JP4712667B2 - Method of heat sterilization treatment of medical waste - Google Patents

Description

The present invention relates to a heat sterilization treatment how the medical waste, in particular efficiently sterilized by irradiation medical waste microwaves, relates heat sterilization how the medical waste to perform the volume reduction process It is.

  Medical waste is collected in a mixed state of various materials having greatly different dielectric constants such as used gauze, rubber gloves, and disposable diapers. In particular, paper diapers are not bulky because they are bulky and are not easily heated. Therefore, various devices are required to heat sterilize medical waste with microwaves.

  Therefore, as disclosed in Patent Document 1, the applicant of the present invention stores medical waste in which a surfactant is added together with moisture in a sealed container, pressurizes the sealed container, and the medical waste is microwaved. A heat sterilization apparatus for heating medical waste and a sterilization method using the apparatus have been proposed.

  The medical waste heat sterilization apparatus and the sterilization method using this apparatus rapidly heat the medical waste due to heat generated by the surfactant by adding a surfactant to the medical waste. The surface active agent is dispersed and present to heat uniformly, and the thermal decomposition temperature of the surface active agent is used to prevent overheating of the medical waste.

By the way, such a heat sterilization apparatus for medical waste is usually installed in a waste disposal site or the like, and therefore, at the medical waste generation site, it must wait for collection by regular flights. It was necessary to temporarily store the waste.
JP 2006-204374 A

In view of the problems of the conventional medical waste heat sterilization apparatus and the sterilization method using this apparatus, the present invention provides a medical waste that can be heat sterilized at the site where the medical waste is generated. and to provide a heat sterilization treatment how.

In order to achieve the above object, a method for heat sterilization of medical waste according to the present invention includes a pressure container for storing medical waste, a pressurizing device for pressurizing the inside of the pressure container, and microwave heating the medical waste. A heat sterilizer equipped with a microwave oscillator is installed on the loading platform of the vehicle, and the vehicle is moved to a medical waste generation site, where the medical waste is heat sterilized. A method for heat sterilization treatment of medical waste, wherein a recovery container with a lid having a high-pressure steam heat-resistant plastic bag as an inner bag is installed at a medical waste generation site, and the inner bag of the recovery container After injecting medical waste into the inner bag, the inner bag is sprayed with a disinfectant surfactant, and the inner bag is ruptured due to thermal expansion by binding the mouth of the inner bag with a binding band with a fixed fastening circumference. Inner bag with a gap to prevent Closed and the collection container and placed in a heated sterilizer in the lid closed, and performing heat sterilization of medical waste.

In this case, a compression / volume reduction device that compresses and reduces the volume of medical waste that has been heat sterilized is installed in the loading platform of the vehicle, and after the medical waste is heat sterilized, the inner bag and its contents are recovered with a lid. It can be removed from the container and compressed using a compression volume reduction device to reduce the volume.

According to the heat sterilization process how of medical waste of the present invention, without having to store the medical waste waiting for a recovery by regular flights, local, for example, in infectious diseases occur medical institutions, as soon as possible of medical waste Heat sterilization can be performed. And since the heat sterilization process of medical waste can be performed on-site, the risk when medical waste is scattered or lost due to an accident or the like during transportation can be reduced.

Then, set up a lidded collection container that the inner bag of plastic bags of the high-pressure steam heat to generate site medical waste, after switching on the medical waste in the inner the bag該回container, disinfecting the inside the inner bag By spraying the surfactant, the inner bag is closed, and the collection container is put into a heat sterilizer with the lid closed, and the medical waste is heat sterilized, thereby disinfection and double sealing. In addition to preventing infection, medical waste can be heat sterilized with a rapid increase in temperature by the sprayed surfactant.

In particular, the inner bag is closed by binding the mouth of the inner bag with a bundling band with a fixed tightening circumference so that the inner bag has a gap to prevent rupture due to thermal expansion, and the collection container is closed with the lid closed. In a heated sterilizer, the medical waste is heat sterilized to easily close the inner bag to prevent nosocomial infection and to prevent the inner bag from bursting due to heat expansion. in stable it can be provided, while suppressing the steam leakage from the bladder, it is possible to prevent the rupture of the inner bag during sterilization.

In addition, a compression / volume reduction device that compresses and reduces heat-sterilized medical waste on the vehicle bed is used. After heat-sterilizing medical waste, the inner bag and its contents are compressed and reduced. by volume, the collection of medical waste, can streamline the transfer, that with reducing CO ₂ emissions of the vehicle, to move quickly to the next generation site, to heat sterilize medical waste in a short time Can do. Furthermore, the collection container with a lid used at the medical waste generation site can be reused as it is at the medical waste generation site.

Hereinafter, an embodiment of heat sterilization how the medical waste of the present invention will be described with reference to the drawings.

1 to 3 show an embodiment of an apparatus for carrying out the heat sterilization method for medical waste according to the present invention.
The medical waste heat sterilization apparatus includes a pressure vessel 1 for storing medical waste, a pressurizing device (not shown) for pressurizing the inside of the pressure vessel 1, and a microwave oscillator for microwave heating the medical waste. 2 and the heat sterilizer 3 is installed on a loading platform 41 of a vehicle 4 such as a wing car.

In this embodiment, the pressure vessel 1 is a horizontally-placed cylindrical type made of a steel plate having an internal volume of about 0.5 m ³ , and has a maximum use temperature of about 150 ° C. and a maximum use pressure of about 0.3 Mpa. Yes.
A hatch-shaped opening / closing door 5 is provided at the front portion of the pressure vessel 1, and the opening / closing door 5 can be opened / closed by an opening / closing cylinder 6 and locked by a lock cylinder 7.
A microwave oscillator 2, a temperature sensor 8, a safety valve 9, an exhaust valve 10, and a pressurization supply valve 11 are provided on the upper portion of the pressure vessel 1.
A pressurizing device (not shown) such as a compressor is connected to the pressurizing supply valve 11, and an exhaust deodorizing unit 12 is connected to the exhaust valve 10.

On the other hand, the pressure vessel 1 and the microwave oscillator 2 are fixed to the loading platform 41 of the vehicle 4 via a vibration-proof mount 13 in which air 13a is sealed in a room partitioned by a rubber elastic body.
This anti-vibration mount 13 attenuates low-frequency vibrations by air 13a enclosed in a rubber elastic body, and protects the microwave oscillator 2 mounted via the pressure vessel 1 from vibrations caused by running of the vehicle 4. is doing.

Further, as shown in FIG. 1, a compression / volume reduction device 14 that compresses and reduces the volume of medical waste A heat-sterilized by the heat sterilizer 3 is attached to the loading platform 41 of the vehicle 4.
The compression / volume reduction device 14 compresses the medical waste A by inserting the medical waste A into a receiving container 15 such as a drum can and inserting a press disk 14a into the receiving container 15 by a hydraulic cylinder 14b. Shred and reduce the volume.
Thereby, the volume of medical waste A is reduced to 1/3 to 1/5.

By the way, in the heat sterilization treatment method for medical waste of this embodiment, as shown in FIG. 4, a recovery container 17 with a lid having a high pressure steam heat resistant plastic bag of 150 to 160 ° C. as an inner bag 16 is disposed of the medical waste. It is installed at the site of occurrence, and the discharger puts medical waste into the inner bag 16 of the collection container 17.
When the discharger uses the collection container 17, the collection container 17 is put on a wagon 18 provided with another stepping open / close lid 18 a, and is opened and closed by the wagon lid 18 a.
Then, at the stage where the amount of the injected medical waste reaches a predetermined amount, a disinfecting surfactant (for example, Tego (registered trademark) 51) is sprayed into the inner bag 16 to close the inner bag 16. When there are many types of waste, in order to supplement the water | moisture content which a waste has, about 500 mL disinfecting surfactant is sprayed in the collection | recovery container 17 with a capacity | capacitance of 40-50L, for example.

In this case, the inner bag 16 is closed with a gap provided to prevent rupture due to heat expansion.
Specifically, as shown in FIG. 5, a binding band 19 in which a protrusion 20 is provided with an adhesive or the like to limit the tightening circumference, specifically, a binding band made of a synthetic resin such as Insulok (trade name) is used. For example, the mouth of the inner bag 16 is bundled with a circumference of about 6 cm (the circumference can be changed depending on the type of contents, container capacity, etc.).
When the gap between the inner bags 16 is larger than this, steam leakage from the inner bag 16 increases, and when it is smaller, bursting due to heat expansion tends to occur.
As shown in FIG. 5, the binding band 19 includes an engaging claw 19b inside the head insertion portion 19a, and a latch 19d formed on the band portion 19c is engaged with the engaging claw 19b. The band part 19c is fixed. The band portion 19c normally enters as many as possible in the insertion direction, but is prevented from entering by the protrusion 20 and can hold the mouth of the inner bag 16 with a constant circumference.
As described above, after the mouth of the inner bag 16 is bound, the lid 17a of the collection container 17 is closed, and the lid 17a is put into the heat sterilizer 3 as it is to heat sterilize the medical waste. In the present embodiment, the three recovery containers 17 can be heat sterilized at the same time.

After the heat sterilization process, the collection container 17 is fitted with a new inner bag 16 and returned to the site. Only the heat-sterilized inner bag 16 and its contents are reduced in volume by the compression / volume reduction device 14, and finally. Can be used as a cement raw material or the like after being melt-treated by electric furnace melting or incineration (see Japanese Patent Laid-Open No. 4-13031).
In the compression volume reduction device 14, by volume reduction of the medical waste to 1 / 3-1 / 5, the collection of medical waste, the transport can streamline, as well as reduce the CO ₂ emissions of the vehicle 4, the following The medical waste can be quickly sterilized by heating in a short time.

Next, an example of the operation method of the heat sterilization apparatus of the present embodiment will be described.
The vehicle 4 is moved to the medical waste generation site, and the medical waste is put into the heat sterilizer 3 together with the collection container 17.
The microwave oscillator 2 is energized and sterilized by heating (fully automatic operation).
After reaching a temperature of 100 ° C. in about 1 to 2 minutes, the inside of the pressure vessel 1 is pressurized by a pressurizing device (not shown).
After reaching a temperature of 135 ° C. in about 2 to 3 minutes, the microwave oscillator 2 is intermittently operated.
After 5 minutes or more have passed, the data is recorded and stored, and the air is exhausted. For example, the exhaust gas is deodorized at a set combustion temperature of 400 ° C. by a platinum honeycomb catalyst.
Deodorization is completed in about 1 to 2 minutes, and sterilization of medical waste is completed.
After completion of sterilization, data such as pressure, temperature, and time are stored in an attached recording medium such as an SD card for each lot.

Thus, heat sterilization how the medical waste in this embodiment, the micro-pressure vessel 1 for containing medical waste, pressurizing the pressure vessel 1 pressurizing unit (not shown), the medical waste A heat sterilizer 3 equipped with a microwave oscillator 2 that performs microwave heating is installed on a loading platform 41 of a vehicle 4, the vehicle 4 is moved to a medical waste generation site, and the medical waste is heat sterilized at the generation site. Therefore, it is possible to quickly heat sterilize medical waste in the local area, for example, infectious disease medical institutions without waiting for collection by regular flights and storing medical waste as in the past. it can. And since the heat sterilization process of medical waste can be performed on-site, the risk when medical waste is scattered or lost due to an accident or the like during transportation can be reduced.

  Further, by fixing the pressure vessel 1 and the microwave oscillator 2 to the loading platform 41 of the vehicle 4 through a vibration-proof mount 13 in which a gas is enclosed in a chamber partitioned by a rubber elastic body, the microwave oscillator 2 that is vulnerable to vibration is provided. Internal damage can be prevented and problems such as inability to start can be prevented.

  In addition, a collection container 17 with a lid made of a high-pressure steam heat-resistant plastic bag as an inner bag 16 is installed at a medical waste generation site, and after the medical waste is put into the inner bag 16 of the recovery container 17, the inner bag 16 by spraying a disinfectant surfactant into the inner bag 16 to close the inner bag 16 and putting the collection container 17 into the heat sterilizer 3 with the lid 17a closed to perform heat sterilization treatment of the medical waste. In addition to preventing hospital infection by disinfection and double sealing, medical waste can be heat sterilized with a rapid increase in temperature by the sprayed surfactant.

In addition, a compression / volume reduction device 14 for compressing and reducing heat-sterilized medical waste is provided on the loading platform 41 of the vehicle 4. After heat-sterilizing the medical waste, the inner bag 16 and its contents are by volume reduced by compression, the collection of medical waste, the transport can streamline, as well as reduce the CO ₂ emissions of the vehicle 4, and moves quickly to the next generation site, in a short time medical waste It can be heat sterilized. Furthermore, the collection container 17 with a lid used at the medical waste generation site can be reused as it is at the medical waste generation site.

  Further, by providing the inner bag 16 with a gap for preventing rupture due to thermal expansion, it is possible to prevent rupture of the inner bag 16 during sterilization while suppressing vapor leakage from the inner bag 16.

  In addition, by binding the mouth of the inner bag 16 with a binding band 19 having a fixed fastening circumference, the inner bag 16 can be easily closed to prevent nosocomial infections, and a plurality of gaps to prevent rupture due to thermal expansion are provided. The inner bag 16 can be provided stably.

Although the heat sterilization treatment how the medical waste of the present invention have been described based on the embodiments, the present invention is not limited to the configuration described in the above examples were described in Example Configuration The configuration can be changed as appropriate without departing from the spirit of the invention, for example, by appropriately combining the two.
In addition, medical waste in this specification includes medical facilities such as hospitals, laboratories that handle heat-resistant bacteria, HIV (AIDS virus), HBV (hepatitis virus), viruses such as avian influenza and O157, This includes waste from general areas that may have been contaminated with bacteria.

Heat sterilization how to process medical waste of the present invention, because it has a characteristic that carried out the heat sterilization treatment of medical waste generated site, to store medical waste waiting for a recovery by regular flights In addition, it can be suitably used for applications in which medical waste is quickly sterilized by heating on site.

It is a side view which shows one Example of the apparatus which enforces the heat sterilization processing method of the medical waste of this invention. It is a perspective view which shows the heat sterilizer of the same heat sterilization processing apparatus. The heat sterilizer is shown, (a) is a front view thereof, (b) is a side view thereof, (c) is a plan view thereof, and (d) is an enlarged view of an anti-vibration mount. The collection container is shown, (a) is a perspective view showing a state at the time of charging medical waste, (b) is a perspective view showing a state where the inner bag is closed with a binding band. It is sectional drawing which shows an example of a binding band.

DESCRIPTION OF SYMBOLS 1 Pressure vessel 2 Microwave oscillator 3 Heating sterilizer 4 Vehicle 41 Loading platform 5 Opening and closing door 6 Opening and closing cylinder 7 Lock cylinder 8 Temperature sensor 9 Safety valve 10 Exhaust valve 11 Pressurization supply valve 12 Exhaust deodorizing unit 13 Anti-vibration mount 14 Compression reduction Container 14a Press disc 14b Hydraulic cylinder 15 Receiving container 16 Inner bag 17 Collection container 17a Lid 18 Wagon 18a Wagon lid 19 Binding band 19a Head insertion part 19b Engaging claw 19c Band part 19d Latch 20 Protrusion

Claims (2)

A heat sterilizer equipped with a pressure container for storing medical waste, a pressurizing device for pressurizing the inside of the pressure container, and a microwave oscillator for microwave heating of the medical waste is installed on the loading platform of the vehicle. a heating sterilizer, the vehicle is moved to the occurrence site of medical waste, a heat sterilization method of medical waste to perform heat sterilization of the medical waste by emitting raw situ, high-pressure steam heat A collection container with a lid with a plastic bag as an inner bag is installed at the site where medical waste is generated, and after the medical waste is put into the inner bag of the recovery container, a disinfectant surfactant is sprayed into the inner bag. Then, by closing the inner bag mouth with a binding band with a fixed tightening circumference, the inner bag is closed so as to prevent the inner bag from bursting due to thermal expansion, and the collection container is closed with the lid closed. In a heated sterilizer Heat sterilization method of medical waste which is characterized in that the heat sterilization treatment of wastes. A compression and volume reduction device that compresses and reduces the volume of medical waste that has been heat sterilized is mounted on the carrier of the vehicle, and after medical waste has been heat sterilized, the inner bag and its contents are removed from the collection container with the lid, heat sterilization treatment method according to claim 1 medical waste according to, characterized in that volume reduction is compressed using a compression volume reduction device.

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