JP3080576U - Petri dish with inner dish and inner dish for petri dish - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the amount of waste after use in a disposable petri dish. SOLUTION: An inner plate 3 is accommodated in an upper plate 1 and a lid 2 is put thereon. The inner plate 3 is formed of a transparent synthetic resin thin plate, and the diameter is continuously reduced from the upper edge 4 to the bottom surface 3.
A tab 6 extends obliquely downward from the upper edge 4.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a petri dish used for culturing microorganisms, and more particularly to a petri dish containing an inner dish made of synthetic resin inside an outer dish and an inner dish used for the same.

[0002]

[Prior art]

 Conventionally, a glass Petri dish composed of a glass dish containing a medium and a glass lid covering the medium has been used for culturing microorganisms. In recent years, disposable petri dishes in which a plate and a lid are formed of a thin plate of a transparent synthetic resin such as polystyrene, sterilized, and packed in a predetermined number of synthetic resin bags instead of a glass Petri dish have become widespread.

[0003]

[Problems to be solved by the invention]

 Glass petri dishes are sterilized by boiling each time they are used, washed, dried, stored in sterilized cans, sterilized by dry heat, and used repeatedly.To reduce the time and labor required for such use, disposable synthetic dishes are used. Resin petri dishes have come to be widely used. However, a petri dish made of a dish and a lid has a volume of about 100 ml and has a diameter of about 90 mm, a height of 15 to 20 mm, and a weight of about 18 g. Overall, it is quite bulky and heavy.

[0004] Used petri dishes often have harmful microorganisms attached to them, so their disposal requires strict management as well as medical waste, and when incinerated they emit harmful gases. However, when the discarded petri dish is bulky or heavy as described above, the cost required for disposal is high.

Further, in the case of a conventional disposable petri dish, a large amount of synthetic resin is discarded each time a test is performed, which is not preferable in terms of effective use of resources. Therefore, an attempt was made to reduce the thickness of the Petri dish to reduce the amount of synthetic resin used. However, when the Petri dish was excessively thinned, it was deformed or damaged during handling, and was not practical.

Therefore, the present invention is a disposable type, which reduces the bulk and weight of waste generated each time a culture test is carried out, thereby reducing costs required for disposal, and at the same time, improving the utilization efficiency of synthetic resin resources. It is.

[0007]

[Means for Solving the Problems]

 The petri dish of the present invention has an outer dish similar to a conventionally used glass or synthetic resin dish, a lid that covers the dish, and an inner dish housed in the outer dish. The inner plate is made of a transparent thin synthetic resin sheet, and its outer diameter is continuously reduced toward the bottom. Overhanging.

[0008]

[Action]

 The inner plate of the above-mentioned petri dish has a smaller diameter at the bottom surface than at the upper edge and can be stacked in close contact with each other, so that it is not bulky. In this state, a predetermined number of inner dishes are stacked and accommodated in a synthetic resin bag, gas-sterilized and sealed, or after sealing, sterilized by electron beam or γ-ray irradiation and supplied to consumers. At the time of the culture test, the consumer opens the bag and removes the inner plate, stacks it on the outer plate, and inoculates the medium with the medium and inoculates the microorganism, or sprays the microorganism and then stores the medium. Cover the lid and incubate the microorganisms in a thermostat.

[0009] In the culture test, it is possible to observe the growth of microorganisms from the surface of the culture medium through the lid in the same manner as a conventional petri dish, and to observe the growth of microorganisms from the bottom of the Petri dish because the inner dish is transparent. it can. After the test is completed, remove the inner dish from the outer dish, remove the medium from the inner dish, separately sterilize by steam, and discard. At that time, the operation of taking out the inner plate from the outer plate can be easily performed by holding the tab with tweezers or the like. The remaining outer dish and lid can be sterilized and reused. When a plastic dish is used for the outer plate and the lid, it is preferable to use a heat-resistant synthetic resin to withstand the temperature of heat sterilization.

[0010]

[Embodiment of the invention]

 In FIG. 1, reference numeral 1 denotes an outer plate, and 2 denotes a lid, which are the same as a conventional glass or plastic dish. Reference numeral 3 denotes an inner plate formed of a transparent synthetic resin thin plate. The diameter d of the upper edge 4 is slightly smaller than the inner diameter D of the outer plate 1, and the diameter is continuously reduced from the upper edge 4 to the bottom surface 5. I have. As a result, the inner plate 3 can be compactly stacked as shown in FIG. A tab 6 extends obliquely downward from a part of the upper edge 4 of the inner plate 3.

At the time of the culture test, as shown in FIG. 3, the inner plate 3 is placed on the outer plate 1, the medium 7 is put in the inner plate 3, inoculated with microorganisms, covered with the lid 2, and cultured in a thermostat. As described above, since the inner plate 3 is used in a state of being superposed on the outer plate 1, it can be sufficiently used even if its thickness is small and rigidity is low. When the cover 2 is put on, the tab 6 is sandwiched between the outer peripheral surface of the outer plate 1 and the inner peripheral surface of the lid 2. During the test, remove the chalet from the thermostat at any time, and observe the growth status of microorganisms from the top and bottom surfaces.

After the test, the inner plate 3 can be easily removed from the outer plate 1 by removing the lid 2 and pulling up the tab 6 with tweezers. The medium is peeled off from the inner plate 3, and the inner plate 3 and the medium are separately steam-sterilized and then discarded separately. At the time of disposal, the inner plates 3 are stacked as shown in FIG. Synthetic resin such as polystyrene having high transparency deforms when heated to around 70 ° C. or higher. However, in the above-mentioned steam sterilization, the inner plate 3 may be slightly deformed. The remaining outer dish 1 and lid 2 can be subjected to dry heat sterilization as long as there is no visible contamination, and can be used repeatedly.

Here, since the inner plate 3 hardly requires mechanical strength, even if the inner plate 3 has a diameter of about 90 mm and a height of about 12 mm, the wall thickness is about 0.3 mm and the weight is about 1 g. Thus, the amount of synthetic resin required is only about one tenth to one fifteenth of that of a conventional disposable synthetic resin chassis. Therefore, the efficiency of resource utilization is much better than conventional disposable petri dishes.

A medium is stored in each inner plate 3 in advance, and an appropriate number is stacked in a manner shown in FIG. 2 with a separator such as a synthetic resin film interposed therebetween, and stored in a closed container under aseptic conditions. May be provided to the consumer.

[0015]

[Effect of the invention]

 As is clear from the above description, according to the present invention, it is possible to realize a petri dish that is easy to handle because it is not bulky, easy to dispose after use, and contributes to effective use of resources. it can.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a petri dish of the present invention.

FIG. 2 is a schematic sectional view showing a state in which the inner plates of the petri dish of the present invention are stacked.

FIG. 3 is a schematic cross-sectional view of the petri dish of the present invention during culture.

[Explanation of symbols]

 1 Outer dish 2 Lid 3 Inner dish 4 Inner dish upper edge 5 Inner dish bottom 6 Tab 7 Medium

Claims (6)

[Utility model registration claims] 1. An outer dish and a lid formed of a transparent material, and an inner dish formed of a transparent synthetic resin thin plate, wherein the inner diameter of the upper edge is slightly smaller than the inner diameter of the outer dish. Small and
A Petri dish with an inner plate characterized in that its diameter is continuously reduced as it moves from the upper edge to the bottom. 2. The dish according to claim 1, wherein a tab extends from an upper edge of the inner plate. 3. The tab according to claim 2, wherein the tab is provided between the outer peripheral surface of the outer plate and the inner peripheral surface of the cover when the inner plate is accommodated in the outer plate and the lid is covered. Petri dish with inner plate characterized by being sandwiched. 4. It is formed of a transparent synthetic resin, and its outer diameter is continuously reduced as it moves from the upper edge to the bottom surface.
An inner dish for a petri dish, wherein a tab extends outward from the upper edge, and an outer diameter of the upper edge is selected to be smaller than an inner diameter of a dish of a petri dish used in combination with the tab. 5. The petri dish according to claim 4, wherein a plurality of the petri dishes are sterilized and stacked with an airtight material. 6. The petri dish according to claim 5, wherein each of the petri dishes contains a sterilized medium.