JPS61179161A - Humidifier for anesthetic device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a humidifying device for an anesthesia machine. Adding humidity to the gas inhaled during anesthesia is good (and used) for dental anesthesia (called laughing gas inhalation sedation).For dental anesthesia, the gas is inhaled through a nasal mask, but Since a mixture of dry oxygen and laughing gas makes the nose dry and uncomfortable, a method of humidifying the gas by passing it through water is used.To pass the gas through water, put it in a container filled with water. A pipe with a filter attached to the bottom end is inserted and gas is passed through the water, creating air bubbles that humidify the water.When doctors use the device on a daily basis, they only remove the water container, so they can clean the container.

However, the pipes and filters are fixed to the anesthesia machine body and cannot be easily removed, so they are not cleaned or sterilized.

However, there is always moisture, and the water used is not necessarily distilled water, so there are concerns that it may become unsanitary.

The present invention provides a humidifier having a humidifying unit that is easy to install and remove so that it can be easily cleaned and sterilized and kept clean at all times. Another purpose is to prevent water inside the humidifier from flowing back into the anesthesia machine. When the anesthesia machine is in use, the gas passes through the humidifier, so water does not flow back, but after use, the gas flow stops and the pressure in the circuit inside the anesthesia machine decreases due to the temperature difference between day and night, causing atmospheric pressure to drop. may push water back into the humidifier, causing water to enter the internal circuit.

Conventional humidifiers use a simple backflow valve, so they cannot prevent low pressure from penetrating over a long period of time.

Therefore, the present invention prevents the backflow of water by providing a bypass that short-circuits the pressure to the inside of the anesthesia machine without applying pressure to the water surface inside the humidifier, and will be explained below with reference to the drawings.

FIG. 1 is a diagram illustrating the installation location of a humidifier in the circuit of an anesthesia machine. In FIG. 1, the flow rate of oxygen supplied at a predetermined pressure is determined by an oxygen flow rate regulating valve 1, passes through an oxygen flow meter 6, and reaches an inflow manifold 7a. Similarly, the flow rate of laughing gas is determined by the laughing gas flow rate regulating valve 2, and the laughing gas flows through the laughing gas flowmeter 4 and is mixed with oxygen in the inflow manifold 7a. Flow rate adjustment valve 1.
2 is a normal needle valve, and the flow rate can be adjusted by moving the needle in and out. The flow meter 6.4 is normally constructed with a tapered tube and a float, and the flow rate regulating valve 1.2 is operated to set the desired flow rate while measuring the instantaneous flow rate value (RI1) with the flow meter 6.4. Moisture is added to the gas mixed in the inflow manifold 7a as it passes through the humidifier 5, temporarily stored in the reserve bag 6, and flows out from the outflow manifold 7b in response to the patient's breathing.

FIG. 2 is a sectional view of main parts showing the structure of a conventional humidifying device, which has an inflow manifold 7a and an inflow manifold 7b, and an inflow pipe 12 is fixed to a manifold block 7, which is a part of the anesthesia machine body, with a lid 11 in between. An inflow path 8 is formed.

A pipe 16 is also fixed to the manifold block 7 with the lid 11 in between, forming an outflow path 9. The respective threaded portions 12a and 13a of both pipes are designed to maintain airtightness (by applying a sealant and screwing them in, etc.). A filter 12b is located at the bottom of the inflow pipe 12 and has a large number of small holes. pipe 1
Reference numeral 6 has a valve seat 13c on which a valve ball 14 is placed, and is provided with a member (not shown) to prevent the valve ball 14 from coming out into the outflow manifold 7b.

When gas flows from the inflow path 8 through the filter 12b and the water 15 to the outflow path 9, the valve ball 14 floats up from the valve seat 13c,
Conversely, when the pressure in the outflow path 9 is higher than the pressure in the inflow path 8, the valve ball 14 is pressed against the valve seat 13c to cut off the gas pressure. However, when the pressure difference between the outflow path 9 and the inflow path 8 is low, the valve does not function sufficiently, and if low pressure is applied for a long time, the water 15 may flow back from the inflow path 8 to the inside of the anesthesia machine via the inflow manifold 7a. .

In addition, in the humidifying device shown in Fig. 2, only the humidifying water container 10 screwed into the lid 11 can be attached and detached frequently in daily life, and the inside of the lid 11, the pipe 12, the filter 12b, etc. cannot be removed, so the humidification is carried out. The equipment was rarely cleaned.

FIG. 3 is a sectional view of a main part of a humidifying device showing a first embodiment of the present invention. The humidifying unit that can be separated from the manifold block 7, which is a part of the anesthesia machine body, includes a mounting plotter 20, a lid 11, an inflow pipe 22, a filter 12b, and a pipe 2.
6 and a humidifying water container 10. To explain the function of each element in FIG. 3, the lid 11 is fixed to the mounting block 20 by an inflow pipe 22 and threaded portions 22a, 23a of the pipe 26. Mounting block 20 has mounting screws 2
1 can be connected to and separated from the manifold blower 7, and can be separated as a humidifying unit to perform cleaning, sterilization, etc. of the inflow pipe 22, filter 12b, inside of the lid 11, etc.

The gas circuit is connected to the inflow pipe 22 and pipe 26 to the O IJ songs 6 and 27 arranged in the manifold block 7.
The ends (cylindrical parts that are not screws) 22d and 23d fit together to maintain airtightness between the humidifying unit and the manifold block 7.

A thin pipe 24 connecting the inlet passage 8 and the outlet passage 9 is provided inside the manifold block 7. The function of the pipe 24 is that when the pressure in the outflow path 9 becomes higher than the pressure in the inflow path 8 when the anesthesia machine is not in use, the pressure difference is released inside the anesthesia machine, and water 15 flows into the anesthesia machine from the inflow manifold 7a. Prevent backflow into the container. Anesthesia gas flows from inflow channel 8 to water 1
5, the pipe 24 directly passes a small amount of gas to the outflow path 9, but since the pipe 24 is very thin compared to the main flow path, most of the gas passes through the water. Therefore, there is no problem at all in terms of gas humidification. Inflow channel 8
The bypass 25 between the and outflow passage 9 is as thin as possible (a long hole is desirable, but a thin elongated hole is difficult to machine).

In order to solve the difficulty of machining small holes, the present invention creates a hole with a diameter of about 1 inch in the partition wall, and creates a pipe 24 that is longer than the thickness of the partition wall.
is inserted to obtain a bypass 25 with an inner diameter of about 0.5 mm and a length of about 20 mm. Incidentally, it is known that the volumetric flow rate of a fluid flowing through a narrow pipe is proportional to the pressure difference between the inlet and outlet of the pipe and the fourth power of the radius of the pipe, and is inversely proportional to the viscosity of the fluid passing through it and the length of the pipe. Another possible method for mounting the humidifying unit on the manifold block 7 is to provide a hook on the mounting block 20.

FIG. 4 shows a second embodiment of the present invention, in which the manifold block 7 and the humidifying unit are connected by a bayonet system, and the pressure of the manifold 7b is released by an IJ valve. In Figure 4, manifold block 7
Bayonet portions 7d and 11a are provided for directly connecting the lid 11 and the lid 11, and the connecting portions of the inflow path 8 and the outflow path 9 are kept airtight by 01J rings 60 and 61, respectively. As a means for releasing the pressure difference when the pressure in the outflow path 9 is higher than the pressure in the inflow path 8, a relief valve mechanism consisting of a bypass 25, a valve ball 14, and a valve seat portion 7e of the manifold block is provided. There is. Normally, when gas is flowing from the inflow path 8 through water, the valve ball 14 is pressed against the valve seat 7e due to the pressure difference between the inflow path 8 and the outflow path 9, and the circuit of the bypass 25 is closed. Conversely, when the pressure in the outflow path 9 increases, the valve ball 14 floats up from the valve seat 7e and releases the differential pressure to the inflow path 8 through the bypass 25, so that the water surface is not pushed down. The stopper 66 is for enclosing the valve ball 14 and is kept airtight by an O-ring 64.

FIG. 5 also shows the third embodiment of the present invention, and the means for separably fixing the humidifying unit to the manifold block 7 is to screw the threaded part 11b at the center of the lid into the manifold block 7, and the gas circuit is connected to the lid 11. Circular groove 40 provided
The gas is guided from the outflow passage 8 to the outflow manifold 7b through the outflow path 8. In FIG. 5, a pipe 24 is provided in the lid 11 and short-circuits the inflow path 8 and the outflow path 9. 0 rings 41 and 42 are grooves 40
This is the airtight sealing mechanism for manifold block 7.

As explained above, the present invention provides the lid 11 of the humidifying water container 10, the pipe 12, etc. to facilitate cleaning and sterilization of the humidifier.
22. Instead of fixing the filter 12b directly to the manifold block 7 of the anesthesia machine body, it is installed on the side of the detachable humidifying unit so that the humidifying unit can be easily removed, allowing sterilization that could not be performed with conventional humidifying devices. etc. can be processed.

In addition, in order to prevent the water from the humidifier from flowing back into the anesthesia machine, there is a bypass 2 that does not pass through water in the middle of the gas flow path.
5, the circuit is constructed with a relief valve or a thin pipe, etc., and when the pressure in the outflow path 9 becomes higher than the pressure in the inflow path 8, the pressure difference is balanced through the bypass 25 to prevent water from flowing back inside the humidifier. Therefore, it is a hygienic and trouble-free humidifier for anesthesia machines.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the installation location of the humidifier in the circuit of the anesthesia machine. FIG. 2 is a sectional view of a main part explaining the structure of a conventional humidifying device for an anesthesia machine. FIG. 3 is a sectional view of essential parts showing the first embodiment of the humidifying device of the present invention. FIG. 4 is a sectional view of a main part showing a second embodiment of the present invention. FIG. 5 is a sectional view of a main part showing a third embodiment of the present invention. 7... Manifold block, 7d...
・Bayonet part of manifold block, 8...
- Inflow channel, 9... Outflow channel, 10... Humidifying water container, 11... Lid, 11a... Bayonet part of the lid, 11b... ...screw part of the lid, 14
...Valve ball, 20...Mounting block, 2
2...Inflow eve, 24-...Pipe,
25... Bypass. Figure 2

Claims (7)

[Claims] (1) A manifold block equipped with a gas inflow path and an outflow path, a humidifying water container, and an inflow pipe that holds the humidifying water container and opens below the water surface in the humidifying water container and connects to the inflow path are fixed. A humidifying device for an anesthesia machine, comprising: a lid having an outflow path that guides humidified gas to the outflow path; and a bypass that communicates the inflow path and the outflow path. (2) a humidification unit consisting of a humidification water container and a lid that holds the humidification water container and has an outflow path that fixes an inflow pipe that opens below the water surface in the humidification water container and allows the humidified gas to flow out; A humidifying device for an anesthesia machine, characterized in that a manifold block is separably connected to the humidifying unit, the manifold block having an inflow path connected to an inflow pipe of the humidification unit and an outflow path connected to an outflow path of the humidification unit. (3) The humidifying device for an anesthesia machine according to claim 1, wherein the bypass is a pipe inserted into the partition wall. (4) The bypass closes when the pressure in the inflow path is higher than the pressure in the outflow path, and opens when the pressure in the inflow path is lower than the pressure in the outflow path, releasing the pressure in the outflow path to the inflow path. The humidifying device for an anesthesia machine according to claim 1, characterized in that the humidifying device is equipped with a relief valve that provides a relief valve. (5) The means for separably fixing the humidifying unit to the manifold block includes a mounting block to which a lid for holding a humidifying water container is fixed.
A humidifying device for an anesthesia machine as described in Section 1. (6) The means for separably fixing the humidifying unit to the manifold block is characterized in that the lid for holding the humidifying water container is provided with a bayonet part that engages with the manifold block. Humidifier for anesthesia machine. (7) The means for separably fixing the humidifying unit to the manifold block is characterized in that the lid holding the humidifying water container is provided with a screw portion that engages with the manifold block. Humidifier for anesthesia machine.