JP6132657B2 - Air supply device - Google Patents

Description

  The present invention relates to an air supply device.

  2. Description of the Related Art Conventionally, in order to secure a field of view of an endoscope and a treatment space, an air supply device that sends gas into a body cavity and expands the body cavity is known (see, for example, Patent Documents 1 and 2). The devices described in Patent Documents 1 and 2 repeat the supply and stop of the gas so that the pressure in the body cavity becomes a predetermined value, while the patient's biological information such as the end expiratory carbon dioxide partial pressure, blood pressure, heart rate, etc. The gas delivery rate is adjusted based on the change.

JP 2006-61702 A JP 2006-167122 A

  However, in the devices described in Patent Documents 1 and 2, when the gas leaks from the inside of the desired body cavity to the outside, the operator notices that the pressure rise in the body cavity is slow, or the gas leaks. The gas supply into the body cavity is continued until the influence of the above appears in the biological information. In particular, since the volume of the pericardial cavity is small, finer air supply control is required when air is supplied into the pericardial cavity than when air is supplied to the abdominal cavity. For this reason, it is desired to detect gas leakage or sufficient gas supply more quickly and stop the gas supply earlier.

  The present invention has been made in view of the above-described circumstances, and promptly detects a leak of gas from the inside of a desired body cavity to the outside and supply of a sufficient amount of gas into the desired body cavity. Then, it aims at providing the air supply apparatus which can stop supply of gas at an early stage.

In order to achieve the above object, the present invention provides the following means.
According to a first aspect of the present invention, there is provided an insufflation means for sending a gas into a body cavity of a living body, a body cavity pressure measuring unit for measuring a pressure in the body cavity , a blood pressure measuring unit for measuring a blood pressure of the body, and the body cavity together with the first amount of change per unit time of the pressure in the body cavity measured by pressure measuring unit determines whether less than a first predetermined range, has been a blood pressure measurement by the blood pressure measuring portion the second variation is a determination section for determining whether or not it is within a second predetermined range per unit time, the determination unit by, the first amount of change of the first pressure in said body cavity small and come to have been determined than the predetermined range, and, at least when one of the air supply means when said second amount of change in the blood pressure is determined to deviate from the second predetermined range A control unit for stopping air supply into the body cavity by It is obtain the gas supply apparatus.
According to a second aspect of the present invention, there is provided an insufflation means for sending a gas into a body cavity of a living body, a body cavity pressure measuring unit for measuring a pressure in the body cavity, a blood pressure measuring unit for measuring a blood pressure of the living body, and the body cavity It is determined whether the first change amount per unit time of the pressure in the body cavity measured by the internal pressure measurement unit is smaller than a first predetermined range, and the blood pressure measured by the blood pressure measurement unit is When it is determined by the determination unit that determines whether or not it is within a third predetermined range, and the determination unit determines that the first change amount of the pressure in the body cavity is smaller than the predetermined range, And an air supply device comprising: a control unit that stops air supply into the body cavity by the air supply means when at least one of the blood pressure is determined to be out of the third predetermined range. is there.

  According to the present invention, the pressure in the body cavity is measured by the body cavity pressure measuring unit while the air is being fed into the body cavity by the air feeding means, and the change amount of the measured pressure per unit time is within a predetermined range. It is monitored whether there is, i.e., whether the pressure in the body cavity is normally rising according to the air supply.

  In this case, when the gas leaks from the inside of the desired body cavity to the outside, the pressure in the desired body cavity does not rise with a sufficient amount of change even if the air supply is started. Therefore, immediately after the start of air supply, the determination unit determines that the amount of change in the pressure is smaller than a predetermined range. Thereby, the control part can detect the leak of the gas from the inside of a desired body cavity to the exterior rapidly, and can stop the further air supply. Furthermore, the control unit can detect that a sufficient amount of gas has been supplied into the desired body cavity and can stop further air supply.

In the above invention, the determination unit further determines whether or not the pressure in the body cavity measured by the body cavity pressure measurement unit is within a fourth predetermined range, and the control unit performs the determination the parts, when the first change amount of pressure in the body cavity is determined to be smaller than the first predetermined range, and the pressure in the body cavity is disengaged from the fourth predetermined range The air supply to the body cavity by the air supply means may be stopped at at least one of the times when it is determined that the air supply has occurred.
In this way, in addition to gas leakage and supply of a sufficient amount of gas into the body cavity, it is quickly determined that the pressure in the body cavity has become excessively high based on the pressure in the body cavity. It can detect and stop further air supply.

In the above SL first aspect bright, it includes a blood pressure measurement unit for measuring blood pressure of said living body, wherein the determination unit includes first per unit time of the pressure in the body cavity measured by the intracorporeal pressure measurement section the amount of change is with determining whether smaller than the first predetermined range, the second amount of change per unit time of the blood pressure measured by the front Symbol blood pressure measurement unit is within a second predetermined range whether determined, the control unit, by the determination unit, when the first change amount of pressure in the body cavity is determined to be smaller than the first predetermined range, and the blood pressure when the second change amount of at least one of when it is determined that deviates from the second predetermined range, Ru stops the air supply to the body cavity by the air supply means.
In this way, in addition to gas leakage and a sufficient amount of gas being supplied into the body cavity, it is difficult to expand the pericardial cavity, particularly when delivering to the pericardial cavity. It is possible to detect quickly based on the amount of change in blood pressure and stop further air supply.

In the above SL second aspect, it includes a blood pressure measurement unit for measuring blood pressure of said living body, wherein the determination unit includes first change per unit time of the pressure in the body cavity measured by the intracorporeal pressure measurement section Determining whether the amount is smaller than a first predetermined range, determining whether the blood pressure measured by the blood pressure measurement unit is within a third predetermined range, the control unit, by the determination unit, when the first change amount of pressure in the body cavity is determined to be smaller than the first predetermined range, and, determines that the blood pressure is out of the third predetermined range when at least one of when, Ru stops the air supply to the body cavity by the air supply means.
In this way, in addition to gas leakage and the supply of a sufficient amount of gas into the body cavity, especially when feeding into the pericardial cavity, feeding into the pericardial cavity causes the heart to be ventilated. It is possible to quickly detect that an influence is exerted based on the blood pressure, and to stop further air supply.

Further, in the above invention, the apparatus further comprises a total air supply measurement unit that measures the total gas supply amount after the gas supply unit starts the gas supply, and the determination unit further includes: It is determined whether or not the total air supply amount measured by the total air supply amount measuring unit is within a fifth predetermined range, and the control unit is configured to determine the pressure of the body cavity by the determination unit . When it is determined that the amount of change in 1 is smaller than the first predetermined range , and at least one of when it is determined that the total air supply amount is out of the fifth predetermined range , Air supply into the body cavity by the air supply means may be stopped.
In this way, in addition to gas leakage and supply of a sufficient amount of gas into the body cavity, it is quickly detected that the desired body cavity has been sufficiently expanded based on the total amount of air delivered. You can stop further airing.

  According to the present invention, it is possible to quickly detect gas leakage from the inside of a desired body cavity to the outside and that a sufficient amount of gas has been supplied into the desired body cavity, and stop the gas supply at an early stage. There is an effect that can be.

1 is an overall configuration diagram of an air supply device according to an embodiment of the present invention. It is a graph which shows the time change of (a) pericardial cavity pressure and (b) blood pressure which are acquired by a memory | storage part. 3 is a table showing correspondence between a desired change in body cavity pressure and a change in blood pressure and a determination result by a control unit in the air supply abnormality determination method by the air supply device of FIG. 1. (A) Normal, (b) Abnormal A occurrence, (c) Abnormal B occurrence, and (d) Abnormal C occurrence, change in pericardial pressure (upper stage), change in blood pressure ( It is a graph which shows the time change of an intrapericardial pressure and a blood pressure (lower stage). It is a flowchart which shows operation | movement of the air_supply apparatus of FIG. FIG. 6 is a table showing the correspondence between the amount of change in pericardial pressure and the amount of change in blood pressure and the determination result in another air supply abnormality determination method by the air supply device of FIG. 1. 6 is a graph showing changes in pericardial pressure (upper), changes in blood pressure (middle), and changes over time in pericardial pressure and blood pressure (lower) when an abnormality D occurs. FIG. 6 is a table showing a correspondence between an amount of change in pericardial pressure and a blood pressure and a determination result in the air supply abnormality determination method according to the first modification of the air supply device of FIG. 1. FIG. 10 is a table showing a change in pericardial pressure and a correspondence between pericardial pressure and a determination result in the air supply abnormality determination method according to the second modification of the air supply device of FIG. 1. It is a whole block diagram of the 3rd modification of the air_supply apparatus of FIG. 11 is a table showing the correspondence between the amount of change in pericardial cavity pressure and the total amount of air supply and the determination result in the air supply abnormality determination method of the air supply device of FIG. 10.

Hereinafter, an air supply device 1 according to an embodiment of the present invention will be described with reference to the drawings.
In the present embodiment, a case where gas is supplied to the pericardial space Y in the living body X to expand the pericardial space Y will be described as an example. However, the air supply device 1 according to the present embodiment includes: The present invention can also be applied to expansion of a body cavity other than the pericardial cavity Y.

  As shown in FIG. 1, the air supply device 1 according to the present embodiment includes a gas supply source 2, a tube (air supply means) 3 inserted into the pericardial space Y, a gas supply source 2, and a tube 3. And a pressure sensor (internal cavity pressure measuring unit) 5 for measuring pressure in the pericardial cavity Y (hereinafter also referred to as intrapericardial pressure). A blood pressure sensor (blood pressure measurement unit) 6 that measures the blood pressure of the living body X, a central processing unit (CPU) 7 that controls the air supply amount adjustment unit 4, and a notification unit 15 that notifies an abnormality in the air supply state It has.

The gas supply source 2 contains a gas such as carbon dioxide in a high pressure state.
The air supply amount adjusting unit 4 adjusts the amount of gas supplied from the gas supply source 2 to the tube 3, and includes a decompressor 8 that decompresses the gas discharged from the gas supply source 2, and the decompressor 8. A pressure regulator 9 such as an electropneumatic proportional valve that regulates the pressure of the gas decompressed by the pressure, and an on-off valve 10 connected between the pressure regulator 9 and the tube 3.

The pressure sensor 5 measures the pressure in the tube 3 communicating with the inside of the pericardial space Y as the pericardial pressure in the middle position of the tube 3, and transmits the measured pericardial pressure to the CPU 7.
The blood pressure sensor 6 is attached to the living body X, measures the blood pressure of the living body X, and transmits the measured blood pressure to the CPU 7.

  The CPU 7 stores the values of the pericardial pressure and blood pressure received from the pressure sensor 5 and the blood pressure sensor 6, and the amount of change per unit time of the pericardial pressure and blood pressure (hereinafter simply referred to as “change amount”). ”) And a control unit (determination unit) 13 that controls the air supply amount adjustment unit 4 based on the amount of change calculated by the calculation unit 12.

The storage unit 11 stores the pericardial pressure and blood pressure in time series. As a result, changes in pericardial pressure and blood pressure over time are acquired.
The computing unit 12 calculates the changes in the pericardial pressure and blood pressure from the temporal changes in the pericardial pressure and blood pressure stored in the storage unit 11, and outputs the calculated changes to the control unit 13.

  Here, the time change of the pericardial cavity pressure acquired in the storage unit 11 becomes a waveform that periodically changes in synchronization with the heartbeat and respiration as shown in FIG. As shown in FIG. 2B, the waveform changes periodically in synchronization with the heartbeat. Therefore, the calculation unit 12 calculates the fluctuation centers (offset values) of the amplitudes of the pericardial pressure and blood pressure as the representative values P and S of the pericardial pressure and blood pressure, respectively. The amount of change per unit time is calculated as the amount of change ΔP, ΔS in the pericardial pressure and blood pressure. Hereinafter, the representative values P and S of intrapericardial pressure and blood pressure are referred to as pericardial pressure P and blood pressure S.

  Note that the calculation unit 12 treats the maximum or minimum values of the pericardial pressure and blood pressure within one cycle as representative values P and S instead of the offset value, and changes in the representative values P and S per unit time. The amount may be calculated as change amounts ΔP and ΔS.

  The control unit 13 holds predetermined thresholds a and b set for the change amounts ΔP and ΔS. The threshold value a is the lower limit value of the normal range of the change amount ΔP of the pericardial pressure P, and the threshold value b is the lower limit value of the normal range of the change amount ΔS of the blood pressure S. After the control unit 13 opens the on-off valve 10 and starts supplying gas from the gas supply source 2 into the pericardial cavity Y, the two changes ΔP and ΔS received from the calculation unit 12 are within the normal range. Monitor whether there is. Then, when at least one of the two variations ΔP and ΔS is out of the normal range, the control unit 13 stops the air supply by closing the on-off valve 10 and sets the two variations ΔP and ΔS. Based on this, the cause of the abnormal air supply is determined, and the determination result is notified to the operator by the notification unit 15 using, for example, a panel display or sound.

Next, an air supply abnormality determination method by the control unit 13 will be described with reference to FIGS. 3 and 4.
The control unit 13 determines that the air is normally supplied when the change amount ΔP of the pericardial pressure P is equal to or greater than the threshold value a and the change amount ΔS of the blood pressure S is equal to or greater than the threshold value b. That is, when the air supply to the pericardial space Y is normally performed, as shown in FIG. 4A, the pericardial pressure P increases with time and the pressure acting on the heart. As blood pressure increases, the blood pressure S decreases with time.

  On the other hand, the control unit 13 is in a state in which the pericardium is difficult to expand when the change amount ΔP of the pericardial pressure P is equal to or greater than the threshold value a and the change amount ΔS of the blood pressure S is smaller than the threshold value b ( It is determined that abnormality A). That is, when the pericardium is hardened due to adhesion or calcification with surrounding organs due to pericarditis, for example, as shown in FIG. As the pericardial pressure P increases steeply, the pressure acting on the heart increases and the blood pressure S decreases sharply.

  On the other hand, when the change amount ΔP of the pericardial pressure P is smaller than the threshold value a, the control unit 13 is in the early stage after the start of air supply (for example, the air supply time is equal to or less than the predetermined threshold value g). If it is determined that gas leaks from the membrane cavity Y (abnormal B) and a sufficient time has elapsed after the start of air supply (for example, the air supply time is greater than a predetermined threshold value g) It is determined that the total amount of gas supplied into the pericardial cavity Y is excessive (abnormal C). That is, when gas leaks from the inside of the pericardial space Y to the outside, as shown in FIG. 4C, the increase in the pericardial pressure P and the blood pressure S at an earlier stage as compared with the normal time. The decline is moderate. On the other hand, when further insufflation is performed with the pericardium already sufficiently expanded, as shown in the frame in FIG. 4 (d), compared to the early stage after the start of insufflation, The increase in the intramembrane pressure P is moderated.

Next, the operation of the air feeding device 1 configured as described above will be described with reference to FIG.
In order to expand the pericardial space Y using the air supply device 1 according to the present embodiment, the operator inserts the distal end of the tube 3 into the pericardial space Y and attaches the blood pressure sensor 6 to the living body X. Then, the operator causes the air supply device 1 to start an air supply operation by operating a switch (not shown), for example.

  The insufflation device 1 first measures the pericardial pressure P and the blood pressure S (step S1), and then opens the on-off valve 10 (step S2), and then opens the heart from the gas supply source 2 through the tube 3. Air supply into the membrane cavity Y is started. After the start of air supply, the air supply device 1 performs air supply while monitoring the change amount ΔP of the pericardial pressure P and the change amount ΔS of the blood pressure S (steps S3 and S4).

  When the pericardium is normally expanded by gas supply into the pericardial space Y (YES in step S5, YES in step S6), the air supply device 1 supplies air until the pericardium is sufficiently expanded. Subsequently, when the pericardium is sufficiently expanded (NO in step S5, NO in step S7), an abnormality C is detected (step S8), and air supply is terminated (step S12).

  On the other hand, when the pericardium is difficult to expand due to adhesion or calcification (YES in step S5, NO in step S6), the air supply device 1 detects abnormality A (step S9) and stops air supply. (Step S12). On the other hand, when gas leaks from the inside of the pericardium to the outside due to a hole in the pericardium (NO in step S5, YES in step S7), the air supply device 1 detects abnormality B. (Step S10) Air supply is stopped (Step S12). When the air supply device 1 stops air supply by detecting the abnormalities A to C, the notification unit 15 notifies the operator of the contents of the abnormalities A to C (step S11).

  In this case, according to the present embodiment, when it is difficult to normally expand the pericardial space Y due to an abnormality on the living body X side, such as the pericardium being hardened or a hole in the pericardium. In addition, after the start of air supply, this is quickly detected as an abnormality in the change amount ΔP of the pericardial pressure P or the change amount ΔS of the blood pressure S. Thus, there is an advantage that the air supply can be stopped at an early stage after the start of the air supply, and unnecessary gas supply to the pericardial space Y can be prevented.

  Since the volume of the pericardial space Y and the hardness of the pericardium vary among individuals, the total amount of gas necessary to sufficiently expand the pericardial space Y varies depending on the individual. It is difficult to determine whether or not a sufficient amount of gas has been supplied from the measured value of P itself. According to this embodiment, the pericardial pressure P decreases from the decrease ΔP in the pericardial pressure P due to the saturation of the pericardial pressure P by continuing the air supply, regardless of such individual differences. There is an advantage that it is possible to quickly detect that a sufficient amount of gas has been supplied into the cavity Y.

  Furthermore, since the blood pressure S at normal time varies among individuals, it is difficult to accurately determine the influence of the gas in the pericardial space Y on the heart from the measured value of the blood pressure S itself. In particular, it is difficult to detect a decrease in blood pressure S within the normal range with high sensitivity if only the measured value of blood pressure S is monitored. On the other hand, according to the present embodiment, there is an advantage that the influence of the gas in the pericardial cavity Y on the heart can be detected with high sensitivity from the change amount ΔS of the blood pressure S.

  In the present embodiment, the predetermined threshold value a or more is set to the normal range of the change amount ΔP of the pericardial pressure P. Instead of this, as shown in FIG. A predetermined threshold value c larger than the threshold value a, that is, an upper limit value of the normal range of the change amount ΔP may be set, and the abnormality D may be determined in addition to the three types of abnormalities A to C described above.

  Specifically, the control unit 13 detects an abnormality on the air supply device 1 side when the change amount ΔP of the pericardial pressure P is larger than the threshold value c and the change amount ΔS of the blood pressure S is equal to or more than the threshold value b. It is determined that there is (abnormal D). That is, when the gas is supplied from the gas supply source 2 to the tube 3 but the gas is not supplied into the pericardial space Y because the middle position of the tube 3 is clogged, FIG. As shown, the increase in the pericardial pressure P becomes sharper and the decrease in the blood pressure S becomes slower than in the normal state.

In this modification, the control unit 13 is the same as the above-described embodiment except that the range of the change amount ΔP of the pericardial pressure P when determining normality and abnormality A is not less than the threshold value a and not more than the threshold value c. Normal and abnormal AC are determined.
By doing in this way, the cause of abnormality of air supply operation | movement can be specified in detail.

  In the present embodiment, the control unit 13 determines the quality of the air supply operation using the change amount ΔP of the pericardial pressure P and the change amount ΔS of the blood pressure S. In order to detect gas leakage from the inside to the outside of the pericardial space Y at an early stage, at least the change amount ΔP of the pericardial pressure P may be used as a determination parameter. You may use the combination of for a determination.

  Next, a modified example of the insufflation device 1 that determines the quality of the insufflation operation using the pericardial pressure P, the blood pressure S, and the total insufflation amount T instead of the change amount ΔS of the blood pressure S will be described. In the following modification, a case where the change amount ΔP of the pericardial pressure P is combined with one of the pericardial pressure P, the blood pressure S, and the total air supply amount T will be described. May use any two or more parameters of the blood pressure S, the change amount ΔS of the blood pressure S, the intrapericardial pressure P, and the total air supply amount T in combination with the change amount ΔP.

(First modification)
As shown in FIG. 8, in the insufflation apparatus according to the first modification of the present embodiment, the control unit 13 holds a predetermined threshold d that is a lower limit value of the normal range of the blood pressure S, and the pericardial cavity Using the change amount ΔP of the internal pressure P and the blood pressure S, the quality of the air supply operation is determined.

That is, the control unit 13 determines that the air is normally supplied when the change amount ΔP of the pericardial pressure P is equal to or greater than the threshold value a and the blood pressure S is equal to or greater than the predetermined threshold value d.
On the other hand, when the amount of change ΔP in the pericardial pressure P is smaller than the predetermined threshold value a, the control unit 13 determines that the abnormality is B or C.
On the other hand, the control unit 13 determines that the blood pressure S is lower than the normal value (abnormal E) when the change amount ΔP of the pericardial pressure P is greater than or equal to the threshold value a and the blood pressure S is smaller than the predetermined threshold value d. Is determined.

  According to this modification, in addition to gas leakage and supply of a sufficient amount of gas into the pericardial space Y, the pericardial space Y expands, thereby compressing the heart and lowering blood pressure. Can be quickly detected based on blood pressure, and further air supply can be stopped. Therefore, it is suitable when it is sufficient to detect gas leakage while grasping the presence or absence of the influence on the heart.

(Second modification)
In the air supply device according to the second modification of the present embodiment, as shown in FIG. 9, the control unit 13 holds a predetermined threshold value e that is the upper limit value of the normal range of the pericardial pressure P, Using the pericardial pressure P and the amount of change ΔP thereof, the quality of the air feeding operation is determined.

Specifically, when the change amount ΔP of the pericardial pressure P is greater than or equal to the threshold value a and the pericardial pressure P is smaller than the threshold value e, the control unit 13 determines that the air is normally supplied. judge.
On the other hand, the control unit 13 determines that the pericardial pressure P is higher than the normal value when the change amount ΔP of the pericardial pressure P is equal to or greater than the threshold value a and the pericardial pressure P is equal to or greater than the threshold value e. Determine (abnormal F).
On the other hand, when the change amount ΔP of the pericardial pressure P is smaller than the threshold value a, the control unit 13 determines that the abnormality is B or C.

  According to this modification, in addition to the leakage of gas from the inside of the pericardial space Y to the outside and the supply of a sufficient amount of gas into the pericardial space, the pericardial pressure P is excessively high. It is possible to quickly detect that it has become. In addition, blood pressure sensing and calculation are not required. Therefore, it is suitable for the case where it is sufficient to detect a gas leak while roughly grasping the presence or absence of a load on the heart only by the change in the pericardial pressure P.

(Third Modification)
As shown in FIG. 10, the air supply device 1 ′ according to the third modification of the present embodiment has a flow rate sensor (total air supply measurement unit) 14 that measures the flow rate of the gas supplied to the pericardial space Y. The control unit 13 holds a predetermined threshold f set for the total gas supply amount T, and uses the change amount ΔP of the pericardial cavity pressure P and the total air supply amount T, The quality of the air supply operation is determined.

  The flow sensor 14 is connected between the on-off valve 10 and the tube 3, measures the flow rate of the gas supplied to the tube 3, and transmits the measured flow rate to the CPU 7. In the CPU 7, the gas flow rate from the flow rate sensor 14 is stored in the storage unit 11 in time series. The calculation unit 12 calculates the total amount T of gas supplied to the pericardial space Y through the tube 3 after starting the air supply by integrating the flow rate stored in the storage unit 11. .

The control unit 13 determines that the air is normally supplied when the change amount ΔP of the pericardial pressure P is not less than the threshold value a and the total air supply amount T is not more than the threshold value f.
On the other hand, when the change amount ΔP of the pericardial pressure P is smaller than the threshold value a, the control unit 13 determines that the abnormality is B or C.
On the other hand, the control unit 13 determines that there is an abnormality C when the change amount ΔP of the pericardial pressure P is equal to or greater than the threshold value a and the total air supply amount T is greater than the threshold value f.
According to this modification, it is possible to quickly detect a gas leak from within the pericardial space Y and that a sufficient amount of gas has been supplied into the pericardial space Y, and an arbitrary amount of air can be supplied. It is possible to avoid excessive air supply by deciding on the above, and to stop air supply more quickly.

1, 1 'air supply device 2 gas supply source 3 tube (air supply means)
4 Air supply adjustment section (air supply means)
5 Pressure sensor (Body cavity pressure measurement part)
6 Blood pressure sensor (blood pressure measurement unit)
7 Central processing unit 8 Pressure reducer 9 Pressure regulator 10 On-off valve 11 Storage unit 12 Calculation unit 13 Control unit (determination unit)
14 Flow sensor (total air flow measurement unit)
15 Notification part X Living body Y Pericardial cavity (body cavity)

Claims (5)

An air supply means for sending gas into the body cavity of a living body;
A body cavity pressure measuring unit for measuring the pressure in the body cavity;
A blood pressure measurement unit for measuring the blood pressure of the living body;
Together it determines whether the first amount of change per unit time of the pressure in the body cavity measured by the intracorporeal pressure measurement unit is smaller than the first predetermined range, measured by the blood pressure measuring portion A determination unit that determines whether or not the second change amount of blood pressure per unit time is within a second predetermined range ;
By the determination unit, the first change amount of pressure in the body cavity can and is determined to be smaller than the first predetermined range, and, the second variation of the blood pressure and the second An air supply device comprising: a control unit that stops air supply into the body cavity by the air supply means when at least one of the times when it is determined that the air flow is out of a predetermined range . An air supply means for sending gas into the body cavity of a living body;
A body cavity pressure measuring unit for measuring the pressure in the body cavity;
A blood pressure measurement unit for measuring the blood pressure of the living body;
Together it determines whether the first amount of change per unit time of the pressure in the body cavity measured by the intracorporeal pressure measurement unit is smaller than the first predetermined range, measured by the blood pressure measuring portion A determination unit for determining whether or not the blood pressure is within a third predetermined range ;
By the determination unit, can with the first amount of change in pressure in the body cavity is determined to the smaller than the predetermined range, and, when the blood pressure is determined to deviate from the third predetermined range An air supply device comprising: a control unit that stops air supply into the body cavity by the air supply means at at least one of the above. The determination unit further determines whether or not the pressure in the body cavity measured by the body cavity pressure measurement unit is within a fourth predetermined range,
Wherein the control unit, by the judging unit, can with the first amount of change in the body cavity is determined to be smaller than the first predetermined range, and the pressure in the body cavity is the fourth predetermined The air feeding device according to claim 1 or 2 , wherein the air feeding into the body cavity by the air feeding means is stopped when at least one of the times determined to be out of the range . A total air supply measurement unit for measuring the total gas supply amount after the gas supply unit starts the gas supply;
The determination unit further determines whether or not the total air flow measured by the total air flow measurement unit is within a fifth predetermined range;
Wherein the control unit, by the judging unit, can with the first amount of change in pressure in the body cavity is determined to be smaller than the first predetermined range, and wherein said total feed amount fifth The air supply device according to any one of claims 1 to 3 , wherein the air supply by the air supply means is stopped in at least one of the times when it is determined that the predetermined range is not met . The determination unit determines a cause of an abnormal air supply based on at least the first change amount of the pressure in the body cavity;
The air supply device according to any one of claims 1 to 4 , further comprising a notification unit that notifies the cause of the abnormal air supply determined by the determination unit.

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