JP7310976B2 - Medical cap and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a medical cap and its manufacturing method, and more particularly to a medical cap used for a drug solution container or an infusion solution container and its manufacturing method.

In general, the mouth of a drug solution container or infusion solution container used in the medical field includes an elastic stopper into which a transfusion needle can be inserted in order to sanitarily take out the liquid contained inside. cap is attached. Documents disclosing this type of medical cap include, for example, Japanese Patent Application Laid-Open No. 2010-220758 (Patent Document 1).

The medical cap disclosed in Patent Document 1 includes a substantially cylindrical elastic stopper and a substantially cylindrical upper frame that abuts against the outer edge of the upper surface of the elastic stopper and surrounds the peripheral surface of the elastic stopper. and a lower frame that abuts against the outer edge of the lower surface of the elastic plug and is assembled to the upper frame.

In the medical cap, the lower frame is formed by injection molding using a resin material in a state in which the elastic stopper is arranged inside the upper frame, so that the lower frame is formed from the upper frame and the elastic body. It is manufactured to adhere to both sides of the plug. With this configuration, the elastic stopper can be easily fixed to the upper frame and the lower frame, and the medical cap can be manufactured at low cost.

Here, in the medical cap disclosed in Patent Document 1, the elastic plug is pressed by the lower frame and bent upward (that is, the central portion of the elastic plug is configured to be held in a state of protruding upward from the portion). Such a configuration can be realized by locally applying compressive stress from the lower frame to the outer edge of the elastic plug during injection molding of the lower frame.

By adopting this configuration, the adhesion between the upper frame and the lower frame and the elastic stopper is enhanced, and a high degree of sealing can be ensured, and at the time of inserting the transfusion needle, It is possible to prevent the elastic plug from being displaced.

JP 2010-220758 A

However, when the above configuration is adopted, since the vicinity of the central portion of the lower surface of the elastic plug is always compressed, when the transfusion needle is inserted, this creates a large resistance to the insertion of the transfusion needle. becomes. Therefore, not only is there a problem that it is necessary to pierce the transfusion needle with a greater force, but it may also cause coring in some cases.

Therefore, the present invention has been made in view of the above-mentioned problems. An object of the present invention is to provide a medical cap capable of preventing displacement of an elastic stopper, and a method for manufacturing the same.

A medical cap according to the first aspect of the present invention comprises a substantially cylindrical elastic plug, an outer frame in which the elastic plug is disposed, and both the elastic plug and the outer frame. and a fixing portion made of resin for fixing the elastic plug to the outer frame by being fixed. The elastic plug has a first main surface and a second main surface that face each other, and a peripheral surface that connects to both the first main surface and the second main surface. A stepped surface is provided on the peripheral edge of the main surface. The outer frame body has a top plate portion facing the first main surface and a cylindrical side wall portion facing the peripheral surface with a distance therebetween. The top plate portion of is provided with an annular protrusion that abuts on the stepped surface. Of the space between the elastic plug and the outer frame, a space located radially outside of the elastic plug relative to the portion where the annular protrusion is located is filled with the fixing portion. The inner surface of the side wall portion is provided along the circumferential direction with a plurality of projecting portions whose tip surfaces located in the projecting direction contact the peripheral surface in a non-bonded state. A space between the elastic plug body and the side wall portion, excluding a portion where the projecting portion is located, is filled with the fixing portion.
A medical cap according to a second aspect of the present invention comprises a substantially cylindrical elastic plug, an outer frame in which the elastic plug is disposed, and both the elastic plug and the outer frame. and a fixing portion made of resin for fixing the elastic plug to the outer frame by being fixed. The elastic plug has a first main surface and a second main surface that face each other, and a peripheral surface that connects to both the first main surface and the second main surface. A stepped surface is provided on the peripheral edge of the main surface. The outer frame body has a top plate portion facing the first main surface and a cylindrical side wall portion facing the peripheral surface with a distance therebetween. The top plate portion of is provided with an annular protrusion that abuts on the stepped surface. Of the space between the elastic plug and the outer frame, a space located radially outside of the elastic plug relative to the portion where the annular protrusion is located is filled with the fixing portion. The peripheral surface is provided along the circumferential direction with a plurality of projecting portions whose tip surfaces located in the projecting direction contact the inner surface of the side wall portion in a non-bonded state. A space between the elastic plug body and the side wall portion, excluding a portion where the projecting portion is located, is filled with the fixing portion.

A method of manufacturing a medical cap according to the present invention has a first major surface and a second major surface positioned opposite each other, and a peripheral surface connecting both the first major surface and the second major surface. a step of preparing a substantially cylindrical elastic plug having a stepped surface on the periphery of the first main surface; a step of preparing an outer frame body provided with a portion, the first main surface facing the top plate portion, the peripheral surface facing the side wall portion with a distance, and the annular projection forming the a step of arranging the elastic plug inside the outer frame so as to abut on the stepped surface; By pouring a molten first resin material into the space between the side wall and hardening it to form a resin fixing portion that is fixed to both the elastic plug and the outer frame, the elastic and a step of fixing a plug to the outer frame. In the method for manufacturing a medical cap according to the present invention, in the step of fixing the elastic stopper to the outer frame, the annular projection is in contact with the stepped surface, so that the first By blocking the resin material, the space between the elastic plug and the outer frame, which is positioned radially outward of the elastic plug with respect to the portion where the annular projection is positioned, It is embedded by the fixing part.

In the method for manufacturing a medical cap according to the present invention, a plurality of protrusions are provided in advance on the inner surface of the side wall along the circumferential direction, so that the elastic plug body is attached to the outer frame body. In the step of arranging inside, the tip surface of the protruding portion located in the protruding direction abuts against the peripheral surface, whereby the elastic plug is positioned and arranged inside the outer frame, and the elastic plug is positioned and arranged inside the outer frame. In the step of fixing the elastic plug to the outer frame, a space between the elastic plug and the side wall portion, excluding a portion where the protrusion is located, is filled with the fixing portion. is preferred.

In the method for manufacturing a medical cap according to the present invention, the elastic stopper is arranged inside the outer frame by providing a plurality of projections along the circumferential direction in advance on the circumferential surface. In the above step, the tip surface of the projecting portion located in the projecting direction abuts against the inner surface of the side wall portion, whereby the elastic plug is positioned and arranged inside the outer frame, and the In the step of fixing the elastic plug to the outer frame, a space between the elastic plug and the side wall portion, excluding a portion where the protrusion is located, is filled with the fixing portion. is preferred.

In the method for manufacturing a medical cap according to the present invention, the step of preparing the outer frame includes: a first mold having a first molding surface for molding the outer surface of the outer frame; defined by the first mold and the second mold using a second mold having a second molding surface for molding the inner surface of the outer frame including the inner surface of the side wall portion; a step of manufacturing the outer frame by injection molding by pouring a molten second resin material into the first cavity and curing the material; and releasing the outer frame only from the second mold while maintaining the state of being held by the mold. In that case, it is preferable that the step of disposing the elastic plug inside the outer frame is performed while the outer frame is held by the first mold. wherein the step of fixing the elastic plug to the outer frame includes a third forming surface for forming the fixing portion while the outer frame is held by the first mold. and a part of the third mold is brought into contact with the second main surface, thereby defining the outer frame body, the elastic plug body, and the third mold Preferably, the molten first resin material is poured into the second cavity and hardened.

According to the present invention, it is possible to insert a transfusion needle with less force while ensuring a high sealing performance, and to prevent the elastic stopper from being displaced when the transfusion needle is inserted. A medical cap and a manufacturing method thereof can be provided.

Fig. 2 is a perspective view of the medical cap according to Embodiment 1 of the present invention, viewed obliquely from above; FIG. 2 is a plan view of the medical cap shown in FIG. 1; 3 is a cross-sectional view taken along line III-III shown in FIG. 2; FIG. 3 is a cross-sectional view taken along line IV-IV shown in FIG. 2; FIG. 4 is a cross-sectional view taken along line VV shown in FIG. 3; FIG. FIG. 6 is a perspective view of the outer frame body shown in FIGS. 1 to 5 as viewed obliquely from below; FIG. 6 is a perspective view of the elastic plug shown in FIGS. 1 to 5 as viewed obliquely from above and obliquely below; 4 is an enlarged view of regions VIIIA and VIIIB shown in FIG. 3; FIG. FIG. 4 is a cross-sectional view showing the method of manufacturing the medical cap according to Embodiment 1 of the present invention; FIG. 4 is a cross-sectional view showing the method of manufacturing the medical cap according to Embodiment 1 of the present invention; FIG. 4 is a cross-sectional view showing the method of manufacturing the medical cap according to Embodiment 1 of the present invention; FIG. 4 is a cross-sectional view showing the method of manufacturing the medical cap according to Embodiment 1 of the present invention; FIG. 4 is a cross-sectional view showing the method of manufacturing the medical cap according to Embodiment 1 of the present invention; FIG. 4 is a cross-sectional view showing the method of manufacturing the medical cap according to Embodiment 1 of the present invention; FIG. 4 is a cross-sectional view showing the method of manufacturing the medical cap according to Embodiment 1 of the present invention; Fig. 10 is a plan view of a medical cap according to Embodiment 2 of the present invention; FIG. 17 is a cross-sectional view taken along line XVII-XVII shown in FIG. 16; FIG. 17 is a cross-sectional view taken along line XVIII-XVIII shown in FIG. 16; FIG. 18 is a cross-sectional view taken along line XIX-XIX shown in FIG. 17; FIG. 20 is a perspective view of the outer frame shown in FIGS. 16 to 19 as viewed obliquely from below; 18 is an enlarged view of regions XXIA and XXIB shown in FIG. 17; FIG. Fig. 10 is a plan view of a medical cap according to Embodiment 3 of the present invention; FIG. 23 is a cross-sectional view taken along line XXIII-XXIII shown in FIG. 22; 23 is a cross-sectional view taken along line XXIV-XXIV shown in FIG. 22; FIG. FIG. 24 is a cross-sectional view taken along line XXV-XXV shown in FIG. 23; FIG. 26 is a perspective view of the outer frame body shown in FIGS. 22 to 25 as viewed obliquely from below; FIG. 26 is a perspective view of the elastic stopper shown in FIGS. 22 to 25 as seen obliquely from above and obliquely below;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiments shown below, the same or common parts are denoted by the same reference numerals in the drawings, and the description thereof will not be repeated.

(Embodiment 1)
FIGS. 1 and 2 are a perspective view and a plan view, respectively, of a medical cap according to Embodiment 1 of the present invention, viewed obliquely from above. 3 and 4 are cross-sectional views taken along lines III-III and IV-IV shown in FIG. 2, respectively, and FIG. 5 is a cross-sectional view taken along line VV shown in FIG. . FIG. 6 is a perspective view of the outer frame body shown in FIGS. 1 to 5 as viewed obliquely from below, and FIGS. 7A and 7B show the elastic plug body shown in FIGS. It is the perspective view seen from diagonally upwards and diagonally downwards. 8A and 8B are enlarged views of regions VIIIA and VIIIB shown in FIG. 3, respectively. First, a medical cap 1A according to the present embodiment will be described with reference to FIGS. 1 to 8. FIG.

As shown in FIGS. 1 to 5, the medical cap 1A includes an outer frame 10, an elastic stopper 40, and a fixing portion 50. As shown in FIGS. The outer frame body 10 includes a cup-shaped frame portion 20 and a lid portion 30 having a pull-top structure.

As shown in FIGS. 1 to 6, the outer frame 10 is made of, for example, a resin member in which the frame portion 20 and the lid portion 30 are integrally formed. The frame portion 20 has a substantially annular plate-shaped top plate portion 21 and a substantially cylindrical side wall portion 22 erected from the outer edge of the top plate portion 21, and has an opening at the lower end thereof. ing. The lid portion 30 has a cover portion 32 continuously provided from the inner edge of the substantially annular top plate portion 21, and a pull-top 31 pulled upward from a predetermined position of the cover portion 32. there is

As a material constituting the outer frame 10, a synthetic resin whose safety is generally established in medical applications can be used. Specifically, thermoplastic resins such as polyethylene, polypropylene, and polyethylene terephthalate, and thermoplastic elastomers such as olefin, styrene, polyurethane, polyester, polyvinyl chloride, and polybutadiene can be used as the synthetic resin. . In particular, it is preferable to use an olefinic thermoplastic elastomer as the synthetic resin. Note that the outer frame body 10 can be formed by, for example, injection molding using a mold, as will be described later.

As shown in FIGS. 3 to 5, 7A, and 7B, the elastic plug 40 has a flat, substantially columnar shape and is arranged inside the outer frame 10. ing. The elastic plug 40 has a first major surface 40a and a second major surface 40b which are positioned opposite to each other, and a peripheral surface 40c connected to both the first major surface 40a and the second major surface 40b. , the first main surface 40a of these constitutes an upper surface (also called a needle prick surface), and the second main surface 40b constitutes a lower surface (also called a wetted surface).

As a material constituting the elastic plug 40, rubber or thermoplastic elastomer, which is generally safe for medical use, can be used. Specifically, as the rubber, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, isoprene-isobutylene rubber, etc. can be used. Thermoplastic elastomers such as poly(vinyl chloride), polybutadiene, etc. can be used. The elastic plug 40 can be formed, for example, by injection molding using a mold.

As shown in FIGS. 1 to 5, the fixing portion 50 includes a substantially cylindrical cylindrical portion 51 and a substantially annular plate-shaped collar portion 52 extending outward from the lower end of the cylindrical portion 51. have. The fixing portion 50 is for fixing the elastic plug 40 to the outer frame 10 by being fixed to both the elastic plug 40 and the outer frame 10, and is made of a resin member. The fixed portion 50 is provided such that the cylindrical portion 51 is interposed between the outer frame 10 and the elastic plug 40 inside the outer frame 10 .

As the material constituting the fixed part 50, a synthetic resin whose safety is generally established in medical applications can be used. can be done. In particular, it is preferable to use an olefinic thermoplastic elastomer as the synthetic resin. The fixed portion 50 is formed by injection molding using a mold, as described later.

As shown in FIGS. 3 to 5, the first main surface 40a of the elastic plug 40 faces the top plate portion 21 of the outer frame 10, and the peripheral surface 40c of the elastic plug 40 faces the outer frame. 10 facing the side wall portion 22 . On the other hand, the portion on the upper end side of the cylindrical portion 51 of the fixing portion 50 is located between the peripheral surface 40c of the elastic plug 40 and the side wall portion 22 of the outer frame 10. A portion on the lower end side of 51 is positioned along the side wall portion 22 of the outer frame body 10 . Also, the flange portion 52 of the fixing portion 50 is pulled out to the outside through an opening provided at the lower end of the outer frame body 10 .

The upper end portion of the cylindrical portion 51 of the fixing portion 50 covers the peripheral surface 40c of the elastic plug 40, the outer edge of the first main surface 40a, and the outer edge of the second main surface 40b. It is fixed to the elastic stopper 40 . The tubular portion 51 of the fixed portion 50 covers the inner surface of the side wall portion 22 of the outer frame 10 and is fixed to the outer frame 10 at that portion. As a result, the elastic plug 40 is held by the fixing portion 50, and the fixing portion 50 holding the elastic plug 40 is joined to the outer frame 10. is fixed to the outer frame body 10.

The medical cap 1A configured in this manner is attached to a drug solution container or an infusion solution container used in the medical field so as to cover the opening thereof. Then, by pulling up the pull-top 31 with a finger or the like, the lid portion 30 including the pull-top 31 and the cover portion 32 is detached from the frame portion 20, so that the first main surface 40a, which is the needle sticking surface of the elastic plug 40, is exposed to the outside. , which allows the transfusion needle to be inserted into the elastic plug 40 .

Here, in the medical cap 1A according to the present embodiment, the elastic plug 40 fixed to the outer frame 10 via the fixing portion 50 is positioned in either the axial direction or the radial direction of the elastic plug 40. It is held in a near unloaded state so that it does not bend or compress substantially. By configuring in this way, it is possible to insert the transfusion needle with a smaller force, which facilitates handling and suppresses the occurrence of coring.

Thus, in order to fix the elastic plug 40 to the outer frame 10 in a near-no-load state, the injection molding for forming the fixing portion 50 should be substantially elastic. It is necessary to prevent plug 40 from being compressed either globally or locally. To this end, the elastic plug 40 should not be substantially compressed by the mold when a molten first resin material, which becomes the fixed part 50 when hardened, is injected into the cavity. , it is necessary to set the injection pressure of the first resin material to a considerably low level, but this alone may not be sufficient.

That is, if the injection pressure is set to be considerably low, the bonding strength of the fixing portion 50 to the outer frame body 10 and the elastic plug 40 may decrease. In some cases, it may be necessary to secure a larger joint area between the fixed part 50 and the elastic plug body 40 and a larger joint area between the fixed part 50 and the outer frame body 10 .

Therefore, in the medical cap 1A according to the present embodiment, as described above, the space between the peripheral surface 40c of the elastic plug 40 and the side wall portion 22 of the outer frame 10 is filled with the fixing portion 50. In addition, by covering the outer edge of the first main surface 40a and the outer edge of the second main surface 40b of the elastic plug 40 with the fixing portion 50, the above-described bonding area is ensured to be large.

On the other hand, if the mold is only brought into contact with the elastic plug 40 with a relatively weak force so that the elastic plug 40 is not substantially compressed during injection of the first resin material, , the first resin material may protrude out of the cavity through the contact portion between the mold and the elastic plug 40, and it is necessary to devise measures to prevent the protruding of the first resin material. Sometimes.

Further, when the mold is only brought into contact with the elastic plug 40 with a relatively weak force so that the elastic plug 40 is not substantially compressed during injection of the first resin material, The elastic plug 40 may not be properly positioned with respect to the outer frame 10, and the injection pressure of the first resin material may cause the elastic plug 40 to be displaced. be.

From the viewpoint of preventing the protrusion of the first resin material and the displacement of the elastic plug 40, the medical cap 1A according to the present embodiment has the following characteristic configuration.

As shown in FIGS. 3, 4, 6 and 8A, at a predetermined position of the top plate portion 21 of the outer frame 10, an annular wall projecting toward the inside of the outer frame 10 is provided. A portion 21a is provided. More specifically, the annular wall portion 21a is provided at a position inward from the outer edge of the top plate portion 21 by a predetermined distance.

The annular wall portion 21 a is a portion for blocking the molten first resin material during injection molding of the fixing portion 50 . The inner peripheral surface of the annular wall portion 21 a abuts on the stepped surface provided on the first main surface 40 a of the elastic plug 40 while being in contact with the first main surface 40 a.

As a result, when the fixing portion 50 is injection-molded, it is possible to prevent the first resin material from protruding out of the cavity at the portion of the elastic plug 40 on the first main surface 40a side. Therefore, the fixing portion 50 is embedded in the space radially outside the annular wall portion 21a and positioned between the elastic plug 40 and the outer frame 10. It is possible to prevent the first main surface 40 a , which is a surface, from being covered with the fixing portion 50 .

As shown in FIGS. 3, 4, 7B, and 8B, at a predetermined position on the second main surface 40b of the elastic plug 40, there is a A protruding annular protrusion 42 is provided, and at a predetermined position of the tubular portion 51 of the fixed portion 50, a substantially annular plate-shaped support portion 51a protruding toward the inside of the tubular portion 51 is provided. there is More specifically, the annular projection 42 is provided on the second main surface 40b at a position inward from the peripheral surface 40c of the elastic plug 40 by a predetermined distance. It is provided so as to cover the outer edge of the second main surface 40b.

The annular projection 42 is formed by a mold (in the present embodiment, a third mold to be described later) arranged so as to abut against the second main surface 40b of the elastic plug 40 when the fixing portion 50 is injection molded. 300 (see FIGS. 13 to 15)) to block the molten first resin material. More specifically, the annular protrusion 42 is provided so that the tip portion positioned in the projecting direction of the annular protrusion 42 abuts against the mold during the injection molding of the fixing portion 50 .

This prevents the first resin material from protruding out of the cavity at the portion of the elastic plug 40 on the second main surface 40b side during the injection molding of the fixing portion 50 . Therefore, the support portion 51a of the fixed portion 50 is formed radially outward of the annular projection 42, and the second main surface 40b, which is the wetted surface of the elastic plug 40, It is possible to prevent being covered by

Here, in the present embodiment, the annular protrusion 42 has a mountain-like shape in a cross section including the central axis of the elastic plug 40 , and the second The inner end portion of the support portion 51a, which is the portion positioned on the main surface 40b, is positioned near the apex of the mountain-shaped annular protrusion 42, but the inner end portion of the support portion 51a 8(B), and further outside the annular projection 42. may

By configuring in this way, compared to the case where the annular protrusion 42 is not provided, a cavity (in the present embodiment, a second cavity C2 described later) that is a space filled with the first resin material during injection molding (refer to FIG. 14)) and the portion of the elastic plug 40 to be punctured with a needle on the second main surface 40b of the elastic plug 40 can be ensured to be long. As a result, it is possible to effectively prevent the first resin material from protruding into the portion where the needle stick is planned.

In other words, the annular projection 42 not only exhibits the function of blocking the molten first resin material by cooperating with the mold described above, but also prevents the first resin material from leaking out of the cavity. , which also has the function of preventing it from reaching where the needle stick is intended.

As shown in FIGS. 3, 4 and 7(B), a gentle slope is formed on the second main surface 40b of the elastic stopper 40 inside the position where the annular protrusion 42 is provided. A substantially conical recess 41 is provided. This concave portion 41 reduces the thickness of the central portion of the elastic plug 40 to reduce the resistance when the transfusion needle is inserted. In addition, the inner end portion of the cavity and the portion of the elastic plug 40 to be punctured with a needle are to be prevented from being applied to the elastic plug 40 by the molded mold. , on the second main surface 40b of the elastic plug 40, to ensure a longer distance.

As shown in FIGS. 2 to 6, on the inner surface of the side wall portion 22 of the outer frame 10, there extends along the axial direction of the outer frame 10 (that is, the axial direction of the substantially cylindrical side wall portion 22). A plurality of ridges 22a are provided. The plurality of ridges 22a are evenly arranged along the circumferential direction of the side wall 22 so as to be parallel to each other. In the present embodiment, four ridges 22a are provided at intervals of 90° from each other. In addition, in FIG. 2, the inner surface of the side wall portion 22 provided with the plurality of protrusions 22a is indicated by broken lines.

The plurality of ridges 22a constitute projections that come into contact with the peripheral surface 40c of the elastic plug 40, and when the fixing part 50 is injection molded, the elastic plug 40 is attached to the outer frame 10. It functions as a positioning part when positioning. More specifically, each of the plurality of ridges 22a has a tip end surface positioned in the projecting direction abutting against the peripheral surface 40c of the elastic plug 40, thereby allowing the central axis of the elastic plug 40 and the outer frame It is configured so that it is aligned with the central axis of the body 10 .

In this way, by providing a plurality of ridges 22a on the inner surface of the side wall 22 of the outer frame 10, the peripheral surface 40c of the elastic plug 40 and the inner surface of the side wall 22 of the outer frame 10 are aligned. Of the substantially cylindrical space between them, the space excluding the portions where the plurality of ridges 22a are located is filled with the tubular portion 51 of the fixing portion 50 described above. As a result, the joint area between the outer frame body 10 and the fixed part 50 is also increased, and in this respect also, the joint strength of the fixed part 50 to the outer frame body 10 is improved.

It should be noted that the plurality of ridges 22a do not necessarily need to be provided evenly along the circumferential direction of the side wall 22, and may be provided unevenly. Moreover, the number of the plurality of protrusions 22a is not limited to four, and may be any number as long as it is two or more. Furthermore, it is not always necessary to form the projecting portion that abuts on the peripheral surface 40c of the elastic stopper 40 with a plurality of ridges 22a as described above. Alternatively, it may be composed of a plurality of ridges intermittently provided in the circumferential direction of the side wall portion 22, or a single ridge provided spirally on the inner surface of the side wall portion 22. It may be composed of one or a plurality of ridges.

Further, as shown in FIGS. 4 and 6, a projecting holding portion 22a1 is provided at a predetermined position on the end surface of each of the plurality of projecting streaks 22a located in the projecting direction. The holding portion 22a1 is a portion for holding the elastic plug 40 by coming into contact with the outer edge of the second main surface 40b of the elastic plug 40. manifested in time.

That is, in the case where the holding portion 22a1 described above is not provided, the elastic stopper 40 is in a state before the fixing portion 50 is formed, and the plurality of protrusions provided on the side wall portion 22 of the outer frame body 10 22a, but if the holding portion 22a1 is provided, the elastic plug 40 can be easily positioned in the axial direction with respect to the outer frame 10, and can be prevented from falling off. be possible. Note that the holding portion 22a1 is not necessarily an essential component, and may be provided as necessary.

As described above, in the medical cap 1A according to the present embodiment, the annular protrusion 42 is provided on the second main surface 40b of the elastic plug 40, and the second main surface of the fixing portion 50 is provided. The inner end located on 40 b is configured to be located outside the innermost portion of the surface of the annular projection 42 , so that the first resin material for forming the fixing portion 50 is reduced. During injection molding, the first resin material is prevented from protruding.

Further, in the medical cap 1A according to the present embodiment, the inner surface of the side wall portion 22 of the outer frame 10 is provided with a plurality of protrusions 22a abutting on the peripheral surface 40c of the elastic plug 40, and the elastic plug Of the space between the body 40 and the side wall portion 22, the space excluding the portions where the plurality of ridges 22a are located is configured to be filled with the fixing portion 50, whereby the fixing portion 50 is This prevents the elastic plug 40 from being displaced during the injection molding of the first resin material for forming.

Therefore, by adopting the above configuration, it is possible to fix the elastic plug 40 to the outer frame 10 in a near-no-load state as described above. Therefore, when inserting the transfusion needle, the insertion can be performed with a smaller force, which not only facilitates handling but also suppresses the occurrence of coring.

Furthermore, by adopting the above configuration, the space between the peripheral surface 40c of the elastic stopper 40 and the side wall portion 22 of the outer frame 10 is filled with the fixing portion 50, thereby ensuring high sealing performance. It becomes possible to increase the bonding strength. Therefore, it is possible to prevent the elastic plug 40 from being displaced when the transfusion needle is inserted.

Therefore, by using the medical cap 1A according to the present embodiment, it is possible to insert the transfusion needle with less force while ensuring high sealing performance, and at the time of inserting the transfusion needle, the elastic plug can be used. A medical cap that can prevent the body 40 from being displaced can be provided.

It should be noted that it is not always necessary to simultaneously adopt the configuration for preventing the first resin material from protruding and the configuration for preventing the position of the elastic plug 40 from shifting during the injection molding of the fixing portion 50 . However, even if only one of these is adopted, the insertion of the transfusion needle can be performed with less force while ensuring a high degree of sealing, and the elastic plug is used when the transfusion needle is inserted. It is possible to provide a medical cap that can prevent the position of 40 from being shifted.

9 to 15 are cross-sectional views for explaining the method of manufacturing the medical cap according to the present embodiment described above. Next, a method for manufacturing the medical cap 1A according to the present embodiment will be specifically described with reference to FIGS. 9 to 15. FIG. The method of manufacturing the medical cap shown in the present embodiment uses so-called two-color molding, but it is not always necessary to use two-color molding, and at least the fixing portion 50 is formed by injection molding. Just do it.

As shown in FIG. 9, first, a second mold 200 having a predetermined shape is arranged so as to face a first mold 100 having a predetermined shape, and the second mold 200 moves along the direction of the arrow shown in the figure. 1 is moved toward the mold 100 . Here, the first mold 100 has a first molding surface 101 for molding the outer surface of the outer frame 10, and the second mold 200 is for forming the above-described side wall portion 22 of the outer frame 10. It has a second molding surface 201 for molding the inner surface including the inner surface.

As shown in FIG. 10, by fitting the second mold 200 to the first mold 100, a first cavity C1 is formed between the first mold 100 and the second mold 200. will be The first cavity C1 corresponds to the shape of the outer frame 10 and is defined by the first molding surface 101 and the second molding surface 201 described above.

Next, as shown in FIG. 11, the melted second resin material that will form the outer frame 10 is poured into the first cavity C1 through a gate (not shown), and the second resin material is cured. An outer frame body 10 is formed. At that time, the outer frame body 10 is formed as a single member by integrally providing the frame portion 20 and the lid portion 30 described above. In this case, the inner surface of the side wall portion 22 of the outer frame body 10 is formed with a plurality of protrusions 22a each having a holding portion 22a1.

Next, as shown in FIG. 12, the second mold 200 is moved away from the first mold 100 along the direction of the arrow shown in the drawing. is released from the mold. At this time, by preventing the outer frame 10 from being released from the first mold 100 , the outer frame 10 is maintained in a state of being held by the first mold 100 .

Next, as shown in FIG. 13, the elastic stopper 40 is arranged inside the outer frame 10 held by the first mold 100 .

Here, the elastic plug 40 is arranged so that its peripheral surface 40c abuts on the tips of the plurality of ridges 22a provided on the side wall 22 of the outer frame 10. As shown in FIG. As a result, the central axis of the elastic plug 40 is aligned with the central axis of the outer frame 10, and the elastic plug 40 is positioned in the direction orthogonal to the axial direction of the elastic plug 40. FIG.

The elastic plug 40 is arranged such that its first main surface 40a abuts on the tip of the annular wall portion 21a provided on the top plate portion 21 of the outer frame 10, and its second main surface The outer edge of 40b is arranged to be held by holding portions 22a1 provided on the plurality of ridges 22a of the outer frame body 10. As shown in FIG. As a result, the elastic plug 40 is positioned in the axial direction.

Next, as shown in FIG. 13, a third mold 300 having a predetermined shape is arranged so as to face the first mold 100 holding the outer frame 10 with the elastic stopper 40 disposed therein. The third mold 300 is moved toward the first mold 100 along the arrow direction shown therein. Here, the third mold 300 has a third molding surface 301 for forming the fixing portion 50, and at a predetermined position of the third molding surface 301, the support portion 51a of the fixing portion 50 described above is provided. A stepped portion 302 is provided for molding.

As shown in FIG. 14, the third mold 300 is fitted to the first mold 100 holding the outer frame 10 in which the elastic plug 40 is arranged, thereby forming the outer frame 10 and the elastic plug. A second cavity C<b>2 is formed between the body 40 and the first mold 100 and the third mold 300 . The second cavity C2 corresponds to the shape of the fixing portion 50 and is mainly defined by the outer frame body 10, the elastic plug body 40, and the third molding surface 301 described above.

Next, as shown in FIG. 15, the molten first resin material that forms the fixing portion 50 is poured into the second cavity C2 through a gate (not shown), and the first resin material is cured, thereby fixing. A portion 50 is formed. As a result, the elastic stopper 40 arranged inside the outer frame 10 is fixed to the outer frame 10 via the fixing portion 50 .

At that time, the first resin material that has flowed into the portion of the second cavity C2 defined by the top plate portion 21 of the outer frame body 10 and the first main surface 40a of the elastic plug 40 It is dammed up by the annular wall portion 21a provided in the inner wall portion 21a and the elastic plug member 40 in contact with the annular wall portion 21a. As a result, the fixing portion 50 fills the space radially outside the annular wall portion 21a and positioned between the elastic plug 40 and the outer frame 10, thereby preventing the elastic plug 40 from being punctured by a needle. The first main surface 40a, which is a surface, is not covered with the fixing portion 50 (see FIG. 8A, etc.).

At that time, the first resin material that has flowed into the portion of the second cavity C2 defined by the stepped portion 302 provided on the third molding surface 301 and the elastic plug 40 It is dammed up by the annular projection 42 provided on the second main surface 40b of and the third mold 300 in contact with the annular projection 42 . As a result, the inner end portion of the fixing portion 50 located on the second main surface 40b of the elastic plug 40 (that is, the tip portion of the support portion 51a) is positioned outside the innermost portion of the annular protrusion 42. Therefore, the second main surface 40b, which is the wetted surface of the elastic plug 40, is not covered with the fixing portion 50 (see FIG. 8(B), etc.).

Further, at that time, the plurality of ridges 22a provided on the side wall 22 of the outer frame 10 in the space between the elastic plug 40 and the outer frame 10 in the second cavity C2 are positioned. The space excluding the portion where the connection is made is filled with the first resin material, and the fixing portion 50 is formed in the space (see FIGS. 3 and 5, etc.).

Next, the first mold 100 and the third mold 300 are separated from the medical cap 1A in which the elastic stopper 40 is fixed to the outer frame 10 via the fixing portion 50, thereby forming a medical cap. Cap 1A is removed. Thus, the manufacture of the medical cap 1A is completed.

By manufacturing a medical cap using such a manufacturing method, a transfusion needle can be inserted with less force while ensuring high sealing performance, and the cap can be elastic when the transfusion needle is inserted. It is possible to easily manufacture the medical cap 1A that can prevent the stopper 40 from being displaced.

(Embodiment 2)
16 is a plan view of a medical cap according to Embodiment 2 of the present invention. FIG. 17 and 18 are cross-sectional views taken along lines XVII-XVII and XVIII-XVIII respectively shown in FIG. 16, and FIG. 19 is a cross-sectional view taken along line XIX-XIX shown in FIG. . FIG. 20 is a perspective view of the outer frame body shown in FIGS. 16 to 19 as viewed obliquely from below, and FIGS. 21A and 21B are enlarged views of regions XXIA and XXIB shown in FIG. It is a diagram. A medical cap 1B according to the present embodiment will be described below with reference to FIGS. 16 to 21. FIG.

As shown in FIGS. 16 to 19, a medical cap 1B according to the present embodiment has an elastic plug body having a flat and substantially cylindrical shape when compared with the medical cap 1A according to the first embodiment described above. 40 is slightly smaller in diameter, and along with this, the projection height of the plurality of ridges 22a provided on the inner surface of the side wall 22 of the outer frame body 10 is increased accordingly. The main difference is that the top plate portion 21 of the outer frame body 10 is provided with an annular projection 21b instead of the annular wall portion 21a described above.

Specifically, as shown in FIGS. 16 to 20, a plurality of ridges 22a extending along the axial direction of the outer frame 10 are provided on the inner surface of the side wall 22 of the outer frame 10. In the present embodiment, four ridges 22a are provided at intervals of 90° from each other. In addition, in FIG. 16, the inner surface of the side wall portion 22 provided with the plurality of protrusions 22a is indicated by broken lines.

Here, as shown in FIGS. 18 and 19, each of the plurality of projections 22a has a distal end surface positioned in each projecting direction, as in the case of the first embodiment described above. 40c, so that the central axis of the elastic plug 40 and the central axis of the outer frame 10 are aligned. Therefore, as shown in FIGS. 17 and 19, in the substantially cylindrical space between the peripheral surface 40c of the elastic plug 40 and the inner surface of the side wall 22 of the outer frame 10, the plurality of ridges 22a The space excluding the portion where is located is filled with the cylindrical portion 51 of the fixing portion 50 .

As shown in FIGS. 17, 18, 20 and 21A, at a predetermined position of the top plate portion 21 of the outer frame 10, an annular projection protruding toward the inside of the outer frame 10 is provided. 21b is provided. More specifically, the annular projection 21b is provided at a position inward from the outer edge of the top plate portion 21 by a predetermined distance. It consists of a projection with a smaller external shape that is triangular in cross-section with a pointed tip.

The top plate portion 21 in the vicinity of the portion where the annular projection 21b is provided is in close contact with the outer edge of the first main surface 40a of the elastic plug 40, so that the annular projection 21b bites into the elastic plug 40. . The annular protrusion 21b is a portion for blocking the melted first resin material when the fixing portion 50 is injection molded.

As a result, when the fixing portion 50 is injection-molded, it is possible to prevent the first resin material from protruding out of the cavity at the portion of the elastic plug 40 on the first main surface 40a side. Therefore, the fixing portion 50 is embedded in the space located between the peripheral surface 40c of the elastic plug 40 and the outer frame 10, and the first main surface 40a, which is the needle sticking surface of the elastic plug 40, is Covering with the fixed part 50 can be prevented.

On the other hand, as shown in FIGS. 17, 18 and 21(B), an annular protrusion projecting toward the opposite side of the first main surface 40a is provided at a predetermined position on the second main surface 40b of the elastic plug 40. A portion 42 is provided, and at a predetermined position of the cylindrical portion 51 of the fixed portion 50, a support portion 51a having a substantially annular plate shape and projecting toward the inside of the cylindrical portion 51 is provided. The configurations of the annular protrusion 42 and the support portion 51a are the same as those in the first embodiment described above.

As a result, as in the case of the first embodiment described above, during the injection molding of the fixing portion 50, the first resin material enters the outside of the cavity at the portion on the second main surface 40b side of the elastic plug 40. It will be possible to prevent it from coming out. Therefore, the support portion 51a of the fixed portion 50 is formed radially outward of the annular projection 42, and the second main surface 40b, which is the wetted surface of the elastic plug 40, It is possible to prevent being covered by

Even in this configuration, it is possible to fix the elastic plug 40 to the outer frame 10 in a near-no-load state, as in the case of the first embodiment described above. Therefore, by adopting this configuration, the insertion of the transfusion needle can be performed with a smaller force while ensuring a high sealing performance, and the elastic plug 40 is prevented from being displaced when the transfusion needle is inserted. It is possible to provide a medical cap that can prevent the cap from falling off.

The medical cap 1B in the present embodiment can be manufactured by a manufacturing method according to the manufacturing method of the medical cap 1A described in the first embodiment, although the description thereof is omitted here. .

(Embodiment 3)
22 is a plan view of a medical cap according to Embodiment 3 of the present invention. FIG. 23 and 24 are cross-sectional views taken along line XXIII-XXIII and line XXIV-XXIV shown in FIG. 22, respectively, and FIG. 25 is a cross-sectional view taken along line XXV-XXV shown in FIG. . FIG. 26 is a perspective view of the outer frame body shown in FIGS. 22 to 25 as viewed obliquely from below, and FIGS. It is the perspective view seen from diagonally upwards and diagonally downwards. A medical cap 1C according to the present embodiment will be described below with reference to FIGS. 22 to 27. FIG.

As shown in FIGS. 22 to 27, the medical cap 1C according to the present embodiment has a plurality of projections on the side wall portion 22 of the outer frame body 10 when compared with the medical cap 1A according to the first embodiment described above. The main difference is that the ridge 22a is not provided, and instead, a plurality of protrusions 43 are provided on the peripheral surface 40c of the elastic plug 40. FIG.

Specifically, as shown in FIGS. 22 to 25, 27(A) and 27(B), the peripheral surface 40c of the elastic plug 40 has a plurality of projections protruding outward from the peripheral surface 40c. are provided, and in the present embodiment, a plurality of protrusions 43 are provided four at intervals of 90° with a space therebetween. In FIG. 22, the peripheral surface 40c of the elastic plug 40 provided with the plurality of protrusions 43 is indicated by broken lines.

On the other hand, as shown in FIGS. 23 to 26, the inner surface of the side wall portion 22 of the outer frame body 10 is not provided with the plurality of protrusions 22a (see FIG. 6, etc.). is generally composed of a circumferential surface.

The plurality of protrusions 43 described above constitute protrusions that abut against the inner surface of the side wall 22 of the outer frame 10 . It functions as a positioning part when positioning with respect to. More specifically, each of the plurality of projections 43 has a tip end surface positioned in the projecting direction in contact with the inner surface of the side wall portion 22 . It is configured so that it is aligned with the central axis.

By providing the plurality of protrusions 43 on the peripheral surface 40c of the elastic plug 40 in this way, the substantially cylindrical shape between the peripheral surface 40c of the elastic plug 40 and the inner surface of the side wall 22 of the outer frame 10 is formed. The space excluding the portions where the plurality of protrusions 43 are positioned is filled with the cylindrical portion 51 of the fixing portion 50 . As a result, the joint area between the outer frame body 10 and the fixing portion 50 is also increased.

It should be noted that the plurality of protrusions 43 need not necessarily be provided evenly along the circumferential direction of the peripheral surface 40c of the elastic plug body 40, and may be provided unevenly. Moreover, the number of the plurality of protrusions 43 is not limited to four, and may be any number as long as it is two or more. Furthermore, it is not always necessary to form the projections that abut against the inner surface of the side wall 22 of the outer frame 10 by a plurality of projections 43 as described above, and for example, they are formed by a plurality of spot-shaped projections. Alternatively, it may be composed of a plurality of ridges intermittently provided in the circumferential direction of the elastic plug 40, or may be spirally formed on the peripheral surface 40c of the elastic plug 40. This may consist of a single or multiple ridges provided.

As shown in FIGS. 23 and 24 , an annular wall portion 21 a having an annular shape protruding toward the inside of the outer frame 10 is provided at a predetermined position of the top plate portion 21 of the outer frame 10 . The configuration of this annular wall portion 21a is the same as that in the first embodiment described above.

As a result, as in the case of the first embodiment described above, during the injection molding of the fixing portion 50, the first resin material intrudes into the outside of the cavity at the portion of the elastic plug 40 on the first main surface 40a side. It will be possible to prevent it from coming out. Therefore, the fixing portion 50 is embedded in the space radially outside the annular wall portion 21a and positioned between the elastic plug 40 and the outer frame 10. It is possible to prevent the first main surface 40 a , which is a surface, from being covered with the fixing portion 50 .

On the other hand, as shown in FIGS. 23 and 24, an annular protrusion 42 is provided at a predetermined position on the second main surface 40b of the elastic plug 40 and protrudes toward the side opposite to the first main surface 40a. At a predetermined position of the cylindrical portion 51 of the fixed portion 50, a support portion 51a having a substantially annular plate shape and protruding toward the inner side of the cylindrical portion 51 is provided. The configurations of the annular protrusion 42 and the support portion 51a are the same as those in the first embodiment described above.

As a result, as in the case of the first embodiment described above, during the injection molding of the fixing portion 50, the first resin material enters the outside of the cavity at the portion on the second main surface 40b side of the elastic plug 40. It will be possible to prevent it from coming out. Therefore, the support portion 51a of the fixed portion 50 is formed radially outward of the annular projection 42, and the second main surface 40b, which is the wetted surface of the elastic plug 40, It is possible to prevent being covered by

Even in this configuration, it is possible to fix the elastic plug 40 to the outer frame 10 in a near-no-load state, as in the case of the first embodiment described above. Therefore, by adopting this configuration, the insertion of the transfusion needle can be performed with a smaller force while ensuring a high sealing performance, and the elastic plug 40 is prevented from being displaced when the transfusion needle is inserted. It is possible to provide a medical cap that can prevent the cap from falling off.

The medical cap 1C in the present embodiment can be manufactured by a manufacturing method according to the manufacturing method of the medical cap 1A described in the first embodiment, although the description thereof is omitted here. .

In the first to third embodiments of the present invention described above, the case of manufacturing a medical cap by two-color molding has been illustrated and explained, but as described above, this can be manufactured without using two-color molding. Of course, it is also possible. For example, the injection molding of the outer frame body and the fixing portion may be performed using separate molds instead of using a common first mold.

Moreover, the characteristic configurations disclosed in the first to third embodiments of the present invention described above can naturally be combined with each other without departing from the gist of the present invention.

Thus, the above-described embodiments disclosed this time are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the scope of claims, and includes all changes within the meaning and scope of equivalents to the description of the scope of claims.

1A to 1C medical cap, 10 outer frame, 20 frame, 21 top plate, 21a annular wall, 21b annular projection, 22 side wall, 22a ridge, 22a1 holding portion, 30 lid, 31 pull top, 32 cover portion 40 elastic plug body 40a first main surface 40b second main surface 40c peripheral surface 41 recess 42 annular protrusion 43 protrusion 50 fixing portion 51 cylindrical portion 51a support portion 52 collar portion 100 first mold 101 first molding surface 200 second mold 201 second molding surface 300 third mold 301 third molding surface 302 step portion C1 first cavity C2 Second cavity.

Claims (6)

a substantially cylindrical elastic plug;
an outer frame in which the elastic plug is arranged;
a resin fixing part that fixes the elastic plug to the outer frame by being fixed to both the elastic plug and the outer frame;
the elastic plug has first and second main surfaces facing each other; and a peripheral surface connected to both the first and second main surfaces,
A step surface is provided on the peripheral edge of the first main surface,
The outer frame body has a top plate portion facing the first main surface and a cylindrical side wall portion facing the peripheral surface with a distance therebetween,
The top plate portion at a position corresponding to the peripheral edge of the first main surface is provided with an annular protrusion that contacts the stepped surface,
a space between the elastic plug and the outer frame that is positioned radially outward of the elastic plug with respect to a portion where the annular projection is positioned is filled with the fixing portion ;
The inner surface of the side wall portion is provided with a plurality of projecting portions along the circumferential direction, the tip surfaces of which are positioned in the projecting direction and contact the peripheral surface in a non-bonded state,
A medical cap, wherein a space between the elastic plug body and the side wall portion, excluding a portion where the projecting portion is located, is filled with the fixing portion. a substantially cylindrical elastic plug;
an outer frame in which the elastic plug is arranged;
a resin fixing part that fixes the elastic plug to the outer frame by being fixed to both the elastic plug and the outer frame;
the elastic plug has first and second main surfaces facing each other; and a peripheral surface connected to both the first and second main surfaces,
A step surface is provided on the peripheral edge of the first main surface,
The outer frame body has a top plate portion facing the first main surface and a cylindrical side wall portion facing the peripheral surface with a distance therebetween,
The top plate portion at a position corresponding to the peripheral edge of the first main surface is provided with an annular protrusion that contacts the stepped surface,
a space between the elastic plug and the outer frame that is positioned radially outward of the elastic plug with respect to a portion where the annular projection is positioned is filled with the fixing portion ;
The peripheral surface is provided with a plurality of projecting portions along the circumferential direction, the tip surfaces of which are positioned in the projecting direction and contact the inner surface of the side wall portion in a non-bonded state,
A medical cap, wherein a space between the elastic plug body and the side wall portion, excluding a portion where the projecting portion is located, is filled with the fixing portion. It has a first main surface and a second main surface that face each other, and a peripheral surface that connects to both the first main surface and the second main surface, and a stepped surface is provided on the peripheral edge of the first main surface. a step of preparing a substantially cylindrical elastic stopper provided;
a step of preparing an outer frame body having a top plate portion and a cylindrical side wall portion, wherein the top plate portion is provided with an annular protrusion;
The elastic plug body is mounted on the outer frame so that the first main surface faces the top plate portion, the peripheral surface faces the side wall portion with a distance therebetween, and the annular protrusion contacts the stepped surface. placing inside the body;
In a state in which the elastic plug is arranged inside the outer frame, the molten first resin material is poured into the space between the elastic plug and the side wall, and then the first resin material is cured. a step of fixing the elastic plug to the outer frame by forming a resin fixing portion that is fixed to both the elastic plug and the outer frame by pressing the elastic plug,
In the step of fixing the elastic plug body to the outer frame body, the first resin material is dammed by the annular projection coming into contact with the stepped surface, whereby the elastic plug body and the outer frame body are dammed. A method of manufacturing a medical cap, wherein a space between the frame and the elastic plug located radially outside of a portion where the annular protrusion is located is filled with the fixing portion. Since a plurality of projections are provided along the circumferential direction in advance on the inner surface of the side wall, in the step of arranging the elastic plug body inside the outer frame, the projections are projected in the direction of projection. In the step of positioning and arranging the elastic plug body inside the outer frame body and fixing the elastic plug body to the outer frame body by abutting the located tip surface against the peripheral surface, 4. The method of manufacturing a medical cap according to claim 3 , wherein a space between the elastic stopper and the side wall portion, excluding a portion where the projecting portion is located, is filled with the fixing portion. A plurality of protrusions are provided in advance on the peripheral surface along the circumferential direction, so that in the step of arranging the elastic plug body inside the outer frame body, the protrusions are positioned in the direction of protrusion. In the step of positioning and arranging the elastic plug body inside the outer frame body and fixing the elastic plug body to the outer frame body by the surface abutting against the inner side surface of the side wall, 4. The method of manufacturing a medical cap according to claim 3 , wherein a space between the elastic stopper and the side wall portion, excluding a portion where the projecting portion is located, is filled with the fixing portion. The step of preparing the outer frame includes forming the inner surface of the outer frame including the inner surface of the side wall with a first mold having a first molding surface for molding the outer surface of the outer frame. a second mold having a second molding surface for forming a molten second resin material into a first cavity defined by the first mold and the second mold; a step of manufacturing the outer frame by curing the second resin material; and releasing the outer frame only from the second mold,
The step of disposing the elastic plug inside the outer frame is performed while the outer frame is held by the first mold,
The step of fixing the elastic stopper to the outer frame includes forming a third molding surface for molding the fixing portion while the outer frame is held by the first mold. Using three molds, a portion of the third mold is brought into contact with at least a portion of the second main surface, thereby forming the first resin material into the outer frame body, the elastic stopper and the 6. The method of manufacturing a medical cap according to any one of claims 3 to 5 , wherein said first resin material is poured into a second cavity defined by a third mold and then cured.

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