CN117288775A

CN117288775A - Contact lens product, packaging box thereof and detection method

Info

Publication number: CN117288775A
Application number: CN202210691010.9A
Authority: CN
Inventors: 黄逸芳; 陈博钧
Original assignee: Pegavision Corp
Current assignee: Pegavision Corp
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2023-12-26

Abstract

The invention discloses a contact lens product, a packaging box thereof and a detection method. The packing box comprises a containing groove body and a sheet body connected with the containing groove body. The inner surface of the accommodating groove body forms a plurality of optical microstructures. Each optical microstructure has an aspect ratio of 0.01-0.1 so that the accommodating groove body has a first transparency. The accommodating groove body can be used for enabling the corresponding part of the accommodating groove body to have a second transparency which is larger than the first transparency through at least partial contact with a preservation liquid of the optical microstructures. Accordingly, the optical microstructures with similar height-width ratios are formed on the inner surface of the accommodating groove body and are matched with the preservation solution, so that the preservation solution can be changed between the first transparency and the second transparency, and further can be selectively presented according to different conditions.

Description

Contact lens product, packaging box thereof and detection method

Technical Field

The invention relates to a packaging box, in particular to a contact lens product, a packaging box and a detection method thereof.

Background

The prior contact lens product comprises a packaging box and a contact lens arranged in the packaging box, wherein a protrusion for preventing the contact lens from sticking is formed on the inner surface of the packaging box. However, the protrusions of the package do not take into account the optical design and thus do not facilitate the corresponding instrument testing of existing contact lens products (e.g., the protrusions within existing contact lens products are prone to light shadows and thus affect the optical instrument testing).

Accordingly, the present inventors considered that the above-mentioned drawbacks could be improved, and have intensively studied and combined with the application of scientific principles, and finally have proposed an invention which is reasonable in design and effectively improves the above-mentioned drawbacks.

Disclosure of Invention

The embodiment of the invention aims to provide a contact lens product, a packaging box and a detection method thereof, which can effectively improve the defects possibly generated by the prior contact lens product.

The embodiment of the invention discloses a detection method of a contact lens product, which comprises the following steps: a pre-step: providing a packaging box which comprises a containing groove body and a sheet body connected with the containing groove body; the accommodating groove body has a first transparency; a tank body detection step: performing a groove defect detection operation on the accommodating groove body by using an optical detection instrument; and a packaging step: placing a contact lens and a preservation liquid into the accommodating groove body, and sealing the contact lens and the preservation liquid into the accommodating groove body by a sealing layer to jointly form a contact lens product; the storage liquid is in contact with the accommodating groove body, and the accommodating groove body is defined as a wetting area and has a second transparency which is larger than the first transparency; a lens detection step: and performing a lens defect detection operation on the contact lens positioned in the accommodating groove body by using the optical detection instrument.

Preferably, in the packaging step, the storage liquid does not fill the accommodating groove body, so that a bubble is reserved in the accommodating groove body by the contact lens product; the portion of the accommodating groove body contacted by the air bubble is defined as a drying area and has a first transparency.

Preferably, in the lens inspection step, the contact lens is completely immersed in the preserving fluid so that the position of the contact lens corresponds to the wetted area of the receiving well.

Preferably, the inner surface of the accommodating groove forms a plurality of optical microstructures, and each optical microstructure has an aspect ratio of 0.01-0.1.

Preferably, the package is manufactured by an injection molding process, and the material of the package is selected from one of polymethyl methacrylate, polypropylene, polycarbonate, polystyrene, and polyethylene terephthalate.

Embodiments of the present invention also disclose a contact lens product comprising: a packing box comprising a containing groove body and a sheet body connected with the containing groove body; wherein, the inner surface of the containing groove forms a plurality of optical microstructures, and each optical microstructure has an aspect ratio of 0.01-0.1, so that the containing groove has a first transparency; the sealing layer seals the notch of the accommodating groove body so that the sealing layer and the accommodating groove body jointly enclose a closed space; and a contact lens and a preserving fluid, positioned in the enclosed space; the accommodating groove body is immersed into the preservation solution through at least part of the optical microstructures, so that the corresponding part of the accommodating groove body is defined as a wetting area and has a second transparency which is larger than the first transparency.

Preferably, the contact lens product leaves a bubble in the enclosed space, and the accommodating groove body is positioned in the bubble through the parts of the optical microstructures, so that the corresponding parts are defined as a drying area and have first transparency.

Preferably, the plurality of optical microstructures are distributed over more than 70% of the inner surface of the receiving groove.

Preferably, any one of the optical microstructures is in a cone shape, and the plurality of optical microstructures are distributed on the inner surface of the accommodating groove body in a mutually connected mode.

Preferably, the depth of the accommodating groove body is 3-10 mm, and the width of any optical microstructure is 0.01-0.1 mm.

Preferably, the package is of unitary, one-piece construction and the material of the package is selected from one of polymethyl methacrylate, polypropylene, polycarbonate, polystyrene and polyethylene terephthalate.

Preferably, at least one of the plurality of optical microstructures is recessed from an inner surface of the receiving groove.

Preferably, at least one of the plurality of optical microstructures is formed protruding from an inner surface of the receiving groove body.

Preferably, at least one of the plurality of optical microstructures is partially formed recessed from the inner surface of the receiving groove body, and another portion thereof is formed protruding from the inner surface of the receiving groove body.

The embodiment of the invention also discloses a packaging box for a contact lens product, which comprises: the inner surface of the accommodating groove body forms a plurality of optical microstructures; wherein, each optical microstructure has an aspect ratio of 0.01-0.1 so that the accommodating groove body has a first transparency; and a sheet body connected to the accommodating groove body; the accommodating groove body can be used for enabling the corresponding part of the accommodating groove body to have a second transparency which is larger than the first transparency through at least partial contact with a preservation liquid of the optical microstructures.

Preferably, the width of any one of the optical microstructures is between 0.01 mm and 0.1 mm.

Preferably, any one of the optical microstructures is tapered, and the plurality of optical microstructures are distributed over 70% of the inner surface of the accommodating groove body in a mutually connected manner.

Preferably, at least one of the plurality of optical microstructures is recessed or protruding from an inner surface of the receiving groove body.

In summary, according to the method for detecting a contact lens product disclosed in the embodiments of the present invention, the detected accommodating groove body can change between the first transparency and the second transparency through the matching relationship with the preserving fluid, so that the detecting method can perform the groove body detecting step on the accommodating groove body exhibiting the first transparency, and perform the lens detecting step on the contact lens product through the accommodating groove body exhibiting the second transparency, thereby facilitating the full detection by the optical detecting instrument.

Furthermore, the contact lens product and the packaging box thereof disclosed by the embodiment of the invention form a plurality of optical microstructures with similar height-width ratio (for example, 0.01-0.1) on the inner surface of the accommodating groove body, so that the accommodating groove body can pass through the matching relation between the optical microstructures and the preservation solution, and accordingly can change between the first transparency and the second transparency, and further the accommodating groove body selectively presents the first transparency or the second transparency according to different conditions.

For a further understanding of the nature and the technical aspects of the present invention, reference should be made to the following detailed description of the invention and the accompanying drawings, which are included to illustrate and not to limit the scope of the invention.

Drawings

Fig. 1 is a schematic perspective view of a contact lens product according to an embodiment of the present invention.

Fig. 2 is a schematic perspective view of another orientation of a contact lens product according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of fig. 1 along section line III-III.

Fig. 4 is a schematic cross-sectional view of fig. 2 along section line IV-IV.

Fig. 5 is an unsealed schematic view of the contact lens product of fig. 1.

Fig. 6 is a schematic perspective view of a package for a contact lens product according to an embodiment of the present invention.

Fig. 7 is a schematic cross-sectional view of fig. 6 along section line VII-VII.

Fig. 8 is an enlarged schematic view of the region VIII in fig. 7.

Fig. 9 is a flow chart of a method for inspecting a contact lens product according to an embodiment of the invention.

Fig. 10 is a schematic diagram of a tank detection step in fig. 9.

FIG. 11 is a schematic diagram of the lens inspection step in FIG. 9.

Detailed Description

The following specific examples are presented to illustrate the embodiments of the present invention disclosed herein with respect to "contact lens products and packages and methods for testing" and those skilled in the art will appreciate the advantages and effects of the present invention from the disclosure herein. The invention is capable of other and different embodiments and its several details are capable of modifications and various other uses and applications, all of which are obvious from the description, without departing from the spirit of the invention. The drawings of the present invention are merely schematic illustrations, and are not intended to be drawn to actual dimensions. The following embodiments will further illustrate the related art content of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.

It will be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are used primarily to distinguish one element from another element or signal from another signal. In addition, the term "or" as used herein shall include any one or combination of more of the associated listed items as the case may be.

Please refer to fig. 1 to 11, which illustrate an embodiment of the present invention. The present embodiment discloses a contact lens product 100 and a detection method thereof, and for ease of understanding, the contact lens product 100 will be described first, and then the detection method will be described later.

As shown in fig. 1 to 5, the contact lens product 100 comprises a package 1, a sealing layer 2 attached to the package 1, a preserving fluid 4 in the package 1, and a contact lens 3 in the preserving fluid 4. In the present embodiment, the package 1 is described as being matched with the sealing layer 2, the preserving fluid 4 and the contact lens 3, but the present invention is not limited thereto. For example, in other embodiments of the invention not shown, the package 1 may also be applied separately (e.g. vending).

In this embodiment, the package 1 is preferably integrally formed in a single piece, and the package 1 is substantially transparent and may be made of one selected from polymethyl methacrylate (poly (methyl methacrylate), PMMA), polypropylene (PP), polycarbonate (PC), polystyrene (PS) and polyethylene terephthalate (polyethylene terephthalate, PET), but the present invention is not limited thereto. For example, in other embodiments of the invention not shown, the package 1 may be constructed in a multi-piece construction; alternatively, the package 1 may be made of other polymer materials according to design requirements.

In more detail, as shown in fig. 4 and fig. 6 to 8, the package 1 includes a housing groove 11 and a sheet 12 connected to the housing groove 11. The sheet 12 includes a sheet portion 121 surrounding and connected to the accommodating groove 11, a plurality of protruding portions 122 vertically connected to the bottom edge of the sheet portion 121, and a holding portion 123 obliquely connected to one end of the sheet portion 121. The protruding portions 122 are respectively located at the outer sides of the accommodating groove 11, and the height of each protruding portion 122 is smaller than the height of the accommodating groove 11, and the holding portion 123 is located at an end of the sheet portion 121 away from the accommodating groove 11.

Furthermore, the accommodating groove 11 in this embodiment includes an annular section 111 connected to the sheet 12 and an accommodating section 112 connected to the annular section 111. One end of the annular section 111 connected to the sheet 12 is formed with a notch 113, and the accommodating section 112 is substantially hollow and hemispherical (e.g. the outline of the accommodating section 112 is slightly smaller than that of the hemispherical), and the center of the accommodating section 112 is located outside the space surrounded by the accommodating groove 11. That is, the accommodating groove 11 has a depth D ranging from 3 millimeters (mm) to 10 mm, and the depth D is smaller than the diameter of the accommodating section 112, but the invention is not limited thereto.

In another aspect, the outer surface 11a of the accommodating groove 11 is a smooth curved surface, while the inner surface 11b of the accommodating groove 11 is formed with a plurality of optical microstructures 11c, and each optical microstructure 11c has an aspect ratio (H/W) between 0.01 and 0.1, so that the accommodating groove 11 has a first transparency. For example, the width W of any one of the optical microstructures 11c may be between 0.01 mm and 0.1 mm, and the height H of any one of the optical microstructures 11c may be between 0.001 mm and 0.01 mm.

As described above, the optical microstructures 11c distributed on the inner surface 11b have substantially the same size and configuration (e.g. any of the optical microstructures 11c is substantially conical), so that the microstructures with different sizes formed according to the positions of the different regions are not the optical microstructures 11c according to the present embodiment.

Further, the optical microstructures 11c are distributed over 70% of the inner surface 11b of the accommodating groove 11 in the present embodiment, and the optical microstructures 11c are preferably distributed (over 70% of the inner surface 11b of the accommodating groove 11) in a mutually connected manner, but the invention is not limited thereto.

In this embodiment, the optical microstructures 11c may be disposed to extend outwards (or toward the notch 113) at the center of the inner edge of the accommodating section 112 until being distributed over more than 70% of the inner surface 11 b; that is, the optical microstructures 11c may be distributed only on the inner edge of the accommodating section 112, and the optical microstructures 11c may be distributed on the inner edge of the accommodating section 112 and the inner edge of the annular section 111 at most.

Furthermore, the relative positions of any one of the optical microstructures 11c and the inner surface 11b can be adjusted and changed according to design requirements, for example: the inner surface 11b may be one of a plurality of preset surfaces P1, P2, P3 in fig. 8. That is, at least one of the plurality of optical microstructures 11c is formed to be recessed or protruded from the inner surface 11b of the accommodating groove 11; alternatively, at least one of the optical microstructures 11c is partially formed to be recessed from the inner surface 11b of the accommodating groove 11, and another portion is formed to be protruded from the inner surface 11b of the accommodating groove 11.

The sealing layer 2 is light-tight and is attached to the sheet 12 to seal the notch 113 of the accommodating groove 11, so that the sealing layer 2 and the accommodating groove 11 together enclose a closed space E. The contact lens 3 and the preserving fluid 4 are disposed in the closed space E, and the contact lens product 100 has a bubble B in the closed space E (i.e., the preserving fluid 4 does not fill the accommodating groove 11), and at least a portion of the contact lens 3 is immersed in the preserving fluid 4, but the invention is not limited thereto. For example, in other embodiments of the invention not shown, the enclosed space E may be free of bubbles B.

Furthermore, the accommodating groove 11 is immersed in the preserving fluid 4 through at least part of the optical microstructures 11c, so that the corresponding portion is defined as a wetting area R1 and has a second transparency greater than the first transparency. In more detail, since the accommodating groove 11 is formed with the plurality of optical microstructures 11c, the light passing through the accommodating groove 11 is refracted and diffused by the plurality of optical microstructures 11c. Furthermore, the refractive index difference between the accommodating groove 11 and the preserving fluid 4 is smaller than that between the accommodating groove and air, and the aspect ratio of the optical microstructures 11c is similar, so that the light diffusion condition of the light passing through the wetting region R1 is reduced (i.e. the wetting region R1 is more beneficial to the direct passing of the light), and further the second transparency is higher than the first transparency.

As described above, the contact lens product 100 in the present embodiment forms a plurality of optical microstructures 11c with similar aspect ratio (e.g. 0.01-0.1) on the inner surface 11b of the accommodating groove 11, so that the accommodating groove 11 can pass through the matching relationship between the optical microstructures 11c and the preserving fluid 4, thereby enabling the accommodating groove 11 to selectively exhibit the first transparency or the second transparency according to different conditions (e.g. different detection processes).

In order to enable the accommodating groove 11 to more effectively exhibit the first transparency or the second transparency, any one of the optical microstructures 11c preferably excludes a configuration in which the end portion exhibits a flat surface, and the plurality of optical microstructures 11c are preferably distributed in a random (or irregular) manner on the inner surface 11b of the accommodating groove 11.

Furthermore, in the present embodiment, the contact lens product 100 may further prevent the contact lens 3 from adhering to the inner surface 11b of the accommodating groove 11 by the optical microstructures 11c formed in the accommodating groove 11, so as to facilitate the user to extract the contact lens 3 from the package 1.

In addition, the accommodating groove 11 is located in the air bubble B through the portions of the optical microstructures 11c, so that the corresponding portion is defined as a drying area R2 and has the first transparency. That is, the portion of the inner surface 11b of the accommodation groove 11 to which the preservation liquid 4 (or any liquid) is not attached can exhibit the first transparency.

The above is a structural description of the contact lens product 100 of the present embodiment, and the following describes the detection method S100 applied to the contact lens product 100. In the embodiment, the detection method S100 includes a pre-step S110, a groove detection step S130, a packaging step S150, and a lens detection step S170 in order, but the invention is not limited thereto. For example, in other embodiments of the present invention, which are not shown, the detection method S100 may add other steps at appropriate time points according to actual requirements. The above-described steps S110, S130, S150, S170 of the detection method S100 will be described in order below.

The preceding step S110: as shown in fig. 9 and 6, the package 1 is preferably manufactured by injection molding, and the structure of the package 1 is as shown in fig. 6 and 7 and the corresponding contents thereof, which are not described herein. However, the structure of the package 1 can be adjusted and changed according to design requirements; for example, in other embodiments of the invention, not shown, the containing tank 11 can be changed between the first transparency and the second transparency by its mating relationship with the preservation solution 4.

The tank detection step S130: as shown in fig. 9 and 10, an optical inspection apparatus 200 is used to inspect the defect of the accommodating tank 11. The optical detection apparatus 200 may be an automatic optical detection (automated optical inspection, AOI) apparatus in this embodiment. Furthermore, since the accommodating groove 11 has the first transparency (e.g., translucency), the accommodating groove 11 can partially refract the light passing through, so that the optical detection apparatus 200 can detect the defect of the accommodating groove 11 more accurately.

The packaging step S150: as shown in fig. 9 and 4, the contact lens 3 and the preserving fluid 4 are placed in the accommodating groove 11, and the sealing layer 2 seals the contact lens 3 and the preserving fluid 4 in the accommodating groove 11 (e.g. the closed space E) to form the contact lens product 100 together.

The portion of the accommodating tank 11 contacted by the preservation solution 4 is defined as the wetting region R1 and has the second transparency greater than the first transparency. Furthermore, the storage solution 4 does not fill the accommodating groove 11, so that the bubbles B are left in the accommodating groove 11 by the contact lens product 100, and the portion of the accommodating groove 11 contacted by the bubbles B is defined as the drying region R2 and has the first transparency.

The lens detection step S170: as shown in fig. 9 and 11, the optical inspection apparatus 200 is used to perform a lens defect inspection operation on the contact lens 3 located in the accommodating groove 11. Because the accommodating groove 11 has the second transparency (e.g., transparent), the accommodating groove 11 can substantially completely transmit light, so that the optical detection apparatus 200 can accurately detect the defect of the contact lens 3.

As described above, the detection method S100 in the present embodiment can change between the first transparency and the second transparency according to the matching relationship between the storage solution 4 and the storage tank 11, so that the detection method S100 can perform the tank detection step S130 on the storage tank 11 exhibiting the first transparency, and perform the lens detection step S170 on the contact lens product 100 through the storage tank 11 exhibiting the second transparency, thereby facilitating the full detection by the optical detection apparatus 200.

In addition, in the lens detecting step S170, the contact lens 3 is preferably completely immersed in the preserving fluid 4, so that the position of the contact lens 3 corresponds to the wetting area R1 of the accommodating groove 11, thereby facilitating the optical detecting apparatus 200 to accurately detect the defect of the contact lens 3, but the invention is not limited thereto.

[ technical Effect of embodiments of the invention ]

In summary, according to the detection method disclosed in the embodiment of the present invention, the detected accommodating groove body can change between the first transparency and the second transparency through the matching relationship between the accommodating groove body and the preservation solution, so that the detection method can perform the groove body detection step on the accommodating groove body exhibiting the first transparency, and perform the lens detection step on the contact lens product through the accommodating groove body exhibiting the second transparency, thereby facilitating the full detection by the optical detection instrument.

Furthermore, the contact lens product and the packaging box thereof disclosed by the embodiment of the invention can further improve the effect of changing the accommodating groove between the first transparency and the second transparency by the detailed structural characteristics of the accommodating groove (such as that any one of the optical microstructures is a cone and a plurality of the optical microstructures are distributed on the inner surface of the accommodating groove in a mutually connected manner, and the width of any one of the optical microstructures is between 0.01 mm and 0.1 mm).

The foregoing disclosure is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, as all changes which come within the meaning and range of equivalency of the description and drawings are therefore intended to be embraced therein.

Claims

1. A method of inspecting a contact lens product, the method comprising:

a pre-step: providing a packaging box which comprises a containing groove body and a sheet body connected with the containing groove body; wherein, the containing groove body has a first transparency;

a tank body detection step: performing a groove defect detection operation on the accommodating groove body by using an optical detection instrument;

and a packaging step: placing a contact lens and a preservation liquid into the accommodating groove body, and sealing the contact lens and the preservation liquid into the accommodating groove body by a sealing layer so as to jointly form a contact lens product; the storage liquid is in contact with the accommodating groove body, and the accommodating groove body is defined as a wetting area and has a second transparency which is larger than the first transparency; and

a lens detection step: and carrying out a lens defect detection operation on the contact lens positioned in the accommodating groove body by using the optical detection instrument.

2. The method according to claim 1, wherein in the packaging step, the storage liquid does not fill the accommodating groove, so that the contact lens product leaves a bubble in the accommodating groove; the portion of the accommodating groove body contacted by the air bubble is defined as a drying area and has the first transparency.

3. The method according to claim 2, wherein in the lens inspection step, the contact lens is completely immersed in the preserving solution so that the position of the contact lens corresponds to the wetted area of the accommodating vessel.

4. The method of claim 1, wherein the inner surface of the accommodating groove forms a plurality of optical microstructures, and each optical microstructure has an aspect ratio of 0.01-0.1.

5. The method of claim 1, wherein the package is manufactured by an injection molding process, and wherein the package is made of a material selected from the group consisting of polymethyl methacrylate, polypropylene, polycarbonate, polystyrene, and polyethylene terephthalate.

6. A contact lens product, the contact lens product comprising:

a packing box comprising a containing groove body and a sheet body connected with the containing groove body; wherein, the inner surface of the accommodating groove body forms a plurality of optical microstructures, and each optical microstructure has an aspect ratio of 0.01-0.1 so that the accommodating groove body has a first transparency;

the sealing layer seals the notch of the accommodating groove body so that the sealing layer and the accommodating groove body jointly enclose a closed space; and

a contact lens and a preservation solution, which are positioned in the closed space; the accommodating groove body is immersed into the preservation solution through at least part of the optical microstructures, so that the corresponding parts of the accommodating groove body are defined as a wetting area and have a second transparency which is larger than the first transparency.

7. The contact lens product of claim 6, wherein the contact lens product leaves a bubble within the enclosed space, and the receiving cavity is defined as a dry area and has the first transparency by portions of the optical microstructures being positioned within the bubble.

8. The contact lens product of claim 6, wherein a plurality of the optical microstructures are distributed over more than 70% of the inner surface of the receiving chamber.

9. The contact lens product of claim 6, wherein any one of the optical microstructures is tapered and a plurality of the optical microstructures are distributed in communication with each other on the inner surface of the receiving chamber.

10. The contact lens product of claim 6, wherein the depth of the receiving groove is between 3 mm and 10 mm and the width of any one of the optical microstructures is between 0.01 mm and 0.1 mm.

11. The contact lens product of claim 6, wherein the package is of unitary, one-piece construction and the material of the package is selected from one of polymethyl methacrylate, polypropylene, polycarbonate, polystyrene, and polyethylene terephthalate.

12. The contact lens product of claim 6, wherein at least one of the plurality of optical microstructures is recessed from the inner surface of the receiving well.

13. The contact lens product of claim 6, wherein at least one of the plurality of optical microstructures is formed protruding from the inner surface of the receiving channel.

14. The contact lens product of claim 6, wherein at least one of the plurality of optical microstructures is partially recessed from the inner surface of the receiving chamber and another portion thereof protrudes from the inner surface of the receiving chamber.

15. A package for a contact lens product, the package comprising:

the inner surface of the accommodating groove body forms a plurality of optical microstructures; wherein, each optical microstructure has an aspect ratio of 0.01-0.1 so that the accommodating groove body has a first transparency; and

the sheet body is connected with the accommodating groove body;

the accommodating groove body can be used for enabling the corresponding part of the accommodating groove body to have a second transparency which is larger than the first transparency through at least partial contact with a preservation liquid of the optical microstructures.

16. The package of contact lens products of claim 15, wherein the width of any one of the optical microstructures is between 0.01 mm and 0.1 mm.

17. The package of contact lens products according to claim 15, wherein any one of said optical microstructures is tapered and a plurality of said optical microstructures are distributed in connection with each other over more than 70% of the area of said inner surface of said receiving pocket.

18. The package of contact lens products of claim 15, wherein at least one of the plurality of optical microstructures is recessed or protruding from the inner surface of the receiving pocket.

19. The package of contact lens products according to claim 15, wherein at least one of the plurality of optical microstructures is partially formed recessed from the inner surface of the receiving channel and another partially formed protruding from the inner surface of the receiving channel.