CN206424395U - A kind of high-accuracy ventilation flow rate control system and medical breathing machine - Google Patents
A kind of high-accuracy ventilation flow rate control system and medical breathing machine Download PDFInfo
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- CN206424395U CN206424395U CN201621150355.XU CN201621150355U CN206424395U CN 206424395 U CN206424395 U CN 206424395U CN 201621150355 U CN201621150355 U CN 201621150355U CN 206424395 U CN206424395 U CN 206424395U
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Abstract
The utility model discloses a kind of high-accuracy ventilation flow rate control system and medical breathing machine, and it includes base, and its left upper end is provided with threeway seat；Threeway seat upper end is provided with threeway；Threeway includes the liberation port of the air inlet, the pneumostome of upper end and right-hand member of left end；Threeway is fixed on threeway seat by anchor ear；The upper right side of base is provided with electric machine support；Electric machine support right-hand member is provided with stepper motor；Stepper motor left end is connected with ball screw；Impeller-hub is connected with ball screw；The left end of impeller-hub is provided with the piston connect relative with liberation port；Piston is truncated cone-shaped structure, and is to be coaxially disposed between liberation port.The purpose of this utility model is to provide a kind of high-accuracy ventilation flow rate control system and medical breathing machine, simple in construction, production cost is low, noise is small, progressively can adjust and maintain to discharge the discharge area of gas, pressure and flow to lung ventilator realize accurate control, by pressure and Flow-rate adjustment to optimum state, the therapeutic effect of lung ventilator is improved.
Description
Technical field
The utility model belongs to medical instruments field, specially a kind of high-accuracy ventilation flow rate control system and medical respiration
Machine.
Background technology
In current clinical medicine, lung ventilator as one can artificial substituting expiratory positive airway pressure function effective means, it is general
Respiratory failure caused by a variety of causes is used for, the anesthesia respiration management during major operation, Breathing Suppotion treatment and emergency resuscitation
In, highly important position is occupied in Modern Medical Field.Lung ventilator is that one kind can play prevention and treatment respiratory failure,
Complication is reduced, the vital Medical Devices of patients ' lives are saved and extend.
The most adoption rate valve of traditional lung ventilator is controlled to output pressure and flow, and it is the disadvantage is that, structure is multiple
Miscellaneous, production cost is high, and the gas discharge area of liberation port is non-adjustable, and the control accuracy of pressure and flow is low；In addition, most of ratios
Example valve is controlled using the larger magnetic valve of noise to liberation port, influences the rest of patient；Simultaneously when patient flow or pressure
When power demand is smaller, it is impossible to the quick gas for excluding patient's exhalation so that pressure deviate from setting value, shadow when patient exhales
Ring therapeutic effect.
By patent retrieval, following documents are can obtain：
Patent 1：
Application number：CN201110310467.2, the applying date：2011.10.13, applicant:Suzhou Kai Ditai medical science and technologies have
Limit company, publication date：2012.06.20.The utility model discloses a kind of Electromagnetic Control three-way flowrate valve and medical breathing machine,
Electromagnetic Control three-way flowrate valve includes port, liberation port and pneumostome.Admission air valve is provided between port and pneumostome,
Expiration valve is provided between pneumostome and liberation port, admission air valve and expiration valve are adjusted with interaction relation, inlet valve
Door and expiration valve are hollow out cylinder nested structure, including the fixed cylinder and sliding cylinder nested together, admission air valve and are exhaled
The sliding cylinder of air valve is connected with electromagnetic driver, to realize the Synchronization Control to admission air valve and expiration valve opening degree.
Medical breathing machine is connected with after above-mentioned Electromagnetic Control three-way flowrate valve, can be by adjusting opening for admission air valve and expiration valve
Degree of leaving, is controlled to air-breathing and the pressure and flow exhaled, so as to maintain appropriate pressure or stream in air-breathing and expiration phase
Amount, realizes Stress control and the flow control of the double levels of medical breathing machine, simple in construction, easy to use, control is accurate, save work(
Consumption.
Patent 2：
Application number：201410072610.2, the applying date：2014-02-28, applicant:Beijing friendship peace medical system share has
Limit company, publication date：2015-09-02.The utility model discloses a kind of outlet valve and the lung ventilator with it, the outlet valve
Including：Valve body, vapour lock, stainless steel valve port, flap valve diaphragm and bonnet.Inlet channel is formed with valve body and can be connected with inlet channel
Logical outlet passageway, and inlet channel has inlet channel air inlet and inlet channel gas outlet；Vapour lock is located in inlet channel；
Stainless steel valve port is located at the inlet channel gas outlet of valve body, and the inlet channel outlet of one end stretching valve body of stainless steel valve port
Mouthful；Flap valve diaphragm is movably located on valve body between opening and closing the position of stainless steel valve port；Bonnet is located on valve body,
And bonnet coordinates the edge for compressing flap valve diaphragm with valve body, bonnet is provided with through hole.According to the expiration of the utility model embodiment
Valve, improves the sealing property of flap valve diaphragm and stainless steel valve port, and valve port opens and closes accurately and reliably, can accurately calculate and exhale
Air valve incoming call and exhalation tidal volume values, to patient with comfortable breathing pattern.
Patent 3：
Application number：201010562279.4, the applying date：2010.11.21, applicant:Zhejiang jade, which rises medicine equipment share, to be had
Limit company, publication date：2011-03-09.The utility model is related to a kind of control for lung ventilator airline pressure and Flow-rate adjustment
Valve, it includes valve body, valve element, distribution sliding sleeve, motor and blower fan blast pipe, it is characterised in that motor provided with motor anti-vibration sleeve and
Motor set, motor shaft is provided with the outside of magnetosphere and Hall sensor, the valve element and is provided with distribution sliding sleeve, has therebetween certain
It is connected with free gap, distribution sliding sleeve below rack, rack and is provided with guide rail, the rack is meshed with motor gear, distribution is slided
Put provided with alignment sensor and sealing ring and lid, be provided with dividing plate, the valve element of dividing plate both sides and divide in the middle of the hollow valve element
Not She You steam vent and air admission hole, at least provided with two air distribution holes on the same circumference of distribution sliding sleeve, the air distribution hole can be with
Steam vent on valve element is corresponding with air admission hole difference；With it is simple in construction, with low cost, use when noise it is small, safe and reliable,
The advantage of stepless voltage regulation can be realized.
Patent in documents does not disclose the technical scheme of this patent, it is impossible to destroy the novelty of this patent, simultaneously
The combination of above documents can not destroy the creativeness of this patent.
Utility model content
The purpose of this utility model there is provided a kind of high-accuracy ventilation flow rate control system and medical is exhaled for problem above
Suction machine, simple in construction, production cost is low, noise is small, progressively can adjust and maintain to discharge the discharge area of gas, to breathing
The pressure and flow of machine realize accurate control, by pressure and Flow-rate adjustment to optimum state, improve the therapeutic effect of lung ventilator.
To realize object above, the technical solution adopted in the utility model is：
A kind of high-accuracy ventilation flow rate control system, it includes base 1, and its left upper end is provided with threeway seat 3；The threeway
The upper end of seat 3 is provided with threeway 2；The threeway 2 includes air inlet 201, the pneumostome 202 of upper end and the release of right-hand member of left end
Mouth 203；The threeway 2 is fixed on threeway seat 3 by anchor ear 9；The upper right side of the base 1 is provided with electric machine support 4；It is described
The right-hand member of electric machine support 4 is provided with stepper motor 5；The left end of the stepper motor 5 is connected with ball screw 6；The ball wire
Impeller-hub 7 is connected with bar 6；The left end of the impeller-hub 7 is provided with the relative piston 8 connect with liberation port 203；The piston 8
For truncated cone-shaped structure, and to be coaxially disposed between liberation port 203.
Further, the impeller-hub 7 includes left axle section 701 and right axis section 702；The piston 8 is fixed on left axle section 701
Left end；The right-hand member of the right axis section 702 is provided with circular hole 703；The ball screw 6 is arranged in circular hole 703.
Further, the piston 8 is using 35 degree of silica gel, and it includes frustum cone side 801, round platform upper bottom surface 802 and round platform
Bottom surface 803；Multiple air channels 804 being evenly arranged are provided with the frustum cone side 801；The notch of the air channel 804
Size is gradually collapsed to a bit from round platform upper bottom surface 802 to the direction of round platform bottom surface 803.
Further, it is fixed with spring base 13 in the liberation port 203；The spring base 13 includes flange 1302 and connection
In the cylinder 1301 of the left end of flange 1302；Compression spring is provided between the outer wall and the inner-walls of duct of threeway 2 of the cylinder 1301
12；The right-hand member of compression spring 12 is connected with sliding block 11；The sliding block 11 and the inner-walls of duct of threeway 2 contact with each other；The cunning
The right-hand member of block 11 is provided with rubber blanket 10.
Further, the sliding block 11 includes becket 1101 and rubber ring 1102；The rubber ring 1102 is arranged on gold
Belong to the inside of ring 1101, and be in be wholely set with becket 1101；The medial surface of the rubber ring 1102 sets tapered, and should
Taper is consistent with the taper of the frustum cone side of piston 8 to be matched.
Further, the rubber blanket 10 is ring body structurc, and the ring body structurc is by lateral surface 1001, the and of interior right flank 1002
Interior left surface 1003 is constituted；The lateral surface 1001 is fixed on the inwall of threeway 2, its right side and the end face of liberation port 203
Concordantly；The interior right flank 1002 sets tapered, and the taper is consistent with the taper of the frustum cone side of piston 8 matches；In described
The angle of left surface 1003 and horizontal direction is 3~5 °.
Further, the threeway seat 3 is rectangular parallelepiped structure, and its upper end is provided with three for positioning and locking for threeway 2
Logical fixing groove 301.
A kind of medical breathing machine, the medical breathing machine is connected with above-mentioned high-accuracy ventilation flow rate control system, and this is medical to exhale
The gas vent of suction machine is connected with air inlet 201, and the breathing mask of the medical breathing machine is connected with pneumostome 202.
Further, it is provided with pneumatic sensor in the pneumostome 202.
Further, the pneumatic sensor in the pneumostome 202 is electrically connected with the control unit of the stepper motor 5.
The beneficial effects of the utility model：A kind of high-accuracy ventilation flow rate control system and medical that the utility model is provided
Lung ventilator, simple in construction, production cost is low, can be by the frustum cone side and the liberation port end face of threeway of step motor control piston
Between folding and piston frustum cone side and rubber annular conical surface between folding, realize the open loop control of respiratory flow and pressure
System；Discharging the discharge area of gas simultaneously progressively can be adjusted and maintain, and realize and be precisely controlled；Air channel on piston
Setting, contribute to gas uniformly to discharge, at the same have reduction noise effect.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the partial enlarged view A in Fig. 1.
Fig. 3 is the structural representation of impeller-hub and piston in the utility model.
Fig. 4 is the schematic top plan view of piston in the utility model.
Fig. 5 is the cross section view B-B in Fig. 1.
Fig. 6 is the structural representation of threeway seat in the utility model.
Fig. 7 is the structural representation of spring base in the utility model.
Fig. 8 is the structural representation of sliding block in the utility model.
Fig. 9 is the structural representation of rubber blanket in the utility model.
Label character is expressed as described in figure：1st, base；2nd, threeway；3rd, threeway seat；4th, electric machine support；5th, stepper motor；
6th, ball screw；7th, impeller-hub；8th, piston；9th, anchor ear；10th, rubber blanket；11st, sliding block；12nd, compression spring；13rd, spring base；
201st, air inlet；202nd, pneumostome；203rd, liberation port；301st, threeway fixing groove；701st, left axle section；702nd, right axis section；703rd, circle
Hole；801st, frustum cone side；802nd, round platform upper bottom surface；803rd, round platform bottom surface；804th, air channel；1001st, lateral surface；1002nd, it is interior
Right flank；1003rd, interior left surface；1101st, becket；1102nd, rubber ring；1301st, cylinder；1302nd, flange.
Embodiment
In order that those skilled in the art more fully understand the technical solution of the utility model, below in conjunction with the accompanying drawings to this reality
Be described in detail with new, the description of this part be only it is exemplary and explanatory, should not be to protection domain of the present utility model
There is any restriction effect.
As shown in Fig. 1-Fig. 9, concrete structure of the present utility model is：
A kind of high-accuracy ventilation flow rate control system, it includes base 1, and its left upper end is provided with threeway seat 3；The threeway
The upper end of seat 3 is provided with threeway 2；The threeway 2 includes air inlet 201, the pneumostome 202 of upper end and the release of right-hand member of left end
Mouth 203；The threeway 2 is fixed on threeway seat 3 by anchor ear 9；The upper right side of the base 1 is provided with electric machine support 4；It is described
The right-hand member of electric machine support 4 is provided with stepper motor 5；The left end of the stepper motor 5 is connected with ball screw 6；The ball wire
Impeller-hub 7 is connected with bar 6；The left end of the impeller-hub 7 is provided with the relative piston 8 connect with liberation port 203；The piston 8
For truncated cone-shaped structure, and to be coaxially disposed between liberation port 203.
It is preferred that, the impeller-hub 7 includes left axle section 701 and right axis section 702；The piston 8 is fixed on left axle section 701
Left end；The right-hand member of the right axis section 702 is provided with circular hole 703；The ball screw 6 is arranged in circular hole 703.
It is preferred that, the piston 8 is using 35 degree of silica gel, and it is included under frustum cone side 801, round platform upper bottom surface 802 and round platform
Bottom surface 803；Multiple air channels 804 being evenly arranged are provided with the frustum cone side 801；The notch of the air channel 804 is big
It is small gradually to be collapsed to a bit from round platform upper bottom surface 802 to the direction of round platform bottom surface 803.
It is preferred that, it is fixed with spring base 13 in the liberation port 203；The spring base 13 includes flange 1302 and is connected to
The cylinder 1301 of the left end of flange 1302；Compression spring 12 is provided between the outer wall and the inner-walls of duct of threeway 2 of the cylinder 1301；
The right-hand member of compression spring 12 is connected with sliding block 11；The sliding block 11 and the inner-walls of duct of threeway 2 contact with each other；The sliding block 11
Right-hand member be provided with rubber blanket 10.
It is preferred that, the sliding block 11 includes becket 1101 and rubber ring 1102；The rubber ring 1102 is arranged on metal
The inside of ring 1101, and be in be wholely set with becket 1101；The medial surface of the rubber ring 1102 sets tapered, and the cone
Degree is consistent with the taper of the frustum cone side of piston 8 to be matched.
It is preferred that, the rubber blanket 10 is ring body structurc, and the ring body structurc is by lateral surface 1001, interior right flank 1002 and interior
Left surface 1003 is constituted；The lateral surface 1001 is fixed on the inwall of threeway 2, and its right side and the end face of liberation port 203 are put down
Together；The interior right flank 1002 sets tapered, and the taper is consistent with the taper of the frustum cone side of piston 8 matches；The interior left side
1003 and the angle of horizontal direction are 3~5 ° sideways.
It is preferred that, the threeway seat 3 is rectangular parallelepiped structure, and its upper end is provided with the threeway for positioning and locking for threeway 2
Fixing groove 301.
A kind of medical breathing machine, the medical breathing machine is connected with above-mentioned high-accuracy ventilation flow rate control system, and this is medical to exhale
The gas vent of suction machine is connected with air inlet 201, and the breathing mask of the medical breathing machine is connected with pneumostome 202.
It is preferred that, it is provided with pneumatic sensor in the pneumostome 202.
It is preferred that, the pneumatic sensor in the pneumostome 202 is electrically connected with the control unit of the stepper motor 5.
A kind of operation principle when high-accuracy ventilation flow rate control system is exhaled, as shown in figs 1-9, liberation port gas pressure
And flow, in discharge, stepper motor is rotated forward, and ball screw drives impeller-hub and piston to move right, and makes the frustum cone side of piston
Depart from the end face that threeway is located at liberation port, sliding block in the presence of compression spring elastic force, makes rubber while piston moves right
The glue ring moment keeps the frustum cone side with piston to contact with each other and extrude, and gas is released from the air channel of piston；Work as work
When plug continues to move right, sliding block moves right simultaneously, but the interior left surface of sliding block and its right-hand member rubber blanket produces extruding, extruding
The frictional force of generation hinders sliding block to move right so that the speed that sliding block moves right slows down, sliding block and piston while slowing down
Frustum cone side relative movement, progressively increase the area of release gas discharge, gas still discharges by air channel；When piston after
Continuous when moving right, the interior left surface of sliding block and its right-hand member rubber blanket continues to extrude, and the frictional force produced when squeezed is enough to hinder
When keeping off the elastic force of compression spring, sliding block stops movement, and sliding block disconnects with piston, realizes bigger gas release；It can see above
Go out, liberation port gas emissions progressively become big by small, and its pressure is gradually reduced, and reaches accurate control；While the gas of liberation port
In discharge, uniform diffusion is obtained by air channel, noise is reduced；A kind of high-accuracy ventilation flow rate control system air-breathing
When operation principle it is contrary to the above.
A kind of operation principle of medical breathing machine：Gas is provided by the blower fan in medical breathing machine, enters high from air inlet
In accurate ventilation flow rate control system.
When pneumostome offer pressure of inspiration(Pi) is provided, stepper motor reversion, piston is moved to the left, when piston is moved to and threeway
When being fully sealed positioned at liberation port end face, maximum stream flow and pressure feed are realized；To the respirator system of closed-loop control, according to
The forward and reverse for implementing stepper motor can be controlled, be finally reached target by the feedback signal of pneumostome interior air-flow sensor
Pressure and flow.
When needing pneumostome offer breath pressure, stepper motor is rotated forward, and piston moves right, when piston is moved to and threeway
Liberation port when completely disengaging from, realize the release of maximum stream flow and pressure；Equally, to the respirator system of closed-loop control, according to
The forward and reverse for implementing stepper motor can be controlled, be finally reached target by the feedback signal of pneumostome interior air-flow sensor
Pressure and flow.
It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row
His property is included, so that process, method, article or equipment including a series of key elements not only include those key elements, and
And also including other key elements being not expressly set out, or also include for this process, method, article or equipment institute inherently
Key element.
Specific case used herein is set forth to principle of the present utility model and embodiment, above example
Illustrate that being only intended to help understands method of the present utility model and its core concept.Described above is only of the present utility model preferred
Embodiment, it is noted that due to the finiteness of literal expression, and objectively there is unlimited concrete structure, for this technology
For the those of ordinary skill in field, on the premise of the utility model principle is not departed from, some improvement, retouching can also be made
Or change, above-mentioned technical characteristic can also be by rights combined；These improve retouching, change or combined, or not
It is improved that the design of utility model and technical scheme are directly applied into other occasions, it is regarded as protection of the present utility model
Scope.
Claims (10)
1. a kind of high-accuracy ventilation flow rate control system, it is characterised in that it includes base (1), its left upper end is provided with threeway
Seat (3)；The upper end of the threeway seat (3) is provided with threeway (2)；The threeway (2) includes the air inlet (201) of left end, upper end
Pneumostome (202) and right-hand member liberation port (203)；The threeway (2) is fixed on threeway seat (3) by anchor ear (9)；It is described
The upper right side of base (1) is provided with electric machine support (4)；The right-hand member of the electric machine support (4) is provided with stepper motor (5)；It is described
The left end of stepper motor (5) is connected with ball screw (6)；Impeller-hub (7) is connected with the ball screw (6)；It is described to promote
The left end of axle (7) is provided with the relative piston (8) connect with liberation port (203)；The piston (8) is truncated cone-shaped structure, and with releasing
Put between mouth (203) to be coaxially disposed.
2. a kind of high-accuracy ventilation flow rate control system according to claim 1, it is characterised in that the impeller-hub (7)
Including left axle section (701) and right axis section (702)；The piston (8) is fixed on the left end of left axle section (701)；The right axis section
(702) right-hand member is provided with circular hole (703)；The ball screw (6) is arranged in circular hole (703).
3. a kind of high-accuracy ventilation flow rate control system according to claim 1, it is characterised in that piston (8) bag
Include frustum cone side (801), round platform upper bottom surface (802) and round platform bottom surface (803)；It is provided with the frustum cone side (801) many
The individual air channel (804) being evenly arranged；The notch size of the air channel (804) is gone to the bottom from round platform upper bottom surface (802) to round platform
The direction in face (803) is gradually collapsed to a bit.
4. a kind of high-accuracy ventilation flow rate control system according to claim 3, it is characterised in that the liberation port
(203) spring base (13) is fixed with；The spring base (13) includes flange (1302) and is connected to flange (1302) left end
Cylinder (1301)；Compression spring (12) is provided between the outer wall and threeway (2) inner-walls of duct of the cylinder (1301)；The pressure
Contracting spring (12) right-hand member is connected with sliding block (11)；The sliding block (11) and the inner-walls of duct of threeway (2) contact with each other；The sliding block
(11) right-hand member is provided with rubber blanket (10).
5. a kind of high-accuracy ventilation flow rate control system according to claim 4, it is characterised in that sliding block (11) bag
Include becket (1101) and rubber ring (1102)；The rubber ring (1102) is arranged on the inside of becket (1101), and with gold
Category ring (1101) is in be wholely set；The medial surface of the rubber ring (1102) sets tapered, and the taper and piston (8) round platform
The taper of side is unanimously matched.
6. a kind of high-accuracy ventilation flow rate control system according to claim 5, it is characterised in that the rubber blanket (10)
For ring body structurc, the ring body structurc is made up of lateral surface (1001), interior right flank (1002) and interior left surface (1003)；It is described outer
(1001) are fixed on the inwall of threeway (2) sideways, and its right side is concordant with the end face of liberation port (203)；The interior right flank
(1002) set tapered, and the taper is consistent with the taper of piston (8) frustum cone side matches；The interior left surface (1003) with
The angle of horizontal direction is 3~5 °.
7. a kind of high-accuracy ventilation flow rate control system according to claim 1, it is characterised in that the threeway seat (3)
For rectangular parallelepiped structure, its upper end is provided with the threeway fixing groove (301) for positioning and locking for threeway (2).
8. a kind of medical breathing machine, it is characterised in that the medical breathing machine is connected with claim 1-7 described in any one
High-accuracy ventilation flow rate control system, the gas vent of the medical breathing machine is connected with air inlet (201), the medical breathing machine
Breathing mask is connected with pneumostome (202).
9. a kind of medical breathing machine according to claim 8, it is characterised in that be provided with gas in the pneumostome (202)
Flow sensor.
10. a kind of medical breathing machine according to claim 9, it is characterised in that the air-flow in the pneumostome (202) is passed
Sensor is electrically connected with the control unit of the stepper motor (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621150355.XU CN206424395U (en) | 2016-10-24 | 2016-10-24 | A kind of high-accuracy ventilation flow rate control system and medical breathing machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621150355.XU CN206424395U (en) | 2016-10-24 | 2016-10-24 | A kind of high-accuracy ventilation flow rate control system and medical breathing machine |
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ID=59588400
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106267497A (en) * | 2016-10-24 | 2017-01-04 | 湖南万脉医疗科技有限公司 | A kind of high-accuracy ventilation flow rate control system and medical breathing machine |
| CN110064115A (en) * | 2019-06-10 | 2019-07-30 | 常州市第一人民医院 | A kind of frequency regulating valve for ventilator |
| CN110064116A (en) * | 2019-06-10 | 2019-07-30 | 常州市第一人民医院 | A kind of high-accuracy gas flow optimized flow control valve used for respirators |
-
2016
- 2016-10-24 CN CN201621150355.XU patent/CN206424395U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106267497A (en) * | 2016-10-24 | 2017-01-04 | 湖南万脉医疗科技有限公司 | A kind of high-accuracy ventilation flow rate control system and medical breathing machine |
| CN106267497B (en) * | 2016-10-24 | 2018-10-23 | 湖南万脉医疗科技有限公司 | A kind of high-accuracy ventilation flow rate control system and medical breathing machine |
| CN110064115A (en) * | 2019-06-10 | 2019-07-30 | 常州市第一人民医院 | A kind of frequency regulating valve for ventilator |
| CN110064116A (en) * | 2019-06-10 | 2019-07-30 | 常州市第一人民医院 | A kind of high-accuracy gas flow optimized flow control valve used for respirators |
| CN110064116B (en) * | 2019-06-10 | 2020-02-21 | 常州市第一人民医院 | High-precision flow control valve for airflow control respirator |
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