CN112121308A - CPR feedback device and method based on double sensors - Google Patents

Abstract

The invention discloses a CPR feedback device and a method based on double sensors, which comprises a defibrillator host, an auxiliary sensor, a CPR feedback device and a main sensor; a main sensor is arranged in the CPR feedback device and used for collecting a compression signal of a patient end; the defibrillator host is internally provided with an auxiliary sensor for acquiring a vibration signal at the host end and implementing electric shock defibrillation if necessary; and removing the vibration signal at the host end from the collected pressing signal at the patient end to obtain a target pressing signal. And filtering the pressing signal, analyzing according to the pressing standard, and feeding back an analysis result to an operator. The invention solves the problem of inaccurate pressing detection caused by vibration interference of movement to the patient in the process of transferring the patient, improves the pressing detection accuracy and increases the rescue success rate.

Description

Device and method for CPR feedback based on dual sensors

technical field

The invention relates to the field of pre-hospital emergency defibrillation and resuscitation, in particular to a dual-sensor-based CPR feedback device and method.

Background technique

Sudden death is one of the biggest challenges faced by human beings and medicine in this century. Sudden cardiac death is related to arrhythmia. Timely and effective electrical defibrillation is the most important first aid measure to save the lives of patients with sudden cardiac death.

Emergency defibrillation often occurs outside the hospital and in ambulances or other transport vehicles from the scene of the occurrence to the hospital. In the process of transporting a patient, continuous cardiopulmonary resuscitation (CPR) is often required to maintain the patient's blood circulation. At the same time, in order to ensure the effect of CPR, it is necessary to continuously detect whether the compression is in place or not. However, the vibration of the transport vehicle greatly interferes with the detection of the pressing signal, thereby affecting the rescue effect. Due to the complexity of road conditions, the diversity of transfer tools, the uncertainty of the transportation environment, and the great randomness of vibration and noise, traditional filtering methods are difficult to filter effectively.

SUMMARY OF THE INVENTION

Purpose of the invention: In view of the above problems, the present invention proposes a CPR feedback device and method based on dual sensors. By designing a sensor on the patient side and the host side, the vibration signals of the patient side and the host side are respectively detected, and then collected from the patient side. The vibration signal collected by the host terminal is subtracted from the pressing signal (including the vibration signal) to obtain the target pressing signal, which realizes the elimination of the vibration signal.

Technical solution: In order to achieve the purpose of the present invention, the technical solution adopted in the present invention is: a CPR feedback device based on dual sensors, including a defibrillator host, a secondary sensor, a CPR feedback device and a main sensor; the CPR feedback device The built-in main sensor collects the pressing signal on the patient side, performs analog-to-digital conversion and processing on the pressing signal, and transmits it to the defibrillator host; the defibrillator host has a built-in secondary sensor, which collects the vibration signal on the host side, and performs analog-to-digital conversion on the vibration signal. and processing, and perform adaptive elimination with the collected pressing signal to obtain a target signal; the CPR feedback device and the defibrillator host are transmitted through differential transmission.

Further, the main sensor is an acceleration sensor, which collects the acceleration signal of the patient.

Further, the secondary sensor is an acceleration sensor, which collects the acceleration signal of the host end of the defibrillator.

Further, the acceleration sensor circuit includes a processor, a sensor, a communication circuit, a power supply circuit and a clock circuit; the power supply circuit and the clock circuit provide power and a clock, and the sensor collects the current three-axis acceleration value in real time, and transmits it to the processor through the communication circuit. , the processor performs data processing.

A dual-sensor-based CPR feedback method, comprising the steps of:

(1) The task of vibration detection on the patient side, collecting the pressing signal of the patient side, including the vibration signal; the sensor collects the acceleration signal, integrates the acceleration signal, and obtains the velocity signal; integrates the velocity signal to obtain the amplitude signal; Extract, get the frequency signal;

(2) The host-side vibration detection task, collects the vibration signal of the host-side; the sensor collects the acceleration signal, integrates the acceleration signal, and obtains the speed signal; integrates the speed signal to obtain the amplitude signal; extracts the amplitude signal periodically to obtain the frequency signal ;

(3) Self-adaptive signal elimination, subtracting the vibration signal of the host end from the pressing signal of the patient end, to obtain the target pressing signal;

(4) Perform filtering processing on the target pressing signal, analyze according to the pressing standard, and feed back the analysis result to the operator.

Further, the adaptive signal rejection includes: taking the vibration signal as the reference input x(j), the pressing signal as the original input d(j), the target signal as the output response y(j), and the error signal ε(j)= d(j)-y(j); subtract the target signal y(j) from the pressing signal d(j) to obtain the error signal ε(j), input the vibration signal x(j) into the adaptive digital filter, and the error signal ε (j) Filter and correct the input signal to obtain the real target signal y(j).

Beneficial effects: The present invention cancels the vibration signal of the patient end by adding a vibration sensor at the host end, and obtains the pressing signal of the target. The invention solves the problem of vibration interference on the patient caused by the movement of the equipment during transportation, improves the discrimination accuracy and increases the success rate of rescue. The invention also solves the problem that the traditional filtering method cannot effectively remove the noise with strong randomness. The invention improves the accuracy of pressing feedback detection and increases the success rate of rescue.

Description of drawings

Fig. 1 is a block diagram of a dual-sensor CPR feedback device;

Figure 2 sensor circuit topology diagram;

Figure 3 is a block diagram of a dual-sensor CPR feedback method;

Fig. 4 is the acceleration signal calculation process diagram;

Figure 5 is a flowchart of adaptive signal rejection.

Detailed ways

The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

As shown in FIG. 1 , the dual-sensor-based CPR feedback device of the present invention includes a defibrillator host 11 , a secondary sensor 12 , a CPR feedback device 13 and a main sensor 14 . The CPR feedback device 13 has a built-in main sensor 14 , which collects patient The defibrillator host 11 has a built-in auxiliary sensor 12 to collect the vibration signal of the host. Differential transmission is used between the CPR feedback device 13 and the defibrillator host 11 to reduce common mode interference.

As shown in FIG. 2 , in the sensor circuit block diagram of the present invention, the sensor circuit topology diagram of the defibrillator host 11 is the same as the sensor circuit topology diagram of the CPR feedback device 13 , and the typical circuit topology diagram will be described below.

The processor 21 communicates with the sensor 22 through the communication circuit 23 , and the power supply circuit and the clock circuit 24 provide power and clock.

The processor 21 has 64K Bytes Flash, more than 8K bytes SRAM and SPI peripherals. The sensor 22 can collect 3-axis acceleration data, the acceleration collection range can reach ±100g, and can realize SPI communication. The communication circuit 23 is SPI communication, which can realize the communication rate of 8M bps. The clock circuit 24 can provide a minimum clock frequency of 32.768KHz. The power supply circuit 25 can provide 3.3V100mA power supply.

When the power supply circuit 25 and the clock circuit 24 work stably, the processor 21 controls the sensor 22 to work through the communication circuit 23, collects the current three-axis acceleration value in real time, and the sensor 22 transmits it to the processor 21 at high speed through the communication circuit 23. 21 Data processing is then performed.

After the defibrillator host 11 and the CPR feedback device 13 respectively obtain the three-axis acceleration data, data transmission is performed between the two through differential communication, which can reduce common mode interference and expand the transmission distance. Differential transmission methods include but are not limited to RS485 and RS422.

As shown in Figure 3, the dual-sensor-based CPR feedback method according to the present invention includes the steps:

(S1) A patient-side signal acquisition task, which collects a patient-side pressing signal, including a vibration signal. The sensor collects the acceleration signal, integrates the acceleration signal to obtain the velocity signal; integrates the velocity signal to obtain the amplitude signal; and extracts the amplitude signal periodically to obtain the frequency signal.

(S2) The host-side vibration detection task is to collect the vibration signal of the host-side. The sensor collects the acceleration signal, integrates the acceleration signal to obtain the velocity signal; integrates the velocity signal to obtain the amplitude signal; and extracts the amplitude signal periodically to obtain the frequency signal.

(S3) Adaptive signal elimination, subtracting the vibration signal of the host side from the pressing signal and the vibration signal of the patient side to obtain the pressing signal of the target, and eliminating the vibration signal.

(S4) Signal processing, filtering the target pressing signal, then analyzing according to the pressing standard, and feeding back the analysis result to the operator.

As shown in FIG. 4 , in the acceleration signal calculation process of the present invention, the acceleration signal calculation process of the defibrillator host 11 is the same as the acceleration signal calculation process of the CPR feedback device 13. The typical acceleration signal calculation process will be described below. Include steps:

(S21) The sensor collects the acceleration signal. The sensor on the CPR feedback device side collects the acceleration signal on the patient side, and the sensor on the host side collects the acceleration signal on the host side.

(S22) Integrate the acceleration signal collected by the sensor to obtain a speed signal. Integrate the acceleration signal at the CPR feedback device end to obtain the velocity signal at the CPR feedback device end. Integrate the acceleration signal on the host side to get the speed signal on the host side.

(S23) Integrate the speed signal to obtain an amplitude signal. Integrate the velocity signal at the CPR feedback device end to obtain the amplitude signal at the CPR feedback device end. Integrate the speed signal on the host side to get the amplitude signal on the host side.

(S24) Perform spectrum analysis on the amplitude signal to obtain a frequency signal. Perform spectrum analysis on the amplitude signal at the CPR feedback device end to obtain the frequency signal at the CPR feedback device end. Perform spectrum analysis on the amplitude signal of the host to obtain the frequency signal of the host.

In the process of transferring the patient, the vibration signal of the patient side will also entrain the vibration signal of the host side. After the amplitude signal and frequency signal of the patient end and the host end are obtained respectively, the amplitude signal and frequency signal of the host end are removed from the amplitude signal and frequency signal of the patient end, and the pure amplitude signal and frequency signal of CPR can be obtained, that is, the target signal. Its implementation method is shown in Figure 5.

Taking the vibration signal as the reference input x(j), the pressing signal as the original input d(j), the target signal as the output response y(j), the error signal ε(j)=d(j)-y(j). That is, the pressing signal d(j) is subtracted from the target signal y(j) to obtain the error signal ε(j), the vibration signal x(j) is input to the adaptive digital filter, and the error signal ε(j) is filtered and corrected for the input signal, Get the real target signal y(j).

Finally, the target pressing signal is filtered and then analyzed according to the pressing standard, and the analysis result is fed back to the operator.

The above is a further description of the present invention in conjunction with specific embodiments, but researchers in the field can also make simple additions, modifications and substitutions without departing from the concept provided by the present invention. Different embodiments applying the principles of the present invention should also be included within the scope of protection of the present invention.

Claims (6)

1. A CPR feedback device based on double sensors is characterized by comprising a defibrillator host, a secondary sensor, a CPR feedback device and a primary sensor;

the CPR feedback device is internally provided with a main sensor, collects a compression signal of a patient end, performs analog-to-digital conversion and processing on the compression signal, and transmits the compression signal to a defibrillator host;

the defibrillator host is internally provided with an auxiliary sensor, collects a vibration signal at the host end, performs analog-to-digital conversion and processing on the vibration signal, and performs adaptive elimination on the vibration signal and the collected pressing signal to obtain a target signal;

the CPR feedback device and the defibrillator host are in differential transmission.

2. The dual sensor-based CPR feedback device of claim 1, wherein the primary sensor is an acceleration sensor that captures the patient-side acceleration signal.

3. The dual sensor-based CPR feedback device of claim 1, wherein the secondary sensor is an acceleration sensor that captures the defibrillator host-side acceleration signal.

4. The dual sensor-based CPR feedback device of claim 2 or 3, wherein the acceleration sensor circuit comprises a processor, a sensor, a communication circuit, a power circuit and a clock circuit; the power circuit and the clock circuit provide power and a clock, the sensor collects the current triaxial acceleration value in real time and transmits the current triaxial acceleration value to the processor through the communication circuit, and the processor performs data processing.

5. A dual sensor based CPR feedback method comprising the steps of:

(1) a patient end vibration detection task, which is used for acquiring a pressing signal of a patient end, wherein the pressing signal comprises a vibration signal; the method comprises the following steps that a sensor collects an acceleration signal and integrates the acceleration signal to obtain a speed signal; integrating the speed signal to obtain an amplitude signal; carrying out periodic extraction on the amplitude signal to obtain a frequency signal;

(2) a host end vibration detection task is carried out, and a vibration signal of the host end is collected; the method comprises the following steps that a sensor collects an acceleration signal and integrates the acceleration signal to obtain a speed signal; integrating the speed signal to obtain an amplitude signal; carrying out periodic extraction on the amplitude signal to obtain a frequency signal;

(3) self-adaptive signal elimination, namely subtracting a vibration signal at the host end from a pressing signal at the patient end to obtain a target pressing signal;

(4) and filtering the target pressing signal, analyzing according to the pressing standard, and feeding back an analysis result to an operator.

6. The dual sensor-based CPR feedback method of claim 5, wherein the adaptive signal culling comprises: using a vibration signal as a reference input x (j), a pressing signal as an original input d (j), a target signal as an output response y (j), and an error signal (j) ═ d (j) -y (j); subtracting the target signal y (j) from the pressing signal d (j) to obtain an error signal (j), inputting the vibration signal x (j) into the adaptive digital filter, and filtering and correcting the input signal by the error signal (j) to obtain a real target signal y (j).

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