CN109821120A - Blowing method, system and the ventilator with the system - Google Patents
Blowing method, system and the ventilator with the system Download PDFInfo
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- CN109821120A CN109821120A CN201910143743.7A CN201910143743A CN109821120A CN 109821120 A CN109821120 A CN 109821120A CN 201910143743 A CN201910143743 A CN 201910143743A CN 109821120 A CN109821120 A CN 109821120A
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Abstract
The present invention provides a kind of blowing method, system and with the ventilator of the system, the blowing method, comprising: when inspiratory phase, controller controls gas source by control valve and is inflated to purging box；When the pressure of the gas source reaches maximum value, controller, which controls the gas source by control valve, to be stopped inflating the purging box；The purging box purges measurement pipeline by current limiter, wherein purging direction is from generator terminal is breathed to breathing pipeline direction.The method achieve polluting differential pressure pickup or pressure sensor by the gas that patient breathes out, while the measurement accuracy requirement of patient proximal end flow or pressure is not influenced.
Description
Technical field
The present invention relates to medical instruments field more particularly to a kind of purging blowing method, system and exhaling with the system
Suction machine.
Background technique
In order to measure the practical respiratory flow or pressure of patient, the only sensor in ventilator is often inadequate, this
Be because are as follows: there may be leakages for 1. pipelines or mask；2. outlet valve may deflate；3. there are compliances for pipeline, work as pressure
Power can store or discharge portion gas when changing.These factors all prevent the sensor in ventilator from accurately detecting disease
The respiratory flow of people.In order to more accurately measure the practical respiratory flow or pressure of patient, need in patient proximal end or branch of exhaling
A flow sensor, usually differential pressure flow sensor are added on pipeline.Differential pressure flow sensor needs to sample by two
" pressure difference " is passed to the differential pressure pickup on ventilator by pipe.
The either differential pressure flow sensor of patient proximal end or the differential pressure flow sensor of expiration branch road, all suffer from
Contaminated risk.Since their measuring point is in patient one end or expiration bye-pass, the gas of patient's exhalation can flow through this
A little measuring points, the gas of exhalation may carry the germs of a disease, atomization medicine.Differential pressure pickup or pressure sensor on ventilator pass through
Sampling pipe connects these measuring points, it is meant that the contaminated gas near measuring point is possible to pollute on ventilator by sampling pipe
Differential pressure pickup or pressure sensor.
There are two types of existing solutions, one is biofilter is added on pressure-measuring pipe road, increases biofilter
Mean the increase of consumptive material, while can also introduce measurement inaccuracy.Why increasing biofilter will affect pressure and flow
The accuracy of measurement is because the conduction of pressure signal can be hindered by biofilter.
Another kind is to be purged using a gas source to measurement pipeline, and purging direction is from generator terminal is breathed to measurement point side
To.And other problem: 1. pressure measurements inaccuracy can then be introduced to measurement pipeline purging using gas source；2. flow measurement is inaccurate
Really；3. the gas supply capacity of pair gas source claims.For many ventilators, gas source, which is provided separately, if it is purging to seem
It excessively wastes and makes that structure is complicated, and the negative of gas source can be made when opening and closing and purging if purging and ventilating and share gas source
Carrying the unexpected variation of generation just will affect the performance in ventilatory function if the variation of this load is relatively violent.
Summary of the invention
In order to solve the technical problems existing in the prior art, the present invention provides a kind of blowing method, system and have
The ventilator of the system, it is intended to which the gas that purging prevents differential pressure pickup or pressure sensor from being breathed out by patient is carried out to breathing pipeline
While body pollution, the measurement accuracy requirement of patient proximal end flow or pressure is not influenced.
A kind of blowing method, comprising:
When inspiratory phase, controller controls gas source by control valve and is inflated to purging box；
When the pressure of the gas source reaches maximum value, controller controls the gas source stopping by control valve and blows described
Sweep box inflation；The purging box purges measurement pipeline by current limiter, wherein purging direction is from breathing generator terminal to exhaling
Suction pipe road direction.In some embodiments, the method also includes:
During breathing machine ventilation, the purging box persistently purges the measurement pipeline.
In some embodiments, the purging box purge to measurement pipeline by current limiter includes:
The purging box purges the measurement pipeline by the first current limiter and the second current limiter, wherein described
One current limiter is arranged in the first hose of the purging box being connected to the first sampling pipe, and second current limiter is arranged in institute
In the second hose being connected to the second sampling pipe for stating purging box.
In some embodiments, the vapour lock of first current limiter is greater than or equal to N times of the vapour lock of third sampling pipe, institute
N is stated by the pressure of the first thief hatch of differential pressure flow sensor, the gas appearance pressure of the purging box and the pressure sensor
Measurement accuracy determines.
In some embodiments, the vapour lock of first sampling pipe is identical as the vapour lock of second sampling pipe；
The vapour lock of first current limiter is identical as the vapour lock of second current limiter；
The vapour lock of first current limiter is greater than or equal to M times of the vapour lock of first sampling pipe, and the M is by the pressure
Pressure, the pressure of the second thief hatch of the differential pressure flow sensor and described of first thief hatch of poor flow sensor
The required precision of the difference of the pressure of one thief hatch and the pressure of second thief hatch determines.
In some embodiments, under preset conditions, it is adopted by the vapour lock of control first sampling pipe, described second
The vapour lock of the vapour lock of sample pipe, the vapour lock of first current limiter and second current limiter is so that flow measurement meets precision and wants
It asks.
A kind of purge system, including controller, gas source, control valve, purging box and current limiter,
The controller is for controlling opening or closing for the control valve, and when inspiratory phase, controller controls the control
Valve is opened so that the gas source is inflated the purging box, when the pressure of the gas source reaches maximum value, controller control
The control valve is made to close so that the gas source stops inflating the purging box；
The gas source is for being inflated the purging box；
The unlatching of the control valve realizes that the gas source is inflated the purging box, and the closing of the control valve is realized
The gas source stops inflating to the purging box；
The purging box is used to purge measurement pipeline by the current limiter, wherein purging direction is from ventilator
It holds to breathing pipeline direction；
The current limiter be used for limit it is described purging box purging enter it is described measurement pipeline purge stream size so that
The purge stream does not influence the measurement accuracy requirement of pressure or flow.
In some embodiments, the current limiter includes the first current limiter and the second current limiter,
First current limiter is arranged in the first hose of the purging box being connected to the first sampling pipe, and described first
Current limiter be used for limit it is described purging box purging enter first sampling pipe the first purge stream size so that this first
Purge stream does not influence the measurement accuracy requirement of flow；
Second current limiter is arranged in the second hose of the purging box being connected to the second sampling pipe, and described second
Current limiter be used for limit it is described purging box purging enter second sampling pipe the second purge stream size so that this second
Purge stream does not influence the measurement accuracy requirement of flow.
In some embodiments, the vapour lock of first current limiter is greater than or equal to N times of the vapour lock of third sampling pipe, institute
N is stated by the pressure of the first thief hatch of differential pressure flow sensor, the gas appearance pressure of the purging box and the pressure sensor
Measurement accuracy determines.
In some embodiments, the vapour lock of first sampling pipe is identical as the vapour lock of second sampling pipe；Described
The vapour lock of one current limiter is identical as the vapour lock of second current limiter；The vapour lock of first current limiter is greater than or equal to described the
M times of the vapour lock of one sampling pipe, the pressure of first thief hatch of the M by the differential pressure flow sensor, the differential pressure flow
The difference of the pressure of the pressure and second thief hatch of the pressure of second thief hatch of sensor and first thief hatch
Required precision determine.
In some embodiments, under preset conditions, it is adopted by the vapour lock of control first sampling pipe, described second
The vapour lock of the vapour lock of sample pipe, the vapour lock of first current limiter and second current limiter is so that flow measurement meets precision and wants
It asks.
A kind of ventilator, including any of the above-described purge system.
Blowing method provided by the invention, when inspiratory phase, controller controls gas source by control valve and fills to purging box
Gas；When the pressure of the gas source reaches maximum value, controller, which controls the gas source by control valve, to be stopped to the purging box
Inflation；The purging box purges measurement pipeline by current limiter, wherein purging direction is from generator terminal is breathed to respiratory siphon
Road direction.The method achieve differential pressure pickup or pressure sensor is polluted by the gas that patient breathes out, while not
Influence the measurement accuracy requirement of patient proximal end flow or pressure.
Detailed description of the invention
Attached drawing is to further understand for providing to the embodiment of the present invention, and constitute part of specification, under
The specific embodiment in face is used to explain the present invention embodiment together, but does not constitute the limitation to the embodiment of the present invention.Attached
In figure:
Fig. 1 is the structural block diagram of the purge system of embodiment；
Fig. 2 is the purging function pneumatic diagram of embodiment；
Fig. 3 is the flow chart of the blowing method of embodiment.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Differential pressure flow sensor is to flow through the device by gas to generate pressure difference to measure a kind of device of gas flow.
Differential pressure pickup is the sensor for detecting pressure difference between two measured points.
Pressure sensor is the sensor for detecting pressure difference between measured point and atmosphere.
In scene of the invention, differential pressure flow sensor is arranged between breathing mask and breathing pipeline, and close to patient
One end；Differential pressure pickup and pressure sensor are arranged on the integrated circuit board of ventilator.In other scene, pressure difference stream
Quantity sensor can be applied measures inspiratory flow rate and pressure of inspiration(Pi) in suction line, and prevents differential pressure pickup and pressure sensing
Device is polluted by things such as example extraneous dusts；Also differential pressure flow sensor can apply in expiration pipeline measure exhalation flow rate and
Breath pressure, and the air stream contamination for preventing differential pressure pickup and pressure sensor from being breathed out by patient.
Blowing method and purge system provided by the invention are applied to ventilator, as shown in Figure 1, the purge system includes control
Device processed, gas source, control valve, purging box and current limiter, the gas source can be provided by the blower of ventilator, can also be by other gas
Source provides, and the gas source is used to be inflated purging box；The control valve is arranged between the gas source and the purging box,
The unlatching of the control valve realizes that the gas source is inflated the purging box, and the gas source is realized in the closing of the control valve
The purging box is stopped inflating；The controller is for controlling opening or closing for the control valve, described in controller control
Control valve is opened so that the gas source is inflated the purging box, and controller controls the control valve and closes so that the gas
Source stops inflating the purging box；The current limiter is used to limit the purging that the purging box purging enters the breathing pipeline
The size of air-flow is not so that the purge stream influences the measurement accuracy requirement of pressure or flow.
The purging function pneumatic diagram is as shown in Fig. 2, specifically, the first sampling pipe (not shown in FIG.) connects differential pressure flow
First thief hatch of sensor and the first entrance (not shown in FIG.) of differential pressure pickup, the second sampling pipe (do not show in figure
The second thief hatch of differential pressure flow sensor and the second entrance (not shown in FIG.) of differential pressure pickup are connected out), and third is adopted
Sample pipe (not shown in FIG.) is that the branch in one end point of the nearly differential pressure pickup of the first sampling pipe comes out, which connects pressure
The entrance (not shown in FIG.) of sensor, certain third sampling pipe are also possible to one end of the nearly differential pressure pickup of the second sampling pipe
A branch is divided to come out, which connects the entrance of pressure sensor.It is P that the gas for purging box, which holds pressure,r, differential pressure flow sensor
The pressure of first thief hatch is P+, the pressure of the second thief hatch of differential pressure flow sensor is P-, the pressure of differential pressure pickup first entrance
Power is Pc+, the pressure of differential pressure pickup second entrance is Pc-, the vapour lock of the first sampling pipe is R1, the vapour lock of the second sampling pipe is
R2, the vapour lock of the first current limiter is R3, the vapour lock of the second current limiter is R4, purged in function pneumatic diagram shown in figure one, third
The vapour lock of sampling pipe is identical as the vapour lock of the first sampling pipe, is also R1.Wherein, the nearly patient of the first thief hatch of differential pressure flow sensor
One end, the second thief hatch of differential pressure flow sensor is adjacent to the first thief hatch, and the first thief hatch and the second thief hatch are distributed in pressure
The both ends of the diaphragm of poor flow sensor.
The principle of the measuring flow of differential pressure pickup is to generate pressure after the diaphragm of differential pressure flow sensor according to air-flow
Poor Δ P obtains corresponding flow, flow measurement accuracy representing after fitting, interpolation are as follows:
The case where for only measuring flow, wherein measuring flow includes measurement expiratory gas flow or measurement inspiratory flow, purging
The first hose and the second hose is arranged in box, and current limiter includes the first current limiter and the second current limiter, and the first current limiter may include
Single current limiter also may include multiple current limiters, and the second current limiter may include that single current limiter also may include multiple current limlitings
Device.First hose is connected to the first sampling pipe, and first current limiter is arranged in the first hose and nearly purging box one end, and second
Hose is connected to the second sampling pipe, and second current limiter is arranged in the second hose and nearly purging box one end, when inspiratory phase, gas
Source pressure is higher, and controller controls gas source by control valve and is inflated to purging box, when the pressure of the gas source reaches maximum
When value namely purging box reaches highest pressure, and controller controls the gas source by control valve and stops to the purging box at this time
Inflation purges measurement pipeline i.e. the first sampling pipe and the second sampling pipe by purging box.Purging box can be deemed to be one
A gas holds, and after gas source is to purging box inflation, internal pressure is increased, and it is first soft to be set the first current limiter for the gas of storage
Second hose post-purge of pipe and the second current limiter measures pipeline.Due to purging box pressure be higher than breathing pipeline pressure, first
The tie point and the second hose of hose and measurement pipeline and the tie point for measuring pipeline are all breathing generator terminal, therefore measure in pipeline
The flow direction of purge gas be from breathing generator terminal to breathing pipeline, rather than in turn, therefore can be to avoid pressure difference sensing
Device is contaminated, and the setting of current limiter can guarantee the requirement of flow measurement precision.
The case where for only measuring pressure, third sampling pipe are the branch in one end point of the nearly differential pressure pickup of the first sampling pipe
Road comes out, which connects the entrance of pressure sensor, and the first hose and the second hose, the first hose and first is arranged in purging box
Sampling pipe is connected to and then is also connected to third sampling pipe, and first current limiter is arranged in the first hose and nearly purging box one
End, when inspiratory phase, bleed pressure is higher, and controller controls gas source by control valve and is inflated to box is purged, when the gas source
Pressure is when reaching maximum value namely purging box reaches highest pressure, controller controls the gas source by control valve and stops at this time
Only the purging box is inflated, pressure measurement pipeline, that is, third sampling pipe is purged by purging box.Purging box can be regarded
Work is that a gas holds, and after gas source is to purging box inflation, internal pressure is increased, and the gas of storage is set the first current limiter
First hose post-purge measures pipeline.Since the pressure of purging box is higher than the pressure of breathing pipeline, scavenging pipeline and measurement pipeline
Tie point all in breathing generator terminal, therefore the flow direction for measuring the purge gas in pipeline is from breathing generator terminal to respiratory siphon
Road, rather than in turn, therefore can be contaminated to avoid pressure sensor, and the setting of the first current limiter can guarantee pressure
The requirement of measurement accuracy.
The case where for measuring flow simultaneously and pressure, the first sampling pipe connects the first thief hatch of differential pressure flow sensor
With the first entrance of differential pressure pickup, the second sampling pipe connects second thief hatch and differential pressure pickup of differential pressure flow sensor
Second entrance, third sampling pipe connect the entrance of pressure sensor and the first thief hatch (nearly patient one of differential pressure flow sensor
End).It purges box and the first hose and the second hose is set, current limiter includes the first current limiter and the second current limiter, the first current limiter
It may include single current limiter also may include multiple current limiters, the second current limiter may include that single current limiter also may include
Multiple current limiters.First hose is connected to the first sampling pipe and third sampling pipe, and first current limiter is arranged in the first hose
In and nearly purging box one end, the second hose be connected to the second sampling pipe, the second current limiter setting is in the second hose and closely
Box one end is purged, when inspiratory phase, bleed pressure is higher, and controller controls gas source by control valve and is inflated to box is purged, when
When the pressure of the gas source reaches maximum value namely purging box reaches highest pressure, and controller controls institute by control valve at this time
It states gas source to stop inflating the purging box, measurement pipeline i.e. the first sampling pipe, the second sampling pipe and third is adopted by purging box
Sample pipe is purged.Purging box, which can be deemed to be a gas, to be held, and after gas source is to purging box inflation, internal pressure is increased, and deposits
The gas of storage is set the first hose of the first current limiter and the second hose post-purge measurement pipeline of the second current limiter.Due to
The pressure for purging box is higher than breathing pipeline pressure, tie point and the second hose and the measurement pipeline of the first hose and measurement pipeline
Tie point all in breathing generator terminal, therefore the flow direction for measuring the purge gas in pipeline be from breathing generator terminal to breathing pipeline,
Rather than in turn, therefore can be contaminated to avoid differential pressure pickup and pressure sensor, and the setting of current limiter can be protected
It demonstrate,proves the requirement of flow measurement precision and guarantees the requirement of pressure measurement accuracy.
In each embodiment below, because the vapour lock of the first current limiter is much larger than the vapour lock of the first hose, the second limit
The vapour lock for flowing device is much larger than the vapour lock of the second hose, so can ignore the vapour lock of the first hose and the gas of the second hose herein
Resistance, without considering.As shown in figure 3, a kind of blowing method in one embodiment, comprising the following steps:
Step S110: when inspiratory phase, controller controls gas source by control valve and is inflated to purging box.
Specifically, in each inspiratory phase, controller controls gas source by control valve and is inflated to purging box.Gas source
It can be provided by blower, control valve setting is between blower and purging box, and when inspiratory phase, controller is powered to control valve, control
Valve is opened, and the gas outlet of blower is connected to purging box, is inflated to purging box.
Step S120: when the pressure of the gas source reaches maximum value, controller controls the gas source by control valve and stops
Only the purging box is inflated.
Specifically, when the pressure of gas source reaches maximum value, the pressure of gas source can be monitored by pressure sensor, right
When blower is as gas source, the pressure maximum rating of gas source corresponds to the state of the maximum flow of blower, and the flow of blower can be with
It is monitored by flow sensor, when the maximum flow of blower, controller stops being powered to control valve, and control valve is closed,
The gas outlet of blower is not connected to purging box, and blower stops to purging box inflation.
Step S130: the purging box purges measurement pipeline by current limiter, wherein purging direction is from breathing
Generator terminal is to breathing pipeline direction.
Specifically, current limiter is arranged in the scavenging pipeline with measurement pipeline connection of purging box, and close purging box one
End, measurement pipeline includes pressure measurement pipeline and/or flow measurement pipeline, and the gas in the purging box flows through right after current limiter
Measurement pipeline is purged.Purging box, which can be deemed to be a gas, to be held, after blower is to purging box inflation, internal pressure liter
Height, the gas of storage are set the scavenging pipeline post-purge measurement pipeline of current limiting device.Since the pressure of purging box is higher than breathing
The tie point of the pressure of pipeline, scavenging pipeline and measurement pipeline measures the stream of the purge gas in pipeline in breathing generator terminal
Dynamic direction is from breathing generator terminal to breathing pipeline, rather than in turn, therefore can be contaminated to avoid sensor, and current limiter
Setting can guarantee the requirement of sensor accuracy class.
In some embodiments, the blowing method further include:
Step S210: during breathing machine ventilation, the purging box persistently purges the measurement pipeline.
Specifically, during breathing machine ventilation, when each inspiratory phase, blower is inflated purging box, when the stream of blower
Stop when amount is maximum to purging box inflation, due to the presence of breathing pipeline vapour lock, bleed pressure is higher than the pressure of measured point, therefore
When gas source is inflated purging box, purging box can effectively be purged measurement pipeline；When gas source stops to purging box
When inflation, purges the gas in box and hold the maximum that pressure is in pressure in the respiratory cycle, by selecting suitable current limiter to limit
Purge flow rate, it can be ensured that purge pressure and the difference of point pressure to be measured in box in the entire respiratory cycle and maintain one reasonably
Value to guarantee to purge performance, and then guarantees in expiratory gas flow measurement or inspiratory flow measurement or pressure measurement, pressure difference sensing
The gaseous contamination that device or pressure sensor are not breathed out by patient.Only opening controlling valve, blower pair within a period of time of inspiratory phase
Purging box is inflated, and when control valve is closed, purging box persistently purges measurement pipeline, and blower stops to purging
Box inflation, at this time will not have an impact the load of blower；When control valve is opened, since the vapour lock of current limiter is very big,
By the flow very little of current limiter, therefore blower is only used for improving the pressure of purging box to purging box inflation, it is assumed that purges box
Capacity is V, and the process adherence pressure Δ P' of inflation, the capacity of inflation is V* Δ P', since V and Δ P' are relative to gas source
Gas supply capacity is smaller, therefore even if the time of inflation is very short, there will not be very big flow, therefore purging will not lead to blower
Gas load has an impact, and then does not influence the ventilatory function of ventilator.
In some embodiments, it includes: the purging box that the purging box, which carries out purging to measurement pipeline by current limiter,
The measurement pipeline is purged by the first current limiter and the second current limiter, wherein first current limiter is arranged described
It purges in the first hose of box being connected to the first sampling pipe and nearly purging box one end, the second current limiter setting is blown described
It sweeps in the second hose of box being connected to the second sampling pipe and nearly purging box one end.
In embodiment for measuring pressure, the vapour lock of first current limiter is greater than or equal to the vapour lock of third sampling pipe
N times, the N holds pressure and the pressure by the pressure of the first thief hatch of differential pressure flow sensor, the gas of the purging box
The measurement accuracy of sensor determines.
Specifically, for measurement pressure the case where, as shown in Figure 1, third sampling pipe (not shown in FIG.) is first to adopt
The branch in one end of the nearly differential pressure pickup of sample pipe point comes out, and the entrance of branch connection pressure sensor (does not show in figure
Out).Pc+And Pc-Meet following relationship:
The pressure of the entrance of pressure sensor is identical as the pressure of differential pressure pickup first entrance, and differential pressure pickup first
The pressure of entrance is identical as patient end force samples mouth, then patient end force samples mouth Pp meets
As it can be seen that working as R3>>R1When, PrInfluence be negligible, P at this timep≈P+。
Set the vapour lock R of the first current limiter3More than or equal to the vapour lock R of third sampling pipe1N times, the N is according to Pc+With P+
The error for needing to meet can be obtained.Concrete example is as follows:
Set P+Greater than 10cmH2When O, it is desirable that error is less than or equal to 1%, then
It can be derived by relational expression (4)
Wherein set | Pr-P+| it is up to 100cmH2O, P+Minimum 10cmH2O can then be derived by relational expression (5)
It can be derived by relational expression (6)
R3≥1001×R1 (7)
P at this timep≈P+, purge the requirement for not influencing pressure sensor measurement accuracy.
For the embodiment of measurement inspiratory flow or expiratory gas flow, a kind of situation, the vapour lock of first sampling pipe and institute
The vapour lock for stating the second sampling pipe is identical；The vapour lock of first current limiter is identical as the vapour lock of second current limiter；Described
The vapour lock of one current limiter is greater than or equal to M times of the vapour lock of first sampling pipe, and the M is by the differential pressure flow sensor
The pressure of first thief hatch, the differential pressure flow sensor the second thief hatch pressure and first thief hatch pressure
Required precision with the difference of the pressure of second thief hatch determines.
Specifically, the principle of the measuring flow of differential pressure pickup is the diaphragm for passing through differential pressure flow sensor according to air-flow
Pressure differential deltap P is generated afterwards, obtains corresponding flow after fitting, interpolation.Pressure differential deltap P meets relational expression (8)
Δ P=Pc+-Pc- (8)
It is available by relational expression (2), (3) and (8)
It can be derived by relational expression (9)
If R1=R2, R3=R4, then can be derived by relational expression (10)
By relational expression (11) it is found that the gas of the pressure differential deltap P measured at this time and purging box holds pressure PrIt is unrelated, and work as R3>
>R1When,
ΔP≈P+-P- (12)
At this point, purging does not influence the measurement accuracy requirement of expiratory gas flow and inspiratory flow.
It can be derived by relational expression (11)
By relational expression (12) it is found that
The M known to relational expression (12) and (14) can be according to the pressure of the first thief hatch of the differential pressure flow sensor
P+, the differential pressure flow sensor the second thief hatch pressure P-And the pressure and described second of first thief hatch is adopted
The required precision of the difference DELTA P of the pressure of sample mouth determines.
For the embodiment of measurement inspiratory flow or expiratory gas flow, another situation passes through control under preset conditions
The vapour lock of first sampling pipe, the vapour lock of second sampling pipe, the vapour lock of first current limiter and second current limliting
The vapour lock of device is so that flow measurement meets required precision.
Specifically, the aeration status met required for which refers to, comprising: differential pressure flow sensor first is adopted
Sample mouth pressure P+, purging box gas hold pressure PrWith the magnitude of pressure differential (P formed to measurement of discharge+-P-).By relational expression (10) it is found that
Under preset conditions, meet the requirements measurement accuracy can be by the vapour lock R of control first sampling pipe1, described
The vapour lock R of two sampling pipes2, first current limiter vapour lock R3And the vapour lock R of second current limiter4。
Blowing method provided by the invention, when inspiratory phase, controller controls gas source by control valve and fills to purging box
Gas；When the pressure of the gas source reaches maximum value, controller, which controls the gas source by control valve, to be stopped to the purging box
Inflation；The purging box purges measurement pipeline by current limiter, wherein purging direction is from generator terminal is breathed to respiratory siphon
Road direction.The method achieve differential pressure pickup or pressure sensor is polluted by the gas that patient breathes out, while not
Influence the measurement accuracy requirement of patient proximal end flow or pressure.
A kind of purge system, including controller, gas source, control valve, purging box and current limiter, the controller is for controlling
The control valve opens or closes, and when inspiratory phase, controller controls the control valve and opens so that the gas source is blown described
It sweeps box to be inflated, when the pressure of the gas source reaches maximum value, controller controls the control valve and closes so that the gas
Source stops inflating the purging box；The gas source is for being inflated the purging box；The unlatching of the control valve is realized
The gas source is inflated the purging box, and the closing of the control valve realizes that the gas source fills purging box stopping
Gas；The purging box be used for by the current limiter to measurement pipeline purge, wherein purging direction be from breathe generator terminal to
Breathing pipeline direction；The current limiter is used to limit the size that the purging box purging enters the purge stream of the measurement pipeline
So that the purge stream does not influence the measurement accuracy requirement of pressure or flow.
In some embodiments, the current limiter includes the first current limiter and the second current limiter, and first current limiter is set
It sets in the first hose of the purging box being connected to the first sampling pipe and nearly purging box one end, first current limiter is used for
Limit it is described purging box purging enter first sampling pipe the first purge stream size so that first purge stream not
Influence the measurement accuracy requirement of flow；Second be connected to the second sampling pipe of the purging box is arranged in second current limiter
In hose and nearly purging box one end, second current limiter are used to limit the purging box purging and enter second sampling pipe
The size of second purge stream is not so that second purge stream influences the measurement accuracy requirement of flow.
In some embodiments, the vapour lock of first current limiter of the purge system is greater than or equal to third sampling pipe
N times of vapour lock, the N hold pressure and described by the pressure of the first thief hatch of differential pressure flow sensor, the gas of the purging box
The measurement accuracy of pressure sensor determines.
In some embodiments, the vapour lock of the vapour lock of first sampling pipe of the purge system and second sampling pipe
It is identical；The vapour lock of first current limiter is identical as the vapour lock of second current limiter；The vapour lock of first current limiter is greater than
Or M times of the vapour lock equal to first sampling pipe, the M by the differential pressure flow sensor the first thief hatch pressure,
The pressure and second thief hatch of the pressure of second thief hatch of the differential pressure flow sensor and first thief hatch
Pressure difference required precision determine.
In some embodiments, the purge system under preset conditions, by control first sampling pipe vapour lock,
The vapour lock of the vapour lock of second sampling pipe, the vapour lock of first current limiter and second current limiter is so that flow measurement is full
Sufficient required precision.The specific descriptions of each embodiment of system entries refer to method item, and details are not described herein.
A kind of ventilator, including purge system described in the various embodiments described above.
In one embodiment, a kind of non-transitorycomputer readable storage medium including instruction is additionally provided, such as
Storage equipment including computer program (instruction), above procedure (instruction) can be executed by the processor of ventilator to complete this hair
Blowing method described in bright each embodiment.For example, the non-transitorycomputer readable storage medium can be ROM, random
Access memory (RAM), CD-ROM, tape, floppy disk and optical data storage devices etc..
The optional embodiment of the embodiment of the present invention is described in detail in conjunction with attached drawing above, still, the embodiment of the present invention is simultaneously
The detail being not limited in above embodiment can be to of the invention real in the range of the technology design of the embodiment of the present invention
The technical solution for applying example carries out a variety of simple variants, these simple variants belong to the protection scope of the embodiment of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the embodiment of the present invention pair
No further explanation will be given for various combinations of possible ways.
In addition, any combination can also be carried out between a variety of different embodiments of the embodiment of the present invention, as long as it is not
The thought of the embodiment of the present invention is violated, equally should be considered as disclosure of that of the embodiment of the present invention.
Claims (10)
1. a kind of blowing method characterized by comprising
When inspiratory phase, controller controls gas source by control valve and is inflated to purging box；
When the pressure of the gas source reaches maximum value, controller, which controls the gas source by control valve, to be stopped to the purging box
Inflation；The purging box purges measurement pipeline by current limiter, wherein purging direction is from generator terminal is breathed to respiratory siphon
Road direction.
2. blowing method according to claim 1, which is characterized in that the method also includes:
During breathing machine ventilation, the purging box persistently purges the measurement pipeline.
3. blowing method according to claim 2, which is characterized in that the purging box is by current limiter to measurement pipe
Road carries out purging
The purging box purges the measurement pipeline by the first current limiter and the second current limiter, wherein first limit
Stream device is arranged in the first hose of the purging box being connected to the first sampling pipe, and the second current limiter setting is blown described
It sweeps in the second hose of box being connected to the second sampling pipe.
4. blowing method according to claim 3, which is characterized in that the vapour lock of first current limiter is greater than or equal to the
N times of the vapour lock of three sampling pipes, the N are held by the pressure of the first thief hatch of differential pressure flow sensor, the gas of the purging box
Pressure and the measurement accuracy of the pressure sensor determine.
5. blowing method according to claim 3, which is characterized in that the vapour lock of first sampling pipe is adopted with described second
The vapour lock of sample pipe is identical；
The vapour lock of first current limiter is identical as the vapour lock of second current limiter；
The vapour lock of first current limiter is greater than or equal to M times of the vapour lock of first sampling pipe, and the M is by the pressure difference stream
The pressure of first thief hatch of quantity sensor, the pressure of the second thief hatch of the differential pressure flow sensor and described first are adopted
The required precision of the difference of the pressure of sample mouth and the pressure of second thief hatch determines.
6. blowing method according to claim 3, which is characterized in that under preset conditions, pass through control described first
The vapour lock of sampling pipe, the vapour lock of second sampling pipe, the vapour lock of the vapour lock of first current limiter and second current limiter
So that flow measurement meets required precision.
7. a kind of purge system, which is characterized in that including controller, gas source, control valve, box and current limiter are purged,
The controller is for controlling opening or closing for the control valve, and when inspiratory phase, controller controls the control valve and opens
It opens so that the gas source is inflated the purging box, when the pressure of the gas source reaches maximum value, controller controls institute
Control valve is stated to close so that the gas source stops inflating the purging box；
The gas source is for being inflated the purging box；
The unlatching of the control valve realizes that the gas source is inflated the purging box, described in the closing realization of the control valve
Gas source stops inflating to the purging box；
The purging box be used for by the current limiter to measurement pipeline purge, wherein purging direction be from breathe generator terminal to
Breathing pipeline direction；
The current limiter is used to limit the purging box purging and enters the size of the purge stream for measuring pipeline so that this blows
Scavenging stream does not influence the measurement accuracy requirement of pressure or flow.
8. purge system according to claim 7, which is characterized in that the current limiter includes the first current limiter and the second limit
Device is flowed,
First current limiter is arranged in the first hose of the purging box being connected to the first sampling pipe, first current limliting
Device is used to limit the size of first purge stream of the purging box purging into first sampling pipe so that first purging
Air-flow does not influence the measurement accuracy requirement of flow；
Second current limiter is arranged in the second hose of the purging box being connected to the second sampling pipe, second current limliting
Device is used to limit the size of second purge stream of the purging box purging into second sampling pipe so that second purging
Air-flow does not influence the measurement accuracy requirement of flow.
9. purge system according to claim 8, which is characterized in that the vapour lock of first current limiter is greater than or equal to the
N times of the vapour lock of three sampling pipes, the N are held by the pressure of the first thief hatch of differential pressure flow sensor, the gas of the purging box
Pressure and the measurement accuracy of the pressure sensor determine.
10. a kind of ventilator, which is characterized in that including purge system described in any one of claim 7 to 9.
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| CN201910143743.7A CN109821120A (en) | 2019-02-25 | 2019-02-25 | Blowing method, system and the ventilator with the system |
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| CN201910143743.7A CN109821120A (en) | 2019-02-25 | 2019-02-25 | Blowing method, system and the ventilator with the system |
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| CN110339443A (en) * | 2019-08-14 | 2019-10-18 | 北京毅安峰技术有限公司 | A kind of inhalation anesthetic vaporising device |
| CN110681013A (en) * | 2019-10-23 | 2020-01-14 | 深圳市科曼医疗设备有限公司 | Nonlinear air resistance and flushing module and breathing machine |
| CN111006917A (en) * | 2019-11-15 | 2020-04-14 | 中国辐射防护研究院 | Continuous sampling device for efficiency test of iodine adsorber |
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