JP2018012025A - Syringe with injection needle and manufacturing method of syringe with injection needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a syringe with an injection needle, even when sterilization by an autoclave or ethylene oxide gas is applied and stress that fastens the injection needle is generated, firmly joining the injection needle to an outer cylinder without causing decrease in joint strength between the injection needle and the outer cylinder.SOLUTION: A syringe 1 with an injection needle includes: an outer cylinder 2 molded with a resin, including a cylinder tip 21 at a distal end, an opening 25 at a proximal end, and a barrel part 23 having an inner cavity 22 filled with a drug solution 5, located therebetween; a joint portion 30 fixed to the cylinder tip 21; and an injection needle 3 projecting beyond the cylinder tip 21 at the distal end side, and allowing communication between the inside and outside of the outer cylinder 2, the injection needle 3 being fixed to the cylinder tip 21 by insert molding or heat welding. An uneven portion 32 having an average surface roughness of 0.2 μm or more is formed in a region having an area of 1 mmor more on an outer peripheral surface of the joint portion 30. The resin covers the uneven portion 32 in close contact therewith, so that sterilization by an autoclave or ethylene oxide gas is applied to the outer cylinder 2 having the injection needle 3 fixed thereto.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a syringe with an injection needle in which an injection needle is directly joined to an outer cylinder.

  The syringe with a syringe needle is obtained by previously joining a syringe needle to a cylindrical tip of a resin-made outer cylinder. A syringe with an injection needle is used for a prefilled syringe that contains a chemical solution in advance or a microsyringe that administers a small amount. Patent Document 1 describes a method of manufacturing a syringe with a syringe needle in which a metal syringe needle is joined to a resin outer cylinder. The resin outer cylinder is molded by injection molding. At this time, the injection needle is fixed by protruding the joint portion into the cavity where the tube tip portion of the outer cylinder of the injection mold is molded. Therefore, the joint outer peripheral surface of the injection needle is covered with resin by injecting molten thermoplastic resin into the cavity. The injection needle is bonded to the outer cylinder by contracting the resin when cooled and solidified, and generating a stress that tightens the injection needle. According to this manufacturing method, since it is not necessary to use an adhesive for joining the injection needle and the outer cylinder, there is no risk of the chemical solution in the outer cylinder being contaminated by the adhesive, and it is safe and has a stable quality. Can mass-produce things.

International Publication No. 2008/139882

  Since medical devices such as syringes with needles must be clean, they are sterilized with autoclave or ethylene oxide gas after they are manufactured. Sterilization with an autoclave or ethylene oxide gas involves a temperature load. This temperature load increases the fluidity of the resin forming the outer cylinder, relaxes the tightening stress of the injection needle, and decreases the bonding strength between the injection needle and the outer cylinder. For this reason, in the syringe with an injection needle described in Patent Document 1, the bonding strength between the injection needle and the outer cylinder is greatly reduced by the sterilization treatment with autoclave or ethylene oxide gas, and the injection needle is unintentionally dropped from the outer cylinder. Or the needle may be pushed into the outer cylinder at the time of puncture.

  The present invention has been made to solve the above-mentioned problems, and is sterilized by an autoclave or ethylene oxide gas, thereby increasing the fluidity of the resin forming the outer cylinder and reducing the tightening stress of the injection needle. Even so, an object of the present invention is to provide a syringe with a syringe needle in which the joint strength between the injection needle and the outer cylinder is not greatly reduced, and the injection needle is securely joined to the outer cylinder.

A syringe with a syringe needle to which the present invention is applied has a cylinder tip at a distal end, an opening at a proximal end, and a body portion provided with an inner space filled with a chemical solution therebetween, and is formed of a resin. A metal-shaped outer cylinder, a joint fixed in the cylinder tip, and a needle tip protruding from the cylinder tip to the distal end side, and communicating the inner space of the outer cylinder with the outside An injection needle, and the injection needle is a syringe with an injection needle fixed in the tube tip by insert molding or heat welding, and has an area of at least 1 mm ² on the outer peripheral surface of the joint portion. In addition, an uneven portion having an average surface roughness of at least 0.2 μm is provided, and the resin closely contacts and covers each uneven portion of the uneven portion, whereby the joint portion is securely fixed in the tube tip, An autoclave is attached to the outer cylinder in a state where the injection needle is fixed in the cylinder tip. Are those sterilized by ethylene oxide gas is applied.

  In the syringe with a syringe needle, the concavo-convex part is preferably formed by blasting.

  In the syringe with a syringe needle, a plurality of the concave and convex portions may be formed at equal intervals in the circumferential direction of the syringe needle.

  In the syringe with a syringe needle, it is preferable that the concavo-convex portion is not provided at the proximal end portion of the syringe needle.

  In the syringe with a syringe needle, the length of the joint in the axial direction of the syringe needle is preferably 10 mm at the maximum.

  The syringe with a syringe needle may be detachably attached to the tube tip and may include a cap that seals the needle tip.

  It is preferable that the syringe with an injection needle includes a chemical solution filled in the inner space, and a gasket that is slidably inserted into the body portion in a liquid-tight manner.

The method of manufacturing a syringe with a syringe needle has a cylindrical tip formed at a distal end, a cylindrical tip formed at the distal end, an opening at the proximal end, and a body portion provided with an inner space filled with a chemical solution therebetween, and formed of resin. A metal injection needle having an outer cylinder, a joint portion fixed in the cylinder tip, and a needle tip protruding from the tip of the cylinder tip to communicate the inner space of the outer cylinder with the outside And forming a concavo-convex part having an average surface roughness of at least 0.2 μm in a region having an area of at least 1 mm ² on the outer peripheral surface of the joint part. And when molding the outer cylinder with the resin, the resin is in close contact with the uneven portions of the uneven portions so that the joint portion is securely fixed in the tube tip. Insert molding the injection needle into the outer cylinder, or after molding the outer cylinder with the resin The step of heat-welding the injection needle to the outer cylinder so that the joint is securely fixed in the cylinder tip by covering and covering the uneven parts of the uneven part with the resin, And a step of sterilizing the outer cylinder with an autoclave or ethylene oxide gas.

  In the manufacturing method of the syringe with a syringe needle, it is preferable that the step of forming the uneven portion is a step by blasting.

  In the method for manufacturing a syringe with an injection needle, it is preferable that the blasting process projects a projection material from a plurality of directions at equal intervals in the circumferential direction of the injection needle.

The syringe with an injection needle of the present invention is such that an uneven portion having an average surface roughness of at least 0.2 μm is formed in a region having an area of at least 1 mm ² or more on the outer peripheral surface of the joint portion of the injection needle. is there. Each unevenness of the uneven portion is covered in close contact with the resin of the outer cylinder by the resin of the outer cylinder flowing into the recess. Thereby, the strong anchor effect expresses between an injection needle and an outer cylinder. Due to the anchor effect, the bonding strength between the outer tube and the injection needle is improved. For this reason, even if the stress tightening the injection needle joined to the tube tip is alleviated by sterilization with autoclave or ethylene oxide gas applied to the outer tube, this syringe with a needle is injected by the strong anchor effect exceeding it. The bonding strength between the needle and the outer cylinder does not decrease.

It is sectional drawing which shows one form of the syringe with an injection needle to which this invention is applied. It is a model partial expanded sectional view of the uneven | corrugated | grooved part which the injection needle used for the syringe with an injection needle which applies this invention has. It is a front view which shows another example of the injection needle used for the syringe with an injection needle to which this invention is applied. It is a graph which shows the correlation with the average surface roughness of the unevenness | corrugation formed in the injection needle of the syringe with an injection needle, and the joining strength of an injection needle.

  Hereinafter, although the form for implementing this invention is demonstrated in detail, the scope of the present invention is not limited to these forms.

  A cross-sectional view of one embodiment of the syringe with an injection needle of the present invention is shown in FIG. The syringe with syringe 1 includes a resin outer cylinder 2, a metal injection needle 3 fixed to the cylinder tip 21, a gasket 4 inserted into the inner space 22 of the outer cylinder 2, a cylinder tip 21 and a gasket 4. It is a prefilled syringe which has the chemical | medical solution 5 with which the inner space 22 between them was filled, and the cap 6 which seals the needle tip 3a of the injection needle 3.

  The outer cylinder 2 has a cylinder tip 21 formed at the distal end of the body part 23, an opening 25 at the base end of the body part 23, and a flange 24 formed at the periphery thereof. The tube tip 21 has a smaller diameter than the body portion 23, and the needle tip 3a of the injection needle 3 projects from the tip. The injection needle 3 has a thickness of 34 to 25 G (outside diameter of about 0.18 to 0.53 mm).

  The injection needle 3 penetrates the tube tip 21 and communicates the inside and outside of the outer tube 2. The injection needle 3 is fixed by being directly joined to the outer cylinder 2. A joint portion between the injection needle 3 and the outer cylinder 2 is a joint portion 30. The outer peripheral surface of the joint portion 30 is a joint outer peripheral surface 31 that is in close contact with and covered with the resin molding the outer cylinder 2. The injection needle 3 has a fine concavo-convex portion 32 in a part of a substantially middle portion of the joint outer peripheral surface 31.

In FIG. 2, the model partial expanded sectional view of the uneven | corrugated | grooved part 32 is shown. The concavo-convex portion 32 is formed by a concave portion 32a and a convex portion 32b. The concavo-convex portion 32 is a rough surface formed by blasting, and is formed by surrounding a part of the joint outer peripheral surface 31 within a certain range having a width M. The concave-convex portion 32 causes the anchor effect to appear between the injection needle 3 and the outer cylinder 2 by the resin forming the outer cylinder 2 being in close contact with and covering the concave portions 32 a and the convex portions 32 b. . The joint strength between the injection needle 3 and the outer cylinder 2 is remarkably improved by the anchor effect as compared with the case where the uneven portion 32 is not formed. In particular, the concavo-convex portion 32 is formed in a region having an area of 1 mm ² or more on the outer peripheral surface (joined outer peripheral surface 31) of the joint portion 30 so that the average surface roughness is 0.2 μm or more. It is preferable.

When the outer cylinder 2 is molded by injection molding, the molten resin flows through the cavity of the mold and flows into the concave portion 32 a of the concave and convex portion 32. When the resin is cooled and hardened in this state, the resin is caught by the concave portions 32a and the convex portions 32b, and an anchor effect is exhibited. In particular, when the uneven portion 32 is formed in a region having an area of 1 mm ² or more on the joint outer peripheral surface 31 with an average surface roughness of 0.2 μm or more, the injection needle 3 and the outer cylinder 2 are each As a result of meshing between the recess 32a and each projection 32b, a stronger anchor effect is obtained between them. Even if the sterilization treatment of the syringe 1 with an injection needle by autoclave high-pressure steam sterilization or ethylene oxide gas sterilization progresses in the relaxation of stress that tightens the injection needle 3 under a temperature load, The bonding strength with the outer cylinder 2 is not greatly reduced. For this reason, the injection needle 3 is not pushed into the outer cylinder 2 when the injection needle 3 is punctured into the skin, and the injection needle 3 does not fall out of the outer cylinder 2 when the injection needle 3 is pulled out from the skin.

  The bonding strength between the injection needle 3 and the outer cylinder 2 has a correlation with the average surface roughness of the uneven portion 32. As the average surface roughness of the concavo-convex portion 32 is larger, the difference in height between the concave portion 32a and the convex portion 32b becomes larger. Thereby, an anchor effect becomes large and the joint strength of the injection needle 3 and the outer cylinder 2 improves. Even when the outer cylinder 2 is subjected to autoclave or ethylene oxide gas sterilization treatment, sufficient bonding strength is maintained between the injection needle 3 and the outer cylinder 2 when the cap 6 is removed and when the injection needle 3 is punctured or pulled out. However, the average surface roughness of the uneven portion 32 needs to be at least 0.2 μm. In addition, it is preferable that the average surface roughness of the concavo-convex portion 32 is at most half of the thickness of the injection needle 3. Thereby, when forming the uneven | corrugated | grooved part 32 on the joining outer peripheral surface 31 of the junction part 30, it does not deform | transform on the inner peripheral surface of the injection needle 3. FIG.

Further, the bonding strength between the injection needle 3 and the outer cylinder 2 has a correlation with the area of the bonding outer peripheral surface 31 where the concavo-convex portion 32 is formed. The larger the area of the joint portion 30 where the concavo-convex portion 32 is formed, the greater the number of concave portions 32a and convex portions 32b. As a result, the anchor effect is increased and the bonding strength between the injection needle 3 and the outer cylinder 2 is improved. This joining strength is required to be sufficiently low even if the outer cylinder 2 is sterilized with an autoclave or ethylene oxide gas. For this reason, in order to obtain sufficient bonding strength between the outer cylinder 2 and the injection needle 3, the area of the region where the concavo-convex portion 32 is formed on the bonding outer peripheral surface 31 of the bonding portion 30 is at least 1 mm ² . It needs to be. This region may be the entire outer surface 31 of the joint 30 at the maximum.

For example, when the thickness of the injection needle 3 is 34G (outer diameter is about 0.18 mm), the width M of the uneven portion 32 is at least 1. In order to make the area of the region where the uneven portion 32 is formed 1 mm ² or more. It needs to be 8 mm. When the area of the region where the uneven portion 32 is formed is smaller than 1 mm ² , the anchor effect is insufficient.

  In the case of autoclave sterilization, a temperature load of 121 to 125 ° C. and in the case of ethylene oxide gas sterilization, a temperature load of 40 to 70 ° C. is applied to the syringe 1 with a syringe needle. Even if the resin of the outer cylinder 2 is somewhat softened under such a temperature load and the stress for tightening the injection needle 3 is relaxed, the uneven portion 32 having such a sufficient area and average surface roughness causes the uneven portion 32 to The resin of the outer cylinder 2 remains engaged and caught. Therefore, since the syringe 1 with an injection needle maintains a sufficient bonding strength between the injection needle 3 and the outer cylinder 2 before, during or after sterilization, the injection needle 3 can easily fall out of the outer cylinder 2. Absent.

  Moreover, since the joining outer peripheral surface 31 exhibits a sufficient anchoring effect at the uneven portion 32, in order to obtain sufficient joining strength between the injection needle 3 and the outer cylinder 2 even after sterilization treatment with an autoclave or ethylene oxide gas, It is not necessary to ensure the area of the outer peripheral surface 31 much wider. Therefore, since the length L of the joint portion 30 in the axial direction of the injection needle 3 can be shortened, the length of the tube tip 21 can be shortened accordingly. Specifically, the length L of the joint portion 30 in the axial direction of the injection needle 3 can be set to 10 mm or less. Thus, the syringe 1 with an injection needle can shorten the injection needle 3 and the tube tip 21 by making the injection needle 3 have the concavo-convex portion 32, thereby reducing the size. Thereby, since the amount of raw materials to be used can be reduced and the injection mold can be simplified, it is possible to manufacture at a low cost while suppressing costs. Moreover, the chemical | medical solution which remains in the injection needle 3 and is wasted can be made very small.

  The gasket 4 is an elastic body such as rubber or elastomer, and is in airtight contact with the inner wall of the body 23 and is slidably inserted into the body 23. The gasket 4 has a mounting hole 4a at the base end. A plunger (not shown) is screwed into the mounting hole 4a. The plunger pushes the gasket 4 and slides it toward the tube tip 21. The gasket 4 discharges the drug solution 5 from the needle tip 3a and the injection needle 3 in accordance with this sliding.

  The cap 6 is an elastic body such as rubber or elastomer, and covers the tube tip 21 and the injection needle 3 when the injection needle 3 is inserted straight from the needle tip 3a. The cap 6 protects the injection needle 3 from bending and contamination while preventing the chemical solution 5 contained in the inner space 22 from leaking from the needle tip 3a. Since the injection needle 3 is pierced, the cap 6 tightens the outer peripheral surface on the distal end side of the injection needle 3. When the cap 6 is pulled and removed, the injection needle 3 is pulled together with the cap 6 by this tightening. However, since the unevenness portion 32 is formed and the anchor effect is exhibited, the bonding strength is improved. The tube 2 cannot be removed.

  The chemical solution 5 is contained in the inner space 22 so as to be sandwiched between the tube tip 21 and the gasket 4. The chemical liquid 5 is not contaminated or leaked during transportation or storage of the syringe 1 with a syringe needle by the gasket 4 inserted in the body 23 in a liquid-tight manner and the cap 6 that seals the needle tip 3a. A part of the drug solution 5 may be accommodated in the injection needle 3.

The syringe 1 with an injection needle is manufactured as follows. First, on the joint outer peripheral surface 31 of the injection needle 3, a step of forming the concavo-convex portion 32 by blasting in a region having an area of 1 mm ² or more is performed. According to the blasting process, fine irregularities can be easily formed depending on the projection material and projection conditions. At the time of blasting, the portion of the joint portion 30 of the injection needle 3 where the uneven portion 32 is not formed is protected by masking with a rubber sheet or the like. After the injection needle 3 is inserted into the blasting apparatus, the projection material is projected from the tip of the nozzle for a predetermined time while rotating around the axis of the injection needle 3 to the exposed portion to form the uneven portion 32. The projection material can be selected from metal such as cast iron, aluminum, and zinc, ceramic such as alumina, silicon carbide, and silica, resin such as nylon and polycarbonate, dry ice, and glass beads. The average particle size of the projection material is suitably 20 to 250 μm. Moreover, the injection air pressure for projecting the projection material is 0.1 to 10 MPa, and the projection time is 2 to 30 seconds. For example, in the case of a stainless steel injection needle 3 having a thickness of 27G, by selecting silica alumina having an average particle diameter of 70 μm as a projection material and processing it for 10 seconds with an injection air pressure of about 3.5 MPa, The average surface roughness is about 2 μm.

  Moreover, it is good also considering the average surface roughness of the uneven | corrugated | grooved part 32 as 0.2 micrometer by carrying out blasting using the projection material with a small average particle diameter especially. Since the uneven portion 32 having an average surface roughness of 0.2 μm has a much larger number of uneven portions than that having an average surface roughness of several μm, a sufficient anchor effect can be obtained. Thereby, sufficient joining strength is obtained between the injection needle 3 and the outer cylinder 2.

  Next, a step of joining the injection needle 3 to the outer cylinder 2 by insert molding by injection molding of the outer cylinder 2 is performed. At this time, the outer cylinder 2 is molded using an injection mold of a female mold that takes the outer shape of the outer cylinder 2 and a core pin that is a male mold that forms the inner space 22 of the outer cylinder. First, the injection needle 3 on which the uneven portion 32 is formed is fixed to an injection mold. At this time, the concavo-convex portion 32 remains in the cavity of the female mold for molding the tube tip 21. Further, the injection needle 3 is fixed by inserting the proximal end portion 33 of the injection needle 3 into a holding hole provided at the tip of the core pin. Next, a thermoplastic resin pellet for molding the outer cylinder 2 is put into an injection molding machine and melted at a high temperature. The outer cylinder 2 is molded by injecting the molten resin into the mold cavity at a high pressure. The melted resin covers the concave portions 32a and the convex portions 32b of the concave and convex portions 32 of the injection needle 3 remaining in the cavity in close contact, and is cooled and hardened. Thereby, an anchor effect appears between the injection needle 3 and the outer cylinder 2, and a strong joint strength is obtained. In addition, it is preferable not to form the uneven part 32 by masking the outer peripheral surface of the base end part 33. Thereby, the base end of the injection needle 3 can be reliably held in the holding hole of the core pin of the injection mold.

  The injection needle 3 is pierced straight into the cap 6 that is recessed by the amount of the tube tip 21, and the cap 6 is attached to the tube tip 21. A plurality of these are suspended and stored in an outer cylinder storage container (not shown) that can be stored. A protective film is applied to the opening of the outer cylinder storage container, and the opening is sealed. In a state where the syringe 1 with a syringe needle is housed in the outer cylinder storage container, sterilization is performed using an autoclave or ethylene oxide gas, and the outer cylinder storage container is packed and transported to a factory filled with a chemical solution.

  In the clean room of the factory where the chemical solution is filled, the protective film of the outer cylinder storage container is peeled off, and the outer cylinder storage container is placed at a predetermined position of a drug filling device (not shown). A chemical supply nozzle is inserted into the opening 25 to fill the inner space 22 with a predetermined amount of the chemical 5. Next, the chemical solution 5 is accommodated in the inner space 22 by inserting the gasket 4 from the opening 25. Thus, the syringe 1 with an injection needle which is a prefilled syringe is manufactured.

  The syringe 1 with an injection needle is used as follows. The syringe 1 with an injection needle is taken out from the outer cylinder storage container, stored in a individually sterilized packaging bag, sealed and shipped. The syringe 1 with an injection needle is transported to a hospital or the like and taken out from the packaging bag immediately before the drug solution 5 is administered to the patient. A plunger (not shown) is screwed into the mounting hole 4a of the gasket 4 and the cap 6 is removed. As the injection needle 3 is punctured into the patient's skin and the proximal end of the plunger is pushed, the medicinal solution 5 is pushed out by the gasket 4 and discharged from the syringe with syringe needle 1 to be administered to the patient. In addition, the syringe 1 with an injection needle may be shipped with a plunger attached. Thereafter, the syringe 1 with an injection needle is discarded as an infectious medical waste together with the gasket 4 and the plunger according to a predetermined procedure.

  The syringe 1 with an injection needle has only the outer cylinder 2 and the injection needle 3 in addition to the prefilled syringe described above, and a cap 6 is attached to the prefillable syringe that can be filled with the drug solution 5 or this prefillable syringe. It may be a thing.

  FIG. 1 shows an example in which the concavo-convex portion 32 is formed by blasting. However, in the concavo-convex portion 32, the resin forming the tube tip 21 flows into the concave portion 32 a and each concave portion 32 a and each convex portion 32 b It may be formed so as to be caught. Although the uneven part 32 showed the example of the rough surface formed by the blasting in FIG. 1, for example, the horizontal stripe single eyelid shown in FIG. 3 (a), the vertical stripe single eye shown in (b), for example It is good also as a kite kite shown in FIG. Moreover, the uneven | corrugated | grooved part 32 may be formed in multiple numbers at equal intervals in the circumferential direction of the injection needle 3, as shown to the same figure (f). These can be formed by plastic working that forms the concavo-convex portion 32 in accordance with the transfer by pressing the saddle. In addition, the concavo-convex part 32 can be formed by a grinding process for forming the concave part 32a by grinding, or an etching process for forming the concave part 32a by an etching agent, an ion beam or the like.

  In addition, it is preferable to form the uneven | corrugated | grooved part 32 by blasting among these processes. Blasting can form the concavo-convex portion 32 without damaging the needle tip 3a. In addition, according to the blasting process, since the inner peripheral surface of the injection needle 3 is not deformed when the concave and convex portion 32 is formed, the injection resistance when the drug solution 5 is administered is not increased. Further, since blasting does not use chemicals that may affect the chemical 5, there is no contamination of the chemical 5 with the remaining chemicals.

  FIG. 1 shows an example in which the injection needle 3 is rotated at the time of blasting, but the projection material may be projected from a plurality of directions at equal intervals in the circumferential direction without rotating the injection needle 3. As a result, a plurality of concave and convex portions 32 are formed at equal intervals in the circumferential direction of the injection needle 3 as shown in FIG. Thereby, even when the axial pulling or pushing force of the injection needle 3 acts on the injection needle 3, the stress is not concentrated only on one side in the circumferential direction of the injection needle 3, and the joint portion 30 of the injection needle 3. And the tube tip 21 of the outer cylinder 2 are not broken. Similar to the case where a plurality of concave and convex portions 32 are formed at equal intervals in the circumferential direction of the injection needle 3, the concave and convex portions 32 are formed even when the concave and convex portions 32 are continuously formed in the circumferential direction of the injection needle 3 shown in FIG. 32a and the convex part 32b are formed innumerably in the circumferential direction of the range of the width | variety M in the injection needle 3. FIG.

  Although the uneven | corrugated | grooved part 32 showed the example provided in a part of joining outer peripheral surface 31 of the injection needle 3, it may be formed in the whole joining outer peripheral surface 31. FIG.

  In FIG. 1, as a step of joining the injection needle 3 to the outer cylinder 2, a step of joining by injection molding of the outer cylinder 2 by injection molding is described. However, the injection needle 3 is subjected to a process of heat welding to the outer cylinder 2. It may be joined. The outer cylinder 2 is molded in advance by injection molding or the like. The tube tip 21 is open at the tip, penetrates with a diameter slightly larger than the outer diameter of the injection needle 3, and communicates the inside and outside of the outer tube 2. The injection needle 3 is inserted into the opening of the tube tip 21 from its proximal end to a predetermined position where all of the concavo-convex portions 32 face the inner wall surface of the tube tip 21. Next, the injection needle 3 and the outer cylinder 2 are joined by irradiating the inner wall surface of the cylinder tip 21 facing the outer peripheral surface of the injection needle 3 with laser or high frequency to melt the inner wall surface of the cylinder tip 21. According to this heat welding, since a mold having a structure for fixing the injection needle 3 is not required, the syringe 1 with an injection needle can be manufactured at low cost. In addition, in order to improve the liquid tightness between the tube tip 21 and the injection needle 3, a cylindrical resin bonding member (not shown) may be provided between the tube tip 21 and the injection needle 3. In this case, the injection needle 3 is inserted into the joining member, and it is heat-welded while being pressed into the tube tip 21.

  The material of the outer cylinder 2 is selected from the viewpoints of chemical resistance, heat resistance, gas / bacteria barrier properties, safety to living bodies, transparency, and the like. For example, polyolefin resin such as polyethylene, polypropylene and cyclic polyolefin; polystyrene; polycarbonate; polyester such as polyethylene terephthalate; In particular, it is preferable to use a cyclic olefin homopolymer or a cyclic olefin copolymer, which is a resin that is transparent so that the chemical liquid accommodated therein can be visually confirmed from the outside and has little interaction with the chemical liquid. They are formed by molding. As the molding method, an injection molding method, a blow molding method, a thermoforming method, or the like can be used, and among these, the injection molding method is preferable.

  The material of the injection needle 3 is a material that can be insert-molded or thermally welded, and is selected from the viewpoints of chemical resistance, heat resistance, gas / bacteria barrier properties, safety to the living body, and the like. For example, stainless steel and nickel-free stainless steel can be mentioned, but stainless steel that is relatively easy to form and inexpensive is preferable.

  The material of the cap 6 and the gasket 4 is selected from the viewpoints of chemical resistance, heat resistance, gas / bacteria barrier properties, safety to living bodies, and airtightness. For example, rubber materials such as olefin-based, polyurethane-based, polyester-based, polyamide-based or styrene-based thermoplastic elastomers, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, and silicone rubber are used.

  When the syringe 1 with a syringe needle constitutes a prefilled syringe, the drug solution 5 accommodated in the outer cylinder 2 is, for example, influenza, tetanus, pneumococci, polio, Japanese encephalitis, rubella, measles, yellow fever, hib, hepatitis And biopharmaceuticals such as vaccines against chickenpox, rabies, rotavirus, mumps, cervical cancer prevention, MQ, DT and DPT. Other than vaccines, for example, insulin preparations, sugar solution injection solutions such as glucose, electrolyte correction injection solutions such as sodium chloride and potassium lactate, contrast agents, steroid agents, proteolytic enzyme inhibitors, fat emulsions, antibiotics, anticancer Agents, heparin calcium, anesthetics, antibody drugs and the like.

  Hereinafter, an example in which a syringe with an injection needle to which the present invention is applied is made as an experiment is shown.

(Example)
A stainless steel injection needle (27G) having an outer diameter of 0.41 mm, an inner diameter of 0.28 mm, and a length of 22 mm was used as a sample of an example to which the present invention was applied. The concavo-convex portion 32 was formed by sandblasting the outer peripheral surface of the region from the proximal end of the injection needle 3 to a length of 9 mm in the axial direction of the injection needle 3. Next, the surface roughness of the concavo-convex portion 32 was measured with a surface roughness meter (manufactured by Olympus, product name OLS4000) over 9 mm in the axial direction of the injection needle 3 to determine the average surface roughness Ra. After this injection needle 3 was washed, it was fixed to an injection mold. A syringe with an injection needle in which the injection needle 3 is joined to the outer cylinder 2 and fixed by injecting the pellet of the cyclic polyolefin resin into an injection molding machine, melting at a high temperature, and injecting the high pressure into the cavity of the mold. 1 was produced. Note that the proximal end portion 33 of the injection needle 3 protrudes out of the cavity of the female mold by 1 mm and is held by the core pin, and thus is not included in the joint portion 30. For this reason, the length L in the axial direction of the injection needle 3 is 8 mm, which is shorter than the axial width M in which the concavo-convex portion 32 is formed, for the joint portion 30 where the injection needle 3 joins the outer cylinder 2. . That is, the area of the joint outer peripheral surface 31 on which the uneven portion 32 is formed was 10.3 mm ² .

(Comparative example)
As a comparative example to which the present invention is not applied, an injection needle not subjected to sandblasting was prepared. The only difference from the example is that sandblasting is not performed. The other points were the same as in the example, and after measuring the surface roughness and determining the average surface roughness, a syringe with a syringe needle was produced by injection molding.

(Tensile test)
About the sample of an Example and a comparative example, the tension test was done using the tensile testing machine (The Shimadzu Corporation make, product name AGS-H). The syringe with a syringe needle was fixed to a tensile tester so that the flange of the outer cylinder was on the lower side and the needle tip was on the upper side, and the tip side of the syringe needle was gripped with an air chuck. The needle was pulled at a pulling speed of 50 mm / min until the needle was pulled out, and the maximum resistance value at this time was determined as the bonding strength. FIG. 4 shows a graph in which the horizontal axis represents the average surface roughness Ra (μm) and the vertical axis represents the bonding strength (N). As for the bonding strength of the sample of the example, the sample with Ra = about 1 μm showed about 110 N, and the sample with Ra = 1.5-2.0 μm showed about 120-150 N. On the other hand, the bonding strength of the sample of Ra = 0 μm as a comparative example was about 40N. The bonding strength of the syringe 1 with an injection needle of the example in which the concavo-convex part 32 was formed by performing sandblasting was higher than that of the comparative example in which this was not performed.

(Autoclave sterilization)
About the sample of an Example and a comparative example, the autoclave sterilization process was performed on the conditions of temperature 121 degreeC and time 20 minutes. Thereafter, the above tensile test was performed, and the sample of the example and the sample of the comparative example were compared. The results are shown in Table 1. In Table 1, the evaluation was made in three stages, with a bonding strength of 80N or higher being ◯, a bonding strength of 40-80N being Δ, and a bonding strength of 40N or lower being X.

  As can be seen from Table 1, the syringe with an injection needle of the example having an uneven surface with an average surface roughness of 0.2 μm or more on the injection needle maintains a high bonding strength before and after the autoclave sterilization treatment. On the other hand, the bonding strength of the syringe with the injection needle of the comparative example having no concavo-convex portion was not sufficient even before the autoclave sterilization treatment, and significantly decreased after the treatment. Thus, the difference between the example and the comparative example was remarkable.

  The syringe with an injection needle of the present invention is used as a prefilled syringe in which a chemical solution is previously stored in an outer cylinder after sterilization with an autoclave or ethylene oxide gas, and a syringe for inhaling an injection solution at the time of use. Used for drug solution administration by injection.

1: Syringe with injection needle 2: Outer cylinder 3: Injection needle 3a: Needle tip 4: Gasket 4a: Mounting hole 5: Chemical solution 6: Cap 21: Tube tip 22: Inner space 23: Body 24: Flange 25: Opening 30: Joint 31: Joint outer peripheral surface 32: Concavity and convexity 32a: Concave portion 32b: Convex portion 33: Base end portion L: Length M: Width

A syringe with a syringe needle to which the present invention is applied has a cylinder tip at a distal end, an opening at a proximal end, and a body portion provided with an inner space filled with a chemical solution therebetween, and is formed of a resin. Shaped outer cylinder,
A metal part that has a joint portion fixed in the tube tip and a tip projecting portion that includes a needle tip at the tip and protrudes toward the tip side from the tube tip , and communicates the inner space of the outer tube with the outside. Needle and
The syringe needle is a syringe with a syringe needle fixed in the tube tip by insert molding or heat welding,
The tube tip communicates with the inner space of the barrel portion at the base end of the fixing portion, which covers the outer peripheral surface of the joint portion of the injection needle, and with a smaller diameter than the inner space. A base end portion defining a space,
On the outer peripheral surface of the joint , an uneven portion having a plurality of concave portions and a plurality of convex portions is provided in a region having an area of at least 1 mm ² , and the resin includes the plurality of concave portions and the plurality of concave portions. by covering in close contact with each of the projections are securely fixed to the joint in said fixed portion of said cylindrical tip,
The injection needle is provided with a proximal end protruding portion at the proximal end that is exposed in the communication space and has an outer peripheral surface on which the uneven portion is not formed .

In the syringe with a syringe needle, it is preferable that the concavo-convex portion is not provided at the proximal end portion of the syringe needle.
In the syringe with a syringe needle, for example, the tip protruding portion of the syringe needle does not have the uneven portion.
In the syringe with an injection needle, for example, the injection needle is fixed in the fixing portion of the tube tip by insert molding, and the proximal end protruding portion of the injection needle clears the inner space of the outer cylinder at the time of insert molding. This is a holding trace portion that is inserted and held in a holding hole provided at the tip of the core pin to be formed.

The method of manufacturing a syringe with a syringe needle has a cylindrical tip formed at a distal end, a cylindrical tip formed at the distal end, an opening at the proximal end, and a body portion provided with an inner space filled with a chemical solution therebetween, and formed of resin. An outer cylinder,
A metal part that has a joint portion fixed in the tube tip and a tip projecting portion that includes a needle tip at the tip and protrudes toward the tip side from the tube tip , and communicates the inner space of the outer tube with the outside. Needle and
Equipped with a,
The tube tip covers the outer peripheral surface of the joint portion of the injection needle to fix the joint portion in the tube tip, and the base end of the fixed portion communicates with the inner space of the trunk portion. And a base end portion defining a communication space having a diameter smaller than that of the inner space,
The injection needle is a method for producing a syringe with a syringe needle having a proximal end and a proximal end protruding portion whose outer peripheral surface is exposed in the communication space of the tube tip ,
Forming an uneven portion having a plurality of concave portions and a plurality of convex portions in a region having an area of at least 1 mm ² on an outer peripheral surface of a portion to be the joint portion of the injection needle ;
When molding the outer cylinder with the resin, the resin is in close contact with each uneven portion of the uneven portion so that the joint is securely fixed in the tube tip. After the insert molding step for insert molding to the outer cylinder or after molding the outer cylinder with the resin, the resin is in close contact with and covers each of the plurality of concave portions and the plurality of convex portions of the concave and convex portions , as the joint is reliably secured within the cylindrical tip has a thermal welding step of heat-welded to the outer cylinder of the injection needle,
In the step of forming the concavo-convex portion, the concavo-convex portion is formed on the outer peripheral surface of the portion to be the joining portion so as not to have the concavo-convex portion in the portion to be the base end protruding portion of the injection needle. It is.

The manufacturing method of the syringe with a syringe needle includes the step of forming the concavo-convex portion by blasting in a state in which the portion that becomes the base end protruding portion of the injection needle is masked, so that the outer periphery of the portion that becomes the joint portion It is preferable to form the uneven portion on the surface .

In the method for manufacturing a syringe with an injection needle, it is preferable that the blasting process projects a projection material from a plurality of directions at equal intervals in the circumferential direction of the injection needle.
In the method for producing a syringe with a syringe needle, for example, the syringe needle is fixed in the fixed portion by the insert molding step,
In the insert molding step,
Before molding the outer cylinder with the resin, the concave and convex portions of the injection needle are disposed in the cavity of the female mold that forms the cylinder tip, and the male mold that forms the inner space of the outer cylinder The injection needle is fixed in an injection mold by inserting the proximal end protruding portion of the injection needle into a holding hole provided at the distal end of the core pin.
Injecting molten resin into the cavity, the resin in close contact with each of the plurality of concave portions and the plurality of convex portions of the concave-convex portion of the injection needle disposed in the cavity, The outer cylinder is formed of the resin by cooling and curing the resin.

Claims (10)

A cylindrical outer cylinder formed of a resin having a cylinder tip at the distal end, an opening at the proximal end, and a body portion provided with an inner space filled with a chemical solution therebetween,
A metal injection needle having a joint fixed in the tube tip and a needle tip protruding from the tube tip to the tip side, and communicating the inner space of the outer tube with the outside;
The syringe needle is a syringe with a syringe needle fixed in the tube tip by insert molding or heat welding,
On the outer peripheral surface of the joint portion, an uneven portion having an average surface roughness of at least 0.2 μm is provided in a region having an area of at least 1 mm ² , and the resin covers the uneven portions of the uneven portion in close contact with each other. Thus, the joint is securely fixed in the tube tip,
A syringe with an injection needle, wherein the outer cylinder in a state where the injection needle is fixed in the cylinder tip is sterilized with an autoclave or ethylene oxide gas.   The syringe with a syringe needle according to claim 1, wherein the uneven portion is formed by blasting.   The syringe with syringe needle according to claim 1, wherein a plurality of the uneven portions are formed at equal intervals in the circumferential direction of the injection needle.   The syringe with an injection needle according to claim 1, wherein the uneven portion is not provided at a base end portion of the injection needle.   The syringe-attached syringe according to claim 1, wherein the length of the joint portion in the axial direction of the injection needle is 10 mm at the maximum.   The syringe with a syringe needle according to claim 1, further comprising a cap that is detachably attached to the tube tip and seals the needle tip.   The syringe with a syringe needle according to claim 6, further comprising: a drug solution filled in the inner space; and a gasket that is slidably inserted into the body portion in a liquid-tight manner. A cylindrical outer cylinder formed of a resin having a cylinder tip at the distal end, an opening at the proximal end, and a body portion provided with an inner space filled with a chemical solution therebetween,
A metal injection needle having a joint fixed in the tube tip and a needle tip protruding from the tube tip to the tip side, and communicating the inner space of the outer tube with the outside;
A method of manufacturing a syringe with a needle comprising:
Forming an uneven portion having an average surface roughness of at least 0.2 μm in a region having an area of at least 1 mm ² on the outer peripheral surface of the joint portion;
When molding the outer cylinder with the resin, the resin is in close contact with each uneven portion of the uneven portion so that the joint is securely fixed in the tube tip. After the step of insert molding the outer cylinder or molding the outer cylinder with the resin, the joint is securely fixed in the cylinder tip by covering the resin with the concave and convex portions of the concave and convex portions. A step of thermally welding the injection needle to the outer cylinder;
A step of sterilizing the outer cylinder with an autoclave or ethylene oxide gas;
The manufacturing method of the syringe with a syringe needle characterized by having.   The method for producing a syringe with a syringe needle according to claim 8, wherein the step of forming the concavo-convex portion is a step by blasting.   The method for producing a syringe with an injection needle according to claim 9, wherein the blasting is to project the projection material from a plurality of directions at equal intervals in a circumferential direction of the injection needle.

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