JP2000185061A - Animal anesthetizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid hypercapnia and to rapidly supply oxygen in an emergency. SOLUTION: An anesthetic introducing carburetor 4, an anesthetic gas supply intake valve 5, and an anesthetic gas supply pipe 6 are arranged in sequence for an oxygen flow regulating valve 3 connected to an oxygen supply pipe, and an excess gas exhaust pipe 7 is branched from the anesthetic gas supply pipe 6 and an exhalation valve 8 is connected to the exhaust pipe 7. A resuscitator 10 is connected to the upstream side of the oxygen flow regulating valve via a valve 9 to constitute an animal anesthetizing device. Thus, since exhaust is discharged without circulation, hypercapnia is avoided and oxygen can be supplied from the resuscitator in an emergency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anesthesia apparatus for animals mainly used for anesthesia in experimental animals or animal hospitals.

[0002]

2. Description of the Related Art Conventionally, as this type of anesthesia apparatus, FIG.
The so-called semi-closed type shown in FIG. That is, in FIG. 2, an oxygen gas 52 for maintaining life and a laughing gas 51 for improving the effect of anesthesia and providing an analgesic effect are mixed to form a carrier gas. The gas containing an anesthetic is supplied to the animal by a technique of grasping the bag 55 at a constant rhythm or a mechanical technique. The exhaust from the animal is circulated in the circuit. Reference numeral 56 in FIG.
Is a pop valve, 58 is an exhalation valve, and 59 is an intake valve.

[0003]

In the conventional apparatus, since the laughing gas is mixed with the carrier gas, if the mixing ratio of the laughing gas is too high, there is a possibility that the oxygen is insufficient and the life is dangerous. is there. In addition, since laughing gas is expensive, it is also an economic burden. In addition, because of the semi-closed circuit configuration, the patient's expiration circulates through the circuit and is supplied again as inspiration. Therefore, if used for a long time, hypercapnia may occur, and carbon dioxide is removed using a canister containing a carbon dioxide absorbent. In addition, since the conventional device has a complicated circuit, it is difficult to downsize the device.

[0004]

According to the animal anesthesia apparatus of the present invention, an oxygen flow control valve connected to an oxygen supply pipe is provided with a vaporizer for introducing an anesthetic, an intake valve for supplying anesthetic gas, and an anesthetic gas supply pipe. Are sequentially arranged, and an exhaust pipe for surplus gas is branched from the anesthetic gas supply pipe, and this is connected to an exhalation valve. Furthermore, a resuscitator is connected to the upstream side of the oxygen flow control valve via a valve. According to a second aspect of the present invention, the microcomputer controls the oxygen flow control valve, the intake valve for supplying anesthetic gas, and the exhalation valve.

[0005]

In the present invention, oxygen is adjusted to a flow rate suitable for animal conditions by the action of the flow rate control valve and introduced into the vaporizer. In the vaporizer, a predetermined amount of an anesthetic is mixed with oxygen and vaporized, and is supplied to the animal intermittently at a constant rhythm by the function of an intake valve for supplying anesthetic gas. Then, the exhaust gas from the animal is discharged out of the circuit through an exhalation valve as surplus gas. In addition, if a resuscitation device is installed, the flow control valve, the intermittent valve, or the microcomputer should fail, and if a predetermined amount of gas is not supplied, the circuit to the resuscitation device should be opened to prevent oxygen from The animal's life is not jeopardized. Further, in the invention of claim 2, since the valve is controlled by the microcomputer, if the weight of the animal is input, the oxygen flow rate and the like are automatically set, and standard anesthesia is performed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, a pressure reducing valve 2 and a flow control valve 3 composed of a plurality of solenoid valves are connected to an oxygen cylinder 1, and a vaporizer 4 is connected downstream of the flow control valve 3. I have. An anesthetic gas supply pipe 6 is connected to the downstream side of the vaporizer 4 via an intake valve 5. An exhaust pipe 7 branches off at the end of the supply pipe 6, and an exhalation valve 8 is connected to the exhaust pipe 7. On the other hand, a resuscitator 10 is connected between the pressure reducing valve 2 and the flow regulating valve 3 via a cock valve 9.

The flow regulating valve 3 is constituted by a plurality of solenoid valves having different flow rates. By selecting a combination of solenoid valves to be opened, the amount of oxygen introduced into the vaporizer can be adjusted in multiple stages. It is. The intake valve 5 and the exhalation valve 8 are arranged such that when the intake valve 5 is opened, the exhalation valve 8 is closed, and when the exhalation valve 8 is opened, the intake valve 5 is closed. The opening and closing of the support the ventilation to the patient. Exhaled gas is discharged from the exhalation valve 8 as extra gas to the outside of the circuit, and does not circulate.

The microcomputer 3 controls the flow control valve 3, the intake valve 5, and the exhalation valve 8. That is, a program for calculating ventilation conditions necessary for anesthesia, such as the flow rate of oxygen per minute, the number of breaths, the maximum inspiratory pressure, and the like, is recorded in the microcomputer 11, and the standard weight is obtained by inputting the weight of the animal. It is possible to set various ventilation conditions. Then, the amount of oxygen passing through the flow control valve 3, the opening / closing pitch of the intake valve 5 and the exhalation valve 8, and the time are controlled according to the calculated ventilation conditions.

[0009] A pressure sensor is disposed in the supply pipe, and the pressure sensor measures the airway pressure.
The intake time until the maximum intake pressure determined in the initial setting is reached is calculated and input to the microcomputer 11. The microcomputer 11 calculates and outputs a respiratory minute per minute and a tidal volume per 1 kg of body weight based on the inhalation time, and displays on the monitor 12 a ventilation status, a device failure status, and the like. I have. In the event that an electrical or mechanical failure occurs and there is a danger that the life of the patient will be threatened, the alarm 13 sounds. In the figure, reference numeral 15 denotes a battery.

The operation of the apparatus of the above embodiment is as follows. First, the distal end of the supply pipe 6 is closed with a finger, the power switch 14 is turned on, and pressure is applied to the circuit to check for gas leakage. The check result is displayed on the monitor 12.
After confirming that the patient is normal, the patient's weight is input to the microcomputer 11, standard anesthesia conditions are set according to the calculation formula recorded in the microcomputer, and displayed on the monitor 12. The setting can be changed to any ventilation condition. After an appropriate set value is obtained, the distal end of the supply pipe 6 is held by the patient, and when an operation switch (not shown) is turned on, oxygen flows out of the oxygen cylinder 1, passes through the pressure reducing valve 2, the flow control valve 3, and the vaporizer. It is sent to 4. At this time, the pressure reducing valve 2 and the flow regulating valve 3 are controlled by the microcomputer 11, and an appropriate amount of oxygen is supplied to the vaporizer 4.

In the vaporizer 4, the anesthetic is vaporized and mixed with oxygen (generally adjusted in the range of 0.5% to 5.0% (weight ratio)). Oxygen mixed with anesthetic is
It is intermittently supplied to the patient from the supply pipe 6 according to the opening and closing of the intake valve 5. Then, the exhalation of the patient is discharged as extra gas out of the circuit when the exhalation valve 8 is opened via the exhaust pipe 7. The microcomputer 11 controls the pitch and time for opening and closing the intake valve 5 and the exhalation valve 8 in the above.

The intake valve 5 and the exhalation valve 8 described above can be operated by sensing the patient's own breathing in the assisted breathing mode. That is, in the assisted breathing mode, the patient's own breathing is sensed by the negative pressure generated at the start of the patient's own breathing, and the signal is input to the microcomputer to open and close the inhalation valve 5 and the exhalation valve 8. If the absolute value (assist value) of the negative pressure for detecting that there is self-breathing is set small, spontaneous breathing is detected even if a slight negative pressure is present, so that ventilation with priority on self-breathing is performed. Such ventilation with priority on self-breathing is particularly useful for anesthesia for animals that dislike active-ventilation, and for artificial respiration during anesthesia. Conversely, when the patient's own breathing is weak or mechanical breathing is performed, the inspiratory valve 5 and the exhalation valve 8 are set so that the assist value is increased or the assist breathing mode is turned off to perform mechanical controlled breathing. The microcomputer 11 is programmed to operate.

When a failure occurs in the microcomputer 11 or a valve or the like, the fact is displayed on the monitor 12 and an alarm 13 sounds. Then, the cock valve 9 is operated to guide oxygen from the oxygen cylinder 1 to the resuscitator 10. At the same time, if the distal end of the supply pipe 6 is removed from the mouth of the patient and the air supply pipe of the resuscitator 10 is held in the mouth of the patient, oxygen is supplied to the patient, so that life-threatening is avoided.

[0014]

According to the present invention, the following effects can be obtained. 1. Since the patient's exhalation is a non-rebreathing circuit that exhausts as excess gas, fresh gas is always supplied to the patient. Therefore, there is no danger of hypercapnia, the amount of anesthetic does not fluctuate, the circuit is simplified, and the device can be miniaturized. 2. 2. Since only oxygen is used without using laughing gas unlike the conventional one, there is no danger of oxygen shortage due to an excessive mixing ratio of laughing gas, and the cost can be reduced. Since the resuscitation device was connected, if an electrical or mechanical failure occurred in the circuit and the appropriate amount of oxygen was not supplied to the patient, the resuscitation device could be operated only by operating the valve, and the patient Can be supplied with oxygen. At this time,
Since the same oxygen cylinder as that used for anesthesia can be shared, it is simple and space-saving.
According to the second aspect of the invention, since the control is performed by the microcomputer, the setting of various conditions can be entrusted to the computer, so that the operation is very simple and erroneous setting is prevented.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is a circuit diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oxygen cylinder 2 Pressure reducing valve 3 Flow control valve 4 Vaporizer 5 Intake valve 6 Supply pipe 7 Exhaust pipe 8 Expiration valve 9 Cock valve 10 Resuscitator 11 Microcomputer 12 Monitor 13 Alarm 14 Power switch

Claims (2)

[Claims] 1. An anesthetic introduction vaporizer, an anesthetic gas supply intake valve, and an anesthetic gas supply pipe are sequentially disposed on an oxygen flow control valve connected to an oxygen supply pipe, and an excess gas is supplied from the anesthetic gas supply pipe. An anesthesia device for animals, in which an exhaust pipe is branched, an exhalation valve is connected to the exhaust pipe, and a resuscitator is connected via a valve upstream of the oxygen flow control valve. 2. The animal anesthesia apparatus according to claim 1, wherein the oxygen flow control valve, the anesthetic gas supply intake valve and the exhalation valve are controlled by a microcomputer.