TWI602587B - Ozone sterilization device and sterilization method - Google Patents

Description

Ozone sterilization device and sterilization method

The present invention relates to a technique for an ozone sterilization device and a sterilization method.

Conventionally, an ozone sterilizing apparatus for sterilizing a sterilization target has been known. For example, as disclosed in Patent Document 1, a related art of an endoscope sterilization device that sterilizes an endoscope as a sterilization target is known. The endoscope sterilization device as described above is forcibly performing a leaching process (pre-cleaning process) before sterilization in order to prevent contamination. Further, the ozone water used for sterilization is inoculated with air by injecting air into ozone water, thereby performing ozone decomposition.

[Previous Technical Literature] [Patent Document]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2009-39614

In medical equipment, because endoscopes are expensive, A small number of endoscopes can be used to cope with inspections. However, as described above, if the sterilization process of the endoscope sterilization device takes time, even if the endoscope is not used, it cannot be used, so that the number of times the endoscope can be used within a predetermined time is lowered.

Accordingly, an object of the present invention is to provide an ozone sterilizing apparatus and a sterilizing method which can perform sterilizing treatment in a short period of time.

The problem to be solved by the present invention is as described above, and the means for solving the problem will be described next.

In the first aspect of the patent application, the ozone sterilizing device is an ozone sterilizing device that sterilizes the object to be sterilized with ozone water, and includes a sterilizing tank for impregnating the sterilizing object. In the ozone water, the discharge pipe is configured to immerse the object to be sterilized in the ozone water after the sterilizing tank, and to discharge the immersed ozone water as drainage; and the ozone decomposer is disposed in the ozone decomposer The discharge pipe is subjected to decomposition treatment of ozone in the ozone water by the immersed ozone water.

In the second aspect of the patent application, in the ozone sterilizing apparatus of claim 1, the ozone decomposing ability of the ozone decomposer is determined by the drainage time of the ozone water.

In the third paragraph of the patent application, it is a sterilization method which uses ozone sterilization as in the first or second aspect of the patent application. The sterilizing method of the apparatus is a preliminary cleaning process for preliminarily cleaning the object to be sterilized in the sterilizing tank; and the ozone water generating project supplies the raw water to the sterilizing tank to inject ozone into the stipulation. Ozone water having a ozone concentration or higher; a sterilization process for sterilizing the object to be sterilized by the ozone water; and a discharge process for discharging the ozone water that has been sterilized.

In the fourth aspect of the patent application, in the sterilizing method according to item 3 of the patent application, the aforementioned preliminary washing engineering system may select whether or not to perform.

In the fifth aspect of the patent application, in the sterilizing method according to the third or fourth aspect of the patent application, if the transmittance of the raw water in the ozone water generating project is less than the predetermined transmittance, the suspension is suspended. The aforementioned ozone water generation project.

In the sixth aspect of the patent application, in the sterilization method according to the third or fourth aspect of the patent application, if the reduction rate of the dissolved ozone concentration in the ozone water generation project exceeds the predetermined reduction rate, the suspension is suspended. The aforementioned ozone water generation project.

In the seventh aspect of the patent application, in the sterilization method according to item 3 or item 4 of the patent application, if the increase rate of the dissolved ozone concentration in the ozone water generation project is less than the prescribed increase rate, Suspend the aforementioned ozone water generation project.

In the eighth aspect of the patent application, in the sterilizing method according to item 3 or item 4 of the patent application, in the ozone water generation project, if the ozone injection time elapses for a predetermined time, the ozone water is dissolved. When the ozone concentration is also lower than the aforementioned specified ozone concentration, the aforementioned ozone water generation project is suspended.

In the sterilizing method according to any one of claims 3 to 8, in the sterilizing process, the value is set to be higher than the predetermined ozone in accordance with the predetermined ozone concentration. The concentration of the ozone concentration is higher, and the concentration of the dissolved ozone is controlled to maintain the predetermined ozone concentration or higher. If the concentration of the dissolved ozone is less than the predetermined time for managing the ozone concentration, the sterilization process is terminated. .

In the sterilizing method according to any one of the items 5 to 9, the sterilizing device has a display means for suspending the ozone water generating process or the sterilizing engineering. At the time, the display means performs an error display.

According to the effects of the present invention, the effects shown below are achieved.

In the first item of the patent application, ozone can be decomposed while draining ozone water in the sterilization tank, thereby eliminating the time for ozone decomposition treatment in the sterilization tank. .

In the second item of the patent application scope, in addition to the effect of the first application of the patent scope, the ozone decomposition ability of the ozone decomposer is judged by the time when the ozone water is drained, and it is not necessary to provide a special The device can determine the replacement period of the ozonolysis substance.

In the third item of the patent application range, in addition to the effects of the first and second items of the patent application range, the ozone water decomposition process can be omitted, so that the sterilization treatment can be performed in a short time.

In the fourth item of the patent application, in addition to the effect of the third application of the patent scope, it is possible to select whether or not to perform the preliminary cleaning process, whereby the sterilization process can be performed in a shorter time if the preliminary cleaning process is not required.

In the fifth paragraph of the patent application, in addition to the effects of the third and fourth items of the patent application, if the raw water transmittance is less than the specified transmittance, it takes time to sterilize with ozone water. By stopping the ozone water generation project, there will be no wasted time.

In the sixth paragraph of the patent application, in addition to the effects of the third and fourth aspects of the patent application, if the reduction rate of the dissolved ozone concentration in the ozone water generation project exceeds the prescribed reduction rate, the sterilization is performed by ozone water. It takes time to process, so there is no wasted time by stopping the ozone water generation project on the way.

In the seventh item of the patent application scope, in addition to the effects of the third and fourth items of the patent application scope, if the increase rate of the dissolved ozone concentration in the ozone water generation project does not reach the prescribed increase rate, the ozone water is used. It takes time to sterilize, so it is not a waste of time by stopping the ozone water generation project on the way.

In the eighth paragraph of the scope of patent application, in addition to applying for a patent In addition to the effects of the third and fourth items, in the ozone water generation project, even if the ozone injection time elapses for a predetermined period of time, if the dissolved ozone concentration of the ozone water is lower than the specified ozone concentration, the ozone water is used for sterilization. It takes time to process, so by stopping the ozone water generation project, there will be no wasted time.

In item 9 of the scope of application for patents, in addition to the effects of items 3 to 8 of the patent application scope, in the sterilization process, if the dissolved ozone concentration is less than the time required to manage the ozone concentration, the sterilization target cannot be obtained. Since the object is properly sterilized by ozone water, it is not a waste of time by stopping the sterilization process.

In the tenth item of the patent application, in addition to the effects of items 5 to 9 of the patent application scope, if the ozone water generation project or the sterilization project is suspended, the display means is displayed incorrectly, thereby alerting the operator advice.

1‧‧‧Overpack

1a‧‧‧ front board

1b‧‧‧ side panels

1c‧‧‧back plate

2‧‧‧ sterilization tank

3‧‧‧ cover

4‧‧‧Touch panel

5‧‧‧Water flow confirmation window

6‧‧‧Water supply port

7‧‧‧Power switch

9‧‧‧Power import

10‧‧‧Endoscope

12‧‧‧Drainage

13‧‧‧ casters

14‧‧‧Endoscope connection

29‧‧‧Ozone water concentration meter

37‧‧‧Water supply pump

41‧‧‧Oxygen supply port

42‧‧‧"Lifting omitted" button

43‧‧‧"Lifting implementation" button

44‧‧‧"Input Processing Information" button

45‧‧‧"Back" button

46‧‧‧"Start" button

50‧‧‧Sterilization tube

57‧‧‧UV light source department

58‧‧‧UV Receiving Department

59‧‧‧Ozone water injection port

60‧‧‧Ozone water discharge

67‧‧‧Air discharge

70‧‧‧Drainage pipe

71‧‧‧First drain

72‧‧‧Second drain

73‧‧‧Ozone Decomposer

81‧‧‧"Bactericidal" button

82‧‧‧"Bactericidal + Alcohol" button

83‧‧‧"Leakage Check" button

84‧‧‧"Self-washing" button

85‧‧‧"Alcohol alone" button

86‧‧‧"Air Flush Separate" button

87‧‧‧"Multiple Settings/Confirmation" button

89‧‧‧"End" button

91‧‧‧"Bactericidal History" button

92‧‧‧"Exception History" button

93‧‧‧"Device Information" button

94‧‧‧"Worker Login" button

95‧‧‧"Endoscope Login" button

96‧‧‧"Other Settings" button

97‧‧‧"Back" button

100‧‧‧Endoscope sterilization device (ozone sterilization device)

Fig. 1 is a front view of an endoscope sterilization apparatus obtained by ozone water having an ozone water concentration meter.

Figure 2 is a plan view of an endoscope sterilization device obtained by ozone water in the same manner.

Fig. 3 is a right side view of the endoscope sterilization device in a state in which a drain pipe is attached in the same manner.

Figure 4 is an internal view caused by ozone water with an ozone water concentration meter. Rear view of the mirror sterilization device.

Fig. 5 is a front view showing the internal configuration of the endoscope sterilization apparatus which is similarly caused by ozone water.

Fig. 6 is a right side view showing the internal configuration of the endoscope sterilizing apparatus which is similarly caused by ozone water.

Fig. 7 is a side view of an ozone water concentration meter disposed in an endoscope sterilization apparatus by ozone water.

8 is a view showing a content displayed on the touch panel, (a) is a view showing a processing item, and (b) is a view showing a screen after selecting the "various setting/confirmation" button shown in (a), ( c) A diagram showing the screen after selecting the "sterilization" button shown in (a).

Figure 9 is a flow chart showing a conventional method of washing/sterilizing.

Fig. 10 is a flow chart showing the sterilization method of the first embodiment of the present invention.

Fig. 11 is an explanatory diagram for explaining a method for measuring the dissolved ozone concentration of ozone water, wherein (a) shows a temporal change pattern of the ultraviolet light transmission amount, and (b) shows a temporal change chart of the dissolved ozone concentration.

Fig. 12 is a conceptual diagram showing (b) of Fig. 11.

Fig. 13 is a flow chart showing a sterilization method according to a second embodiment of the present invention.

Fig. 14 is a flow chart showing a sterilization method according to a third embodiment of the present invention.

Fig. 15 is an explanatory view showing a method of controlling the concentration of dissolved ozone in a sterilization process, wherein (a) shows a temporal change pattern of dissolved ozone concentration, and (b) The time-dependent change graph of the dissolved ozone concentration at the time of stopping the sterilization process is shown.

Next, an embodiment of the invention will be described.

First, the configuration of the endoscope sterilizing apparatus 100 as an embodiment of the ozone sterilizing apparatus according to the embodiment of the present invention will be described with reference to Figs. 1 to 5 .

The endoscope sterilization device 100 is an ozone sterilization device that sterilizes the endoscope 10 as a sterilization target with ozone water. The endoscope sterilizing apparatus 100 includes a sterilizing tank 2 for immersing the endoscope 10 in the ozone water, and immersing the endoscope 10 in the ozone water in the sterilizing tank 2, and then immersing the lining 10 The discharge pipe 70 in which the ozone water is discharged as the drain water; and the ozone decomposer 73 disposed in the discharge pipe 70 to decompose the ozone in the ozone water by the immersed ozone water. The endoscope sterilization apparatus 100 immerses the endoscope 10 as an object to be sterilized in the inside of the sterilization tank 2 filled with ozone water, and cleans/sterilizes the ozone mirror water to the inside of the endoscope 10. This system has an outer package 1 which is constituted by a front plate 1a, side plates 1b and 1b, a back plate 1c, a lid body 3, and the like. The lid body 3 is a portion that opens and closes when the tray supporting the state of the endoscope 10 is taken out, and is locked by the lid locking mechanism in a manner that the lid body 3 is not opened during the sterilization process. . The sterilization tank 2 is formed inside the outer package 1, and the endoscope 10 provided in the tray is immersed in ozone water filled in the sterilization tank 2 to perform sterilization treatment.

On the upper surface of the endoscope sterilization apparatus 100, in addition to the lid body 3, a touch panel 4 and a water flow confirmation window 5 are provided in a non-openable and closable portion. The touch panel 4 is a touch panel operation panel and a liquid crystal display panel for status display, and is formed to perform an operation of cleaning/sterilizing by displaying the operation content of the touch panel 4 by touch, and displaying The composition of the progress state of the current job. Further, the water flow confirmation window 5 is a window for confirming that the water normally flows during the sterilization process, and is configured to visually confirm whether or not a water flow is flowing inside the pipe member to be disposed.

As shown in Figure 4, 7 is the power switch. 9 is the power inlet (inlet), which is the terminal for the input power.

A water supply port 6 is provided in the back portion of the outer package 1, and is configured to supply tap water from the water channel as raw water for generating ozone water. A drain port 12 is additionally provided on the back surface of the outer package 1, and is configured to discharge water after sterilization treatment. 13 is a caster that makes it possible to move the endoscope sterilization device 100 by ozone water.

Next, the inside of the endoscope sterilization apparatus 100 by ozone water will be described in detail in FIGS. 4 to 6.

An endoscope connection port 14 is provided inside the sterilization tank 2. The endoscope 10 is attached to the endoscope connection port 14 through the sterilization tube 50. The ozone water system is configured to be discharged into the passage of the endoscope 10 through the sterilization tube 50 through the endoscope connection port 14.

In the present embodiment, an ozone gas generating unit that generates ozone gas is disposed as an endoscope sterilization device 100 obtained by ozone water. In the interior of the ozone gas generating unit, useful for generating ozone Gas ozone generator. The oxygen of the oxygen cylinder is supplied from the oxygen supply port 41 to the ozone gas generating unit, and the ozone gas is generated by the oxygen by the ozone generator. The generated ozone gas is injected into the raw water in the ozone water generating unit in the body to generate ozone water.

The ozone water generated in the ozone water generating unit is flown into the inside of the passage of the endoscope 10 through the endoscope connection port 14 by the endoscope sterilization unit in the body. A water supply pump 37 is provided in the middle of the body. The water supply pump 37 supplies water to the ozone water generating unit, the ozone water concentration meter 29, and the endoscope sterilization unit.

The ozone water concentration meter 29 is a dissolved ozone concentration meter for detecting the dissolved ozone concentration of the ozone water generated by the ozone water generating unit.

Further, an ozone decomposing unit is provided in the lower portion of the body. The ozone decomposing unit is a device for decomposing ozone gas separated by ozone water in the sterilization tank 2 into safe oxygen gas and discharging it to the outside.

In the configuration shown above, as shown in FIG. 6, a portion of the ozone water transported by the ozone water generating unit through the ozone water supply path is continuously sampled by the water supply pump 37 for continuous detection processing. The ozone water concentration meter 29 in which the ozone concentration of the ozone water is dissolved is disposed in the upper portion of the body. As shown in FIG. 7, the ozone water concentration meter 29 is composed of a UV light source unit 57, a UV light receiving unit 58, an ozone water injection port 59, an ozone water discharge port 60, and an air discharge port 67. The ozone water concentration meter 29 and the water supply pump 37 are connected to a control device (not shown). The control device is configured to execute a predetermined processing control program of the ozone water concentration meter 29 that is stored in advance, and a predetermined control method for measuring the dissolved ozone concentration of the ozone water to be described later. Program. The control device controls the ozone water concentration meter 29 and the water supply pump 37, and supplies the sampled raw water or ozone water to the ozone water injection port 59, and irradiates the ozone water with UV (ultraviolet light) from the UV light source unit 57, and receives UV light. The portion 58 receives light, and the dissolved ozone concentration of the ozone water is determined by the attenuation of the UV light. In other words, the control device calculates the ratio of the ultraviolet light transmission amount when the raw water detected by the UV light receiving unit 58 is passed through water and the ultraviolet light transmission amount of the ozone water generated by injecting the ozone gas into the raw water. Dissolve the ozone concentration.

However, when the raw water used in the generation of the ozone water contains a substance which changes the amount of ultraviolet light transmitted by the reaction with ozone, it is measured to be lower than the original dissolved ozone concentration when measured by the ozone water concentration meter 29. The low value does not correctly determine the dissolved ozone concentration of ozone water. Therefore, in the case where the substance is contained, it is also necessary to accurately measure the dissolved ozone concentration. The control device according to the present embodiment is configured to accurately measure the dissolved ozone concentration in the case where the substance is contained, and will be described in detail later.

The drain port 12 is connected to the drain pipe 70 shown in FIG. 3, and drains the ozone water in the endoscope sterilizing device 100 to the outside. The discharge pipe 70 is configured to immerse the endoscope 10 in the ozone water after the sterilization tank 2, and then discharge the immersed ozone water as drainage. The drain pipe 70 is configured such that the ozone decomposer 73 is disposed in the middle portion thereof, and the ozone in the ozone water is decomposed and then discharged. That is, one end of the first drain pipe 71 as a part of the drain pipe 70 is fixed to the drain port 12, and the other end of the first drain pipe 71 is fixed to one end of the ozone decomposer 73. In addition, one end of the second drain pipe 72 as a part of the drain pipe 70 is fixed at The other end of the ozone decomposer 73.

The ozone decomposer 73 is disposed in the discharge pipe 70 for decomposing the ozone in the ozone water by the immersed ozone water. The ozone decomposer 73 is configured to be filled with activated carbon as an ozone decomposing product, and the ozone water passes through the ozone decomposer 73, and the activated carbon is brought into contact with ozone to decompose the ozone.

Among them, the ozonolysate is not limited to activated carbon, and may be formed by a ceramic or aluminum having a honeycomb structure supporting a catalyst of manganese dioxide or nickel oxide.

On the other hand, the control device of the endoscope sterilization device 100 measures the drainage time of the ozone water. Since the ozone water in the sterilization tank 2 is a substantially constant amount (volume), the drainage time becomes an index of the activity amount of the activated carbon in the ozone decomposer 73. Next, when the drainage time is required to be longer than the predetermined time, the touch panel 4 displays that the activated carbon in the ozone decomposer 73 must be replaced to urge the operator to replace the activated carbon. Here, the drainage engineering is adapted to step S401 which will be described later.

In the configuration as described above, the ozone decomposing treatment is not performed in the sterilization tank 2, and the ozone water discharged from the drain port 12 passes through the first drain pipe 71, and the activity in the ozone decomposer 73 is utilized. Since carbon decomposes the ozone, thereby making it non-toxic, the time for performing the ozonolysis treatment in the sterilization tank 2 can be saved. Further, the ozone decomposing ability of the ozone decomposer 73 is judged by the time when the ozone water is drained, whereby the replacement period of the ozonolysis substance can be judged without providing a special device.

Next, the contents of the touch panel 4 to be displayed in the endoscope sterilization apparatus 100 will be described using FIG.

When the touch panel 4 is activated, as shown in FIG. 8(a), the "sterilization" button 81, the "sterilization + alcohol" button 82, the "leakage check" button 83, and the "self-cleaning" button 84 are displayed. The items of the "alcohol alone" button 85, the "air flushing alone" button 86, the "various setting/confirmation" button 87, and the "end" button 89 are processed.

The "various setting/confirmation" button 87 is a button for confirming various settings or contents to be set. When the operator selects the "various setting/confirmation" button 87, the screen shown in FIG. 8(b) is displayed on the touch panel 4. Next, by selecting the displayed "sterilization history" button 91, "abnormal history" button 92, "device information" button 93, "worker registration" button 94, "endoscope registration" button 95, "other" By setting the "key 96", various settings and confirmations can be made, and by selecting the "RETURN" button 97, the screen shown in Fig. 8(a) can be returned.

The "sterilization history" button 91 is a button for outputting data of a work history (sterilization history) to which various setting items are added. The rear surface of the endoscope sterilization device 100 is configured to be connected to a USB (Universal Serial Bus) memory medium such as a memory device, and can output the data to the USB memory and take the data to the personal computer. .

Similarly to the "sterilization history" button 91, the "abnormal history" button 92 is used to stop the worker from being stopped in the middle of the sterilization process or is forcibly suspended due to an error, and is not normally cleaned/sterilized. The history of the sterilization of the mirror is output to the external button.

The "device information" button 93 is a button for confirming the basic information of the endoscope sterilization device 100, the number of operations, and the like. For example, the type of the endoscope sterilization device 100, the manufacturing number, the program version, the number of maintenance times, the number of operations due to the processing items of the "sterilization" button 81, and the processing items by the "sterilization + alcohol" button 82 are used. The number of operations, etc.

The "worker registration" button 94 is a button for registering an operator number and a worker name, and is used to identify an operator by registering an operator with a predetermined number.

The "inner mirror registration" button 95 is a button for registering the endoscope number and the name of the endoscope to assign an individual number to the plurality of endoscopes, thereby identifying the endoscope.

In the "Other Settings" 96, the amount of alcohol injection, the time, and the concentration of ozone water can be set. The setting of the time is used in the endoscope sterilization apparatus 100, and what kind of operation is performed when and where the date is performed.

The "sterilization" button 81, the "sterilization + alcohol" button 82, and the "alcohol alone" button 85 shown in Fig. 8(a) are buttons for cleaning/sterilization work, and are selected for the endoscope 10 to be performed. The person who handled the cleaning/sterilization.

Specifically, when the "sterilization" button 81 is pressed and selected, the screen shown in FIG. 8(c) is obtained. The screen is provided with a "washing omitted" button 42, a "rinsing implemented" button 43, an "input processing information" button 44, a "return" button 45, and a "start" button 46. In the upper left part of the screen, the selected item is displayed. In the upper right section, the progress of the operation is displayed and can be confirmed by the operator. The work items, precautions, and the like of the selected item are displayed on the middle of the screen. Next, a "washing omitted/implementation" button 42/43 for selecting whether or not to perform preliminary cleaning is provided in the middle of the screen. When the "washing omitted" button 42 is selected, the preparatory cleaning process performed before the sterilization process is omitted. Further, when the "rinsing implementation" button 43 is selected, the preliminary cleaning is performed before the sterilization process. In addition, if the "washing omission/implementation" 42/43 is once stored in the control device, if it is pressed, if the button is not pressed again, the same as the previous time. s Choice. The "processing information input" button 44 is used to move to the number of the worker who inputs the cleaning operation of the endoscope 10, that is, the worker number, the patient identification number assigned to each patient, and the cleaning. The unique number of the endoscope of the work is the button of the screen such as the endoscope number. However, the "Process Information Input" button 44 may not be selected, and the input of the information may be omitted. The "Back" button 45 is used to return to the previous screen, that is, the button for selecting the screen of the processing shown in (a) of FIG. The "Start" button 46 is a button for starting the job of the item displayed on the upper left.

When the "Bactericidal + Alcohol" button 82 shown in (a) of FIG. 8 is selected, the next screen is formed, and the selected item, that is, the "sterilization + alcohol" display is displayed in the upper left portion of the screen. The upper right section shows the progress of the job and can be confirmed by the operator. The work item or precautions of the selected item are displayed on the middle of the screen. Next, the lower and lower sections of the screen are arranged in the same manner as (a) of Fig. 8. Buttons.

The "leakage check" button 83, the "self-cleaning" button 84, and the "air flushing individual" button 86 shown in Fig. 8(a) are maintenance related items. The "leakage check" button 83 is a button for finding the leak port of the endoscope 10. The "self-cleaning" button 84 is a button for washing the inside of the endoscope sterilizing device 100. The "air flushing alone" button 86 is an item for air flushing the inside of the endoscope sterilizing device 100. When any one of the processing buttons is selected, a message conforming to each maintenance item is displayed on the touch panel 4, and the worker performs an operation or operation in accordance with the display.

Next, a sterilization method of the endoscope sterilization apparatus 100 will be described.

The conventional endoscope sterilization device cannot select whether or not to perform the preliminary cleaning S10 even when the sterilization process S30 is to be performed. Therefore, as shown in FIG. 9, the following work is performed as a series of works: it will be located in the sterilization tank. The preliminary cleaning process S10 for preparing the object to be sterilized, the raw water to be supplied to the sterilizing tank, and the ozone water generating project S20 for injecting ozone into an appropriate concentration of ozone water; and the sterilizing target is performed by the ozone water The sterilizing sterilization process S30 of the object; and the ozone water decomposition project S40 for injecting oxygen into the sterilization tank 2 and decomposing the ozone. Further, in the conventional ozone water decomposition project S40, ozone is decomposed in the ozone water by injecting oxygen into the sterilization tank 2, and thus it takes time.

However, the endoscope sterilization apparatus 100 of the present embodiment can selectively perform the cleaning/sterilization method, thereby eliminating the need for preparatory cleaning. In the case of the process S10, if only the sterilization is set, the ozone water generation project S20, the sterilization process S30, and the drainage project S50 are formed into a series of processes, so that the cleaning/sterilization time can be shortened. Further, the drainage project S50 can decompose ozone while discharging the ozone water in the sterilization tank 2, so that the cleaning/sterilization time can be further shortened.

In the following, the cleaning/sterilization process of the endoscope sterilization device 100 when the cleaning is not required is described using three embodiments.

First, the cleaning process of the first embodiment for determining whether or not to clean the endoscope 10 by the transmittance of the raw water, and determining whether or not to stop the cleaning of the endoscope 10 will be described with reference to FIGS. 10 to 12 .

In step S201, the control device supplies a predetermined amount of raw water to the sterilization tank 2, and moves to step S202. Next, in step S202, the control device acquires the first transmitted light amount C1 (here, the raw water transmitted light amount) of the raw water to be supplied. The first transmitted light amount C1 detects the ultraviolet light transmission amount of the raw water every predetermined time (in the present embodiment, every 0.2 seconds), and is detected in the past for a predetermined time (in the present embodiment, 5.0 seconds). The average value of the amount of ultraviolet light transmitted to the raw water. Further, the control device obtains the raw water transmittance Ta and the first ozone concentration Da by conversion of the first transmitted light amount C1. The raw water transmittance Ta is calculated by dividing the first transmitted light amount C1 of the UV light received by the UV light receiving unit 58 of the ozone water concentration meter by the total light amount of the UV light from the UV light source unit 57. Here, the transmittance indicates the ratio of the light passing through the sample water (here, the raw water), and the larger the value is estimated, the more the sample water is stained. low.

In step S203, the control device determines whether or not the raw water transmittance Ta obtained in step S202 is equal to or higher than the predetermined transmittance Tj. This determination is a determination as to whether or not the degree of contamination of the raw water is high, and the cleanness of the raw water is determined. However, the determination criterion may be used not to be the transmittance, and the first transmitted light amount C1 may be used as a criterion.

When it is determined in step S203 that the raw water transmittance Ta is less than the predetermined transmittance Tj, that is, if the cleanness of the raw water is insufficient and cannot be used, the control proceeds to step S601. Next, in step S601, the control device stops the cleaning/sterilization operation, displays an error on the touch panel 4, and discharges the raw water supplied into the sterilization tank 2. The erroneous content of the touch panel 4 is a display that stops the work of the work because the cleanness of the raw water is insufficient and cannot be used.

When it is determined in step S203 that the raw water transmittance Ta is equal to or greater than the predetermined transmittance Tj, that is, the raw water is usable, the control proceeds to step S204. Next, in step S204, the control device injects ozone into the raw water, and the process proceeds to step S205.

In step S205, the control device acquires the second transmitted light amount C2, which is the amount of transmitted light of the ozone water during ozone injection, and proceeds to step S206. Here, the second transmitted light amount C2 detects the ultraviolet light transmission amount of the raw water in the ozone injection every predetermined time (in the present embodiment, every 0.2 seconds), and is past a predetermined time (in the present embodiment, 5.0). Second) The average value of the ultraviolet light transmission amount of the detected ozone water.

In step S206, the control device determines the step in the previous stage. Whether or not the second transmitted light amount C2 obtained in step S205 is equal to or smaller than the first transmitted light amount C1. In the case where the raw water used for generating ozone water contains a substance which changes the amount of ultraviolet light transmitted by the reaction with ozone, it is measured as the dissolved ozone concentration by the ozone water concentration meter 29. For lower values, the dissolved ozone concentration of ozone water cannot be correctly determined. That is, the loops of steps S204, S205, S206, and S207 are the points of point A to point B of FIG. 11 for measuring the dissolved ozone concentration converted based on the amount of transmitted light as the true dissolved ozone concentration.

When it is determined in step S206 that the second transmitted light amount C2 exceeds the first transmitted light amount C1, that is, when the ozone water contains a substance that changes the amount of ultraviolet light transmitted by the reaction with ozone, the control device proceeds to step S207. Go to step S204 again. Here, in step S207, the control device replaces the first transmitted light amount C1 with the value of the second transmitted light amount C2, and performs the processing of step S204 again.

When it is determined in step S206 that the second transmitted light amount C2 is equal to or less than the first transmitted light amount C1, it is determined that the ozone water does not contain a substance that changes the amount of ultraviolet light transmitted by the reaction with ozone (that is, from When the substance which changes by the ultraviolet-transmission amount by reaction with ozone is not contained, or all the reaction with ozone is completed, it transfers to step S208. At this time, it is judged that the transmitted light amount Cb shown in (a) of FIG. 11 has been reached, and it is determined that the dissolved ozone concentration shown in (b) of FIG. 11 is the lowest ozone concentration Db, that is, the smallest value.

In step S208, the control device converts the minimum ozone concentration Db from the second transmitted light amount C2 measured instantaneously, and moves to the step. S209. In step S209, the control device acquires the third transmitted light amount C3 and the third transmitted light amount C3 converted into the third ozone concentration D3, and the process proceeds to step S210. Here, the third transmitted light amount C3 refers to the value of the point B to the point C in (a) of FIG. 11 , and the third ozone concentration D3 refers to the value of the point B to the point C in (b) of FIG. 11 .

In step S210, the control device determines whether the minimum ozone concentration Db is deducted by the third ozone concentration D3, that is, whether the corrected ozone concentration D3-Db is equal to or higher than the predetermined ozone concentration Dm. This judgment is a judgment as to whether or not the dissolved ozone concentration of the ozone water has reached the set value. Here, as shown in FIG. 12, the predetermined ozone concentration Dm is a raw water in which the ozone water contains a substance which changes the amount of ultraviolet light transmitted by the reaction with ozone, and if the zero point correction is not performed, the correct concentration is not formed. That is, the dissolved ozone concentration of the raw water, that is, the first ozone concentration Da is a concentration at which the dissolved ozone concentration is not zero, but the lowest ozone concentration Db of the ozone water to be injected into the ozone is 0, and thus the dissolved ozone concentration is performed here. Correction.

When it is determined in step S210 that the corrected ozone concentration D3-Db is less than the predetermined ozone concentration Dm, that is, the concentration of ozone water that is not sufficiently sterilized by the endoscope 10, the control device proceeds to step S209.

When it is determined that the corrected ozone concentration D3-Db is equal to or greater than the predetermined ozone concentration Dm, that is, the concentration of the ozone water sufficient for sterilization of the endoscope 10, the control device proceeds to step S301.

This step S201 to step S210 is a process of generating ozone water.

In step S301, the control device will stink at a predetermined time Oxygen water is supplied into the passage of the endoscope 10 through the sterilization tube 50 through the endoscope connection port 14, and the inside of the endoscope 10 is sterilized and ejected to the outside of the passage. Then, convection is generated in the sterilization tank 2 by the ozone water that has been discharged to the outside of the passage, and the outside of the endoscope 10 is sterilized. Here, step S301 refers to a sterilization process in which the dissolved ozone concentration is also measured successively, and when it is reduced, the control device is controlled by injecting ozone. In step S301, if a predetermined time elapses, the control device moves to step S401.

In step S401, the control device discharges the ozone water in the sterilization tank 2. Then, the ozone water to be discharged is passed through the first drain pipe 71 through the drain port 12, and flows into the ozone decomposer 73, and the ozone is decomposed by the activated carbon which is an ozone decomposer in the ozone decomposer 73. The drain in which the ozone is decomposed is discharged to the outside of the endoscope sterilization apparatus 100 through the second drain pipe 72.

As described above, when the raw water transmittance Ta is less than the predetermined transmittance Tj, it takes time to perform the sterilization treatment with ozone water. Therefore, by stopping the ozone water generation project, there is no wasted time. situation. Further, when it is determined that the control device does not enter the sterilization process and the ozone water generation project is suspended, the warning display can be performed by performing an error display on the touch panel 4 as a display means.

Next, the reduction rate and the increase rate of the dissolved ozone concentration in the ozone water generation process will be described, and the degree of contamination of the endoscope 10 will be determined, and whether or not the cleaning/sterilization operation of the endoscope 10 is suspended will be determined. The washing/sterilizing method in the second embodiment.

In step S701, the control device sets a predetermined amount of raw water It is supplied to the sterilization tank 2, and it transfers to step S702.

In step S702, the control device acquires the first transmitted light amount C1, which is the transmitted light amount of the raw water to be supplied, and the first ozone concentration Da, which is converted by the first transmitted light amount C1, and proceeds to step S703.

In step S703, the control device injects ozone into the raw water, and the process proceeds to step S704. In step S704, the control device obtains the second transmitted light amount C2 which is the amount of transmitted light of the ozone water during ozone injection, and derives the curve shown in FIG. 11(b) from the second transmitted light amount C2 to obtain the second transmitted light amount. The increase rate of dissolved ozone concentration of C2 is R2.

In step S705, the control device determines whether or not the second transmitted light amount C2 acquired in the previous step S704 is equal to or less than the first transmitted light amount C1. This judgment is based on whether or not the ozone water contains a substance that changes the amount of ultraviolet light transmitted by the reaction with ozone.

When it is determined in step S705 that the second transmitted light amount C2 exceeds the first transmitted light amount C1, the control device proceeds to step S706, and when it is determined that the second transmitted light amount C2 is equal to or smaller than the first transmitted light amount C1, the control device moves to Step S708.

In step S706, the control device determines whether or not the absolute value of the increase rate R2 of the dissolved ozone concentration acquired in step S704 exceeds the predetermined reduction rate Rm. This determination is made to determine whether or not the sterilization process requires a considerable amount of time, and is a determination as to whether or not the concentration of the substance whose ultraviolet transmittance is changed by the reaction with ozone in the raw water exceeds the usable concentration. Here, the increase rate R2 of the dissolved ozone concentration is a negative value, and the absolute value of the value becomes the decrease rate. Further, the predetermined reduction rate Rm is a positive value.

When it is determined in step S706 that the absolute value (reduction rate) of the increase rate R2 of the dissolved ozone concentration is equal to or less than the predetermined reduction rate Rm, the control device proceeds to step S707. In step S707, the control device replaces the first transmitted light amount C1 with the value of the second transmitted light amount C2, and performs the processing of step S703 again.

When it is determined in step S706 that the absolute value (reduction rate) of the obtained increase rate R4 of the dissolved ozone concentration exceeds the predetermined reduction rate Rm, that is, when it is determined that it takes a certain time to enter the sterilization process, the control device moves Go to step S601.

On the other hand, in step S708, the control device converts the minimum ozone concentration Db from the second transmitted light amount C2, and the process proceeds to step S709. In step S709, the control device acquires the third transmitted light amount C3 and converts the third transmitted light amount C3 to obtain the third ozone concentration D3. In addition, the control device derives the curve shown in FIG. 11(b) from the third transmitted light amount C3, and obtains the increase rate R3 of the dissolved ozone concentration at the obtained third transmitted light amount C3, and proceeds to step S710.

In step S710, the control device determines whether or not the increase rate R3 of the dissolved ozone concentration obtained in the previous stage is equal to or higher than the predetermined increase rate Rn. This determination determines whether or not the sterilization process requires a considerable amount of time, and is a determination as to whether or not the endoscope 10 is in a desired state for preliminary washing.

When it is determined that the increase rate R3 of the dissolved ozone concentration is equal to or greater than the predetermined increase rate Rn, the control device proceeds to step S711, and determines that the increase rate R3 of the dissolved ozone concentration is less than the predetermined increase rate Rn. Then, the process moves to step S601.

In step S711, the control device determines whether or not the corrected ozone concentration D3-Db is equal to or higher than the predetermined ozone concentration Dm. This judgment is a judgment as to whether or not the dissolved ozone concentration of the ozone water has reached the set value.

When it is determined in step S711 that the corrected ozone concentration D3-Db is less than the predetermined ozone concentration Dm, that is, the concentration of the ozone water that is not sufficiently sterilized by the endoscope 10, the control device proceeds to step S709.

When it is determined that the corrected ozone concentration D3-Db is equal to or greater than the predetermined ozone concentration Dm, that is, the concentration of the ozone water sufficient for sterilization of the endoscope 10, the control device proceeds to step S301.

The sterilization process in step S301, the drainage process in step S401, the error display in step S601, and the drainage system are the same as those in the above embodiment, and thus the description thereof is omitted.

When the reduction rate of the dissolved ozone concentration (the absolute value of the increase rate R2) in the ozone water generation process exceeds the predetermined reduction rate Rm which is a predetermined value, it takes time to perform the sterilization treatment with the ozone water, and therefore, it is suspended on the way. The ozone water generation project will not waste time.

In addition, when the increase rate R3 of the dissolved ozone concentration in the ozone water generation process does not reach the predetermined increase rate Rn which is a predetermined value, it takes time to perform the sterilization treatment with the ozone water, and therefore the ozone water generation project is stopped by the middle of the process. There will be no wasted time.

Finally, the cleaning/sterilization method in the third embodiment for determining whether or not the degree of contamination of the endoscope 10 is determined when the dissolved ozone concentration reaches the target value and whether or not to stop the cleaning of the endoscope 10 will be described with reference to FIG. law.

In step S801, the control device supplies a predetermined amount of raw water to the sterilization tank 2, and moves to step S802. In step S802, the control device acquires the first transmitted light amount C1 of the raw water to be supplied, the first measurement time t1 at which the first transmitted light amount C1 is measured, and the first ozone concentration after the converted first transmitted light amount C1. Da, and moves to step S803. In step S803, the control device injects ozone into ozone water and moves to step S804. In step S804, the control device acquires the second transmitted light amount C2 which is the amount of transmitted light of the ozone water during ozone injection, and the second measurement time t2 at which the second transmitted light amount C2 is measured, and the process proceeds to step S805.

In step S805, the control device determines whether or not the second transmitted light amount C2 acquired in the previous step S804 is equal to or smaller than the first transmitted light amount C1.

When it is determined in step S805 that the second transmitted light amount C2 exceeds the first transmitted light amount C1, the control device proceeds to step S806, and when it is determined that the second transmitted light amount C2 is equal to or smaller than the first transmitted light amount C1, the control device moves to Step S808.

When it is determined in step S805 that the second transmitted light amount C2 exceeds the first transmitted light amount C1, that is, when the ozone water contains a substance that changes the amount of ultraviolet light transmitted by the reaction with ozone, the control unit moves to the step. S806.

In step S806, the control device determines that the first acquired in step S802 is subtracted from the second measurement time t2 acquired in step S804. The value at the time t1, that is, the elapsed time from the ozone injection, is equal to or longer than the predetermined time T1.

The control device determines in step S806 that (the second measurement time t2) - (the first measurement time t1) is within the predetermined time T1 (not reached), that is, when the ozone injection time is not the predetermined time T1, the movement is shifted. Go to step S807. In step S807, the control device replaces the first transmitted light amount C1 with the value of the second transmitted light amount C2, and performs the processing of step S803 again.

When it is determined in step S806 that the (second measurement time t2) - (first measurement time t1) is equal to or longer than the predetermined time T1, that is, when the ozone injection time has elapsed for a predetermined time T1, the control device proceeds to step S601.

On the other hand, when it is determined in step S805 that the second transmitted light amount C2 is equal to or smaller than the first transmitted light amount C1, it is determined that the ozone water does not contain a change in the ultraviolet transmittance due to reaction with ozone. When the substance is present, the process proceeds to step S808. In step S808, the control device converts the minimum ozone concentration Db from the second transmitted light amount C2, and the process proceeds to step S809. The lowest ozone concentration Db is point B shown in (b) of Fig. 11 .

In step S809, the control device acquires the third transmitted light amount C3 and the third measurement time t3, and obtains the third ozone concentration D3 by converting the third transmitted light amount C3, and the process proceeds to step S810.

In step S810, the control device determines whether or not the corrected ozone concentration D3-Db is equal to or higher than the predetermined ozone concentration Dm. This judgment is a judgment as to whether or not the dissolved ozone concentration of the ozone water has reached the set value.

The control device is in step S810, if it is determined that the correction is correct When the oxygen concentration D3-Db is less than the predetermined ozone concentration Dm, that is, the concentration of the ozone water which is not sufficiently sterilized by the endoscope 10, the process proceeds to step S811.

In step S811, the control device determines whether (third measurement time t3) - (first measurement time t1) is equal to or longer than the predetermined time T2. This judgment is a judgment as to whether or not the ozone injection time has passed a predetermined time.

When it is determined in step S811 that the (third measurement time t3) - (first measurement time t1) is equal to or longer than the predetermined time T2, that is, when the ozone injection time has elapsed for a predetermined time T2, the control proceeds to step S601.

When it is determined in step S811 that the (third measurement time t3) - (first measurement time t1) is less than the predetermined time T2, that is, when the ozone injection time has not elapsed for the predetermined time T2, the control device moves to step S809 again. . When it is determined that the corrected ozone concentration D3-Db is equal to or greater than the predetermined ozone concentration Dm, that is, the concentration of the ozone water sufficient for sterilization of the endoscope 10, the control device proceeds to step S301.

The sterilization process in step S301, the drainage process in step S401, the error display in step S601, and the drainage system are the same as those in the above embodiment, and thus the description thereof is omitted.

By arranging as described above, even in the ozone water generation process, when the ozone injection time elapses for a predetermined period of time, if the dissolved ozone concentration is lower than the predetermined ozone concentration Dm, it takes time to perform sterilization treatment with ozone water, thereby Stopping the ozone water generation project will not waste time.

The first embodiment, the second embodiment, and the third embodiment The sterilization process in the embodiment is step S301, and is described in detail below using FIG.

The ozone is injected or stopped according to the dissolved ozone concentration to keep the dissolved ozone concentration constant. In other words, the control device controls the dissolved ozone concentration so as not to be equal to or lower than a predetermined concentration (predetermined ozone concentration Dm) by appropriately performing ozone injection and stop. In this control, the control device sets the predetermined ozone concentration Dm, the management ozone concentration Ds, the injection start ozone concentration Di, and the injection stop ozone concentration Dh in descending order of the concentration. These values correspond to the corrected ozone concentration D3-Db.

The ozone concentration Dm is specified to be the dissolved ozone concentration required to ensure the sterilization performance. The sterilizing performance can be ensured by performing sterilization treatment for a predetermined period of time in a dissolved ozone concentration having a predetermined ozone concentration Dm or more. The management ozone concentration Ds is a value slightly higher than the specified ozone concentration Dm. Specifically, the predetermined ozone concentration Dm was set to 0.5 ppm, and the managed ozone concentration Ds was set to 0.6 ppm. The control device is controlled to manage the dissolved ozone concentration equal to or higher than the ozone concentration Ds for a predetermined period of time. The reason why the management ozone concentration Ds is higher than the predetermined ozone concentration Dm is based on factors such as the measurement accuracy of the dissolved ozone concentration. The injection start ozone concentration Di is the concentration at which ozone is injected. The injection start ozone concentration Di is a dissolved ozone concentration set to increase the dissolved ozone concentration again before the ozone concentration is lowered and the dissolved ozone concentration is lowered once the dissolved ozone concentration is increased. Even if ozone injection starts, the dissolved ozone concentration does not rise immediately due to the lack of (undershoot), therefore, the injection start ozone concentration Di is formed to a value higher than the management ozone concentration Ds. The injection stop ozone concentration Dh is the concentration at which ozone injection is stopped. The injection stop ozone concentration Dh is such that when the ozone concentration starts to be injected and the dissolved ozone concentration rises, the concentration of the ozone injection is stopped so that the dissolved ozone concentration does not rise too much. Even if the ozone injection is stopped, the dissolved ozone concentration does not immediately drop. Due to the overshoot, the injection stop ozone concentration Dh is formed to a slightly higher value than the injection start ozone concentration Di in such a manner as to be stable. . Specifically, the predetermined ozone concentration Dm was set to 0.5 ppm, the injection start ozone concentration Di was set to 0.7 ppm, and the injection stop ozone concentration Dh was set to 0.8 ppm.

In the sterilization process of step S301, in order to maintain the dissolved ozone concentration, the control device strictly controls the next ozone in order to form the predetermined ozone concentration Dm or more.

The control device is controlled to continue to inject ozone when the ozone water generation project is moved to the sterilization process. The control device shifts to a mode in which the concentration of ozone water is maintained when the dissolved ozone concentration initially exceeds the management ozone concentration Ds. The control device continues to inject ozone, and if the dissolved ozone concentration reaches the injection stop ozone concentration Dh, the injection of ozone is stopped. Even if ozone injection is stopped, the dissolved ozone concentration does not fall immediately, and it is temporarily over-capacity. When the time elapses while the ozone injection is stopped, the dissolved ozone concentration of the ozone water is lowered to fall to the injection start ozone concentration Di. As a result, the control device begins to inject ozone. Even if ozone is injected, the concentration of dissolved ozone will rise immediately, forming an underfill, and then dissolved. The concentration of stored ozone is rising. As described above, the control device repeatedly performs the injection and the stop of ozone corresponding to the dissolved ozone concentration as described above, whereby the dissolved ozone concentration is not lower than the managed ozone concentration Ds, that is, the predetermined ozone concentration Dm. The above methods are controlled.

The time of the sterilization process is the cumulative time of the management ozone concentration Ds or more, except for the time when the dissolved ozone concentration is less than the management ozone concentration Ds. For example, when the time of the sterilization process is 5 minutes and the time when the ozone concentration Ds is managed is 20 seconds in total, the process of maintaining the concentration of ozone water is completed after 5 minutes and 20 seconds after the initial management of the ozone concentration Ds. And proceeds to the drainage project of step S401.

Under the control as described above, if the preliminary cleaning of the endoscope 10 by washing hands or the like is insufficient, the dissolved ozone concentration may not reach the managed ozone concentration Ds. Specifically, as shown in (b) of FIG. 15, the control device continues to inject ozone, and when the dissolved ozone concentration reaches the injection stop ozone concentration Dh, the ozone injection is stopped. When the time elapses while the ozone injection is stopped, the dissolved ozone concentration of the ozone water is lowered, and when the injection start ozone concentration Di is reached, the control device starts to inject the ozone. Even if ozone is injected, it continues to owe less than the managed ozone concentration Ds. In this manner, the control device acquires the time t5 at which the management ozone concentration Ds is insufficient, while the first time t4 lower than the management ozone concentration Ds is obtained. Then, even if the continuation time of the dissolved ozone concentration lower than the management ozone concentration Ds indicated at the time t5-t4 is equal to or longer than the predetermined time T3, if the management ozone concentration Ds is not exceeded, the control device stops the ozone injection and stops the sterilization process. ,in The touch panel 4 performs an erroneous display to discharge the ozone water.

As described above, in the sterilization process S301, when the dissolved ozone concentration is less than the management ozone concentration Ds, the predetermined time T3 is elapsed, and the endoscope 10 as the object to be sterilized cannot be appropriately treated with ozone water. Since the sterilization process is performed, the sterilization process S301 is stopped, and there is no wasted time.

Further, when the sterilization process is suspended, the operator can be prompted to give an error by displaying the error on the touch panel 4 as a display means.

1a‧‧‧ front board

1b‧‧‧ side panels

6‧‧‧Water supply port

12‧‧‧Drainage

13‧‧‧ casters

41‧‧‧Oxygen supply port

70‧‧‧Drainage pipe

71‧‧‧First drain

72‧‧‧Second drain

73‧‧‧Ozone Decomposer

100‧‧‧Endoscope sterilization device (ozone sterilization device)

Claims (10)

An ozone sterilizing apparatus which is an ozone sterilizing apparatus which sterilizes an object to be sterilized by ozone water, and is characterized by comprising: a sterilizing tank for immersing the object to be sterilized in the ozone water; and a discharge pipe; In the sterilizing tank, the object to be sterilized is immersed in the ozone water, and the immersed ozone water is discharged as drainage; and an ozone decomposer is disposed in the discharge pipe to pass the immersed ozone water The ozone in the ozone water is decomposed, and the ozone decomposer is configured to be filled with activated carbon as an ozonolysis product, and the immersed ozone water passes through the ozone decomposer, whereby the ozone in the ozone water The ozone is decomposed in contact with the activated carbon, and the drainage time of the ozone water from the ozone decomposer is measured, and the drainage time is used as a determination index of the activity amount of the activated carbon in the ozone decomposer, and the drainage time is configured. When it takes more than a predetermined time, the display means indicates that the activated carbon in the ozone decomposer must be replaced to urge In other activated carbon. A sterilizing method using the sterilizing method of the ozone sterilizing apparatus according to the first aspect of the patent application, which is a preliminary cleaning process for preparing a sterilizing object located in a sterilizing tank; ozone water generation engineering , which supplies raw water to the sterilization tank, Injecting ozone to generate ozone water having a dissolved ozone concentration equal to or higher than a predetermined ozone concentration; and sterilizing the sterilizing target by the ozone water; and discharging the ozone water having undergone the sterilization discharge. The sterilizing method of claim 2, wherein the preliminary washing engineering system is selectable whether or not to perform. The sterilizing method according to the second aspect of the invention, wherein the ozone water generation project is suspended when the transmittance of the raw water in the ozone water generating process is less than a predetermined transmittance. The sterilizing method according to the second aspect of the invention, wherein the ozone water generation project is suspended when the rate of decrease in the dissolved ozone concentration in the ozone water generating process exceeds a predetermined reduction rate. The sterilizing method according to the second aspect of the invention, wherein the ozone water generation project is suspended when the increase rate of the dissolved ozone concentration in the ozone water generating process does not reach a predetermined increase rate. The sterilizing method according to the second aspect of the invention, wherein in the ozone water generating project, if the ozone concentration is lower than the predetermined ozone concentration even if the ozone injection time elapses for a predetermined time, That is, the aforementioned ozone water generation project is suspended. The sterilizing method according to any one of claims 2 to 7, wherein in the sterilizing process, a management ozone concentration having a value higher than the predetermined ozone concentration is set in accordance with the predetermined ozone concentration, and the The dissolved ozone concentration is controlled to maintain the predetermined ozone concentration or higher, and the sterilization process is stopped when the dissolved ozone concentration is less than the predetermined time for the management of the ozone concentration. The sterilizing method according to any one of the items 4 to 7, wherein the display means is erroneously displayed when the ozone water generating process or the sterilizing process is suspended. The sterilizing method according to the eighth aspect of the invention, wherein the display means is erroneously displayed when the ozone water generating process or the sterilizing process is suspended.