WO2016202156A1 - 吸气触发控制方法及装置 - Google Patents

吸气触发控制方法及装置 Download PDF

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Publication number
WO2016202156A1
WO2016202156A1 PCT/CN2016/083462 CN2016083462W WO2016202156A1 WO 2016202156 A1 WO2016202156 A1 WO 2016202156A1 CN 2016083462 W CN2016083462 W CN 2016083462W WO 2016202156 A1 WO2016202156 A1 WO 2016202156A1
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Prior art keywords
pressure
inhalation
signal
preset
trigger control
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PCT/CN2016/083462
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English (en)
French (fr)
Inventor
邹栋
黄裕钦
吴本清
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深圳市科曼医疗设备有限公司
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Publication of WO2016202156A1 publication Critical patent/WO2016202156A1/zh

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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
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/021—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes operated by electrical means
    • A61M16/022—Control means therefor
    • A61M16/024—Control means therefor including calculation means, e.g. using a processor

Definitions

  • the present invention relates to the field of medical device technology, and in particular, to an inhalation trigger control method and apparatus.
  • 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.
  • 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 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.
  • the present invention provides an inhalation trigger control method, and the inhalation trigger control method includes the following steps:
  • the inhalation trigger control signal is output.
  • the inhalation trigger control method further includes:
  • Determining, according to the first pressure information and the preset standard value, the breathing state of the object to be tested includes:
  • the determining whether the voltage value corresponding to the amplified pressure difference signal is greater than a preset standard value comprises:
  • the breathing state of the object to be tested is a step of inhaling.
  • the step of determining that the breathing state of the object to be tested is an inhaled state further comprises:
  • 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 further includes:
  • 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
  • a control module configured to output an inhalation trigger control signal when the breathing state is an inhalation state.
  • 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.
  • 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 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.
  • the inhalation trigger control device further includes:
  • the adjustment module is used to adjust the size of the preset standard value.
  • 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;
  • 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.
  • FIG. 1 is a schematic flow chart of a first embodiment of a method for controlling an inhalation trigger according to the present invention
  • FIG. 2 is a schematic flow chart of a second embodiment of a method for controlling an inhalation trigger according to the present invention
  • FIG. 3 is a schematic flow chart of a third embodiment of an inhalation trigger control method according to the present invention.
  • FIG. 4 is a schematic flow chart of a fourth embodiment of a method for controlling an inhalation trigger according to the present invention.
  • FIG. 5 is a schematic flow chart of a fifth embodiment of a method for controlling an inhalation trigger according to the present invention.
  • FIG. 6 is a schematic diagram of functional modules of a first embodiment of an inhalation trigger control device according to the present invention.
  • FIG. 7 is a schematic diagram of functional modules of a second embodiment of the inhalation trigger control device of the present invention.
  • FIG. 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.
  • FIG. 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.
  • FIG. 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 present invention provides an inhalation trigger control method.
  • 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.
  • the object to be tested may be a human body or an animal.
  • 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
  • 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.
  • the inhalation triggering control signal may be output to control the corresponding setting to perform the corresponding operation.
  • 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.
  • 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;
  • 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.
  • the inhalation trigger control method further includes:
  • Step S40 detecting second pressure information of atmospheric pressure
  • 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.
  • the second pressure information reacts to the pressure signal of the atmospheric pressure
  • 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.
  • 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.
  • 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.
  • the circuit structure for performing second-order low-pass active filtering may be set according to actual needs.
  • 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,
  • 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.
  • 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
  • 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.
  • the method further includes:
  • 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.
  • 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.
  • the inhalation trigger control method further includes:
  • 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.
  • 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.
  • 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 is mainly used in a measurement system for detecting a respiratory state of a living body.
  • the object to be tested may be a human body or an animal.
  • 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.
  • 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.
  • the inhalation triggering control signal may be output to control the corresponding setting to perform the corresponding operation.
  • 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.
  • 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;
  • 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.
  • 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.
  • the second pressure information reacts to the pressure signal of the atmospheric pressure
  • 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.
  • 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.
  • 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.
  • the circuit structure for performing second-order low-pass active filtering may be set according to actual needs.
  • 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,
  • 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.
  • 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
  • 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.
  • 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.
  • 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.
  • the inhalation trigger control device further includes:
  • the adjustment module 50 is configured to adjust the size of the preset standard value.
  • 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.
  • 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.

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Abstract

一种吸气触发控制方法及装置。该吸气触发控制方法包括以下步骤：检测预置于待测物体上的气囊的第一压力信息（S10）；根据第一压力信息与预置的标准值确定待测物体的呼吸状态（S20）；当呼吸状态为吸气状态时，输出吸气触发控制信号（S30）。该吸气触发控制装置包括第一检测模块（10），用于检测预置于待测物体上的气囊的第一压力信息；处理模块（20），用于根据第一压力信息与预置的标准值确定待测物体的呼吸状态；控制模块（30），用于当呼吸状态为吸气状态时，输出吸气触发控制信号。该吸气触发控制方法及装置降低了呼吸检测的成本，而且能在无创呼吸机中实现可靠的吸气触发识别。

Description

吸气触发控制方法及装置
【技术领域】
本发明涉及医疗设备技术领域，尤其涉及吸气触发控制方法及装置。
【背景技术】
目前，在医疗设备中，为了实现对患者呼吸的同步检测，主要采用呼吸机的流量、压力、膈肌电吸气触发等方式。呼吸机的流量、压力吸气触发方式在有创呼吸机中采用较多，因无创呼吸机漏气的特点导致其很少被采用，另外膈肌电吸气触发中，需要经鼻把一条传感器放进胃部，传感器能够把膈膜的电子讯号传到呼吸机，由呼吸机根据该信号进行同步吸气送气，该方式的缺点在于传感器临床检测的成本较高，从而导致呼吸检测的成本较高而且临床操作复杂。
上述内容仅用于辅助理解本发明的技术方案，并不代表承认上述内容是现有技术。
【发明内容】
本发明的主要目的在于提供一种吸气触发控制方法及装置，旨在降低呼吸检测的成本较高。
为实现上述目的，本发明提供的一种吸气触发控制方法，所述吸气触发控制方法包括以下步骤：
检测预置于待测物体上的气囊的第一压力信息；
根据所述第一压力信息与预置的标准值确定所述待测物体的呼吸状态；
当所述呼吸状态为吸气状态时，输出吸气触发控制信号。
优选地，所述吸气触发控制方法还包括：
检测大气压力的第二压力信息；
所述根据所述第一压力信息与预置的标准值确定所述待测物体的呼吸状态包括：
根据检测的第一压力信息和第二压力信息，获取气囊的压力和大气压力之间的差值对应的压力差信号；
将压力差信号进行误差放大；
判断放大后的压力差信号对应的电压值是否大于预置的标准值；
当放大后的压力差信号对应的电压值大于预设值时，确定所述待测物体的呼吸状态为吸气状态。
优选地，所述判断放大后的压力差信号对应的电压值是否大于预置的标准值包括：
将所述压力差信号进行二阶低通有源滤波处理后，转换为数字压力信号；
根据预置的滑动滤波降低所述数字压力信号的频率；
每隔预置时间段比较降低频率后的数字压力信号对应的压力值是否大于所述预置的标准值；当数字压力信号对应的压力值大于所述预置的标准值时，执行所述确定所述待测物体的呼吸状态为吸气状态的步骤。
优选地，所述确定所述待测物体的呼吸状态为吸气状态的步骤之前还包括：
判断连续预置次数比较中降低频率后的数字压力信号对应的压力值是否均大于所述预置的标准值；
当连续预置次数比较中降低频率后的数字压力信号对应的压力值均大于所述预置的标准值时，执行所述确定所述待测物体的呼吸状态为吸气状态的步骤。
优选地，所述吸气触发控制方法还包括：
调整预置的标准值的大小。
此外，为实现上述目的，本发明还提供一种吸气触发控制装置，所述吸气触发控制装置包括：
第一检测模块，用于检测预置于待测物体上的气囊的第一压力信息；
处理模块，用于根据所述第一压力信息与预置的标准值确定所述待测物体的呼吸状态；
控制模块，用于当所述呼吸状态为吸气状态时，输出吸气触发控制信号。
优选地，所述吸气触发控制装置还包括：
第二检测模块，用于检测大气压力的第二压力信息；
所述处理模块包括：
获取单元，用于根据检测的第一压力信息和第二压力信息，获取气囊的压力和大气压力之间的差值对应的压力差信号；
电压放大单元，用于将压力差信号进行误差放大；
第一判断单元，用于判断放大后的压力差信号对应的电压值是否大于预置的标准值；
确定单元，用于当放大后的压力差信号对应的电压值大于预设值时，确定所述待测物体的呼吸状态为吸气状态。
优选地，所述第一判断单元包括：
信号转换子单元，用于将所述压力差信号进行二阶低通有源滤波处理后，转换为数字压力信号；
降频子单元，用于根据预置的滑动滤波降低所述数字压力信号的频率；
比较子单元，用于每隔预置时间段比较降低频率后的数字压力信号对应的压力值是否大于所述预置的标准值；当数字压力信号对应的压力值大于所述预置的标准值时，触发所述确定单元确定所述待测物体的呼吸状态为吸气状态。
优选地，所述处理模块还包括：
第二判断单元，用于判断连续预置次数比较中降低频率后的数字压力信号对应的压力值是否均大于所述预置的标准值；当连续预置次数比较中降低频率后的数字压力信号对应的压力值均大于所述预置的标准值时，触发所述确定单元确定所述待测物体的呼吸状态为吸气状态。
优选地，所述吸气触发控制装置还包括：
调整模块，用于调整预置的标准值的大小。
本发明实施例通过在待测物上预设气囊，然后检测气囊的第一压力信息，根据所述第一压力信息与预置的标准值确定所述待测物体的呼吸状态；当所述呼吸状态为吸气状态时，输出吸气触发控制信号；从而实现了吸气同步检测。由于本发明在待测物体外部检测设置在待测物体上气囊的压力，实现了吸气同步检测，相对于现有技术通过人体鼻子将传感器放进胃里进行呼吸检测，本发明降低了呼吸检测的成本。
【附图说明】
图1为本发明吸气触发控制方法第一实施例的流程示意图；
图2为本发明吸气触发控制方法第二实施例的流程示意图；
图3为本发明吸气触发控制方法第三实施例的流程示意图；
图4为本发明吸气触发控制方法第四实施例的流程示意图；
图5为本发明吸气触发控制方法第五实施例的流程示意图；
图6为本发明吸气触发控制装置第一实施例的功能模块示意图；
图7为本发明吸气触发控制装置第二实施例的功能模块示意图；
图8为本发明吸气触发控制装置第二实施例中处理模块的细化功能模块示意图；
图9为本发明吸气触发控制装置第三实施例中第一判断单元的细化功能模块示意图；
图10为本发明吸气触发控制装置第四实施例中处理模块的细化功能模块示意图；
图11为本发明吸气触发控制装置第五实施例的功能模块示意图。
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
【具体实施方式】
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
本发明提供一种吸气触发控制方法，参照图1，在本发明吸气触发控制方法第一实施例中，该吸气触发控制方法以下步骤：
步骤S10，检测预置于待测物体上的气囊的第一压力信息；
本发明实施例提供的呼吸触发控制方法主要应用于测量***中，用于对活体的呼吸状态进行检测。具体地，上述待测物可以为人体也可以为动物，以下各实施例中以人体为例作出详细说明。上述气囊可以贴附于人体的腹部，根据呼吸的特点，当吸气时腹部凸起，呼气时腹部凹下，从而改变上述气囊内的压力。应当说明的是，该气囊内的第一压力信息可以采用压力传感器进行检测。
步骤S20，根据所述第一压力信息与预置的标准值确定所述待测物体的呼吸状态；
步骤S30，当所述呼吸状态为吸气状态时，输出吸气触发控制信号。
上述预置的标准值的大小可以根据实际需要进行设置，在此不作进一步地限定。具体地，该标准值可以采用等级的形式进行设置，以反应对不同灵敏度的压力检测。由于在人体吸气时，腹部凸起，从而挤压上述气囊，使得气囊内的压力增大。上述第一压力信息为电信号，气压越大，对应的电信号的电压值越高。当该电压值大于上述预置的标准值时，则认定人体当前的呼吸状态为吸气状态，此时则可以输出吸气触发控制信号，以控制相应的设置执行对应的操作。
例如，将上述吸气触发控制方法应用于医疗设备中，用于辅助人体呼吸。具体地，用于控制呼吸机同步触发。当输出上述吸气触发控制信号至呼吸机后，可以由呼吸机同步吸气进行送气操作，从而达到辅助人体呼吸的作用。
本发明实施例通过在待测物上预设气囊，然后检测气囊的第一压力信息，根据所述第一压力信息与预置的标准值确定所述待测物体的呼吸状态；当所述呼吸状态为吸气状态时，输出吸气触发控制信号；从而实现了吸气同步检测。由于本发明在待测物体外部检测设置在待测物体上气囊的压力，实现了吸气同步检测，相对于现有技术通过人体鼻子将传感器放进胃里进行呼吸检测，本发明降低了呼吸检测的成本。
进一步地，参照图2，基于本发明吸气触发控制方法第一实施例，在本发明吸气触发控制方法第二实施例中，该吸气触发控制方法还包括：
步骤S40，检测大气压力的第二压力信息；
上述步骤S20包括：
步骤S21，根据检测的第一压力信息和第二压力信息，获取气囊的压力和大气压力之间的差值对应的压力差信号；
步骤S22，将压力差信号进行误差放大；
步骤S23，判断放大后的压力差信号对应的电压值是否大于预置的标准值；若是，则执行步骤S24，否则不进行吸气触发；
步骤S24，确定所述待测物体的呼吸状态为吸气状态。
本发明实施例中上述第二压力信息反应大气压的压力信号，具体地，可以采用差压型压力传感，该差压型压力传感的一端口通过一连接管与气囊连通，且气囊、连接管和传感器形成密闭空间；该差压型压力传感的另一端口直接对空，从而使得气囊内压力的变化均为相对于大气压力的变化，以规避大气压的变化对气囊压力信号的影响。该差压型压力传感的输出端将输出气囊内压力于大气压力之间差值的压力差信号。由于人体在呼吸时，对气囊的压力值变化较小，从而使得上述压力差信号微弱，可以通过预置的运算放大电路将该压力差信号进行放大预设倍（例如为400倍）。此外，为了考虑压力传感器零漂的影响，在上述运算放大电路中采用0.6V作为参考电压。将放大后的电压值于预置的标准值进行比较后确定人体是否为吸气状态，当该电压值大于预置的标准值时，则确定当前检测到人体的呼吸状态为吸气状态。
进一步地，参照图3，基于本发明吸气触发控制方法第二实施例，在本发明吸气触发控制方法第三实施例中，上述步骤S23包括：
步骤S231，将所述压力差信号进行二阶低通有源滤波处理后，转换为数字压力信号；
步骤S232，根据预置的滑动滤波降低所述数字压力信号的频率；
步骤S233，每隔预置时间段比较降低频率后的数字压力信号对应的压力值是否大于所述预置的标准值；若是，则执行步骤S24，否则不进行吸气触发。
本实施例中，进行二阶低通有源滤波的电路结构可以根据根据实际需要进行设置。在上述压力差信号进行二阶低通有源滤波处理后，通过ADC转换器将模拟信号转换为数字信号，由于现有ADC转换器输出频率通常为250Hz的数字压力信号，为了防止信号干扰，本实施例中可以通过MCU通过滑动滤波的方式进行降频处理得到50Hz的数字压力信号。上述预置时间与滑动滤波后的数字压力信号输出频率对应，即通过滑动滤波每输出一次数字压力信号，将进行一次比较，确定数字压力信号对应的压力值是否大于所述预置的标准值。当数字压力信号对应的压力值大于所述预置的标准值时，则认定人体当前的呼吸状态为吸气状态，然后执行相应的操作；当数字压力信号对应的压力值小于等于所述预置的标准值时，则认定人体当前的呼吸状态为呼气状态，则不进行吸气触发。
进一步地，参照图4，基于本发明吸气触发控制方法第三实施例，在本发明吸气触发控制方法第四实施例中，上述步骤S24之前还包括：
步骤S25，判断连续预置次数比较中降低频率后的数字压力信号对应的压力值是否均大于所述预置的标准值；若是，则执行步骤S24，否则不进行吸气触发。
本发明实施例中，上述预置次数的值可以根据实际需要进行设置，在此不做进一步地限定。由于增加了对降低频率后的数字压力信号对应的压力值大于所述预置的标准值的持续时间进行了判断，有效防止了由于外部压力影响，进行了误触发，因此本发明实施例可以提高触发的准确度。
进一步地，参照图5，基于本发明吸气触发控制方法任一实施例，在本发明吸气触发控制方法第五实施例中，上述吸气触发控制方法还包括：
S50，调整预置的标准值的大小。
本实施例中，上述预置的标准值可以采用多等级设置，标准值越大，对压力检测的灵敏度越低；标准值越低，对压力检测的灵敏度越高。在本实施例中可以根据不同的测试环境调整测试的灵敏度。例如，检测的患儿腹部运动较明显的，可以设置灵敏度较低；检测的患儿腹部运动较微弱则可以设置灵敏度较高。因此通过对标准值进行调整，可以适用于不同的测试环境，因此可以提高测试的范围。
本发明还提供一种吸气触发控制装置，参照图6，在一实施例中，本发明提供的吸气触发控制装置包括：
第一检测模块10，用于检测预置于待测物体上的气囊的第一压力信息；
本发明实施例提供的呼吸触发控制装置主要应用于测量***中，用于对活体的呼吸状态进行检测。具体地，上述待测物可以为人体也可以为动物，以下各实施例中以人体为例作出详细说明。上述气囊可以贴附于人体的腹部，根据呼吸的特点，当吸气时腹部凸起，呼气时腹部凹下，从而改变上述气囊内的压力。应当说明的是，该气囊内的第一压力信息可以采用压力传感器进行检测。
处理模块20，用于根据所述第一压力信息与预置的标准值确定所述待测物体的呼吸状态；
控制模块30，用于当所述呼吸状态为吸气状态时，输出吸气触发控制信号。
上述预置的标准值的大小可以根据实际需要进行设置，在此不作进一步地限定。具体地，该标准值可以采用等级的形式进行设置，以反应对不同灵敏度的压力检测。由于在人体吸气时，腹部凸起，从而挤压上述气囊，使得气囊内的压力增大。上述第一压力信息为电信号，气压越大，对应的电信号的电压值越高。当该电压值大于上述预置的标准值时，则认定人体当前的呼吸状态为吸气状态，此时则可以输出吸气触发控制信号，以控制相应的设置执行对应的操作。
例如，将上述吸气触发控制装置应用于医疗设备中，用于辅助人体呼吸。具体地，用于控制呼吸机同步触发。当输出上述吸气触发控制信号至呼吸机后，可以由呼吸机同步吸气进行送气操作，从而达到辅助人体呼吸的作用。
本发明实施例通过在待测物上预设气囊，然后检测气囊的第一压力信息，根据所述第一压力信息与预置的标准值确定所述待测物体的呼吸状态；当所述呼吸状态为吸气状态时，输出吸气触发控制信号；从而实现了吸气同步检测。由于本发明在待测物体外部检测设置在待测物体上气囊的压力，实现了吸气同步检测，相对于现有技术通过人体鼻子将传感器放进胃里进行呼吸检测，本发明降低了呼吸检测的成本。
进一步地，结合参照图7和图8，基于本发明吸气触发控制装置第一实施例，在本发明吸气触发控制装置第二实施例中，上述吸气触发控制装置还包括：
第二检测模块40，用于检测大气压力的第二压力信息；
上述处理模块20包括：
获取单元21，用于根据检测的第一压力信息和第二压力信息，获取气囊的压力和大气压力之间的差值对应的压力差信号；
电压放大单元22，用于将压力差信号进行误差放大；
第一判断单元23，用于判断放大后的压力差信号对应的电压值是否大于预置的标准值；
确定单元24，用于当放大后的压力差信号对应的电压值大于预设值时，确定所述待测物体的呼吸状态为吸气状态。
本发明实施例中上述第二压力信息反应大气压的压力信号，具体地，可以采用差压型压力传感，该差压型压力传感的一端口通过一连接管与气囊连通，且气囊、连接管和传感器形成密闭空间；该差压型压力传感的另一端口直接对空，从而使得气囊内压力的变化均为相对于大气压力的变化，以规避大气压的变化对气囊压力信号的影响。该差压型压力传感的输出端将输出气囊内压力于大气压力之间差值的压力差信号。由于人体在呼吸时，对气囊的压力值变化较小，从而使得上述压力差信号微弱，可以通过预置的运算放大电路将该压力差信号进行放大预设倍（例如为400倍）。此外，为了考虑压力传感器零漂的影响，在上述运算放大电路中采用0.6V作为参考电压。将放大后的电压值于预置的标准值进行比较后确定人体是否为吸气状态，当该电压值大于预置的标准值时，则确定当前检测到人体的呼吸状态为吸气状态。
进一步地，结合参照图9，基于本发明吸气触发控制装置第二实施例，在本发明吸气触发控制装置第三实施例中，上述第一判断单元23包括：
信号转换子单元231，用于将所述压力差信号进行二阶低通有源滤波处理后，转换为数字压力信号；
降频子单元232，用于根据预置的滑动滤波降低所述数字压力信号的频率；
比较子单元233，用于每隔预置时间段比较降低频率后的数字压力信号对应的压力值是否大于所述预置的标准值；当数字压力信号对应的压力值大于所述预置的标准值时，触发所述确定单元24确定所述待测物体的呼吸状态为吸气状态。
本实施例中，进行二阶低通有源滤波的电路结构可以根据根据实际需要进行设置。在上述压力差信号进行二阶低通有源滤波处理后，通过ADC转换器将模拟信号转换为数字信号，由于现有ADC转换器输出频率通常为250Hz的数字压力信号，为了防止信号干扰，本实施例中可以通过MCU通过滑动滤波的方式进行降频处理得到50Hz的数字压力信号。上述预置时间与滑动滤波后的数字压力信号输出频率对应，即通过滑动滤波每输出一次数字压力信号，将进行一次比较，确定数字压力信号对应的压力值是否大于所述预置的标准值。当数字压力信号对应的压力值大于所述预置的标准值时，则认定人体当前的呼吸状态为吸气状态，然后执行相应的操作；当数字压力信号对应的压力值小于等于所述预置的标准值时，则认定人体当前的呼吸状态为呼气状态，则不进行吸气触发。
进一步地，参照图10，基于本发明吸气触发控制装置第三实施例，在本发明吸气触发控制装置第四实施例中，处理模块20还包括：
第二判断单元25，用于判断连续预置次数比较中降低频率后的数字压力信号对应的压力值是否均大于所述预置的标准值；当连续预置次数比较中降低频率后的数字压力信号对应的压力值均大于所述预置的标准值时，触发所述确定单元24确定所述待测物体的呼吸状态为吸气状态。
本发明实施例中，上述预置次数的值可以根据实际需要进行设置，在此不做进一步地限定。由于增加了对降低频率后的数字压力信号对应的压力值大于所述预置的标准值的持续时间进行了判断，有效防止了由于外部压力影响，进行了误触发，因此本发明实施例可以提高触发的准确度。
进一步地，参照图11，基于本发明吸气触发控制装置任一实施例，在本发明吸气触发控制装置第五实施例中，上述吸气触发控制装置还包括：
调整模块50，用于调整预置的标准值的大小。
本实施例中，上述预置的标准值可以采用多等级设置，标准值越大，对压力检测的灵敏度越低；标准值越低，对压力检测的灵敏度越高。在本实施例中可以根据不同的测试环境调整测试的灵敏度。例如，检测的患儿腹部运动较明显的，可以设置灵敏度较低；检测的患儿腹部运动较微弱则可以设置灵敏度较高。因此通过对标准值进行调整，可以适用于不同的测试环境，因此可以提高测试的范围。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (10)

  1. 一种吸气触发控制方法，其特征在于，所述吸气触发控制方法包括以下步骤：
    检测预置于待测物体上的气囊的第一压力信息；
    根据所述第一压力信息与预置的标准值确定所述待测物体的呼吸状态；
    当所述呼吸状态为吸气状态时，输出吸气触发控制信号。
  2. 如权利要求1所述的吸气触发控制方法，其特征在于，所述吸气触发控制方法还包括：
    检测大气压力的第二压力信息；
    所述根据所述第一压力信息与预置的标准值确定所述待测物体的呼吸状态包括：
    根据检测的第一压力信息和第二压力信息，获取气囊的压力和大气压力之间的差值对应的压力差信号；
    将压力差信号进行误差放大；
    判断放大后的压力差信号对应的电压值是否大于预置的标准值；
    当放大后的压力差信号对应的电压值大于预设值时，确定所述待测物体的呼吸状态为吸气状态。
  3. 如权利要求2所述的吸气触发控制方法，其特征在于，所述判断放大后的压力差信号对应的电压值是否大于预置的标准值包括：
    将所述压力差信号进行二阶低通有源滤波处理后，转换为数字压力信号；
    根据预置的滑动滤波降低所述数字压力信号的频率；
    每隔预置时间段比较降低频率后的数字压力信号对应的压力值是否大于所述预置的标准值；当数字压力信号对应的压力值大于所述预置的标准值时，执行所述确定所述待测物体的呼吸状态为吸气状态的步骤。
  4. 如权利要求3所述的吸气触发控制方法，其特征在于，所述确定所述待测物体的呼吸状态为吸气状态的步骤之前还包括：
    判断连续预置次数比较中降低频率后的数字压力信号对应的压力值是否均大于所述预置的标准值；
    当连续预置次数比较中降低频率后的数字压力信号对应的压力值均大于所述预置的标准值时，执行所述确定所述待测物体的呼吸状态为吸气状态的步骤。
  5. 如权利要求1至4中任一项所述的吸气触发控制方法，其特征在于，所述吸气触发控制方法还包括：
    调整预置的标准值的大小。
  6. 一种吸气触发控制装置，其特征在于，所述吸气触发控制装置包括：
    第一检测模块，用于检测预置于待测物体上的气囊的第一压力信息；
    处理模块，用于根据所述第一压力信息与预置的标准值确定所述待测物体的呼吸状态；
    控制模块，用于当所述呼吸状态为吸气状态时，输出吸气触发控制信号。
  7. 如权利要求6所述的吸气触发控制装置，其特征在于，所述吸气触发控制装置还包括：
    第二检测模块，用于检测大气压力的第二压力信息；
    所述处理模块包括：
    获取单元，用于根据检测的第一压力信息和第二压力信息，获取气囊的压力和大气压力之间的差值对应的压力差信号；
    电压放大单元，用于将压力差信号进行误差放大；
    第一判断单元，用于判断放大后的压力差信号对应的电压值是否大于预置的标准值；
    确定单元，用于当放大后的压力差信号对应的电压值大于预设值时，确定所述待测物体的呼吸状态为吸气状态。
  8. 如权利要求7所述的吸气触发控制装置，其特征在于，所述第一判断单元包括：
    信号转换子单元，用于将所述压力差信号进行二阶低通有源滤波处理后，转换为数字压力信号；
    降频子单元，用于根据预置的滑动滤波降低所述数字压力信号的频率；
    比较子单元，用于每隔预置时间段比较降低频率后的数字压力信号对应的压力值是否大于所述预置的标准值；当数字压力信号对应的压力值大于所述预置的标准值时，触发所述确定单元确定所述待测物体的呼吸状态为吸气状态。
  9. 如权利要求8所述的吸气触发控制装置，其特征在于，所述处理模块还包括：
    第二判断单元，用于判断连续预置次数比较中降低频率后的数字压力信号对应的压力值是否均大于所述预置的标准值；当连续预置次数比较中降低频率后的数字压力信号对应的压力值均大于所述预置的标准值时，触发所述确定单元确定所述待测物体的呼吸状态为吸气状态。
  10. 如权利要求6至9中任一项所述的吸气触发控制装置，其特征在于，所述吸气触发控制装置还包括：
    调整模块，用于调整预置的标准值的大小。
PCT/CN2016/083462 2015-06-19 2016-05-26 吸气触发控制方法及装置 WO2016202156A1 (zh)

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