JP2009011505A - Simple inhalation anesthesia device and multistage type simple inhalation anesthesia apparatus equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple inhalation anesthesia apparatus which is simple in structure and light in weight, in which the amount of anesthetic gas used is reduced, and in which many kinds of anesthetics can be used. <P>SOLUTION: The anesthesia apparatus 20 includes: an anesthetic gas generator 5 and an anesthetic gas generator 5a for generating an anesthetic gas; a chamber 7 where an object to be put under an anesthetic by the anesthetic gas is accommodated; and an anesthesia maintenance mask 8. The anesthetic gas generator 5 is provided with a bubbling device for generating the anesthetic gas by introducing bubbles into the anesthetics. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an anesthesia apparatus and a multistage simple inhalation anesthesia apparatus including the anesthesia apparatus, and more particularly to an anesthesia apparatus that can be suitably used for animal experiments.

  Conventionally, inhalation anesthesia has been used as a method for anesthetizing animals in experiments and surgery. This inhalation anesthesia method is a method in which a vaporized anesthetic is inhaled from the mouth or nose of an animal. This method is generally used because it is not necessary to use injection or the like and anesthesia can be performed relatively easily.

  As an anesthetic used in the inhalation anesthesia method, an ether anesthetic such as diethyl ether and sevoflurane is used. Moreover, since the ether type anesthetic which uses an anesthetic for a patient is used, as an apparatus which supplies gaseous ether, the apparatus which supplies gaseous ether from a vaporizer or the gas cylinder etc. in which ether was stored is mentioned.

  As a structure of the anesthesia apparatus for small animals used conventionally, the structure by which the absorbent cotton etc. which soaked the anesthetic in the sealed container is arrange | positioned is mentioned. Small animals are introduced into the container and anesthetized with anesthetic gas gradually vaporized from the absorbent cotton. Although this conventional anesthesia apparatus has a merit that it has a simple structure, it has a demerit that it is very difficult to adjust the concentration of the anesthetic gas because anesthetic gas is generated by vaporizing the anesthetic. .

  Then, the anesthesia apparatus provided with the vaporizer for generating anesthesia gas is disclosed by patent document 1-patent document 4, for example. First, Patent Document 1 discloses an animal anesthesia apparatus that vaporizes an anesthetic with a vaporizer. In this anesthesia apparatus, since the anesthetic and oxygen are mixed in the vaporizer, it is possible to suppress the concentration of the anesthetic gas from becoming too high. The anesthesia apparatus includes a microcomputer, and the opening and closing of the exhalation valve is appropriately adjusted based on the weight of the animal undergoing anesthesia, so that appropriate anesthesia can be performed.

  As another anesthesia apparatus, Patent Document 2 discloses an anesthesia apparatus that includes an artificial respiration apparatus and a vaporization unit, and further includes a thermal mass flow controller. The thermal mass flow controller can adjust the flow rate of the anesthetic necessary for the controlled air flow rate when the concentration of the anesthetic gas is set, and does not require a carrier gas.

  Furthermore, as another anesthesia apparatus, for example, Patent Document 3 discloses an inhalation gas supply device including a plurality of air supply tubes. According to this inhalation gas supply device, the inhalation gas discharged from one supply gas generator can be simultaneously supplied to a plurality of small animals. Inhalation gas is supplied to small animals by a ventilator.

  Since the thermal mass flow controller and the ventilator in Patent Document 2 and Patent Document 3 are provided, the anesthesia apparatus in these documents tends to be large and heavy.

  Since the anesthesia apparatus is often used indoors such as a laboratory or an operating room, the weight of the anesthesia apparatus is not usually considered as important. However, in recent years, there are increasing cases of delivery services for anesthetizing patients and animals outside the laboratory or operating room, and cases where anesthesia is performed in an examination room or the like. In such a case, it is important that the anesthesia apparatus is lightweight.

About the weight reduction of an anesthesia apparatus, the patent document 4 discloses that it can be solved by using an electronically controlled vaporizer. Specifically, a transportable anesthesia apparatus equipped with a small and light vaporizer that prevents fluctuations in anesthetic concentration is disclosed.
JP 2000-185061 A (published July 4, 2000) Japanese Patent Laying-Open No. 2005-279218 (published on October 13, 2005) JP 2006-288560 A (released on October 26, 2006) JP 2004-236874 A (released August 26, 2004)

  However, the anesthesia apparatus disclosed in Patent Documents 1 to 4 has been a hindrance in using many types of anesthetics due to the complexity of the apparatus and the process.

  Specifically, an anesthesia device equipped with a vaporizer is set to vaporize an anesthetic according to the type of anesthetic, and if the type of anesthetic is changed, it is necessary to use another anesthetic device separately. There was a problem that there was.

  In particular, when anesthetics are used for animal experiments, in order to obtain more data, there is a demand not only to change the concentration of anesthetics but also to use various anesthetics. In order to satisfy this point, it is necessary to use a plurality of anesthesia apparatuses in the conventional anesthesia apparatus, and lacks simplicity in using various anesthetics.

  The present invention has been made in view of the above-described conventional problems, and has an object of simple structure and light weight, which can reduce the amount of anesthetic gas used and can use various kinds of anesthetics. It is to provide an inhalation anesthesia device.

  A simple inhalation anesthesia apparatus of the present invention is a simple inhalation anesthesia apparatus comprising an anesthetic gas generator for generating an anesthetic gas and a container for accommodating a subject to receive anesthesia, The anesthetic gas generator includes a bubbling device that generates anesthetic gas by introducing bubbles into the anesthetic.

  According to said invention, the anesthetic gas generator is equipped with the bubbling apparatus which introduces a bubble to an anesthetic, and an anesthetic is vaporized by bubble introduction. Therefore, according to the simple inhalation anesthesia apparatus, an anesthesia is performed on a subject to be anesthetized at a desired anesthetic gas concentration without generating a high concentration of anesthetic gas and hardly causing an uneven concentration of the anesthetic gas. Is easy. For this reason, the subject who receives anesthesia does not excessively inhale the anesthetic gas, and hardly affects the condition of the animal. In addition, the bubbling device can be used for many types of anesthetics, and the simple inhalation anesthesia device can handle various types of anesthetics.

  In addition, the bubbling device is cheaper and lighter than the vaporizer used in the conventional anesthesia device, which is very expensive.

  Therefore, the simple inhalation anesthesia apparatus according to the present invention including this is lighter than an anesthesia apparatus using a conventional vaporizer and is excellent in cost.

  In the simple inhalation anesthesia apparatus of the present invention, it is preferable to include a respiratory gas pump for supplying a respiratory gas to the anesthetic gas.

  Thereby, it becomes possible to adjust by supplying the breathing gas to the anesthetic gas generated by the anesthetic gas generator and diluting the concentration of the anesthetic gas.

  Moreover, in the simple inhalation anesthesia apparatus of this invention, it is preferable that the said storage container is an anesthesia maintenance mask which has an opening part which can insert the nose part of the object which receives anesthesia.

  With such a simple inhalation anesthesia apparatus, only the target nose can be placed on the anesthesia maintenance mask. That is, it is not necessary to store the whole body of the object in the storage container. Thereby, the volume of an anesthesia container can be reduced, and the simple inhalation anesthesia apparatus further reduced in size and weight can be provided. It also saves the necessary anesthetic because the volume to be filled with the same anesthetic gas concentration is reduced.

  Moreover, in the simple inhalation anesthesia apparatus of this invention, it is preferable that the cover part with which the said storage container is provided is a slide type.

  Thereby, since the sealing property of the anesthetic gas in the storage container can be improved, the amount of the anesthetic used can be further reduced.

  Moreover, in the simple inhalation anesthesia apparatus of this invention, it is preferable to have a filter which collects the anesthetic gas introduced into the said storage container.

  Thereby, since the anesthetic gas remaining in the container is collected by the filter, the harmless gas is discharged from the anesthetic device. That is, a simple inhalation anesthesia apparatus with higher safety can be provided.

  The multistage simple inhalation anesthesia apparatus of the present invention includes a plurality of the above simple inhalation anesthesia apparatuses.

  For this reason, the said simple inhalation anesthesia apparatus can be combined according to a use, and a desired multistage type simple inhalation anesthesia apparatus can be provided.

  As described above, a simple inhalation anesthesia apparatus according to the present invention is a simple inhalation anesthesia apparatus including an anesthesia gas generator for generating anesthesia gas and a storage container in which a subject to receive anesthesia is accommodated. The generator includes a bubbling device that generates anesthetic gas by introducing air bubbles into the anesthetic.

  Therefore, since the anesthesia gas generator includes a bubbling device, the simple inhalation anesthesia device according to the present invention has a simple structure and is light in weight, reduces the amount of anesthetic gas used, and an appropriate concentration of anesthetic gas. The subject can be anesthetized. In addition, the bubbling device can be used for many types of anesthetics, and the simple inhalation anesthesia device can handle various types of anesthetics.

<Configuration of anesthesia device>
An embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a schematic view of an anesthesia apparatus (simple inhalation anesthesia apparatus) 20 according to the present invention. Each component provided in the anesthesia apparatus 20 is connected by a flexible tube made of plastic or the like. In addition, you may use piping about the connection part for which intensity | strength is calculated | required. Hereinafter, the anesthesia apparatus 20 and each component provided therein will be described.

  The anesthesia apparatus 20 shown in the figure is roughly classified into two paths: a path for anesthesia using a chamber (accommodating container) 7 and a path for anesthesia using an anesthetic maintenance mask (accommodating container) 8. It has.

  The anesthesia apparatus 20 includes a respiratory gas pump 1 and an anesthetic gas pump 2 as paths for performing anesthesia using the chamber 7. The respiratory gas pump 1 and the anesthetic gas pump 2 are connected to a flow meter valve 3 and a flow meter valve 4, respectively. The flow meter valve 3 is further connected to the chamber 7. On the other hand, the flow meter valve 4 merges with the pipe connected to the flow meter valve 3 via the anesthetic gas generator 5 and is connected to the chamber 7.

  On the other hand, the anesthesia apparatus 20 has a respiratory gas pump 1a, an anesthetic gas pump 2a, and a flow meter valve in the same manner as the path for anesthesia using the chamber 7 as the path for performing anesthesia using the mask 8 for maintaining anesthesia. 3a and a flow meter valve 4a. The tubes connected to the flow meter valve 3a and the flow meter valve 4a are joined together and connected to the anesthesia maintenance mask 8. Furthermore, the chamber 7 and the anesthesia maintenance mask 8 are sequentially connected to an activated carbon filter (filter) 11 and a suction pump 12.

  The breathing gas pump 1 blows a breathing gas such as oxygen or air that can be breathed by a subject to be anesthetized in order to adjust the concentration of the anesthetic gas generated in the anesthetic gas generator 5 to be described later. Yes, a known pump can be used. It is preferable to use a small and light pump. As specific examples, a diaphragm pump, a tubing pump, a screw pump, a vane pump, a piston pump, a plunger pump, or the like can be used. As the breathing gas, air is preferably used from the viewpoint of economy and convenience, and an oxygen cylinder or the like does not need to be used.

  The same applies to the respiratory gas pump 1a, the anesthetic gas pump 2 and the anesthetic gas pump 2a. The anesthesia apparatus 20 is provided with the above-described plurality of pumps. However, by providing a pump with a small volume generated during operation, noise during operation is small, and it has an effect of causing discomfort to laboratory animals to be anesthetized. Can be reduced.

  The flow meter valve 3 is a member for adjusting the flow rate of the breathing gas blown from the breathing gas pump 1 and sending it out. The flow meter valve 3 is adjusted as appropriate depending on the type of anesthetic used, the amount of anesthetic gas generated, and the amount of mixed anesthetic gas 6 inhaled by the subject to be anesthetized. A known flow meter valve can be used as the flow meter valve 3, and the same applies to the flow meter valve 3a, the flow meter valve 4, and the flow meter valve 4a.

  The anesthetic gas generator 5 generates anesthetic gas. This is not a conventionally used vaporizer with heating, but a bubbling device. The anesthetic gas generator 5 stores a liquid anesthetic. The bubbling device has a function of vaporizing the anesthetic by introducing bubbles such as air into the anesthetic.

  Since the anesthetic gas generator 5 provided with the bubbling device is configured to vaporize the anesthetic without heating, it does not need to have heat resistance unlike the conventional vaporizer and does not need to have a heat source. Therefore, the anesthetic gas generator 5 is lighter than a conventional vaporizer. In addition, since the anesthetic gas generator 5 vaporizes the anesthetic by introducing bubbles, the concentration of the vaporized anesthetic gas does not become too high, and it is easy to adjust the concentration of the anesthetic gas. Furthermore, the bubbling device is cheaper than the vaporizer, which is very expensive. In addition, the bubbling device can be used for many kinds of anesthetics, and the anesthetic device 20 can cope with a case where various kinds of anesthetics are used.

  Therefore, the anesthesia apparatus 20 including the anesthesia gas generator 5 is lightweight, can reduce the amount of anesthesia gas used, and can anesthetize the subject with an appropriate anesthetic gas concentration. It is also very beneficial that the manufacturing cost can be reduced. The cost aspect will be specifically described. In the conventional anesthesia apparatus, the vaporizer is very expensive, and such an anesthesia apparatus is sold for 2 to 3 million yen or more. On the other hand, in the anesthesia apparatus according to the present embodiment, the vaporizer is not used, and an anesthetic gas generator including an inexpensive bubbling device is used. Therefore, the price is reduced to about 1/10. Is possible.

  The concentration of the anesthetic gas used in the present invention is appropriately changed depending on the type of anesthetic used, the type and quantity of the object to be anesthetized, and cannot be clearly defined. For example, when anesthetized subject is 1 mouse each using isoflurane, 1.0% to 2.5%, when using halothane, 0.75% to 2.0%, sevoflurane When 2.5 is used, the concentration range is 2.5% to 4.0%, and when methoxyflurane is used, the concentration range is 0.5% to 1.5%.

  Anesthesia includes induction anesthesia for anesthesia (hereinafter referred to as “subject” as appropriate) and maintenance anesthesia for maintaining the anesthesia state of the subject subjected to induction anesthesia. In the case of induction anesthesia in which an anesthesia is performed on a non-anesthetized subject, a higher concentration of anesthetic gas is used than in the case of maintenance anesthesia. For example, when sevoflurane is used, the subject can be anesthetized at a concentration of 4.0% for induction anesthesia and 2-3% for maintenance anesthesia.

  The concentration of the anesthetic gas to be generated can be appropriately adjusted depending on the type and amount of anesthetic used and the degree of bubble introduction by a bubbling device.

  Various known pumps can be used as the bubbling device, and it is preferable to use a small and lightweight pump. As a specific example, a diaphragm pump, an air pump, a tubing pump, a screw pump, a vane pump, a piston pump, a plunger pump, or the like can be used.

  The anesthetic is not particularly limited as long as it can be appropriately vaporized, and for example, isoflurane, halothane, sevoflurane, enflurane, methoxyflurane, desflurane and the like can be used. In addition, in order to supply the said anesthetic to the anesthetic gas generator 5, it can also be set as the structure with which the commercially available inhalation anesthetic bottle is directly mounted | worn. This increases the convenience of the anesthesia apparatus 20 and can be said to be a preferable configuration.

  The mixed anesthetic gas 6 is formed by mixing the air sent from the flow meter valve 3 and the anesthetic gas sent from the anesthetic gas generator 5, and the mixing is connected to the flow meter valve 3 and the anesthetic gas generator 5. This is done at the position where the tubes meet. The mixing of the air and the anesthetic gas is performed to adjust the concentration of the anesthetic gas by lowering the concentration of the anesthetic gas. When the concentration of the anesthetic gas in the anesthetic gas generator 5 becomes low, the flow rate is set. The amount of air sent from the meter valve 3 may be reduced or zero.

  The chamber 7 is a container for accommodating a target object. In the chamber 7, introduction anesthesia for performing anesthesia on a subject that is not anesthetized is performed. The object subjected to anesthesia in the chamber 7 is transferred to the anesthesia maintenance mask 8 and subjected to maintenance anesthesia.

  The chamber 7 has a structure in which the mixed anesthetic gas 6 to be introduced does not leak outside the flow meter valve 3, the flow meter valve 4, or the activated carbon filter 11, and is a box shape in the figure. The shape of the chamber 7 is not limited to a box shape as a matter of course, as long as it has a structure satisfying the function.

  Further, at least a part of the chamber 7 is made of a transparent member such as glass or plastic so that it can be confirmed whether or not the subject has been anesthetized. The upper part of the chamber 7 is provided with a gas inlet for receiving the supply of the mixed anesthetic gas 6, and the lower part of the chamber 7 is provided with an exhaust outlet for discharging the remaining mixed anesthetic gas 6. Are arranged diagonally. Due to such a positional relationship, the introduced mixed anesthetic gas 6 generates an air flow and can be stirred in the chamber 7.

  The lid provided in the chamber 7 for introducing the object is not particularly limited, but is preferably a slide type. Thereby, for example, the mixed anesthetic gas 6 can be prevented from leaking out of the chamber 7 as compared with the case where the lid portion is a drawer type, and the amount of anesthetic used can be further reduced. Moreover, the capacity | capacitance of the chamber 7 is changed by the magnitude | size, quantity, etc. of object, and is not specifically limited. According to the chamber 7, since the whole body of the object can be accommodated, it is not necessary to fix the object, and anesthesia can be easily performed.

  Although the chamber 7 is installed in only one place, it is not limited to the number of installations, and a plurality of chambers 7 may be installed. As an example, the tube through which the mixed anesthetic gas 6 passes is divided into a plurality, and a plurality of chambers 7 can be arranged in parallel. According to this configuration, the mixed anesthetic gas 6 having the same concentration can be introduced into the plurality of chambers 7, and the subject can be anesthetized under the same conditions in each chamber.

  Moreover, it can also be set as the structure by which the some chamber 7 was arrange | positioned in series. In the chamber 7 arranged downstream, the concentration of the mixed anesthetic gas 6 will decrease. However, when anesthesia is performed on subjects with different necessary suction amounts, for example, rats and mice, a larger amount of inhalation is required. The mixed anesthetic gas 6 can be used efficiently by accommodating the required rat in the upstream chamber 7 and storing the mouse whose amount of inhalation is smaller than that of the rat in the downstream chamber 7. It is of course possible to combine the parallel and series arrangements of the chambers 7.

  The chamber 7 has a structure that can be detached from the anesthesia apparatus 20. For this reason, the part which the target object touched can be wash | cleaned or disinfected easily, and it is excellent also in the sanitary surface.

  The object itself accommodated in the chamber 7 does not include any device and sucks the mixed anesthetic gas 6 introduced by its own breathing. That is, the operator simply puts the target object into the chamber 7 and does not need to perform complicated actions directly on the target object, so that the anesthesia apparatus 20 that is easy to use can be provided.

  The anesthesia maintenance mask 8 is a container for accommodating the object as in the chamber 7. The anesthesia maintenance mask 8 is mainly used for performing maintenance anesthesia on a subject that has been subjected to introduction anesthesia in the chamber 7. The anesthesia maintaining mask 8 has an introduction port 10a, which is connected to the flow meter valve 3a and the anesthetic gas generator 5a. Further, an exhaust port 10 is formed in the upper part of the anesthesia maintenance mask 8, and the anesthesia maintenance mask 8 and the activated carbon filter 11 are connected to each other. Further, the anesthesia maintenance mask 8 includes an opening 9. The opening 9 has a shape in which the nose of the object can be inserted.

  FIG. 2 is a schematic view showing the anesthesia maintenance mask 8. As shown in the figure, an inlet 10a for introducing the mixed anesthetic gas 6a is formed in the upper part of the anesthesia maintaining mask 8, and the mixed anesthetic gas 6a is exhausted in the lower part of the anesthetic maintaining mask 8 3. There are provided a plurality of exhaust ports 10 (one exhaust port 10 is not shown because it is provided on the back side of the anesthesia maintaining mask 8 shown in the figure) and an opening 9. For convenience of explanation, the opening 9 is configured to have one location, but is not particularly limited to this installation location, and may be configured to be installed at a plurality of locations.

  Since a plurality of exhaust ports 10 are provided below the anesthesia maintenance mask 8, the mixed anesthetic gas 6a introduced from the introduction port 10a can be filled in the anesthesia maintenance mask 8 at a uniform concentration. In addition, the arrow direction in the figure shows the moving direction of the mixed anesthetic gas 6a. The opening 9 is formed in a larger shape than the periphery of the nose of the object so as not to be in close contact with the periphery of the nose of the object. In addition, the shape of the opening 9 may be changed as appropriate, for example, if the target body is a rat, the shape may be larger than that of the mouse.

  Moreover, it is preferable that the whole anesthesia maintaining mask 8 does not move and has a structure capable of being stably and independently standing. With such a structure, the operator does not need to fix the anesthesia maintaining mask 8 and can easily anesthetize the object. As in the chamber 7, at least a part of the anesthesia maintenance mask 8 is made of a transparent member such as glass or plastic so that it can be confirmed whether or not the subject has been anesthetized.

  FIG. 3 is a schematic view in which a mouse M is placed on the anesthesia maintenance mask 8. As shown in the figure, only the nose of the mouse M is accommodated in the anesthesia maintenance mask 8, and the trunk of the mouse M is not accommodated. Furthermore, since the opening 9 is formed in a shape larger than the periphery of the nose of the mouse M, a gap is generated between the opening 9 and the periphery of the nose of the mouse M. As described above, since the anesthesia maintaining mask 8 is a semi-open type with a gap, even if the internal pressure of the anesthesia apparatus 20 is increased, adverse effects on the lungs of the mouse M can be reduced.

  According to the configuration using the mask 8 for maintaining anesthesia, the entire body of the object need not be accommodated, so that the volume of the entire anesthesia apparatus 20 can be reduced. In order to fix the mouse M, although not shown, a fixing member such as a belt may be used, or the mouse M may be fixed by an operator's hand. Since the amount of suction of the mixed anesthetic gas 6 that the subject inhales is constant, the amount of the anesthetic used in the anesthetic gas generator 5 can be reduced by reducing the volume of the anesthetic device 20.

  Since anesthetics are expensive, it is very important to reduce the amount of anesthetic used. Moreover, although the usage-amount of an anesthetic is reduced, the effect similar to the path | route which performs anesthesia using the chamber 7 can be acquired. In particular, the configuration using the anesthesia maintenance mask 8 is effective when long-term anesthesia is required, such as when operating a target body, because the amount of anesthetic used is small.

  The anesthetic maintenance mask 8 has a structure that can be detached from the anesthesia apparatus 20 in the same manner as the chamber 7. For this reason, the part which the target object touched can be wash | cleaned or disinfected easily, and it is excellent also in the sanitary surface.

  The activated carbon filter 11 is a member for collecting the mixed anesthetic gas 6, and activated carbon is used. As the activated carbon filter 11, a known filter can be used as long as the mixed anesthetic gas 6 can be collected as a filter. For example, instead of the activated carbon filter 11, a filter including a metal catalyst such as platinum can be used, and both filters can be used in combination.

  The suction pump 12 creates a gas flow in the anesthetic device 20, and a known suction pump can be used. The gas inside the anesthetic device 20 is collected by the suction pump 12 by the suction pump 12 and discharged to the outside. In the anesthesia apparatus 20, the output of the suction pump 12 is adjusted by a slider.

  Although not shown in the anesthesia apparatus 20, as an accompanying configuration, a sensor that controls the respiratory gas pump 1, etc., the flow meter valve 3, etc., and the anesthetic gas generator 5, etc., in order to control the amount of generation of a desired mixed anesthetic gas It is preferable that a control unit including a group and a microcomputer is provided. In the microcomputer, appropriate information for performing anesthesia is recorded according to the type of anesthetic and the type and number of objects. When the operator inputs information to the microcomputer and starts the operation of the anesthesia apparatus 20, each member of the anesthesia apparatus 20 automatically operates. In addition, when the setting of the flow meter valve and the concentration of the anesthetic gas become too high, a sensor that measures these values transmits a signal to the microcomputer, and a stop signal is transmitted from the microcomputer to each member. .

  Furthermore, it is preferable that a display unit for displaying an anesthesia start time of the anesthesia apparatus 20, an anesthetic gas generation status, and the like is provided. As the display portion, a light-weight thin-layer liquid crystal display device, an organic EL display device, or the like can be used. In addition, a case for accommodating a member constituting the anesthesia apparatus 20 may be provided.

The anesthesia apparatus 20 is a multistage simple inhalation anesthesia apparatus having a configuration including both a path for performing anesthesia using the chamber 7 and a path for performing anesthesia using the anesthetic maintenance mask 8. According to this structure, it is possible to perform anesthesia according to a multipurpose use.
Specifically, anesthesia can be introduced into the object through the path of the chamber 7, while the operator performs an operation or experiment on the object while performing maintenance anesthesia through the path of the mask 8 for maintaining anesthesia. be able to. Thus, since the work efficiency can be greatly improved, the present anesthesia apparatus is very useful.

  Here, in the case of adjusting the concentration of the anesthetic gas, when it is not necessary to mix air, the respiratory gas pump 1 and the flow meter valve 3 may not be provided. In this case, it is possible to provide a lighter anesthesia apparatus.

<Operation of anesthesia device>
Hereinafter, operation | movement of the anesthesia apparatus 20 which concerns on this Embodiment is demonstrated using FIG. In the figure, a solid line connecting the members indicates a path through which air flows, and a broken line indicates a path through which anesthetic gas flows. Moreover, the path | route which the continuous line and the broken line adjoin has shown the path | route through which the mixed anesthetic gas 6 with which the density | concentration of the anesthetic gas was reduced flows. The direction of the arrow indicates the direction in which the fluid flows.

  Before the anesthesia apparatus 20 is operated, the mouse M as the object is placed in the chamber 7 and the anesthesia maintenance mask 8. The position where the mouse M is placed on the anesthesia maintenance mask 8 is as shown in FIG.

  First, the operation | movement of the path | route which performs anesthesia using the chamber 7 in the upper stage of FIG. 1 is demonstrated. First, air is sent from the respiratory gas pump 1 and the anesthetic gas pump 2 to the flow meter valve 3 and the flow meter valve 4, respectively. This is because the gas flow is directed downstream by the suction pump 12 located downstream.

  The air whose flow rate is adjusted by the flow meter valve 3 is sent to the chamber 7. On the other hand, the air whose flow rate is adjusted by the flow meter valve 4 is sent to the anesthetic gas generator 5. In the anesthetic gas generator 5, the anesthetic is vaporized by the bubbling device, and anesthetic gas is generated. This anesthetic gas is sent to the chamber 7 side together with the air from the flow meter valve 4. This anesthetic gas is mixed with the air blown from the flow meter valve 3 to become a mixed anesthetic gas 6 and sent to the chamber 7.

  In this way, the anesthetic gas is mixed with the air from the flow meter valve 3, whereby the concentration of the anesthetic gas can be adjusted to a preferable concentration for the subject. An object is accommodated in the chamber 7, and anesthesia is performed by inhaling the introduced anesthetic gas. Whether or not anesthesia has been given may be confirmed visually by the operator.

  The mixed anesthetic gas 6 remaining in the chamber 7 moves to the activated carbon filter 11. In the anesthesia apparatus 20, the mixed anesthetic gas 6 is rendered as harmless as possible by the activated carbon filter 11, and then discharged to the atmosphere through the suction pump 12. For this reason, it can be said that it is the anesthesia apparatus which has reduced the load given to an environment extremely. Further, even in a closed laboratory where there is no exhaust facility such as a draft, the operator can operate the anesthesia apparatus without aspirating the anesthetic gas.

  Next, the operation | movement of the path | route which performs anesthesia using the mask 8 for anesthesia maintenance is demonstrated. The operation until air and anesthesia gas are mixed to prepare mixed anesthetic gas 6 is the same as that in the path of anesthesia using the chamber 7, but the generation of anesthesia gas is higher than in the case of using the chamber 7. The amount can be reduced. The mouse M, which is the object, is arranged as shown in FIG. 3, and whether or not anesthesia is performed is confirmed by the operator's visual observation.

  Thereafter, the operation of discharging the mixed anesthetic gas 6 remaining in the anesthesia maintaining mask 8 to the outside of the anesthesia apparatus 20 is the same as in the case of the route for performing anesthesia using the chamber 7.

  As a specific example using the anesthesia apparatus 20, a mouse M is integrally installed in the chamber 7, sevoflurane is used as an anesthetic, the flow rate of the flow meter valve 3 is 250 mL / min, and the flow rate of the flow meter valve 4 is 500 mL / min. By setting, the mixed anesthetic gas 6 was generated, and the induction anesthesia could be applied to the mouse M. Next, the mouse M subjected to induction anesthesia is placed on the anesthesia maintenance mask 8, sevoflurane is used as an anesthetic, and the flow rates of the flow meter valve 3a and the flow meter valve 4a are each set to 250 mL / min, The mixed anesthetic gas 6a was generated, and maintenance anesthesia for the mouse M could be performed for 30 minutes. During this time, the mouse M can be operated, and maintenance anesthesia can be continuously performed.

  Note that the time until the mouse M that has been anesthetized with the chamber 7 or the anesthesia maintenance mask 8 under the above conditions is greatly affected by the individual difference of the mouse M, but the mixed anesthetic gas 6 Or after about 5 minutes to 10 minutes have elapsed since the supply of the mixed anesthetic gas 6a was stopped.

  In FIG. 1, the anesthesia apparatus 20 of the present embodiment includes both a route using the chamber 7 and a route using the anesthesia maintenance mask 8, but is not necessarily limited thereto. It is also possible to have a configuration including only the path.

  In addition, this invention is not limited to said embodiment, A various change is possible within the scope of the present invention. For example, in the above embodiment, for convenience of explanation, in the anesthesia apparatus 20, the pump such as the respiratory gas pump 1, the chamber 7, and the anesthesia maintaining mask 8 are configured to have a minimum quantity. The present invention is not particularly limited to this, and the quantity can be increased or the arrangement can be changed as necessary.

  According to the simple inhalation anesthesia apparatus according to the present invention, an anesthetic gas having an appropriate concentration can be generated, and in particular, anesthesia can be safely performed on laboratory animals such as mice. For this reason, it can be used in the field of anesthesia devices and in the fields of experimental devices and medical devices using the same.

1 is an overall view showing an embodiment of a simple inhalation anesthesia apparatus according to the present invention. It is the schematic which shows the structure of the mask for anesthesia maintenance in the said simple inhalation anesthesia apparatus. It is the schematic which installed the mouse | mouth in the said mask for anesthesia maintenance.

Explanation of symbols

1, 1a Respiratory gas pump 2, 2a Anesthetic gas pump 3, 3a 4, 4a Flow meter valve 5, 5a Anesthetic gas generator (Bubbling device)
6, 6a Mixed anesthetic gas 7 Chamber 8 Anesthesia maintenance mask 9 Opening 10 Exhaust port 10a Inlet port 11 Activated carbon filter (filter)
12 Suction pump 20 Anesthesia device (Multi-stage simple inhalation anesthesia device)

Claims (6)

In a simple inhalation anesthesia apparatus comprising an anesthesia gas generator for generating anesthesia gas and a storage container in which a subject to be anesthetized by an anesthetic gas is accommodated,
A simple inhalation anesthesia apparatus, wherein the anesthesia gas generator includes a bubbling device that generates anesthesia gas by introducing bubbles into an anesthetic.   The simple inhalation anesthesia apparatus according to claim 1, further comprising a breathing gas pump for supplying a breathing gas to the anesthetic gas.   The simple inhalation anesthesia apparatus according to claim 1 or 2, wherein the container is an anesthesia maintenance mask having an opening into which a nose of a subject to receive anesthesia can be inserted.   The simple inhalation anesthesia apparatus according to any one of claims 1 to 3, wherein the lid provided in the storage container is a slide type.   The simple inhalation anesthesia apparatus according to any one of claims 1 to 4, further comprising a filter for collecting anesthetic gas introduced into the container.   The multistage simple inhalation anesthesia apparatus provided with two or more simple inhalation anesthesia apparatuses of any one of the said Claims 1-5.

Images