CN208611521U - The over-pressure safety device of ventilator - Google Patents

Abstract

The utility model discloses a kind of over-pressure safety devices 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 device that the utility model 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

The over-pressure safety device of ventilator

Technical field

The utility model relates to the field of medical instrument technology, more particularly to a kind of over-pressure safety device 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.

Utility model content

The utility model is in view of the problems of the existing technology and insufficient, provides a kind of over-pressure safety device of ventilator.

The utility model is to solve above-mentioned technical problem by following technical proposals:

The utility model provides a kind of over-pressure safety device of ventilator, it is characterized in that comprising pressure sensor, letter Number conditioning circuit, A/D conversion circuit, single-chip microcontroller, safe valve-driving circuit, the safety valve and exhalation valve being connect with gas source, the pressure Force snesor is placed in breathing machine pipeline, and the pressure sensor and the signal conditioning circuit are electrically connected, the signal conditioning circuit with A/D conversion circuit electrical connection, the A/D conversion circuit and the safe valve-driving circuit and the monolithic mechatronics, the safety valve Driving circuit is electrically connected with the safety valve, which is electrically connected with the exhalation valve.

Preferably, the over-pressure safety device further includes a charactron, which is electrically connected with the charactron.

Preferably, the single-chip microcontroller and the ventilator pass through RS232 serial communication.

Preferably, the safety valve is electrically connected with the exhalation valve by exhalation control valve.

On the basis of common knowledge of the art, above-mentioned each optimum condition, can any combination to get the utility model respectively compared with Good example.

The positive effect of the utility model is:

The device that the utility model devises a kind of independent pressure monitoring and releases the control, is added in ventilator, and And never influence whether the normal work and control of ventilator itself, suitable for any breathing for controlling exhalation valve with air pressure mode Machine or anesthesia respirator.

Detailed description of the invention

Fig. 1 is the circuit diagram of the over-pressure safety device of the ventilator of the utility model preferred embodiment.

Fig. 2 is the circuit diagram of the ventilator of the utility model preferred embodiment.

Specific embodiment

It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model Example, those of ordinary skill in the art's every other embodiment obtained without making creative work, all belongs to In the range of the utility model protection.

As illustrated in fig. 1 and 2, the present embodiment provides a kind of over-pressure safety devices 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 placed in breathing machine pipeline 10, the pressure sensor 1 and the signal conditioning circuit 2 Electrical connection, the signal conditioning circuit 2 are electrically connected with the A/D conversion circuit 3, the A/D conversion circuit 3 and the safe valve-driving circuit 5 are electrically connected with the single-chip microcontroller 4, which is electrically connected with the safety valve 6, and the safety valve 6 and the exhalation valve 7 are logical Cross the electrical connection of exhalation control valve 11.

The function that above-mentioned each component has is detailed below:

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 over-pressure safety device 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 over-pressure safety device), 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 over-pressure safety device.Over-pressure safety device 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 over-pressure safety device:

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, over-pressure safety device 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 over-pressure safety device, 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 over-pressure safety device is measured in this way, reduce the two Between difference.In order to reduce the intervention that over-pressure safety device works normally ventilator, the actually pressure of over-pressure safety device 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, over-pressure safety device can just be risen To the protective effect released stress, being thus when ventilator normal operation will not be by the interference of over-pressure safety device.

The applicability of over-pressure safety device:

Suitable for any ventilator or anesthesia respirator for controlling exhalation valve with air pressure mode.

The advantages of over-pressure safety device:

(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), device can be made to work.

Although the foregoing describe specific embodiment of the present utility model, it will be appreciated by those of skill in the art that These are merely examples, and the protection scope of the utility model is defined by the appended claims.Those skilled in the art Member can make numerous variations or be repaired to these embodiments under the premise of without departing substantially from the principles of the present invention and essence Change, but these change and modification each fall within the protection scope of the utility model.

Claims (4)

1. a kind of over-pressure safety device of ventilator, which is characterized in that it includes pressure sensor, signal conditioning circuit, A/D turns Circuit, single-chip microcontroller, safe valve-driving circuit, the safety valve and exhalation valve connecting with gas source are changed, which is placed in breathing In machine pipeline, the pressure sensor and the signal conditioning circuit are electrically connected, which is electrically connected with the A/D conversion circuit It connects, the A/D conversion circuit and the safe valve-driving circuit and the monolithic mechatronics, the safe valve-driving circuit and the safety valve Electrical connection, the safety valve are electrically connected with the exhalation valve.

2. the over-pressure safety device of ventilator as described in claim 1, which is characterized in that the over-pressure safety device further includes one Charactron, the single-chip microcontroller are electrically connected with the charactron.

3. the over-pressure safety device of ventilator as described in claim 1, which is characterized in that the single-chip microcontroller passes through with the ventilator RS232 serial communication.

4. the over-pressure safety device of ventilator as described in claim 1, which is characterized in that the safety valve passes through with the exhalation valve Exhalation control valve electrical connection.