CN116236178A - Neonate spontaneous respiratory rate monitoring method and neonate spontaneous respiratory rate monitoring system - Google Patents

Abstract

The invention belongs to the technical field of respirators, and particularly relates to a method and a system for monitoring spontaneous respiratory rate of newborns. The method comprises the following steps: acquiring a pressure value of a detected person through an abdomen respiration sensor at intervals of set time; after being processed by a low-pass filter, the pressure value meeting the first requirement is stored; averaging the stored pressure values up to the set number N; extracting n pressure values and corresponding time meeting the second requirement according to the average value; and calculating the spontaneous respiratory frequency of the detected person according to the corresponding time. According to the invention, the neonate mostly adopts abdominal respiration, and the influence of false triggering or non-triggering can be eliminated according to the pressure change generated by abdominal fluctuation on the sensor, so that the aim of accurate monitoring is fulfilled.

Description

A method and system for monitoring spontaneous breathing frequency of newborns

technical field

The invention belongs to the technical field of ventilators, and in particular relates to a method and system for monitoring spontaneous breathing frequency of newborns.

Background technique

Ventilator is a device that can replace, control or change people's normal physiological breathing, increase lung ventilation, improve respiratory function, reduce breathing work consumption, and save heart reserve capacity. The ventilator has a variety of ventilation methods, and PEEP (Positive End Expiratory Pressure) is one of them. It maintains a certain pressure in the airway at the end of expiration under the premise of intermittent positive pressure ventilation. It plays an important role in respiratory distress syndrome, noncardiogenic pulmonary edema, and pulmonary hemorrhage.

Respiratory frequency is an important monitoring parameter in the ventilation control process of the ventilator, which represents the number of breaths per minute and is one of the important vital signs. The ventilator monitors the patient's spontaneous breathing rate during ventilation. Current ventilator equipment uses changes in pressure or flow during breathing to determine whether to trigger inhalation to calculate the spontaneous breathing rate.

Due to the insufficiency of the neonatal respiratory center regulation function and the immature development of the respiratory muscles, the breathing mainly depends on the movement of the diaphragm, mainly abdominal breathing and shallow thoracic movement. There will be certain errors in monitoring with the above methods, and judging the rise and fall of the abdomen is a very necessary monitoring method.

Currently, the most commonly used spontaneous breathing monitoring methods usually use changes in flow or pressure to determine whether to trigger inhalation. The specific process of this detection method is as follows:

1) Judging whether there is an inspiratory trigger according to the set flow or pressure threshold;

2) After each inhalation is triggered, the current time is stored in an array of 5 elements;

3) Calculate the total time of 5 breathing cycles;

4) Finally, use the total time of 5 breathing cycles to calculate the breathing rate within 1 minute.

This detection method mainly calculates the respiratory rate based on whether there is an inspiratory trigger, but for the trigger of flow or pressure, the doctor needs to set the trigger threshold independently according to the strength of the newborn's breathing, and when there is uneven respiratory pressure or flow, the setting The trigger threshold is very strict, and false triggering or non-triggering may occur.

Contents of the invention

The purpose of the present invention is to overcome the defects of the prior art, and proposes a method for monitoring spontaneous breathing frequency with an abdominal respiration sensor for newborns.

In order to achieve the above object, the present invention proposes a method for monitoring spontaneous breathing frequency with an abdominal respiration sensor for newborns, said method comprising:

The interval setting time is used to obtain the pressure value of the detected person through the abdominal respiration sensor;

After being processed by a low-pass filter, the pressure value meeting the first requirement is stored;

Calculate the average value of the stored pressure values reaching the set number N;

According to the average value, extract n pressure values and corresponding times that meet the second requirement;

The spontaneous breathing rate of the subject is calculated from the corresponding time.

As an improvement to the above method, the interval setting time is at the ms level.

As an improvement to the above method, the storage of the pressure value meeting the first requirement; specifically includes:

Determine whether the current pressure value is equal to the previous pressure value, if not, store the pressure value and the corresponding acquisition time, otherwise not store.

As an improvement to the above method, the set number N is 1000.

个小于压力平均值的压力值，以及/>

个大于压力平均值的压力值，存储上述n个压力值以及对应时间。As an improvement of the above method, the extraction of n pressure values and corresponding time that meet the second requirement according to the average value; specifically includes: traversing each stored pressure value, extracting respectively

pressure values less than the average pressure value, and />

pressure values greater than the average pressure value, and store the above n pressure values and corresponding time.

As an improvement of the above method, the spontaneous breathing rate of the subject is calculated from the corresponding time; specifically includes:

According to the corresponding time of the stored n pressure values, calculate the time difference of adjacent data respectively to obtain n-1 time differences, calculate the average value of the above time differences, and use the average value of the time difference as the time of two adjacent breathing cycles to calculate Obtain the respiratory rate of the subject.

On the other hand, the present invention proposes a system for monitoring spontaneous breathing frequency with an abdominal respiration sensor for newborns, characterized in that the system includes:

The pressure value acquisition module is used to obtain the pressure value of the detected person through the abdominal respiration sensor at intervals of set time;

The storage module is used to store the pressure value meeting the first requirement after being processed by the low-pass filter;

An average value calculation module, which is used to calculate the average value of the stored pressure values reaching the set number N;

An extraction module, configured to extract n pressure values and corresponding times that meet the second requirement according to the average value;

The calculation output module is used to calculate the spontaneous breathing rate of the detected person from the corresponding time.

Compared with the prior art, the present invention has the advantages of:

1. The present invention takes into account that newborns often adopt abdominal breathing, and the pressure change of the sensor according to the abdominal ups and downs will eliminate the influence of false triggering or non-triggering, so as to achieve the purpose of accurate monitoring;

2. The method of the present invention can well reduce the problem of false triggering or non-triggering through the pressure change sampled by abdominal ups and downs.

Description of drawings

Fig. 1 is a flow chart of the storage part of the method of the present invention;

Fig. 2 is a flow chart of the calculation part of the method of the present invention.

Detailed ways

The technical solutions of the present invention will be described in detail below in conjunction with the drawings and embodiments.

Example 1

Embodiment 1 of the present invention proposes a method for monitoring spontaneous breathing frequency with an abdominal respiration sensor for newborns, the method comprising:

The interval setting time is used to obtain the pressure value of the detected person through the abdominal respiration sensor;

After being processed by a low-pass filter, the pressure value meeting the first requirement is stored;

Calculate the average value of the stored pressure values reaching the set number N;

According to the average value, extract n pressure values and corresponding times that meet the second requirement;

The spontaneous breathing rate of the subject is calculated from the corresponding time.

Specific steps include:

Attach the abdominal respiration sensor probe to the abdomen of the subject to be tested, and obtain changes in abdominal pressure through pressure sensor sampling. First, record a pressure value collected through IIC (integrated circuit bus) communication every 5 milliseconds. Every time the pressure value is recorded, the pressure value is first low-pass filtered, and the value equal to the previous pressure value is discarded. Then store the pressure value in the array s_PressureValueArr[1000] with 1000 elements and the time corresponding to the pressure value in the array s_PressureTime[1000].

Considering the limited storage capacity of the processing chip and the pressure is sampled every 5ms, define an array of 1000 elements to store the pressure value, average the 1000 pressure values, and then traverse the array s_PressureValueArr[1000] to obtain the current pressure value that satisfies the first 10 The pressure value is less than the average pressure value and the last 10 pressure values are greater than the average pressure value, and record the time corresponding to the pressure value that meets the condition, and store the time in the array s_SubTime[20], and the corresponding pressure value that meets the condition Count s_TimeCount, and finally take the time difference stored in the s_SubTime[20] array as the time of the breathing cycle, and take the average value of the time difference to calculate the breathing frequency.

Example 2

Embodiment 2 of the present invention proposes a neonatal spontaneous breathing frequency monitoring system, which is implemented based on the method of Embodiment 1. The system includes:

The pressure value acquisition module is used to obtain the pressure value of the detected person through the abdominal respiration sensor at intervals of set time;

The storage module is used to store the pressure value meeting the first requirement after being processed by the low-pass filter;

An average value calculation module, which is used to calculate the average value of the stored pressure values reaching the set number N;

An extraction module, configured to extract n pressure values and corresponding times that meet the second requirement according to the average value; and

The calculation output module is used to calculate the spontaneous breathing rate of the detected person from the corresponding time.

Verification effect:

Set the newborn infant ventilator to NCPAP (nasal continuous positive airway pressure mode) mode, set CPAP (continuous positive airway pressure)=10cmH ₂ O, connect the airflow generating device, adjust the frequency, compare the method of the present invention with The frequency monitoring of the prior art is shown in the table below.

set frequency value This method monitors frequency values Existing methods monitor frequency values 5 5 5 30 30 30 60 60 61 120 121 125

According to the numerical comparison of the two methods, it can be seen that this method has a more accurate monitoring value for frequency monitoring, which is closer to the actual respiratory frequency, and can also avoid mis-sampling well.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than limit them. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent replacements to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all of them should be included in the scope of the present invention. within the scope of the claims.

Claims (7)

1. A neonatal spontaneous breathing rate monitoring method, said method comprising: The interval setting time is used to obtain the pressure value of the detected person through the abdominal respiration sensor; After being processed by a low-pass filter, the pressure value meeting the first requirement is stored; Calculate the average value of the stored pressure values reaching the set number N; According to the average value, extract n pressure values and corresponding times that meet the second requirement; The spontaneous breathing rate of the subject is calculated from the corresponding time. 2. The method for monitoring the spontaneous breathing rate of newborns according to claim 1, wherein the interval setting time is in the order of ms. 3. The neonatal spontaneous breathing rate monitoring method according to claim 1, wherein the pressure value meeting the first requirement is stored; specifically comprising: Determine whether the current pressure value is equal to the previous pressure value, if not, store the pressure value and the corresponding acquisition time, otherwise not store. 4. The method for monitoring the spontaneous breathing rate of newborns according to claim 1, wherein the set number N is 1000. 5. The method for monitoring the spontaneous breathing rate of newborns according to claim 1, characterized in that, according to the average value, extracting n pressure values and corresponding times meeting the second requirement; specifically comprising: traversing each stored pressure value, extracted separately

pressure values less than the average pressure value, and />

pressure values greater than the average pressure value, and store the above n pressure values and corresponding time. 6. The neonatal spontaneous breathing rate monitoring method according to claim 1, characterized in that, the calculated spontaneous breathing rate of the detected person by the corresponding time; specifically includes: According to the corresponding time of the stored n pressure values, calculate the time difference of adjacent data respectively to obtain n-1 time differences, calculate the average value of the above time differences, and use the average value of the time difference as the time of two adjacent breathing cycles to calculate Obtain the respiratory rate of the subject. 7. A neonatal spontaneous breathing rate monitoring system, characterized in that the system comprises: The pressure value acquisition module is used to obtain the pressure value of the detected person through the abdominal respiration sensor at intervals of set time; The storage module is used to store the pressure value meeting the first requirement after being processed by the low-pass filter; The average value calculation module is used to calculate the average value of the stored pressure values reaching the set number N; the extraction module is used to extract n pressure values and corresponding times that meet the second requirement according to the average value; and The calculation output module is used to calculate the spontaneous breathing rate of the detected person from the corresponding time.

Images