WO2016202156A1

WO2016202156A1 - Inhalation triggering control method and device utilizing same

Info

Publication number: WO2016202156A1
Application number: PCT/CN2016/083462
Authority: WO
Inventors: 邹栋; 黄裕钦; 吴本清
Original assignee: 深圳市科曼医疗设备有限公司
Priority date: 2015-06-19
Filing date: 2016-05-26
Publication date: 2016-12-22
Also published as: CN105031785B; CN105031785A

Abstract

An inhalation triggering control method and device utilizing the same. The inhalation triggering control method comprises the following steps: detecting first pressure information of an airbag prearranged on an object to be tested (S10); determining, according to the first pressure information and a preset default value, a respiration state of the object to be tested (S20); and outputting, when the respiration state indicates an inhaling state, an inhalation triggering control signal (S30). The inhalation triggering control device comprises: a first detection module (10), configured to detect first pressure information of an airbag prearranged on an object to be tested; a processing module (20), configured to determine, according to the first pressure information and a preset default value, a respiration state of the object to be tested; and a control module (30), configured to output, when the respiration state indicates an inhaling state, an inhalation triggering control signal. The inhalation triggering control method and device utilizing the same reduce a cost of breath detection, providing a reliable trigger for use in a continuous positive airway pressure ventilator.

Description

Inhalation trigger control method and device

[Technical Field]

The present invention relates to the field of medical device technology, and in particular, to an inhalation trigger control method and apparatus.

【Background technique】

At present, in medical equipment, in order to achieve synchronous detection of the patient's breathing, the ventilator's flow rate, pressure, and diaphragmatic electrokinetic inhalation trigger are mainly used. The flow rate and pressure inhalation triggering mode of the ventilator are used more in the invasive ventilator. Due to the characteristics of the non-invasive ventilator leaking, it is rarely used. In addition, in the diaphragmatic electrokinetic inhalation trigger, a sensor needs to be placed through the nose. In the stomach, the sensor can transmit the electronic signal of the diaphragm to the ventilator, and the ventilator performs synchronous inhalation and air supply according to the signal. The disadvantage of this method is that the cost of the clinical detection of the sensor is high, resulting in high cost of respiratory detection. And the clinical operation is complicated.

The above content is only used to assist in understanding the technical solutions of the present invention, and does not constitute an admission that the above is prior art.

[Summary of the Invention]

The main object of the present invention is to provide an inhalation trigger control method and apparatus, which aims to reduce the cost of respiratory detection.

To achieve the above object, the present invention provides an inhalation trigger control method, and the inhalation trigger control method includes the following steps:

Detecting first pressure information of the airbag preset on the object to be tested;

Determining a breathing state of the object to be tested according to the first pressure information and a preset standard value;

When the breathing state is the inhalation state, the inhalation trigger control signal is output.

Preferably, the inhalation trigger control method further includes:

Second pressure information for detecting atmospheric pressure;

Determining, according to the first pressure information and the preset standard value, the breathing state of the object to be tested includes:

Obtaining a pressure difference signal corresponding to a difference between a pressure of the airbag and an atmospheric pressure according to the detected first pressure information and the second pressure information;

Amplifying the pressure difference signal by error;

Determining whether the voltage value corresponding to the amplified pressure difference signal is greater than a preset standard value;

When the voltage value corresponding to the amplified pressure difference signal is greater than a preset value, determining that the breathing state of the object to be tested is an inhalation state.

Preferably, the determining whether the voltage value corresponding to the amplified pressure difference signal is greater than a preset standard value comprises:

Performing the second-order low-pass active filtering process on the pressure difference signal, and converting the signal into a digital pressure signal;

Decreasing the frequency of the digital pressure signal according to preset sliding filtering;

Comparing whether the pressure value corresponding to the digital pressure signal after the frequency reduction is greater than the preset standard value every preset time period; performing the determination when the pressure value corresponding to the digital pressure signal is greater than the preset standard value The breathing state of the object to be tested is a step of inhaling.

Preferably, the step of determining that the breathing state of the object to be tested is an inhaled state further comprises:

Determining whether the pressure value corresponding to the digital pressure signal after the frequency reduction in the continuous preset number comparison is greater than the preset standard value;

When the pressure value corresponding to the digital pressure signal after the frequency reduction in the continuous preset number comparison is greater than the preset standard value, the step of determining that the breathing state of the object to be tested is the inhalation state is performed.

Preferably, the inhalation trigger control method further includes:

Adjust the size of the preset standard value.

In addition, in order to achieve the above object, the present invention also provides an inhalation trigger control device, and the inhalation trigger control device includes:

a first detecting module, configured to detect first pressure information of the airbag preset on the object to be tested;

a processing module, configured to determine a breathing state of the object to be tested according to the first pressure information and a preset standard value;

And a control module, configured to output an inhalation trigger control signal when the breathing state is an inhalation state.

Preferably, the inhalation trigger control device further includes:

a second detecting module, configured to detect second pressure information of atmospheric pressure;

The processing module includes:

An acquiring unit, configured to acquire a pressure difference signal corresponding to a difference between a pressure of the airbag and an atmospheric pressure according to the detected first pressure information and the second pressure information;

a voltage amplifying unit for performing error amplification on the pressure difference signal;

a first determining unit, configured to determine whether a voltage value corresponding to the amplified pressure difference signal is greater than a preset standard value;

The determining unit is configured to determine that the breathing state of the object to be tested is an inhaling state when a voltage value corresponding to the amplified pressure difference signal is greater than a preset value.

Preferably, the first determining unit comprises:

a signal conversion subunit, configured to perform the second-order low-pass active filtering process on the pressure difference signal, and convert the signal into a digital pressure signal;

a frequency down subunit for reducing a frequency of the digital pressure signal according to a preset sliding filter;

a comparison subunit, configured to compare whether the pressure value corresponding to the digital pressure signal after the frequency reduction is greater than the preset standard value every preset time period; when the pressure value corresponding to the digital pressure signal is greater than the preset standard value The determining unit is triggered to determine that the breathing state of the object to be tested is an inhalation state.

Preferably, the processing module further includes:

a second determining unit, configured to determine whether the pressure value corresponding to the digital pressure signal after decreasing the frequency in the continuous preset number comparison is greater than the preset standard value; and the digital pressure signal after decreasing the frequency in the continuous preset number comparison When the corresponding pressure value is greater than the preset standard value, the determining unit is triggered to determine that the breathing state of the object to be tested is an inhalation state.

Preferably, the inhalation trigger control device further includes:

The adjustment module is used to adjust the size of the preset standard value.

In the embodiment of the present invention, the airbag is preset on the object to be tested, and then the first pressure information of the airbag is detected, and the breathing state of the object to be tested is determined according to the first pressure information and a preset standard value; When the state is in the inhalation state, the inhalation trigger control signal is output; thus, the inspiratory synchronization detection is realized. Since the present invention detects the pressure of the airbag disposed on the object to be tested outside the object to be tested, the inhalation synchronous detection is realized, and the sensor is placed in the stomach for respiratory detection by the human nose, which reduces the respiratory detection. the cost of.

[Description of the Drawings]

1 is a schematic flow chart of a first embodiment of a method for controlling an inhalation trigger according to the present invention;

2 is a schematic flow chart of a second embodiment of a method for controlling an inhalation trigger according to the present invention;

3 is a schematic flow chart of a third embodiment of an inhalation trigger control method according to the present invention;

4 is a schematic flow chart of a fourth embodiment of a method for controlling an inhalation trigger according to the present invention;

5 is a schematic flow chart of a fifth embodiment of a method for controlling an inhalation trigger according to the present invention;

6 is a schematic diagram of functional modules of a first embodiment of an inhalation trigger control device according to the present invention;

7 is a schematic diagram of functional modules of a second embodiment of the inhalation trigger control device of the present invention;

8 is a schematic diagram of a refinement function module of a processing module in a second embodiment of the inhalation trigger control device of the present invention;

9 is a schematic diagram of a refinement function module of a first determining unit in a third embodiment of the inhalation triggering control device of the present invention;

10 is a schematic diagram of a refinement function module of a processing module in a fourth embodiment of the inhalation trigger control device of the present invention;

Figure 11 is a schematic diagram of the functional modules of the fifth embodiment of the inhalation trigger control device of the present invention.

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

【detailed description】

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The present invention provides an inhalation trigger control method. Referring to FIG. 1, in the first embodiment of the inhalation trigger control method of the present invention, the inhalation trigger control method has the following steps:

Step S10, detecting first pressure information of the airbag preset on the object to be tested;

The breathing trigger control method provided by the embodiment of the invention is mainly applied to the measuring system for detecting the breathing state of the living body. Specifically, the object to be tested may be a human body or an animal. In the following embodiments, the human body is taken as an example for detailed description. The airbag can be attached to the abdomen of the human body. According to the characteristics of the breathing, the abdomen is convex when inhaling, and the abdomen is recessed when exhaling, thereby changing the pressure in the airbag. It should be noted that the first pressure information in the airbag can be detected using a pressure sensor.

Step S20, determining a breathing state of the object to be tested according to the first pressure information and a preset standard value;

In step S30, when the breathing state is the inhalation state, the inhalation triggering control signal is output.

The size of the preset standard value may be set according to actual needs, and is not further limited herein. Specifically, the standard value can be set in a graded manner to reflect pressure detection for different sensitivities. Since the abdomen is convex when the human body inhales, the airbag is squeezed, so that the pressure inside the airbag is increased. The first pressure information is an electrical signal, and the higher the air pressure, the higher the voltage value of the corresponding electrical signal. When the voltage value is greater than the preset standard value, it is determined that the current breathing state of the human body is the inhalation state, and at this time, the inhalation triggering control signal may be output to control the corresponding setting to perform the corresponding operation.

For example, the above-described inhalation trigger control method is applied to a medical device for assisting human body breathing. Specifically, it is used to control the ventilator synchronous trigger. After the above-mentioned inhalation trigger control signal is output to the ventilator, the ventilator can perform the air supply operation by synchronously inhaling, thereby achieving the function of assisting the human body to breathe.

Further, referring to FIG. 2, in the second embodiment of the inhalation trigger control method of the present invention, the inhalation trigger control method further includes:

Step S40, detecting second pressure information of atmospheric pressure;

The above step S20 includes:

Step S21, acquiring a pressure difference signal corresponding to a difference between the pressure of the airbag and the atmospheric pressure according to the detected first pressure information and the second pressure information;

Step S22, performing error amplification on the pressure difference signal;

Step S23, it is determined whether the voltage value corresponding to the amplified pressure difference signal is greater than a preset standard value; if yes, step S24 is performed; otherwise, the inhalation trigger is not performed;

Step S24, determining that the breathing state of the object to be tested is an inhalation state.

In the embodiment of the present invention, the second pressure information reacts to the pressure signal of the atmospheric pressure, and specifically, the differential pressure type pressure sensing may be adopted, and one port of the differential pressure type pressure sensing communicates with the airbag through a connecting tube, and the airbag and the connection The tube and the sensor form a confined space; the other port of the differential pressure sensing is directly emptied, so that the change of the pressure in the airbag is a change with respect to the atmospheric pressure to avoid the influence of the change of the atmospheric pressure on the pressure signal of the airbag. The output of the differential pressure sensing will output a differential pressure signal of the difference between the pressure in the bladder and the atmospheric pressure. Since the pressure value of the airbag changes little when the human body is breathing, so that the pressure difference signal is weak, the pressure difference signal can be amplified by a preset operational amplification circuit by a preset multiple (for example, 400 times). Further, in order to consider the influence of the zero drift of the pressure sensor, 0.6 V is used as the reference voltage in the above operational amplifier circuit. The amplified voltage value is compared with a preset standard value to determine whether the human body is in an inhalation state. When the voltage value is greater than a preset standard value, it is determined that the currently detected respiratory state of the human body is an inhalation state.

Further, referring to FIG. 3, in the third embodiment of the inhalation trigger control method of the present invention, in the third embodiment of the inhalation trigger control method of the present invention, the step S23 includes:

Step S231, the second-order low-pass active filtering process is performed on the pressure difference signal, and then converted into a digital pressure signal;

Step S232, reducing the frequency of the digital pressure signal according to preset sliding filtering;

Step S233, comparing whether the pressure value corresponding to the digital pressure signal after the frequency reduction is greater than the preset standard value every preset time period; if yes, executing step S24; otherwise, not performing the inhalation trigger.

In this embodiment, the circuit structure for performing second-order low-pass active filtering may be set according to actual needs. After the second-order low-pass active filtering process is performed on the above-mentioned pressure difference signal, the analog signal is converted into a digital signal by an ADC converter. Since the output frequency of the existing ADC converter is usually a digital pressure signal of 250 Hz, in order to prevent signal interference, In the embodiment, the MCU can perform frequency reduction processing by means of sliding filtering to obtain a digital pressure signal of 50 Hz. The preset time corresponds to the output frequency of the sliding filtered digital pressure signal, that is, each digital pressure signal is outputted by sliding filtering, and a comparison is performed to determine whether the pressure value corresponding to the digital pressure signal is greater than the preset standard value. When the pressure value corresponding to the digital pressure signal is greater than the preset standard value, it is determined that the current breathing state of the human body is the inhalation state, and then the corresponding operation is performed; when the pressure value corresponding to the digital pressure signal is less than or equal to the preset When the standard value is determined, the current breathing state of the human body is determined to be an exhalation state, and the inhalation trigger is not performed.

Further, referring to FIG. 4, in the fourth embodiment of the inhalation triggering control method of the present invention, in the fourth embodiment of the inhalation triggering control method of the present invention, before the step S24, the method further includes:

In step S25, it is determined whether the pressure value corresponding to the digital pressure signal after the frequency reduction in the continuous preset number comparison is greater than the preset standard value; if yes, step S24 is performed; otherwise, the inhalation trigger is not performed.

In the embodiment of the present invention, the value of the preset number of times may be set according to actual needs, and is not further limited herein. Since the increase of the duration that the pressure value corresponding to the digital pressure signal after the frequency reduction is greater than the preset standard value is determined, the false triggering is effectively prevented due to the influence of the external pressure, and thus the embodiment of the present invention can be improved. The accuracy of the trigger.

Further, referring to FIG. 5, in the fifth embodiment of the inhalation trigger control method of the present invention, the inhalation trigger control method further includes:

S50, adjust the size of the preset standard value.

In this embodiment, the preset standard value may be set in multiple levels. The larger the standard value, the lower the sensitivity to pressure detection; the lower the standard value, the higher the sensitivity to pressure detection. In this embodiment, the sensitivity of the test can be adjusted according to different test environments. For example, if the detected abdominal movement of the child is more obvious, the sensitivity may be set lower; if the detected abdominal movement of the child is weak, the sensitivity may be set higher. Therefore, by adjusting the standard values, it can be applied to different test environments, so the scope of the test can be improved.

The present invention also provides an inhalation trigger control device. Referring to FIG. 6, in an embodiment, the inhalation trigger control device provided by the present invention includes:

The first detecting module 10 is configured to detect first pressure information of the airbag preset on the object to be tested;

The respiratory trigger control device provided by the embodiment of the invention is mainly used in a measurement system for detecting a respiratory state of a living body. Specifically, the object to be tested may be a human body or an animal. In the following embodiments, the human body is taken as an example for detailed description. The airbag can be attached to the abdomen of the human body. According to the characteristics of the breathing, the abdomen is convex when inhaling, and the abdomen is recessed when exhaling, thereby changing the pressure in the airbag. It should be noted that the first pressure information in the airbag can be detected using a pressure sensor.

The processing module 20 is configured to determine a breathing state of the object to be tested according to the first pressure information and a preset standard value;

The control module 30 is configured to output an inhalation trigger control signal when the breathing state is an inhalation state.

For example, the above-described inhalation trigger control device is applied to a medical device for assisting human body breathing. Specifically, it is used to control the ventilator synchronous trigger. After the above-mentioned inhalation trigger control signal is output to the ventilator, the ventilator can perform the air supply operation by synchronously inhaling, thereby achieving the function of assisting the human body to breathe.

Further, with reference to FIG. 7 and FIG. 8 , in the second embodiment of the inhalation trigger control device of the present invention, the inhalation trigger control device further includes:

a second detecting module 40, configured to detect second pressure information of atmospheric pressure;

The above processing module 20 includes:

The acquiring unit 21 is configured to acquire a pressure difference signal corresponding to a difference between a pressure of the airbag and an atmospheric pressure according to the detected first pressure information and the second pressure information;

a voltage amplifying unit 22, configured to perform error amplification on the pressure difference signal;

The first determining unit 23 is configured to determine whether the voltage value corresponding to the amplified pressure difference signal is greater than a preset standard value;

The determining unit 24 is configured to determine that the breathing state of the object to be tested is an inhaling state when a voltage value corresponding to the amplified pressure difference signal is greater than a preset value.

Further, with reference to FIG. 9, in accordance with the second embodiment of the inhalation triggering control device of the present invention, in the third embodiment of the inhalation triggering control device of the present invention, the first determining unit 23 includes:

The signal conversion sub-unit 231 is configured to perform the second-order low-pass active filtering process on the pressure difference signal, and convert the signal into a digital pressure signal;

a frequency down subunit 232, configured to reduce a frequency of the digital pressure signal according to preset sliding filtering;

The comparison subunit 233 is configured to compare, according to the preset time period, whether the pressure value corresponding to the digital pressure signal after the frequency reduction is greater than the preset standard value; when the pressure value corresponding to the digital pressure signal is greater than the preset standard When the value is reached, the determining unit 24 is triggered to determine that the breathing state of the object to be tested is an inhalation state.

Further, referring to FIG. 10, in the fourth embodiment of the inhalation triggering control device of the present invention, the processing module 20 further includes:

The second determining unit 25 is configured to determine whether the pressure value corresponding to the digital pressure signal after the frequency reduction in the continuous preset number comparison is greater than the preset standard value; and the digital pressure after the frequency is decreased in the continuous preset number comparison When the pressure value corresponding to the signal is greater than the preset standard value, the determining unit 24 is triggered to determine that the breathing state of the object to be tested is an inhalation state.

Further, referring to FIG. 11, in the fifth embodiment of the inhalation trigger control device of the present invention, the inhalation trigger control device further includes:

The adjustment module 50 is configured to adjust the size of the preset standard value.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

An inhalation trigger control method, characterized in that the inhalation trigger control method comprises the following steps:

Detecting first pressure information of the airbag preset on the object to be tested;

Determining a breathing state of the object to be tested according to the first pressure information and a preset standard value;

When the breathing state is the inhalation state, the inhalation trigger control signal is output.
The inhalation trigger control method according to claim 1, wherein the inhalation trigger control method further comprises:

Second pressure information for detecting atmospheric pressure;

Determining, according to the first pressure information and the preset standard value, the breathing state of the object to be tested includes:

Obtaining a pressure difference signal corresponding to a difference between a pressure of the airbag and an atmospheric pressure according to the detected first pressure information and the second pressure information;

Amplifying the pressure difference signal by error;

Determining whether the voltage value corresponding to the amplified pressure difference signal is greater than a preset standard value;

When the voltage value corresponding to the amplified pressure difference signal is greater than a preset value, determining that the breathing state of the object to be tested is an inhalation state.
The inhalation trigger control method according to claim 2, wherein the determining whether the voltage value corresponding to the amplified pressure difference signal is greater than a preset standard value comprises:

Performing the second-order low-pass active filtering process on the pressure difference signal, and converting the signal into a digital pressure signal;

Decreasing the frequency of the digital pressure signal according to preset sliding filtering;

Comparing whether the pressure value corresponding to the digital pressure signal after the frequency reduction is greater than the preset standard value every preset time period; performing the determination when the pressure value corresponding to the digital pressure signal is greater than the preset standard value The breathing state of the object to be tested is a step of inhaling.
The inhalation trigger control method according to claim 3, wherein the step of determining the breathing state of the object to be tested is an inhalation state further comprises:

Determining whether the pressure value corresponding to the digital pressure signal after the frequency reduction in the continuous preset number comparison is greater than the preset standard value;

When the pressure value corresponding to the digital pressure signal after the frequency reduction in the continuous preset number comparison is greater than the preset standard value, the step of determining that the breathing state of the object to be tested is the inhalation state is performed.
The inhalation trigger control method according to any one of claims 1 to 4, wherein the inhalation trigger control method further comprises:

Adjust the size of the preset standard value.
An inhalation trigger control device, wherein the inhalation trigger control device comprises:

a first detecting module, configured to detect first pressure information of the airbag preset on the object to be tested;

a processing module, configured to determine a breathing state of the object to be tested according to the first pressure information and a preset standard value;

And a control module, configured to output an inhalation trigger control signal when the breathing state is an inhalation state.
The inspiratory trigger control device according to claim 6, wherein the inhalation trigger control device further comprises:

a second detecting module, configured to detect second pressure information of atmospheric pressure;

The processing module includes:

An acquiring unit, configured to acquire a pressure difference signal corresponding to a difference between a pressure of the airbag and an atmospheric pressure according to the detected first pressure information and the second pressure information;

a voltage amplifying unit for performing error amplification on the pressure difference signal;

a first determining unit, configured to determine whether a voltage value corresponding to the amplified pressure difference signal is greater than a preset standard value;

The determining unit is configured to determine that the breathing state of the object to be tested is an inhaling state when a voltage value corresponding to the amplified pressure difference signal is greater than a preset value.
The inhalation trigger control device according to claim 7, wherein the first determining unit comprises:

a signal conversion subunit, configured to perform the second-order low-pass active filtering process on the pressure difference signal, and convert the signal into a digital pressure signal;

a frequency down subunit for reducing a frequency of the digital pressure signal according to a preset sliding filter;

a comparison subunit, configured to compare whether the pressure value corresponding to the digital pressure signal after the frequency reduction is greater than the preset standard value every preset time period; when the pressure value corresponding to the digital pressure signal is greater than the preset standard value The determining unit is triggered to determine that the breathing state of the object to be tested is an inhalation state.
The inhalation trigger control device according to claim 8, wherein the processing module further comprises:

a second determining unit, configured to determine whether the pressure value corresponding to the digital pressure signal after decreasing the frequency in the continuous preset number comparison is greater than the preset standard value; and the digital pressure signal after decreasing the frequency in the continuous preset number comparison When the corresponding pressure value is greater than the preset standard value, the determining unit is triggered to determine that the breathing state of the object to be tested is an inhalation state.
The inhalation trigger control device according to any one of claims 6 to 9, wherein the inhalation trigger control device further comprises:

The adjustment module is used to adjust the size of the preset standard value.