CN105962909A - Wearable child febrile convulsion monitoring device - Google Patents

Abstract

A wearable child febrile convulsion monitoring device, including a belt, a body temperature measurement unit, a state measurement unit and an information processing unit, the belt is configured to be fixed with the subject to be monitored, and is used to connect the body temperature measurement unit and the state measurement unit in series and an information processing unit; the body temperature measurement unit includes a body temperature measurement sensor for measuring the body temperature of the object to be monitored; the state measurement unit includes at least one measurement module for measuring the ambient temperature of the object to be monitored, the surrounding humidity of the object to be monitored and the motion state of the object to be monitored ; The information processing unit is electrically connected with the body temperature measurement unit and the state measurement unit, and is used to process the state parameters measured by the body temperature and state measurement units. The device of the present invention can monitor the body temperature in real time to check whether the child has convulsions under high temperature, etc., allowing parents to manage the growth of the child more conveniently and intelligently.

Description

A wearable monitoring device for febrile seizures in children

technical field

The invention relates to the technical field of biomedical detection, and further relates to a monitoring device for children with febrile convulsions and convulsions.

Background technique

According to relevant data in the 2015 "China Demographic Yearbook", there are more than 25 million newborns in China, and more than 45 million infants and young children aged 8 to 36 months. The healthy growth of children is the top priority of parents, and it is also a very cumbersome thing. Children's physical condition is getting more and more attention. Because children cannot take the initiative to pay attention to their own physical conditions, and promptly report physical discomfort and emergencies to their parents, it is easy to cause unnecessary troubles. For example, febrile convulsion in children is one of the common emergencies in pediatrics. It is more common in children aged 6 months to 6 years, especially in children under 3 years old. The incidence rate is 3% to 4%, and the recurrence rate is 30% to 40%. Febrile convulsions in children are mainly caused by upper respiratory tract infection, accounting for about 30% of convulsions in children. It often occurs when the body temperature rises sharply at the beginning of the disease, and the body temperature often reaches above 39-40°C. The higher the body temperature, the more chances of convulsions. Febrile convulsions in children may lead to serious consequences such as brain damage and mental retardation. Therefore, timely detection and active measures are very important to protect children's health.

In the prior art, although there are various devices for measuring body temperature, measuring humidity, or observing babies by video, they often cannot detect the physical condition of children in time. Situations such as convulsions cannot be detected in time.

Contents of the invention

In view of this, the object of the present invention is to provide a child febrile convulsion monitoring device to realize real-time monitoring of at least one of information such as the child's body temperature, humidity, and action status.

In order to achieve the above object, the present invention provides a wearable child febrile convulsion monitoring device, including a belt, a body temperature measurement unit, a state measurement unit and an information processing unit, characterized in that:

The belt is configured to be fixed with the subject to be monitored, and is used to connect the body temperature measurement unit, the state measurement unit and the information processing unit in series;

The body temperature measurement unit includes a body temperature measurement sensor for measuring the body temperature of the object to be monitored;

The state measurement unit includes at least one measurement module, which is used to measure the temperature around the object to be monitored, the humidity around the object to be monitored, and the motion state of the object to be monitored;

The information processing unit is electrically connected with the body temperature measurement unit and the state measurement unit, and is used for processing the state parameters measured by the body temperature and state measurement units.

Preferably, the monitor also includes a PCBA board housing, the state measurement unit and the information processing unit are arranged on a PCBA board, the PCBA board is arranged inside the PCBA board housing, and the PCBA board housing is sleeved on on the harness.

Preferably, the body temperature measurement unit further includes a body temperature measurement probe and a body temperature measurement housing, the body temperature measurement probe is used to contact the subject to be monitored for contact body temperature measurement, the body temperature measurement probe is at least partly located outside the body temperature measurement housing, at The part inside the body temperature measurement shell is connected with the body temperature measurement sensor.

Preferably, the body temperature measuring probe is a thermistor, and the area where the thermistor is located outside the measurement housing is coated with an insulating material.

Preferably, the body temperature measurement housing is in the shape of an elliptical cylinder, made of silica gel, and is sleeved on the belt. The belt is straddled over the shoulders and armpits of the child during use, and the length can be adjusted according to the condition of the subject to be monitored.

Preferably, the processing steps of the information processing unit include judging whether the body temperature exceeds the body temperature threshold, judging whether the acceleration exceeds the acceleration threshold, and judging whether there is convulsion.

Preferably, the processing step of the information processing unit includes judging whether the ambient temperature of the subject to be monitored and the body temperature of the subject to be monitored exceed a temperature difference threshold and judging whether to kick the quilt.

Preferably, the processing step of the information processing unit includes judging whether the surrounding humidity of the subject to be monitored exceeds a humidity threshold and judging whether the bed is wetted.

Preferably, the information processing unit further includes a Bluetooth communication module, and the Bluetooth communication module is used to transmit the result processed by the information processing unit to an external device via Bluetooth.

Through the above technical solutions, it can be seen that the beneficial effects of the wearable children's febrile convulsions and convulsions monitoring device of the present invention are:

(1) Through real-time monitoring of children's body temperature, humidity, action status and other information, the monitoring device can monitor body temperature in real time, determine whether the child wets the bed, whether the quilt is kicked off, whether the child has convulsions under high temperature, etc., and can communicate with the mobile phone client in real time Bluetooth communication, which transmits children's information such as body temperature, bedwetting, kicking, convulsions, etc. to the mobile client, so that the mobile client can monitor and alarm, and it is convenient for parents to manage the growth of children more intelligently in a timely manner;

(2) Measure the body temperature in advance through the instrument, and distinguish the normal movement and the twitching movement of the child through the algorithm, so that you can know and take measures in advance;

(3) The use of child monitors improves the freedom and flexibility of parents' lives. Parents and guardians no longer need to guard babies and children to understand their current physiological status, and when abnormal conditions occur It can be detected and dealt with immediately.

Description of drawings

1A-1C are respectively the front view, side view and top view of a child monitor of the present invention.

Fig. 2 is a block diagram of a circuit principle of a child monitor according to an embodiment of the present invention.

Fig. 3 is a data legend of the three-axis acceleration value obtained by shaking the human body in the embodiment of the present invention.

Fig. 4 is a flow chart of the sampling period of the high temperature convulsion discrimination algorithm of the present invention.

Fig. 5 is a flow chart of the monitoring cycle of the high temperature convulsion discrimination algorithm of the present invention.

detailed description

In order for researchers in the technical field to better understand the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. Obviously, the described examples are only some examples of the present invention, not all examples.

Referring to Fig. 1A-1C, a wearable child febrile convulsion convulsion monitoring device according to an embodiment of the present invention can monitor children's body temperature, humidity, action status and other information in real time, including belt 101, body temperature measurement probe 102, integration status The PCBA board of the measurement unit and the information processing unit.

Specifically, the belt 101 can be made of medical cloth, can be straddled over the shoulders and armpits of the child, and the length can be adjusted according to the baby's own condition. The belt 101 is configured to be fixed with the object to be monitored (such as a child), and is used to connect the body temperature measurement unit, the state measurement unit and the information processing unit in series;

The outside of the PCBA board has a PCBA board shell 103, which accommodates the PCBA inside the shell, and the shell is sleeved on the strap 101; the shape of the shell with the PCBA is cuboid, and the edges are chamfered, and the material For ABS, the sleeve clips to the drawstring. The PCBA circuit is capable of measuring temperature, humidity, and motion status. Based on these measurement results, it can monitor body temperature in real time, determine whether the child wets the bed, whether the quilt is kicked off, whether the child has convulsions under high temperature, and other physiological states, and can communicate with the mobile phone client in real time. for Bluetooth communication.

Wherein, the information processing unit further includes a Bluetooth communication module, and the Bluetooth communication module is used to transmit the result processed by the information processing unit to an external device through Bluetooth. The body temperature measurement unit 102 has a built-in body temperature measurement sensor and is electrically connected to the information processing unit of the PCBA board. An optional way is that the body temperature measurement unit 102 is bonded to the belt 101 . The body temperature measurement unit also includes a body temperature measurement probe and a body temperature measurement housing, the body temperature measurement probe is used to contact the subject to be monitored for contact body temperature measurement, the body temperature measurement probe is at least partly located outside the body temperature measurement housing The inner part is connected with the body temperature measurement sensor.

The thermistor 104 that described body temperature measuring probe adopts, is coated with insulating material on the thermistor; temperature.

The body temperature measurement shell of the body temperature measurement unit 102 adopts an elliptical cylindrical design, and the material is silica gel which is harmless to the human body, and the electrical connection between the body temperature sensor and the PCBA board is inside the cylindrical silica gel. The thermistor 104 is embedded in the elliptical cylindrical silicone probe, and only the measuring head is exposed to touch the skin for temperature measurement. Referring to Fig. 2, in a specific application embodiment, the PCBA circuit module includes a body temperature thermistor measurement circuit 201, a temperature and humidity measurement circuit 202, an acceleration sensor measurement circuit 203, an MCU circuit 204 with a Bluetooth function, a button A battery 205 and a reference regulated power supply circuit 206.

Specifically, the thermistor used in the body temperature thermistor measuring circuit 201 can be Nanjing Huaju's thermistor model MF54-503E39501830 for measuring the body surface temperature of children. The nominal resistance value of the thermistor is 50K, the B value is 3950, and the accuracy of the B value is ±0.5%. Typically, the temperature measurement accuracy of the thermistor at 30 ohms is less than ±0.012 degrees when the temperature measurement accuracy is 37 degrees. In practical applications, you can choose a more accurate and more suitable body temperature thermistor according to requirements.

The temperature and humidity measurement sensor used by the temperature and humidity measurement circuit 202 can be Sensirion high-precision temperature and humidity SHT25, which is used to measure the temperature and humidity near the child's body, and to determine whether the child has kicked the quilt and wetted the bed. SHT25 is the smallest temperature and humidity digital sensor in the world. Its measuring humidity range is 0 to 100%, temperature range is -40 degrees to 125 degrees, the humidity accuracy can reach 1.8%, and the temperature accuracy can reach 0.2 degrees. It adopts I2C digital output interface, the power consumption is 1.5uw (8-bit measurement, 1 time/second), and the humidity response time is 8s. In a specific application, judging children's bedwetting is based on the detection of humidity greater than a certain set value (humidity threshold), then it is judged as children's bedwetting; kicking is based on whether the quilt is covered or not, which affects the ambient temperature around the device under test. Judgment (whether the difference between body temperature and ambient temperature exceeds the humidity threshold).

The sensor used in the acceleration sensor measurement circuit 203 is a 6-axis motion processing unit MPU6050 from InvenSense Company. The MPU6050 is the world's first integrated 6-axis motion processing device, which integrates a 3-axis gyroscope, a 3-axis accelerometer, and includes digital motion that can be connected to other brands of accelerometers, magnetic sensors, or other sensors through the second I2C port Compared with the multi-component solution, the processing (DMP: Digital Motion Processor) hardware acceleration engine eliminates the problem of the axis difference when combining the gyroscope and the accelerator, and reduces a large amount of packaging space. In specific applications, hyperthermia convulsions are manifestations of involuntary movement when the body temperature is above 38°C, and are pathological phenomena of nerve and muscle diseases, manifested as involuntary muscle contractions and joint movements. Accelerometers are used to determine whether convulsions occur by analyzing the movement posture of the monitored child.

The MCU circuit 204 with bluetooth function adopts the CC2541F256 of TI Company as the bluetooth MCU. The CC2541F256 is a true system-on-chip power optimized for Bluetooth low energy and proprietary 2.4GHz applications. It consumes about 18mA during normal transmission, and the current in sleep PM3 mode will be less than 10uA, and supports multi-terminal transmission, so that both parents can receive and transmit data at the same time.

The child monitor can also include a power supply unit, such as a button battery 205 or a reference regulated power supply 206 , and the button battery 205 can be a 3V button battery for powering the entire system. Its model can be CR2477, and its nominal capacity is 990mA. The system can work continuously for more than one week when the working voltage and MCU working frequency are lowered, sleep is used, and inactive modules are turned off in time.

The reference voltage of the reference regulated power supply circuit 206 is 2.5V. The reference voltage source TL431 is used for AD conversion reference voltage and body temperature thermistor sampling power supply.

In a specific application implementation, the Bluetooth chip CC2541F256 adopts the Bluetooth 4.0 BLE protocol. In terms of software design, the thermistor MF54-503E39501830 is used for real-time body temperature measurement, and the high-precision temperature and humidity sensor SHT25 is used for judging whether children kick the quilt and bedwetting. The acceleration data of the six-axis motion processing sensor MPU6050 is judged.

Specifically, a special algorithm is used in the judgment of hyperthermia convulsions, especially to distinguish children's normal movements from hyperthermia muscle convulsions. As shown in Figure 3, three sets of acceleration value data are actually measured, including acceleration value data obtained from normal breathing and human body shaking. When breathing normally, the acceleration value changes slowly and tends to be stable; when the body shakes, the acceleration value changes sharply and fluctuates obviously. When breathing normally, the acceleration values of at least two axes are stable; when the body shakes, the acceleration values of at least two axes change drastically. When breathing normally, the difference between the maximum value and the minimum value is less than 1.00; when the body shakes, the difference between the maximum value and the minimum value is greater than 2.50.

In the implementation of the specific high-temperature convulsion discrimination algorithm, as shown in Figure 4 and Figure 5, 100ms is the sampling period, and 3S is the monitoring period. In one detection cycle, 30 acceleration sampling values will be obtained. Proper processing and filtering of the 30 sampling values can determine whether there is body shaking, and with the temperature value, it can be judged whether convulsions have occurred.

The algorithm is divided into two cycle stages: sampling cycle stage and detection cycle stage. Sampling cycle: first read the initial value of the three-axis acceleration, then convert the initial value obtained by sampling into a floating-point acceleration value with positive and negative values, and finally place the acceleration values of the X, Y, and Z axes in their corresponding Sort the array, leaving the largest three values A1, A2, A3 (A1>A2>A3) and the smallest three values B1, B2, B3 (B1<B2<B3). Detection cycle: 1. Read the temperature value and convert it into a floating-point variable; 2. Determine whether the temperature is greater than the body temperature threshold of 38°C, and set the corresponding flag; 3. Process the array storing the acceleration value: 1 ) to remove a maximum value and a minimum value (ie A1 and B1), take A2 and A3, and the average values A_max and B_min of B2 and B3, and then calculate the absolute value D_value of the difference between the two, which is the first software filtering; 2) Determine whether D_value is greater than the acceleration threshold, and set the corresponding flag. Judging whether at least two bands appear, if so, it is judged as body shaking, setting the corresponding flag, and issuing 'warning', which is the second software filtering; 3) judging whether the body shaking is continuous, when the continuous shaking accumulates When a certain number of times, it is judged that twitch occurs, and the corresponding flag is set. Determine the temperature condition, and if it is met, send out 'Danger'. 4) When the monitoring cycle ends, all flags and arrays are cleared for the next judgment.

The above is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the invention and the content of the accompanying drawings, or directly or indirectly used in other related All technical fields are equally included in the scope of patent protection of the present invention.

Claims (9)

1. A wearable children's febrile convulsion monitoring device, comprising a belt, a body temperature measurement unit, a state measurement unit and an information processing unit, is characterized in that: The belt is configured to be fixed with the subject to be monitored, and is used to connect the body temperature measurement unit, the state measurement unit and the information processing unit in series; The body temperature measurement unit includes a body temperature measurement sensor for measuring the body temperature of the object to be monitored; The state measurement unit includes at least one measurement module, which is used to measure the temperature around the object to be monitored, the humidity around the object to be monitored, and the motion state of the object to be monitored; The information processing unit is electrically connected with the body temperature measurement unit and the state measurement unit, and is used for processing the state parameters measured by the body temperature and state measurement units. 2. The wearable children's febrile convulsion monitoring device according to claim 1, wherein the monitor also includes a PCBA board shell, and the state measurement unit and the information processing unit are arranged on a PCBA board, so that The PCBA board is arranged inside the PCBA board shell, and the PCBA board shell is sleeved on the belt. 3. The wearable children's febrile convulsion monitoring device according to claim 1, wherein the body temperature measurement unit also includes a body temperature measurement probe and a body temperature measurement shell, and the body temperature measurement probe is used for contacting with the object to be monitored For body temperature measurement, the body temperature measurement probe is at least partly located outside the body temperature measurement housing, and the part located inside the body temperature measurement housing is connected to the body temperature measurement sensor. 4. The wearable children's febrile convulsion monitoring device according to claim 3, wherein the body temperature measuring probe is a thermistor, and an insulating material is coated on the area where the thermistor is located outside the measurement housing. 5. The wearable child febrile convulsion monitoring device according to claim 3, wherein the body temperature measurement shell is in the shape of an elliptical cylinder, made of silica gel, and is sleeved on the belt. The belt is straddled over the shoulders and armpits of the child during use, and the length can be adjusted according to the condition of the subject to be monitored. 6. The wearable child febrile seizure monitoring device according to claim 1, wherein the processing steps of the information processing unit include judging whether the body temperature exceeds the body temperature threshold, judging whether the acceleration exceeds the acceleration threshold, and judging whether the convulsion occurs. 7. The wearable children's febrile seizure monitoring device according to claim 1, wherein the processing step of the information processing unit includes judging whether the surrounding temperature of the subject to be monitored and the body temperature of the subject to be monitored exceed the temperature difference threshold and judging whether to kick the quilt . 8 . The wearable child febrile seizure monitoring device according to claim 1 , wherein the processing step of the information processing unit includes judging whether the surrounding humidity of the subject to be monitored exceeds the humidity threshold and judging whether the bedwetting. 9. The wearable children's febrile convulsion monitoring device according to claim 1, wherein the information processing unit further includes a Bluetooth communication module, and the Bluetooth communication module is used to transmit the results processed by the information processing unit via Bluetooth to an external device.