JPH0410812B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an endoscope intrabody cavity pressure adjustment device that is used in an endoscope to adjust the body cavity pressure during observation.

[Prior art] Organs in body cavities, such as the stomach and intestines, generally have a self-contracting habit. Air is pumped through the body, and the pressure is used to inflate the inner walls of the body cavity for observation.

However, if the pressure inside the body cavity becomes too high due to excessive air supply due to cleaning the objective lens surface or due to carelessness on the part of the operator, the inner wall of the body cavity will hyperextend, making it difficult to observe minute changes in the mucous membrane. This may not only make the patient unable to do so, but also cause discomfort to the patient, and in some cases may cause accidents such as damage to the inner wall of the body cavity. Furthermore, when performing endoscopic laser therapy, etc., air is generally continuously supplied into the body cavity, so there is a similar risk.

Conventionally, the pressure inside the body cavity was detected using a pressure sensor, and the operation of a suction device or an air supply device was controlled based on the detected pressure to automatically keep the pressure inside the body cavity constant.

[Problems to be Solved by the Invention] Conventional endoscopic body cavity pressure adjustment devices do not provide a pressure sensor in the insertion section of the endoscope or provide a channel for pressure detection in the insertion section. As a result, the insertion section became thicker, causing great pain to the patient, and the pressure inside the body cavity could not be adjusted without a special endoscope that had a built-in internal pressure adjustment function, so it is not widely used. It has the disadvantage that it cannot be used for general endoscopy because it cannot automatically adjust the pressure inside the body cavity using a conventional endoscope.

In addition, mucus, blood, and other filth from the body cavity may enter the pressure sensor and damage it, or during suction operation, negative pressure that exceeds the withstand pressure value may build up in the pressure sensor, causing damage to the pressure sensor. However, there was a drawback that the device could no longer function properly.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a body cavity pressure adjustment device for an endoscope that can control the body cavity pressure to a constant level without reducing the insertability of a commonly used endoscope. Another object of the present invention is to provide a body cavity pressure adjustment device for an endoscope in which the pressure detection means such as a pressure sensor has excellent durability.

[Means for Solving the Problems] A body cavity pressure adjustment device for an endoscope according to the present invention for solving the above-mentioned problems includes: a suction tube communicating with a conduit opening at the distal end of the insertion portion of the endoscope; a suction means connected to the suction tube; a branch line branched from the suction tube; and a pressure detector provided on the branch line for detecting the pressure within the suction tube. , a valve for opening and closing the branch pipe between the pressure detector and the suction tube, a pressure setting means for setting a reference pressure, an output signal from the pressure detection means, and an output signal from the pressure setting means. The present invention is characterized by comprising a suction control means that controls the operation of the suction means and the operation of the valve in conjunction with each other.

Note that the suction tube may be detachably attached to a conduit opening at the distal end of the insertion portion.

[Operation] The pressure detection means detects the pressure within the suction tube. Since the suction tube communicates with the conduit opening at the distal end of the insertion section, the intra-body cavity pressure is detected via the suction tube and the conduit opening at the distal end of the insertion section. Then, the suction control means controls the operation of the suction means in accordance with the detected pressure, and the internal body cavity pressure is controlled.

A valve that opens and closes the branch pipe leading to the pressure detector is controlled in conjunction with the operation of the suction means, and communication between the pressure detector and the suction tube is opened and closed.

[Example] An example of the present invention will be described based on the drawings.

1 is an insertion part of an endoscope inserted into a body cavity, 2 is an operation part, 3 is a connector connected to an external light source device 4, and inside the light source device 4 is an illumination lamp 5 and an air supply means 6. An air pump is provided.
Illumination light enters the illumination light guide 7 of the endoscope from the illumination lamp 5, and gas such as air is sent from the air supply means 6 to the air supply pipe line 8 inserted into the endoscope. The air supply conduit 8 passes from the connector 3 through the operating section 2 and the insertion section 1 and opens at the distal end of the insertion section, with a switching valve 9 protrudingly inserted into the operating section 2 in the middle. Therefore, with the device of the present invention, an endoscope having one forceps channel can be provided with an automatic adjustment function for body cavity pressure.

This switching valve 9 is a known one, and a detailed explanation will be omitted, but normally, the air supply pipe line 8 communicates with the outside air and the air sent from the air supply means 6 is discharged to the outside, and the switching valve 9 is When pressed with a fingertip, the gap with the outside air is closed and air is supplied into the body cavity through the opening at the tip of the insertion section 1. Note that an electric switch or the like may be provided in place of such a switching valve, and the air supply means may be one that continuously supplies air or one that automatically controls the air supply operation. Good too.

Reference numeral 11 denotes a forceps channel through which a treatment instrument or the like is inserted, the distal end of which is open at the distal end of the insertion section 1, and the proximal end communicated with a forceps insertion port 12 formed at the lower part of the operating section 2. Reference numeral 14 denotes a suction tube made of, for example, polyurethane resin or silicone resin, and is removably connected to the forceps insertion port 12 of the endoscope via a connection mouthpiece 13 that is connected to the mouth of the suction tube. Reference numeral 10 designates a known forceps plug provided in the connection cap 13 and having a structure in which, for example, a slit is formed in a rubber plug, through which treatment tools can be inserted into the forceps channel 11, and the treatment tools can be inserted. It is sealed when not in use.

The suction tube 14 is connected to an external suction means 15, and the forceps channel 11 and the suction tube 14 form a suction channel that opens at the distal end of the insertion section 1. The suction means 15 includes a suction pump 15a, a suction tank 15b that stores the suction material,
It consists of first and second electromagnetic on-off valves 15c and 15d. The first electromagnetic on-off valve 15c is a normally closed type, and the second electromagnetic on-off valve 15d is a normally open type solenoid valve.The first electromagnetic on-off valve 15c is provided with an opening/closing frequency counter 34 that counts the number of openings and closings. ing. The first electromagnetic on-off valve 15c is interposed in the middle of the suction tube 14, and a ventilation pipe 15e is branched from a pipe line halfway between the first electromagnetic on-off valve 15c and the suction tank 15b and is open to the outside air. A second electromagnetic on-off valve 15d is interposed in the middle.

Therefore, in this embodiment, the suction pump 1
5a is operated at all times, and the first electromagnetic on-off valve 1
By closing the valve 5c and opening the second electromagnetic on-off valve 15d, outside air is sucked through the ventilation pipe 15e.
Conversely, while opening the first electromagnetic on-off valve 15c,
By closing the electromagnetic on-off valve 15e, suction is performed only from the suction tube 14, and in this way, the suction operation is controlled by the first and second electromagnetic on-off valves 15c and 15d interlocking.

A branch pipe line 14a is formed in communication with the suction tube 14, and a pressure detector 16 for detecting the pressure inside the suction tube 14 is connected to the branch pipe line 14a.
The pressure inside the body cavity is detected through the suction pipe (suction tube 14, forceps channel 11) and branch pipe 14a if each pipe is not blocked. A indicates a branch. Also,
A second air supply means 17 for supplying air into the suction tube 14 is provided in the middle of the branch pipe line 14a, close to the pressure detector 16. This second air supply means 17 is, for example, a small air supply pump, and a small amount (for example, 30 to
70ml) of air is supplied continuously or intermittently.

Further, a normally open third electromagnetic on-off valve 18 for opening and closing the pipe is provided near the branch A of the branch pipe 14a, and the electromagnetic on-off valve 18 and the pressure detector 16
A three-way electromagnetic on-off valve 19 for pipe switching is provided between the two. This three-way electromagnetic on-off valve 19 is connected to a water flow tube 21 that communicates with a water tank 20 storing cleaning water, etc., and by switching the three-way electromagnetic on-off valve 19, water is sucked through the branch pipe 14a. The pipe line 11 and the pressure detector 16 communicate with each other, or the suction pipe line 11 and the water passage tube 21 communicate with each other.

22 is a setting means for setting the intra-body cavity pressure desired by the operator, setting the mode of internal pressure adjustment, etc.;
pressure display means for displaying detected body cavity internal pressure, etc.;
24 is an alarm means that issues an alarm in the event of an abnormality;
These will be explained with reference to FIG. 3 showing the external appearance of the device.

In FIG. 3, reference numeral 22a is a pressure setting switch for setting the intra-body cavity pressure desired by the operator; pressing one of the two buttons increases the set pressure, and pressing the other button decreases the set pressure. Furthermore, this pressure switch 22
A foot-operated foot switch (not shown) may also be provided with a switch having the same function as a. The set pressure set here is displayed on the set pressure display 22b.

22c turns on the automatic adjustment function of body cavity pressure.
This is a switch that is turned OFF. When turned ON, the pressure inside the body cavity is automatically adjusted; when turned OFF, the pressure inside the body cavity is not automatically adjusted, and only the pressure detected by the pressure detector 16 is displayed. 22d is a suction mode setting switch that sets the time for one suction to adjust the body cavity pressure. The setting contents (low, auto, high) are displayed on the mode display lamp 22.
It is displayed on e. 22f is a three-way electromagnetic on-off valve 1
9 is a suction switch that selects the state of suction from the water tube 21. Setting means 22 is constituted by these switches 22a to 22f.

23a and 23b are pressure display means 23 for displaying the pressure detected by the pressure detector 16, 23a is a digital display for digital display, and 23b is a bar graph for analog display. 24a is a warning lamp, and this lamp 24
An alarm buzzer (not shown) that operates in conjunction with a is built into the device.

In FIG. 1, 25 is a microcomputer, which is composed of an input/output interface 25a, a central processing unit (CPU) 25b, and a memory 25c. The input terminal of the input/output interface 25a is connected to the output line of the setting means 22 and the A/D converter 2.
6, the output line of the pressure detector 16 and the output line of the opening/closing number counter 34 are connected. In addition, to the output terminal of the input/output interface 25a, each electromagnetic on-off valve 15c, 15d, 18, 19 is connected via drive circuits 27-30, and the air supply means 1 is connected via drive circuits 31-33.
7. Pressure display means 23 and alarm means 24 are connected.

Next, the operation of the above embodiment will be explained.

After inserting the insertion section 1 of the endoscope into the patient's body cavity, air is sent into the body cavity from the air supply means 6 in the light source device 4 by manually operating the switching valve 9 of the operation section 2. , the intrabody pressure increases.

In order to automatically control the internal pressure of the body cavity below an arbitrary set pressure, a connection cap 13 of an internal pressure adjusting device is connected to the forceps insertion port 12 of the endoscope. Even in this state, the treatment instrument can be inserted into the forceps channel 11 through the forceps plug 10 and used freely. Then, turn the automatic adjustment ON-OFF switch 22c.
Set it to ON and use the pressure setting switch 22a to set the pressure that is considered most appropriate for the test. The pressure is displayed on the set pressure display 22b.

In the normal state where the suction switch 22f is turned off, the first electromagnetic on-off valve 15c is closed, the second electromagnetic on-off valve 15d and the third electromagnetic on-off valve 18 are open, and the three-way electromagnetic on-off valve 19 is open. connects the branch pipe line 14a to the pressure detector 16. Therefore, the pressure detector 16 detects the intra-body cavity pressure via the suction tube 14 etc., and its output signal is converted into a digital signal via the A/D converter 26 and input to the input/output interface 25a. , the output signal from the input/output interface 25a is sent to the drive circuit 3.
2 to the display means 23 (digital display 23a
The bar graph 23b) displays the intra-body cavity pressure. The digital display 23a normally displays the detected pressure detected by the pressure detector 16 in real time, and the microcomputer 25
When the display is processed to prohibit interruptions, the immediately previous display state is maintained. In this device, when the suction means 15 is in operation, the pressure value detected immediately before the start of the suction operation is displayed until the end of the suction operation. Therefore, the display does not display a pressure that is far from the actual intra-body cavity pressure.

Further, since the first electromagnetic on-off valve 15c is normally closed, the suction means 15 does not communicate with the suction tube 14 and only sucks atmospheric air through the ventilation pipe 15e. The second air supply means 17 supplies a small amount of air into the branch pipe 14a.

The CPU 25b compares the set pressure set by the setting means 22 and the detected pressure detected by the pressure detector 16, and when the detected pressure is higher than the set pressure, the output signal of the input/output interface 25a is displayed on the digital display. In addition to disabling the display of 23a and fixing it to the immediately previous display value,
The air supply from the second air supply means 17 is stopped, the second and third electromagnetic on-off valves 15d and 18 are closed, and the first electromagnetic on-off valve 15c is opened. After a certain period of time, everything returns to its normal state.

Therefore, during the certain period of time, the suction tube 14 communicates with the suction means 15, and the air in the body cavity is suctioned through the forceps channel 11 to reduce the pressure. A certain period of time during which this suction (depressurization) operation is performed is stored in the memory 25c of the microcomputer, and is controlled by an input signal from the suction mode setting switch 22d to the input/output interface 25a.
The suction operation time is different. That is, when the suction mode setting is high mode, the decompression operation is performed for 1 second, and when the suction mode setting is low mode, the decompression operation is performed for 0.2 seconds. Therefore, in situations where the amount of air in the body cavity changes only by a small amount, the time for one operation should be set short, and in situations where air is constantly being pumped into the body cavity, the time for one operation should be set short. can be set for a long time.

In addition, when the suction mode setting is auto mode, when the set pressure is less than 10 mmHg, it is 0.3 seconds, and when the set pressure is between 10 mmHg and 15 mmHg, it is 0.5 seconds.
When the set pressure exceeds 15mmHg, a 0.7 second decompression operation is performed. Therefore, one of the suction means
The amount of suction by each operation is automatically adjusted to the optimal amount according to the set pressure, and the body cavity pressure can always be kept stable and constant regardless of the level of the body cavity pressure that is set. In this way, the apparatus of this embodiment can select the most appropriate mode depending on the situation of the endoscopy.

If the forceps channel 11 or the suction tube 14 is clogged with mucus, dirt, etc., the pressure detector 16 will no longer detect the pressure inside the body cavity. However, if the suction tube 14 etc. become clogged, the second air supply means 17
The pressure inside the tube increases due to a small amount of air discharged into the branch pipe 14a, so the pressure is detected by the pressure detector 16 and the above-mentioned suction (depressurization) operation is performed, causing the suction tube 14 to become clogged. The accumulated mucus and the like are suctioned and removed by the suction means 15. Also. At the same time, the third electromagnetic on-off valve 18 closes. Therefore, mucus and the like moving inside the suction tube 14 do not enter the pressure detector 16 side, and the pressure detector 16 is not affected by negative pressure due to suction, so the pressure detector 16 does not deteriorate. Long life can be obtained.

However, as shown in FIG. 4, mucus, etc. accumulates in the downwardly bent portion of the suction tube 14, and the mucus cannot be removed from the bent portion of the tube with one suction (decompression) operation. Once this is completed, the mucus may return to the bottom of the bent part of the tube. In such a case, the pressure detector 16 will be at atmospheric pressure (0 mmHg) immediately after the suction operation is completed.
or lower pressure is detected. At that time, the input/output interface 25 of the microcomputer
In response to the output signal from a, the digital display 23a of the display means displays a display unrelated to the pressure value (for example, "EE"), indicating that the displayed value is not the intracavity pressure. Therefore, the operator can know the situation and take appropriate measures.

At the same time, the suction operation is repeated due to an increase in the pressure inside the pipe due to the air supplied from the second air supply means 17, and while the suction operation is repeated three times, the pressure detector 1
When atmospheric pressure or lower pressure is continuously detected in step 6, the suction operation is performed continuously for a long time (for example, 1.5 seconds) according to the output signal from the input/output interface 25a of the microcomputer.
Mucus, etc. clogged in the bent portion of the suction pipe is automatically suctioned and discharged. If the detected pressure exceeds atmospheric pressure, both the display and the suction operation time return to their normal state.

If too much air is being supplied into the body cavity and the suction operation of this device is not enough to reduce the pressure in time, an alarm will be issued. That is, when the pressure detected by the pressure detection means 16 exceeds a predetermined pressure (for example, 20 mmHg) a predetermined number of times (for example, three times) in succession, the alarm lamp 24a is turned on by an output signal from the input/output interface 25a of the microcomputer. At the same time, the alarm buzzer sounds.

In this way, an alarm is issued only when the detected pressure is still high after the suction means has operated multiple times in succession, so an alarm is issued accurately only when the intrabody cavity pressure is in a truly abnormal high pressure state. . If the detected pressure falls below a predetermined pressure, the alarm will stop. still,
When the automatic adjustment switch 22c is OFF, an alarm is issued when the detected pressure exceeds a predetermined pressure for, for example, two seconds or more continuously.

When cleaning the inside of the suction tube 14 and the branch pipe line 14a after the endoscopic examination, remove the connection cap 13 of the suction tube from the forceps insertion port 12 of the endoscope and place it in the cleaning liquid in the water tank 20. The tip of the water tube 21 is also placed in the cleaning liquid in the water tank 20. Then, when the suction switch 22f is turned on, the digital display 23a switches to a display such as "--" by the output from the input/output interface 25a, and the first and third electromagnetic on-off valves 15c, 18 are switched on. The second electromagnetic on-off valve 15 is opened.
d is closed. And 3-way electromagnetic on-off valve 19
However, for example, water is passed through tube 2 only twice at 0.5 second intervals.
1 side, and the suction tube 14 and the water passage tube 21 communicate with each other via the branch pipe 14a.
Then, since the suction tube 14 is longer than the water passage tube 21 and the resistance inside the pipe is greater, while the three-way electromagnetic on-off valve 19 is open to the water passage tube 21 side, there is no flow from the water passage tube 21 into the water tank 20. The cleaning liquid is sucked and the inside of the branch pipe 14a is cleaned.

Therefore, there are no sanitary problems caused by blockages in the branch pipes or filth that adheres to the branch pipes.
The device can always be used normally and safely.

When the water passage tube 21 side is closed, the cleaning liquid is sucked from the suction tube 14 and the inside of the suction tube 14 is cleaned.

Note that the suction tube 14 and the tubes near the electromagnetic on-off valves of the branch pipe 14a deteriorate due to repeated suction operations, that is, repeated opening and closing operations of the electromagnetic valves. It is now possible to notify by warning. That is, the output signal from the opening/closing frequency counter 34 is input to the input/output interface 25a of the microcomputer, and when the opening/closing operation of the first electromagnetic valve 15c reaches, for example, 200,000 times, the output signal from the input/output interface 25a is input to the input/output interface 25a of the microcomputer. The alarm lamp 24a is activated by the output signal of
lights up.

5 to 8 are flowcharts showing programs stored in the memory 25c of the microcomputer 25, and s in the figures indicates a step.

In Figures 5 to 7, the suction switch is OFF.
This is a program that is executed in the case of , and if the suction does not operate in the middle, it is executed on average about 1000 cycles per second.

First, in s1, counters m, n and flag f are initialized, for example, m=2000, n=3, f=0. Next, in s2, the detected pressure (P) from the pressure detector is read, in s3, the detected pressure is displayed on a bar graph, and in s4, the digital display is allowed to interrupt the display.

Then, in s5, the opening/closing frequency counter of the first electromagnetic on-off valve is read, and in s6, it is determined whether the number of opening/closing counters has reached the number of tube replacements (for example, 200,000 times), and if the number of replacements has been reached. If so, turn on the warning lamp in s7 and proceed to s9. If the opening/closing count counter does not reach the number of tube replacements in s6, turn off the warning lamp in s8 and proceed to s9.

Next, in s9, it is determined whether the detected pressure P exceeds 20 mmHg, and if it exceeds 20 mmHg,
In s10, set the overpressure detection counter m to m=m-1,
If m=0 in s11, turn on the alarm lamp and alarm buzzer in s12 and proceed to s15. If m is not 0 in s11, proceed directly to s15. In addition, if the detected pressure does not exceed 20 mmHg in s9, the alarm lamp and alarm buzzer are turned off in s13, and in s14, the excessive pressure detection counter m and the excessive pressure detection counter flag f are set to the initial value (m = 2000). , f=0) and proceed to s15.

In s15, the status of the pressure setting switch and other switches is read, in s16 the status of the automatic adjustment switch is determined, and when automatic adjustment is OFF, the process returns to s2.
When automatic adjustment is ON, it is determined in s17 whether the detected pressure P is less than the set pressure _P0 , and if the detected pressure P is not less than the set pressure _P0 , the display on the digital display is divided in s18. The display state is locked as prohibited, and in step s19, the suction operation time is selected from a table stored in the memory (ROM) according to the states of the mode setting switch and the pressure setting switch.

FIG. 9 shows the table, in which the suction time is given depending on the set pressure and set mode. In this table, in high mode, 1
seconds, low mode gives a constant suction time of 0.2 seconds, and auto mode, the set pressure is 10mmHg
0.3 seconds if it is less than 15mmHg, 0.7 seconds if it exceeds 15mmHg,
At 10-15 mmHg, a suction time of 0.5 seconds is given.

Next, in s20, the first to third electromagnetic on-off valves are set to the suction (pressure reduction) state. That is, the first electromagnetic on-off valve is opened, and the second and third electromagnetic on-off valves are closed.
Then, in s21, subtract the suction operation time, and in s22, if the remaining suction operation time is not 0, return to s21, and in s22
When the remaining suction operation time reaches 0 in s23, the first
~ Return the third electromagnetic on-off valve to its original normal state,
Release the display interrupt prohibition of the digital display in s24, and s25
Proceed to.

In s25, the overpressure detection counter flag is set to f.
= 0, set the overpressure detection counter m to m = 3 in s26, set a flag in s27, and
=1), proceed to s28. If the detected pressure P is less than or equal to the set pressure P ₀ in s17, the process proceeds directly from s17 to s28 if the detected pressure P is less than or equal to the set pressure P ₀ .

In s28, the detected pressure P from the pressure detector is read, and in s29, it is determined whether the detected pressure P is 0 mmHg or less. And the detected pressure P is 0mm
When the temperature is below Hg, in s30 the digital display is set to "EE" and its display state is locked, in s31 the blockage detection counter n is set to n=n-1, and in s32
If n=0, return to s2, if n=0, s33
suction (depressurize) the first to third solenoid on-off valves for 1.5 seconds with
Switch to state. Then, in s34, n is reset to n=3 and the process returns to s2. Also, when s=29 and the detected pressure is not below 0 mmHg, set n to n= in s35.
3, cancel the display interrupt prohibition of the digital display in s36, and return to s2.

FIG. 8 is a flowchart showing a program executed when the suction switch is ON. First, in s51, a counter i is initialized and i=2. Next, in s52, the display state of the digital display is set to, for example, "--" and the display state is locked, and in s53
The first to third electromagnetic on-off valves are brought into the suction state. If i is not 0 in s54, then in s55, open the 3-way electromagnetic opening/closing valve for 0.5 seconds toward the water passage tube to connect the water passage tube and the suction tube, and after 0.5 seconds have elapsed, the 3-way electromagnetic opening/closing valve opens/closes for 0.5 seconds. When the valve returns to its original state, set the counter i to i=i-1 in s56, and set the counter i to i=i-1 in s57.
Wait 0.5 seconds and return to s54. When i=0 in s54,
Proceed directly to s57 and return to s54 again.

FIG. 10 is a graph showing data obtained by measuring the state of body cavity pressure using the device of this embodiment in clinical practice.

A, B, and C in Figure 10 indicate the set pressure, respectively.
This shows the state of the body cavity pressure when it is set to 10, 15, and 20 mmHg, and both 2 and 5 show the state where the body cavity pressure increases momentarily due to burping. As can be seen from this data, the device of this embodiment can maintain the intra-body cavity pressure at a constant level extremely accurately during endoscopy.

[Effects of the Invention] According to the endoscopic body cavity pressure adjustment device of the present invention,
Since the device of the present invention can be used by connecting it to an endoscope that has a conduit opening at the tip of the insertion section, there is no need to add any structure to the insertion section of the endoscope, and therefore, the endoscope can be easily It maintains normal insertion of the speculum and does not cause any unnecessary pain to the patient. Moreover, if the endoscope has one channel that opens at the tip of the insertion tube, an automatic adjustment function for body cavity pressure can be added, and it has excellent effects that can be used in a wide range of general endoscopy examinations. .

In addition, a pressure detector is installed in a branch line that branches from the suction tube that communicates with the tip of the insertion tube, and a valve that opens and closes the branch line is installed between the pressure detector and the suction tube, and the operation of the valve is monitored for suction. By controlling in conjunction with the operation of the means,
Since it is possible to prevent dirt from being applied to the pressure sensor or negative pressure due to suction from being applied to the pressure sensor, there is no fear that the pressure sensor will be damaged, and excellent durability can be obtained.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the configuration of the present invention, Figure 2 is a block diagram showing the configuration of the present invention.
The figure is a block diagram of an embodiment of the present invention, FIG. 3 is a perspective view of the external appearance of the device of the embodiment, FIG. 4 is a schematic external view of the suction tube in a state in which it is bent downward, and FIG.
8 through 8 are flowcharts showing programs stored in the memory of a microcomputer;
FIG. 9 is a chart showing a table similarly stored in the memory, and FIG. 10 is a graph showing the experimental results of measuring the state of adjustment of the body cavity pressure by the apparatus of the embodiment.

Claims (1)

[Scope of Claims] 1. A suction tube communicating with a conduit opening at the tip of the insertion portion of the endoscope, a suction means connected in communication with the suction tube, and a branch provided branching off from the suction tube. a pipe line, a pressure detector provided in the branch pipe line for detecting the pressure in the suction tube, and a valve that opens and closes the branch pipe line between the pressure detector and the suction tube; a pressure setting means for setting a reference pressure; and a suction that controls the operation of the suction means and the valve in conjunction with each other by comparing an output signal from the pressure detection means with an output signal from the pressure setting means. 1. A body cavity pressure adjustment device for an endoscope, comprising a control means. 2. The body cavity pressure adjustment device for an endoscope according to claim 1, wherein the suction tube is detachably attached to a conduit opening at the distal end of the insertion section.