CN113303784A - Respiration recognition method, ventilation equipment and storage medium - Google Patents

Respiration recognition method, ventilation equipment and storage medium Download PDF

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Publication number
CN113303784A
CN113303784A CN202110396595.7A CN202110396595A CN113303784A CN 113303784 A CN113303784 A CN 113303784A CN 202110396595 A CN202110396595 A CN 202110396595A CN 113303784 A CN113303784 A CN 113303784A
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China
Prior art keywords
patient
pressure
sensor
rate
ventilation
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CN202110396595.7A
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Chinese (zh)
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CN113303784B (en
Inventor
刘京雷
艾世明
汪超
吴礼进
周小勇
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Shenzhen Mindray Bio Medical Electronics Co Ltd
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Shenzhen Mindray Bio Medical Electronics Co Ltd
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Priority claimed from CN202110396595.7A external-priority patent/CN113303784B/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Detecting, measuring or recording devices for evaluating the respiratory organs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6813—Specially adapted to be attached to a specific body part
    • A61B5/6823—Trunk, e.g., chest, back, abdomen, hip
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/6843—Monitoring or controlling sensor contact pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/02—Details of sensors specially adapted for in-vivo measurements
    • A61B2562/0247—Pressure sensors

Abstract

The embodiment of the invention discloses ventilation equipment, which comprises a breathing identification device, a breathing loop and a ventilation control unit, wherein the breathing identification device is connected with the breathing loop; the breathing circuit is connected with the ventilation control unit and provides ventilation support for the patient under the control of the ventilation control unit; the breath recognition device is connected with the ventilation control unit; the breath identification apparatus includes: a sensor attached to the abdomen of the patient; the processing module is used for acquiring sensor pressure generated by the sensor; determining a pressure change rate according to the pressure of the sensor according to a preset change rate determination method; identifying a respiratory state of the patient from changes in the rate of change of pressure; controlling the ventilation equipment to switch the ventilation mode according to the respiratory state of the patient; wherein, the processing module controls the ventilation equipment to switch the ventilation mode according to the respiratory state of the patient, and at least comprises any one of the following switching modes: triggering an inspiratory ventilation mode if the respiratory state of the patient is to begin inspiration; the expiratory ventilation mode is triggered if the respiratory state of the patient is to begin expiration.

Description

Respiration recognition method, ventilation equipment and storage medium
Description of the cases
The present application is proposed based on the chinese patent application with application number 201910128871.4, application date 2019, 02/21, entitled "a method and apparatus for identifying breathing, ventilation device, and storage medium", which proposes a divisional case within the scope described in the chinese patent application, and the entire contents of the chinese patent application are incorporated herein by reference.
Technical Field
The invention relates to the technical field of medical instruments, in particular to a respiration identification method, ventilation equipment and a storage medium.
Background
In the process of mechanically ventilating a patient, the patient needs to be subjected to respiratory recognition in real time by ventilation equipment such as a respirator and an anesthesia machine so as to trigger a corresponding ventilation mode, and the purpose of man-machine synchronization is achieved.
At present, ventilators such as a ventilator can identify the respiratory state of a patient according to signals such as airway pressure, flow rate of the patient, diaphragm muscle electricity and the like. For example, if the patient inhales and the airway pressure drops below a certain threshold, an autonomous inspiration is identified and the ventilator needs to be triggered into an inspiratory ventilation mode.
However, the above breath identification method may be affected by the outside, the ventilation equipment itself or the difficulty of the test, which may result in inaccurate breath identification or even false identification.
Disclosure of Invention
In order to solve the above technical problems, embodiments of the present invention desirably provide a respiration recognition method, a ventilator, and a storage medium, in which a sensor is attached to an abdomen of a patient to recognize a respiration state of the patient according to a change rate of a sensor pressure generated by an abdominal movement of the patient during respiration, so as to effectively reduce an influence of an interference signal on respiration recognition and improve accuracy of the respiration recognition.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
the embodiment of the invention provides a breath identification method, which comprises the following steps:
acquiring sensor pressure generated by a sensor attached to the abdomen of a patient;
determining a pressure change rate according to the sensor pressure according to a preset change rate determination method;
identifying a respiratory state of the patient from the change in the rate of change of pressure.
In the foregoing solution, the step of determining the pressure change rate according to the sensor pressure according to the preset change rate determination method includes:
and carrying out differential operation on the sensor pressure to obtain the pressure change rate.
In the foregoing aspect, the step of determining the pressure change rate according to the sensor pressure according to the preset change rate determination method includes:
performing linear fitting on the sensor pressure within a preset fitting time period to obtain a pressure fitting curve;
and calculating the slope of the pressure fitting curve to obtain the pressure change rate.
In the above solution, the step of identifying the respiratory state of the patient according to the change of the pressure change rate includes:
if the pressure change rate is larger than a first preset threshold value, judging that the respiratory state of the patient is starting inspiration;
and if the pressure change rate is smaller than a second preset threshold value, judging that the breathing state of the patient is the beginning of expiration.
In the above solution, the step of identifying the respiratory state of the patient according to the change of the pressure change rate includes:
if the pressure change rate is larger than a first preset threshold and monotonically increases, judging that the respiratory state of the patient is starting inspiration;
and if the pressure change rate is smaller than a second preset threshold and is monotonically decreased, judging that the respiratory state of the patient is the beginning of expiration.
In the above solution, after the identifying the respiratory state of the patient according to the change of the pressure change rate, the method further comprises:
and controlling the ventilation equipment to switch the ventilation mode according to the respiratory state of the patient.
In the above aspect, the step of switching the ventilation mode of the ventilation apparatus according to the respiratory state of the patient includes:
triggering the ventilator to enter an inspiratory ventilation mode if the patient's respiratory state is to begin inspiration;
triggering the ventilator to enter an expiratory ventilation mode if the patient's respiratory state is to begin expiration.
In the above solution, the step of identifying the respiratory state of the patient according to the change of the pressure change rate includes:
if the pressure change rates are all larger than a third preset threshold value within a first preset time period, judging that the breathing state of the patient is an inspiration state;
and if the pressure change rates are all smaller than a fourth preset threshold value within a second preset time period, judging that the breathing state of the patient is the expiration state.
The embodiment of the invention provides a breath identification device, which is characterized by comprising the following components:
a sensor attached to the abdomen of the patient;
the processing module is used for acquiring the sensor pressure generated by the sensor; determining a pressure change rate according to the sensor pressure according to a preset change rate determination method; identifying a respiratory state of the patient from the change in the rate of change of pressure.
In the above apparatus, the processing module, according to a preset rate-of-change determination method, determining the rate of change of pressure based on the sensor pressure includes:
and carrying out differential operation on the sensor pressure to obtain the pressure change rate.
In the above apparatus, the processing module, according to a preset rate-of-change determination method, determining the rate of change of pressure based on the sensor pressure includes:
performing linear fitting on the sensor pressure within a preset fitting time period to obtain a pressure fitting curve;
and calculating the slope of the pressure fitting curve to obtain the pressure change rate.
In the above apparatus, the step of the processing module identifying the respiratory state of the patient from the change in the rate of change in pressure comprises:
if the pressure change rate is larger than a first preset threshold value, judging that the respiratory state of the patient is starting inspiration;
and if the pressure change rate is smaller than a second preset threshold value, judging that the breathing state of the patient is the beginning of expiration.
In the above apparatus, the step of the processing module identifying the respiratory state of the patient from the change in the rate of change in pressure comprises:
if the pressure change rate is larger than a first preset threshold and monotonically increases, judging that the respiratory state of the patient is starting inspiration;
and if the pressure change rate is smaller than the second preset threshold and is monotonically decreased, judging that the respiratory state of the patient is the beginning of expiration.
In the above apparatus, the processing module controls the ventilator to switch the ventilation mode according to the breathing state of the patient after the respiratory state of the patient is identified according to the change of the pressure change rate.
In the above apparatus, the step of the processing module controlling the ventilator to switch the ventilation mode according to the respiratory state of the patient includes:
triggering the ventilator to enter an inspiratory ventilation mode if the patient's respiratory state is to begin inspiration;
triggering the ventilator to enter an expiratory ventilation mode if the patient's respiratory state is to begin expiration.
In the above apparatus, the step of the processing module identifying the respiratory state of the patient from the change in the rate of change in pressure comprises:
if the pressure change rates are all larger than a third preset threshold value within a first preset time period, judging that the breathing state of the patient is an inspiration state;
and if the pressure change rates are all smaller than a fourth preset threshold value within a second preset time period, judging that the breathing state of the patient is the expiration state.
The embodiment of the invention provides ventilation equipment comprising the breath identification device, which comprises an air source, a breathing circuit, a ventilation control unit and a display, wherein the air source is connected with the breathing circuit;
the gas source provides gas in the process of ventilation;
the breathing circuit is connected with the gas source and the ventilation control unit, and provides ventilation support for the patient under the control of the ventilation control unit;
the breath identification device and the display are respectively connected with the ventilation control unit.
An embodiment of the present invention provides a computer-readable storage medium, which stores a respiration identification program, where the respiration identification program can be executed by a processor to implement the respiration identification method.
Therefore, the embodiment of the invention provides a respiration recognition method, which comprises the steps of acquiring sensor pressure generated by a sensor attached to the abdomen of a patient; determining a pressure change rate according to the pressure of the sensor according to a preset change rate determination method; the respiratory state of the patient is identified based on the change in the rate of change of pressure. That is to say, according to the technical scheme provided by the embodiment of the invention, the sensor is attached to the abdomen of the patient, so that the breathing state of the patient is identified according to the change rate of the sensor pressure generated by the abdominal movement of the patient during breathing, the influence of interference signals on breathing identification is effectively reduced, and the accuracy of breathing identification is improved.
Drawings
Fig. 1 is a schematic structural diagram of a breath identification apparatus according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a breath identification method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating an exemplary change in the respiratory state of a patient, in accordance with an embodiment of the present invention;
FIG. 4 is a first schematic diagram illustrating exemplary pressure changes of a sensor provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of an exemplary fitted curve provided by an embodiment of the present invention;
FIG. 6 is a second schematic diagram illustrating exemplary changes in sensor pressure provided by an embodiment of the present invention;
FIG. 7 is a graphical illustration of an exemplary rate of change of pressure provided by an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a ventilator according to an embodiment of the present invention.
Detailed Description
So that the manner in which the features and aspects of the embodiments of the present invention can be understood in detail, a more particular description of the embodiments of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings.
The embodiment of the invention provides a breath identification method which is applied to a breath identification device. Fig. 1 is a schematic structural diagram of a breath identification apparatus according to an embodiment of the present invention. As shown in fig. 1, the breath identification apparatus includes: the sensor 101 and the processing module 102 will be based on the breath identification device to describe the above breath identification method in detail below.
Fig. 2 is a schematic flow chart of a breath identification method according to an embodiment of the present invention. As shown in fig. 2, the breath identification method mainly includes the following steps:
s201, acquiring sensor pressure generated by a sensor attached to the abdomen of a patient.
In the embodiment of the present invention, the sensor 101 in the breath identification apparatus is attached to the abdomen of the patient, the breath of the patient drives the abdomen to move, so that the sensor 101 generates the pressure, and the processing module 102 can directly acquire the pressure generated by the sensor 101.
It should be noted that in the embodiment of the present invention, the sensor 101 attached to the abdomen of the patient may be a balloon, an abdomen sensor, or a pressure sensor, and the abdominal movement of the patient during breathing will generate different pressures on the sensor, so as to generate different sensor pressures. Specific sensors 101 embodiments of the present invention are not limited.
Fig. 3 is a schematic diagram illustrating an exemplary change in the respiratory state of a patient according to an embodiment of the present invention. As shown in fig. 3, the patient includes an expiratory state and an inspiratory state during breathing, for example, the inspiratory state is between the time a1 and the time b1, the expiratory state is between the time b1 and the time c1, and the two states are continuously alternated. Fig. 4 is a first schematic diagram illustrating an exemplary change in sensor pressure according to an embodiment of the present invention. As shown in fig. 4, the sensor 101 is a balloon, and compared with fig. 3, during the respiration of the patient, the sensor pressure will change, specifically, for example, from a time a1 to a time b1, during the respiration of the patient, the sensor pressure will gradually increase, at which time the patient actually inhales and the abdomen presses the balloon, while during the respiration of the patient, from a time b1 to a time c1, the sensor pressure will decrease by one step, at which time the patient actually exhales and the abdomen presses the balloon, and the dashed line in fig. 4 is the sensor pressure baseline, that is, the pressure reference value generated by the sensor 101, can be directly identified or obtained.
It should be noted that, in the embodiment of the present invention, fig. 4 is a preferable case where the sensor pressure is actually obtained in a state where the patient is breathing calmly.
It is understood that in embodiments of the present invention, sensor 101 may generate different sensor pressures as the patient's breath changes, and thus processing module 102 may continuously obtain different sensor pressures, and the specific sensor pressure is not limited by the embodiments of the present invention.
S202, determining a pressure change rate according to the pressure of the sensor according to a preset change rate determination method.
In an embodiment of the present invention, the processing module 102 may determine the pressure change rate according to the sensor pressure according to a preset change rate determination method after acquiring the sensor pressure generated by the sensor 101.
It should be noted that, in the embodiment of the present invention, a user may preset a change rate determination method in the processing module 102 according to an actual requirement, and after the processing module 102 obtains the sensor pressure generated by the sensor 101, the pressure change rate may be calculated. The specific method for determining the preset change rate is not limited in the embodiments of the present invention.
Specifically, in the embodiment of the present invention, the step of determining the pressure change rate according to the sensor pressure by the processing module 102 according to the preset change rate determining method may include: and carrying out differential operation on the pressure of the sensor to obtain the pressure change rate.
In the implementation of the present invention, the processing module 102 may obtain the sensor pressure generated by the sensor 101 in real time, and therefore, the sensor pressure obtained at each time is subtracted from the sensor pressure obtained at the previous time, so as to obtain the pressure change rate at each time. Of course, the processing module 102 may also perform the differential operation on the sensor pressure according to the preset time interval, that is, the processing module 102 may subtract the sensor pressure acquired at each time from the sensor pressure at the time before the preset time interval, so as to obtain the pressure change rate at each time. The specific differential operation process is not limited in the embodiments of the present invention.
Illustratively, in embodiments of the present invention, the predetermined time interval is T1The processing module 102 obtains a sensor pressure a generated by the sensor 101 at a time x, and obtains a time T before the time x from the time x1Is time y, and since it is acquired at time y that the sensor pressure generated by the sensor 101 is B, the model is processedBlocks a-B determine the rate of change of pressure at time x.
Specifically, in the embodiment of the present invention, the step of determining the pressure change rate according to the sensor pressure by the processing module 102 according to a preset change rate determination method may further include: performing linear fitting on the sensor pressure in a preset fitting time period to obtain a pressure fitting curve; and calculating the slope of the pressure fitting curve to obtain the pressure change rate.
It should be noted that, in the embodiment of the present invention, a user may preset a fitting time period in the processing module 102 according to an actual requirement, and since the processing module 102 obtains the sensor pressure generated by the sensor 101 in real time, that is, the sensor pressures, for each time, the sensor pressure in the previous preset fitting time period may be linearly fitted to be used as a pressure fitting curve for each time, and then the slope of the pressure fitting curve for each time is calculated, so as to obtain the pressure change rate for each time.
Fig. 5 is a schematic diagram of an exemplary fitted curve provided by an embodiment of the present invention. As shown in FIG. 5, in the embodiment of the present invention, the preset fitting time period is T2The processing module 102 obtains T at time x5 when the sensor pressure generated by the sensor 101 is V5 and the time x5 is the end time2The starting time of the time period is time x1, i.e. the time period between the start of time x1 and time x5 is T2The sensor pressure generated by the sensor 101 acquired at the time x1 is V1, and in this time period, the processing module 102 further acquires the sensor pressure V2 at the time x2, the sensor pressure V3 at the time x3, and the sensor pressure V4 at the time x4 in sequence, so that the processing module 102 performs linear fitting on V1, V2, V3, V4, and V5 to obtain a pressure fitting curve 1, and calculates a slope of the pressure fitting curve 1, which is a pressure change rate at the time x 5.
It will be appreciated that in embodiments of the present invention, the rate of change of pressure represents a specific change in sensor pressure.
And S203, identifying the respiratory state of the patient according to the change of the pressure change rate.
In an embodiment of the present invention, after the processing module 102 determines the rate of change of the pressure, the respiratory state of the patient may be identified according to the change of the rate of change of the pressure.
It can be understood that, in the embodiment of the present invention, the change of the sensor pressure in the ideal state is only shown in fig. 4, that is, the change is regular, however, in the practical application process, since the tightness degree of the sensor 101 attached to the abdomen of the patient is different, the situation of the sensor baseline drift is easily generated, therefore, the processing module 102 of the embodiment of the present invention calculates the pressure change rate, and identifies the respiratory state according to the change of the pressure change rate, so that the respiratory state of the patient can be identified more accurately.
Specifically, in an embodiment of the present invention, the step of the processing module 102 identifying the respiratory state of the patient according to the change of the pressure change rate may include: if the pressure change rate is larger than a first preset threshold value, judging that the breathing state of the patient is starting inspiration; and if the pressure change rate is smaller than a second preset threshold value, judging that the breathing state of the patient is the beginning of expiration.
It is understood that, in the embodiment of the present invention, the processing module 102 obtains the pressure change rate in real time, so that if the pressure change rate is greater than the first preset threshold, it indicates that the pressure of the sensor 101 attached to the abdomen of the patient rises, and therefore, it can be determined that the patient starts to inhale currently, and if the pressure change rate is less than the second preset threshold, it indicates that the pressure of the sensor 101 attached to the abdomen of the patient falls, and therefore, it can be determined that the patient starts to exhale currently. The specific first preset threshold and the second preset threshold may be preset according to actual requirements, and the embodiment of the present invention is not limited.
Fig. 6 is a schematic diagram of an exemplary variation of sensor pressure according to an embodiment of the present invention. As shown in fig. 6, compared to the schematic diagram of the variation of the sensor pressure shown in fig. 4, because the sensor 101 has different degrees of tightness of attachment to the abdomen of the patient, the baseline has a drift, and the acquired sensor pressure is above the initially determined sensor pressure baseline when the patient starts to inhale and exhale, it is impossible to directly determine when the patient starts to inhale and exhale. Fig. 7 is a schematic diagram illustrating an exemplary variation of the pressure change rate according to an embodiment of the present invention. As shown in fig. 7, for the pressure change rate determined from the sensor pressure of fig. 6, the first preset threshold is 0, the second preset threshold is also 0, and the pressure change rate is greater than 0 at time x1, so processing module 102 determines that the patient's respiratory state is beginning to inhale at time x1, and the pressure change rate is less than 0 at time y1, so processing module 102 determines that the patient's respiratory state is beginning to exhale at time y 1.
Specifically, in an embodiment of the present invention, the step of the processing module 102 identifying the respiratory state of the patient according to the change of the pressure change rate may further include: if the pressure change rate is larger than a first preset threshold and monotonically increases, judging that the breathing state of the patient is starting inspiration; and if the pressure change rate is smaller than a second preset threshold and is monotonically decreased, judging that the breathing state of the patient is the beginning of expiration.
It should be noted that, in the embodiment of the present invention, when the respiratory state of the patient is identified, the processing module 102 only identifies according to the pressure change rate, and of course, to avoid false identification, for example, when the pressure change rate suddenly appears when the sensor 101 is pressed by an external force at a certain time, the pressure change rate is greater than the first preset threshold or smaller than the second preset threshold, the monotonicity determination may be further increased, so as to identify the respiratory state of the patient more accurately.
It is understood that in the embodiment of the present invention, the monotonic increase or monotonic decrease of the pressure change rate is determined according to each pressure change rate within a certain time, that is, a monotonic determination time may be preset, the processing module 102 continues to obtain a period of time when the pressure change rate is greater than a first preset threshold, that is, each pressure change rate within the preset monotonic determination time, if the pressure change rate is monotonically increased, the respiratory state of the patient is determined as starting inspiration, correspondingly, the processing module 102 continues to obtain a period of time when the pressure change rate is less than a second preset threshold, that is, each pressure change rate within the preset monotonic determination time, and if the pressure change rate is monotonically decreased, the respiratory state of the patient is determined as starting expiration.
Illustratively, in the embodiment of the present invention, the monotonicity determination time is preset to T3The processing module 102 determines that the current pressure change rate is P1 and is greater than the first preset threshold 0 at the time x1, at this time, the processing module 102 continues to acquire the sensor pressure by using the time x1 as the starting time, and determines T3And (3) determining the pressure change rates P2, P3, P4, P5 and P6 in sequence at each time in the time period, and judging the respiratory state of the patient as starting inspiration if P1, P2, P3, P4, P5 and P6 are in a sequentially increasing relationship.
Illustratively, in the embodiment of the present invention, the monotonicity determination time is preset to T3The processing module 102 determines that the current pressure change rate is Q1 and is smaller than the second preset threshold 0 at the time y1, at this time, the processing module 102 continues to acquire the sensor pressure by taking the time y1 as the starting time, and determines T3And (3) determining the pressure change rates Q2, Q3, Q4, Q5 and Q6 in sequence at each time in the time period, and if Q1, Q2, Q3, Q4, Q5 and Q6 are in a descending relationship in sequence, judging the respiratory state of the patient as the beginning of expiration.
It is understood that, in the embodiment of the present invention, the above two specific methods for identifying the respiratory state of the patient can identify that the patient has just started to inhale or has just started to exhale, which is beneficial for adjusting and controlling the corresponding ventilation mode according to the respiratory state of starting to inhale and exhale.
Specifically, in an embodiment of the present invention, the step of the processing module 102 identifying the respiratory state of the patient according to the change of the pressure change rate may further include: if the pressure change rates are all larger than a third preset threshold value within a first preset time period, judging that the breathing state of the patient is an inspiration state; and if the pressure change rates are all smaller than a fourth preset threshold value within a second preset time period, judging that the respiratory state of the patient is the expiratory state.
It will be appreciated that in embodiments of the invention, in certain ventilation modes, for example, Continuous Positive Airway Pressure (CPAP), the ventilation device will provide a Continuous flow of Positive Pressure gas into the Airway of the patient, and there is no need to explicitly determine when the patient should begin inhalation or exhalation in order to make adjustments to the flow delivery, but rather, the patient may be directly determined whether the patient is in an inhalation state or an exhalation state based on changes in the rate of change of Pressure.
It should be noted that, in the embodiment of the present invention, a user may set a first preset time period, a second preset time period, a third preset threshold, and a fourth preset threshold according to an actual requirement, which is not limited in the embodiment of the present invention.
For example, in the embodiment of the present invention, the first preset time period is T4, the second preset time period is T5, the third preset threshold is 0, and the fourth preset threshold is also 0, so that if starting at a certain time, the processing module 102 sequentially obtains the pressure change rates within the duration of T4 includes: the magnitude relationships among Q1, Q2 and Q3, Q1, Q2 and Q3 are not limited, and the respiratory state of the patient is determined to be an inspiratory state as long as all are greater than 0, and the respiratory state of the patient is determined to be an expiratory state as long as all are less than 0.
It should be noted that, in the embodiment of the present invention, after identifying the respiratory state of the patient, the processing module 102 may further perform related control of ventilation according to the respiratory state of the patient, that is, after step S203, the processing module may further include step S204, which includes the following specific steps:
and S204, controlling the ventilation equipment to switch the ventilation mode according to the respiratory state of the patient.
Specifically, in the embodiment of the present invention, the step of controlling the ventilator to switch the ventilation mode according to the breathing state of the patient includes: triggering the ventilator to enter an inspiratory ventilation mode if the patient's respiratory state is to begin inspiration; if the patient's respiratory state is to begin exhalation, the ventilator is triggered to enter an expiratory ventilation mode.
It will be appreciated that in embodiments of the present invention, if the processing module 102 identifies the patient's breathing state as beginning inspiration, i.e., when the ventilator is required to deliver a certain flow of gas to the patient to support the patient's inspiration, the ventilator is triggered to enter the inspiratory ventilation mode, and if the processing module 102 identifies the patient's breathing state as beginning expiration, i.e., when the patient is exhaling, the ventilator is required to stop delivering the flow of gas to the patient, thereby triggering the ventilator to enter the expiratory ventilation mode.
It should be noted that, in the embodiment of the present invention, since two methods for identifying the start of inhalation and the start of exhalation are described in detail in the above step S203, the time for triggering the ventilator to perform the corresponding ventilation mode is determined according to the identified time.
Specifically, in the embodiment of the present invention, if the processing module 102 determines to start inspiration or start expiration only according to the comparison between the pressure change rate and the first preset threshold and the second preset threshold, the processing module 102 triggers the ventilator to enter the inspiration ventilation mode or the expiration ventilation mode in real time according to the comparison result after comparing the magnitude relationship between the pressure change rate and the thresholds in real time.
Specifically, in the embodiment of the present invention, if the processing module 102 determines to start inhalation or start exhalation according to the comparison between the pressure change rate and the first preset threshold and the second preset threshold and monotonically decreases, the corresponding ventilation mode may be triggered after determining that the pressure change rate monotonically increases or decreases, or may be triggered after monotonically increasing or decreasing for a certain time.
It is understood that, in the embodiment of the present invention, the processing module 102 may identify the breathing state of the patient according to the change of the pressure change rate, so that the switching of the ventilation mode may be controlled more accurately and timely to meet the actual ventilation requirement of the patient.
The embodiment of the invention provides a respiration identification method, which comprises the steps of acquiring sensor pressure generated by a sensor attached to the abdomen of a patient; determining a pressure change rate according to the pressure of the sensor according to a preset change rate determination method; the respiratory state of the patient is identified based on the change in the rate of change of pressure. That is to say, according to the technical scheme provided by the embodiment of the invention, the sensor is attached to the abdomen of the patient, so that the breathing state of the patient is identified according to the change rate of the sensor pressure generated by the abdominal movement of the patient during breathing, the influence of interference signals on breathing identification is effectively reduced, and the accuracy of breathing identification is improved.
Another embodiment of the present invention provides a respiration recognition apparatus, as shown in fig. 1, which mainly includes:
a sensor 101 attached to the abdomen of the patient;
the processing module 102 is used for acquiring the sensor pressure generated by the sensor; determining a pressure change rate according to the sensor pressure according to a preset change rate determination method; identifying a respiratory state of the patient from the change in the rate of change of pressure.
Optionally, the step of determining, by the processing module 102 according to a preset change rate determining method, a pressure change rate according to the sensor pressure includes:
and carrying out differential operation on the sensor pressure to obtain the pressure change rate.
Optionally, the step of determining, by the processing module 102 according to a preset change rate determining method, a pressure change rate according to the sensor pressure includes:
performing linear fitting on the sensor pressure within a preset fitting time period to obtain a pressure fitting curve;
and calculating the slope of the pressure fitting curve to obtain the pressure change rate.
Optionally, the step of the processing module 102 identifying the respiratory state of the patient according to the change of the pressure change rate includes:
if the pressure change rate is larger than a first preset threshold value, judging that the respiratory state of the patient is starting inspiration;
and if the pressure change rate is smaller than a second preset threshold value, judging that the breathing state of the patient is the beginning of expiration.
Optionally, the step of the processing module 102 identifying the respiratory state of the patient according to the change of the pressure change rate includes:
if the pressure change rate is larger than a first preset threshold and monotonically increases, judging that the respiratory state of the patient is starting inspiration;
and if the pressure change rate is smaller than the second preset threshold and is monotonically decreased, judging that the respiratory state of the patient is the beginning of expiration.
Optionally, after the respiratory state of the patient is identified according to the change of the pressure change rate, the processing module 102 controls the ventilator to switch the ventilation mode according to the respiratory state of the patient.
Optionally, the step of the processing module 102 controlling the ventilator to switch the ventilation mode according to the breathing state of the patient includes:
triggering the ventilator to enter an inspiratory ventilation mode if the patient's respiratory state is to begin inspiration;
triggering the ventilator to enter an expiratory ventilation mode if the patient's respiratory state is to begin expiration.
Optionally, the step of the processing module 102 identifying the respiratory state of the patient according to the change of the pressure change rate includes:
if the pressure change rates are all larger than a third preset threshold value within a first preset time period, judging that the breathing state of the patient is an inspiration state;
and if the pressure change rates are all smaller than a fourth preset threshold value within a second preset time period, judging that the breathing state of the patient is the expiration state.
The embodiment of the invention provides a respiration recognition device, which is used for acquiring sensor pressure generated by a sensor attached to the abdomen of a patient; determining a pressure change rate according to the pressure of the sensor according to a preset change rate determination method; the respiratory state of the patient is identified based on the change in the rate of change of pressure. That is to say, the respiration recognition device provided by the embodiment of the present invention attaches the sensor to the abdomen of the patient to recognize the respiration state of the patient according to the change rate of the sensor pressure generated by the abdominal movement of the patient during respiration, thereby effectively reducing the influence of the interference signal on the respiration recognition and improving the accuracy of the respiration recognition.
According to another embodiment of the invention, a ventilation device comprising the breath identification device is provided. Fig. 8 is a schematic structural diagram of a ventilator according to an embodiment of the present invention. As shown in fig. 8, not only includes a breath identification device 801, but also includes a gas source 802, a breathing circuit 803, a ventilation control unit 804 and a display 805;
the gas source 802, which provides gas during ventilation;
the breathing circuit 803 is connected to the gas source 802 and the ventilatory control unit 804 to provide ventilatory support to the patient under the control of the ventilatory control unit 804;
the breath identification device 801 and the display 805 are respectively connected to the ventilation control unit 804.
The embodiment of the invention also provides a computer readable storage medium, which stores a breath identification program, and the breath identification program can be executed by a processor to realize the breath identification method. The computer-readable storage medium may be a volatile Memory (volatile Memory), such as a Random-Access Memory (RAM); or a non-volatile Memory (non-volatile Memory), such as a Read-Only Memory (ROM), a flash Memory (flash Memory), a Hard Disk (Hard Disk Drive, HDD) or a Solid-State Drive (SSD); or may be a respective device, such as a mobile phone, computer, tablet device, personal digital assistant, etc., that includes one or any combination of the above-mentioned memories.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable signal processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable signal processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable signal processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable signal processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (11)

1. A ventilator comprising a breath identification device, a breathing circuit, and a ventilation control unit;
the respiratory circuit is connected with the ventilation control unit and provides ventilation support to the patient under the control of the ventilation control unit;
the breath identification device is connected with the ventilation control unit;
the breath identification apparatus includes: a sensor attached to the abdomen of the patient;
the processing module is used for acquiring the sensor pressure generated by the sensor; determining a pressure change rate according to the sensor pressure according to a preset change rate determination method; identifying a respiratory state of the patient from the change in the rate of change of pressure; controlling a ventilation device to switch ventilation modes according to the respiratory state of the patient;
wherein, the processing module controls the ventilation device to switch the ventilation mode according to the respiratory state of the patient, and at least comprises any one of the following switching modes: triggering an inspiratory ventilation mode if the respiratory state of the patient is to begin inspiration; triggering an expiratory ventilation mode if the respiratory state of the patient is to begin expiration.
2. The ventilator of claim 1, wherein said processing module determines a rate of pressure change based on said sensor pressure according to a preset rate of change determination method comprising:
and carrying out differential operation on the sensor pressure to obtain the pressure change rate.
3. The ventilator of claim 1, wherein said processing module determines a rate of pressure change based on said sensor pressure according to a preset rate of change determination method comprising:
performing linear fitting on the sensor pressure within a preset fitting time period to obtain a pressure fitting curve;
and calculating the slope of the pressure fitting curve to obtain the pressure change rate.
4. The ventilator of claim 1, wherein said processing module identifying a respiratory state of the patient from changes in said rate of pressure change comprises:
if the pressure change rate is larger than a first preset threshold and monotonically increases, judging that the respiratory state of the patient is starting inspiration;
and if the pressure change rate is smaller than a second preset threshold and is monotonically decreased, judging that the respiratory state of the patient is the beginning of expiration.
5. The ventilator of claim 1, wherein said processing module identifying a respiratory state of the patient from changes in said rate of pressure change comprises:
if the pressure change rates are all larger than a third preset threshold value within a first preset time period, judging that the breathing state of the patient is an inspiration state;
and if the pressure change rates are all smaller than a fourth preset threshold value within a second preset time period, judging that the breathing state of the patient is the expiration state.
6. A method of breath identification, the method comprising:
acquiring sensor pressure generated by a sensor attached to the abdomen of a patient;
determining a pressure change rate according to the sensor pressure according to a preset change rate determination method;
identifying a respiratory state of the patient from the change in the rate of change of pressure;
controlling a ventilation device to switch ventilation modes according to the respiratory state of the patient;
wherein, the control of the ventilation device to switch the ventilation mode according to the respiratory state of the patient at least comprises any one of the following switching modes: triggering an inspiratory ventilation mode if the respiratory state of the patient is to begin inspiration; triggering an expiratory ventilation mode if the respiratory state of the patient is to begin expiration.
7. The method of claim 6, wherein said step of determining a rate of change of pressure from said sensor pressure in accordance with a preset rate of change determination method comprises:
and carrying out differential operation on the sensor pressure to obtain the pressure change rate.
8. The method of claim 6, wherein said step of determining a rate of change of pressure from said sensor pressure in accordance with a preset rate of change determination method comprises:
performing linear fitting on the sensor pressure within a preset fitting time period to obtain a pressure fitting curve;
and calculating the slope of the pressure fitting curve to obtain the pressure change rate.
9. The method of claim 6, wherein the step of identifying the respiratory state of the patient from the change in the rate of pressure change comprises:
if the pressure change rate is larger than a first preset threshold and monotonically increases, judging that the respiratory state of the patient is starting inspiration;
and if the pressure change rate is smaller than a second preset threshold and is monotonically decreased, judging that the respiratory state of the patient is the beginning of expiration.
10. The method of claim 6, wherein the step of identifying the respiratory state of the patient from the change in the rate of pressure change comprises:
if the pressure change rates are all larger than a third preset threshold value within a first preset time period, judging that the breathing state of the patient is an inspiration state;
and if the pressure change rates are all smaller than a fourth preset threshold value within a second preset time period, judging that the breathing state of the patient is the expiration state.
11. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a breath identification program executable by a processor to implement the breath identification method according to any one of claims 6 to 10.
CN202110396595.7A 2019-02-21 Breath identification method, ventilation equipment and storage medium Active CN113303784B (en)

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