JPH0654797A - Gas applicator - Google Patents

Abstract

PURPOSE:To provide a gas applicator which enables the prevention of possible internal contamination. CONSTITUTION:A gas applicator which has a main body 10 to supply a gas in a cylinder 2 into an abdominal cavity 3 of a human body or an animal while maintaining the pressure in the abdominal cavity 3 at a specified value by adjusting the supply of the gas and an exhaust means 40 to discharge the gas in the abdominal cavity 3 outside is provided with a bypass pipe 30 as reversion preventing means to prevent the reversion of the gas from the abdominal cavity 3 when the supply of the gas is stopped. Even in the use of an apparatus such as laser scalpel or coagulator, where a gas other than the gas supplied from the gas applicator 1 is supplied into the abdominal cavity 3 and a rise in the air pressure in the abdominal cavity 3 leads the main body to stop the supply of the gas, the reversion preventing means acts to prevent the gas in the abdominal cavity 3 from flowing to the side of the main body 10. This eliminates the infiltration of pathogens even in the operation of a patient with an infectious disease thereby preventing contamination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas ventilator, which can be used for endoscopic examination or operation of the abdominal cavity of a human body or an animal.

[0002]

2. Description of the Related Art In recent years, surgery is being performed by observing the inside of the abdominal cavity with an endoscope. In such a surgery, an inert gas such as carbon dioxide (CO ₂ ) gas is supplied into the abdominal cavity to inflate the abdomen, and in this state, a pipe-shaped ventilator is pierced into the abdomen, and forceps or a scalpel that can be operated externally are used. Etc. are inserted into the above-mentioned ventilator. According to such an operation, the abdomen is not greatly incised, and the incision wound due to the operation is extremely small, so that there are advantages such as quick recovery after the operation.

In such an operation, a gas vent device is used to inflate the abdomen. The gas ventilation device adjusts the gas pressure in the abdominal cavity while supplying gas such as a cylinder, which is a gas supply source, into the abdominal cavity.

On the other hand, instruments such as a laser scalpel and a plasma coagulator that enable accurate and quick surgery are used for surgery. When using the laser knife, it is necessary to cool the tip portion with argon (Ar) gas or the like, and the plasma coagulation device coagulates blood with plasma generated in Ar gas.

[0005]

However, when a device such as a laser scalpel or a coagulating device is used, a gas different from the gas supplied by the gas ventilation device is supplied to the abdominal cavity, so that the gas ventilation device supplies gas. Even if is stopped, the gas pressure in the abdominal cavity rises and the gas in the abdominal cavity may flow into the gas-air device. Here, when cutting the tissue in the abdominal cavity with a laser scalpel, etc., pathogens such as viruses and pathogens scatter in the abdominal cavity, and these pathogens enter the gas ventilation device together with the gas flowing out from the abdominal cavity, so that the conventional gas The ventilation device has a problem that the inside of the ventilation device is contaminated by the surgery of the patient with an infectious disease.

On the other hand, there is a device which is provided with a relief valve for releasing the gas pressure in the abdominal cavity to the outside to maintain the gas pressure in the abdominal cavity at a predetermined value. However, even in such a gas ventilation device, the inside is communicated with the abdominal cavity, and when the gas supply is stopped, the internal gas pressure fluctuates following changes in the gas pressure inside the abdominal cavity. Due to the delay of this pressure fluctuation, gas in the abdominal cavity may flow into the gas ventilation device side, so that internal contamination cannot be prevented.

An object of the present invention is to provide a gas venting device in which internal contamination can be prevented.

[0008]

The present invention provides a body for supplying gas from a gas supply source into the abdominal cavity of a human body or an animal and adjusting the amount of gas supply to maintain a predetermined pressure in the abdominal cavity. A gas venting device having an exhaust means for exhausting the gas in the abdominal cavity to the outside, comprising a backflow preventing means for preventing backflow of gas from the abdominal cavity to the main body when the supply of gas is stopped. To do.

Here, the backflow preventing means is provided in a gas line that bypasses at least a part of the main body and has a throttle in the middle, or is provided in the gas line between the gas ventilator and the abdominal cavity. A solenoid valve or the like that is closed by stopping the gas supply of the gas ventilation device can be adopted.

As the exhaust means, a flexible tube connected to the abdominal cavity and serving as a gas discharge path, and an operation of being attached to the tube and crushing an intermediate part thereof to stop the flow of gas A device having a container can be adopted.

[0011]

In the present invention as described above, the gas ventilation device
Gas is supplied into the abdominal cavity to inflate the abdomen so that surgery can be performed on the abdomen. And with the start of surgery,
The operation of instruments such as a laser scalpel and a coagulation device is started, and by supplying a gas different from the gas supplied by the gas ventilation device,
The gas pressure in the abdominal cavity rises. In response to this increase in gas pressure, the gas ventilation device stops the supply of gas and then opens the exhaust means to maintain the gas pressure at a predetermined pressure value.

At this time, even if the supply of the gas is stopped, the gas in the abdominal cavity is prevented from flowing into the gas ventilation device side by the backflow preventing means, and the gas is scattered into the abdominal cavity by using a laser knife or the like. Pathogens will not enter the gas venting device, thereby achieving the above objective.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a gas ventilation device 1 of this embodiment. The gas ventilation device 1 includes a cylinder 2 which is a gas supply source.
It has a main body 10 for adjusting the gas pressure in the abdominal cavity 3 while supplying the gas in the abdominal cavity 3 and a control device 20 for controlling the main body 10.

On the upstream side of the main body 10, there are cylinder pressure gauges 11, 1
A secondary pressure reducing valve 12 and a secondary pressure reducing valve 13 are provided. The cylinder pressure gauge 11 measures the pressure of the gas discharged from the cylinder 2. The primary pressure reducing valve 12 reduces the high pressure gas in the cylinder 2 to a predetermined intermediate pressure value. Secondary pressure reducing valve
13 is for finally depressurizing the gas depressurized to the intermediate pressure value to a predetermined pressure value.

A solenoid valve for control is provided downstream of the secondary pressure reducing valve 13.
14, flow sensor 15, flow control valve 16, and pressure sensor
17 are provided.

The control solenoid valve 14 is opened / closed by a command from the control device 20 according to the gas pressure in the abdominal cavity 3. The gas pressure in the abdominal cavity 3 is adjusted by opening and closing the control solenoid valve 14. The flow rate sensor 15 detects the flow rate of the gas supplied to the abdominal cavity 3, and outputs the flow rate value detected by the flow rate sensor 15 to the control device 20. The flow rate control valve 16 is opened and closed by a command from the control device 20 so that the flow rate of the gas supplied to the abdominal cavity 3 is maintained at a predetermined amount. The pressure sensor 17 detects the gas pressure in the abdominal cavity 3 when the control solenoid valve 14 is closed, and outputs the detected pressure value to the control means 20. The control means 20 that has received the pressure value opens and closes the control solenoid valve 14 according to the pressure value.

A bypass pipe 30 connects the upstream portion of the control solenoid valve 14 and the downstream portion of the flow control valve 16. The bypass pipe 30 is configured to allow a minute flow rate of gas to pass by a throttle valve 31 provided in the middle. This bypass pipe 30
Therefore, when the gas supply to the main body 10 is stopped, the abdominal cavity 3
A backflow preventing means is configured to prevent the gas therein from flowing into the main body 10 side.

An exhaust means 40 for exhausting the gas in the abdominal cavity 3 to the outside is connected in the middle of the gas line 18 connecting the main body 10 and the abdominal cavity 3. The gas line 18 is a flexible tubular member made of silicon rubber or the like. The exhaust means 40 includes a three-way joint 41 for branching the gas line 18, an exhaust passage 42 made of a tubular member made of the same material as the gas line 18, and the exhaust passage 42.
And an electromagnetic operating device 43 for crushing and closing the middle part of the.

The three-way joint 41 is, as shown in FIG. 2, provided with a throttle portion 41B inside a branch portion 41A to which the exhaust passage 42 is connected. The electromagnetic operation device 43 includes an insertion portion 44 through which the exhaust passage 42 is inserted, a plunger 45 that advances and retracts toward the insertion portion 44, a solenoid 46 that drives the plunger 45, and the like. Of these, the plunger 45 is
A coil spring 47 provided inside the solenoid 46 is constantly biased toward the insertion portion 44 side.

When the solenoid 46 is not energized, the plunger biased by the coil spring 47 is used.
The exhaust passage 42 is closed by being crushed by 45. On the other hand, when the solenoid 46 is energized, the attraction force of the solenoid 46 causes the plunger 45 to retreat against the biasing force of the coil spring 47, whereby the exhaust passage 42 is opened.

At the right end of the insertion portion 44 in the figure, a photo sensor 48 as a detecting means is provided. Photo sensor 48
Is an optical proximity switch or the like, and detects the exhaust passage 42 when the exhaust passage 42 is installed in the insertion passage 44 in a desired state. If the exhaust path 42 cannot be detected,
An abnormal signal is sent from the photo sensor 48 to the control device 20 when there is a confirmation signal from the control device 20.

Next, the operation of this embodiment will be described.
First, the gas ventilator 1 is prepared by connecting the cylinder 2, the exhaust means 40 and the like to the main body 10 of the gas ventilator 1 in advance. After the preparation is completed, the power supply is turned on to activate the gas ventilating device 1 to bring the abdominal cavity 3 to a predetermined gas pressure so that the operation can be started. At this time, if the exhaust passage 42 is not correctly installed in the electromagnetic operation device 43, the gas ventilation device 1 does not operate even when the power is turned on, so the exhaust passage 42 is installed in the correct position.

When the operation is started, the control device 20 controls the control solenoid valve 14 so that the gas pressure in the abdominal cavity 3 becomes a predetermined value.
And controlling the electromagnetic operation device 43 and the like. Here, when the laser knife or the like is not used, the gas pressure inside the abdominal cavity 3 is controlled by opening and closing the control solenoid valve 14 to supply gas so as to supplement the amount of gas that escapes from the abdominal cavity 3. Maintain a predetermined value.

On the other hand, when a laser scalpel or the like is used, gas is supplied separately from the gas ventilator 1, so that the gas pressure in the abdominal cavity 3 rises even if the control solenoid valve 14 is closed. Will end up. Therefore, the control means 20 is a solenoid valve for control.
When the pressure of the gas in the abdominal cavity 3 is increased when the pressure sensor 17 is closed
When it is detected by, the exhaust means 40 is opened to exhaust the gas in the abdominal cavity 3 to the outside, thereby maintaining the gas pressure in the abdominal cavity 3 at a predetermined value.

At this time, even if the control solenoid valve 14 is closed,
The bypass pipe 30 allows the gas to constantly flow out from the main body 10 to the abdominal cavity 3 side. Therefore, the gas in the abdominal cavity 3 is discharged to the outside without entering the inside of the main body 10,
Invasion of pathogens inside is prevented.

According to this embodiment, the following effects can be obtained. That is, the abdominal cavity 3 from the main body 10 by the bypass pipe 30
Since the gas always flows out to the side, even if the gas supply of the gas ventilation device 1 is stopped, the pathogens etc. in the abdominal cavity 3 are
It is possible to prevent the body 10 of the gas ventilation device 1 from being contaminated by the operation of a patient with an infectious disease because it does not enter the inside of the device 10.

Further, since the bypass pipe 30 having a simple structure is adopted as the backflow preventing means, the backflow preventing effect is always activated without any failure. Therefore, the control device
Even when the control valve 20 or the control solenoid valve 14 fails, the gas ventilation device 1 can be prevented from being contaminated.

Further, a throttle valve 31 is provided on the bypass pipe 30,
Since a minute flow of gas is made to flow, the control solenoid valve 14
The pressure sensor 17 can detect an accurate pressure value without affecting the pressure measurement of the pressure sensor 17 at the time of closing.

Further, since the electromagnetic operating device 43 and the exhaust passage 42 are separately provided and the exhaust passage 42 is inserted through the electromagnetic operating device 43, the electromagnetic operating device 43 and the exhaust passage 42 are inserted into the electromagnetic operating device 43 during the surgery. In addition to preventing contamination of the manual operation device 43, the contaminated air passage 42 can be easily pulled out from the electromagnetic operation device 43 and sterilized or incinerated.

Further, a photo sensor 48 is attached to the electromagnetic actuator 43.
Since it is possible to detect that the exhaust passage 42 is correctly installed in the electromagnetic operation device 43, it is possible to eliminate malfunction due to incorrect installation, and to ensure exhaust operation during surgery. can do.

It should be noted that the present invention is not limited to the above-mentioned one embodiment, but includes the following modifications and the like. That is, the exhaust means is not limited to one connected in the middle of the gas line 18, and may be, for example, one directly connected to the abdominal cavity 3.

A bypass pipe is used as the backflow prevention means.
Not limited to passive devices such as 30, for example, pressure sensors
A solenoid valve installed on the downstream side of 17 or an active valve such as a flow control valve 16 forcing a small opening to flow a minute flow may be used. In short, gas in the abdominal cavity 3 may be used. In order to prevent the inflow of the gas, it is possible to employ one that constantly purges the gas or one that blocks the gas outlet of the main body 10. According to the above-mentioned embodiment, even if the control device 20 or the flow control valve 16 is out of order, the gas ventilation device 1 can be prevented from being contaminated.

When the backflow prevention means is a solenoid valve,
Similar to the exhaust means 40, it is desirable to adopt a flexible tube that crushes the middle of the tube to close the gas passage. In this case, it is preferable to employ one that closes both the passage of the backflow preventing means and the exhaust passage 42 at both ends of one plunger so as to also serve as the electromagnetic operating device 43 of the exhaust means 40.

Further, the bypass pipe 30 is not limited to one in which one end on the upstream side is connected to the downstream side of the secondary pressure reducing valve 13,
For example, it may be connected immediately after the cylinder 2. In this case, it is desirable to reduce the throttle of the throttle valve 31 and increase the flow path resistance.

The pressure control method of the control means 20 is not limited to the control method of detecting the gas pressure in the abdominal cavity 3 when the control solenoid valve 14 is closed as shown in the above-mentioned embodiment.
A method of directly detecting and controlling the pressure in the abdominal cavity 3 may be used, and a specific control method may be appropriately selected for implementation.

Further, as the detection means of the exhaust means 40,
Not limited to the photo sensor 48, for example, a contact type limit switch or the like may be used. Further, the abnormality detecting method by the detecting means is not limited to the method of responding to the confirmation signal of the control device 20 or the like, and the detecting means is provided with a contact which is closed when an abnormality occurs, and the contact is kept closed until a reset operation is performed. In this state, regardless of whether there is a request from the main body 10 or the control device 20 side, a method of always outputting an abnormal signal, or if there is an abnormality at the time of starting the gas ventilation device 1, A method of outputting an abnormal signal at a timing can be adopted.

[0037]

As described above, according to the present invention, the gas in the abdominal cavity does not flow into the side of the gas ventilation device by the backflow preventing means. It can prevent pollution.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing an exhaust means of the embodiment.

[Explanation of symbols]

 1 Gas ventilation device 3 Peritoneal cavity 30 Bypass pipe as a means for preventing backflow 40 Evacuation means

Claims (4)

[Claims] 1. A main body for supplying a gas from a gas supply source into the abdominal cavity of a human body or an animal and controlling the gas supply amount to maintain a predetermined pressure in the abdominal cavity, and the gas in the abdominal cavity to the outside. A gas venting device having an exhausting means for exhausting gas, comprising a backflow preventing means for preventing backflow of gas from the abdominal cavity to the main body when supply of gas is stopped. 2. The gas ventilation device according to claim 1,
The backflow prevention means is a gas line that bypasses at least part of the main body, and a throttle is provided in the middle of the gas line. 3. The gas ventilation device according to claim 1,
The exhaust means includes a flexible pipe connected to the abdominal cavity to serve as a gas discharge passage, and an operating device attached to the pipe to stop the flow of gas by crushing an intermediate portion of the pipe. Gas venting device characterized by. 4. The gas ventilation device according to claim 3,
The gas vent device according to claim 1, wherein the operating device includes detection means for detecting that the pipe is mounted in a predetermined state at a mounting portion thereof.