grating 2 and the right reflecting grating 2-2 after being reflected by the reflecting gratings 2-2, and a resonant cavity is formed between the reflecting gratings 2-2. When the external high-frequency excitation signal stops, the surface acoustic wave in the resonant cavity is converted into an electric signal by the interdigital transducer 2-1, and finally the radio-frequency signal is emitted through the radio-frequency antenna 2-4 of the radio-frequency surface acoustic wave sensor. When the frequency of the external high-frequency excitation signal is consistent with the resonant frequency of the resonant cavity of the sensor, resonance occurs in the resonant cavity, and the radio-frequency signal radiated by the radio-frequency antenna 2-4 of the radio-frequency surface acoustic wave sensor is strongest. Meanwhile, the resonant frequency of the resonant cavity and the pressure present a linear relationship, so the heart rhythm condition of the monitoring node can be obtained by detecting the radio frequency signal through the interrogator 1.
Claims (3)
1. A passive wireless heart rhythm monitoring system based on a radio frequency surface acoustic wave sensor is characterized by comprising: the device comprises an interrogator (1), a radio frequency surface acoustic wave sensor (2), an air bag (3), a magic tape (4) and a man-machine interaction module (5); the interrogator (1) generates high-frequency signals to excite the surface acoustic wave sensor (2), the surface acoustic wave pressure sensor (2) is arranged in the air bag (3), the air bag (3) is tied to the chest through the fastening tape (4), an antenna in the radio frequency surface acoustic wave sensor (2) receives external inquiry signals, the external inquiry signals are converted into surface acoustic wave signals through an interdigital transducer on the radio frequency surface acoustic wave sensor (2), and due to the existence of the reflecting grids (2-2), standing waves with specific resonant frequency are formed between the left reflecting grid and the right reflecting grid (2-2) after the surface acoustic waves are reflected, and then the standing waves are converted into electric signals through the interdigital transducer and then returned; the man-machine interaction module (5) feeds the heart rhythm information back to the user.
2. The passive wireless heart rhythm monitoring system based on the radio frequency surface acoustic wave sensor is characterized in that the radio frequency surface acoustic wave sensor (2) comprises an interdigital transducer (2-1), a reflecting grating (2-2), a piezoelectric substrate (2-3), a radio frequency surface acoustic wave sensor radio frequency antenna (2-4); interdigital transducer (2-1) be connected with reflection bars (2-2), interdigital transducer (2-1) the side of controlling be equipped with reflection bars (2-2) respectively, radio frequency surface acoustic wave sensor radio frequency antenna (2-4) meet interdigital transducer (2-1).
3. The passive wireless heart rhythm monitoring system based on the radio frequency surface acoustic wave sensor is characterized in that the interrogator (1) comprises an MCU core board (1-1), a DDS generator (1-2), a PLL frequency synthesizer (1-3), a band-pass filter (1-4), a power amplifier (1-5), a radio frequency transceiver switch (1-6), a band-pass filter (1-8), a low noise amplifier (1-9), an envelope detector (1-10) and an A/D sampler (1-11) which are connected in sequence, the output end of the A/D sampler (1-11) is connected with the MCU core board (1-1), and data are sent to the MCU core board (1-1) for analysis; the interrogator radio frequency antenna (1-7) and the MCU core board (1-1) are connected with the radio frequency receiving and transmitting switch (1-6) in a distributed way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011486051.1A CN112617787A (en) | 2020-12-16 | 2020-12-16 | Passive wireless heart rhythm monitoring system based on radio frequency surface acoustic wave sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011486051.1A CN112617787A (en) | 2020-12-16 | 2020-12-16 | Passive wireless heart rhythm monitoring system based on radio frequency surface acoustic wave sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112617787A true CN112617787A (en) | 2021-04-09 |
Family
ID=75313827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011486051.1A Pending CN112617787A (en) | 2020-12-16 | 2020-12-16 | Passive wireless heart rhythm monitoring system based on radio frequency surface acoustic wave sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112617787A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877064A (en) * | 2021-09-29 | 2022-01-04 | 南方科技大学 | Passive radio frequency therapy equipment, radio frequency therapy system and control method and device thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990625A (en) * | 2015-06-18 | 2015-10-21 | 电子科技大学 | Wireless test circuit of resonant type surface acoustic wave sensor and test method |
| CN105157870A (en) * | 2015-07-24 | 2015-12-16 | 南京理工大学 | Online temperature measurement system based on passive wireless sound surface wave sensors |
| CN107041751A (en) * | 2017-04-01 | 2017-08-15 | 浙江大学 | A kind of surface acoustic wave sensor of breathing state detecting system and wireless and passive |
| CN108344800A (en) * | 2018-01-17 | 2018-07-31 | 浙江大学 | System for detecting temperature based on wireless passive sonic surface wave sensor and receive-transmit system |
| CN110200447A (en) * | 2019-05-29 | 2019-09-06 | 上海工程技术大学 | A kind of crib mattress and its control method with heart rate breathing detection |
-
2020
- 2020-12-16 CN CN202011486051.1A patent/CN112617787A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990625A (en) * | 2015-06-18 | 2015-10-21 | 电子科技大学 | Wireless test circuit of resonant type surface acoustic wave sensor and test method |
| CN105157870A (en) * | 2015-07-24 | 2015-12-16 | 南京理工大学 | Online temperature measurement system based on passive wireless sound surface wave sensors |
| CN107041751A (en) * | 2017-04-01 | 2017-08-15 | 浙江大学 | A kind of surface acoustic wave sensor of breathing state detecting system and wireless and passive |
| CN108344800A (en) * | 2018-01-17 | 2018-07-31 | 浙江大学 | System for detecting temperature based on wireless passive sonic surface wave sensor and receive-transmit system |
| CN110200447A (en) * | 2019-05-29 | 2019-09-06 | 上海工程技术大学 | A kind of crib mattress and its control method with heart rate breathing detection |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877064A (en) * | 2021-09-29 | 2022-01-04 | 南方科技大学 | Passive radio frequency therapy equipment, radio frequency therapy system and control method and device thereof |
| CN113877064B (en) * | 2021-09-29 | 2024-02-06 | 南方科技大学 | Passive radio frequency treatment equipment, radio frequency treatment system, control method and device thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Li et al. | Robust overnight monitoring of human vital signs by a non-contact respiration and heartbeat detector | |
| CN106388809A (en) | Smart watch for electrocardiograph detection | |
| CN104622445A (en) | Wireless intelligent multi-physiological-parameter health supervision wrist type equipment | |
| EP1803396B1 (en) | Monitoring apparatus for physical movements of a body organ and method for the same | |
| CN106264504A (en) | Noninvasive Blood Pressure Measurement System based on finger arteriogram and method | |
| CN101966079A (en) | Wireless infrared vital sign sensor | |
| WO2007033270A2 (en) | Device and method for a noninvasive cardiac monitor | |
| CN112617787A (en) | Passive wireless heart rhythm monitoring system based on radio frequency surface acoustic wave sensor | |
| US20060094937A1 (en) | Monitoring apparatus of arterial pulses and method for the same | |
| CN108065940A (en) | Continuous blood oxygen saturation rhythm of the heart ring with alarm | |
| CN111513752B (en) | Pulse diagnosis instrument based on pulse sound signals | |
| CN109009011A (en) | A kind of contactless pulse measurement device | |
| CN209360675U (en) | Wristwatch type blood pressure monitoring device based on pulse wave velocity method | |
| CN201861625U (en) | Wireless infrared vital sign sensor | |
| CN110251108A (en) | Blood pressure measuring device based on electrocardio and pulse wave acoustic signals | |
| CN208927014U (en) | Doppler blood flow survey meter applied to external chest compression | |
| CN209004046U (en) | A kind of cerebral-vessel imaging monitor | |
| CN100508876C (en) | Wrist watch for detecting human body physiological state | |
| CN210493476U (en) | Baby mattress with heart rate respiration detection function | |
| CN210249824U (en) | Heart rate paste and heart rate monitor | |
| CN211131157U (en) | Ultrasonic probe for simultaneously acquiring fetal heart rate and maternal heart rate | |
| CN106214141A (en) | A kind of wireless heart rate measurement apparatus based on photoplethymograph and measuring method | |
| CN100353914C (en) | Important information measuring devices | |
| CN209032337U (en) | A kind of blood pressure monitoring device based on smart machine and wearable bracelet | |
| CN219516267U (en) | Millimeter wave radar vital sign detection system based on medical protective clothing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210409 |