DE2003036A1 - Anesthetic machine - Google Patents

Description

OR ₁ -INa ₁ DIPU-INa. M. SC. UIPL.-PH / S. UR. DI ^ L.-PHYS. '

HOGER LEGAL GRIESSBAGH HAECKER

PATENT LAWYERS IN STUTTSART

A 37 96Hm '2Q03Q33

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January 22, 1970

CHEMETRON CORPORATION '840 North Michigan Avenue CHICAGQ ₃ Illinois 6O6li USA

Anesthetic machine

The invention relates to an anesthetic machine for production one, IJarkQsegasgemisGhes by mixing an anesthetic ^ steam with a gas stream and is used to anesthetize Patient.

To put a patient in a state of painlessness or pain. To put anesthesia on, the patient will induce a gas mixture inhaling consisting of oxygen and an anesthetic vapor. Commonly used, intended for inhalation

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Anesthetic gases are ethers, halothane (which is available under the trade name Pluothane), trichlorethylene, methoxyflurane (which is available under the trade name penthrane) and others. The desired concentration of a particular narcotic vapor in oxygen or in another gas changes depending on the particular patient, and indeed it can change over a considerable range, since the narcotic is first entered into the patient and then in the P sequence on one given status must be maintained. In addition, the concentration range changes considerably for the various agents used. For example, the concentration of ether can in some cases be 8 % and more, while methoxyflurane can be administered at a concentration as low as 0.2 %.

Anesthetics are usually in the form of volatile liquids and numerous methods have been used to vaporize the liquid anesthetic in a gas stream or to allow this agent to be absorbed by the gas stream. This occurs in known anesthetic machines of this type or several problems appearing among them for example a_Lack of accuracy in achieving and maintaining a desired concentration, especially over a wide one Concentration range necessary when using various anesthetics, an unnecessary complexity, inconvenience and high cost. One known method is, for example, a gas flow through a supply of liquid Bubbling anesthetic to make a highly concentrated mixture. Then this mixture is again diluted to achieve the desired level of concentration.

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A difficulty encountered in this process is to be seen in achieving the desired concentration precisely because the rate of evaporation varies greatly with temperature and pressure conditions.

Other known methods use an evaporator through which a gas stream is passed. A measured amount of liquid anesthetic is in the vaporizer introduced and evaporated into the gas stream. The accuracy of this arrangement is not very dependent on the temperature and pressure conditions because it is intended to contain the total amount of anesthesia introduced into the vaporizer to vaporize the gas stream. However, it is difficult to determine the amount of liquid anesthetic in the vaporizer is introduced to accurately measure and maintain a constant back pressure to bring the liquid anesthetic into the vaporizer to squeeze into it. As an example of such a system, the arrangement in US Pat. No. 3,128,764 be considered.

It is therefore the object of the following invention to

> «J3w v * rtess £ rt * S tor drive iur Menttlunf einet JbrAtnep> sfemisch * i tofit ^ • to avoid parts of the known arrangement uridVemen to provide an improved anesthetic machine, which generates an anesthetic gas mixture, the concentration of anesthetic gas in the gas mixture over a wide range can be precisely regulated and controlled. At the same time, the anesthesia machine according to the invention should be simple and convenient to use and, in particular, allow the concentration of the anesthetic gas in the gas mixture obtained to be changed over a wide range, ie freely adjusted and controlled with great accuracy.

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Another object of the invention is to provide an anesthetic machine which is suitable for having a to operate a large number of different anesthetics, both in one closed and in one open system.

The invention is based on an anesthetic machine for production an anesthetic gas mixture by mixing an anesthetic vapor with a gas flow and solves the mentioned tasks in that an evaporation chamber is provided through which the gas flow is passed via lines, that one for receiving the liquid anesthetic suitable, closed container is provided, from which a liquid line extends extends into the evaporation chamber and that means are provided which allow the closed container so under To put pressure that the supply of liquid anesthetic is gradually over the liquid line with one of the respective Height of the liquid level independent amount emptied into the evaporation chamber.

This happens because the anesthetic machine according to the invention a constant dynamic pressure is generated, which ensures that the liquid anesthetic is independent of its container is driven out by the height of the respective liquid level.

In short, the anesthetic machine according to the invention consists of a vaporization chamber through which a gas flow is passed through, to which a narcosis vapor is to be added. From a closed container, which with a The supply of anesthetic is filled, is connected via a connection

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conduction an anesthetic in its liquid state introduced into the evaporation chamber. It's an important one Feature of the invention that the pressure is within the closed The container drives the anesthetic through the connecting line into the evaporation chamber ^ and that is the flow rate regardless of the respective height of the liquid level of the anesthetic agent in the container. Correspondingly, there is also a contrast to many known arrangements there is no need to always maintain a constant liquid level in the container. The invention achieves a constant flow in that the container by means of a pressure line which. communicates with the container at a point below the liquid level of the anesthetic is under pressure is set. -

The flow rate or the amount of liquid that is in the Evaporation chamber flows, becomes accurate and convenient by changing the differential pressure between the evaporation chamber and the container is present, regulated. In accordance with a feature of the invention, the differential pressure is controlled by regulating the pressure in a pressure line connected to the container, or by regulating the Pressure in the evaporation chamber, or by regulating the pressure in both.

Another feature of the invention is in simplicity and To see the convenience of the anesthetic machine. In certain embodiments According to the invention, the sealed container containing the liquid anesthetic consists of the bottle or the container in which the liquid anesthetic is delivered will. The bottle is then put in via further funds

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connected in a tight sealing manner to a support member which in turn is connected to the evaporator, and both the pressure line as well as the liquid line for the anesthetic extend into the bottle up to a point below the surface of the liquid anesthetic in the bottle. Because of this arrangement, the moreover is extremely simple and inexpensive, it eliminates the waste of anesthetics in known apparatus of this type "Reduced by evaporation, it is also extraordinary easy to switch from one anesthetic to another.

The anesthetic machine according to the present invention may further include a novel arrangement for maintaining a uniform differential pressure between the evaporation chamber and the pressure regulator by monitoring the container pressure in accordance with smaller pressure fluctuations within the evaporation chamber. In addition, also a, a limited extent exhibiting vent tube between the container and the evaporation chamber may be provided to the structure of a high pressure due to an accelerated encryption m dunstung the anesthetic liquid in the container to prevent.

Furthermore, a double-acting valve with a single control operation can be provided to allow access from Pressurized gas to the control unit and also through the evaporation chamber to regulate flowing gas flow.

These and many other advantages of the present invention can be found in the following description in which the structure and mode of operation of FIG Embodiments of the invention are explained in more detail.

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It shows:

Fig. 1 schematically in a side view and partially in Section through an evaporator according to the invention,

Fig. 2 shows schematically in a side view and partially in section another embodiment of the invention,

Fig. 3 shows schematically and also in a side view a further embodiment of the invention,

Fig. 4 shows a perspective view of one in itself

closed evaporation unit, which is shown in Fig.3 contains parts shown,

Fig. 5 shows the self-contained evaporation unit 4 in an exploded view,

6 is an enlarged cross-section taken in the direction of lines 6-6 of FIGS

FIG. 7 shows another side view of that shown in FIG Apparatus

In the drawings, initially in Figure 1 is a «Direction of evaporation or gasification of a liquid ilar-, shown in accordance with the present invention and generally designated 10. The facility IO closes irr.

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essentially an evaporation chamber, which on the whole with 12 is designated and a closed storage container, which is designated as 14 in its entirety. A gas flow that is a narcotic Gas to be added is supplied through a shut-off valve 15 from a pressurized gas source by means of an inlet pipe 16 and an outlet conduit 18 passed through an evaporation chamber 12; the outlet pipe 18 is connected to an apparatus * in connection who uses the narcotic mixture and the "example part of a closed oaer open narcotic System can be. In an open system, a gas, for example oxygen, passes through the evaporation chamber 12 and becomes there mixed with a desired concentration of anesthetic gas; Finally, the gas reaches the breathing apparatus via an outlet line 18 of the patient. In a closed system, the gas mixture is returned in a closed circuit, carbon dioxide is removed from the exhaled gas and additional oxygen is added along with the narcotic gas, to complete the gas circulation again.

In accordance with a v / ichtigen feature of the invention is forcibly caused ψ liquid anesthetic to flow from the closed vessel 14 via a liquid line 20 into the vaporization chamber 12, and zv / ar to an extent that accurate tens controlled and independent of the liquid level in the container 14 is. At the beginning the container 14 is supplied with an anesthetic liquid, and no efforts are made during the use of the anesthetic liquid to keep the liquid level within the container 14 constant the liquid level

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in the, container 14 is / is the container 14 by means of a Pressure line 22, one end 22a of which is inside the container preferably near the floor surface, so that the outlet is below the liquid surface, below Pressure set. As a result, it remains predetermined for a given Pressure in the pressure line 22 is the pressure head that the emptying of the liquid through the line 20, constant regardless of the height of the liquid level in the container 14, and without any need to use special Control devices results. This represents a significant advance in terms of simplicity and convenience over known ones Devices that are used to maintain a constant pressure gradient Complicated and expensive apparatus for forcing a liquid passage from the container into the evaporation chamber needed to maintain constant narcotic levels. .

More precisely, the dynamic pressure settles at the lower end 20a the liquid line 20 composed of two parts. The one Dynamic pressure component is due to the steam or gas pressure within of the container 14 above the surface of the contained therein Liquid. The other pressure component is based on the weight of the liquid in the container 14 above of the lower end 20a of the line 20.

With earlier facilities of this type the maintenance was a constant dynamic pressure by trying that one the liquid level in the container was kept at a constant level and that the atmospheric pressure was also kept within of the container kept constant. However, these attempts were needed

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complicated valve systems to maintain a constant liquid level. In contrast, results from the present invention provides a simplified, cheaper and more convenient control device for maintaining a constant Back pressure at the lower end of the line 20.

In the arrangement according to the present invention, the liquid level does not remain constant and that on the liquid level The back pressure to be returned drops when the liquid level also drops. However, since this component the dynamic pressure on the line 22 located below the liquid level as well as on the liquid line 20 has an effect, the pressure of the gas rises within the container 14 and compensates for the falling liquid level. Ultimately, the back pressure acting on the end 20a of the line 20 remains within for a given pressure the pressure line 22 constant.

Although the lower ends' 20a and 22a of the liquid line 20 and the pressure line 22 - as shown in Fig. 1 - are approximately at the same level, it is clear that they are also can be arranged on different levels if so desired. A constant effective dynamic pressure remains on everyone The case is preserved as long as the openings of both the pressure line and the liquid line are below the liquid surface are located.

As stated above, the anesthetic machine is the present one Invention capable of providing precisely controlled anesthetic gas concentrations over a wide range. The line 20 acts

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it is preferably a tube with capillary dimensions, which may include a portion that has an inner diameter of about 0.18 mm. The flow of the anesthetic liquid through the line 20 is based on the rules of a laminar flow, which then in accordance with it the Flow through line 20 the differential pressure between the lower end 20a and the upper end 20b of the conduit, which is located within the evaporation chamber 12, proportionally is. Since the pressure at the lower end 20a of the line 20 from the the pressure prevailing within the pressure line 22 is determined, is the flow rate of liquid anesthetic into the vaporization chamber 12 is proportional to the differential pressure between the pressure line 22 and the interior of the evaporation chamber 12.

According to a further feature of the invention, the flowing through Amount of liquid anesthetic, i.e. the delivery of anesthetic, through line 20 and consequently the percentage concentration narcotic vapors in the gas stream over a wide range precisely controlled by the fact that the pressure within the Container 14 is regulated in relation to the pressure prevailing inside the evaporation chamber. In the one shown in FIG Exemplary embodiment of the invention, the regulation or control of the pressure prevailing in the pressure line 22 is carried out by a pressure regulator generally designated 24 and the regulation or control of the pressure in the evaporation chamber 12 takes place via a back pressure regulator, generally designated 26.

On closer inspection, the following results. The pressure line 22 is connected to the output of a pressure-regulated valve 28, whose input via a shut-off valve 30 with a below

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Pressurized gas source is connected. If desired, a single common compressed gas source can be used both for the gas flow flowing into the line 16 and for the gas supplying the pressure regulator 24, although two different gas sources are indicated in FIG. The pressure regulator 14 may be of any convenient design, it has - as shown - a membrane 32 which is exposed to the _k within the Drucklei tung 22 prevailing pressure and which is' control valve connected to the pressure "28 via a lever arrangement 34, and whereby the valve is controlled so that a constant pressure is maintained within the pressure line 22. The pressure acting on the diaphragm 32 is countered by the force of a spring 36, the spring tension of which is preferably adjustable by means of a manual adjustment 38, whereby the constant pressure level, that prevails within the pressure line 22 can be changed.

The back pressure regulator 26 can also be of any desired type and also, as shown, is similar to pressure regulator 24 in many respects. The flowing through the evaporation chamber 12 fc gas mixture reaches the inlet of a pressure control valve 40 via the outlet line 18, the outlet of which is connected to the anesthetic gas mixture used device is connected. The pressure regulating valve 40 is controlled via a linkage 42 and the membrane 44 in such a way that that the pressure on the input side of the control valve 40 is maintained, and consequently also the pressure within the evaporation chamber 12 remains at a constant level. The pressure inside the evaporation chamber 12 is determined by means of a further, manually operated adjustment device 46 adjusted to a desired level, the adjustment wheel 46 being set on the Meirbran

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ft

44 acting tension force of a spring 48 influenced.

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Öa the flow rate of anesthetic agent through line 20 on the differential pressure between line 22 and the evaporation chamber 12 is determined, the concentration of anesthetic gas in the gas flow precisely and conveniently by means of the hand control 38 and 46 can be adjusted on line pressure regulator 24 and back pressure regulator 26. In the apparatus of the present Invention it is possible ^ the differential pressure and thus the Flow rate either with the regulator 24 or with the regulator 26 to determine and regulate, the other can then be omitted or can be combined with other facilities. on the other hand it is also possible to set one of the controllers 24 and 26 to a permanent fixed value or equal to that Factory set to a selected amount, while the other controller is then adjusted before the anesthetist. If desired, both controllers can of course also be used be used. For example, can then in this case one of the two controllers can be brought to a preselected level, which results in a certain flow rate range, and the other knob is used for fine tuning within one selected area.

Furthermore, there are pressure gauges 50 and 52, respectively, with the corresponding lines, i.e. the pressure line 22 and the outlet line 18 connected to the interior of the evaporation chamber 12 communicates. Reading the pressure gauges 50 and 52 shows the differential pressure that prevails between the pressure line 22 and the evaporation chamber 12, so that the Concentration aft anesthetic gas is calculated from this differential pressure

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can. In another case, it is also possible to provide the display devices 50 and 52 with scales, not shown,
which are calibrated in terms of the anesthetic gas concentration. '

In this context it should be noted that due to
Factors such as friction and inertia in the back pressure regulator
elements contained slight pressure changes and fluctuations

h can occur within the evaporation chamber 12. Even though
these changes are only minor and of a temporary nature
it may be desirable to include these pressure changes
still to be compensated in order to achieve a completely uniformly regulated liquid passage from the container 14 into the evaporation chamber 12. For this purpose, a pressure output line 53, which connects the interior of the evaporation chamber 12 with the upper part of the line pressure regulator 24, is provided an automatic control of the pressure control valve 28 leads to the fact that a constant differential pressure between the evaporation chamber and the container is maintained.

P is retained.

In connection with some anesthetics, such as
Ether, a problem can arise when the container 14 is exposed to light or temperature fluctuations. Under certain conditions it is then possible that the liquid within the container 14 evaporates to an accelerated extent and that
the vapor pressure within the container 14 to an undesirable
Height increases.

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However, it is more expedient than influencing the external conditions which influence the amount of evaporation in this case, to provide a limited vent pipe 54, extending from the top of the closed container 14 in the lower part of the evaporation chamber 12 extends. This Tube has a very small inside diameter and is used to iodine Excess pressure that occurs within the container 14 can, very gradually, into the low pressure area within the evaporation chamber 12 to vent or dismantle. The (Ir: .'-.- se this tube is small and the gas flow is limited this can easily be done by a corresponding calibration of the

System to be balanced.

The following is intended to look more closely at the structure of the Verdampfungskainrner To be received; the chamber 12 consists of a cylindrical. Rolling part 56 which forms an inner chamber and preferably made of a transparent material, such as glass, in order to be able to observe the flow of the narcotic liquid from the line 20 can. The upper end 20b of the conduit is provided with a drop guide 58, which ensures that the liquid forms droplets, instead of on the outer surface down the line 20 ″ and / or into the line 54. '"

The upper and lower parts of the cylindrical wall part 56 are closed by means of Abceckteile 60 and 62.In the upper Cover part 60 is a pair of passages 18a and 53a, each with the corresponding outlet conduit 18 and with the pressure outlet line 53, and with the interior of the evaporation chamber 12 related. The lower one shows similarly Abde, ck- or closing part 62 has a passage 16a, the

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to the inlet conduit 16 and to the interior of the evaporation chamber 12 communicates.

The evaporation chamber 12 is by means of a porous metallic diffusion plate or a diaphragm 64, which is in the lower section 62 is attached, divided into two parts. The gas stream entering via the line 16 passes the diaphragm 64 and reaches the outlet line 18. The liquid anesthetic, P exiting line 20 falls from drop guide 58 on the diaphragm 64 and is completely vaporized due to the gas flow ^ moving through the diaphragm 64 ".

In conjunction with the vaporizer 10 of the present invention, it is not necessary to remove the anesthetic fluid their original container in a special reservoir. Besides being convenient, such an arrangement prevents also the evaporation losses, possible contamination, etc., which in the known devices during the original pouring of the anesthetic from one vessel to the other were disadvantageous. Since the liquid is stored in its original container remains, the possibility of confusing the type of anesthetic being used is also reduced.

So that it is possible that the original container or bottle 66 in which the anesthetic was supplied as a closed one For containers to be used in the system, the lower closure portion 62 carries a sealing member 68 which has a lower surface up / eist against which the opening of the bottle 66 rests. In a tight seal with the sealing block 68 is the Bottle 66 held by means of a bracket 70 which is rotatably suspended in the lower closure part 62, and a clamping screw

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which is pressed against the bottom of the bottle 66. Since the pressure line 22 and line 20 propagate downward through the lower surface of the sealing member 63, the entire device 10 is easy by attaching the bottle 66

by corresponding clamping for commissioning finished and assembled.

One of the advantages of the apparatus according to the present invention is that it works with a high degree of Accuracy. Can be used over a wide range of vaporous concentration fractions of an anesthetic. As a result, the apparatus is very good for using a large one Number of different anesthetic materials, each of which requires concentrations that differ greatly in changing areas. However, if it is for reasons Caution is desired, the use of the device 10 for a given period of time on a particular ilesthetic agent To restrict, then special partial approaches can be provided on the sealing member 68 (not in the drawing shown), so that the facility only with a very specific-> type of bottle corresponding to a specific selected anesthetic agent ' can be operated. '

In the following, the mode of operation of the device for; evaporation of a liquid anesthetic will be discussed in more detail, with initially no gas stream flowing through the evaporation chamber 12 and the shut-off valves 15 and 30 being in their closed position. In order to prepare the device for start-up , a bottle 66 with the selected anesthetic material is held against the sealing member 68 and fixed by means of the clamping screw 72

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clamped. The shut-off valve 15 is opened and the gas flow through the evaporation chamber 12 begins. Then the shut-off valve 30 opened, and one of the two pressure regulators 24 or /. 26 is adjusted by means of the manual settings 38 and 46 to establish a desired differential pressure between the lower end 20a and the upper end 20b of the liquid line 20. Pressurized gas from a gas pressure reservoir flows through the line pressure regulator 24, where the pressure is set to a selected one Pressure level drops, and then further through the pressure line 22 into the closed container 14. The pressure inside the container forces the liquid anesthetic through line 20 in the evaporation chamber 12, where it is on the diffusion plate or drips onto the diaphragm 6 4.

The gas flowing into the evaporation chamber 12 through the conduit 16 flows through the diffusion plate 64 and is mixed with the evaporating anesthetic. The gaseous mixture containing the anesthetic then flows through the outlet line 18 and via the back pressure regulator 26 to the apparatus using the gas mixture. The back pressure regulator maintains a selected pressure level in the W evaporation chamber 12. Even if the liquid level in the container 14 falls, the differential pressure between the ends 20a and 20b of the line 20, as determined by the pressure regulators 24 and 26, does not change, and the flow rate of anesthetic agent remains constant.

If it is desired to change the anesthetic or to replace the bottle 66, the shut-off valve 30 is closed and the pressure within the container 14 drops quickly thanks

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the vent line 54, whereby the liquid throughput through the line 20 also ceases. Since the container 14 is arranged below the evaporation chamber 12, occurs in the absence of Pressure inside the container also does not result in any liquid flowing through. In addition, the line 22, even if the bottle 66 is removed, rapidly emptied of liquid due to the action of gravity.

In one constructed in accordance with the present invention Apparatus was found to be the facility for Evaporation of liquid "odorants" for different Anesthetic agent could be used, and that the concentration of the anesthetic agent in the gas stream precisely over a wide range could be controlled or regulated. Additionally it was observed that the flow of anesthetic remained constant, although the liquid level in the container fell, and because of the new facility for "pressurization" of the container with a pressure line that runs below the surface of the liquid ends.

For example, in a device in accordance with the invention, the liquid conduit 20 had a capillary section about 1.25 cm in length and about 0.19 mm in diameter. The pressure regulator 24 was set so that _; the pressure on line 22 corresponds to 61 cm ViS or 58.8 mb. A stream of oxygen gas was passed through the evaporation chamber at a flow rate of 1000 ccn per minute. The container 14 was filled with a supply of liquid ether, and the counter-pressure regulator 26 was set so that it had a corresponding pressure in the interior of the evaporation chamber

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37.5 mb maintained. Liquid ether flowed into the vaporization chamber at a flow rate of 66 cm of gaseous ether per minute and was vaporized in the gas stream to produce an anesthetic mixture of 6.6% ether initial in oxygen.

The facility was still able to use other anesthetics and to work at other concentrations. For example, the container 14 was filled with a supply of liquid halothane filled, and the back pressure regulator 26 adjusted so that it maintained a pressure of 29.4 mb inside the evaporation chamber 12, while the other variables had the same values as in the previous example. Liquid halothane flowed into the vaporization chamber at a flow rate equivalent to 28 cm per minute in vapor form, creating a Anesthetic mixture of 2.8% halothane vapor in oxygen gave as the liquid in the gas stream evaporated.

It goes without saying that the two examples mentioned are only mentioned as examples and do not encompass the scope of the invention restrict.

In Fig. 2 there is now another embodiment of the device for evaporation or for gasification of a liquid anesthetic shown and generally designated 80 in accordance with the present invention. The facility 80 consists of an evaporation chamber designated throughout r.it 82 and a closed container, indicated generally at 84. A gas stream to which a vaporous anesthetic agent is to be added, passes through a shut-off valve 86 from

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a source of pressurized gas and through a line 88 into the vaporization chamber 82, where the gas stream is a vaporous Anesthetic is supplied. The anesthetic and the Gas mixtures leave the evaporation chamber 82 via a line 90 and are from there to a suitable apparatus / the Anesthetic mixture used, supplied.

As in the context of the explanation of FIG. 1 and FIG Device 10 described, the liquid anesthetic is forced to from the closed container 84 into the opening 92a of a liquid line located below the liquid level 92, and to flow into the evaporation chamber 82. with a flow rate that is independent of the altitude of the liquid level in the container 84. Corresponding of the invention, the container 84 is under pressure due to the pressure line 94, the lower end 94a of which communicates with the liquid container at a point in communication which is normal Operating conditions is below the liquid level of the liquid anesthetic.

The back pressure caused by this then causes, as already in the Detail in connection with the embodiment of Fig. 1 for a predetermined constant pressure on the pressure line 22 is described was emptying the liquid through the liquid line 92, the dynamic pressure, regardless of the altitude the liquid level in the container 84 remains constant.

The embodiment shown in Fig. 2 differs of the device 10 shown above, inasmuch as the liquid line 92 with the interior of the evaporation chamber

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is in communication via a metering valve 96. The metering valve 96 has an adjusting knob 98 with which the valve various different settings can be made, thereby reducing the flow of liquid from the container 84 in the evaporation chamber 92 opposite resistance of the valve 96 can be changed. The metering valve 96 can of be of the usual known type, for example an adjustable orifice plate valve or a valve of the type in which the Movement of the adjustment knob serves to change the effective length of a capillary passage.

In accordance with a feature of the invention, the amount of flow is of the anesthetic from the container 94 into the vaporization chamber 82, and thus the concentration of the liquor gas mixture by adjusting the differential pressure between the container 94 and the evaporation chamber 82 and / or by actuating the metering valve 96 regulated, whereby the resistance to the flow between the container 84 and the evaporation chamber 82 is changed. In the arrangement of FIG. 2, the device 80 for vaporizing a liquid narcotic is shown and explains how it can be used with an apparatus which uses the anesthetic mixture and which is of the type that it does keeps the pressure within the evaporation chamber 82 essentially constant, although a back pressure regulator similar to the pressure * controller 26 in Fig. 1 can be used if so desired. The differential pressure between the container 84 and the evaporation chamber 32 changed v / ground by regulating the pressure in the pressure line 94, with a line pressure regulator, which is gekennzeichne.t as a whole with the reference numeral 100 and has a pressure control valve 102, the input of which via a line

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device 104 is connected to the shut-off valve 86, and the output of which is connected to the pressure line 94. The pressure control valve 102 is set via a transfer lever arrangement 106 from the diaphragm 108, which in turn is influenced by / J ^ruc k, which prevails in the pressure line 94 and also by an oppositely acting spring 110, the tension of which can be adjusted by means of the manual adjustment 112.

i Since the flow rate of the liquid anesthetic in the line 92, and indeed for each particular setting of the metering valve 96, is proportional to the differential pressure between the container 84 and the evaporation chamber 92, this flow rate can be adjusted to a setting which the desired constant pressure within the pressure line 94 provides, can be set. A pressure display device 114 is connected to the pressure line 94 and enables the respective pressure to be read off or, if desired, a direct reading of the differential pressure between the container 84 and the evaporation chamber 82.

In the following, the structure of this evaporation chamber 82 is to be " are explained in more detail. It can be produced in any desired manner and is shown in FIG. 2 with a transparent cylindrical Wall part 116 shown, which above and above Absclilußkörper 113 and 120. These closure bodies are equipped with matching passages 88a, 90a, 92b, which the interior the evaporation chamber 82 with the lines 88, 90 and 92 connect. ,

So that the liquid anesthetic is in the vaporization chamber

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which can be evaporated into the flowing gas stream is a porous metallic diffusion plate or a Diaphragm 122 is provided which divides the evaporation chamber 82 into two parts. The gas stream passes through line 88 enters the chamber, flows through the plate 122 and through the exit line 90 to the apparatus, which the anesthetic gas mixture used. The liquid gas mixture, which reaches the evaporation chamber 82 via the line 92 II, falls onto the plate and is completely vaporized and absorbed by the gas stream flowing through this plate.

The liquid container 84 of the device 80 can be any desired Have construction; As shown, it consists of a container 124 which is closed by a sealing member 126 which is pressed onto the container by means of a suitable clamping device or other device (in not shown in the drawing). It should be noted that the device 80 of FIG. 2, of course, if that is desired, an arrangement as in the context of init the description of the device 10 shown in Fig. 1, umr grasp, the container being the original container for the liquid anesthesia.itte 1 represents and where the container and the Evaporation channels are combined into a single unit. In addition, the device 80 for vaporizing a liquid anesthetic can also have a limited ventilation line and with a pressure equalization line, similar to the lines and 53 of the device described in FIG. 1.

In operating the device 80 when a mixture of gas and

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Anesthetic is desired, the shut-off valve 86 is opened so that a gas flow through the vaporization chamber 82 and flows through the machine using the anesthetic mixture. The container 84 is a supply of liquid anesthetic and the metering valve 86 as well as the line pressure regulator 100, adjusted to preselected settings to achieve a to achieve the desired concentration of liquid anesthetic in the gas stream. The liquid anesthetic agent is .die | Liquid line 92 is pulled out of the container 84, and "" enters the evaporation chamber 82, where the liquid is completely evaporates in the gas stream and is absorbed by this. The effective back pressure within the container 84, the the conveyance of the liquid causes remains constant, even if the liquid level due to the fact that the container is pressurized by pressure line 94, "falls. Pressure line 94 terminates at 94a at a point below the Liquid level.

In the figures 3-7, a, another embodiment of the invention representing device for evaporation or for, Gasification of a liquid anesthetic described; this facility is generally provided with the reference number 140. As can best be seen in Fig. 3, where the device 114 is shown in more or less schematic form this facility again has an evaporation chamber, which is im whole is designated 142, and a container for the liquid Anesthetic, which is designated as a whole by 144. A gas stream, to which an anesthetic vapor is to be added, arrives von.einer pressurized gas source via a conventional shut-off valve 146 and through line 148 into the evaporation / Γ42. Within the

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: ■ ': ■' ■ '-''■^-'.: - '"■V>.: C ■ ■...." ■ BAD OFUGtHAL

A 37 964 m
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Evaporation chamber, a liquid anesthetic is evaporated and mixed with the gas stream, which is obtained from the gas and The gas mixture consisting of the anesthetic agent passes through the line 150 to an apparatus that continues to use the anesthetic mixture.

As has already been described in connection with the arrangements of FIGS. 1 and 2, the device 140 also works in such a way that it also supplies an anesthetic gas mixture of uniform concentration into the container 144, regardless of the liquid level of the anesthetic gas. Furthermore, the concentration is controlled very precisely and can be set over a wide range. In addition, and in accordance with a further feature of the invention, the device is then conveniently brought into a compact package form, with all control settings and connections being easily accessible. Furthermore, only a single manual setting is used to operate a new, double-acting valve, which regulates both the access of pressurized gas to the container and the amount of gas flowing through the line 148 into the evaporation chamber.

As can best be seen in FIGS. 4 and 5, the device 140 shown schematically in FIG. 3 is a compact one Assembly comprising a housing 152 on which the evaporation chamber 142 and the container 144 for the liquid anesthetic gas is easily accessible. Such a construction has the advantage that many parts of the apparatus in the housing 152 are securely enclosed, while the container 144, the chamber 142 and the necessary control settings your Operating personnel are easily accessible.

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The following is a more detailed description of the container 144 and the evaporation chamber 142, these elements being best shown in FIG. The evaporation chamber initially has an approximately bell-shaped closure hood 154, which is preferably made of glass or another transparent material. The closure hood 154 is held in place with respect to the base part 156 by a clamping ring 158 provided with a thread. The inside of the evaporation. chamber closure cap 154 is sealed by a pair of flange 160 a and 162, which are pressed together by the clamping ring 158 '. The lower part of the closure hood 154 is connected to the line 150 via a socket 164 which is screwed to an angled line 166. A pair of sealing rings 168 and 170 are provided above and below between the cap 154 and the mount 164, which are clamped between the mount and the angled line due to the tensioning effect.

So that a gas flow from the line 148 into the lower part of the The base 156 has a passage 148a extending from the lower surface of the base 156 extends into the interior of the evaporation chamber 142. f Between the passage 148a and the socket 164 is a porous one metallic diffusion plate, or a diaphragm 172 arranged, which extends across the evaporation chamber, and has the task of evaporating liquid anesthetic in the flowing To complete gas flow. The Diairagma 172 is about that Flange seal 162 and the clamping ring 164 held in place.

In accordance with a feature of the present invention, container 144 advantageously - and conveniently - conforms to the original.

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container or the original bottle in which the liquid anesthetic is delivered. As already stated above, this measure improves the handling and use of the device for the evaporation of a liquid anesthetic, greatly simplified. This simply puts the bottle in the facility 140 used that the bottle neck is screwed into an adapter part, which in turn is again in a shoulder 156a of the base part 156 is screwed. The bottle opening is sealed by connection to a sealing member or block 178 carrying an O-ring 180. It "understands goes without saying that different adapter parts 176 can be provided to different bottle types, different Contain anesthetic gas to be able to screw in. In this way, the evaporation device can be used universally, and the adapter part 176 is used to permit the use of a different anesthetic than that provided by the operator was intended to prevent. Since also both the evaporation chamber 142 and the container 144 are carried by the base part, the result is a unique, compact and easy-to-use partial equipment.

As with the devices 10 and 80 already described above for the evaporation of a liquid anesthetic Here, too, the emptying or transport of the liquid anesthetic contained in the container 144 by introducing a Pressurized gas, normally below the surface of the liquid, into the container 144. In this way, the amount flowing through and thus the concentration is maintained independently of the height of the liquid level in the container 144. The compressed gas is introduced into the container via a line 182, while

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the liquid anesthetic from the container into the vaporization chamber durch.eine capillary liquid line 184 passes. In accordance with a feature of the invention, lines 182 are and 184 are part of a unitary assembly carried by base 156, and are designated by reference numeral 186 throughout marked.

; ■■. ■ ■■■ "". '

As can be seen in more detail in FIG. 6 in particular, is the pressure gas line 182 with a passage 182a, which in the base part 156 is attached, in connection, The upper part of the conduit 182 is connected to the base part 156, during the The lower part is attached to a fitting 188 which has an outlet opening opening in the container 144. The liquid line 184 extends through passage 184a in the base 156 between the container 144 and the evaporation chamber 142. Inside the container 144 is the liquid line 182, which is only narrow and of capillary dimensions, preferably protected by a jacket tube or a tube 190, the ends of which are connected to the base part 156 and to the fitting piece 188 A flow to the liquid line 184 e takes place at the lower end 184a via a filter 192 attached to the fitting 188 is held by means of a screw-on cap 194.

Around the top of the liquid line 184 within the vaporization chamber 142 is another cladding tube 196 intended. The lowest part of this jacket tube 196 is on one Another fitting piece 198 is attached, which in turn through the porous metallic diffusion plate 142 with the base part 156 is screwed. The upper end of the cladding tube 196 in turn carries a gob guide 200, around which, from the upper end 184b of the

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Liquid line 194 to conduct liquid anesthetic agent outwardly away from the cladding tube 196, so that it finally falls on the diffusion plate 142.

To an excessive pressure build-up to prevent within the filled with anesthetic fluid container 144 due to the vaporization of the liquid anesthetic agent, a vent line of W is the container provided in the evaporation chamber 142 144th If too great a pressure increase occurs, the gas can pass from the container through a narrow hole 190a in the cladding tube 190 into the passage 184a in the base part 156. This gas is then vented into the evaporation chamber 142 through a narrow opening 202 in the fitting 198.

When through line 182 and through passage 182 pressurized gas is admitted into the container 144, the container 144 comes under pressure and the liquid anesthetic flows through the Filter assembly 192 and capillary line 184 into evaporation chamber 142, where it is on the diffusion plate and on, respectively fc is deposited on the diaphragm 172. A gas stream, which Mar- * Kosegas is to be added, enters the vaporization chamber through the opening 148a, and flows through the porous plate or the diaphragm 172. The liquid anesthetic that reaches this diffusion plate is vaporized or evaporated by the gas flow. evaporates and absorbed, and the resulting anesthetic gas mixture leaves the evaporation chamber through the socket 164, / angled line 166 and line 150.

One aspect of the present invention is in convenience to see in which the base part 156 together with the

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Evaporation chamber 142 and the container 144 can be quickly connected to the housing 152 or detached from it. Under special reference to Figs. 4 and 5 can be seen, that the housing has a horizontally extending support arm 204 "which is provided with a recess 2o6, which corresponds in shape to the projection 156a of the base part 156. On both sides of the recess 206 there are projecting flank parts 204 and 2O-4b of the support arm 204. To the To build the base part 146 together with the evaporation chamber 142, the base part 156 only needs to be pushed into the support arm 204 to become.

Finally, to make the connections with the internal passages 148a and 182a of the base 156, each passage terminates in a quick coupling nipple 2O8 or 210. These nipples 208 and 210 are slid from located in the arm flanks 204a and 204b Recesses 212 and 214 added. The recesses 212 and 214 are via passages 218 and 220 (see Fig. 6) with the line 148 and a pressure line 222 connected, which are only shown in FIG.

In order to then also releasably close the line 150 with the housing 152 connect line 150 to a slide fit connection 224 which fits on a fitting 226 (see Fig. 5). Consequently, the entire evaporator unit can thus be used at will easily connected to the housing or separated from the housing 152 will.

From Fig. 3 it can now be seen again that from a pressure · gas source originating pressurized gas of the pressurized gas line 222 via a Shut-off valve 146 is supplied. A total of 228

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Neter pressure regulator is used to control the pressure on the pressure line
To regulate 222; it can - if desired - be designed in accordance with the line pressure regulator 24 in FIG. 1. Additionally will
the pressurized gas in the pressurized gas line is controlled by a shut-off valve generally designated 230. The amount of gas / which flows through the line 148 can be generally with
232 designated throttle valve can be regulated.

According to an important partial feature of the present invention, the shut-off valve 230 is in the pressure line 222 and
the throttle valve 232 in line 148 is combined in a single valve assembly that is operated by a single, hand-closed
actuating control device is operated. An important one
The advantage of this new arrangement is that gas is supplied to the evaporation chamber at the moment the container is pressurized so that the evaporator does not flood
or is exposed to excessive excess liquid anesthetic. As can be seen in greater detail in FIG. 3, a single double-acting valve, generally designated 234, is provided there, which has a central bore 237 which forms a valve seat 238 for the shut-off valve 230. Additionally

P can also be an adjustable end screw in the bore 237 240 are screwed in, whereby a seat 242 for the throttle valve 232 is formed.

A valve part 244 is screwed into the other end of the bore 237 in order to control the opening and closing of both valves 230 and 230. The valve part 244 has a first stepped valve surface 244a which is connected to the valve seat 238
occurs, and a second recessed surface 244b that coincides with the
Seat 242 contacts. An actuator 244c of the

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Valve member 244 is equipped with an adjustment knob 246 (see Fig. 7) can be provided to the valve surfaces 244a and 244b in connection with the valve seats or to separate with the two valve seats 238 and 242. The locking screw 240 is preferably set so that that then, when valve 230 is fully closed, that too Valve 232 is closed. ·

If the adjusting knob 246 is turned to switch the valves 230 and 232 to open, then the pressure line shut-off valve 230 moves very quickly to its fully .opened position, and because of the relatively steep transition (strongly conical shape) of surface 244a. Meanwhile, the throttle valve 232 opens only gradually, and only because of the relatively speaking slowly tapering shape of surface 244b. It is thus possible, with a single operating handle 246, the double-acting valve both in terms of its blocking properties for the Adjust the pressure line as well as with regard to its throttle properties.

According to a feature of the invention, the flow rate of liquid anesthetic agent through the liquid line 184 and consequently the concentration of anesthetic gas in the mixture is adjusted by monitoring the differential pressure between the opposite ends of the liquid line 184. The pressure regulator 228 monitors the pressurized gas that is supplied to the container 144 via the pressurized gas line 222. Similarly, a back pressure regulator 248 monitors the pressure in the line 150, and thus the pressure in the vaporization chamber 142 at the top of the liquid line 184. If desired, the back pressure regulator 248 can be constructed in its construction like the back pressure regulator 26, which is shown in detail in FIG is, correspond or be similar.

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A regulation of the flow rate of liquid anesthetic agent through the liquid line 184 is achieved by adjusting one or both pressure regulators 228 and 248. In the illustrated embodiment of the invention, the back pressure regulator 248 is normally set by the operator to reduce the flow rate and thus the concentration, while the line pressure regulator 228 is normally preset t or has already been set to a certain position * 'at the factory . In order to be able to set the flow rate conveniently, an operating button 250 for the pressure regulator 243 is attached to the front housing part 152 at an easily accessible location. The pressure regulator 228 may be located behind a removable plate in a side wall of the housing 252 (see FIG. 7). According to FIG. 3, a differential pressure meter 252 is installed between the pressure line 222 and the line 150 and indicates a differential pressure which is proportional to the flow rate through the liquid line 184. Conveniently, this differential pressure gauge is mounted on the housing 152 above the "operating knob 250, it will be understood that -. If desired - also a Flußanzeiger v built into the system / ground ψ can, for example, in line 148 or in line 150, in accordance with the usual Practice.

A convenient connection of the line 148 and the pressure regulator with the line 254 (see FIG. 3), which via a conventional shut-off valve 146 is connected to a source of pressurized gas, v / ird err made possible by a quick-release socket 256 which is attached to the front of the housing 152 (see FIG. 7). By using a single gas source ensures that the vaporizer always receives a gas flow when the gas pressure container is below

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Pressure is on. A connection of the back pressure regulator 248 by means of a line 258 to the apparatus used for the anesthetic gas mixture is made possible by another quick coupling connection 260 on the housing 152.

The mode of operation of the device 140 for vaporizing a liquid carcose agent is clear to those skilled in the art from the preceding detailed description. Assume first that the shut-off valve 146, the valve 230 and the valve 232 are all in their closed positions and the device 140 is not in operation. In order to prepare the device for commissioning, a bottle advising a selected anesthetic is connected to the base part 156 with the aid of a suitable adapter 176. The vaporizer unit is connected to the housing 152 of the device 140 either before or after the bottle with the anesthetic has been attached to it.

For start-up, the shut-off valve 146 is opened in order to supply compressed gas to the device 140 via the socket 256 on the front part of the housing 152. The adjustment knob 246 for the valves 230 and 232 is then opened to bring the / ibsperrventil 230 to its fully open position, and to open the throttle valve 1 230 to such an extent that flow through the line 14 J; _:. if you want! 'tightness takes place. The back pressure regulator 248 is adjusted by actuating the control button 250 until the display on the differential pressure gauge 252 shows that the desired flow rate of liquid ilarkic agent has been reached.

Pressurized gas then flows from line 1.48 through the evaporation chamber and via line 150 through the back pressure regulator

0 0 9 3 & T / 1 _f? 3 γ,

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248 to the apparatus used for the finished mixture of marcose gas. At the same time, the container / and the liquid anesthetic are pressurized by the pressure permitted via the line 222 ttel is pressed through the liquid line 184 into the evaporation chamber, where it evaporates into the gas flow and is recorded.

In the case of a device for vaporizing a liquid anesthetic, similar to device 140 and built in accordance with the present invention, it was found that various anesthetic fluids such as ether, halothane, trichlorethylene and methoxyflurane with extreme accuracy and mixed with oxygen within a very wide adjustable range with regard to the concentration ratio It was found that the flow rate of anesthetic in the Verdanpferkanimer are carefully checked could, regardless of the fluid level, due to of the pressure drop between the pressure line 222 and the line 150, as shown as a display on the differential pressure meter 252 revealed. This pressure drop could easily be controlled by adjusting the pressure regulator 243. For example, 'resulted as the ratio of the flow of different macrophage fluids approximately the following equations for the pressure drop:

F _e «-20 + 4ΔΡ

F _h = -21.5 + 1.7Λ
F _t = -21 + 1.9 AP
F _m = -6.75 + 784 P.

In these equations, the notations F, F., F. and F the flow rate in er. "/ n of vaporous Xther, Halothane, Trichlorethylene and methoxyflurane represent while the term

009831/1173 - 37. -

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ΔΡ represents the pressure drop between the pressure line 222 and the output line 150, in the unit 1 inch of water / which corresponds to a value of 2.49 mb. Since the flow through line 184 is determined by the rules of laminar flow, the flow is essentially a linear function of the pressure drop within the pressure working areas , which range from 15 to about 80 inches of water, ie from 37.5 to approx. 200 mb stretch.

It can be seen that the concentration of the anesthetic gas mixture accurate · and convenient over a wide concentration range only by adjusting the pressure drop and the flow rate can be controlled through the evaporation chamber- Is at ^ For example, ether is used and the valve 232 is set in such a way that that an oxygen flow through the evaporation chamber of approx. 2000 cm / m is achieved, while the pressure drop to about 111 mb is adjusted, then there is a concentration of approx. 8% ether in oxygen. If, on the other hand, methoxyflurane is used, and is oxygen through the evaporation chamber with a flow

3 ·

speed guided by 6000 cm / m, and the pressure drop is set to about 50 mb, then results in a concentration of 0.34%.

Of course, these examples do not represent any limitation of the The scope of the present invention, since there are many modifications and changes based on the spirit of the invention are conceivable.

00 3 8 31/117 3 '■ ^=: bad original

Claims (1)

DR.-ΙΝβ. YOU »L.-IN ·, M. tC. '' DI ^ L.-PM * ·. OK. DIPL.-FHYf. HÖGER - LEGAL RIGHT- GRIESSBACH - HAECKER PATENT LAWYERS IN STUTTOART 9 Ω Ω ^ Ω Τ 6 SB A 37 964 in a - 123 April 14, 197Ο (P 20 03 Ο36.8) New 'patent claims 1. A method for producing an anesthetic gas mixture from the vapor of a liquid anesthetic from an anesthetic container and a gas flow, characterized in that a gas flow through a line (20) with the container (14) communicating evaporation area (12) is passed and that a pressurized gas is supplied to the container (14) containing the liquid anesthetic below the liquid surface in order to circulate the liquid anesthetic to force the connecting line (20) to flow away into the evaporation area. 2. The method according to claim 1, characterized in that the ^ Pressure difference between the point of introduction (22a) of the pressure • "gases in the container (14) and the evaporation area (12) regulated is to measure the amount of anesthetic flowing through the connecting line (20). 3. The method according to claim 1 and / or 2, characterized in that that in connection with the regulation of the pressure difference, the pressure of the pressurized gas supplied to the container and the pressure the gas flow is regulated. (4. J anesthesia machine for producing an anesthetic gas mixture by mixing an anesthetic vapor with a gas stream, for performing the method according to claims 1-3 »characterized in that an evaporation chamber (12, 82, l4l) is provided, 009831/1173 A 37 964 m
a - 123:
1 * 1. April 1970 from which a liquid line (20, 92, 184, 190) extends into the evaporation chamber, and. that means are provided which allow the closed container (1-4, 84, 144) to be pressurized in such a way that the supply of liquid anesthetic gradually over the liquid line (20, 190) with a, of the respective height the flow rate independent of the liquid level emptied into the evaporation chamber. 5. anesthesia machine according to claim 4 ,. characterized in that a pressure line (22, 94, 182) is provided, which with the Container (14, 84, 144) for the liquid anesthetic is in communication and a pressurized gas below the surface of the Introduces liquid level into the container. 6. Anesthesia machine according to claim 4 and 5, characterized that adjustable devices (24, 100, 26, 248) for regulating the differential pressure between the inlet point (22a, 94a) of the compressed gas in the container (14, 84, 1.44) 'and the evaporation chamber (12, 82, 142) are provided in such a way that the flow rate of the liquid through the liquid line | (20, 92, 184, 190) can be regulated. 7. Anesthesia machine according to claim 6, characterized in that the adjustable devices consist of a pressure regulator (24, 100) which is connected to the pressure line (22, 94). for setting the pressure at the discharge point in connection. .8 »Anesthesia machine according to claim 6, characterized in that in the outlet lines connected to the "evaporation chamber" (18, 90 ^ 15O) VeIn another · pressure regulator "(26, 248) before BATH ORIGINAL A 37 961 m a - 123 April 14, 1970 you can see the pressure inside the evaporation chamber regulates. 9. Anesthesia machine according to claim 4-8, characterized in that in the connecting liquid line (2O ₃ 92, 184, 190) between the evaporation chamber and the vessel for the liquid anesthetic, a metering valve (96) is provided to resist the flow of the liquid anesthetic in the connecting line (92) to change. 10. Anesthesia machine according to claim 4 - 9. » characterized in that further adjustable means (228, 234) are provided in order to regulate the differential pressure between the inlet point for the pressurized gas in the container and the interior of the evaporation chamber. 11. Anesthesia machine according to claim 4 - 10, characterized in that. that the vaporization chamber (12, 82, 142) wall portions forming (56, 60; 116, 118, 120; 154, 156) are provided ,, (, l48a _s 88a 16a) are in soft them passages for the gas flow and that Sealing means (162, 160) for connecting the. Wall _; parts are provided, and that a device (70, 72, 176) for pressing the container containing the liquid anesthetic against a further sealing means (68, 178) is provided. 12. Anesthesia machine according to claim 4-11, characterized in that one, separate from the other parts, the evaporation chamber and the container for the liquid anesthetic .sende assembly is provided (Fig. 6) projecting from the usual 009831/1173 ORIGINAL INSPECTED A 37 964 in April 14, 1970 rigen, in a housing (152) combined parts separable and "via corresponding connecting pieces (support arm 204, connection 210 and corresponding recesses 112, 214) can be reattached is. , 13. Anesthesia machine according to claim 12, "characterized in that "'" "for securing containers containing liquid anesthetic (144) of any size to fit a base part (156) "- ■ send, exchangeable adapters (176) are provided, in which" the anesthetic gas container can be fastened, preferably screwed in. · 14. Anesthesia machine according to 'claim 4-13> characterized in that a device for forming a Entlüikurgspfades (ventilation pipe 54) is provided between the container for the liquid anesthetic and the evaporation chamber, if necessary to vent an excess pressure occurring in the container into the evaporation chamber. 15. Anesthesia machine according to claim 4 - l4, characterized in that that a pressure equalization line (53) is provided between the evaporation i chamber and the line pressure controller (24) which regulates the pressure in the line leading to the reservoir pressure line (22) to compensate for pressure variations in the evaporation chamber. 16. Anesthesia apparatus according to claim 4-15, characterized in that a double-acting control valve device (234) is provided which consists of a first valve (232) which
Xn öie line (.148.) For feeding a gas stream into the 'Evaporation chamber (i42> is switched on and off / a second 9 8 31/1 Π3 A 37 964 m a - 123 April 14, 1970 Valve (230) which is connected in the line (222) for supplying a pressurized gas into the container (IhH) with the liquid anesthetic and that a single, manually operated device is provided for the simultaneous opening of both the first and the second valve . 17. Anesthesia machine according to claim 16, characterized in that the control valve device (23 * 1) consists of a single valve bore (237), which has two valve seats (238, 242) and that a single movable valve part (244) in the Bore is provided which has stepped surfaces (244a, 244b) which are used for closing the valves with the valve seats get in contact. 18. Anesthesia machine according to claim 16 and 17 > characterized in that the stepped surfaces (244a, 244b) of the valve part are built or taper so that one valve as a shut-off valve (230) and the other valve as a throttle valve (232) is working. 009831/1173