JPH0482565A - Protector for drop in concentration of oxygen for gas feeder - Google Patents

Abstract

PURPOSE:To make a protector for drop in concentration of oxygen compact with the integration of the protector with a flowmeter by adjusting a flow rate of O2 with an oxygen flow regulating valve interlocking an oxygen flow rate adjusting mechanism and a laughing gas choking mechanism and a flow rate of N2O with the laughing gas choking mechanism and a laughing gas flow regulating valve. CONSTITUTION:A second valve body 62 is retreated sufficiently from a step 33c while a first valve body 39 is retreated sufficiently from a valve box 34. As a result, a laughing gas flows freely into a laughing gas passage 61 at a laughing gas flow inlet 49 and flows out at a laughing gas outflow port 67 to enter a flowmeter 7 sufficiently. At the same time, oxygen flows freely into an oxygen passage 43 at an oxygen flow inlet 47 to enter the flowmeter 7 sufficiently. Under such a condition, the valve box 34 is turned to fix a position of the valve box 34 to a gas flow regulator body 31 so that the concentration of O2 stays at 30% with the flowmeter 7. This secures 30% as a specified minimum concentration of O2.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a protection device for oxygen concentration drop in a gas supply device that is safe, has good operability, and is compact.

``Prior Art'' As is well known, an anesthesia machine includes a gas supply unit that supplies anesthetic gas that is a mixture of laughing gas (N, O) and oxygen gas (01), and a It consists of a breathing circuit section that properly delivers gas to the patient. In the anesthesia machine,
If only N and O flow when supplying anesthetic gas, oxygen deficiency will occur, which is dangerous.
, 30% even if the O flow rate is restricted and the N and O supply passages are fully opened.
0. is flowing.

As shown in FIG. 2, this anesthesia machine includes a gas supply section 1,
It is composed of a breathing circuit section 2. These gas supply section 1 and breathing circuit section 2 are communicated through one connecting pipe 3.

This connecting pipe 3 is connected to an anesthetic gas supply pipe 4 in the gas supply section 1.
and the oxygen rapid supply pipe 5.

A vaporizer 6 is interposed in the middle of one anesthetic gas supply pipe 4, and a flow meter 7 is connected to the tip thereof.

The flow meter 7 has two branched pipes 7a and 7b so that the flow rates of oxygen gas (○,) and laughing gas (N, O) can be measured, and each pipe has a pipe shown in Fig. 3. A cylinder or a hospital's medical gas piping equipment can be connected via the flow rate adjustment valve 8. The other rapid oxygen supply pipe 5 is connected to the OT pipe of the flow meter 7.

It is connected to a supply pipe that connects to a gas source, and a flush valve 9 is installed in the middle of the supply pipe.

In the flow rate regulating valve 8 of the gas supply section 1 of the anesthesia machine having the above configuration, as shown in FIG.
Up to l1n, Q, passes through passage 12, and 0! It flows out from the outlet 13 and flows into the pipe 7a of the flowmeter 7 through the pipe 13a. Pressure increases.

■See you again! ○N and O flowing from entrance 15 are in passage 1
6. Passes through the orifice 4s 17 and flows out from the N and O exits 18,
It passes through the pipe 18a and flows into the pipe 7b of the flow meter 7.

The valve shaft 19a of the diaphragm valve 19 can be turned to adjust the maximum flow rate of N and ○, and the valve shaft 22a of the diaphragm valve 22 can be turned to adjust the maximum flow rate of N and 0. 0 at the point when the flow begins. It is now possible to increase the flow rate.

In addition, a flow meter has a float placed inside a glass tube with a scale, and when gas is flowed, the float stops when the gas pressure and the float's gravity are balanced. There is.

This prevents the float from touching the glass tube and causing friction.

"Problems to be Solved by the Invention" However, the gas supply section 1 of the anesthesia machine having the above configuration had the following problems.

l) When the O1 pressure exceeds a predetermined pressure, O1 pushes up the diaphragm valve 19 and flows into the passage 20, and this flow is directly transmitted to the float of the flowmeter, causing a rapid increase in the flow rate.

2) O again! When the pressure decreases and the flow rate is below 3ρ/main, the diaphragm valve 19 closes and the O flows to the flow meter.
1 The flow rate drops rapidly.

3) When the needle valve 21 is closed, the 0. When the pressure is removed and the diaphragm valve 22 is closed, and then the needle valve 23 is closed, the diaphragm valve 22 is removed from the needle valve 23.
A pressure of 3 to 3.5 kg/cm'' of N and O remains in the pipes leading up to the pipe.

4) When the needle valve 2I is opened again, the pressure in the O passage increases, pushing up the diaphragm valve 22 and opening the needle valve 2.
Several ma of N and O flow from the diaphragm valve 22 to the diaphragm valve 22, but since this has pressure, it flows to the flow meter and causes the float to jump up to the scale of about 9ρ/+l1in, making the doctor feel uneasy.

5) Since the flow rate regulating valve 8 must be separately attached to the flow meter via piping, there are problems in that it takes up space, the piping is complicated, manufacturing costs are high, and leaks are likely to occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide an oxygen concentration drop protection device for a gas supply device that solves the above-mentioned problems of conventional devices.

"Means for Solving the Problems" In order to achieve the above object, the present invention has the following configuration. That is, in a gas supply device that measures each gas flow rate from a laughing gas source and an oxygen gas source and supplies anesthetic gas at a predetermined concentration, the gas flow rate regulator body and the gas flow lR
an oxygen flow path formed in a regulator body and communicating an oxygen inlet and an oxygen outlet provided in the gas flow regulator body;
an oxygen flow rate adjustment valve provided between the oxygen inlet and the oxygen outlet so as to be able to freely adjust the cross-sectional area of the oxygen flow path; and an oxygen flow rate adjustment valve formed within the gas flow rate regulator body; A laughing gas flow path that communicates a laughing gas inlet and a laughing gas outlet is provided between the laughing gas inlet and the laughing gas outlet so that the cross-sectional area of the laughing gas flow path can be freely adjusted. and a laughing gas flow rate adjustment valve, and when the laughing gas inlet and the laughing gas flow rate adjustment valve are opened, the cross-sectional area of the laughing gas flow path is adjusted to the oxygen flow 1 in conjunction with the operation of the adjustment valve. A freely adjustable laughing gas throttling mechanism and an opening degree adjustment of the oxygen flow rate adjusting valve to which the laughing gas restricting mechanism is interlocked are capable of freely adjusting the opening degree of the oxygen flow rate adjusting valve. An oxygen flow rate adjustment 'R structure provided in the regulator body is provided.

"Action" According to the above configuration, 0. The concentration is determined by the adjustment between the oxygen flow rate adjustment mechanism and the laughing gas throttle mechanism, and these adjustments automatically ensure ○ and the concentration of 30%.O1 flow rate adjustment is determined by the oxygen flow rate adjustment mechanism and the laughing gas throttle mechanism. It is adjusted by adjusting the oxygen flow rate adjustment valve linked to the mechanism, and the N, ○ flow rate adjustment is performed by adjusting the laughing gas throttle mechanism and laughing gas flow II.
It is adjusted by adjusting the valve, and the oxygen concentration drop protection device can be integrated with the flow meter, making it more compact.

"Example" An embodiment of the present invention will be described below with reference to FIG.

In this embodiment, the same parts as in the conventional example are given the same reference numerals, and the explanation thereof will be omitted.

Reference numeral 31 in Fig. 1 is the main body of the gas flow regulator in the anesthesia machine, and the main body 31 of the gas flow regulator has a first valve in the form of a stepped through hole with a circular cross section and a large diameter part and a small diameter part. Hole 3
2, a second valve hole 33 having a bottom portion 33a, a small diameter portion 33b, and a step portion 33c is formed. The first valve hole 32 and the second valve hole 33 are located on axes that are parallel to each other and spaced apart.

A short cylindrical valve box (oxygen flow rate adjustment mechanism) 34 is tightly fitted into one end of the first valve hole 32 by screwing a portion of its one end side. A valve body insertion hole 35 having a bottom and a circular cross section is formed at the center of the other end of the valve box 34 . Further, a stepped cylindrical ring body 36 is tightly fitted into the large diameter portion of the first valve hole 32 at a distance from the valve body 34 to connect the large diameter portion and the small diameter portion of the first valve hole 32. It is brought into contact with a step portion 37 formed at the boundary. A stepped portion 3 formed on the other end surface of the valve box 34 and the ring body 36
A spring 38 is provided between the valve box 34 and the ring body 36 so as to apply a biasing force in a direction to separate the valve box 34 and the ring body 36.

Further, a first valve body 39 is tightly fitted into the small diameter portion of the first valve hole 32 by screwing a portion of its one end side. 1st
At the other end of the valve body 39 is a needle valve body 4 whose outer periphery is tapered.
0 is integrally provided, and a knob shaft 41 located on the axis of the first valve body 39 is provided at one end of the first valve body 39.
are integrally provided. Knob 4 is attached to the knob shaft 41.
2 is installed.

The valve body 34 has an oxygen passage 43.4 passing through it in the diametrical direction.
4 is formed. The oxygen flow path 44 is formed to communicate with a valve chamber 45 formed between the bottom of the valve body insertion hole 35 and the other end surface of the first valve body 39 .

Further, the gas flow regulator body 31 is formed with an oxygen outlet 46 that is perpendicular to the axis of the first valve hole 32 and communicates the oxygen flow path 43 with the outside of the gas flow regulator body 31 .

Further, the gas flow j1M regulator main body 31 has a first valve hole 32.
An oxygen inlet 47 is formed that is perpendicular to the axis of the valve chamber 45 and communicates the outside of the gas flow regulator main body 31 with the valve chamber 45 .

The gas flow regulator main body 31 also has a space 48 that is perpendicular to the axis of the first valve hole 32 and is formed between the valve box 34 and the ring body 36 and communicates with the outside of the gas flow regulator main body 31. A laughing gas inlet 49 is formed.

The oxygen flow path 43 and the valve chamber 45 are communicated with each other by a communication path 5o. The inner diameter of the communication passage 5o is larger than the outer diameter of the tip of the needle valve element 4o of the first valve element 39 and smaller than the outer diameter of the base of the needle valve element 40.

Further, the first valve body 39 has a small diameter portion 39a inserted into the valve body insertion hole 35 of the valve body 34, and an intermediate diameter portion 39b fitted into the small diameter portion of the first valve hole 32. The small diameter part 39
A tapered portion 39C is formed at the boundary between a and the intermediate diameter portion 39b. A groove 39d communicating with the laughing gas passage 61 is formed in the tapered portion 39c.

By rotating the valve box 34 or the first valve body 39, the inner peripheral surface of the communication passage 50 and the needle valve body 40 are connected to each other.
It is possible to adjust the gap between the outer peripheral surface of the
By turning the first valve body 39, the inner peripheral surface of the center hole small diameter portion 36a of the annular body 36 and the tapered portion 39C8 of the first valve body 39 are
The gap between the groove 39d and the groove 39d can be adjusted. In addition, 51, 52, 53, 54, 55.5
6 is a seal ring, and 57 is a tool groove for turning the valve body 34.

Further, the valve body insertion hole 35 and the second valve hole 33 are communicated with each other through a laughing gas flow path 61 formed within the gas flow regulator main body 31. A second valve body 62 is provided in the second valve hole 33.
A portion of one end thereof is screwed together to form a tight fit.

A needle valve element 63 having a tapered outer periphery is integrally provided at the other end of the second valve element 62 , and a needle valve element 63 having a tapered outer periphery is integrally provided at one end of the second valve element 62 . The positioning knob shaft 64 is also integrally provided. A knob 65 is attached to the knob shaft 64.

The gas flow regulator body 31 also includes a laughing gas outlet 66 which is perpendicular to the axis of the second valve hole 33 and communicates between the small diameter portion 33b of the second valve hole 33 and the outside of the gas flow regulator body 31. is formed. Note that a valve chamber 67 is formed between the step portion 33c of the second valve hole 33 and the second valve body 62. 6
8 is a seal ring, 69 is a drain hole, and 7o is a seal lid.

The gas flow regulator main body 31 is combined with the flow meter 7 so as to be integrated, and in this combined state, the oxygen outlet 46 is connected to the pipe 7a of the flow meter 7, and the laughing gas outlet 66 is connected to the pipe 7a of the flow meter 7. 7b.

When using the oxygen concentration drop protection device in the gas supply device configured as described above, patient safety is important because, as mentioned above, if only N and O flow into the patient, there is a risk of oxygen deficiency. O of the gas supplied to the patient to ensure
The N and O flow rates are controlled relative to the f flow rate to 0. The minimum concentration of 30
It is necessary to ensure that %.

Therefore, in advance, the oxygen inlet 47 is connected to an O gas cylinder or an O2 supply connection port of the hospital's medical gas piping equipment, and the laughing gas inlet 49 is connected to an N gas cylinder.

Connect the N and 0 supply connections of the 0 cylinder or the hospital's medical gas piping equipment. Then, when O2N, 0 flows from these to the present oxygen concentration drop protection device, O2 flows out from the oxygen outlet 46 through the oxygen flow path 43, and N and O flow through the laughing gas flow path 46.
1. Oxygen and laughing gas flowing out from the laughing gas outlet 66 through the small diameter portion 33b and flowing out from the oxygen outlet 46° and the laughing gas outlet 66 are measured by the flow meter 7, and then transferred to the vaporizer 6.
．． Anesthetic gas supply pipe 4. It passes through the connecting tube 3 and flows into the breathing circuit section 2.

In this case, when the knob 42 is turned, the first valve body 39 moves forward or backward relative to the valve body 34 . Further, when the knob 65 is turned, the second valve body 62 moves forward or backward relative to the stepped portion 33c of the second valve hole 33.

Therefore, in this embodiment, the N) ox concentration is determined by turning the valve box 34 through the communication path 50.
Adjustment of the gap between the inner peripheral surface of the needle valve body 4o and the outer peripheral surface of the needle valve body 4o (hereinafter referred to as valve N adjustment), and adjustment of the opening between the inner peripheral surface of the center hole of the ring body 36 and the tapered portion 39c and the groove 39d (this The adjustment simultaneously adjusts the gap between the inner circumferential surface of the communication passage 50 and the outer circumferential surface of the needle valve body 4o (hereinafter referred to as "taber section adjustment").

(2) The Ox flow rate is adjusted by the valve box adjustment and the tapered part adjustment, but after the position of the valve box 34 is set, it is adjusted only by the taper part adjustment.

(3) Adjustment of N and O flow rates includes adjustment of the tapered portion 39c,
The adjustment is made by adjusting the gap between the inner circumferential surface of the small diameter portion 33b and the outer circumferential surface of the needle valve 63 (hereinafter referred to as needle valve 63 adjustment).

That is, in advance, the second valve body 62 is sufficiently retreated from the zero stage portion 33c, and the first valve body 39 is sufficiently retreated from the valve box 34. Then, the space between the center hole of the annular body 36 and the tapered portion 39c is wide open, the laughing gas flow path 61 is sufficiently opened, and the space between the communication hole 50 and the needle valve body 40 is also wide open. Then, laughing gas freely flows into the laughing gas flow path 61 from the laughing gas inlet 49, flows out from the laughing gas outlet 67, and sufficiently flows into the flowmeter 7, but also from the oxygen inlet 47. Oxygen freely flows into the oxygen flow path 43 and flows fully into the flow meter 7. Therefore, in this state, based on the above (1), the valve body 34 is rotated to retreat from the needle valve body 40,
The position of the valve box 34 relative to the gas flow regulator main body 31 is fixed so that the Ota degree is 30% by the flowmeter 7. This results in a predetermined minimum of 0. A concentration of 30% is ensured.

(2) To adjust during use, in the state (2), the O2 flow rate is adjusted by moving the first valve body 39 forward toward the valve box 34 side and then moving it back and forth to adjust the tapered portion.

In this case, the tapered portion 3 is linked to the needle valve body 40.
Since 9c moves, the flow rate is adjusted after ensuring a minimum concentration of 30%.

(2) To perform N and ON type O adjustment, adjust the taper portion 39cl and adjust the needle valve 63 in the state (2).

In this case, at least 0. After ensuring a concentration of 30%, N,
○Flow rate adjustment is performed.

As described above, in this embodiment, the minimum concentration 3 at 0° is achieved by controlling the N and ○ flow rates with respect to the ○ and ○ flow rates of the gas supplied to the patient.
0% can be secured.

In addition, since the gas flow rate adjustment mechanism is relatively simple, the gas flow rate j! The regulator body 3I can be incorporated into the block of the flowmeter 7, reducing the number of parts and making it more compact.

In addition, the piping exiting to the outside of the flow meter 7 is ○, the inflow piping is N, and
○Since it can be made into two pipes including the inflow pipe, the risk of fluid leakage can be reduced. 0 when adjusting the N and O flow rates. Since the concentration can always be automatically set to 30% or more, operability is improved.

In addition, since the flow meter 7 and the oxygen concentration drop protection device of this embodiment were able to be integrated, since the conventional flow meter and the oxygen concentration drop protection device were connected by piping, the residual pressure in this piping caused N It is possible to prevent the phenomenon of the float of the flow meter jumping up, which occurs during O adjustment, and it is possible to eliminate the anxiety felt by the doctor.

"Effects of the Invention" As explained above, according to the present invention, in a gas supply device that measures the flow rates of each gas from a laughing gas source and an oxygen gas source and supplies anesthetic gas at a predetermined concentration, the gas flow rate a regulator body; an oxygen flow path formed within the gas flow regulator body and communicating an oxygen inlet and an oxygen outlet provided in the gas flow regulator body; the oxygen inlet;
an oxygen flow tg valve provided between the oxygen outlet so as to be able to freely adjust the cross-sectional area of the oxygen flow path; and a laughing gas flow formed within the gas flow regulator main body and provided in the gas flow regulator main body. A laughing gas flow path communicating between an inlet and a laughing gas outlet, and a laughing gas flow path provided between the laughing gas inlet and the laughing gas outlet so that the cross-sectional area of the laughing gas flow path can be freely adjusted. A flow rate adjustment valve is provided between the laughing gas inlet and the laughing gas flow rate adjustment valve so that the cross-sectional area of the laughing gas flow path can be adjusted in conjunction with the operation of the oxygen flow MHI adjustment valve. The oxygen flow is controlled separately from the laughing gas throttle mechanism and the opening degree adjustment of the oxygen flow rate adjustment valve that is interlocked with the laughing gas throttle mechanism. Since the oxygen flow rate adjustment mechanism provided in the gas flow rate regulator body is provided so that the opening degree of the regulating valve can be freely adjusted, the N and O flow rates are controlled with respect to the O2 flow rate of gas supplied to the patient, and the minimum Ol A concentration of 30% can be ensured.

In addition, since the flow rate adjustment mechanism is relatively simple, the gas flow rate regulator body can be integrated with the flow meter, reducing the number of parts and making it compact.

Also, connect the piping that exits the flowmeter to the outside of the flowmeter.
Since there can be two pipes including the inflow pipe, the possibility of fluid leakage can be reduced.

Also, when adjusting the N,○ flow rate, the concentration is always automatically set to 30.
% or more, operability is improved.

In addition, since we were able to integrate the flow meter and the oxygen concentration drop protection device, the residual pressure generated in the piping due to the conventional flow meter and oxygen concentration drop protection device being connected by piping caused the N, 014 adjustment. It is possible to prevent the phenomenon of the float of the flowmeter from jumping up, which has been occurring, and it is possible to prevent the doctor from feeling anxious.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view of a low oxygen concentration protection device in a gas supply device showing an embodiment of the present invention, and FIG. 2 is a schematic piping diagram for explaining the outline of the gas supply section of a conventional anesthesia machine.
FIG. 3 is a partially cutaway vertical sectional view showing an example of a conventional oxygen concentration drop protection device. 31... Gas flow regulator body, 34...
Valve box (oxygen flow rate adjustment mechanism), 39...first valve body,
39c... Taper part (laughing gas throttle mechanism), 40
...Needle valve body (oxygen flow rate adjustment valve), 43.
44...Oxygen flow path, 46...Oxygen outlet, 4
7...Oxygen inlet, 49...Laughing gas inlet, 61...Laughing gas flow path, 62...Second valve body, 63...Needle valve Body (laughing gas flow control valve),
66...Laughing gas outlet.

Claims (1)

[Claims] Measuring the flow rates of each gas from a laughing gas source and an oxygen gas source,
A gas supply device that supplies anesthetic gas at a predetermined concentration includes a gas flow regulator body, an oxygen inlet and an oxygen outlet formed in the gas flow regulator body and provided in the gas flow regulator body. a communicating oxygen flow path and the oxygen inlet;
an oxygen flow rate adjustment valve provided between the oxygen outlet ports so as to be able to freely adjust the cross-sectional area of the oxygen flow path; and a laughing gas inlet formed within the gas flow rate regulator body and provided in the gas flow rate regulator body. and a laughing gas flow path that communicates with the laughing gas outlet, and a laughing gas flow path provided between the laughing gas inlet and the laughing gas outlet so that the cross-sectional area of the laughing gas flow path can be adjusted. A regulating valve is provided between the laughing gas inlet and the laughing gas flow regulating valve so that the cross-sectional area of the laughing gas flow path can be adjusted in conjunction with the operation of the oxygen flow regulating valve. A gas flow rate adjustment mechanism is provided in the gas flow rate regulator body so as to be able to freely adjust the opening degree of the oxygen flow rate adjustment valve separately from the opening degree adjustment of the oxygen flow rate adjustment valve with which the laughing gas throttle mechanism is interlocked. An oxygen concentration drop protection device in a gas supply device, comprising: an oxygen flow rate adjustment mechanism;