JP3250744B2 - Gas ventilation device and its abnormality determination device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas ventilation device for supplying gas such as CO2 gas into the abdominal cavity of a human body or an animal, and an abnormality judging device therefor. Available when you do.

[0002]

2. Description of the Related Art In recent years, surgery has been performed in which a forceps, an electric scalpel or the like which can be operated outside the body is inserted into a pipe-shaped instrument punctured in the abdomen, and the operation is performed while looking into the abdominal cavity with an endoscope. Such surgery does not require a large incision in the abdomen,
There are merits such as the wound by the operation is extremely small, and post-operative recovery is quick.

In performing such an operation, a gas such as CO ₂ gas is supplied into the abdominal cavity to inflate the abdomen. For the supply of the gas, a gas ventilation device that adjusts the pressure, the flow rate, and the like to a predetermined value is used.

In such a gas ventilation device, pressure detecting means such as a pressure sensor is provided in the middle of a gas line for introducing gas into the abdominal cavity, and a resistance pressure value of the gas line determined in advance is supplied during gas supply. There is a device that subtracts from a detected pressure value and thereby detects a static pressure value in the abdominal cavity, for example, a device disclosed in Japanese Patent Publication No. 2-14843.

[0005] In such a device, when supplying gas into the abdominal cavity, after the disturbance of the pressure at the start of the supply is reduced,
Before the inside of the abdominal cavity is pressurized, the pressure detection unit detects the pressure, thereby detecting the resistance pressure value of the gas line.

[0006]

Here, in ordinary examinations and operations, the flow rate of the gas supplied into the abdominal cavity is often changed, and the resistance pressure of the gas line changes due to the change in the flow rate. It is necessary to correct the resistance pressure value obtained in advance. However, in the above-described ventilation device, the resistance pressure value of the gas line can be obtained only when the supply of the gas that is not pressurized in the abdominal cavity is started. It is necessary to exhaust the gas inside and restart the gas supply from the beginning. Therefore, there is a problem that it is difficult to correct the resistance pressure value.

Further, in order to detect an abnormality in static pressure measurement caused by a clogged pipe or the like, the same type of pressure detecting means is added to duplicate the measuring system, and the two obtained static pressure values are compared. By detecting the difference between the static pressure values, it is possible to detect an abnormality in the measurement system. However, even with such duplexing, it is not easy to determine which of these static pressure values is abnormal, and there is a problem that the reliability of the detected static pressure value cannot be improved simply by duplexing.

SUMMARY OF THE INVENTION An object of the present invention is to provide a gas ventilation device which facilitates correction of a resistance pressure value and improves the reliability of a detected static pressure value, and an abnormality determination device therefor.

[0009]

According to a first aspect of the present invention, a gas such as CO ₂ gas is supplied at a predetermined flow rate into the abdominal cavity of a human or animal through a pipe-shaped ventilator punctured in the abdomen. to the flow sensor <br/> for measuring the flow rate of the gas, and a flow regulating valve for regulating the flow rate of the gas, the flow cell
And a flow control unit for operating a flow control valve based on the measured value of the sensor, wherein the intermittent operation is provided in the middle of a gas line through which the gas flows and intermittently supplies the gas. and use flow path opening and closing means, the intermittent flow MichiHiraki
A pressure sensor for detecting the pressure of the gas downstream of the gas line than closing means, and control means for controlling the intermittent flow path opening and closing means by the output of the pressure sensor, the
Monitor the output of the flow sensor to detect changes in the flow rate of the gas.
And a flow rate measuring unit that knowledge, the control means, the cross-sectional
Opening the flow passage opening / closing means for the gas to flow the gas,
A gas supply mode for supplying the gas into the cavity, and the intermittent
The flow passage opening / closing means is closed to stop the flow of the gas.
Static pressure detection for detecting the static pressure in the abdominal cavity with the sensor in a state
Inspection mode and two operation modes,
Each time the stage detects a change in the flow rate of the gas, the gas supply
After switching from the mode to the static pressure inspection mode,
Control to return to the gas supply mode.
The control means includes the gas supply mode from the gas supply mode.
Immediately before switching to the static pressure inspection mode, the total pressure value detected by the pressure sensor is switched to the static pressure inspection mode.
The calculated and holding unit for holding the static pressure detected by a pressure sensor, a resistance pressure value of the gas line on the previous SL total pressure value and the static pressure value after a predetermined time has passed since, and this The resistance pressure value is held inside, and the gas supply
Have an arithmetic unit is provided from a pressure value detected during supply mode seek static pressure within the abdominal cavity by subtracting the resistance pressure value
Characterized in that that.

[0010] The second invention of the present invention relates to a gas ventilator for supplying gas such as CO2 gas at a predetermined flow rate into the abdominal cavity of a human or animal through a pipe-shaped ventilator penetrating the abdomen. a determination that abnormality judgment device, a first pressure sensor for detecting the gas pressure in the gas line, a second pressure sensor for detecting the gas pressure in the abdominal <br/> cavity directly, before
And the total pressure value detected by the first pressure sensor immediately before interrupting the supply of serial gas, is between a predetermined time after stopping the supply of the gas
When the first to calculate the resistance pressure value of the gas line on the basis of the static pressure detected by the pressure sensor is stored when have elapsed
In both cases, the first static pressure value is calculated by subtracting this resistance pressure value from the output value of the first pressure sensor during the supply of the gas.
Arithmetic circuit and comparison result together with a second static pressure obtained by the first static pressure value and the second pressure sensor that
When the first and second static pressure values match ,
2 is output, and when the first and second static pressure values do not match, the change states of the first and second static pressure values are further compared, and these change states are synchronized. When
Outputs a second static pressure value, and the first static pressure value is the second static pressure value.
If it changes later than the value, output the first static pressure value.
And a comparator circuit for outputting a first static pressure value
And a display circuit for displaying an abnormality .

Here, in comparing the change states of the first and second static pressure values, one of the first and second static pressure values which is not present in the other is monitored, whereby the first and second static pressure values are monitored. It is sufficient to determine which of the second static pressure values is abnormal. At this time, for example, in the event of an abnormality, there is no delay in the change in the first static pressure value, and there is a delay in the change in the second static pressure value, and this delay can be adopted as a determination reference.

[0012]

According to the first aspect of the present invention, the gas is shut off.
Sometimes, there is no gas flow and the static pressure in the abdominal cavity is
On the other hand, when the gas is supplied,
And the sum of the static pressure in the abdominal cavity and the pressure resistance of the gas line
The total pressure of a gas is detected by a pressure sensor. For this reason,
From the total pressure value detected by the pressure sensor during gas supply,
If the static pressure value detected by the pressure sensor during
Sline pressure resistance can be calculated and detected by pressure sensor
If the gas line pressure resistance is subtracted from the current pressure value,
Even during supply of the body, static pressure in the abdominal cavity is required. Moreover,
When the flow rate measuring means detects a change in the gas flow rate, the gas supply
Mode to static pressure test mode, and then
Control to return to the gas supply mode
Detects total pressure value and static pressure value every time there is a change in flow rate
Therefore, it is possible to easily correct the pressure resistance value of the gas line.
Here, a predetermined time after switching in the static pressure inspection mode
Since the static pressure value is detected after the passage, the intermittent flow path
Detection of static pressure without being affected when the opening / closing means is closed
Can be performed, and the above-mentioned predetermined time is a gradual change in the abdominal cavity.
Shorten so that the static pressure change is negligibly small.
Set from gas supply mode to static pressure inspection mode
Immediately before switching, it is included in the total pressure value detected by the pressure sensor.
And the static pressure value detected during the static pressure test mode.
Can be regarded as equal, the resistance pressure value of the gas line is positive.
Correction is assured. Therefore, even if there is a change in the flow rate of the gas, such that outgassing intraperitoneal Ku, easily and accurately perform the correction of the resistance pressure value of gas Surain, static intraabdominal
Ing as pressure is accurately detected.

According to a second aspect of the present invention, a first pressure sensor for indirectly detecting a static pressure value in an abdominal cavity and a second pressure sensor for directly detecting a static pressure value in an abdominal cavity are provided. By the pressure sensor described above, two types of measurement systems in which the state of change of the static pressure value is different when an abnormality occurs are formed. Therefore, when an abnormality is detected, attention is paid to a change that is present on one side but not on the other side, and if this change is detected, it is possible to determine which static pressure value has an abnormality, thereby achieving the above object.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a piping system of a gas ventilation device 10 of the present embodiment. The gas ventilation device 10 has a control device installed in the middle of a gas line 1A connecting the supply source 1 and the abdominal cavity 2. is there.

The supply source 1 is a cylinder in which a gas such as CO ₂ gas is compressed and sealed. A first ventilator 3, which is a pipe-shaped needle, is punctured into the abdominal cavity 2, and the gas of the supply source 1 is supplied from the gas line 1A via the ventilator 3.

The gas ventilating device 10 includes a pressure reducing valve 11, a solenoid valve 12, a flow sensor 13, a flow regulating valve 14, a first
Pressure sensor 15 and a second pressure sensor 16 are provided,
11 to 15 of these series of control equipment are gas line 1A
Are installed sequentially from the upstream side, and among these control devices, those that are moving include a control device 20 as control means.
Is controlled by The pressure sensor 16 is a gas line
It is connected to the abdominal cavity 2 via a second ventilator 4 separately from 1A.

The pressure reducing valve 11 reduces the pressure of the high-pressure gas sent from the supply source 1 to a predetermined pressure.

The solenoid valve 12 is an intermittent valve for interrupting the supply of gas.
Channel opening / closing means for opening / closing according to a control signal of the control device 20. When the solenoid valve 12 is opened,
The control device 20 performs a gas supply mode described later.
On the other hand, by closing the solenoid valve 12, the control device 20
A static pressure inspection mode described later can be performed.

Each of the flow sensor 13 and the flow control valve 14 is a device for controlling the flow rate of gas to a predetermined amount. Flow sensor 13 is for measuring the flow rate of the gas flowing in gas line 1A, the controller a predetermined signal corresponding to the flow rate
And outputs it to the 20. The flow control valve 14 performs an opening / closing operation to adjust the flow rate of the gas flowing through the gas line 1A so as to have an opening corresponding to a control signal of the control device 20.

The pressure sensor 15 detects the pressure of the gas in the gas line 1A, and outputs a signal corresponding to the detected pressure value to the control device 20.

The pressure sensor 16 detects the static pressure of gas in the abdominal cavity 2, and outputs a signal corresponding to the detected static pressure value to the control device 20.

FIG. 2 shows an outline of an electric circuit of the control device 20. The control circuit 20 includes a pressure measuring system circuit 21 for detecting a static pressure in the abdominal cavity 2, a flow measuring system circuit 22 for detecting a flow rate of gas supplied to the abdominal cavity 2, and these circuits 21, 22. And the like, and an operation system circuit 23 for performing a control operation on the same.

The pressure measuring system circuit 21 has first and second pressure detecting means 21A and 21B of different types.
The first pressure detecting means 21A calculates a static pressure value in the abdominal cavity 2 based on the pressure value P1 of the gas line 1A detected by the first pressure sensor 15.
It detects P3 indirectly. Second pressure detecting means
Reference numeral 21B is for the second pressure sensor 16 to directly detect the static pressure value P2 in the abdominal cavity 2.

The first pressure detecting means 21A includes hold circuits 210 and 211 as a holding unit, and an arithmetic circuit 21 as an arithmetic unit.
2 is provided.

The hold circuit 210 operates in the gas supply mode.
During operation, that is, when supplying gas, the pressure sensor 15
The pressure value (hereinafter, referred to as a total pressure value H1) detected at the step S1 is held. Hold circuit 211 operates in static pressure test mode
Pressure sensor when the gas supply is interrupted
The pressure value (hereinafter referred to as static pressure value H2) detected at 15 is held.

The arithmetic circuit 212 calculates and stores the resistance pressure value dP by subtracting the static pressure value H2 from the total pressure value H1 of the hold circuits 210 and 211, and also stores the pressure value P1 directly output from the pressure sensor 15. Pressure value in the abdominal cavity 2 by subtracting the resistance pressure value dP from
This is to calculate P3. Then, the arithmetic circuit 212 outputs the static pressure value P3 obtained by the calculation when supplying the gas,
When the gas supply is interrupted, the pressure value P1 directly detected by the pressure sensor 15 is output as it is as the static pressure value P3.

The pressure measurement system circuit 21 displays a comparison circuit 213 for comparing the static pressure values P2 and P3 obtained by the first and second detection means 21A and 21B, and an output value PI of the comparison circuit 213 and the like. A display circuit 214 and a pressure setting device 215 for setting a set pressure value PS in static pressure control of the abdominal cavity 2 are provided. The comparison circuit 213 is a comparing means for comparing the static pressure values P2, P3 and their change state, and selects one of the static pressure values P2, P3 according to the comparison result and outputs it as an output value PI. is there. That is, when the static pressure values P2 and P3 match, the comparison circuit 213 outputs the static pressure value P2 as the output value PI. On the other hand, when the static pressure values P2 and P3 do not match, the change state of the static pressure values P2 and P3 is further compared. At this time, when the change states of the static pressure values P2 and P3 are synchronized, the static pressure value P2 is output as the output value PI.
Output from 3. On the other hand, when the change state of the static pressure value P2 is delayed more than the change state of the static pressure value P3, the static pressure value P3 is used as the output value PI.
Is output from Where the pressure
Sensors 15 and 16, arithmetic circuit 212, comparison circuit 213, and
The abnormality determination device includes the display circuit 214.

The flow rate measuring system circuit 22 is a flow rate measuring means for monitoring the flow rate of the supplied gas and detecting a change in the flow rate value. The flow measurement system circuit 22 includes a hold circuit 220 that holds the flow value F obtained by the flow sensor 13, a comparison circuit 221 that performs a mutual comparison between the flow value F of the flow sensor 13 and the hold value H3 of the hold circuit 220, A timer circuit 222 for delaying the transmission of the comparison result of the comparison circuit 221 is provided.

After a lapse of a predetermined time, the hold circuit 220
The held flow value F is output as the held value H3, and the held value
After the output of H3, store the new flow value F and always keep the value
H3 will be updated. The comparison circuit 221 compares the flow value F with the hold value H3, and outputs a control signal to the timer circuit 222 when the flow value F and the hold value H3 are different. The timer circuit 222 controls the solenoid valve 12 for a desired time.
In order to maintain the open state, a predetermined time is set.

The operation system circuit 23 includes a main control circuit 230 that outputs operation signals based on various signals from the pressure measurement system circuit 21 and the flow measurement system circuit 22, and a flow control based on the flow value F of the flow sensor 13. And a valve operation circuit 231 as a flow control unit for operating the valve 14.

The main control circuit 230 is constituted by a microprocessor or the like, and performs opening and closing operations of the solenoid valve 12 so as to reach the set pressure value PS while monitoring the static pressure value PI. When the flow measurement system circuit 22 detects a change in the flow value F, the main control circuit 230 closes the solenoid valve 12 and supplies the gas.
Mode to static pressure test mode, and the static pressure value in the abdominal cavity 2
Is detected, and the resistance pressure value dP is corrected by the pressure measurement system circuit 21 with the static pressure value.

The valve operation circuit 231 includes a setting section for setting the flow rate of the gas flowing through the gas line 1A. The gas flow rate is adjusted by operating the valve operation circuit 231 as needed. The main control circuit
The operation circuit 230 and the operation circuit 231 are electrically connected to each other, and the value set by the setting unit of the operation circuit 231 can be locked according to the use state of the pressure sensors 15 and 16.
That is, when static pressure detection is performed by the pressure sensor 15, the set value of the valve operation circuit 231 is automatically locked, and cannot be changed unless this lock is released. On the other hand, when the pressure sensor 16 is performing static pressure detection, the lock of the set value of the valve operation circuit 231 is automatically released.

Next, the operation of this embodiment will be described. The gas ventilation device 10 of the present embodiment operates according to a main routine shown in the flowchart of FIG. First, the gas ventilation device 10
In order to operate the gas ventilator 3, the ventilators 3 and 4 are punctured in advance in the abdomen of the human body or animal to be operated, and the gas ventilator 10 is turned on to activate the gas ventilator 10. You
Then, the solenoid valve 12 opens and the supply of gas is started.
Thus, the gas supply mode is started , and step S001 in FIG.
The operation is started from.

In step S001, an initial value 1 of the control parameter N is set. In steps S002 and S003,
The pressure value P2 of the second pressure detecting means 21B is unconditionally selected as the static pressure value PI to be input to the main control circuit 230, and the selected pressure value P2 is input to the main control circuit 230.

In step S004, the input static pressure value PI is compared with the set value PS. Here, the static pressure value PI is equal to the set value PS
Is equal to or greater than the set value PS,
Returning to step S003, the static pressure value PI is updated and the comparison of the static pressure value is continued. When the static pressure value PI is smaller than the set value PS, the process proceeds to step S005 to open the solenoid valve 12. This
The operation mode of the control device 20 changes from the static pressure test mode to the
Return to body supply mode.

In step S006, by checking the value of the control parameter N, it is determined whether or not the calculation result such as the resistance pressure value dP of the gas line 1A has already been obtained. If the value of the control parameter N is not 1, the procedure goes to a subroutine for detecting an abnormality in the static pressure value (see FIG. 4), and after completing a predetermined process, proceeds to step S007. The value of the control parameter N is 1
If, the process proceeds directly to step S007.

In step S007, the static pressure value PI output from the comparison circuit 213 is compared with the set value PS. Static pressure value
When PI is smaller than the set value PS, the process proceeds to a subroutine for detecting a change in the flow rate (see FIG. 5). After performing a predetermined process, the process proceeds to step S007 or S008 according to the conditions set in the subroutine. Static pressure value PI is the set value
When it is equal to PS or larger than the set value PS, the process proceeds to the next step S008.

In step S008, an operation described later (see FIG. 6) is performed to determine the resistance pressure value dP of the gas line 1A, and then steps S003 to S008 are repeated until the operation is completed. In step S008, the electromagnetic valve 12 is closed, whereby the static pressure test mode is started , and the control of the static pressure is also performed.

FIG. 4 is a flowchart showing a subroutine for detecting an abnormality in the static pressure value. This subroutine is started from step S101. Steps S101 to S1
In 02, the latest pressure values P1 and P2 are detected by the first and second pressure sensors 15 and 16, and the resistance pressure value dP obtained in step S008 is subtracted from the pressure value P1. Calculate the pressure value P3.

In step S103, the static pressure value obtained by calculation
P3 is compared with the directly detected static pressure value P2. Static pressure value P
If the values P2 and P3 do not coincide with each other, the process proceeds to step S104 to determine which of the static pressure values P2 and P3 is abnormal. When the static pressure values P2 and P3 match each other, the process proceeds to step S110.

In step S104, it is checked whether the static pressure values P2 and P3 are changing in synchronization with each other. As shown in FIG. 7, when the static pressure values P2 and P3 change synchronously, the process proceeds to step S110. As shown in FIG. 8, when the static pressure values P2 and P3 do not change synchronously, such as when one changes with a delay with respect to the other, the process proceeds to step S105.

In step S105, the output value of the comparison circuit 213
Select the static pressure value P3 as PI, and in the next step S106, select the static pressure value.
In addition to displaying P3, the display circuit 214 indicates that the piping system of the second pressure sensor 16 is clogged.

In step S110, the output value of the comparison circuit 213
The static pressure value P2 is selected as PI. Then, step S106
Alternatively, after completion of step S110, the process returns to step S007 of the main routine.

FIG. 5 shows a subroutine for detecting a change in the flow rate. This subroutine is started from step S201. In step S201,
Check the value of the control parameter N. When the parameter N is equal to 1, it is determined that the flow value F is not stored in the hold circuit 220, and the process proceeds to step S210 where the flow value F is stored. When the parameter N is not equal to 1, a series of steps S202 to S204 for detecting a change in the flow rate are performed.

In steps S202 to S204, the latest flow rate value F obtained by the flow rate sensor 13 is compared with a held value H3 which is a flow rate value held in the hold circuit 220. When the flow rate value F is equal to the hold value H3, it is determined that there is no change in the flow rate value F, and the process proceeds to step S210 to store a new flow rate value F and update the hold value H3. When the flow value F and the hold value H3 are not equal, the process proceeds to step S205.

In step S205, after waiting for the time set in the timer circuit 222 to maintain the open state of the solenoid valve 12, the new resistance pressure value updated by the flow rate change is set.
In order to obtain dP, the process returns to step S008 of the main routine.

In steps S210 and S211, the hold circuit 22
The latest flow rate value F is stored in 0, and 1 is added to the parameter N. Then, the process returns to step S007 of the main routine. here,
By adding 1 to the parameter N, it is possible to determine that the flow value F has been stored in the hold circuit 220.

FIG. 6 shows a detailed procedure of step S008 of the main routine. This procedure is started from step S801.

[0049] First of all, all the pressure value at the time of the gas supply in step S80 2
After holding the H1 is hold circuit 210 closes the electromagnetic valve 12 at step S80 3. Then, so as not to be affected by the closing of the solenoid valve 12 at Step S80 4, after waiting a predetermined time T1, and holds the static pressure H2 of time supply interruption of gas-hold circuit 211 in step S80 5. Here, the timing of detecting the total pressure value H1 and static pressure H2 is are I Do within one second before and after the center instant of closing of the solenoid valve 12.

In the following steps S806 and S807, the static pressure value H2 is subtracted from the obtained total pressure value H1 to calculate the resistance pressure value dP of the gas line 1A, and the calculation processing of the resistance pressure value dP ends.

According to the above-described embodiment, the following effects can be obtained. The supply of gas can be performed intermittently by opening and closing the solenoid valve 12 provided in the gas line 1A, and when the gas is supplied or interrupted, the total pressure value H1 and the static force value H2 are detected, and these total pressure values HI And gas line 1A based on static pressure value H2
Since the resistance pressure dP of the gas line 1A is obtained, it is not necessary to discharge the gas from the abdominal cavity 2 even if the flow rate of the gas is changed, and the resistance pressure dP of the gas line 1A can be easily corrected.

Further, a first pressure detecting means 21A and a second pressure detecting means 21B, which are two different kinds of measuring systems, are provided, and the static pressure values P3 and P2 obtained thereby are compared, and these are different. In some cases, the comparison circuit 213 also detects that the static pressure value P2 changes later than the static pressure value P3, so that it is possible to determine which is abnormal. Therefore, a correct value can be selected, and the reliability of the detected static pressure value can be improved.

Further, two measurement systems of the first pressure detecting means 21A and the second pressure detecting means 21B are provided so that the function of the gas ventilating device 10 can be maintained even if one of the measuring systems fails, so that the gas The reliability of the ventilation device 10 can be improved.

The flow rate measuring system circuit 22 monitors the flow rate of the gas supplied into the abdominal cavity 2 and detects a change in the flow rate value.
When the flow rate value changes, the resistance pressure value dP of the gas line 1A is automatically corrected, so that the appropriate resistance pressure value dP can always be maintained and the burden on the practitioner during surgery Absent.

The present invention is not limited to the above-described embodiment, but includes the following modifications. That is, in the above-described embodiment, when comparing the change states of the first and second static pressure values, the delay caused when the second static pressure value is abnormal is used as the determination criterion, but the determination criterion is not limited to the delay. For example, a difference in fluctuation period, an amplitude, or the like may be employed. In short, a change in the first and second static pressure values that is present on one side but not on the other side may be used as a determination reference.

The intermittent means is not limited to an electromagnetic valve, but may be, for example, an electric valve driven by a motor or the like, or a valve driven by gas pressure.

Further, the means for adjusting the flow rate is not limited to the type in which the flow rate sensor and the flow rate adjustment valve are separate bodies, and may be, for example, an integrated type which is operated by a mechanical control mechanism.
When such an integrated type is adopted, a separate flow rate sensor may be provided to measure the flow rate.

In the above embodiment, the means for adjusting the flow rate such as the flow rate sensor and the intermittent means are provided separately.
These need not necessarily be separate bodies, and for example, one in which all of the intermittent means and the means for adjusting the flow rate may be integrally formed may be used.

The procedure for detecting the change in the flow rate F is not limited to the procedure for correcting the resistance pressure value dP. For example, a procedure for adjusting the pressure in the abdominal cavity 2 is inserted between the two procedures. May be. In this case, as a control method for adjusting the pressure, for example, a so-called time control method in which the opening and closing of the electromagnetic valve 12 is repeated at a predetermined cycle and the pressure sensor 15 detects the pressure when the electromagnetic valve 12 is closed to adjust the pressure to a predetermined pressure is used. Can be adopted. By adjusting the pressure in such a manner, even if the pressure in the abdominal cavity 2 fluctuates due to a change in the flow rate of the gas, the pressure in the abdominal cavity 2 can be quickly corrected to a predetermined value, and individual differences in the operated human body and the like occur. Even if there is, the pressure in the abdominal cavity 2 can be adjusted accurately.

[0060]

As described above, according to the present invention, the resistance pressure value can be easily corrected, and the reliability of the detected static pressure value can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a piping system according to one embodiment of the present invention.

FIG. 2 is a block diagram showing an electric circuit of a control device provided in the embodiment.

FIG. 3 is a flowchart showing a main routine of the embodiment.

FIG. 4 is a flowchart showing a subroutine of the embodiment.

FIG. 5 is a flowchart showing a subroutine different from that of FIG. 4 of the embodiment.

FIG. 6 is a flowchart illustrating details of step S008 in FIG. 3;

FIG. 7 is a graph showing a state in which the static pressure value P3 and the static pressure value P2 obtained by the first and second pressure detecting means 21A and 21B are synchronized.

FIG. 8 is a graph showing a state in which the static pressure value P2 obtained by the second pressure detecting means 21B changes with a delay with respect to the static pressure value P3 obtained by the first pressure detecting means 21A.

[Explanation of symbols]

1A gas line 2 abdominal cavity 3 first ventilator 4 second ventilator 10 gas venting device 12 solenoid valve as opening / closing flow opening / closing means 13 flow sensor 14 flow regulating valve 15 first pressure sensor 16 second pressure Sensor 20 Control device as control means 21A First pressure detection means 21B Second pressure detection means 210, 211 Hold circuit as holding section 212 Calculation circuit as calculation section 213 Comparison circuit as comparison means 214 Display circuit 22 Flow rate Flow measurement system circuit as measurement means 231 Valve operation circuit as flow control unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) A61B 1/00-1/32

Claims (5)

(57) [Claims] 1. A flow rate for measuring a flow rate of a gas such as CO ₂ gas in order to supply a predetermined flow rate of a gas such as CO ₂ gas into the abdominal cavity of the human body or an animal through a pipe-shaped ventilator punctured in the abdomen. A gas ventilation device comprising: a sensor , a flow control valve for adjusting a flow rate of the gas, and a flow control unit that operates the flow control valve based on a measurement value of the flow sensor , wherein the gas flows An intermittent flow path opening / closing means that is provided in the middle of a gas line to intermit the supply of the same gas, and a pressure sensor that detects the pressure of the gas at a downstream side of the gas line from the intermittent flow path opening / closing means, Control means for controlling the intermittent flow path opening / closing means based on the output of the pressure sensor; and a change in the flow rate of the gas by monitoring the output of the flow rate sensor.
And a flow rate measuring means for detecting the flow rate , wherein the control means opens the intermittent flow path opening / closing means and
A gas that circulates gas and supplies the gas into the abdominal cavity
In the supply mode, the gas flow is closed by closing the intermittent flow path opening / closing means.
Stop circulation of the body, and in this state, reduce the static pressure in the abdominal cavity
Two operation modes, static pressure inspection mode detected by sensor
Wherein the flow rate measuring means detects a change in the flow rate of the gas.
The static pressure test mode from the gas supply mode
And then returns to the gas supply mode again
Performs control so as, in the control unit, the static pressure from the gas supply mode
Immediately before switching to the inspection mode, the total pressure value detected by the pressure sensor and after switching during the static pressure inspection mode
And a static pressure detected by the pressure sensor after a predetermined time has elapsed
A holding unit for holding, calculates the resistance pressure value of the gas line on the previous SL total pressure value and the static pressure, and holds the this resistance pressure value inside, in the gas supply mode a calculation unit for determining the static pressure in the abdominal cavity from the sensed the pressure value by subtracting the resistance pressure value, the gas venting device, characterized in that is provided. The gas venting apparatus according to claim 1, wherein the ventilation unit and the pressure sensor is a first insufflator and the first pressure sensor, respectively it, first of
The ventilation device and the first pressure sensor, the holding portion and the front
Serial constructed the first pressure detecting means by a calculation unit, further, the first vent condenser and the first alternative second insufflator and the second pressure sensor of the pressure sensor is provided, and by the said second insufflator which is pierced into the abdominal second pressure sensor is connected, that another second pressure detecting means is constituted from said first pressure sensing means Characterized gas ventilation device. 3. The gas ventilation device according to claim 2, wherein the static pressure values obtained by each of the first pressure detecting means and the second pressure detecting means are compared with each other, and these static pressure values are different from each other. And a comparing means for comparing the two change states to determine which is abnormal. 4. The gas passage device according to claim 1 , wherein the intermittent flow path is provided in the gas supply mode.
In order for the opening / closing means to maintain the open state for a predetermined time or more,
Timing operation starts when the intermittent flow path opening / closing means is opened.
A gas venting device provided with a time measuring means for performing the measurement. 5. An abnormality judging device for judging an abnormality of a gas ventilator for supplying gas such as CO2 gas at a predetermined flow rate into a peritoneal cavity through a pipe-shaped ventilator punctured in the abdomen of a human body or an animal. there are a first pressure sensor for detecting the gas pressure in the gas line, a second pressure sensor for detecting the gas pressure in the abdominal cavity directly, first pressure immediately before interrupting the supply of the gas and the total pressure value detected by the sensor, between a predetermined time after stopping the supply of the gas
Calculated and stored resistance pressure value of the gas line on the basis of the static pressure detected by the first pressure sensor when the have elapsed
Together, the arithmetic circuit and the second pressure and the first static pressure for calculating a first static pressure value by subtracting the resistance pressure value from the output value of the first pressure sensor during supply of the gas A second static pressure value is compared with a second static pressure value obtained by the sensor, and when the first and second static pressure values match , a second static pressure value is output.
When the first and second static pressure values do not match,
Further comparing changes states of the first and second static pressure value, this
When these changing states are synchronized, the second static pressure value is
Output, the first static pressure value changes later than the second static pressure value
When the comparison circuit outputs the first static pressure value, an abnormality is displayed when the comparison circuit outputs the first static pressure value.
Abnormality determination device characterized by comprising a display circuit
Place.