A method and system for monitoring spontaneous breathing rate in newborns

Abstract

This invention belongs to the field of ventilator technology, and particularly relates to a method and system for monitoring the spontaneous respiratory rate of newborns. The method includes: acquiring pressure values ​​of the subject through an abdominal breathing sensor at set intervals; storing pressure values ​​that meet a first requirement after processing with a low-pass filter; calculating the average value of the stored pressure values ​​up to a set number N; extracting n pressure values ​​and their corresponding times that meet a second requirement based on the average value; and calculating the subject's spontaneous respiratory rate from the corresponding times. This invention takes into account that newborns mostly use abdominal breathing, and the pressure changes generated by the abdominal rise and fall of the sensor eliminate the influence of false triggering or non-triggering, thereby achieving accurate monitoring.

Description

Technical Field

[0001] This invention belongs to the field of ventilator technology, and in particular relates to a method and system for monitoring the spontaneous breathing rate of newborns. Background Technology

[0002] A ventilator is a device that can replace, control, or alter a person's normal physiological breathing, increase lung ventilation, improve respiratory function, reduce the work of breathing, and conserve cardiac reserve. Ventilators offer various ventilation modes, one of which is PEEP (Positive End Expiratory Pressure). PEEP maintains a certain pressure in the airway at the end of expiration under intermittent positive pressure ventilation, playing an important role in the treatment of acute respiratory distress syndrome, non-cardiac pulmonary edema, and pulmonary hemorrhage.

[0003] Respiratory rate is a crucial monitoring parameter in mechanical ventilation control, representing the number of breaths per minute, and is one of the vital signs. During mechanical ventilation, the patient's spontaneous respiratory rate is monitored. Current ventilator equipment uses changes in pressure or flow rate during respiration to determine whether inspiration is triggered and calculate the spontaneous respiratory rate.

[0004] Because newborns have underdeveloped respiratory center regulation and immature respiratory muscles, their breathing mainly relies on diaphragmatic movement, primarily abdominal breathing with relatively shallow chest wall movement. Monitoring using the methods described above can lead to some errors, making the assessment of abdominal movement a necessary monitoring method.

[0005] Currently, most commonly used spontaneous breathing monitoring methods typically use changes in flow rate or pressure to determine whether inspiration is triggered. The specific procedure for this detection method is as follows:

[0006] 1) Determine if there is an inhalation trigger based on the set flow or pressure threshold;

[0007] 2) After each inhalation is triggered, the current time is stored in an array of 5 elements;

[0008] 3) Calculate the total time for 5 respiratory cycles;

[0009] 4) Finally, calculate the respiratory rate within 1 minute using the total time of 5 respiratory cycles.

[0010] This detection method mainly calculates respiratory rate based on whether inhalation triggers occur. However, for flow or pressure triggers, doctors need to set the trigger threshold independently according to the strength of the newborn's breathing. Furthermore, when there is uneven breathing pressure or flow, the requirements for setting the trigger threshold are very strict, which may result in false triggering or no triggering. Summary of the Invention

[0011] The purpose of this invention is to overcome the shortcomings of the prior art and to propose a method for monitoring spontaneous breathing frequency in newborns using an abdominal breathing sensor.

[0012] To achieve the above objectives, this invention proposes a method for monitoring spontaneous breathing rate in newborns using an abdominal breathing sensor, the method comprising:

[0013] The pressure value of the subject is acquired through an abdominal breathing sensor at set intervals.

[0014] After processing by a low-pass filter, the pressure values ​​that meet the first requirement are stored.

[0015] Calculate the average value of the storage pressure values ​​that reach the set quantity N;

[0016] Based on the average value, extract the n pressure values ​​and corresponding times that meet the second requirement;

[0017] The subject's spontaneous breathing rate is calculated from the corresponding time.

[0018] As an improvement to the above method, the interval setting time is on the order of milliseconds.

[0019] As an improvement to the above method, storing the pressure value that meets the first requirement specifically includes:

[0020] Determine if the current pressure value is equal to the previous pressure value. If they are not equal, store the pressure value and the corresponding acquisition time; otherwise, do not store it.

[0021] As an improvement to the above method, the set quantity N is 1000.

[0022] As an improvement to the above method, the step of extracting n pressure values ​​and corresponding times that meet the second requirement based on the average value specifically includes: traversing each stored pressure value and extracting... A pressure value that is less than the average pressure value, and Store n pressure values ​​that are greater than the average pressure value, along with their corresponding times.

[0023] As an improvement to the above method, the calculation of the subject's spontaneous breathing rate from the corresponding time includes:

[0024] Based on the corresponding times of the stored n pressure values, the time difference between adjacent data is calculated to obtain n-1 time differences. The average of these time differences is then used as the time between two adjacent respiratory cycles to obtain the respiratory rate of the subject.

[0025] On the other hand, the present invention proposes a system for monitoring spontaneous breathing frequency in newborns using an abdominal breathing sensor, characterized in that the system comprises:

[0026] The pressure value acquisition module is used to acquire the pressure value of the subject through the abdominal breathing sensor at set intervals.

[0027] The storage module is used to store pressure values ​​that meet the first requirement after being processed by a low-pass filter;

[0028] The average value calculation module is used to calculate the average value of the storage pressure value when a set quantity N is reached;

[0029] The extraction module is used to extract n pressure values ​​and their corresponding times that meet the second requirement based on the average value;

[0030] The calculation output module is used to calculate the subject's spontaneous breathing rate from the corresponding time.

[0031] Compared with the prior art, the advantages of the present invention are:

[0032] 1. This invention takes into account that newborns mostly use abdominal breathing. The pressure change of the sensor caused by the rise and fall of the abdomen will eliminate the influence of false triggering or non-triggering, thereby achieving the purpose of accurate monitoring.

[0033] 2. The method of the present invention can effectively reduce the problem of false triggering or non-triggering by sampling pressure changes through abdominal undulation. Attached Figure Description

[0034] Figure 1 This is a flowchart of the method storage part of the present invention;

[0035] Figure 2 This is a flowchart of the calculation part of the method of the present invention. Detailed Implementation

[0036] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0037] Example 1

[0038] Embodiment 1 of the present invention proposes a method for monitoring spontaneous breathing frequency in newborns using an abdominal breathing sensor, the method comprising:

[0039] The pressure value of the subject is acquired through an abdominal breathing sensor at set intervals.

[0040] After processing by a low-pass filter, the pressure values ​​that meet the first requirement are stored.

[0041] Calculate the average value of the storage pressure values ​​that reach the set quantity N;

[0042] Based on the average value, extract the n pressure values ​​and corresponding times that meet the second requirement;

[0043] The subject's spontaneous breathing rate is calculated from the corresponding time.

[0044] The specific steps include:

[0045] The abdominal breathing sensor probe is attached to the abdomen of the subject, and the change in abdominal pressure is obtained by sampling through the pressure sensor. First, a pressure value collected through IIC (integrated circuit bus) communication is recorded every 5 milliseconds. Each time a pressure value is recorded, the pressure value is first low-pass filtered, and the pressure value that is equal to the previous pressure value is discarded. After filtering, the pressure value is stored in an array of 1000 elements s_PressureValueArr

[1000] and the time corresponding to the pressure value is stored in an array s_PressureTime

[1000] .

[0046] Considering the limited storage capacity of the processing chip and the fact that pressure is sampled every 5ms, an array of 1000 elements is defined to store the pressure values. The average value of the 1000 pressure values ​​is taken, and then the array s_PressureValueArr

[1000] is traversed to find the current pressure value that satisfies the condition that the first 10 pressure values ​​are less than the average pressure value and the last 10 pressure values ​​are greater than the average pressure value. The time corresponding to the pressure value that satisfies the condition is recorded and stored in the array s_SubTime

[20] , as well as the number of pressure values ​​that satisfy the condition s_TimeCount. Finally, the time values ​​stored in the s_SubTime

[20] array are used as the time of the respiratory cycle, and the average value of the time difference is used to calculate the respiratory rate.

[0047] Example 2

[0048] Embodiment 2 of the present invention proposes a neonatal spontaneous breathing rate monitoring system, implemented based on the method of Embodiment 1. The system includes:

[0049] The pressure value acquisition module is used to acquire the pressure value of the subject through the abdominal breathing sensor at set intervals.

[0050] The storage module is used to store pressure values ​​that meet the first requirement after being processed by a low-pass filter;

[0051] The average value calculation module is used to calculate the average value of the storage pressure value when a set quantity N is reached;

[0052] The extraction module is used to extract n pressure values ​​and their corresponding times that meet the second requirement based on the average value; and

[0053] The calculation output module is used to calculate the subject's spontaneous breathing rate from the corresponding time.

[0054] Verification results:

[0055] The neonatal ventilator was set to NCPAP (Nose Continuous Positive Airway Pressure) mode, CPAP was set to 10 cmH2O, the airflow generator was connected, and the frequency was adjusted. The frequency monitoring of the method of the present invention was compared with that of the prior art, as shown in the table below.

[0056] 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

[0057] Based on the numerical comparison of the two methods, it can be seen that this method provides more accurate monitoring values ​​for frequency, which are closer to the actual respiratory rate, and can also effectively avoid false sampling.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. 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 substitutions 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 such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for monitoring spontaneous breathing rate in newborns, the method comprising: The pressure value of the subject is acquired through an abdominal breathing sensor at set intervals. After processing by a low-pass filter, the pressure values ​​that meet the first requirement are stored. Calculate the average value of the storage pressure values ​​that reach the set quantity N; Based on the average value, extract the n pressure values ​​and corresponding times that meet the second requirement; The subject's spontaneous breathing rate was calculated from the corresponding time. The storage of pressure values ​​that meet the first requirement specifically includes: Determine if the current pressure value is equal to the previous pressure value. If they are not equal, store the pressure value and the corresponding acquisition time; otherwise, do not store it. The step of extracting n pressure values ​​and their corresponding times that meet the second requirement based on the average value specifically includes: traversing each stored pressure value and extracting... A pressure value that is less than the average pressure value, and Store n pressure values ​​that are greater than the average pressure value, along with their corresponding times; The spontaneous respiratory rate of the subject is calculated from the corresponding time; specifically, it includes: Based on the corresponding times of the stored n pressure values, the time difference between adjacent data is calculated to obtain n-1 time differences. The average of these time differences is then used as the time between two adjacent respiratory cycles to obtain the respiratory rate of the subject.

2. The method for monitoring spontaneous respiratory rate in newborns according to claim 1, characterized in that, The interval is set to a time in milliseconds.

3. The method for monitoring spontaneous respiratory rate in newborns according to claim 1, characterized in that, The set quantity N is 1000.

4. A system based on the neonatal spontaneous breathing rate monitoring method according to claim 1, characterized in that, The system includes: The pressure value acquisition module is used to acquire the pressure value of the subject through the abdominal breathing sensor at set intervals. The storage module is used to store pressure values ​​that meet the first requirement after being processed by a low-pass filter; The average value calculation module is used to calculate the average value of the storage pressure value when a set quantity N is reached; The extraction module is used to extract n pressure values ​​and their corresponding times that meet the second requirement based on the average value; and The calculation output module is used to calculate the subject's spontaneous breathing rate from the corresponding time.

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