JPH0253062B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an anesthetic gas supply control device for controlling anesthetic gas supplied to a patient in an anesthesia machine to a desired amount.

(Prior Art) Conventionally, as an anesthesia machine, for example, as shown in FIG. At the same time, connect the anesthetic gas supply main body g to the intake path c.
It is known that a supply path h is connected to the anesthetic gas to constantly supply a constant amount of anesthetic gas. The anesthesia machine configured in this manner continuously supplies anesthetic gas from the anesthesia gas supply main body g to the intake path c via the supply path h, and at the same time supplies the continuously supplied anesthesia gas to the ventilator f. Therefore, it is forced to be supplied to the patient through the mask a by circulating it in an appropriate breathing cycle through the inhalation path c and the expiration path e.

(Problem to be Solved by the Invention) However, with the above configuration, the amount of anesthetic gas supplied to the mask a during the inhalation of the breathing cycle of the ventilator f is limited to the amount of anesthetic gas supplied to the intake path c by the ventilator f. The amount of gas to be delivered (for example, the breathing cycle of the ventilator f is 1:2, and the number of breaths is
When the insufflation amount per breath is set to 500 ml for 10 times, the time for one breath is 6 seconds, within which the inspiratory time is 2 seconds, and 500 ml of gas is delivered) from the anesthetic gas supply main unit g. The amount is the addition of the continuing gas amount (for example, when the supply rate is 6 per minute, 200 ml per 2 seconds). Therefore, in order to set the amount of gas to be supplied to the mask a to a desired amount, the amount of air delivered by the respirator f that can replenish the desired amount of gas must be calculated each time, and the amount of air to be supplied to the respirator f must be calculated in accordance with the calculation result. respirator f
It is necessary to set the amount of air to be blown, and the setting work is complicated, and there is a possibility that an unexpected accident may occur due to a miscalculation.

In addition, since the supply path h of the anesthetic gas supply main body g and the intake path c are in communication, pressure fluctuations in the intake path c caused by the intake cycle of the ventilator f are directly transmitted to the supply path h. Float-type monitors installed in the supply channel h to detect and set the amount of oxygen and laughing gas in the anesthetic gas are affected by the pressure fluctuations, making accurate detection and control impossible. There's a problem.

The present invention makes it possible to set the amount of air delivered to the inspiratory path without performing complicated calculations when setting the desired amount of gas to be supplied to the patient. It is an object of the present invention to provide an anesthetic gas supply control device for an anesthesia machine that does not cause any adverse effects.

(Means for Solving the Problems) The present invention provides a normally open one-way valve that is closed by inspiratory gas during inhalation, in a communication pipe that can be freely connected between an anesthetic gas supply path and an inspiratory path of an anesthesia machine. At the same time, a discharge path having a normally closed valve is connected to the anesthetic gas supply path side of the communication pipe, and the normally closed valve is opened by the intake gas flowing from the branch path communicating with the intake path side of the communication pipe. It is characterized by the following.

(Example) The present invention will be explained below with reference to the drawings.

1 and 2 show an embodiment of the present invention.

The illustrated anesthesia machine communicates between a mask 1 and a respirator 2 via an inhalation path 4 having an inhalation valve 3 and an exhalation path 6 having an exhalation valve 5. A supply path 8 that always supplies a constant amount of anesthetic gas from an anesthetic gas supply main body 7 was connected to the intake path 4 of the anesthetic gas. Then, while continuously supplying anesthetic gas from the anesthetic gas supply main body 7 to the inhalation path 4 via the supply path 8, the supplied anesthetic gas is transferred to the inhalation path 4 and the expiration path in a desired breathing cycle by the artificial respirator 2. 6
The mask 1 is configured to forcefully supply air to the patient by circulating air through the mask 1.

The above configuration is not particularly different from a conventional anesthesia machine.

The present invention is an anesthetic gas supply control device that can be attached to such an anesthesia machine to easily set the anesthetic gas supply amount to a desired amount.
In the communication pipe 9 that can be freely connected between the intake path 4 and the supply path 8, the inspiratory gas sent from the ventilator 2 to the intake path 4 during the inspiration of the breathing cycle of the ventilator 2, A normally open one-way valve 10 is provided to close the supply of anesthetic gas from the anesthetic gas supply main body 7 to the intake path 4.

Furthermore, a discharge path 11 is provided on the side of the anesthetic gas supply body 7 of the communication tube 9, which communicates with the communication tube 7 and whose end 11a is connected to the bag 12 of the respirator 2, and a normally closed valve 13 is provided in this discharge path 11. Furthermore, a branch passage 14 was provided on the intake passage 4 side of the communication pipe 9. and one way valve 1
0 is closed and intake gas flows into the branch passage 14, the intake gas inflates the expandable and deflated body 15 attached to the extreme end 14a of the branch passage 14, and the expansion and contraction body 15 expands. The normally closed valve 13 is opened in conjunction. In the illustrated example, the normally closed valve 13 and the expansion/contraction body 15 are housed in a housing 16 that is arranged in parallel with the communication pipe 9 .

In the drawing, reference numeral 17 indicates a filter filled with a carbon dioxide absorbent or the like placed in the intake passage 4, 18 a check valve provided in the discharge passage 11, 19 an oxygen supply source, and 20
is the source of laughing gas.

With the configuration as described above, during the inhalation of the breathing cycle of the ventilator 2, the one-way valve 10 in the communication pipe 9 is activated by the pressure of the inspiratory gas sent from the ventilator 2 to the intake path 4 as shown in the second diagram. is actuated to close the inside of the communication pipe 9, and at the same time, the intake gas is allowed to flow into the branch passage 14, and the expansion/contraction body 15 at the end 14a of the branch passage 14 is expanded to open the normally closed valve 13. As a result, the supply of anesthetic gas from the anesthetic gas supply main body 7 to the intake path 4 is cut off by closing the one-way valve 10, and is also released into the discharge path 11 via the housing 16.
Therefore, the amount of anesthetic gas supplied to the mask 1 during the inhalation of the breathing cycle of the ventilator 2 is
Since the amount of inspiratory gas delivered to the inspiratory path 4 is the same as the amount of inspiratory gas delivered to the inspiratory path 4, when setting the amount of gas to be supplied to the mask 1 to the desired amount, there is no need to perform complicated calculations each time as in the past. It is only necessary to set the air supply amount in step 2, and the setting work can be performed extremely easily and efficiently.

Furthermore, since the supply of anesthetic gas from the anesthetic gas supply main body 7 can be shut off by the one-way valve 10 during inhalation of the breathing cycle, the gas pressure is applied to the anesthetic gas supply main body 7 via the supply path 8 during the inhalation of the breathing cycle. Since fluctuations are not transmitted, float-type monitors, etc. that are installed near the anesthetic gas supply unit 7 to detect and set the amount of oxygen and laughing gas in the anesthetic gas can accurately detect them without being affected by pressure fluctuations. , settings can be made.

When the end 11a of the discharge path 11 is connected to the bag 12 of the ventilator 2 as shown in the illustrated example, the anesthetic gas from the anesthetic gas supply main body 7 can be supplied into the intake path 4 without wasting it.

(Effects of the Invention) As described above, according to the present invention, a normally open one-way valve that is closed by the intake gas during intake is provided in the communication pipe that can be freely connected between the anesthetic gas supply route and the intake route of the anesthesia machine. At the same time, a discharge path having a normally closed valve is connected to the anesthetic gas supply path side of the communication pipe, and the normally closed valve is opened by the intake gas flowing from the branch path communicating with the intake path side of the communication pipe. During the inhalation of the breathing cycle, the one-way valve installed in the communication pipe is closed to cut off the supply of anesthetic gas from the anesthetic gas supply path to the inspiratory path, and the normally closed valve is closed by the inspiratory gas flowing into the branch path. The anesthetic gas in the anesthetic gas supply path can be released through the release path by opening the valve.
Therefore, the amount of anesthetic gas supplied to the patient during inspiration in the breathing cycle is the same as the amount of inspiratory gas delivered to the inspiratory path, so when setting the desired amount of gas to be supplied to the patient, it is necessary to set the desired amount of gas to be supplied to the patient each time as before. Since the amount of air delivered to the inspiratory path can be set without performing complicated calculations, the setting work can be done extremely easily and efficiently. Since the supply of anesthetic gas can be cut off, the anesthetic gas supply path is not affected by pressure fluctuations during inhalation.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional views showing an embodiment of the present invention. FIG. 1 shows when anesthetic gas is being supplied from the anesthetic gas supply path, FIG. 2 is when anesthetic gas is being cut off,
FIG. 3 is a system diagram of a conventional example. 4...Intake path, 8...Supply path, 9...Communication pipe,
10... One-way valve, 11... Discharge path, 13... Normally closed valve, 14... Branch path.

Claims (1)

[Claims] 1. A normally open one-way valve that is closed by inspiratory gas during inhalation is provided in the communication pipe that can be freely connected between the anesthetic gas supply path and the intake path of the anesthesia machine, and a normally closed one-way valve is provided on the anesthetic gas supply path side of this communication pipe. Anesthetic gas supply for an anesthesia machine, characterized in that discharge passages each having a valve are connected, and the normally closed valve is opened by intake gas flowing in from a branch passage communicating with the intake passage side of a communication pipe. Control device.