CN101584897A - Anesthesia gas circuit adopting pneumatic valve and reversing valve - Google Patents
Anesthesia gas circuit adopting pneumatic valve and reversing valve Download PDFInfo
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- CN101584897A CN101584897A CNA2008101124383A CN200810112438A CN101584897A CN 101584897 A CN101584897 A CN 101584897A CN A2008101124383 A CNA2008101124383 A CN A2008101124383A CN 200810112438 A CN200810112438 A CN 200810112438A CN 101584897 A CN101584897 A CN 101584897A
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Abstract
The invention discloses an anesthesia gas circuit adopting a pneumatic valve and a reversing valve, which comprises an oxygen source input port (21), a laughing gas source input port (18), a standby laughing gas source input port (19), a one way valve (20), a reducing valve (24), a pressure gauge (23), the pneumatic valve (1), the reversing valve (9), a flow control valve (22) and the like. The laughing gas source input port (18) and the standby laughing gas source input port (19) are respectively connected with a gas inlet 1 (13) and a gas inlet 2 (14) of the reversing valve (9); a gas outlet (17) of the reversing valve (9) is connected with a gas inlet (1-1) of the pneumatic valve (1); and the output of laughing gas is regulated by the pressure of oxygen. The anesthesia gas circuit has simple structure, stability, and stable performance, and can provide oxygen and laughing gas mixture according to preset concentration.
Description
Technical field
The present invention relates to use the equipment of laughing gas, especially adopt the anesthesia gas circuit armarium of pneumatic operated valve and reversal valve.Belong to armarium manufacturing technology field.
Background technology
Anesthetic machine is the undergo surgery important tool of general anesthesia of modern hospital, and its major function is to suck anesthesia, oxygen supply and auxiliary or control breathing are provided for patient.For the anesthetic machine that uses laughing gas for anesthesia gas, its anesthesia gas circuit comprises input, flow-control, the oxygen of oxygen, laughing gas, the mixing of laughing gas, and the concentration of setting according to the anaesthetist flows to patient at last.
In order to protect medical care and patient's safety; whenever in the safety of anesthesiaing system with key property is special-purpose the use of laughing gas is had strict standard code in requiring: the anesthetic gases induction system should be designed to be reduced to the minimum of manufacturer's regulation and oxygen continuously when common gas outlet flows out in oxygen supply, and the oxygen concentration of carrying at common gas outlet should not be lower than 19%.
So laughing gas must be controlled by oxygen as driven gas, require to provide a kind of safe, reliable, stable performance, anesthesia gas circuit easy to use clinically.
In addition, for security consideration, anesthesia gas circuit all requires to be equipped with bailout gas to every kind of source of the gas.Generally speaking, every kind of source of the gas and bailout gas thereof are all by the anesthesia gas circuit that inserts directly in parallel behind the check valve.Also be provided with Pressure gauge in the anesthesia gas circuit, with the situation of indication air feed.
But, because laughing gas is controlled by oxygen as driven gas, often after cutting off the laughing gas source of the gas, the gas of laughing gas check valve rear end can't discharge, the Pressure gauge that is located at laughing gas check valve rear end can not be made zero, thereby can not correctly indicate the working condition of laughing gas source end, be unfavorable for that the doctor judges and use next time, also be unfavorable for manometric working condition.
Summary of the invention
In order to guarantee to provide oxygen, laughing gas mist to patient according to the concentration that the anaesthetist sets, the least concentration of oxygen is not less than 19%, satisfies laughing gas as the requirement of driven gas by oxygen control; Simultaneously, in order to overcome the defective that the Pressure gauge that is located at laughing gas check valve rear end in the existing anesthesia gas circuit can not make zero, the invention provides the anesthesia gas circuit that adopts pneumatic operated valve and reversal valve.
The structural representation of pneumatic operated valve is seen Fig. 1; Reversal valve can be by spool displacement which air inlet of method control reversal valve be communicated with the gas outlet, the employing piston is that the structural representation of the reversal valve of spool is seen Fig. 2.
Referring to accompanying drawing, the anesthesia gas circuit scheme of employing pneumatic operated valve of the present invention and reversal valve is as follows:
Adopt the anesthesia gas circuit of pneumatic operated valve and reversal valve, comprising:
Oxygen source input port, laughing gas source of the gas input port, laughing gas bailout gas input port, check valve, air relief valve, Pressure gauge, pneumatic operated valve, reversal valve, flow control valve etc.;
Reversal valve is provided with change valve, valve gap 1, valve gap 2, piston, fastening and sealing member; Change valve is provided with gas outlet, valve gap 1 and is provided with that air inlet 1, valve gap 2 are provided with air inlet 2, fastening and sealing member provides the fastening of reversal valve and sealing;
The piston two ends are communicated with air inlet 1, air inlet 2 respectively, under the gas pressure of air inlet 1, air inlet 2, can move, and air inlet that pressure is bigger and gas outlet connection.For example: when the gas pressure of air inlet 1 during, will promote piston and move it air inlet 2 one sides, and block air inlet 2, air inlet 2 and gas outlet are closed greater than air inlet 2; Air inlet 1 is connected with the gas outlet simultaneously.
Laughing gas source of the gas input port, laughing gas bailout gas input port connect air inlet 1, the air inlet 2 of reversal valve respectively; The gas outlet of reversal valve connects the gas access of pneumatic operated valve, and is provided with Pressure gauge in this position;
Pneumatic operated valve is provided with gas access, gas outlet and valve inner passage port, and the valve inner passage port is between gas access and gas outlet; The gas access connects the gas outlet of reversal valve, and gas outlet is the outfan of laughing gas, is connected to flow control valve; Pneumatic operated valve also is provided with a control port, connects oxygen source.
Be provided with diaphragm in the pneumatic operated valve, diaphragm can upper and lower displacement, and drives spool and move, and changes the size that the valve inner passage port is opened; The spool other end is provided with spring, and the normality bottom spool is subjected to the compression force of spring and is pressed on the valve inner passage port, makes the valve inner passage port be in closed condition.
The size that the big or small control valve inner passage port of oxygen source pressure is opened, thereby the connection of control gas access and gas outlet size degree; When oxygen pressure is lower than setting value, the valve inner passage port is closed, thereby cut off the laughing gas source of the gas automatically.The output of laughing gas is regulated by the oxygen pressure of control port, guarantees that laughing gas pressure changes in proportion along with the variation of oxygen pressure, guarantee oxygen in the concentration of gas outlet all the time greater than 19%.
After oxygen enters check valve, air relief valve by the oxygen source input port, the oxygen intake of access flow control valve in parallel and the control port of pneumatic operated valve;
After mixing, the concentration of setting according to the anaesthetist flows to patient at flow control valve for oxygen, laughing gas.
During work, when not inserting the laughing gas bailout gas, the laughing gas source of the gas because the pressure effect makes piston move, is blocked air inlet 2 by the air inlet 1 of laughing gas source of the gas input port connection reversal valve, and air inlet 1 and gas outlet are connected; The laughing gas source of the gas outputs to the gas access of pneumatic operated valve;
In the time need switching to the laughing gas bailout gas because of reasons such as laughing gas air failures, the laughing gas bailout gas is by the air inlet 2 of laughing gas bailout gas input port connection reversal valve, and the pressure of air inlet 2 is greater than the pressure of air inlet 1; Because the pressure effect makes piston move, and blocks air inlet 1, and with air inlet 2 and gas outlet connection; The laughing gas bailout gas outputs to the gas access of pneumatic operated valve;
Be located at the Pressure gauge indication laughing gas source of the gas at reversal valve gas outlet and pneumatic operated valve gas access place or the working condition of laughing gas bailout gas end.
When closing oxygen source and laughing gas source of the gas successively, pneumatic operated valve also cuts off laughing gas source of the gas and laughing gas bailout gas when cutting out oxygen source, and the gas between reversal valve and the pneumatic operated valve can oppositely discharge by reversal valve, makes Pressure gauge make zero;
Perhaps, when closing oxygen source and laughing gas source of the gas successively, pneumatic operated valve also cuts off laughing gas source of the gas and laughing gas bailout gas when cutting out oxygen source, and makes laughing gas source of the gas input port and laughing gas bailout gas input port connect atmosphere; Gas between reversal valve and the pneumatic operated valve can oppositely discharge by reversal valve, makes Pressure gauge make zero.
The anesthesia gas circuit of employing pneumatic operated valve of the present invention and reversal valve, laughing gas is controlled by oxygen as driven gas, anesthesia gas circuit is simple in structure, safe, reliable, stable performance, easy to use, and can realize provides the purpose of oxygen, laughing gas mist according to setting concentration.The present invention has also solved the defective that Pressure gauge that existing anesthesia gas circuit inserts can not make zero between laughing gas check valve and pneumatic operated valve, realized the working condition of correct indication laughing gas source of the gas or laughing gas bailout gas end, helped application clinically and improve manometric working condition.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, but and the unrestricted scope of application of the present invention.
Fig. 1 is the structural representation of pneumatic operated valve;
Fig. 2 is that piston is the structural representation of the reversal valve of spool;
Fig. 3 is existing laughing gas source of the gas and bailout gas thereof insert anesthesia gas circuit by a check valve back directly in parallel work sketch map;
Fig. 4 is the work sketch map of the present invention's anesthesia gas circuit of adopting pneumatic operated valve and reversal valve.
Among the figure: pneumatic operated valve (1), pneumatic operated valve valve body (2), valve seat (3), diaphragm (4), spool (5), sealing ring (6), spring (7), bonnet (8), gas access (1-1), gas outlet (1-2), control port (1-3), valve inner passage port (1-4), reversal valve (9), change valve (10), valve gap 1 (11), air inlet 1 (13), valve gap 2 (12), air inlet 2 (14), piston (15), fastening and sealing member (16), gas outlet (17), laughing gas source of the gas input port (18), laughing gas bailout gas input port (19), check valve (20), oxygen source input port (21), flow control valve (22), Pressure gauge (23), air relief valve (24).
Among Fig. 1: pneumatic operated valve (1) comprises air-operated valve (2), valve seat (3), bonnet (8); Gas Moving valve (1) is provided with gas access (1-1), gas vent (1-2) and valve inner passage port (1-4); In the valve Port (1-4) is positioned between gas access (1-1) and the gas vent (1-2); Gas access (1-1) Connect laughing gas source of the gas input port (18), gas vent (1-2) is the output of laughing gas; Pneumatic operated valve (1) Also be provided with a control port (1-3), control port (1-3) connects with oxygen source input port (21) Logical. Be provided with diaphragm (4) in the pneumatic operated valve (1), diaphragm (4) can upper and lower displacement, and band movable valve plug (5) Mobile, change the size that valve inner passage port (1-4) is opened; Spool (5) other end is provided with spring (7), Normality bottom spool (5) is subjected to the compression force of spring (7) and is pressed on the valve inner passage port (1-4), makes Valve inner passage port (1-4) is in closed condition.
During work, the oxygen of certain pressure (usually greater than preset value) is advanced by control port (1-3) Enter in the valve seat (3), the compression stress that overcomes spring (7) moves up diaphragm (4), diaphragm (4) Drive spool (5) to top offset and move up, change the size that valve inner passage port (1-4) is opened, make The laughing gas that (1-1) enters valve body (2) from the gas access through valve inner passage port (1-4) from gas vent (1-2) Output. The size of control port (1-3) oxygen pressure has determined the amount of diaphragm (4) displacement; Diaphragm (4) band movable valve plug (5) has determined the size that valve inner passage port (1-4) is opened to the amount of top offset, continues And the control gas that (1-1) enters from the gas access is from the output quantity of gas vent (1-2).
When oxygen pressure during less than preset value, can not overcome the compression stress of spring (7), diaphragm (4) Can not be to top offset, perhaps diaphragm (4) all makes valve inner passage port (1-4) close to bottom offset. Cause This gas access (1-1) and gas vent (1-2) are obstructed, even if laughing gas is arranged from the gas access (1-1) Enter in the air-operated valve (2) and can not export from gas vent (1-2).
In Fig. 3, laughing gas source of the gas input port (18), laughing gas bailout gas input port (19) are respectively Connect the gas access of pneumatic operated valve (1) through check valve (20), and be provided with Pressure gauge in this position (23); After cutting off the laughing gas source of the gas, because the gas between check valve (20) and the pneumatic operated valve (1) can't Discharge, thereby Pressure gauge (23) can not be made zero.
In Fig. 4, laughing gas source of the gas input port (18), laughing gas bailout gas input port (19) are respectively The air inlet 1 (13), the air inlet 2 (14) that connect reversal valve (9); The gas outlet of reversal valve (9) (17) gas access (1-1) of connection pneumatic operated valve (1) is from gas vent (1-2) output, incoming stream The laughing gas entrance of control valve (22); The gas outlet (17) of reversal valve (9) is provided with Pressure gauge (23); After oxygen passes through check valve (20), pressure-reducing valve (24) from oxygen source input port (21), and connect The control port (1-3) of the oxygen intake of inbound traffics control valve (22) and pneumatic operated valve (1) is by gas The output pressure of control port (1-3) the interlock control laughing gas of moving valve (1).
Oxygen, laughing gas, are failed according to the concentration that the anesthetist sets after mixing at flow control valve (22) Give patient.
When closing successively oxygen source and laughing gas source of the gas, pneumatic operated valve (1) is cutting out the same of oxygen source The time also cut off laughing gas source of the gas and laughing gas bailout gas, the gas between reversal valve (9) and the pneumatic operated valve (1) Can pass through reversal valve (9) and oppositely discharge, so that Pressure gauge (23) makes zero.
The specific embodiment
Adopt the anesthesia gas circuit of pneumatic operated valve and reversal valve, comprising:
Oxygen source input port (21), laughing gas source of the gas input port (18), laughing gas bailout gas input port (19), check valve (20), air relief valve (24), Pressure gauge (23), pneumatic operated valve (1), reversal valve (9), flow control valve (22);
Reversal valve (9) is provided with change valve (10), valve gap 1 (11), valve gap 2 (12), piston (15), fastening and sealing member (16); Change valve (10) is provided with gas outlet (17), valve gap 1 (11) and is provided with that air inlet 1 (13), valve gap 2 (12) are provided with air inlet 2 (14), fastening and sealing member (16) provides the fastening of reversal valve (9) and sealing;
Piston (15) two ends are communicated with air inlet 1 (13), air inlet 2 (14) respectively, under the gas pressure of air inlet 1 (13), air inlet 2 (14), can move, and the air inlet that pressure is bigger and gas outlet (17) connection.
Laughing gas source of the gas input port (18), laughing gas bailout gas input port (19) connect air inlet 1 (13), the air inlet 2 (14) of reversal valve (9) respectively; The gas outlet (17) of reversal valve (9) connects the gas access (1-1) of pneumatic operated valve (1), and is provided with Pressure gauge (23) in this position;
Pneumatic operated valve (1) is provided with gas access (1-1), gas outlet (1-2) and valve inner passage port (1-4), and valve inner passage port (1-4) is positioned between gas access (1-1) and the gas outlet (1-2); Gas access (1-1) connects the gas outlet (17) of reversal valve (9), and gas outlet (1-2) is the outfan of laughing gas, is connected to flow control valve (22); Pneumatic operated valve (1) is provided with control port (1-3), and control port (1-3) connects oxygen source.
Be provided with diaphragm (4) in the pneumatic operated valve (1), diaphragm (4) can upper and lower displacement, and drives spool (5) and move, and changes the size that valve inner passage port (1-4) is opened; Spool (5) other end is provided with spring (7), and normality bottom spool (5) is subjected to the compression force of spring (7) and is pressed on the valve inner passage port (1-4), makes valve inner passage port (1-4) be in closed condition.
The size that the big or small control valve inner passage port (1-4) of oxygen source pressure is opened, thereby the connection of control gas access (1-1) and gas outlet (1-2) size degree; When oxygen pressure is lower than setting value, valve inner passage port (1-4) is closed, thereby cut off the laughing gas source of the gas automatically.The output of laughing gas is regulated by the oxygen pressure of control port (1-3), guarantees that laughing gas pressure changes in proportion along with the variation of oxygen pressure, guarantee oxygen in the concentration of gas outlet (1-2) all the time greater than 19%.
After oxygen enters check valve (20), air relief valve (24) by oxygen source input port (21), the control port (1-3) of the oxygen intake of access flow control valve in parallel (22) and pneumatic operated valve (1);
After mixing, the concentration of setting according to the anaesthetist flows to patient at flow control valve (22) for oxygen, laughing gas.
During work, when not inserting the laughing gas bailout gas, the laughing gas source of the gas is by the air inlet 1 (13) of laughing gas source of the gas input port (18) connection reversal valve (9), because the pressure effect makes piston (15) move, block air inlet 2 (14), and air inlet 1 (13) and gas outlet (17) are connected; The laughing gas source of the gas outputs to the gas access (1-1) of pneumatic operated valve (1);
In the time need switching to the laughing gas bailout gas because of reasons such as laughing gas air failures, the laughing gas bailout gas is by the air inlet 2 (14) of laughing gas bailout gas input port (19) connection reversal valve (9), and the pressure of air inlet 2 (14) is greater than the pressure of air inlet 1 (13); Because the pressure effect makes piston (15) move, and blocks air inlet 1 (13), and air inlet 2 (14) and gas outlet (17) are connected; The laughing gas bailout gas outputs to the gas access (1-1) of pneumatic operated valve (1);
When closing oxygen source and laughing gas source of the gas successively, pneumatic operated valve (1) also cuts off laughing gas source of the gas and laughing gas bailout gas when cutting out oxygen source, gas between reversal valve (9) and the pneumatic operated valve (1) can pass through reversal valve (9) and oppositely discharge, and makes Pressure gauge (23) make zero.
During pneumatic operated valve work, oxygen with certain pressure (usually greater than preset value) is entered in the valve seat (3) by control port (1-3), the compression stress that overcomes spring (7) moves up diaphragm (4), moving up of diaphragm (4) to top offset drive spool (5), change the size that valve inner passage port (1-4) is opened, the laughing gas that makes from the gas access (1-1) enter valve body (2) is exported from gas outlet (1-2) through valve inner passage port (1-4).The size of control port (1-3) oxygen pressure has determined the amount of diaphragm (4) displacement; Diaphragm (4) drives the amount of spool (5) to top offset, has determined the size that valve inner passage port (1-4) is opened, and controls (1-1) enters from the gas access the gas output from gas outlet (1-2) then.
When oxygen pressure during less than preset value, can not overcome the compression stress of spring (7), diaphragm (4) can not all make valve inner passage port (1-4) close to top offset or diaphragm (4) to bottom offset.Therefore gas access (1-1) and gas outlet (1-2) are obstructed, and (1-1) enters in the valve body (2) and can not export from gas outlet (1-2) from the gas access even if laughing gas is arranged.
As the employing pneumatic operated valve of embodiment 1 and the anesthesia gas circuit of reversal valve, but described pneumatic operated valve (1) also cuts off laughing gas source of the gas and laughing gas bailout gas when cutting out oxygen source, and makes laughing gas source of the gas input port (18) and laughing gas bailout gas input port (19) connect atmosphere.
Claims (2)
1, adopts the anesthesia gas circuit of pneumatic operated valve and reversal valve, comprise oxygen source input port (21), laughing gas source of the gas input port (18), laughing gas bailout gas input port (19), check valve (20), air relief valve (24), Pressure gauge (23), flow control valve (22), it is characterized in that:
Anesthesia gas circuit also is provided with pneumatic operated valve (1), reversal valve (9);
Pneumatic operated valve (1) comprising: pneumatic operated valve valve body (2), valve seat (3), bonnet (8);
Reversal valve (9) is provided with change valve (10), valve gap 1 (11), valve gap 2 (12), piston (15), fastening and sealing member (16);
Change valve (10) is provided with that gas outlet (17), valve gap 1 (11) are provided with air inlet 1 (13), valve gap 2 (12) is provided with air inlet 2 (14);
Piston (15) two ends are communicated with air inlet 1 (13), air inlet 2 (14) respectively;
Laughing gas source of the gas input port (18), laughing gas bailout gas input port (19) connect air inlet 1 (13), the air inlet 2 (14) of reversal valve (9) respectively; The gas outlet (17) of reversal valve (9) connects the gas access (1-1) of pneumatic operated valve (1), and is provided with Pressure gauge (23) in this position;
Pneumatic operated valve (1) is provided with gas access (1-1), gas outlet (1-2) and valve inner passage port (1-4), and valve inner passage port (1-4) is positioned between gas access (1-1) and the gas outlet (1-2);
Gas access (1-1) connects the gas outlet (17) of reversal valve (9), and gas outlet (1-2) is connected to flow control valve (22);
Pneumatic operated valve (1) is provided with control port (1-3), and control port (1-3) connects oxygen source;
Be provided with diaphragm (4) in the pneumatic operated valve (1), diaphragm (4) can upper and lower displacement, and drives spool (5) and move;
Spool (5) other end is provided with spring (7), and normality bottom spool (5) is subjected to the compression force of spring (7) and is pressed on the valve inner passage port (1-4);
Oxygen source input port (21) connects check valve (20), air relief valve (24) successively, the oxygen intake of flow control valve (22) and the control port (1-3) of pneumatic operated valve (1) connected in parallel again.
2, the anesthesia gas circuit of employing pneumatic operated valve according to claim 1 and reversal valve, it is characterized in that described pneumatic operated valve (1) also cuts off laughing gas source of the gas and laughing gas bailout gas when cutting out oxygen source, and make laughing gas source of the gas input port (18) and laughing gas bailout gas input port (19) connect atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101124383A CN101584897A (en) | 2008-05-23 | 2008-05-23 | Anesthesia gas circuit adopting pneumatic valve and reversing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101124383A CN101584897A (en) | 2008-05-23 | 2008-05-23 | Anesthesia gas circuit adopting pneumatic valve and reversing valve |
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| CN101584897A true CN101584897A (en) | 2009-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008101124383A Pending CN101584897A (en) | 2008-05-23 | 2008-05-23 | Anesthesia gas circuit adopting pneumatic valve and reversing valve |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102266637A (en) * | 2010-12-31 | 2011-12-07 | 北京谊安医疗系统股份有限公司 | Pneumatic control valve for anesthesia machine |
| CN103182133A (en) * | 2011-12-30 | 2013-07-03 | 北京谊安医疗系统股份有限公司 | Method and structural component for realizing continuous positive airway pressure mode on anaesthesia machine or respirator |
| CN103182129A (en) * | 2011-12-30 | 2013-07-03 | 北京谊安医疗系统股份有限公司 | By-pass valve |
| CN103462704A (en) * | 2013-09-23 | 2013-12-25 | 苏州华恒医用器械有限公司 | Joint valve |
| CN103463736A (en) * | 2013-09-23 | 2013-12-25 | 苏州华恒医用器械有限公司 | Anti-suck-back water control valve |
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2008
- 2008-05-23 CN CNA2008101124383A patent/CN101584897A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102266637A (en) * | 2010-12-31 | 2011-12-07 | 北京谊安医疗系统股份有限公司 | Pneumatic control valve for anesthesia machine |
| CN102266637B (en) * | 2010-12-31 | 2013-08-14 | 北京谊安医疗系统股份有限公司 | Pneumatic control valve for anesthesia machine |
| CN103182133A (en) * | 2011-12-30 | 2013-07-03 | 北京谊安医疗系统股份有限公司 | Method and structural component for realizing continuous positive airway pressure mode on anaesthesia machine or respirator |
| CN103182129A (en) * | 2011-12-30 | 2013-07-03 | 北京谊安医疗系统股份有限公司 | By-pass valve |
| WO2013097688A1 (en) * | 2011-12-30 | 2013-07-04 | 北京谊安医疗系统股份有限公司 | Transfer valve |
| US8967194B2 (en) | 2011-12-30 | 2015-03-03 | Beijing Aeonmed Co., Ltd. | Bypass valve |
| CN103182129B (en) * | 2011-12-30 | 2015-12-09 | 北京谊安医疗系统股份有限公司 | Bypass valve |
| EA025719B1 (en) * | 2011-12-30 | 2017-01-30 | Бейджин Аеонмед Ко., Лтд. | Bypass valve |
| CN103462704A (en) * | 2013-09-23 | 2013-12-25 | 苏州华恒医用器械有限公司 | Joint valve |
| CN103463736A (en) * | 2013-09-23 | 2013-12-25 | 苏州华恒医用器械有限公司 | Anti-suck-back water control valve |
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Open date: 20091125 |