JP2831819B2 - Oxygen concentration reduction protection device in gas supply device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxygen concentration reduction protection device in a compact gas supply device that ensures safety and has good operability.

_2. Description of the Related Art As is well known, an anesthesia machine is provided with a gas supply unit that supplies an anesthetic gas obtained by mixing laughing gas (N ₂ O) and oxygen gas (O ₂ ), and is supplied from the gas supply unit. And a breathing circuit section for appropriately sending the discharged gas to the patient. In the anesthesia machine, when only N ₂ O flows when anesthesia gas is supplied, it is dangerous to cause oxygen deficiency.To prevent this, limit the N ₂ O flow rate to the O ₂ flow rate and fully open the N ₂ O supply passage. Even 30% O ₂ flows.

This anesthesia machine is, as shown in FIG.
And a breathing circuit section 2. The gas supply unit 1 and the breathing circuit unit 2 are connected by one connection pipe 3.

The connection pipe 3 is connected to an anesthetic gas supply pipe 4 and an oxygen rapid supply pipe 5 in the gas supply section 1. A vaporizer 6 is interposed in the middle of one anesthetic gas supply pipe 4, and a flow meter 7 is connected to the end of the vaporizer 6. In flow meter 7, two pipes
The flow branches to 7a and 7b, and the flow rates of oxygen gas (O ₂ ) and laughing gas (N ₂ O) can be measured.
A gas cylinder or a medical gas piping facility of a hospital can be connected via a flow control valve 8 shown in the figure. The other quick oxygen supply pipe 5 is connected to a supply pipe connecting the O ₂ pipe of the flow meter 7 and an O ₂ gas source, and a flash valve 9 is attached in the middle thereof.

In the flow control valve 8 of the gas supply unit 1 of the anesthesia machine of the structure, as shown in FIG. 3, the O ₂ flow rate flowing from the O ₂ inlet 11 is up to about 5 / min O ₂
Passes through the passage 12 and flows out from the O ₂ outlet 13 and flows into the pipe 7a of the flowmeter 7 through the pipe 13a. When the flow rate exceeds 5 / min, the O ₂ pressure is reduced by the throttle valve 14 so that the O ₂ pressure is reduced. To rise.

Further, N ₂ O flowing from the N ₂ O inlet 15 passage 16, the orifice 17 flows out from the street N ₂ O outlet 18, so as to flow into the pipe 18a as flow meter 7 of the tube 7b.

Incidentally, being adapted to the valve shaft 19a of the diaphragm valve 19 can perform the maximum flow rate regulation of N ₂ O by turning it, the valve shaft 22a of the diaphragm valve 22, N ₂ O by turning this The O ₂ flow rate at the time when the gas begins to flow can be increased.

In addition, the flow meter has a configuration in which a float is placed in a glass tube having a scale, and when the gas flows, the float stops when the gas pressure and the gravity of the float are balanced. I have.

Then, the float does not touch the glass tube so that friction does not occur.

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

1) When the O ₂ pressure exceeds a predetermined pressure, O ₂ is supplied to the diaphragm valve 19.
To flow to the passage 20, and this flow is transmitted to the float of the flow meter as it is, and the flow rate rises rapidly.

2) In addition, when the O ₂ pressure decreases and the flow rate is 3 / min or less, the O ₂ flow rate flowing to the flow meter rapidly decreases by closing the diaphragm valve 19.

3) When the needle valve 21 is closed, the O ₂ pressure in the O ₂ passage disappears,
When the diaphragm valve 22 is closed, and then the needle valve 23 is closed, the line from the needle valve 23 to the diaphragm valve 22 is closed.
N ₂ O pressure ~3.5kg / cm ² remains.

4) When the needle valve 21 is opened again, the pressure in the O ₂ passage rises and pushes up the diaphragm valve 22, and several ml of N ₂ O flows from the needle valve 23 to the diaphragm valve 22. Flow to the flow meter, and the float is about 9 / min
To the doctor's scale to make the doctor feel uneasy.

5) Since the flow rate adjusting valve 8 must be separately attached to the flow meter via a pipe, a space is required, the pipe is complicated, the production cost is increased, and there is a problem that a leak easily occurs.

An object of the present invention is to provide an oxygen concentration lowering protection device in a gas supply device that solves the above problems of the conventional device.

"Means for Solving the Problems" The present invention has the following configuration to achieve the above object. That is, in a gas supply device that measures each gas flow from the laughing gas source and the oxygen gas source and supplies a predetermined concentration of anesthetic gas, a gas flow controller main body and a gas flow controller formed in the gas flow controller main body. An oxygen flow path communicating with an oxygen inlet and an oxygen outlet provided in the gas flow controller body; and an oxygen flow path cross-sectional area adjustable between the oxygen inlet and the oxygen outlet. An oxygen flow regulating valve, formed in the gas flow regulator main body, and communicating with a laughing gas flow inlet and a laughing gas flow outlet provided in the gas flow regulator main body; A laughing gas flow control valve provided between the laughing gas inlet and the laughing gas outlet so as to be able to adjust the cross-sectional area of the laughing gas flow path, the laughing gas flow inlet and the laughing gas flow adjusting valve Between the laughing gas flow path cross section in conjunction with the operation of the oxygen flow control valve The laughing gas throttle mechanism is provided so as to be adjustable, and the opening degree of the oxygen flow rate adjusting valve is adjusted independently of the opening degree of the oxygen flow rate adjusting valve in conjunction with the laughing gas throttle mechanism. An oxygen flow control mechanism provided in the flow control device main body.

According to "effect" the structure, O ₂ concentration, Sadamari by adjusting the oxygen flow rate adjustment mechanism and laughing gas throttle mechanism, always automatically ensuring the O ₂ concentration of 30% by these adjustments, O ₂ flow rate Adjustment is
The oxygen flow rate adjusting mechanism and the laughing gas throttle mechanism are adjusted by adjusting an oxygen flow rate adjusting valve, and the N ₂ O flow rate is adjusted by adjusting the laughing gas throttle mechanism and the gas flow rate adjusting valve. In addition, the oxygen concentration lowering protection device can be integrated with the flow meter, and the size can be reduced.

Embodiment An embodiment of the present invention will be described below with reference to FIG. In this embodiment, the same parts as those of the conventional example are denoted by the same reference numerals, and the description thereof will be omitted.

In FIG. 1, reference numeral 31 denotes a gas flow controller main body in the anesthesia machine. The gas flow controller main body 31 has a first valve hole having a stepped through-hole having a circular cross section including a large diameter portion and a small diameter portion. A second valve hole 33 having a bottom portion 32a, a small diameter portion 33b, and a step portion 33c is formed. The first valve hole 32 and the second valve hole 33 are formed so as to be positioned on an axis which is separated in parallel.

At one end of the first valve hole 32, a short column-shaped valve box (oxygen flow rate adjusting mechanism) 34 is tightly fitted by screwing a part of one end thereof. In the center of the other end of the valve box 34, a valve element insertion hole 35 having a circular bottom and having a circular cross section is formed. In addition, the first valve hole 32
The large-diameter part has a stepped cylindrical annular body 36 separated from the valve box 34.
Are closely fitted to each other and are brought into contact with a step portion 37 formed at the boundary between the large diameter portion and the small diameter portion of the first valve hole 32. A spring 38 is provided between the other end surface of the valve box 34 and a step 37 formed on the ring 36 so that a biasing force acts in a direction for separating the valve box 34 and the ring 36.

Further, a first valve body 39 is tightly fitted to the small diameter portion of the first valve hole 32 by screwing a part of one end thereof. The other end of the first valve body 39 is integrally provided with a needle valve body 40 having an outer periphery tapered. One end of the first valve body 39 is provided on the axis of the first valve body 39. A located knob shaft 41 is provided integrally. A knob 42 is attached to the knob shaft 41.

Oxygen passages 43 and 44 are formed in the valve box 34 so as to penetrate in the diameter direction. The oxygen flow path 44 is formed so as to communicate with a valve chamber 45 formed between the bottom of the valve element insertion hole 35 and the other end surface of the first valve element 39.

Further, the gas flow controller main body 31 is formed with an oxygen outlet 46 which is orthogonal to the axis of the first valve hole 32 and communicates the oxygen flow path 43 with the outside of the gas flow controller main body 31.

Further, the gas flow controller main body 31 is formed with an oxygen inlet 47 which is orthogonal to the axis of the first valve hole 32 and communicates the valve chamber 45 with the outside of the gas flow controller main body 31.

In addition, the gas flow controller main body 31 communicates with the space 48 formed between the valve box 34 and the ring body 36 at right angles to the axis of the first valve hole 32 and the outside of the gas flow controller main body 31. Laughter gas inlet 49
Are formed.

The oxygen flow path 43 and the valve chamber 45 are connected by a communication path 50. The inner diameter of the communication passage 50 is the needle valve body 40 of the first valve body 39.
Of the needle valve body 40 is smaller than the outer diameter of the base of the needle valve body 40.

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

By turning the valve box 34 or turning the first valve body 39, the gap between the inner peripheral surface of the communication passage 50 and the outer peripheral surface of the needle valve body 40 can be adjusted, and the first By turning the valve body 39, the gap between the inner peripheral surface of the center hole small diameter portion 36a of the annular body 36 and the tapered portion 39c and the groove 39d of the first valve body 39 can be adjusted. . Note that 5
1, 52, 53, 54, 55 and 56 are seal rings, and 57 is a tool groove for turning the valve box 34.

Further, the valve element insertion hole 35 and the second valve hole 33 are communicated with each other by an laughing gas flow path 61 formed in the gas flow controller main body 31. The second valve body 62 is tightly fitted into the second valve hole 33 by screwing a part of one end thereof.

The other end of the second valve body 62 is integrally provided with a needle valve body 63 having a tapered outer periphery. One end of the second valve body 62 is provided on the axis of the second valve body 62. The located knob shaft 64 is provided integrally. A knob 65 is attached to the knob shaft 64.

The gas flow controller main body 31 has a laughing gas outlet 66 which is orthogonal to the axis of the second valve hole 33 and communicates the small diameter portion 33b of the second valve hole 33 with the outside of the gas flow controller main body 31. Are 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. 68 is a seal ring, 69
Is a drain hole, and 70 is a seal lid.

The gas flow controller body 31 is combined with the flow meter 7 so as to be integrated. 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 flow meter 7.
Connected to the tube 7b.

When using the oxygen concentration lowering protection device in the gas supply device configured as described above, as described above, when only N ₂ O flows into the patient, there is a danger of oxygen depletion, which may cause patient safety. Supply of O ₂ to the patient to ensure
It is necessary to control the N ₂ O flow rate with respect to the flow rate so as to ensure a minimum concentration of O ₂ of 30%.

Therefore, in advance, an O ₂ cylinder or a medical gas of a hospital is connected to an O ₂ supply connection port of a piping facility to the oxygen inlet 47, and an N ₂ O cylinder or a medical gas pipe of the hospital is connected to the laughing gas inlet 49. Connect the N ₂ O supply connection of the equipment. Then, when O ₂ and N ₂ O flow from the oxygen-lowering device, the O ₂
Flows out from the oxygen outlet 46 through the oxygen flow path 43, and N ₂ O flows out from the laughter gas outlet 66 through the laughing gas flow path 61 and the small diameter portion 33b, and the oxygen outlet 46, the laughing gas flow The oxygen and laughter gas flowing out of the outlet 66 are measured by the flow meter 7, respectively, and the vaporizer 6,
It flows into the breathing circuit 2 through the anesthetic gas supply pipe 4 and the connection pipe 3.

In this case, turning the knob 42 causes the first valve
39 moves forward or backward. In other words, if you turn 65,
The second valve body 62 moves forward or backward with respect to the stepped portion 33c of the valve hole 33 of the second embodiment.

Therefore, in the present embodiment, (1) the O ₂ concentration is determined by adjusting the gap between the inner peripheral surface of the communication passage 50 and the outer peripheral surface of the needle valve body 40 by turning the valve box 34 (hereinafter referred to as valve box adjustment). ) And the inner peripheral surface of the center hole of the ring 36
The gap between the inner peripheral surface of the communication passage 50 and the outer peripheral surface of the needle valve body 40 is adjusted at the same time by adjusting the gap between the groove 39c and the groove 39d. It has been done.

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

(3) The N ₂ O flow rate adjustment is performed by adjusting the taper portion 39c and the small diameter portion.
The clearance is adjusted by adjusting the gap between the inner peripheral surface of the needle 33b and the outer peripheral surface of the needle valve 63 (hereinafter referred to as the needle valve 63 adjustment).

That is, the second valve body 62 is sufficiently retracted from the step 33c in advance and the valve box 3
From 4, the first valve element 39 is fully retracted. Then, the space between the center hole of the annular body 36 and the tapered portion 39c is greatly opened, 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 greatly opened. Then, the laughing gas flows freely from the laughing gas flow inlet 49 into the laughing gas flow channel 61, flows out from the laughing gas flow outlet 67 and sufficiently flows into the flowmeter 7, but also from the oxygen flow inlet 47. Oxygen freely flows into the oxygen flow path 43 and sufficiently flows into the flow meter 7. Therefore, in this state, from the above (1), the valve body 34 is turned to rotate the needle valve body.
The valve is retracted from 40 and the position of the valve box 34 with respect to the gas flow controller main body 31 is fixed by the flow meter 7 so that the O ₂ concentration becomes 30%. This ensures a predetermined minimum O ₂ concentration of 30%.

At the time of use, to adjust O ₂ , in the state of
The first valve element 39 is advanced toward the valve box 34 and then moved backward and backward to adjust the taper portion, thereby adjusting the O ₂ flow rate.

In this case, the tapered portion 39 is interlocked with the needle valve body 40.
Since c moves, the O ₂ flow rate is adjusted after securing a minimum O ₂ concentration of 30%.

In order to adjust the N ₂ O flow rate, in the state described above, the adjustment of the taper portion 39c and the adjustment of the needle valve 63 are performed.

In this case, the flow rate of N ₂ O is adjusted after securing a minimum O ₂ concentration of 30%.

As described above, in the present embodiment, the N ₂ O flow rate is controlled with respect to the O ₂ flow rate of the gas supplied to the patient, and a minimum O ₂ concentration of 30% can be secured.

Further, since the gas flow rate adjusting mechanism is relatively simple, the gas flow rate adjuster main body 31 can be incorporated in the block of the flow meter 7, and the number of parts is reduced and the size is reduced.

In addition, the pipe going out of the flowmeter 7 is connected to the O ₂ inflow pipe and the N ₂ O
Since there can be two pipes with the inflow pipe, the possibility of fluid leakage can be reduced. O ₂ when adjusting N ₂ O flow rate
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 lowering protection device of the present embodiment could be integrated, the conventional flow meter and the oxygen concentration lowering protection device were connected by piping, so that the residual pressure in this piping caused N It is possible to prevent the float phenomenon of the flow meter from jumping up at the time of the ₂ O adjustment, and to eliminate the anxiety of the doctor.

[Effects of the Invention] As described above, according to the present invention, the gas supply device that supplies the anesthetic gas of a predetermined concentration by measuring each gas flow from the laughing gas source and the oxygen gas source, A regulator main body, an oxygen flow passage formed in the gas flow regulator main body, and communicating between an oxygen inlet and an oxygen outlet provided in the gas flow regulator main body; An oxygen flow control valve provided between the oxygen flow path cross-sectional area so as to be adjustable, and a laughter gas inlet formed in the gas flow regulator main body and provided in the gas flow regulator main body, and a laughter gas. A laughing gas flow path communicating with a gas outlet, and a laughing gas flow rate adjusting valve provided between the laughing gas inlet and the laughing gas outlet so as to adjust the cross-sectional area of the laughing gas flow path; The oxygen flow between the laughing gas inlet and the laughing gas flow control valve. A laughing gas throttle mechanism provided so that the laughing gas flow path cross-sectional area can be adjusted in conjunction with the operation of the amount adjusting valve; and Separately provided an oxygen flow rate adjusting mechanism provided on the gas flow rate adjuster body so as to freely adjust the opening degree of the oxygen flow rate adjusting valve, so that the N ₂ O flow rate with respect to the O ₂ flow rate of the supply gas to the patient Control the O
The minimum concentration of ₂ can be 30%.

Further, since the flow rate adjusting mechanism is relatively simple, the gas flow rate adjuster main body can be combined with the flow meter and integrated, so that the number of parts is reduced and the size is reduced.

In addition, since the number of pipes exiting the flow meter can be two, that is, the O ₂ inflow pipe and the N ₂ O inflow pipe, the risk of fluid leakage can be reduced.

In addition, since the O ₂ concentration can always be automatically set to 30% or more when adjusting the N ₂ O flow rate, the operability is improved.

Moreover, since it was possible to integrate the flowmeter and the oxygen concentration decreases protector, the residual pressure generated in this pipe and a conventional flow meter and an oxygen concentration lowered protective device for linked by a pipe, at the time of N ₂ O adjusted It is possible to prevent the floating phenomenon of the flow meter from jumping up and to prevent the doctor from feeling uneasy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of an oxygen concentration lowering protection device in a gas supply device showing one embodiment of the present invention, FIG. 2 is a schematic piping diagram for explaining the outline of a gas supply portion of a conventional anesthesia machine,
FIG. 3 is a partially cutaway longitudinal sectional view showing an example of a conventional oxygen concentration decrease protection device. 31 ... gas flow controller main body, 34 ... valve box (oxygen flow rate adjusting mechanism), 39 ... first valve element, 39c ... taper portion (laughing gas throttle mechanism), 40 ... needle valve element ( Oxygen flow control valve), 43, 44 Oxygen flow path, 46 Oxygen outlet, 47
Oxygen inlet, 49 laughing gas flow inlet, 61 laughing gas flow path, 62 second valve body, 63 needle valve body (laughing gas flow rate adjustment valve), 66 lol Gas and gas outlet.

Claims (1)

(57) [Claims] 1. A gas supply device for measuring a gas flow rate from an laughing gas source and an oxygen gas source and supplying a predetermined concentration of an anesthetic gas, comprising: a gas flow controller main body; An oxygen flow path formed in the gas flow controller main body and communicating an oxygen inlet and an oxygen outlet, and the oxygen inlet,
An oxygen flow control valve provided between the oxygen flow outlets so as to adjust the cross-sectional area of the oxygen flow path; and a laughing gas flow inlet formed in the gas flow regulator main body and provided in the gas flow regulator main body. A laughing gas flow path communicating between the laughing gas flow outlet and the laughing gas flow outlet, and a laughing gas flow rate provided between the laughing gas flow inlet and the laughing gas flow outlet such that the cross section of the laughing gas flow path is adjustable. A regulating valve, and a laughing gas flow path cross-sectional area that is adjustable between the laughing gas flow inlet and the laughing gas flow regulating valve in conjunction with the operation of the oxygen flow regulating valve. The gas flow restrictor is provided on the gas flow regulator main body so as to be capable of freely adjusting the opening of the oxygen flow control valve separately from the opening control of the oxygen flow control valve in which the laughing gas restrictor is interlocked. An oxygen flow rate adjusting mechanism; and an oxygen concentration reduction in the gas supply device, comprising: Protection equipment.