CN109954190A - The overvoltage protective system of ventilator - Google Patents
The overvoltage protective system of ventilator Download PDFInfo
- Publication number
- CN109954190A CN109954190A CN201711401251.0A CN201711401251A CN109954190A CN 109954190 A CN109954190 A CN 109954190A CN 201711401251 A CN201711401251 A CN 201711401251A CN 109954190 A CN109954190 A CN 109954190A
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- Prior art keywords
- pressure
- ventilator
- valve
- chip microcontroller
- protective system
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Classifications
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- 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
- A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
-
- 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
- A61M16/0087—Environmental safety or protection means, e.g. preventing explosion
-
- 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
-
- 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
- A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
- A61M2016/0027—Accessories therefor, e.g. sensors, vibrators, negative pressure pressure meter
-
- 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
- A61M2205/3331—Pressure; Flow
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Anesthesiology (AREA)
- General Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Emergency Medicine (AREA)
- Animal Behavior & Ethology (AREA)
- Pulmonology (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
Abstract
The invention discloses a kind of overvoltage protective systems of ventilator, including pressure sensor, signal conditioning circuit, A/D conversion circuit, single-chip microcontroller, safe valve-driving circuit, the safety valve and exhalation valve connecting with gas source；Pressure sensor detects the pipeline pressure in breathing machine pipeline；Signal conditioning circuit is filtered enhanced processing to the pipeline pressure signal transmitted to obtain simulated pressure signal；Simulated pressure signal is converted to digital pressure signal by A/D conversion circuit；Single-chip microcontroller judges whether the numerical value of digital pressure signal is greater than pressure release critical value, it controls safety valve driving circuit driving safety valve when to be to close cutting gas source, open exhalation valve, control safety valve driving circuit drives safety valve to open conducting gas source, close exhalation valve when being no.The system that the present invention devises a kind of independent pressure monitoring and releases the control, is added in ventilator, and never influence whether the normal work and control of ventilator itself.
Description
Technical field
The present invention relates to the field of medical instrument technology, more particularly to a kind of overvoltage protective system of ventilator.
Background technique
Ventilator is a kind of instrument provided or assist patient respiration.It according to demand, according to certain frequency and moisture
Amount be patient lung carry out gas exchanges, so for gas pressure control and detect it is particularly important, because of hypertonia meeting
Wind-contusion is caused to the lung of patient.The generation of such case in order to prevent, ventilator just need to consider over voltage alarm in design
And safeguard measure.General method is to increase the parameter of one " pressure limit ", this parametric user can modify on demand.When exhaling
Suction machine monitors to open exhalation valve immediately when current pipeline pressure is more than this setting value, pressure is discharged.If ventilator
It is out of question in this way when pressure sensor and all normal exhalation valve control, but just in case has which relevant sensor or control
Parts damages processed just will not be played the role of releasing stress, be breakneck in this way！Because air pressure injury carrys out patient
Say it is very serious and irreversible.Ventilator due to be patients ' lives maintain instrument, be divided into Group III instrument, thus from
It is also most stringent of in supervision, and various single failures is all required.Wherein the safeguard measure of over-voltage is just clearly exhaled
Suction machine needs are executed by two kinds of approach.It does so and is greatly lowered since failure factor causes risk out of control.
Summary of the invention
The present invention is in view of the problems of the existing technology and insufficient, provides a kind of overvoltage protective system of ventilator.
The present invention is to solve above-mentioned technical problem by following technical proposals:
The present invention provides a kind of overvoltage protective system of ventilator, it is characterized in that comprising pressure sensor, signal tune
Manage circuit, A/D conversion circuit, single-chip microcontroller, safe valve-driving circuit, the safety valve and exhalation valve connecting with gas source；
The pressure sensor is for detecting the pipeline pressure in breathing machine pipeline and being transmitted to the signal conditioning circuit；
The signal conditioning circuit is for being filtered enhanced processing to the pipeline pressure signal transmitted to obtain simulated pressure
Signal；
The A/D conversion circuit is used to the simulated pressure signal be converted to digital pressure signal and by the digital pressure signal
It is transmitted to the single-chip microcontroller；
The single-chip microcontroller is for judging whether the numerical value of the digital pressure signal is greater than pressure release critical value, when to be
Controlling the safe valve-driving circuit drives safety valve closing to cut off the gas source, open the exhalation valve, and control should when to be no
Safe valve-driving circuit drives the safety valve to open and the gas source is connected, closes the exhalation valve.
Preferably, the overvoltage protective system further includes a charactron, the single-chip microcontroller is current for controlling the numeral method
Pressure value.
Preferably, the single-chip microcontroller and the ventilator are by RS232 serial communication, which is used for the logical of the safety valve
Disconnected state, which is sent to the ventilator, makes the ventilator know whether the overvoltage protective system performs overvoltage protection operation.
Preferably, the single-chip microcontroller is used to receive the pressure limit setting value that the ventilator transmits by RS232 serial ports, and
Critical value is discharged as final pressure after a cumulative numerical value on the basis of the pressure limit setting value.
Preferably, this is used for respirators in detecting the pipeline pressure in breathing machine pipeline by another pressure sensor, sentence
Whether the pipeline pressure numerical value that another pressure sensor detects that breaks is greater than the pressure limit setting value, control of exhaling when to be
Valve processed controls exhalation valve opening, and the exhalation control valve controls the exhalation valve closing when to be no.
On the basis of common knowledge of the art, above-mentioned each optimum condition, can any combination to get each preferable reality of the present invention
Example.
The positive effect of the present invention is that:
The system that the present invention devises a kind of independent pressure monitoring and releases the control, is added in ventilator, and absolutely
The normal work and control for not interfering with ventilator itself, suitable for it is any with air pressure mode control exhalation valve ventilator or
Anesthesia respirator.
Detailed description of the invention
Fig. 1 is the circuit diagram of the overvoltage protective system of the ventilator of present pre-ferred embodiments.
Fig. 2 is the circuit diagram of the ventilator of present pre-ferred embodiments.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
As illustrated in fig. 1 and 2, the present embodiment provides a kind of overvoltage protective systems 20 of ventilator comprising pressure sensor
1, signal conditioning circuit 2, A/D conversion circuit 3, single-chip microcontroller 4, safe valve-driving circuit 5, the safety valve 6 being connect with gas source, exhalation
Valve 7 and charactron 8.
The pressure sensor 1 is for detecting the pipeline pressure in breathing machine pipeline and being transmitted to the signal conditioning circuit；
The signal conditioning circuit 2 is for being filtered enhanced processing to the pipeline pressure signal transmitted to obtain simulated pressure
Signal；
The A/D conversion circuit 3 is for being converted to digital pressure signal for the simulated pressure signal and believing the digital pressure
Number it is transmitted to the single-chip microcontroller；
The single-chip microcontroller 4 is being yes for judging whether the numerical value of the digital pressure signal is greater than pressure release critical value
When control the safe valve-driving circuit 5 safety valve 6 driven to close and cut off the gas source, open the exhalation valve 7, for no time control
Making the safe valve-driving circuit 5 drives the safety valve 6 unlatching that the gas source is connected, closes the exhalation valve 7.
The single-chip microcontroller 4 is also used to control the charactron 8 and shows current pressure values, it can also be used to dependency number is shown when debugging
According to.
As illustrated in fig. 1 and 2, which is communicated with the ventilator 9 by RS232 serial ports 12, which is used for will
The on off operating mode of the safety valve 6, which is sent to the ventilator 9, makes the ventilator 9 know whether the overvoltage protective system 20 performed
Pressure protection operation.
The ventilator 9 is used to detect the pipeline pressure in breathing machine pipeline 10 by another pressure sensor, and judgement should
Whether the pipeline pressure numerical value of another pressure sensor detection is greater than the pressure limit setting value, exhalation control valve when to be
11, which control the exhalation valve 7, opens, and the exhalation control valve 11 controls the exhalation valve 7 and closes when to be no.
(1) booting powers on
Initialize input/output port, allow safety valve it is in the conductive state (ventilator by exhalation control valve it is normal
Control exhalation valve), so that A/D conversion circuit is in ready state, single-chip microcontroller is made to can control the display of charactron.Initialization communication
Related register makes RS232 serial ports be in ready state.
(2) it works normally
Receiving the pressure limit setting value that ventilator transmits by serial ports, (ventilator is provided with will after pressure limit parameter
It is sent to overvoltage protective system), 5cmH2O is added on the basis of being worth herein, discharges critical value as final pressure.Single-chip microcontroller
It periodically carries out A/D sampling and calculates current pipeline pressure value, be shown on charactron, while being also sent to ventilator, allow and exhale
Suction machine obtains pressure value measured by overvoltage protective system.Overvoltage protective system carries out this pressure value and pressure release critical value
Compare, shows that the pressure in pipeline is too high if more than, then gas source is cut off by safety valve, open exhalation valve, disease
People's pipeline pressure is declined rapidly, plays the role of overvoltage protection, while the state of safety valve on-off is sent to breathing
Machine, making ventilator also can know whether device performs overvoltage protection operation.Until the pressure in pipeline is lower than 8cmH2O, and tie up
After holding 10 seconds, then safety valve is connected, is restored to normal condition, ventilator can also restore to control exhalation valve.
The effect of overvoltage protective system:
Because ventilator itself can also be exhaled when pipeline pressure is more than pressure limit by control exhalation control valve to open
Valve out, so what device play a part of is a kind of duplicate protection, when ventilator of making provision against emergencies control failure, can also there is a pipe protection
Mechanism has also complied with the design requirement of ventilator.
Due to ventilator itself also to measure pipeline pressure value for breathing control, overvoltage protective system also wants measurement pipe
Control of the road pressure value for protection, the two use different pressure sensors, and the pressure measured can inevitably have difference, so
When designing overvoltage protective system, as far as possible with the pressure sensor that precision is high, drift is small, subsequent signal amplification and filtering are also wanted
Device small with temperature drift, reproducible can guarantee the accuracy for the pressure that overvoltage protective system is measured in this way, reduce the two
Between difference.In order to reduce the intervention that overvoltage protective system works normally ventilator, the actually pressure of overvoltage protective system
Discharge critical value it is 5cmH2O higher than the pressure limit setting value of ventilator, such ventilator in normal work, always by exhaling
Suction machine controls exhalation valve on demand, and only when ventilator is out of order, and pressure is not fallen in release, overvoltage protective system can just be risen
To the protective effect released stress, being thus when ventilator normal operation will not be by the interference of overvoltage protective system.
The applicability of overvoltage protective system:
Suitable for any ventilator or anesthesia respirator for controlling exhalation valve with air pressure mode.
The advantages of overvoltage protective system:
(1) compact is substantially independent from ventilator in gas circuit, and only need to do little change can be connected into device breathing
Machine.
(2) it is totally independent of ventilator on hardware circuit, should be fed only with power supply can work.
(3) ventilator software need to only carry out the modification of very little (as long as most simple scenario is to send pressure limit setting value
To device), system can be made to work.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that these
It is merely illustrative of, protection scope of the present invention is defined by the appended claims.Those skilled in the art is not carrying on the back
Under the premise of from the principle and substance of the present invention, many changes and modifications may be made, but these are changed
Protection scope of the present invention is each fallen with modification.
Claims (5)
1. a kind of overvoltage protective system of ventilator, which is characterized in that it includes pressure sensor, signal conditioning circuit, A/D turns
Change circuit, single-chip microcontroller, safe valve-driving circuit, the safety valve and exhalation valve connecting with gas source；
The pressure sensor is for detecting the pipeline pressure in breathing machine pipeline and being transmitted to the signal conditioning circuit；
The signal conditioning circuit is for being filtered enhanced processing to the pipeline pressure signal transmitted to obtain simulated pressure signal；
The A/D conversion circuit is for being converted to digital pressure signal for the simulated pressure signal and transmitting the digital pressure signal
To the single-chip microcontroller；
The single-chip microcontroller is for judging whether the numerical value of the digital pressure signal is greater than pressure release critical value, control when to be
The safe valve-driving circuit drives the safety valve to close and cuts off the gas source, opens the exhalation valve, and the safety is controlled when to be no
Valve-driving circuit drives the safety valve to open and the gas source is connected, closes the exhalation valve.
2. the overvoltage protective system of ventilator as described in claim 1, which is characterized in that the overvoltage protective system further includes one
Charactron, the single-chip microcontroller is for controlling the numeral method current pressure values.
3. the overvoltage protective system of ventilator as described in claim 1, which is characterized in that the single-chip microcontroller passes through with the ventilator
RS232 serial communication, the single-chip microcontroller make the ventilator know this for the on off operating mode of the safety valve to be sent to the ventilator
Whether overvoltage protective system performs overvoltage protection operation.
4. the overvoltage protective system of ventilator as claimed in claim 3, which is characterized in that the single-chip microcontroller is for passing through RS232
Serial ports receives the pressure limit setting value that the ventilator transmits, and the numerical value that adds up on the basis of the pressure limit setting value
Critical value is discharged as final pressure afterwards.
5. the overvoltage protective system of ventilator as claimed in claim 4, which is characterized in that this is used for respirators in passing through another
Pressure sensor detects the pipeline pressure in breathing machine pipeline, judges the pipeline pressure numerical value of another pressure sensor detection
Whether the pressure limit setting value is greater than, exhalation control valve controls exhalation valve opening, expiration control when to be no when to be
Valve processed controls exhalation valve closing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711401251.0A CN109954190A (en) | 2017-12-22 | 2017-12-22 | The overvoltage protective system of ventilator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711401251.0A CN109954190A (en) | 2017-12-22 | 2017-12-22 | The overvoltage protective system of ventilator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109954190A true CN109954190A (en) | 2019-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711401251.0A Pending CN109954190A (en) | 2017-12-22 | 2017-12-22 | The overvoltage protective system of ventilator |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080033308A1 (en) * | 2006-07-11 | 2008-02-07 | Shenzhen Mindray Bio-Medical Electronics Co., Ltd. | Non-invasive blood pressure measurement apparatus and safety protection method |
| CN101337101A (en) * | 2007-07-06 | 2009-01-07 | 深圳迈瑞生物医疗电子股份有限公司 | Aerating system of anesthesia apparatus and respirator and pressure monitoring method |
| CN202714849U (en) * | 2012-07-06 | 2013-02-06 | 深圳市理邦精密仪器股份有限公司 | Non-invasive blood pressure single fault overvoltage protective device |
| CN104352344A (en) * | 2014-12-08 | 2015-02-18 | 重庆南方数控设备有限责任公司 | Improved limb-pressurization physical therapy instrument |
| CN105327436A (en) * | 2014-08-08 | 2016-02-17 | 北京谊安医疗系统股份有限公司 | Control circuit of air way pressure of anaesthesia machine |
-
2017
- 2017-12-22 CN CN201711401251.0A patent/CN109954190A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080033308A1 (en) * | 2006-07-11 | 2008-02-07 | Shenzhen Mindray Bio-Medical Electronics Co., Ltd. | Non-invasive blood pressure measurement apparatus and safety protection method |
| CN101337101A (en) * | 2007-07-06 | 2009-01-07 | 深圳迈瑞生物医疗电子股份有限公司 | Aerating system of anesthesia apparatus and respirator and pressure monitoring method |
| CN202714849U (en) * | 2012-07-06 | 2013-02-06 | 深圳市理邦精密仪器股份有限公司 | Non-invasive blood pressure single fault overvoltage protective device |
| CN105327436A (en) * | 2014-08-08 | 2016-02-17 | 北京谊安医疗系统股份有限公司 | Control circuit of air way pressure of anaesthesia machine |
| CN104352344A (en) * | 2014-12-08 | 2015-02-18 | 重庆南方数控设备有限责任公司 | Improved limb-pressurization physical therapy instrument |
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Application publication date: 20190702 |