High-density biological sample storage box

Abstract

The utility model discloses a high-density biological sample storage box which comprises a sample box body, a plurality of groups of storage holes are formed in the sample box body, and limiting pieces are arranged on the inner walls of the storage holes in the radial direction in an outward extending mode. The utility model has the beneficial effects that the limiting piece can be in a point shape or a vertical strip shape, reduces the contact surface of the sample tube and the inner wall, is in point-shaped or linear contact connection, reduces the frosting area of the sample tube and the inner wall, and improves the sample tube extraction efficiency; through the arrangement of a butt joint hole A and a butt joint hole B, the sample box body can be pried to be separated from the frozen position through the butt joint hole A and the butt joint hole B manually or through a tool, and the efficiency of extracting the sample box is improved; due to the arrangement of the guide areas and the three guide areas arranged in the circumferential direction above the hole wall of the storage hole, the sample tube can smoothly enter the storage hole through the guide areas in the storage process under the condition that the inner diameter of the sample tube is not larger than half of the inner diameter of the sample tube, the situation that the sample tube cannot be stored due to misalignment of the sample tube and the storage hole is avoided, and the sample storage efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sample storage, in particular to a high-density biological sample storage box. Background Art

[0002] A biobank is an entity that effectively collects, organizes, stores and distributes biological samples, which is of great significance and value to life science research. The storage of biological samples is an important part of this process. The storage of biological samples often uses the lowest possible temperature to reduce the biochemical reactions in the samples. Currently, samples are often stored in cryopreservation boxes.

[0003] The construction of a sample library requires high costs, including the need for tens of thousands of cryoboxes. Traditional cryoboxes have multiple regular arrays of round or square holes inside, and the number of sample cryotubes that can be stored is limited, resulting in low storage efficiency, leading to high costs for the construction of the sample library.

[0004] In the sample boxes currently in use, the storage holes are tightly fitted with the sample tubes. In low-temperature environments, frost is prone to occur, resulting in the inability to successfully grab the sample tubes; and the sample box body may also freeze, resulting in failure in the automated grabbing of the sample box; the existing sample boxes have low sample storage efficiency, for this reason, the inventor has designed a high-density biological sample storage box. Utility Model Content

[0005] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] In view of the above problems or problems existing in the prior art, the present utility model is proposed.

[0007] Therefore, the purpose of the utility model is to provide a high-density biological sample storage box, which can store sample tubes at a high density, and the sample tubes can be partially contacted by the limiting piece in the storage hole to avoid the sample tubes from being in close contact with the storage hole as a whole, thereby reducing the contact area, and avoiding the sample tubes and the storage holes from being frosted as a whole under low temperature conditions, resulting in the failure to grab the sample tubes; when the sample box body is frozen to the bottom platform due to frost, the sample box can be separated from the bottom platform by manual or tool docking A hole or docking B hole to release the frosted state.

[0008] To solve the above technical problems, the present utility model provides the following technical solutions: A high-density biological sample storage box, which includes a sample box body. Multiple groups of storage holes are provided on the sample box body, and a limiting member is radially extended outward on the inner wall of the storage hole.

[0009] As a preferred solution of the high-density biological sample storage box of the present utility model, wherein: the limiting member is a strip-shaped structure with a certain thickness provided on the inner wall of the storage hole.

[0010] As a preferred solution of the high-density biological sample storage box of the present utility model, wherein: the limiting member is a plurality of dot-shaped structures protruding radially on the inner wall of the storage hole. The dot-shaped structures can be arranged in a vertical array, arranged irregularly, or arranged in a horizontal array.

[0011] As a preferred solution of the high-density biological sample storage box of the present utility model, wherein: the storage holes are arranged in a honeycomb pattern. A hole wall is formed between adjacent two storage holes. A guiding area is recessed downward at the upper end of the hole wall. The guiding area has a lowest area recessed in the middle, and is formed by gradually and smoothly transitioning upward from the middle to both sides.

[0012] As a preferred solution of the high-density biological sample storage box of the present utility model, wherein: the guiding area is in the shape of an inverted isosceles trapezoid, and each storage hole is provided with three guiding areas.

[0013] As a preferred solution of the high-density biological sample storage box of the present utility model, wherein: it further includes at least a pair of docking A holes, and the docking A holes are opened on one side of the lower end of the sample box body.

[0014] As a preferred solution of the high-density biological sample storage box of the present utility model, wherein: it further includes at least a pair of docking B holes, and the docking B holes are opened on the other side adjacent to the side where the docking A holes are opened at the lower end of the sample box body.

[0015] As a preferred solution of the high-density biological sample storage box of the present utility model, wherein: it further includes at least a pair of docking C holes, and the docking C holes are opened on the other side of the lower end of the sample box body opposite to the side of the docking A holes or / and the docking B holes.

[0016] As a preferred solution of the high-density biological sample storage box of the present utility model, wherein: it further includes a blocking member, and the blocking member is a block-shaped structure with a certain thickness provided at the lower end inside the storage hole.

[0017] As a preferred solution of the high-density biological sample storage box of the present utility model, wherein: symmetric inclined sliding surfaces are formed on both sides of the upper end of the blocking member, and the two inclined sliding surfaces gradually expand from near to far relative to each other from top to bottom along the symmetric center line; and it forms a triangular shape with a smooth surface.

[0018] As a preferred embodiment of the high-density biological sample storage box of the present utility model, wherein: a vertical first sliding surface is formed at the lower part of the blocking member connected to the inclined sliding surface.

[0019] As a preferred embodiment of the high-density biological sample storage box of the present utility model, wherein: a sample tube can be stored in the storage hole, and a blocking and cooperating member is arranged at the bottom of the sample tube; symmetrically arranged inverted inclined sliding surfaces are formed on both sides at the lower end of the blocking and cooperating member, and the two inverted inclined sliding surfaces gradually expand from near to far relative to each other along the symmetry center line from bottom to top, and a shape similar to a smooth inverted triangular body is formed;

[0020] A vertical second sliding surface is formed at the upper end of the blocking and cooperating member connected to the inverted inclined sliding surface. The blocking member is in sliding contact with the inverted inclined sliding surface on the blocking and cooperating member through the inclined sliding surface to limit the speed of the sample tube, and the blocking member can limit and support the sample tube.

[0021] As a preferred embodiment of the high-density biological sample storage box of the present utility model, wherein: a guiding slope is arranged above the limiting member, and the guiding slope is arranged as an inverted conical inclined surface.

[0022] Advantages of the present utility model: 1. With the setting of the guiding area, three guiding areas are circumferentially arranged above the inner wall of the storage hole, in the shape of an isosceles trapezoid. During the storage process of the sample tube, as long as it does not exceed half of the inner diameter of the sample tube, it can smoothly enter the storage hole through the guiding area, and there will be no situation where the sample tube cannot be stored due to misalignment with the storage hole, improving the sample storage efficiency;

[0023] 2. The limiting member can be in a dot shape or a vertical strip shape, reducing the contact area between the sample tube and the inner wall, only in dot or line contact connection, reducing the frosting area between the sample tube and the inner wall, and improving the efficiency of extracting the sample tube;

[0024] 3. With the setting of the docking hole A and the docking hole B, which are located at the bottom of one end of the length and width side walls of the sample box, to prevent the sample box from being frozen to the bottom platform due to frosting, making it inconvenient to extract the sample box. The sample box body can be pried away from the frozen position through the docking hole A and the docking B by manual or tool, improving the efficiency of extracting the sample box;

[0025] 4. With the setting of the blocking member, which is used to limit the position of the sample tube, an inclined sliding surface is formed at its upper end, which can contact the blocking and cooperating member on the sample tube to slow down the descending speed of the sample tube, and the blocking member can support the sample tube, and the cooperation between the blocking member and the blocking and cooperating member can play a role in correcting the sample tube.

[0026] 5. A blocking and cooperating member is arranged on the sample tube, and an inverted inclined sliding surface is arranged on the blocking and cooperating member. By contacting the inclined sliding surface on the blocking member through the inverted inclined sliding surface, it can fit and slowly descend until the blocking member supports the sample tube. Description of the Drawings

[0027] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0028] Figure 1 Schematic diagram of 138 storage holes of the overall high-density biological sample storage box.

[0029] Figure 2 For Figure 1 Enlarged view at F1 of the high-density biological sample storage box.

[0030] Figure 3 Schematic perspective view of the high-density biological sample storage box.

[0031] Figure 4 For Figure 3 Schematic diagram at F3 of the high-density biological sample storage box.

[0032] Figure 5 Another perspective schematic perspective view of the high-density biological sample storage box.

[0033] Figure 6 For Figure 5 Enlarged schematic view at F4 of the high-density biological sample storage box.

[0034] Figure 7 Bottom-up schematic perspective view of the high-density biological sample storage box.

[0035] Figure 8 For Figure 7 Enlarged view at F2 of the high-density biological sample storage box.

[0036] Figure 9 Schematic perspective view of the cross-section of the storage hole of the high-density biological sample storage box.

[0037] Figure 10 Schematic diagram of 60 storage holes of the overall high-density biological sample storage box.

[0038] Mark the drawings: sample box body, 1; storage hole; 2; limiting member, 3; guiding area, 4; docking hole A, 5; docking hole B, 6; blocking member, 7; first sliding surface, 8; sample tube, 9; blocking and cooperating member 10; second sliding surface, 11; guiding slope, 12; Specific embodiments

[0039] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the following will describe the specific embodiments of the present utility model in detail with reference to the drawings in the specification.

[0040] In the following description, many specific details are set forth in order to provide a thorough understanding of the present utility model. However, the present utility model may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0041] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation manner of the present utility model. The "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is separate or selectively mutually exclusive with other embodiments. Embodiment 1

[0042] Referring to Figures 1-4 , this is the first embodiment of the present utility model. This embodiment provides a high-density biological sample storage box, which includes a sample box body 1. A plurality of storage holes 2 are opened on the sample box body 1, and a limiting member 3 is arranged in the storage hole 2.

[0043] Preferably, the limiting member 3 can limit the sample tube 9 in the storage hole 2. While preventing shaking, it can also use the limiting member 3 to reduce the contact area between the sample tube 9 and the storage hole 2. Since both the sample box body 1 and the sample tube 9 are in a low-temperature environment, frost is likely to form, and it is easy to fail to grasp during access. The limiting member 3 in our technical solution can solve the situation where the sample tube 9 cannot be grasped due to frost.

[0044] Currently, the sample boxes in use all store the sample tubes directly in contact with the storage holes. This causes a large contact area between the sample tube and the storage hole when frost forms, which also means a large frost area. At this time, it is very easy to fail to grasp the sample tube, while our technical solution can completely overcome this problem.

[0045] In summary, the present utility model opens a plurality of groups of storage holes 2 on the sample box body 1, and the limiting member 3 in the storage hole 2 can be used to reduce the contact area between the sample tube 9 and the storage hole 2, thereby reducing the frost area, making it more convenient and fast to store the sample tube, and improving the storage efficiency. Embodiment 2

[0046] Referring to Figures 1-9 , this is the second embodiment of the present utility model. Based on Embodiment 1, the high-density biological sample storage box further includes that the limiting member 3 is a strip-shaped structure with a certain thickness arranged on the inner wall of the storage hole 2.

[0047] Preferably, the strip structure can be a vertical strip, a curved strip, or a circumferentially wound strip. There is no limitation on the strip structure here, as long as it can have a certain thickness within the storage hole 2, which can reduce the contact area between the sample tube 9 and the storage hole 2, thereby reducing the frost-like area and achieving the purpose of quickly grasping the sample tube 9.

[0048] Furthermore, the limiting member 3 is a plurality of dot-like structures protruding radially on the inner wall of the storage hole 2. The dot-like structures can be arranged in a vertical array, irregularly, or in a horizontal array.

[0049] Preferably, the dot-like structures can be circular, elliptical, polygonal, etc., and are smooth protrusions. These dot-like protrusions can be evenly distributed, horizontally distributed, or irregularly distributed on the inner wall of the storage hole 2. The main purpose of these smooth dot-like protrusions is to reduce the contact area between the sample tube 9 and the inner wall of the storage hole 2, thereby reducing the frost-like area and achieving the purpose of quickly grasping the sample tube 9.

[0050] Furthermore, the storage holes 2 are arranged in a honeycomb pattern. A hole wall is formed between adjacent pairs of storage holes 2. A guiding area 4 is recessed downward at the upper end of the hole wall. The guiding area 4 has a lowest area recessed in the middle and is formed to gradually and smoothly extend upward from the middle to both sides.

[0051] Preferably, through the setting of the guiding area 4, three guiding areas 4 are provided circumferentially above the storage hole 2, in the shape of an isosceles trapezoid. During the storage process of the sample tube, as long as it does not exceed half of the inner diameter of the sample tube, it can smoothly enter the storage hole 2 through the guiding area 4, and there will be no situation where the sample tube cannot be stored due to misalignment with the storage hole 2, improving the sample storage efficiency.

[0052] Furthermore, the guiding area 4 is in the shape of an inverted isosceles trapezoid, and each storage hole 2 is provided with three guiding areas 4.

[0053] Preferably, through the setting of the guiding area 4, it is more convenient and fast to access the sample tube, reducing the operation time and improving the storage efficiency.

[0054] Furthermore, it further includes at least one pair of docking holes A 5, which are opened on one side of the lower end of the sample box body 1.

[0055] Furthermore, it further includes at least one pair of docking holes B 6, which are opened on the other side adjacent to the side where the docking holes A 5 are opened at the lower end of the sample box body 1.

[0056] Furthermore, it further includes at least one pair of docking holes C, which are opened on the other side of the lower end of the sample box body 1 opposite to the side of the docking holes A 5 or / and the docking holes B 6.

[0057] Preferably, the docking hole A and the docking hole B are arranged at the bottom end of one side of the length and width of the sample box, preventing the sample box from freezing to the bottom platform due to frosting, which is inconvenient to extract the sample box. The sample box body can be pried away from the frozen position through the docking hole A and the docking hole B by manual or tools, improving the efficiency of extracting the sample box;

[0058] Preferably, through the arrangement of the docking hole A, the docking hole B, and the docking hole C, the periphery of the sample box body 1 can be pried by tools, enabling it to break away from the frozen bottom platform. In this way, the tool can be used to pry from any side of the sample box body 1.

[0059] Furthermore, it further includes a blocking member 7, and the blocking member 7 is a block-like structure with a certain thickness arranged at the lower end inside the storage hole 2.

[0060] Preferably, the sample tube 9 can be blocked by the blocking member 7, and at the same time, it can also play a supporting role.

[0061] Preferably, the block-like structure is arranged below the limiting member 3, and the thickness of the block-like structure is greater than that of the limiting member 3.

[0062] Preferably, the upper and lower ends of the sample tube 9 are provided with a mating block structure. The block-like structure can cooperate with the mating block structure, so that the blocking member 7 contacts the mating block structure on the sample tube 9, causing the sample tube 9 to slowly descend.

[0063] Preferably, the blocking and mating member 10 is a mating block structure with a certain thickness, and the mating block structure can cooperate when contacting the block-like structure, enabling the sample tube 9 to slowly decelerate; preventing the sample tube 9 from directly descending from top to bottom without any buffer, which may cause damage to the sample inside the sample tube 9.

[0064] Furthermore, on both sides of the upper end of the blocking member 7, symmetric inclined sliding surfaces are formed. The two inclined sliding surfaces gradually expand from near to far relative to each other along the symmetric center line from top to bottom; and it forms a triangular body shape with a smooth surface.

[0065] Preferably, on both sides of the upper end of the blocking member 7, symmetric inclined sliding surfaces are formed. The two inclined sliding surfaces gradually expand from near to far relative to each other along the symmetric center line from top to bottom, realizing the change from narrow to wide of the two inclined sliding surfaces.

[0066] Furthermore, a vertical first sliding surface 8 is formed at the lower part of the blocking member 7 connected to the inclined sliding surface.

[0067] Furthermore, the sample tube 9 can be stored in the storage hole 2, and a blocking and mating member 10 is arranged at the bottom of the sample tube 9; on both sides of the lower end of the blocking and mating member 10, symmetric inverted inclined sliding surfaces are formed. The two inverted inclined sliding surfaces gradually expand from near to far relative to each other along the symmetric center line from bottom to top, and it forms an inverted triangular body shape with a smooth surface;

[0068] Preferably, the blocking fitting 10 and the blocking member 7 are set to have the same shape. The difference is that the blocking fitting 10 is the shape of the blocking member 7 after rotating 180 degrees. Therefore, the upper part of the blocking member 7 is in the shape of a smooth triangular body, while the lower part of the blocking fitting 10 is in the shape of an inverted triangular body.

[0069] A vertical second sliding surface 11 is formed at the upper end of the blocking fitting 10 where it is connected to the inverted inclined sliding surface. The blocking member 7 is in sliding fit with the inverted inclined sliding surface on the blocking fitting 10 through the inclined sliding surface to limit the speed of the sample tube 9, and the blocking member 7 can limit and support the sample tube 9.

[0070] Preferably, when the sample tube 9 descends, it drives the blocking fitting 10 to descend at the same time. The inverted inclined sliding surface at the lower end of the blocking fitting 10 will contact the inclined sliding surface on the blocking member 7, and during the sliding down process, due to the cooperating inverted inclined sliding surface and inclined sliding surface, it will be subject to a certain resistance and descend slowly, so that the sample tube 9 can descend slowly until the blocking member 7 resists and supports the bottom of the sample tube.

[0071] Furthermore, a guiding slope 12 is provided above the limiting member 3, and the guiding slope 12 is set as an inverted conical inclined surface.

[0072] Preferably, through the setting of the guiding slope 12, the sample tube 9 can smoothly enter into the multiple groups of limiting members 3, so as to limit the contact of the sample tube 9 through the limiting members 3.

[0073] It should be noted that, referring to Figures 1-9 ; the number of storage holes 2 opened on the sample box body 1 is 138; 138 sample tubes can be stored;

[0074] It should be noted that, referring to Figure 10 ; the number of storage holes 2 opened on the sample box body 1 is 60; 60 sample tubes can be stored;

[0075] It should be noted that the number of storage holes 2 on the sample box body 1 can also be arbitrarily set according to the requirements of the usage scenario. The specific number of the storage holes 2 is not specifically described here, so as to store the sample tubes more conveniently and with a larger capacity.

[0076] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible without materially departing from the novel teachings and advantages of the subject matter described in this application (for example, the dimensions, scales, structures, shapes, and proportions of various elements, as well as parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, color, orientation changes, etc.). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature, number, or position of discrete elements may be altered or changed. Accordingly, all such modifications are intended to be included within the scope of the present utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means-plus-function" clauses are intended to cover the structures that perform the recited functions described herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes, and omissions may be made in the design, operating conditions, and arrangement of the exemplary embodiments without departing from the scope of the present utility model. Therefore, the present utility model is not limited to specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0077] In addition, in order to provide a concise description of the exemplary embodiments, all features of the actual embodiments may not be described (i.e., those features that are not relevant to the currently considered best mode of implementing the present utility model or those features that are not relevant to the implementation of the present utility model).

[0078] It should be understood that in the development of any actual implementation, in any engineering or design project, a large number of specific implementation decisions may be made. Such development efforts may be complex and time-consuming, but for those of ordinary skill in the art who benefit from this disclosure, without undue experimentation, such development efforts will be a routine task of design, manufacturing, and production.

[0079] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model.

Claims

1. A high-density biological sample storage box, characterized in that: It comprises a sample box body (1), wherein a plurality of groups of storage holes (2) are provided on the sample box body (1), and a limiting member (3) is provided on the inner wall of the storage hole (2) extending outward in a radial direction.

2. The high-density biological sample storage box according to claim 1, wherein: The limiting member (3) is a strip structure with a certain thickness arranged on the inner wall of the storage hole (2).

3. The high-density biological sample storage box according to claim 1, wherein: The limiting member (3) is a plurality of dot-shaped structures protruding in the radial direction on the inner wall of the storage hole (2); the dot-shaped structures can be arranged in a vertical array or in an irregular arrangement, or in a horizontal array.

4. The high-density biological sample storage box according to any one of claims 1-3, characterized in that: The storage holes (2) are arranged in a honeycomb shape, and a hole wall is formed between two adjacent storage holes (2). The upper end of the hole wall is recessed downward to form a guide area (4). The guide area (4) is the lowest area with a recessed middle portion, and is formed in a manner that gradually and smoothly transitions from the middle portion to both sides and extends upward.

5. The high-density biological sample storage box according to claim 4, characterized in that: The guide area (4) is in the shape of an inverted isosceles trapezoid, and each storage hole (2) is provided with three guide areas (4).

6. The high-density biological sample storage box according to any one of claims 1-3, characterized in that: It also comprises at least one docking hole A (5), wherein the docking hole A (5) is opened on one side of the lower end of the sample box body (1).

7. The high-density biological sample storage box according to claim 6, characterized in that: It also comprises at least one docking B hole (6), wherein the docking B hole (6) is provided on the other side of the lower end of the sample box body (1) adjacent to the side on which the docking A hole (5) is provided.

8. The high-density biological sample storage box according to claim 7, characterized in that: It also comprises at least one docking C hole, which is opened on the other side of the lower end of the sample box body (1) opposite to the docking A hole (5) and / or the docking B hole (6).

9. The high-density biological sample storage box according to any one of claims 1 to 3, characterized in that: It also comprises a blocking member (7), which is a block structure having a certain thickness and is arranged at the lower end of the storage hole (2).

10. The high-density biological sample storage box according to claim 9, characterized in that: Symmetrical oblique sliding surfaces are formed on both sides of the upper end of the blocking member (7), and the two oblique sliding surfaces gradually expand from top to bottom and from near to far along the symmetry center line, and form a triangular shape with a smooth surface.

11. The high-density biological sample storage box according to claim 10, characterized in that: The lower part of the blocking member (7) is connected to the inclined sliding surface to form a vertical first sliding surface (8).

12. The high-density biological sample storage box according to claim 11, wherein: The storage hole (2) can store a sample tube (9), and a blocking fitting (10) is provided at the bottom of the sample tube (9); symmetrical inverted inclined sliding surfaces are formed on both sides of the lower end of the blocking fitting (10), and the two inverted inclined sliding surfaces gradually expand from bottom to top and from near to far along the symmetry center line, and form an inverted triangle shape similar to a smooth surface; The upper end of the blocking fitting (10) is connected to the inverted inclined sliding surface to form a vertical second sliding surface (11), and the blocking member (7) limits the speed of the sample tube (9) by sliding in contact with the inverted inclined sliding surface on the blocking fitting (10), and the blocking member (7) can provide position-limiting support for the sample tube (9).

13. The high-density biological sample storage box according to any one of claims 1 to 3, characterized in that: A guide slope (12) is provided above the limiting member (3), and the guide slope (12) is configured as an inverted conical inclined surface.

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