WO2012089092A1 - Method and device for controlling gas ratio of breathing machine - Google Patents

Method and device for controlling gas ratio of breathing machine Download PDF

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Publication number
WO2012089092A1
WO2012089092A1 PCT/CN2011/084698 CN2011084698W WO2012089092A1 WO 2012089092 A1 WO2012089092 A1 WO 2012089092A1 CN 2011084698 W CN2011084698 W CN 2011084698W WO 2012089092 A1 WO2012089092 A1 WO 2012089092A1
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WO
WIPO (PCT)
Prior art keywords
oxygen
proportional valve
oxygen concentration
concentration value
control
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PCT/CN2011/084698
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French (fr)
Chinese (zh)
Inventor
金文贤
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北京谊安医疗系统股份有限公司
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Application filed by 北京谊安医疗系统股份有限公司 filed Critical 北京谊安医疗系统股份有限公司
Priority to BR112012032964A priority Critical patent/BR112012032964A2/en
Publication of WO2012089092A1 publication Critical patent/WO2012089092A1/en

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Classifications

    • 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
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/12—Preparation of respiratory gases or vapours by mixing different gases
    • 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
    • A61M16/20—Valves specially adapted to medical respiratory devices
    • A61M16/201—Controlled valves
    • A61M16/202—Controlled valves electrically actuated
    • A61M16/203—Proportional
    • 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
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/1005—Preparation of respiratory gases or vapours with O2 features or with parameter measurement
    • A61M2016/102—Measuring a parameter of the content of the delivered gas
    • A61M2016/1025—Measuring a parameter of the content of the delivered gas the O2 concentration
    • 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
    • A61M2202/00—Special media to be introduced, removed or treated
    • A61M2202/02—Gases
    • A61M2202/0208—Oxygen

Definitions

  • the present invention relates to the field of medical devices, and relates to a ventilator gas ratio control method and apparatus.
  • a ventilator needs to provide an air with adjustable oxygen concentration according to user needs.
  • a pneumatic electronically controlled ventilator realized by a dual proportional valve, if mixing oxygen is required, two proportional valves need to be opened at the same time, and two proportional valves are required.
  • the opening size and opening time directly affect the oxygen concentration of the output gas. Since the opening and flow rate curves of the proportional valve are changed by the pressure of the air supply, the gas oxygen concentration control given by the double proportional valve ventilation will shift.
  • the minimum flow rate that the proportional valve can give is determined by the proportional valve.
  • the object of the present invention is to provide a ventilator gas ratio control method and apparatus for monitoring the oxygen concentration of a given gas in real time, and performing double closed loop control on the oxygen concentration to give a given gas oxygen concentration and a set oxygen concentration.
  • a ventilator gas ratio control method comprising: a: obtaining an air proportional valve of the ventilator and The relationship between the opening degree of the oxygen proportional valve and the flow rate; b: controlling the air proportional valve and the oxygen proportional valve according to the relationship between the opening degree and the flow rate and the preset oxygen concentration value; and C: according to the current oxygen concentration value and the The air ratio valve and the oxygen proportional valve are finely adjusted by a preset oxygen concentration value.
  • the step a includes: verifying the air proportional valve and the oxygen proportional valve to determine an opening degree and a flow rate relationship of the air proportional valve and the oxygen proportional valve. Further, before the step b is performed, the control method further includes: comparing the current oxygen concentration value with the preset oxygen concentration value to determine whether the mixed oxygen control is required, and if yes, performing step 1). Further, the determining whether the hybrid oxygen control is required comprises: the ventilator monitoring the output air volume and the oxygen amount in real time, and calculating the current oxygen concentration value.
  • the control method further includes: determining whether the current control state of the ventilator is capacity control, and if yes, performing step 0. Further, after performing step c, the control method further includes: determining, according to the adjusted oxygen concentration value and the preset oxygen concentration value, whether the mixed oxygen control is up to standard, and if yes, the gas proportional control ends. If not, coarsely adjust the air proportional valve and the oxygen proportional valve, then return to step c.
  • a ventilator gas proportional control device includes: an acquisition module: configured to acquire an opening degree flow rate relationship between an air proportional valve and an oxygen proportional valve of the ventilator; and a control module: a relationship between the opening degree and the flow rate and a preset oxygen concentration value to control the air proportional valve and the oxygen proportional valve; and a fine adjustment module: for using the current oxygen concentration value and the preset oxygen concentration value Adjust the air proportional valve and the oxygen proportional valve.
  • the obtaining module comprises: a calibration module: verifying the air proportional valve and the oxygen proportional valve to determine a relationship between an opening degree and a flow rate of the air proportional valve and the oxygen proportional valve.
  • control module includes: a first determining module, configured to determine, according to the preset oxygen concentration value, whether hybrid oxygen control is required.
  • first determining module includes: a monitoring module, configured to monitor, in real time, the amount of air and oxygen output by the ventilator, and calculate a current oxygen concentration value; and a calculation module, configured to calculate a current oxygen concentration value.
  • fine adjustment module includes: a second determining module, configured to determine whether the current control state of the ventilator is capacity control.
  • FIG. 1 is a main flow chart of a ventilator gas proportional control method according to the present invention
  • FIG. 2 is a graph showing a relationship between an opening degree and a flow rate of an air proportional valve and an oxygen proportional valve according to the present invention
  • 3 is a detailed flow chart of a ventilator gas proportional control method according to the present invention
  • FIG. 4 is a schematic structural view of a ventilator gas proportional control device according to the present invention.
  • a ventilator gas ratio control method includes: a: obtaining an air proportional valve and an oxygen ratio of the ventilator The relationship between the opening degree of the valve and the flow rate; b: controlling the air proportional valve and the oxygen proportional valve according to the relationship between the opening degree and the flow rate and the preset oxygen concentration value; and c: according to the current oxygen concentration value and the preset The oxygen concentration value fine-tunes the air proportional valve and the oxygen proportional valve.
  • the relationship between the opening degree and the flow rate of the air proportional valve and the oxygen proportional valve of the ventilator is obtained by verifying the air proportional valve and the oxygen proportional valve, as shown in FIG. 2, FIG.
  • FIG. 3 is a specific flowchart of a method for controlling the gas ratio of the ventilator according to the present invention.
  • the standard is the preset oxygen concentration value.
  • 4 is a ventilator gas proportional control device implementing the above method. Referring to FIG. 4
  • a ventilator gas proportional control device includes: an acquisition module 401: an air proportional valve and an oxygen proportional valve for acquiring the ventilator The opening degree flow rate relationship; the control module 403: configured to control the air proportional valve and the oxygen proportional valve according to the relationship between the opening degree and the flow rate and the preset oxygen concentration value; and the fine adjustment module 405: for using the current oxygen concentration value And adjusting the air proportional valve and the oxygen proportional valve with the preset oxygen concentration value.
  • the obtaining module comprises: a calibration module (not shown): the air proportional valve and the oxygen proportional valve are verified to determine the relationship between the opening degree and the flow rate of the air proportional valve and the oxygen proportional valve.
  • control module includes: a first determining module (not shown) for determining whether the mixed oxygen control is required according to the preset oxygen concentration value.
  • first determining module includes: a monitoring module (not shown), configured to monitor, in real time, the amount of air and oxygen output by the ventilator, and calculate a current oxygen concentration value; and a calculation module, configured to calculate Current oxygen concentration value.
  • fine adjustment module includes: a second determining module (not shown) for determining whether the current control state of the ventilator is capacity control.
  • the technical solution of the present invention is used for real-time monitoring of the oxygen concentration of the given gas, and the double closed-loop control of the oxygen concentration, so that the given gas oxygen concentration is consistent with the set oxygen concentration, and the mixing is improved.
  • the accuracy of oxygen control is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Where is the spirit and principle of the present invention Any modifications, equivalent substitutions, improvements, etc. made therein are intended to be included within the scope of the present invention.

Abstract

A method and a device for controlling the gas ratio of a breathing machine. The method comprises: a: acquiring an opening-flow rate relationship of an air ratio valve and an oxygen ratio valve of the breathing machine; b: controlling the air ratio valve and the oxygen ratio valve according to the opening-flow rate relationships and a preset oxygen concentration value; and c: fine-tuning the air ratio valve and the oxygen ratio valve according to a current oxygen concentration value and the preset oxygen concentration value. The control device comprises: an acquisition module (401), configured to acquire the opening-flow rate relationship of an air ratio valve and an oxygen ratio valve of the breathing machine; a control module (403), configured to control the air ratio valve and the oxygen ratio valve; and a fine-tuning module (405), configured to fine-tune the air ratio valve and the oxygen ratio valve. Through the method and the device, the oxygen concentration of the gas can be monitored in real time, so as to perform double loop control on the oxygen concentration, so that the oxygen concentration of the provided gas is the same as the set oxygen concentration, thereby improving the accuracy of oxygen mixture control.

Description

一种呼吸机气体比例控制方法及装置  Ventilator gas ratio control method and device
技术领域 本发明属于医疗设备领域， 涉及一种呼吸机气体比例控制方法及装置。 背景技术 呼吸机需要根据用户需要， 提供一种氧浓度可调的空气， 对于双比例阀实 现的气动电控呼吸机， 如果需要进行混氧， 需要同时打开两个比例阀， 而两个 比例阀的开度大小及打开的时间直接影响输出气体的氧浓度。 由于比例阀的开 度和流速曲线受气源压力发生变化， 釆用双比例阀通气给出的气体氧浓度控制 就会发生偏移， 此外， 比例阀能够给出的最小流速是由比例阀的自身特性决定 的， 当比例阀不能给出需要的流速， 釆用双比例阀通气给出的气体的氧浓度控 制就会发生偏移。 现有技术中， 氧浓度监测一般釆用氧浓度传感器进行监测， 而氧浓度传感器会发生漂移， 需要经常对传感器进行校准， 否则， 监测就会发 生偏差， 影响了临床使用效果， 甚至误导操作者。 现有技术中， 对于上述氧浓度发生偏移的问题， 尚未给出有效的解决方案。 发明内容 本发明的目的提出一种呼吸机气体比例控制方法及装置， 用于实时监测给 出的气体的氧浓度， 对氧浓度进行双闭环控制， 使给出的气体氧浓度与设定的 氧浓度一致， 提高了混氧控制的精度。 为了实现上述目的， 本发明釆用以下技术方案实现： 一种呼吸机气体比例控制方法， 包括： a: 获取所述呼吸机的空气比例阀和 氧气比例阀的开度与流速的关系； b: 根据所述开度与流速的关系以及预设氧浓 度值控制所述空气比例阀和氧气比例阀； 以及 C:根据当前氧浓度值和所述预设 氧浓度值微调所述空气比例阀和氧气比例阀。 进一步地， 所述步骤 a 包括： 校验所述空气比例阀和氧气比例阀， 以确定 所述空气比例阀和氧气比例阀的开度和流速关系。 进一步地， 在执行步骤 b之前， 所述控制方法还包括： 比较当前氧浓度值 与预设氧浓度值， 判断是否需要进行混氧控制， 若是， 执行步骤1)。 进一步地， 所述判断是否需要进行混氧控制包括： 所述呼吸机实时监测输 出的空气量和 氧气量， 并计算所述当前氧浓度值。 进一步地， 所述计算当前氧浓度值包括： 根据以下公式计算得出： 当前氧 浓度值 = [(空气量 X k)+氧气量 )]/(空气量 +氧气量)， 其中 k为空气中氧气含量比 例。 进一步地， 在执行步骤 c之前， 所述控制方法还包括， 判断所述呼吸机当 前的控制状态是否是容量控制， 若是， 执行步骤0。 进一步地， 在执行步骤 c之后， 所述控制方法还包括： 根据微调后的氧浓 度值和所述预设氧浓度值， 判断所述混氧控制是否达标， 若是， 所述气体比例 控制结束， 若否， 粗调所述空气比例阀和氧气比例阀， 然后返回步骤 c。 根据本发明的另外一个方面， 一种呼吸机气体比例控制装置， 包括： 获取 模块： 用于获取所述呼吸机的空气比例阀和氧气比例阀的开度流速关系； 控制 模块： 用于根据所述开度与流速的关系以及预设氧浓度值控制所述空气比例阀 和氧气比例阀； 以及微调模块： 用于根据当前氧浓度值和所述预设氧浓度值微 调所述空气比例阀和氧气比例阀。 进一步地， 所述获取模块包括： 校验模块： 校验所述空气比例阀和氧气比 例阀， 以确定所述空气比例阀和氧气比例阀的开度与流速的关系。 进一步地， 所述控制模块包括： 第一判断模块， 用于根据所述预设氧浓度 值， 判断是否需要进行混氧控制。 进一步地， 所述第一判断模块包括： 监测模块， 用于所述呼吸机实时监测 输出的空气量和氧气量， 并计算当前氧浓度值； 以及计算模块， 用于计算当前 的氧浓度值。 进一步地， 所述微调模块包括： 第二判断模块， 用于判断所述呼吸机当前 的控制状态是否是容量控制。 与现有技术相比， 本发明的有益效果是： 该技术方案用于实时监测给出的 气体的氧浓度， 对氧浓度进行双闭环控制， 使给出的气体氧浓度与设定的氧浓 度一致， 提高了混氧控制的精度。 附图说明 此处所说明的附图用来提供对本发明型的进一步理解， 构成本申请的一部 分， 本发明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的不 当限定。 在附图中： 图 1是根据本发明所述一种呼吸机气体比例控制方法的主要流程图； 图 2是根据本发明所述空气比例阀和氧气比例阀的开度和流速关系的曲线 图； 图 3是根据本发明所述一种呼吸机气体比例控制方法的具体流程图； 图 4是根据本发明所述一种呼吸机气体比例控制装置的结构示意图； 具体实施方式 需要说明的是， 在不冲突的情况下， 本申请中的实施例及实施例中的特征 可以相互组合。 下面将参考附图并结合实施例来详细说明本发明。 本发明针对氧浓度临床监测会发生偏差问题， 提出， 具体介绍一种呼吸机 气体比例控制方法和装置。 图 1是根据本发明所述一种呼吸机气体比例控制方法的主要流程图， 参见 图 1 , 一种呼吸机气体比例控制方法， 包括： a: 获取所述呼吸机的空气比例阀 和氧气比例阀的开度与流速的关系； b: 根据所述开度与流速的关系以及预设氧 浓度值控制所述空气比例阀和氧气比例阀； 以及 c:根据当前氧浓度值和所述预 设氧浓度值微调所述空气比例阀和氧气比例阀。 具体的， 获取所述呼吸机的空气比例阀和氧气比例阀的开度与流速的关系 是通过对所述空气比例阀和氧气比例阀的校验得到的， 参见图 2所示， 图 2是 根据本发明所述空气比例阀和氧气比例阀的开度和流速关系的曲线图。 从图 2 可以看出所述呼吸机的空气比例阀和氧气比例阀的开度与流速的关系。 在进行 混氧控制之前， 先对是否需要进行混氧控制做出判断， 参见图 3所示， 图 3是 根据本发明所述一种呼吸机气体比例控制方法的具体流程图； 且上述判断的标 准是预设的氧浓度值， 当判断的结果为是的时候， 再进行容量控制的判断， 如 果是压力控制， 进入实时调节， 若是容量控制， 则对本周期的空气和氧气进行 微调， 微调后， 对所述混氧控制的达标情况进行判断， 在不满足预设氧浓度值 时， 再对所述空气比例阀和氧气比例阀进行粗调， 且回到微调之前的步骤。 图 4是实现上述方法的呼吸机气体比例控制装置， 参见图 4所示， 一种呼 吸机气体比例控制装置， 包括： 获取模块 401 : 用于获取所述呼吸机的空气比 例阀和氧气比例阀的开度流速关系； 控制模块 403 : 用于根据所述开度与流速 的关系以及预设氧浓度值控制所述空气比例阀和氧气比例阀； 以及微调模块 405:用于根据当前氧浓度值和所述预设氧浓度值微调所述空气比例阀和氧气比 例阀。 进一步地， 所述获取模块包括： 校验模块 (图中未示)： 校验所述空气比例阀 和氧气比例阀， 以确定所述空气比例阀和氧气比例阀的开度与流速的关系。 进一步地， 所述控制模块包括： 第一判断模块 (图中未示)， 用于根据所述预 设氧浓度值， 判断是否需要进行混氧控制。 进一步地， 所述第一判断模块包括： 监测模块 (图中未示)， 用于所述呼吸机 实时监测输出的空气量和氧气量， 并计算当前氧浓度值； 以及计算模块， 用于 计算当前的氧浓度值。 进一步地， 所述微调模块包括： 第二判断模块 (图中未示)， 用于判断所述呼 吸机当前的控制状态是否是容量控制。 通过上述实施例， 可以看出本发明技术方案用于实时监测给出的气体的氧 浓度， 对氧浓度进行双闭环控制， 使给出的气体氧浓度与设定的氧浓度一致， 提高了混氧控制的精度。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本领 域的技术人员 来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则 之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之 内。 TECHNICAL FIELD The present invention relates to the field of medical devices, and relates to a ventilator gas ratio control method and apparatus. BACKGROUND OF THE INVENTION A ventilator needs to provide an air with adjustable oxygen concentration according to user needs. For a pneumatic electronically controlled ventilator realized by a dual proportional valve, if mixing oxygen is required, two proportional valves need to be opened at the same time, and two proportional valves are required. The opening size and opening time directly affect the oxygen concentration of the output gas. Since the opening and flow rate curves of the proportional valve are changed by the pressure of the air supply, the gas oxygen concentration control given by the double proportional valve ventilation will shift. In addition, the minimum flow rate that the proportional valve can give is determined by the proportional valve. According to its own characteristics, when the proportional valve can not give the required flow rate, the oxygen concentration control of the gas given by the double proportional valve ventilation will shift. In the prior art, the oxygen concentration monitoring is generally monitored by an oxygen concentration sensor, and the oxygen concentration sensor is drifted, and the sensor needs to be calibrated frequently. Otherwise, the monitoring will be biased, affecting the clinical use effect, and even misleading the operator. . In the prior art, an effective solution has not been given for the problem that the above oxygen concentration shifts. SUMMARY OF THE INVENTION The object of the present invention is to provide a ventilator gas ratio control method and apparatus for monitoring the oxygen concentration of a given gas in real time, and performing double closed loop control on the oxygen concentration to give a given gas oxygen concentration and a set oxygen concentration. The concentration is consistent, which improves the accuracy of the mixed oxygen control. In order to achieve the above object, the present invention is achieved by the following technical solutions: A ventilator gas ratio control method, comprising: a: obtaining an air proportional valve of the ventilator and The relationship between the opening degree of the oxygen proportional valve and the flow rate; b: controlling the air proportional valve and the oxygen proportional valve according to the relationship between the opening degree and the flow rate and the preset oxygen concentration value; and C: according to the current oxygen concentration value and the The air ratio valve and the oxygen proportional valve are finely adjusted by a preset oxygen concentration value. Further, the step a includes: verifying the air proportional valve and the oxygen proportional valve to determine an opening degree and a flow rate relationship of the air proportional valve and the oxygen proportional valve. Further, before the step b is performed, the control method further includes: comparing the current oxygen concentration value with the preset oxygen concentration value to determine whether the mixed oxygen control is required, and if yes, performing step 1). Further, the determining whether the hybrid oxygen control is required comprises: the ventilator monitoring the output air volume and the oxygen amount in real time, and calculating the current oxygen concentration value. Further, the calculating the current oxygen concentration value comprises: calculating according to the following formula: current oxygen concentration value = [(air amount X k) + oxygen amount)] / (air amount + oxygen amount), wherein k is in the air Oxygen content ratio. Further, before the step c is performed, the control method further includes: determining whether the current control state of the ventilator is capacity control, and if yes, performing step 0. Further, after performing step c, the control method further includes: determining, according to the adjusted oxygen concentration value and the preset oxygen concentration value, whether the mixed oxygen control is up to standard, and if yes, the gas proportional control ends. If not, coarsely adjust the air proportional valve and the oxygen proportional valve, then return to step c. According to another aspect of the present invention, a ventilator gas proportional control device includes: an acquisition module: configured to acquire an opening degree flow rate relationship between an air proportional valve and an oxygen proportional valve of the ventilator; and a control module: a relationship between the opening degree and the flow rate and a preset oxygen concentration value to control the air proportional valve and the oxygen proportional valve; and a fine adjustment module: for using the current oxygen concentration value and the preset oxygen concentration value Adjust the air proportional valve and the oxygen proportional valve. Further, the obtaining module comprises: a calibration module: verifying the air proportional valve and the oxygen proportional valve to determine a relationship between an opening degree and a flow rate of the air proportional valve and the oxygen proportional valve. Further, the control module includes: a first determining module, configured to determine, according to the preset oxygen concentration value, whether hybrid oxygen control is required. Further, the first determining module includes: a monitoring module, configured to monitor, in real time, the amount of air and oxygen output by the ventilator, and calculate a current oxygen concentration value; and a calculation module, configured to calculate a current oxygen concentration value. Further, the fine adjustment module includes: a second determining module, configured to determine whether the current control state of the ventilator is capacity control. Compared with the prior art, the beneficial effects of the invention are: the technical scheme is used for real-time monitoring of the oxygen concentration of the given gas, and the double closed-loop control of the oxygen concentration, so that the given gas oxygen concentration and the set oxygen concentration Consistently, the accuracy of the mixed oxygen control is improved. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a main flow chart of a ventilator gas proportional control method according to the present invention; FIG. 2 is a graph showing a relationship between an opening degree and a flow rate of an air proportional valve and an oxygen proportional valve according to the present invention; ; 3 is a detailed flow chart of a ventilator gas proportional control method according to the present invention; FIG. 4 is a schematic structural view of a ventilator gas proportional control device according to the present invention; In the case of no conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. The invention aims at the deviation of the clinical monitoring of oxygen concentration, and proposes a specific method and device for controlling the proportion of the ventilator gas. 1 is a main flow chart of a ventilator gas proportional control method according to the present invention. Referring to FIG. 1, a ventilator gas ratio control method includes: a: obtaining an air proportional valve and an oxygen ratio of the ventilator The relationship between the opening degree of the valve and the flow rate; b: controlling the air proportional valve and the oxygen proportional valve according to the relationship between the opening degree and the flow rate and the preset oxygen concentration value; and c: according to the current oxygen concentration value and the preset The oxygen concentration value fine-tunes the air proportional valve and the oxygen proportional valve. Specifically, the relationship between the opening degree and the flow rate of the air proportional valve and the oxygen proportional valve of the ventilator is obtained by verifying the air proportional valve and the oxygen proportional valve, as shown in FIG. 2, FIG. 2 is A graph of the relationship between the opening and the flow rate of the air proportional valve and the oxygen proportional valve according to the present invention. The relationship between the opening of the air proportional valve and the oxygen proportional valve of the ventilator and the flow rate can be seen from Fig. 2. Before performing the mixed oxygen control, first make a judgment on whether or not the mixed oxygen control is required, as shown in FIG. 3, FIG. 3 is a specific flowchart of a method for controlling the gas ratio of the ventilator according to the present invention; The standard is the preset oxygen concentration value. When the result of the judgment is YES, the capacity control is judged. If it is pressure control, it enters the real-time adjustment. If it is the capacity control, the air and oxygen in this cycle are fine-tuned. After the fine adjustment, , judging the compliance condition of the mixed oxygen control, and not satisfying the preset oxygen concentration value At this time, the air proportional valve and the oxygen proportional valve are coarsely adjusted, and the steps before the fine adjustment are returned. 4 is a ventilator gas proportional control device implementing the above method. Referring to FIG. 4, a ventilator gas proportional control device includes: an acquisition module 401: an air proportional valve and an oxygen proportional valve for acquiring the ventilator The opening degree flow rate relationship; the control module 403: configured to control the air proportional valve and the oxygen proportional valve according to the relationship between the opening degree and the flow rate and the preset oxygen concentration value; and the fine adjustment module 405: for using the current oxygen concentration value And adjusting the air proportional valve and the oxygen proportional valve with the preset oxygen concentration value. Further, the obtaining module comprises: a calibration module (not shown): the air proportional valve and the oxygen proportional valve are verified to determine the relationship between the opening degree and the flow rate of the air proportional valve and the oxygen proportional valve. Further, the control module includes: a first determining module (not shown) for determining whether the mixed oxygen control is required according to the preset oxygen concentration value. Further, the first determining module includes: a monitoring module (not shown), configured to monitor, in real time, the amount of air and oxygen output by the ventilator, and calculate a current oxygen concentration value; and a calculation module, configured to calculate Current oxygen concentration value. Further, the fine adjustment module includes: a second determining module (not shown) for determining whether the current control state of the ventilator is capacity control. Through the above embodiments, it can be seen that the technical solution of the present invention is used for real-time monitoring of the oxygen concentration of the given gas, and the double closed-loop control of the oxygen concentration, so that the given gas oxygen concentration is consistent with the set oxygen concentration, and the mixing is improved. The accuracy of oxygen control. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Where is the spirit and principle of the present invention Any modifications, equivalent substitutions, improvements, etc. made therein are intended to be included within the scope of the present invention.

Claims

权 利 要 求 书 Claim
1. 一种呼吸机气体比例控制方法， 其特征在于， 包括： a: 获取所述呼吸机的空气比例阀和氧气比例阀的开度与流速的关系； b: 根据所述开度与流速的关系以及预设氧浓度值控制所述空气比例阀和氧 气比例阀； 以及 A method for controlling a ventilator gas ratio, comprising: a: acquiring a relationship between an opening degree of an air proportional valve and an oxygen proportional valve of the ventilator and a flow rate; b: according to the opening degree and the flow rate a relationship and a preset oxygen concentration value to control the air proportional valve and the oxygen proportional valve;
C : 根据当前氧浓度值和所述预设氧浓度值微调所述空气比例阀和氧气比例 阀。 C: The air proportional valve and the oxygen proportional valve are finely adjusted according to the current oxygen concentration value and the preset oxygen concentration value.
2. 根据权利要求 1所述的呼吸机气体比例控制方法， 其特征在于， 所述步 骤 a包括： 校验所述空气比例阀和氧气比例阀， 以确定所述空气比例阀和氧气比例阀 的开度和流速关系。 2. The ventilator gas ratio control method according to claim 1, wherein the step a comprises: verifying the air proportional valve and the oxygen proportional valve to determine the air proportional valve and the oxygen proportional valve The relationship between opening and flow rate.
3. 根据权利要求 1所述的呼吸机气体比例控制方法， 其特征在于， 在执行步骤 b之前， 所述控制方法还包括： 比较当前氧浓度值与预设氧浓 度值， 判断是否需要进行混氧控制， 若是， 执行步骤1)。 The ventilator gas ratio control method according to claim 1, wherein before the step b is performed, the control method further comprises: comparing the current oxygen concentration value with the preset oxygen concentration value to determine whether the mixing is required Oxygen control, if yes, perform step 1).
4. 根据权利要求 3所述的呼吸机气体比例控制方法， 其特征在于， 所述判断是否需要进行混氧控制包括： 所述呼吸机实时监测输出的空气量 和氧气量， 并计算所述当前氧浓度值。 The ventilator gas ratio control method according to claim 3, wherein the determining whether the oxygen mixing control is required comprises: the ventilator monitoring the output air amount and the oxygen amount in real time, and calculating the current Oxygen concentration value.
5. 根据权利要求 4所述的呼吸机气体比例控制方法， 其特征在于， 所述计算当前氧浓度值包括： 根据以下公式计算得出： 当前氧浓度值 = [(空 气量 x k)+氧气量 )]/(空气量 +氧气量)， 其中 k为空气中氧气含量比例。 The ventilator gas ratio control method according to claim 4, wherein the calculating the current oxygen concentration value comprises: calculating according to the following formula: current oxygen concentration value = [(air amount xk) + oxygen amount )] / (air volume + oxygen amount), where k is the proportion of oxygen content in the air.
6. 根据权利要求 5所述的呼吸机气体比例控制方法， 其特征在于， 在执行步骤 c之前， 所述控制方法还包括， 判断所述呼吸机当前的控制状 态是否是容量控制， 若是， 执行步骤^ The ventilator gas ratio control method according to claim 5, wherein before the step c is performed, the control method further comprises: determining whether the current control state of the ventilator is capacity control, and if so, performing Step ^
7. 根据权利要求 6所述的呼吸机气体比例控制方法， 其特征在于， 在执行步骤 c之后， 所述控制方法还包括： 根据微调后的氧浓度值和所述 预设氧浓度值， 判断所述混氧控制是否达标， 若是， 所述气体比例控制结束， 若否， 粗调所述空气比例阀和氧气比例阀， 然后返回步骤 c。 The ventilator gas ratio control method according to claim 6, wherein after the step c is performed, the control method further comprises: judging according to the adjusted oxygen concentration value and the preset oxygen concentration value Whether the mixed oxygen control is up to standard, and if so, the gas proportional control ends, if not, coarsely adjusts the air proportional valve and the oxygen proportional valve, and then returns to step c.
8. 一种呼吸机气体比例控制装置， 其特征在于， 包括： 获取模块： 用于获取所述呼吸机的空气比例阀和氧气比例阀的开度流速关 系； 控制模块： 用于根据所述开度与流速的关系以及预设氧浓度值控制所述空 气比例阀和氧气比例阀； 以及 微调模块： 用于根据当前氧浓度值和所述预设氧浓度值微调所述空气比例 阀和氧气比例阀。  A ventilator gas proportional control device, comprising: an acquisition module: configured to acquire an opening degree flow rate relationship between an air proportional valve of the ventilator and an oxygen proportional valve; and a control module: configured to open according to the a relationship between the degree and the flow rate and a preset oxygen concentration value to control the air proportional valve and the oxygen proportional valve; and a fine adjustment module: for finely adjusting the air proportional valve and the oxygen ratio according to the current oxygen concentration value and the preset oxygen concentration value valve.
9. 根据权利要求 8所述的呼吸机气体比例控制装置， 其特征在于， 所述获 取模块包括： 校验模块： 校验所述空气比例阀和氧气比例阀， 以确定所述空气比例阀和 氧气比例阀的开度与流速的关系。 9. The ventilator gas proportional control device according to claim 8, wherein the acquisition module comprises: a verification module: calibrating the air proportional valve and an oxygen proportional valve to determine the air proportional valve and The relationship between the opening of the oxygen proportional valve and the flow rate.
10. 根据权利要求 8所述的呼吸机气体比例控制装置， 其特征在于， 所述控制模块包括： 第一判断模块， 用于根据所述预设氧浓度值， 判断是 否需要进行混氧控制。 The ventilator gas proportional control device according to claim 8, wherein the control module comprises: a first determining module, configured to determine, according to the preset oxygen concentration value, No mixing control is required.
11. 根据权利要求 10所述的呼吸机气体比例控制装置， 其特征在于， 所述 第一判断模块包括： 监测模块， 用于所述呼吸机实时监测输出的空气量和氧气量， 并计算当前 氧浓度值； 以及  The ventilator gas proportional control device according to claim 10, wherein the first determining module comprises: a monitoring module, configured to monitor, in real time, the amount of air and oxygen output by the ventilator, and calculate a current Oxygen concentration value;
计算模块， 用于计算当前的氧浓度值。  A calculation module for calculating the current oxygen concentration value.
12. 根据权利要求 8所述的呼吸机气体比例控制装置，其特征在于， 所述微 调模块包括： 12. The ventilator gas ratio control device according to claim 8, wherein the fine adjustment module comprises:
第二判断模块， 用于判断所述呼吸机当前的控制状态是否是容量控制。  The second determining module is configured to determine whether the current control state of the ventilator is capacity control.
PCT/CN2011/084698 2010-12-31 2011-12-26 Method and device for controlling gas ratio of breathing machine WO2012089092A1 (en)

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