JP6057658B2 - Air supply device - Google Patents

Description

  The present invention relates to an air supply device.

Conventionally, in order to secure an operation field by an endoscope inserted into a body cavity, a method for inflating the body cavity by supplying air into the body cavity is known, and an air supply device for supplying air into the body cavity is known. (For example, refer to Patent Document 1).
This device integrates the air supply time and the gas flow rate measured by the flow sensor to grasp the total air supply amount supplied into the body cavity.

Japanese Patent No. 4776914

However, the flow rate sensor usually does not directly detect the flow rate itself, such as the amount of movement of the floating body or the temperature change of the sensor surface, and has a problem that the measurement accuracy is low. On the other hand, in the case where the body cavity to be expanded by supplying gas has a small volume compared to the abdominal cavity, it is natural that the amount of gas supplied compared to the abdominal cavity must be strictly controlled. A conventional air supply device using a flow sensor has a problem that it is difficult to strictly control the amount of gas.
Examples of the small volume body cavity include a subcutaneous cavity, a uterine cavity, and a pericardial cavity. For example, if the liquid or gas is excessively supplied to the pericardial cavity, there is a problem that the internal pressure increases and the heart is compressed.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an air supply device capable of strictly controlling the air supply amount.

In order to achieve the above object, the present invention provides the following means.
In one embodiment of the present invention, a supply source that supplies a gas, an air supply unit that can change its internal volume in order to suck and exhaust gas from the supply source, and gas is supplied from the supply source to the air supply unit A first conduit, a first valve for opening and closing the first conduit, a second conduit for supplying gas into the body cavity from the air supply section, and opening and closing the second conduit A second valve, a second pipe pressure detecting unit for detecting a pressure in the second pipe, a driving unit for changing a volume of the gas feeding unit, and a volume of the gas feeding unit by the driving unit ; Is expanded, the first valve is opened and the second valve is closed, and when the volume of the air supply unit is contracted by the drive unit, the first valve is closed and the second valve is closed. Provided is an air supply device including a controller that controls the first valve and the second valve so as to open the valve .

  According to this aspect, by opening the first valve, the gas from the supply source is supplied to the air supply unit through the first pipeline, and the volume of the air supply unit is expanded by the drive unit, Inhaled into the air supply section. Next, after the first valve is closed and the second valve is opened, the volume of the air supply unit is reduced by the drive unit, so that the gas sucked into the air supply unit passes through the second duct and the body cavity. Supplied in. At this time, since the pressure in the second pipeline is detected by the second pipeline pressure detection unit, based on the volume change of the air supply unit by the driving unit and the pressure in the second pipeline, The volume of the gas supplied into the inside can be calculated.

  That is, according to this aspect, the flow rate of the gas supplied into the body cavity is not detected by the flow rate sensor, but the gas once stored in the air supply unit is sent into the body cavity by contracting the volume of the air supply unit. Therefore, the volume of the gas supplied into the body cavity can be directly calculated and can be controlled more strictly.

In the above aspect, the control unit is configured to enter the body cavity based on the amount of change in the volume of the air supply unit by the driving unit and the pressure in the second duct detected by the pressure detection unit. calculating a supply amount of the gas, as the supply amount of gas into the body cavity becomes equal to the target amount, the driving unit may Gyoshi control the first valve and the second valve.

  In this way, the control unit controls the drive unit, the first valve, and the second valve using the volume of the gas supplied directly into the body cavity, and the target amount is accurately determined. Gas can be supplied into the body cavity.

Moreover, in the said aspect, it has the 1st pipe pressure detection part which detects the pressure in the said 1st pipe line, The said calculation part is the 1st pipe | tube detected by this 1st pipe line pressure detection part The volume of the gas to be supplied may be corrected based on the pressure in the passage.
By doing in this way, even if it uses what supplies a comparatively high pressure gas as a supply source, the volume of the atmospheric pressure conversion of the gas supplied to the air supply part can be calculated easily. As a result, the gas supply speed and the air supply time to the air supply unit can be shortened.

Moreover, in the said aspect, the said air supply part may have the cylindrical cylinder which forms a pressure chamber, and the partition which can move the inside of this cylinder to a longitudinal direction.
By doing in this way, the volume of a pressure chamber can be easily changed only by moving a partition in a cylinder. Further, the amount of change in volume can be accurately calculated based on the amount of movement of the partition walls. Therefore, the volume of gas supplied into the body cavity can be accurately controlled by the amount of movement of the partition wall and the pressure in the second duct.

Moreover, in the said aspect, the intake-exhaust port connected to the said 1st pipe line and the said 2nd pipe line is each provided in the longitudinal direction vicinity of the said cylinder, The said air supply part is the reciprocation of the said partition. During the movement, gas may be sucked and exhausted into pressure chambers formed on both sides of the partition wall.
In this way, when supplying the gas to the pressure chamber on one side of the partition wall, the gas can be discharged from the pressure chamber on the other side of the partition wall, and the supply of gas into the body cavity is efficient. Can be done well.

Moreover, in the said aspect, the open valve which open | releases the said 1st pipe line to air | atmosphere may be provided between the said 1st valve | bulb and the said air supply part.
In this way, after supplying a relatively high pressure gas from the supply source to the air supply unit, the first pipe line is opened to the atmosphere by opening the release valve, so that the gas stored in the air supply unit is released. The volume can be directly converted to atmospheric pressure.

Moreover, in the said aspect, you may provide the storage part which stores the gas supplied from the said supply source at atmospheric pressure between the said supply source and the said 1st valve | bulb.
By doing in this way, the volume of the gas accommodated in an air supply part can be directly converted into atmospheric pressure by storing the gas of the comparatively high pressure supplied from a supply source in a storage part.

  According to the present invention, it is possible to strictly control the air supply amount.

It is a block diagram which shows the air_supply apparatus which concerns on one Embodiment of this invention. It is a flowchart explaining the control by the control part of the air_supply apparatus of FIG. 3 is a timing chart corresponding to control according to the flowchart of FIG. 2. It is a block diagram which shows the 1st modification of the air_supply apparatus of FIG. It is a block diagram which shows the 2nd modification of the air_supply apparatus of FIG. It is a block diagram which shows the 3rd modification of the air_supply apparatus of FIG. It is a block diagram which shows the 4th modification of the air_supply apparatus of FIG. It is a block diagram which shows the 5th modification of the air_supply apparatus of FIG. It is a block diagram which shows the 6th modification of the air_supply apparatus of FIG. It is a flowchart explaining the control in the case of discharging | emitting the gas in a body cavity using the air supply apparatus of FIG. 11 is a timing chart corresponding to control according to the flowchart of FIG. 10.

An air supply device 1 according to an embodiment of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, an air supply device 1 according to the present embodiment includes a supply source 2 that supplies gas, a syringe (air supply unit) 3 for supplying gas, and the syringe 3 and supply source. 2 and a piping system 5 that connects the air feeding needle 4 that is punctured into the body cavity A, and a control unit 6 that controls the syringe 3 and the piping system 5.

  The supply source 2 supplies, for example, biocompatible carbon dioxide as a gas. The syringe 3 includes a cylindrical cylinder 3a, a piston (partition wall) 3b that can move in the longitudinal direction inside the cylinder 3a, and a linear motion mechanism (drive unit) 3c that moves the piston 3b in the longitudinal direction of the cylinder 3a. And an intake / exhaust port 3d at one end of the cylinder 3a.

  The piping system 5 supplies the first pipeline 5a that connects the supply source 2 and the syringe 3, the second pipeline 5b that connects the syringe 3 and the air supply needle 4, and the first pipeline 5a. A decompressor 7 that decompresses the gas to be discharged, a first electromagnetic valve (valve) 8 that opens and closes the first conduit 5a, a second solenoid valve (valve) 9 that opens and closes the second conduit 5b, A relief valve 10 for opening the first pipe line 5a between the first electromagnetic valve 8 and the syringe 3 to the atmosphere, and a first pipe line 5a between the first electromagnetic valve 8 and the syringe 3 And a second pressure sensor 12 for detecting the pressure in the second conduit 5b between the second electromagnetic valve 9 and the air feeding needle 4. Yes.

The air supply needle 4 is connected to a reservoir tank 14 and a suction device 15 via a pinch valve 13. By opening the pinch valve 13, the gas in the second conduit 5 b connected to the insufflation needle 4 can be sucked by the suction device 15, and the gas supplied into the body cavity A can be discharged from the body cavity A. It has become.
A gas buffer 16 is disposed between the second electromagnetic valve 9 and the air supply needle 4.

The control unit 6 controls the syringe 3 and the piping system 5 in accordance with the flowchart shown in FIG. A timing chart corresponding to each step is shown in FIG.
First, the volume (set volume) of gas supplied into the body cavity A and the pressure (set pressure) are set, the total air supply volume is reset (step S1), and control is started.

  When the control is started, first, the first electromagnetic valve 8 and the second electromagnetic valve 9 are closed, and the relief valve 10 is opened (step S2). As a result, the first conduit 5a and the second conduit 5b between the first solenoid valve 8 and the second solenoid valve 9 and the syringe 3 are opened to the atmosphere.

  Next, the linear motion mechanism 3c of the syringe 3 is operated, and the piston 3b is pushed in as much as possible so as to discharge all the gas in the cylinder 3a (step S3). In this state, the relief valve 10 is closed (step S4).

  Thereafter, the first electromagnetic valve 8 is opened (step S5), the linear motion mechanism 3c of the syringe 3 is operated, the piston 3b is pulled in the cylinder 3a, and the gas supplied from the supply source 2 is 3a is filled (step S6). In this state, the pressure in the first pipe 5a detected by the first pressure sensor 11, that is, the pressure value of the gas in the cylinder 3a is recorded (step S7).

  Then, the movement amount of the piston 3b is calculated from the detected pressure value, the set volume, and the total air supply amount (step S8). For example, when the set volume is 300 cc at atmospheric pressure and the pressure value detected by the first pressure sensor 11 is 101 kPa (gauge pressure), that is, 2 atm. It is possible to calculate the amount of movement of the piston 3b by the linear motion mechanism 3c for supplying the remaining volume which is obtained by subtracting the total amount of air supplied. When the maximum air supply amount of the syringe 3 at one time is 100 cc, the piston may be moved 1.5 times.

  Thereafter, the first electromagnetic valve 8 is closed, the second electromagnetic valve 9 is opened (step S9), and the piston 3b is moved in the cylinder 3a so as to satisfy the movement amount calculated in step S8. (Step S10). When the movement amount exceeds the movement amount for performing one maximum air supply of the syringe 3, it is moved by the movement amount for one maximum air supply, and the total air supply amount is integrated. (Step S11).

  In this state, the pressure value in the second pipeline 5b is detected by the second pressure sensor 12, and monitoring is performed until the pressure value becomes stable (step S12). If the stable pressure value exceeds the set pressure, an alarm is notified as an abnormal process (step S13), and the piston 3b is repeatedly pulled back until it becomes equal to or lower than the set pressure (step S14).

  If the stable pressure value in the second pipe line 5b detected by the second pressure sensor 12 is equal to or lower than the set pressure, it is determined whether or not the total air supply amount has reached the set volume (step). S15) If not reached, the processing from step S5 is repeated. When the total air supply amount reaches the set volume and when the pressure in the second pipe line 5b drops below the set pressure as a result of the abnormal process, the second solenoid valve 9 is closed (step S16). ), The control is terminated.

  According to the air supply device 1 according to the present embodiment configured as described above, the variable volume type that actually supplies the gas into the body cavity A, instead of measuring the supply amount of the gas by the flow rate sensor as in the past. Depending on the amount of movement of the piston 3b in the syringe 3 that is the air supply section, it is possible to directly supply the measured volume of the body. As a result, the volume of gas to be supplied can be precisely and precisely controlled, and it can be used to supply gas into a small body cavity other than the abdominal cavity where strict control is required. is there.

  Further, since the gas buffer 16 is disposed between the second electromagnetic valve 9 and the air feeding needle 4, even when the pressure of the gas in the syringe 3 is high, when the second electromagnetic valve 9 is opened, There is an advantage that the pressure is not directly transmitted into the body cavity A, and the pressure can be relieved.

  In the present embodiment, the pressure of the gas in the syringe 3 is detected by the first pressure sensor 11 and the supply amount is determined in terms of atmospheric pressure by the control unit 6, but instead of this, FIG. As shown, the first pressure sensor 11 may be eliminated, and the relief valve 10 may be opened instead of the detection step S7 by the first pressure sensor 11.

  By doing so, the pressure of the gas in the syringe 3 before being supplied into the body cavity A can be released to the atmospheric pressure, and the gas set to the atmospheric pressure can be supplied into the body cavity A. Therefore, there is an advantage that the volume of the gas in the syringe 3 does not need to be converted to atmospheric pressure by calculation, and the supplied volume itself may be integrated. However, the method of providing the first pressure sensor 11 can supply a gas having a pressure higher than the atmospheric pressure into the syringe 3 and supply the gas from the syringe 3 toward the body cavity A. There is an advantage that it can be shortened. In addition, since the pressure sensor 11 is generally expensive, there is an advantage that the device can be configured at a low cost if not used.

  Further, instead of the first pressure sensor 11, as shown in FIG. 5, a third electromagnetic valve 17 and a gas bag 18 may be arranged. When the gas is supplied to the syringe 3, the first electromagnetic valve 8 is closed and the third electromagnetic valve 17 is opened to supply the gas into the gas bag 18. As the gas bag 18, a gas bag provided with a pressure release valve may be adopted so that the internal pressure does not exceed atmospheric pressure, or the opening time of the third electromagnetic valve 17 is set to such an extent that the gas pressure sensor 18a does not inflate completely. You may adjust. By doing in this way, unlike the said method which makes atmospheric pressure with the relief valve 10 after supplying high pressure gas to the syringe 3, the gas of substantially atmospheric pressure can be supplied to the syringe 3.

  Also, as shown in FIG. 6, two syringes 3 and the above piping system 5 are provided, and when the gas is supplied to the body cavity A by one syringe 3, the other syringe 3 is filled with gas. Also good. By doing in this way, there exists an advantage that the time required for air supply can be shortened.

  Further, as shown in FIG. 7, instead of the two syringes 3, a single cylinder 3a having intake and exhaust ports 3d at both ends in the longitudinal direction and the inside of the cylinder 3a moving in the longitudinal direction are formed on both sides. It is also possible to employ one having partition walls 3b that alternately expand and contract the volume of the two pressure chambers. In this case, it is necessary to provide a displacement meter 3e that detects the amount of movement of the partition wall 3b.

  Further, in FIG. 1, the control unit 6 controls the linear motion mechanism 3c to move the piston 3b, but instead of this, as shown in FIG. 8, a drive to move the piston 3b. It is good also as providing the handle 3f which an operator operates as a part, and the stopper 3g which restrict | limits the moving amount | distance of the handle 3f.

  The stopper 3g is set at a position where it abuts against the handle 3f when a set volume of gas is filled in the syringe 3, and the control unit 6 has a filling button 19 for instructing the gas syringe 3 to start filling, A buzzer 20 for informing the end of filling is connected.

  When the filling button 19 is pushed while the piston 3b is pushed to the maximum extent, the control is started, the second electromagnetic valve 9 and the relief valve 10 are closed, and the first electromagnetic valve 8 is opened. Thereby, the gas is supplied to the syringe 3 with the pressure after the decompressor 7, and the piston 3b and the handle 3f are moved by the gas until they reach the stopper 3g.

Thereafter, the first electromagnetic valve 8 is closed and the relief valve 10 is opened, so that the gas in the syringe 3 is released to atmospheric pressure. When the first pressure sensor 11 detects that the gas in the syringe 3 has become atmospheric pressure, the relief valve 10 is closed, the second electromagnetic valve 9 is opened, and the buzzer 20 is sounded.
As a result, the operator knows that the filling of the gas into the syringe 3 has been completed. Therefore, by pushing the handle 3f and pushing the piston 3b to the maximum extent, the volume of gas filled in the syringe 3 can be accurately measured. It can be supplied to the body cavity A.

In FIG. 1, the gas is supplied into the body cavity A by the syringe 3, and the gas is discharged from the body cavity A by the aspirator 15 by opening the pinch valve 13. Instead of the vessel 15, it may be used for gas discharge.
In this case, the gas supply syringe 3 may be used together for gas exhaust, or, as shown in FIG. 9, a gas discharge syringe 3A may be provided separately from the gas supply syringe 3. You may prepare. By doing in this way, there exists an advantage that it is not necessary to return the gas supplied in the body cavity A to the syringe 3 for supply.

  When the gas supply syringe 3 is used together for gas exhaustion in the gas supply device 1 of FIG. 1, the gas discharge by the syringe 3 is shown in the flowchart of FIG. 10 and the timing chart of FIG. 11, for example. First, the first solenoid valve 8 and the second solenoid valve 9 are closed, and the relief valve 10 is opened (step S21). As a result, the first conduit 5a and the second conduit 5b between the first solenoid valve 8 and the second solenoid valve 9 and the syringe 3 are opened to the atmosphere.

Next, the linear motion mechanism 3c of the syringe 3 is operated, and the piston 3b is pushed in as much as possible so as to discharge all the gas in the cylinder 3a (step S22). In this state, the relief valve 10 is closed (step S23).
The amount of movement of the piston 3b is calculated from the set volume and the total intake volume set when the gas is supplied (step S24), the first solenoid valve 8 is closed, and the second solenoid valve 9 is opened (step S24). S25).

  The piston 3b is moved in the cylinder 3a so that the movement amount calculated in step S24 is satisfied (step S26). If the movement amount exceeds the movement amount for one maximum intake of the syringe 3, the movement amount is moved by the movement amount for one maximum intake, and the total intake amount is integrated (step S27). ).

  In this state, the pressure value in the second pipeline 5b is detected by the second pressure sensor 12, and monitoring is performed until the pressure value becomes stable (step S28). If the stable pressure value does not exceed the set pressure, an alarm is notified and the piston 3b is pushed back as abnormal processing (step S29), and the piston 3b is pushed back until the set pressure is exceeded (step S29). Step S30).

  When the stable pressure value in the second pipe line 5b detected by the second pressure sensor 12 is equal to or higher than the set pressure, it is determined whether or not the total intake amount has reached the set volume (step S31). ), If not reached, the process from step S21 is repeated. When the total intake amount reaches the set volume and when the pressure in the second pipe 5b rises above the set pressure as a result of the abnormal process, the second solenoid valve is closed (step S32), Control is terminated.

  In the above description, an air supply needle is used to supply air to the body cavity. However, air may be supplied via a sheath for inserting an endoscope used for observing the body cavity into the body cavity. Further, air may be supplied to the body cavity from the air / water supply channel of the endoscope.

A body cavity 1 air supply device 2 supply source 3 syringe (air supply unit)
3a Cylinder 3b Piston (partition wall)
3c Linear motion mechanism (drive unit)
3d Intake / exhaust port 5a 1st pipe line 5b 2nd pipe line 6 Control part 8 1st solenoid valve (1st valve)
9 Second solenoid valve (second valve)
10 Opening Valve 11 First Pressure Sensor (First Pipeline Pressure Detection Unit)
12 2nd pressure sensor (2nd pipe line pressure detection part)
18 Gas bag (storage)

Claims (7)

A supply source for supplying gas;
An insufflation portion whose internal volume can be changed in order to intake and exhaust gas from the supply source;
A first pipe for supplying gas from the supply source to the air supply unit;
A first valve for opening and closing the first conduit;
A second conduit for supplying gas into the body cavity from the air supply section;
A second valve for opening and closing the second conduit;
A second pipe pressure detector for detecting the pressure in the second pipe;
A drive unit for changing the volume of the air supply unit ;
When the volume of the air supply unit is expanded by the drive unit, the first valve is opened and the second valve is closed, and when the volume of the air supply unit is contracted by the drive unit, the first valve is closed. An air supply device comprising: the first valve and a control unit that controls the second valve so as to close one valve and open the second valve . The control unit determines the amount of gas supplied into the body cavity based on the amount of change in the volume of the air supply unit by the drive unit and the pressure in the second duct detected by the pressure detection unit. calculated, as in the supply amount of gas into the body cavity becomes equal to the target amount, the driving unit, the gas supply apparatus according to 請 Motomeko 1 that controls the first valve and the second valve. A first pipe pressure detector for detecting the pressure in the first pipe;
The air supply device according to claim 2, wherein the control unit corrects the volume of the gas to be supplied based on the pressure in the first pipeline detected by the first pipeline pressure detection unit.   The air supply device according to any one of claims 1 to 3, wherein the air supply unit includes a cylindrical cylinder that forms a pressure chamber, and a partition wall that is movable in the longitudinal direction within the cylinder. Intake and exhaust ports connected to the first pipe line and the second pipe line are provided in the vicinity of both ends in the longitudinal direction of the cylinder,
The air supply device according to claim 4, wherein the air supply unit sucks and exhausts gas into a pressure chamber formed on both sides of the partition during the reciprocating movement of the partition.   The air supply device according to any one of claims 1 to 5, wherein an opening valve that opens the first pipe line to the atmosphere is provided between the first valve and the air supply unit.   The air supply device according to any one of claims 1 to 5, further comprising a storage unit configured to store a gas supplied from the supply source at an atmospheric pressure between the supply source and the first valve.

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