JP7120840B2 - Endoscope hood mold - Google Patents

Description

The present invention relates to a mold for molding an endoscope hood to be attached to an endoscope.

In surgery and examination using an endoscope, the extension part of the endoscope (insertion side end) is used for the purpose of confirming the optimum distance from the extension part (insertion side end) to the living tissue and securing the field of view. A transparent hood is attached to the Here, such a hood is made of ABS, polycarbonate, vinyl chloride, silicone rubber, or the like.

However, such a hood is attached for the purpose of confirming the optimum distance from the extended portion of the endoscope to the living tissue and securing the field of view, and the camera lens and illumination lens are not covered. Therefore, there is a problem that body fluids and oils adhere to the hood during examination and surgery using an endoscope with a hood, and the visibility becomes unclear.

JP-A-11-047081

In order to solve such problems, it is conceivable to form an endoscope hood from a hydrogel formed using a hydrophilic monomer. As a method of forming an endoscope hood from hydrogel, a material containing a hydrophilic monomer is filled in a molding die such as plastic, and the temperature is raised to cause a copolymerization reaction. Then, an endoscope hood made of hydrogel can be obtained by causing the copolymerized material to swell with hydration. The shape of the endoscope hood obtained by this method corresponds to the shape of the mold filled with the material containing the hydrophilic monomer. However, endoscopes are provided not only with the same shape but also with various shapes. Therefore, it is necessary to manufacture using different molds according to the shape of the endoscope.

Further, as shown in Patent Document 1, there is provided an endoscope hood that has a cylindrical exterior and a disc portion that continues to the inner surface of the exterior. In such an endoscope hood, the shape of the disk portion is varied according to the position of the camera lens of the endoscope, etc., and the inner diameter of the exterior portion is varied according to the diameter of the distal end of the endoscope. In other words, adjustment was required for each of the disk portion and the exterior portion, and the versatility of the mold could not be enhanced.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-described problems, and is capable of molding an endoscope hood excellent in antifogging and antifouling properties, and increasing the versatility of molding dies. An object of the present invention is to provide a molding die for an endoscope hood.

A mold for an endoscope hood according to one aspect has a female mold and a male mold. In the mold, a filling space created between the female mold and the male mold is filled with a material containing a hydrophilic monomer, and the endoscope hood is molded by a copolymerization reaction of the material. The female mold has a tip forming surface corresponding to the tip surface positioned on the tip side of the endoscope hood. The male mold has an opposing forming surface corresponding to the opposing surface facing the distal end surface of the endoscope hood.

INDUSTRIAL APPLICABILITY According to the present invention, an endoscope hood molding die capable of molding an endoscope hood excellent in antifogging and antifouling properties even when used for a long period of time, and increasing versatility of the molding die. can be provided.

FIG. 1 is a perspective view of a molding die for an endoscope hood according to this embodiment. 2 is an exploded perspective view of the mold for the endoscope hood shown in FIG. 1. FIG. 3 is a side view of the mold for the endoscope hood shown in FIG. 1. FIG. 4 is a cross-sectional view taken along line AA of FIG. 3. FIG. 5 is a cross-sectional view taken along line BB of FIG. 3. FIG. FIG. 6 is a diagram showing a state in which the endoscope hood obtained by the mold for the endoscope hood of the present embodiment is attached to the endoscope. FIG. 7 is a diagram showing a cross-sectional view and a plan view of an endoscope hood. FIG. 8 is a cross-sectional view of an endoscope hood according to Modification 1. FIG. FIG. 9 is a cross-sectional view of an endoscope hood according to Modification 2. FIG.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid unnecessary verbosity in the following description and to facilitate understanding by those skilled in the art. It is noted that the inventors provide the accompanying drawings and the following description for a full understanding of the present disclosure by those skilled in the art and are not intended to limit the claimed subject matter thereby. do not have.

In addition, in the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. However, it should be noted that the drawings are schematic and the ratio of each dimension may differ from the actual one. Therefore, specific dimensions and the like should be determined with reference to the following description. In addition, there are cases where portions having different dimensional relationships and ratios are included between the drawings.

A molding die 1 for an endoscope hood according to an embodiment will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a perspective view of a molding die for an endoscope hood according to this embodiment, and FIG. 2 is an exploded perspective view of the molding die for the endoscope hood shown in FIG. FIG. 2 shows an endoscope hood together with a mold. 3 is a side view of the mold for the endoscope hood shown in FIG. 1. FIG. 4 is a cross-sectional view along line AA of FIG. 3, and FIG. 5 is a cross-sectional view along line BB of FIG. FIG. 6 is a diagram showing an example of a state in which the endoscope hood obtained by the molding die of the present embodiment is attached to the endoscope. FIG. 7 is a diagram showing a cross-sectional view and a plan view of an endoscope hood. FIG. 7A is a cross-sectional view, and FIG. 7B is a plan view. Note that FIG. 7A is a cross-sectional view taken along line CC of FIG. 7B.

A molding die (hereinafter referred to as a molding die) 1 for an endoscope hood according to the present embodiment is an endoscope mounted on an insertion side end portion (extending portion) 100E of an endoscope 100 of an endoscope. It is a mold for forming a hood. As shown in FIG. 6 and the like, the endoscope hood 50 is configured to be attached to an insertion-side end portion (extending portion) 100E of the endoscope 100 .

The endoscope hood 50 according to this embodiment is made of hydrogel. Examples of hydrogels include hydrogels formed using only hydrophilic monomers, hydrogels formed by adding hydrophobic monomers, cross-linking monomers, or both to hydrophilic monomers, and the like. The hydrophilic monomer contributes to the water content of the hydrogel, and the hydrophobic monomer contributes to the adjustment of the water content and swelling rate of the hydrogel. Affects flexibility. In addition, the content of the crosslinkable monomer makes it possible to control the density of the polymer chains of the hydrogel, thereby imparting mechanical strength, shape stability, and solvent resistance to the hydrogel.

The water content of the hydrogel is not particularly limited as long as it can be molded, but it can be, for example, 20 to 70% by weight.
Water content (% by weight) = [(W - D) / W] x 100 (W: wet weight, D: dry weight)
Moreover, the water content can be appropriately selected as necessary. For example, the moisture content of the exterior portion 51 and the moisture content of the disk portion 52 may be 20 to 70% by weight, respectively.

As the hydrophilic monomer, those having one or more hydrophilic groups in the molecule are preferable. ) acrylate, acrylamide, N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-vinylpyrrolidone, diacetone acrylamide, N-vinylacetamide, (meth)acrylic acid, (meth)acryloxy Ethylsuccinic acid, itaconic acid, methacrylamidopropyltriammonium chloride, 2,3-dihydroxypropyl (meth)acrylate, etc., may be mentioned, and two or more of these hydrophilic monomers may be used in combination.

Among the above hydrophilic monomers, 2-hydroxyethyl (meth)acrylate, N,N-dimethyl(meth)acrylamide, and N-vinylpyrrolidone are preferably used in the present invention from the viewpoint of handling.

The blending ratio of the hydrophilic monomer is not particularly limited, but since it affects the water content of the endoscope hood 50 obtained, it is preferably 50% by weight or more in the total polymer components. If the blending ratio of the hydrophilic monomer is less than 50% by weight, the endoscope hood 50 having a sufficient water content cannot be obtained, so that the endoscope hood 50 has reduced antifouling properties and antifogging properties. It is not preferable because it is a concern.

Hydrophobic monomers include, for example, siloxanyl (meth)acrylate, trifluoroethyl (meth)acrylate, methacrylamide, cyclohexyl (meth)acrylate, normal butyl (meth)acrylate and the like. You may use it in combination of 2 or more types.

The hydrophobic monomer can change the water content of the endoscope hood 50 obtained according to the blending amount. However, if the blending ratio of the hydrophobic monomer is high, the water content is extremely lowered, and the flexibility of the resulting endoscope hood 50 is lowered. is preferred.

Examples of crosslinkable monomers include ethylene glycol di(meth)acrylate, methylenebisacrylamide, 2-hydroxy-1,3-dimethacryloxypropane, trimethylolpropane triacrylate and the like, and two or more of these may be used. They may be used in combination.

The amount of the crosslinkable monomer to be blended is preferably 0.1 to 10% by weight based on the total amount of the monomers, from the viewpoint of the effect of adjusting the shape of the endoscope hood 50 to be obtained. If it is less than 0.1% by weight, the mesh structure of the endoscope hood 50 will be insufficient, and if it exceeds 10% by weight, the mesh structure will be excessive, making the endoscope hood 50 fragile and flexible. diminished sexuality.

Polymerization initiators used in polymerizing the mixture of the above monomers include general radical polymerization initiators such as lauroyl peroxide, cumene hydroperoxide, and benzoyl peroxide, and azobisvaleronitrile. , azobisisobutyronitrile and the like. The amount of polymerization initiator to be added is preferably about 10 to 3500 ppm with respect to the total amount of monomers.

The endoscope hood 50 according to the present embodiment is made of a single material or a mixture of a plurality of the monomers described above and formed into a desired shape, and is made of a single material.

As a process for obtaining a polymer, a monomer mixed solution obtained by mixing the constituent monomers is placed in a mold made of metal, glass, plastic, etc., sealed, and then heated stepwise or continuously at 25 to 120 ° C. in a constant temperature bath or the like. and complete the copolymerization reaction in 5 to 120 hours to obtain a mold containing the polymer. Ultraviolet rays, electron beams, gamma rays, or the like can be used for polymerization.

In the process of obtaining hydrogel, the mold after polymerization is cooled to room temperature, the polymer contained in the mold is peeled off from the mold, and if necessary, cut and polished, and then the polymer is hydrated and swollen. to form a hydrogel. Liquids (swelling liquids) to be used include, but are not limited to, water, physiological saline, isotonic buffer solutions, and solutions obtained by mixing these with organic solvents such as ethanol. The swelling liquid is heated to 60 to 100° C., and the polymer is immersed in the swelling liquid for a certain period of time to be swollen. Moreover, it is preferable to remove unreacted monomers adhering to the polymer during the swelling treatment. The resulting hydrogel can be shaped by subjecting it to high-pressure steam sterilization at 110 to 130° C. for 10 to 60 minutes while being immersed in a swelling liquid such as physiological saline.

The endoscope hood 50 according to the present embodiment is excellent in antifogging properties and antifouling properties, so that it is possible to feed body fluids and oils adhering to the lens portion to the endoscope 100 during surgery and examinations. It can be easily removed by water jetted from the mechanism. In addition, it becomes possible to suppress fogging. Therefore, even during long-term surgery and examinations, it is not necessary to remove the endoscope 100 to remove contamination or fogging of the lens portion. become.

As shown in FIGS. 6 and 7 , the endoscope hood 50 includes an exterior portion 51 and a disc portion 52 . The endoscope hood 50 has an axial direction A and a radial direction R. As shown in FIG. An axial direction A of the endoscope hood 50 is along the insertion direction of the endoscope 100 . The exterior part 51 is provided in a vertical direction from the outer periphery of the disk part 52 . The exterior part 51 has a cylindrical shape extending in the axial direction A and may have a tapered shape that narrows in the insertion direction of the endoscope 100 . The exterior portion 51 may have a mounting portion 511 that contacts the outer peripheral surface of the endoscope 100 and an extension portion 512 that extends from the mounting portion 511 to the distal side in the insertion direction of the endoscope 100 . The mounting portion 511 abuts on the endoscope 100 and has a function of fixing the endoscope hood 50 to the endoscope 100 . Therefore, the inner diameter f of the mounting portion 511 is appropriately designed according to the endoscope 100 to be used. The extending portion 512 has a function of ensuring a distance between the distal end of the endoscope and the distal end of the endoscope hood 50 . More specifically, the distance between the tip of the endoscope and the living tissue and the field of view of the endoscope are secured.

As shown in FIG. 7 , the endoscope hood 50 has a distal end surface 55 located on the distal end side of the endoscope hood 50 and a facing surface 56 facing the distal end surface 55 . The distal surface 55 is a surface on the distal side in the insertion direction of the endoscope 100 to which the endoscope hood 50 is attached. The distal end surface 55 includes the edge of the extending portion 512 in the axial direction A and the surface of the disk portion 52 on the extending portion 512 side. The facing surface 56 includes the edge of the mounting portion 511 in the axial direction A and the surface of the disk portion 52 on the mounting portion 511 side.

The length g of the extending portion 512 in the axial direction A is not particularly limited as long as it is a length that can secure the distance and the field of view. A length g of the extending portion 512 in the axial direction A is preferably 0 to 10 mm, more preferably 2 to 5 mm. If it exceeds 10 mm, the reflection of the extending portion 512 on the camera lens becomes large and the field of view is narrowed, which is not preferable. In addition, since the extending portion 512 also has a function of pushing apart the living tissue when the endoscope 100 is inserted deep inside, it is necessary to have flexibility and strength to the extent that the living tissue is not damaged. be. The thickness u of the extending portion 512 is preferably 0.1 to 1.0 mm, more preferably 0.3 to 0.5 mm. The length g and thickness u of the extending portion 512 are appropriately designed. Further, the endoscope hood 50 does not have the extending portion 512 (even if the length g of the extending portion 512 in the axial direction A is 0 mm) as in Modified Example 2 described later. good.

The length b of the mounting portion 511 is not particularly limited as long as it is long enough to fix the endoscope hood 50 to the endoscope 100 . The length b of the mounting portion 511 is preferably 5 to 20 mm, more preferably 10 to 15 mm. Moreover, the thickness t of the mounting portion 511 is preferably 0.1 to 1.0 mm, more preferably 0.3 to 0.5 mm. The length b and thickness t of the mounting portion 511 are appropriately designed.

The disc portion 52 has a circular shape in plan view. The disk portion 52 is positioned in the middle of the exterior portion 51 in the axial direction A and continues to the inner surface of the exterior portion 51 . The disk portion 52 has a forceps port 53 that serves as an entrance and exit for forceps, and a water supply port 54 that serves as an outlet of a water supply portion for cleaning the disk portion 52 . The forceps port 53 and the water supply port 54 are openings penetrating through the disk portion 52 and constitute the openings of the present invention. The thickness e of the disc portion 52 is preferably 0.01 to 1.0 mm, more preferably 0.05 to 0.7 mm, most preferably 0.1 to 0.5 mm. If the thickness e of the disk portion 52 exceeds 1.0 mm, it adversely affects the field of view obtained through the camera lens. If the thickness e of the disk portion 52 is smaller than 0.01 mm, the strength of the disk portion 52 is lowered, and there is concern that the disk portion 52 may be damaged during use. The thickness e of the disk portion 52, the position and shape of the forceps port 53, and the position and shape of the water supply port 54 are appropriately designed according to the structure of the endoscope to be attached.

Next, the molding die 1 for molding the endoscope hood 50 configured as described above will be described in detail with reference to FIGS. 1 to 5. FIG. Mold 1 has female mold 6 and male mold 4 . The molding die 1 fills a filling space S created between the female mold 6 and the male mold 4 with a material containing a hydrophilic monomer and causes a copolymerization reaction of the material to mold the endoscope hood 50. is a type. The molding die 1 may be made of a material suitable for raising the temperature during the copolymerization reaction, and is made of plastic, for example. The mold 1 has a cylindrical shape and has an axial direction A and a radial direction R. As shown in FIG. The axial direction A of the mold 1 is along the axial direction A of the endoscope hood 50 .

The female mold 6 has a second female mold 3 and a first female mold 2 . Therefore, the mold 1 of this embodiment is composed of three members, the first female mold 2 , the second female mold 3 and the male mold 4 . The filling space S is surrounded by the inner surface of the first female mold 2 , the outer surface of the second female mold 3 and the outer surface of the male mold 4 . In FIG. 3, the filling space S is hatched. It should be noted that, like a molding die 1Y according to Modification Example 1, which will be described later, it is composed of two members, a female die 6Y obtained by integrating a first female die 2 and a second female die 3, and a male die 4. good too. A molding die 1Y according to Modification 1 will be described later.

Since the mold 1 has at least two molds (the female mold 6 and the male mold 4), the shape of the female mold 6 and the shape of the male mold 4 can be adjusted according to the shape of the endoscope hood 50. . When adjusting the shape of the endoscope hood 50 , it is possible to adjust only the male mold 4 without adjusting the female mold 6 or to adjust only the female mold 6 without adjusting the male mold 4 . It is possible to increase the versatility of each type.

Further, since the mold 1 has the first female mold 2, the second female mold 3 and the male mold 4, the shape of the first female mold 2 and the shape of the second female mold can be changed according to the shape of the endoscope hood 50. The shape of 3 and the shape of the male mold 4 can be adjusted. The combination pattern of molds is increased, and the shape pattern of the endoscope hood 50 can be increased. In addition, when adjusting the shape of the endoscope hood 50, the first female mold 2, the second female mold 3 and the male mold 4 can be adjusted to increase the versatility of each mold.

As shown in FIG. 2, the first female mold 2 has a cylindrical shape and has a housing portion 23 for housing the second female mold 3 and the male mold 4 at the center in the radial direction. The accommodating portion 23 is a space surrounded by the inner surface 2A of the first female mold 2 and penetrates the first female mold 2 in the axial direction A. As shown in FIG. The male mold 4 and the second female mold 3 are configured to be inserted into the housing portion 23 along the axial direction A. As shown in FIG. The first female mold 2 has a first rear end 21 for inserting and removing the second female mold 3 and the male mold 4, and a first front end 22 on the opposite side of the first rear end 21 in the axial direction.

As shown in FIG. 2, the first direction X1 in which the male die 4 and the second female die 3 are inserted into the first female die 2 is the direction from the first rear end 21 to the first tip 22. The second direction X2 for removing the 4 and the second female mold 3 from the first female mold 2 is the direction from the first front end 22 to the first rear end 21 . The first tip 22 is located on the tip side in the insertion direction of the male mold 4 or the like into the first female mold 2 . In this embodiment, the endoscope hood 50 molded by the molding die 1 is mounted in the first direction (direction of insertion of the second female die 3 and the male die 4 into the first female die 2) X1. It matches the insertion direction of the endoscope 100 shown in FIG. However, in another form, the first direction X1 may be the direction opposite to the insertion direction of the endoscope 100 . Moreover, the insertion direction of the male die 4 into the first female die 2 and the insertion direction of the second female die 3 into the first female die 2 may be the same as in this embodiment, or may be opposite. It can be a direction.

The inner surface 2A of the first female mold 2 contacts the outer surface 3B of the second female mold 3 and the contact surface 47 of the male mold 4 . 2 A of inner surfaces of the 1st female mold 2 comprise a female mold contact surface. It has an outer peripheral surface 24 corresponding to the outer peripheral surface of the endoscope hood 50 . The inner surface 2A of the first female mold 2 has a tapered shape that narrows in the insertion direction of the endoscope 100 (the first direction X1 in the present embodiment). The outer periphery forming surface 24 is provided in the central portion in the axial direction A of the inner surface 2A of the first female mold 2 . The outer periphery forming surface 24 is a surface surrounding the filling space S. As shown in FIG. The outer circumference forming surface 24 is spaced apart from the outer surface of the male mold 4 (mounting forming surface to be described later). In addition, the outer circumference forming surface 24 is arranged with a space from the outer surface of the second female mold 3 (an extension forming surface 34 described later). The outer periphery forming surface 24 is a surface corresponding to the outer peripheral surface of the exterior portion 51 of the endoscope hood 50 .

The second female mold 3 is arranged on the first direction X1 side of the male mold 4 in the housing portion 23 . The second female die 3 has a second rear end 31 positioned on the first rear end 21 side and a second tip 32 positioned on the first tip 22 side. The second rear end 31 is configured by an edge in the axial direction A of an opening forming portion, which will be described later. The second tip 32 is located on the tip side in the direction of insertion into the first female mold 2 .

The second female mold 3 has an outer surface 3B that contacts the inner surface 2A of the first female mold 2 . The outer surface 3B of the second female mold 3 has a tapered shape that narrows in the insertion direction of the endoscope 100 (the first direction X1 in the present embodiment). The outer surface 3B of the second female mold 3 extends parallel to the inner surface 2A of the first female mold 2. As shown in FIG. When the second female mold 3 is inserted into the accommodating portion 23 of the first female mold 2 to a predetermined position, the outer surface 3B of the second female mold 3 contacts the inner surface 2A of the first female mold 2, and the first tip 22 The movement of the second female mold 3 in the axial direction A to the side is restricted.

The second female mold 3 has an outer surface surrounding the filling space S on the second direction X2 side of the outer surface 3B. The outer surface surrounding the filling space S of the second female mold 3 includes a tip forming surface 33 and an extension forming surface 34 . The tip forming surface 33 is a surface corresponding to the tip surface 55 of the endoscope hood 50 . The tip forming surface 33 has a first tip forming surface 331 and a second tip forming surface 332 . The first tip forming surface 331 is a surface corresponding to the extending portion side surface of the disk portion 52 of the endoscope hood 50 . The first tip forming surface 331 is arranged in the center of the second female die 3 in the radial direction R and has a circular shape in plan view. The second tip forming surface 332 is a surface corresponding to the edge in the axial direction A of the extending portion 512 of the endoscope hood 50 . The second tip forming surface 332 extends inward in the radial direction R from the edge of the outer surface 3B in the second direction X2 and reaches the edge of the extension forming surface 34 in the first direction X1. The second tip forming surface 332 is ring-shaped in plan view.

The second tip forming surface 332 is arranged closer to the second tip 32 (first direction X1 side) than the first tip forming surface 331 in the axial direction A. As shown in FIG. A surface extending in the axial direction A from the first tip forming surface 331 to the second tip forming surface 332 constitutes the extension forming surface 34 . A distance g1 in the axial direction A between the second tip forming surface 332 and the first tip forming surface 331 is the length of the extension forming surface 34 in the axial direction A, and the length of the extending portion 512 of the endoscope hood 50. becomes g.

The extension formation surface 34 is a surface corresponding to the inner peripheral surface of the extension portion 512 of the endoscope hood 50 . It is arranged so as to face the outer circumference forming surface 24 of the first female mold 2 . A filling space S sandwiched between the outer periphery forming surface 24 of the first female mold 2 and the extension forming surface 34 of the second female mold 3 is an extension space corresponding to the extension portion 512 of the exterior portion 51 . A space u1 between the outer periphery forming surface 24 and the extension forming surface 34 is the width of the extension space and is the thickness u of the extension portion 512 of the endoscope hood 50 . The thickness u of the extension portion 512 can be adjusted by adjusting the distance between the outer periphery forming surface 24 and the extension forming surface 34 . Also, the inner diameter of the extension portion 512 can be adjusted by adjusting the outer diameter of the extension forming surface 34 . The extension formation surface 34 has a tapered shape that narrows in the insertion direction of the endoscope 100 (the first direction X1 in the present embodiment). In the configuration in which the extension forming surface 34 extends parallel to the outer periphery forming surface 24, the thickness of the extension portion 512 of the endoscope hood 50 is constant. In addition, the extension forming surface 34 may not have a tapered shape, but may extend along the axial direction A or may not be parallel to the outer peripheral forming surface 24 .

The width of the second tip forming surface 332 in the radial direction R is the thickness of the edge of the extending portion 512 in the axial direction A. As shown in FIG. The width of the second tip forming surface 332 in the radial direction R matches the interval between the outer periphery forming surface 24 of the first female die 2 and the extension forming surface 34 of the second female die 3 . In addition, in a configuration in which the thickness u of the extension portion 512 changes, the interval u1 between the outer circumference forming surface 24 and the extension forming surface 34 may change. u1 may be different from the width of the second tip forming surface 332 in the radial direction R.

The second female mold 3 is formed with openings 35 corresponding to the openings (the forceps port 53 and the water supply port 54) of the endoscope hood 50. As shown in FIG. The opening forming portion 35 protrudes from the first tip forming surface 331 in the axial direction A (the second direction X2 in the present embodiment). In the region where the opening forming part 35 is provided, the opening forming part 35 of the second female mold 3 and the first opposing forming surface 431 of the male mold 4 are in contact with each other, and an opening passing through the disk part 52 is formed. In the region around the opening forming portion 35, the first tip forming surface 331 of the second female mold 3 and the first opposing forming surface 431 of the male mold 4 are arranged apart from each other, forming a disk portion 52 having a thickness. .

The position and shape of the opening of the endoscope hood 50 can be adjusted by the position and shape of the opening forming portion 35 . Moreover, in another embodiment, the opening forming part 35 may be provided on the male mold 4 or may be provided on both the second female mold 3 and the male mold 4 . By providing the opening forming part 35 in either one of the second female mold 3 and the male mold 4, when adjusting the opening pattern of the endoscope hood 50, the opening pattern of the second female mold 3 and the male mold 4 can be adjusted. Only one side needs to be adjusted, and the versatility of the mold 1 can be enhanced.

The male mold 4 is arranged on the second direction X<b>2 side of the second female mold 3 in the housing portion 23 . The male mold 4 has a male rear end 41 positioned on the first rear end 21 side and a male tip 42 positioned on the first tip 22 side. The male tip 42 is configured by a first opposing forming surface 431, which will be described later. The male die 4 contacts the opening forming portion 35 of the second female die 3 with the male tip 42 and the contact surface 47 of the male die 4 contacts with the inner surface 2A of the first female die 2, thereby Movement to the 1 tip 22 side is restricted. If the mold 1 does not have the opening forming portion 35, the first female mold 2 may be provided with a locking portion that restricts the movement of the male mold 4. contact surface 47 may contact the inner surface 2A of the first female die 2 to restrict the movement of the second female die 3 in the axial direction A toward the first tip 22 side.

The male mold 4 has an outer surface surrounding the filling space S. The outer surface of the male mold 4 includes an opposing forming surface 43 , a mounting forming surface 44 and an abutment surface 47 . The opposing forming surface 43 is a surface corresponding to the opposing surface 56 of the endoscope hood 50 . The opposing forming surface 43 has a first opposing forming surface 431 and a second opposing forming surface 432 . The first opposing forming surface 431 is a surface corresponding to the surface of the disk portion 52 on the mounting portion 511 side. The first opposing formation surface 431 is arranged in the center of the male mold 4 in the radial direction R and has a circular shape in plan view. The second opposing forming surface 432 is a surface corresponding to the edge of the mounting portion 511 in the axial direction A. As shown in FIG. The second opposing forming surface 432 extends outward in the radial direction R from the edge of the mounting forming surface 44 of the male mold 4 in the second direction X2, and extends to the edge of the contact surface 47 of the male mold 4 in the first direction X1. have reached. The second opposing forming surface 432 has a ring shape in plan view.

The first opposing forming surface 431 of the male mold 4 is spaced apart in the axial direction A from the first tip forming surface 331 of the second female mold 3 . The distance e<b>1 between the first opposing formation surface 431 and the first distal end formation surface 331 is the thickness e of the disc portion 52 of the endoscope hood 50 . The thickness e of the disk portion 52 can be adjusted by adjusting the distance e1 between the first opposing forming surface 431 and the first tip forming surface 331 . Since the male mold 4 has the opposing forming surface 43 and the second female mold 3 has the tip forming surface 33, the endoscopic hood can also be adjusted by adjusting one of the second female mold 3 and the male mold 4. The tip surface 55 of 50, the opposing surface 56, and the area therebetween can be adjusted, and the versatility of the molding die 1 can be enhanced. The first opposing forming surface 431 contacts the opening forming portion 35 of the second female mold 3 as described above.

The second opposing forming surface 432 is arranged closer to the male rear end 41 (second direction X2) than the first opposing forming surface 431 in the axial direction A. As shown in FIG. A surface extending in the axial direction A from the first opposing forming surface 431 to the second opposing forming surface 432 constitutes the mounting forming surface 44 . A distance b1 in the axial direction A between the second opposing forming surface 432 and the first opposing forming surface 431 is the length of the mounting forming surface 44 in the axial direction A, and the length b of the mounting portion 511 of the endoscope hood 50. becomes.

The mounting surface 44 is a surface corresponding to the inner peripheral surface of the mounting portion 511 of the endoscope hood 50 . The mounting forming surface 44 is arranged to face the outer peripheral forming surface 24 of the first female mold 2 . A filling space S sandwiched between the outer periphery forming surface 24 of the first female mold 2 and the mounting forming surface 44 of the male mold 4 is a mounting space corresponding to the mounting portion 511 of the exterior portion 51 . A distance t<b>1 between the outer periphery forming surface 24 and the mounting forming surface 44 is the width of the mounting space and the thickness t of the mounting portion 511 of the endoscope hood 50 . The thickness t of the mounting portion 511 can be adjusted by adjusting the distance t1 between the outer circumference forming surface 24 and the mounting forming surface 44 . Further, by adjusting the outer diameter f1 of the attachment forming surface 44, the inner diameter f of the attachment portion 511 can be adjusted. The mounting surface 44 has a tapered shape that tapers in the insertion direction of the endoscope 100 (the first direction X1 in the present embodiment). In the configuration in which the mounting surface 44 extends parallel to the outer periphery forming surface 24, the thickness of the mounting portion 511 of the endoscope hood 50 is constant. The attachment formation surface 44 may not be tapered, but may extend along the axial direction A or may not be parallel to the outer periphery formation surface 24 .

The width of the second opposing formation surface 432 in the radial direction R is the thickness of the edge of the mounting portion 511 in the axial direction A. As shown in FIG. The width of the second opposing forming surface 432 in the radial direction R matches the interval between the outer peripheral forming surface 24 of the first female mold 2 and the mounting forming surface 44 of the male mold 4 . In addition, in the configuration in which the thickness t of the mounting portion 511 changes, the distance between the outer circumference forming surface 24 and the mounting forming surface 44 may change, and the distance between the outer circumferential forming surface 24 and the mounting forming surface 44 is set to the second opposing distance. It may be different from the width in the radial direction R of the formation surface 432 .

The extending space sandwiched between the outer periphery forming surface 24 of the first female mold 2 and the extending forming surface 34 of the second female mold 3 forms the extending portion 512 of the endoscope hood 50, and the first female mold A mounting portion 511 of the endoscope hood 50 is formed by a mounting space sandwiched between the outer periphery forming surface 24 of the male mold 4 and the mounting forming surface 44 of the male mold 4 . It is possible to adjust the thickness u of the extending portion 512 and the thickness t of the mounting portion 511 without adjusting all three molds, the first female mold 2, the second female mold 3, and the male mold 4. , the versatility of the mold 1 can be enhanced.

The interval (width of the extension space) u1 between the inner surface of the first female mold 2 and the outer surface of the second female mold 3 in the extension space, and the interval between the inner surface of the first female mold 2 and the outer surface of the male mold 4 ( The width t1 of the mounting space may be the same or different. The thickness u of the extending portion 512 and the thickness t of the mounting portion 511 can be made different by appropriately adjusting the three molds of the first female mold 2 , the second female mold 3 and the male mold 4 . For example, the thickness t of the mounting portion 511 may be thinner than the thickness u of the extension portion 512 . Specifically, the thickness t of the mounting portion 511 is equal to the thickness u of the extension portion 512 from the viewpoint of the pressing property for fixing the disc portion 52 to the endoscope 100 and the fixing property of the endoscope hood 50. On the other hand, it is preferably formed in the range of 50 to 95%.

The contact surface 47 of the male mold 4 contacts the inner surface 2A of the first female mold 2 . The contact surface 47 of the male mold 4 constitutes the male mold contact surface. It has a tapered shape that narrows in the insertion direction of endoscope 100 (the first direction X1 in the present embodiment). The contact surface 47 of the male mold 4 extends parallel to the inner surface 2A of the first female mold 2 . When the male die 4 is inserted into the receiving portion 23 of the first female die 2 to a predetermined position, the contact surface 47 of the male die 4 contacts the inner surface 2A of the first female die 2 and moves toward the first tip 22 side. movement in the axial direction A of the male mold 4 may be restricted.

When manufacturing the endoscopic hood 50 using the mold 1 configured as described above, the second female mold 3 is inserted into the first female mold 2, a material containing a hydrophilic monomer is injected, and then the male mold is injected. 4 can be inserted and the material can be copolymerized. At this time, the material filled before insertion of the male mold 4 may exceed the capacity of the filling space S, and the endoscope hood 50 may not be formed in the intended shape. At least one of the male mold 4 and the second female mold 3 preferably has a recess that continues to the filling space S and extends in a direction away from the filling space S. The direction away from the filling space S is the axial direction toward the second front end 32 in the second female mold 3 , and the axial direction toward the male rear end 41 in the male mold 4 .

The concave portion 45 of the present embodiment extends from the second opposing forming surface 432 of the male mold 4 along the axial direction A toward the male rear end 41 side. The recess 45 is recessed inward in the radial direction R from the contact surface 47 . By providing the concave portion 45, when the material filled before the insertion of the male mold 4 exceeds the capacity of the filling space S, the material containing the hydrophilic monomer can be guided from the filling space S to the concave portion 45. The speculum hood 50 can be molded in the intended shape. Moreover, it is preferable that a plurality of recesses 45 be provided at intervals. The recesses of this embodiment are provided at intervals of 90 degrees.

The inner surface (female contact surface) 2A of the first female mold 2 and the contact surface (male contact surface) 47 of the male mold 4 are tapered toward the distal end of the endoscope 100 . Since the inner surface 2A of the first female mold 2 and the contact surface 47 of the male mold 4 are tapered, the male mold 4 can be smoothly fitted into and pulled out of the first female mold 2. As shown in FIG. In addition, in the configuration in which the male mold 4 is positioned by contact between the contact surface 47 of the male mold 4 and the inner surface 2A of the first female mold 2, the position of the male mold 4 within the first female mold 2 is easy to stabilize. In addition, since the surfaces of the male mold 4 and the first female mold 2 are brought into contact with each other, the pressure is dispersed and the force can be applied evenly. Therefore, the position and angle of the male mold 4 within the first female mold 2 are stabilized, and the endoscope hood can be formed in a predetermined size and shape.

Similarly, the inner surface 2A of the first female mold 2 and the outer surface 3B of the second female mold 3 may also be tapered toward the distal end of the endoscope 100 . The fitting and withdrawal of the second female mold 3 with respect to the first female mold 2 can be performed smoothly. In addition, in the configuration in which the second female mold is positioned by the contact between the outer surface 3B of the second female mold 3 and the inner surface 2A of the first female mold 2, the second female mold 2 within the first female mold 2 is positioned. The position of 3 is easy to stabilize. In addition, the contact between the surfaces of the second female mold 3 and the first female mold 2 disperses the pressure and allows the force to be applied evenly. Therefore, the position and angle of the second female mold 3 within the first female mold 2 are stabilized, and the endoscope hood can be formed in a predetermined size and shape.

The inclination angle of the inner surface 2A of the first female mold 2 with respect to the axial direction A, the inclination angle of the outer surface 3B of the second female mold 3 with respect to the axial direction A, and the inclination angle of the contact surface 47 of the male mold 4 with respect to the axial direction A are: It may be 0.01 degrees or more and 10.0 degrees or less, preferably 0.01 degrees or more and 5.0 degrees or less, and more preferably 0.01 degrees or more and 2.0 degrees or less.

Next, a molding die 1Y for an endoscope hood according to Modification 1 will be described with reference to FIG. FIG. 8 is a cross-section corresponding to FIG. 4 in the description of the above embodiment, and is a cross-section of Modification 1Y with reference to line AA shown in FIG. In the following description, the same reference numerals are used for the same configurations as in the above-described embodiment, and description thereof is omitted. A mold 1Y according to Modification 1 has a female mold 6Y in which the first female mold 2 and the second female mold 3 in the above embodiment are integrated. The female mold 6Y has a housing portion 23Y capable of housing the male mold 4 therein.

The first direction X1 in which the male mold 4 is inserted into the female mold 6Y is the direction from the female rear end 61 to the female front end 62, and the second direction X2 in which the male mold 4 is removed from the female mold 6Y is from the female front end 62 to the female end. This is the direction toward the rear end 61 . The inner surface 6A of the female mold 6Y corresponds to the inner surface 2A of the first female mold 2. As shown in FIG. The first tip forming surface 631 and the second tip forming surface 632 of the female mold 6Y correspond to the first tip forming surface 331 and the second tip forming surface 332 of the second female mold 3, respectively. The opening forming portion 65 of the female mold 6Y corresponds to the opening forming portion 35 of the second female mold 3 and abuts against the male tip 42 . The extension forming surface 64 of the female mold 6</b>Y corresponds to the extension forming surface 34 of the second female mold 3 . In the mold 1Y according to Modification 1 configured in this way, the male mold 4 is inserted after the material containing the hydrophilic monomer is injected into the female mold 6Y, and the material is subjected to a copolymerization reaction. A scope hood 50 can be manufactured.

Next, a molding die 1Z for an endoscope hood according to Modification 2 will be described with reference to FIG. FIG. 9 is a cross section corresponding to FIG. 4 in the description of the above embodiment, and is a cross section of modification 2Z with reference to line AA shown in FIG. The mold 1Z according to Modification 2 does not have the second tip forming surface 332 and the extension forming surface 34 of the second female mold 3 in Embodiment 1 described above. The tip forming surface 33Z of the second female mold 3Z according to Modification 2 reaches the outer surface 3B and contacts the inner surface 2A of the first female mold 2. As shown in FIG. The endoscope hood manufactured by the molding die 1Z configured in this manner does not have an extending portion, and the disk portion constitutes the tip surface of the endoscope hood.

As noted above, the present invention has been described through the above-described embodiments, but the statements and drawings forming part of the disclosure in such embodiments should not be understood to limit the present invention. From such disclosure, various alternative embodiments, implementations and operational techniques will become apparent to those skilled in the art.

1, 1Y, 1Z: Forming mold 2: First female mold 2A: Inner surfaces 23, 23Y: Accommodating portion 24: Periphery forming surfaces 3, 3Z: Second female mold 3B: Outer surfaces 33, 33Z: Tip forming surface 331: First Tip forming surface 332 : Second tip forming surface 34 : Extension forming surface 35 : Opening forming part 4 : Male mold 43 : Opposing forming surface 431 : First opposing forming surface 432 : Second opposing forming surface 44 : Mounting forming surface 45 : Recessed portion 50 : Endoscope hood 51 : Exterior portion 52 : Disk portion 511 : Mounting portion 512 : Extension portion 53 : Forceps port (opening)
54: Water supply port (opening)
55: Distal end surface 56: Opposed surface 6, 6Y: Female mold 631: First distal end forming surface 632: Second distal end forming surface 100: Endoscope A: Axial direction S: Filling space X1: First direction X2: Second direction

Claims (6)

An endoscope that has a female mold and a male mold, fills a filling space between the female mold and the male mold with a material containing a hydrophilic monomer, and forms an endoscope hood through a copolymerization reaction of the material. A mold for a mirror hood, comprising:
The female mold has a tip forming surface corresponding to a tip surface positioned on the tip side of the endoscope hood,
The male mold has an opposing forming surface corresponding to the opposing surface facing the distal end surface of the endoscope hood ,
The endoscope hood has a disk portion and an exterior portion that is provided in a vertical direction from the outer circumference of the disk portion,
The exterior part has a mounting part that contacts the outer peripheral surface of the endoscope to which the endoscope hood is mounted, and an extension part that extends from the mounting part toward the distal end in the insertion direction,
The filling space has an extension space corresponding to the extension portion of the endoscope hood and a mounting space corresponding to the mounting portion of the endoscope hood. molding mold. The female mold has a first female mold and a second female mold,
The first female mold has an accommodating portion that accommodates the second female mold and the male mold,
The filling space is surrounded by the inner surface of the first female mold, the outer surface of the second female mold, and the outer surface of the male mold,
2. The molding die for an endoscope hood according to claim 1, wherein the inner surface of said first female mold has an outer peripheral surface corresponding to the outer peripheral surface of said endoscope hood. 3. The mold for an endoscope hood according to claim 1, wherein the width of said extension space is different from the width of said mounting space. at least one of the male mold and the female mold has a recess that continues to the filling space;
The mold for an endoscope hood according to any one of claims 1 to 3, wherein the recess extends in a direction away from the filling space. The male mold contact surface that contacts the female mold in the male mold and the female mold contact surface that contacts the male mold in the female mold taper toward the distal end side of the endoscope hood. The molding die for an endoscope hood according to any one of claims 1 to 4 , which has a tapered shape. The endoscope hood has an opening penetrating from the distal end surface to the opposing surface,
The endoscope hood according to any one of claims 1 to 5 , wherein at least one of the female mold and the male mold has an opening forming portion corresponding to the opening. molding mold.

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