Medical needle and method of manufacturing the same

Abstract

Provided is a medical needle and a manufacturing method thereof, which can easily and accurately confirm the arrangement state of an adhesive that joins a needle body and a needle hub. The medical needle (10) includes a needle hub (16) provided with a through-hole (22) into which a needle body (12) is inserted, and an adhesive (18) present in a gap (38) between an outer peripheral surface (12c) of the needle body (12) and an inner peripheral surface (22a) of the through-hole (22). The gap (38) has a deceleration portion (46) and a first abutment portion (44) and a second abutment portion (48) that abut the deceleration portion (46) on both sides in the extension direction of the through-hole (22). The cross-sectional area of the deceleration portion (46) orthogonal to the extension direction is larger than those of the first abutment portion (44) and the second abutment portion (48). A set position (58) is provided at the boundary between the deceleration portion (46) and the second abutment portion (48). The adhesive (18) is filled between at least the injection opening (34) and the set position (58) of the gap (38).

Description

Technical Field

[0001] This invention relates to a medical needle having a needle body and a needle hub joined by an adhesive, and a method for manufacturing the same. Background Technology

[0002] For example, as disclosed in Patent Document 1, a medical needle is known to include a needle body for insertion into the body and a needle hub connected to the needle body and usable by a user. A through hole is formed on the needle hub along the extending direction of the needle body, and the base end of the needle body is inserted into the through hole. That is, the needle body protrudes from an opening at one end of the through hole along its extending direction to the outside of the through hole. Furthermore, an adhesive for bonding the needle body and the needle hub is present in the gap between the inner circumferential surface of the through hole and the outer circumferential surface of the needle body.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-169896 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In manufacturing such a medical needle, for example, the needle body is first inserted into a through-hole to form the aforementioned gap. An adhesive is supplied to this gap through the opening in the through-hole (hereinafter also referred to as the injection opening). In this gap, the surface tension of the outer peripheral surface of the needle body in contact with the adhesive and the inner peripheral surface of the through-hole (hereinafter also referred to as the wall surface) is greater than the surface tension of the adhesive. Therefore, the adhesive supplied to the injection opening wets the wall surface and flows into the gap towards the other end in the extending direction. By curing the adhesive supplied to the gap in this manner, the needle body and the needle hub are joined, thus obtaining a medical needle.

[0008] However, from the viewpoint of ensuring the quality of the manufactured medical needles, it is preferable to check the arrangement of the adhesive relative to the aforementioned gap. That is, it is preferable to confirm that a predetermined amount of adhesive, sufficient to bond the needle body and the needle hub with adequate strength, has been filled into the aforementioned gap. Therefore, for example, it is advisable to use a camera or the like to photograph the medical needle and perform image processing to confirm whether the downstream end of the adhesive arranged in the aforementioned gap has reached the predetermined position.

[0009] However, in the aforementioned gap, the distance between the outer circumferential surface of the needle and the inner circumferential surface of the through hole (hereinafter also referred to as the wall distance) is uneven in the circumferential direction of both the through hole and the needle. In this gap, the smaller the wall distance, the greater the surface tension of the wall relative to the adhesive. Therefore, if the adhesive flow velocity is uneven in the circumferential direction of the through hole due to uneven wall distance, the downstream end of the adhesive may be located at different positions in the circumferential direction of the through hole.

[0010] In such medical needles, there is a possibility that even if the downstream end of the adhesive reaches the designated position in a portion of the circumference of the through hole, the downstream end of the adhesive may still not reach the designated position in other portions of the circumference of the through hole. Therefore, in order to check the adhesive's configuration with high precision, it is necessary to confirm the medical needle along the entire circumference of the through hole, which is quite cumbersome.

[0011] Therefore, the object of the present invention is to provide a medical needle and a method thereof that can easily and accurately confirm the configuration of the adhesive that joins the needle body and the needle hub.

[0012] Methods for solving problems

[0013] A medical needle according to one aspect of the present invention includes: a needle body; a needle hub having a through hole for insertion of the needle body; and an adhesive present in a gap between the outer peripheral surface of the needle body and the inner peripheral surface of the through hole, for joining the needle body to the needle hub. The medical needle is characterized in that the needle body protrudes outward from the through hole via an injection opening located at one end in the extending direction of the through hole. The gap has: a deceleration portion disposed at the other end in the extending direction compared to the injection opening; a first abutment portion abutting the deceleration portion at the one end in the extending direction compared to the deceleration portion; and a second abutment portion abutting the deceleration portion at the other end in the extending direction compared to the deceleration portion. In the deceleration portion, a cross-sectional area orthogonal to the extending direction is larger than both the first and second abutment portions. A setting position is provided at the boundary between the deceleration portion and the second abutment portion. The adhesive is filled between at least the injection opening and the setting position in the gap.

[0014] Another aspect of the present invention discloses a method for manufacturing a medical needle by bonding a needle body and a needle hub with an adhesive. The method is characterized by comprising the following steps: a needle body insertion step, in which the needle body is inserted into a through hole provided in the needle hub, and the needle body protrudes outward from an injection opening located at one end of the through hole in its extending direction; and an adhesive supply step, in which the adhesive is supplied from the injection opening into a gap between the outer peripheral surface of the needle body and the inner peripheral surface of the through hole, the gap including a deceleration section that is adjacent to the injection opening. An opening is disposed at the other end of the extending direction; a first adjacent portion is adjacent to the deceleration portion at one end of the extending direction compared to the deceleration portion; and a second adjacent portion is adjacent to the deceleration portion at the other end of the extending direction compared to the deceleration portion, wherein the cross-sectional area orthogonal to the extending direction of the deceleration portion is larger than that of the first adjacent portion and the second adjacent portion respectively, a set position is provided at the boundary between the deceleration portion and the second adjacent portion, and in the adhesive supply process, the adhesive is filled from the injection opening into the gap until at least the set position is reached.

[0015] Invention Effects

[0016] In this medical needle, a deceleration section is provided in the gap between the outer peripheral surface of the needle body and the inner peripheral surface of the through hole of the needle hub. The cross-sectional area of ​​the deceleration section orthogonal to the extending direction is larger than that of the first and second adjacent portions adjacent to the deceleration section in the extending direction of the through hole. Therefore, in terms of the surface tension of the outer peripheral surface of the needle body and the inner peripheral surface of the through hole (hereinafter also referred to as the wall surface) that are in contact with the adhesive when the adhesive is supplied to the gap, the surface tension at the deceleration section is less than that at the first and second adjacent portions. That is, the flow rate of the adhesive flowing from the injection opening to the other end in the extending direction is slower at the deceleration section than at the first and second adjacent portions.

[0017] For example, in the gap between the injection opening and the first adjacent portion, if the flow rate of a portion of the adhesive in the circumferential direction of the through hole increases while the flow rate of the remaining adhesive decreases, a portion of the adhesive with the faster flow rate flows into the deceleration portion first. At the deceleration portion, as described above, because the flow rate decreases, the remaining adhesive with the slower flow rate also reaches the deceleration portion while the adhesive that flowed into the deceleration portion first is flowing there.

[0018] Therefore, by filling the gap with adhesive from the injection opening to at least a predetermined position located at the boundary between the deceleration section and the second adjacent section, the position of the downstream end of the adhesive (the other end in the extending direction) can be aligned circumferentially within the through hole. Thus, the adhesive's configuration can be easily and accurately confirmed without inspecting the medical needle throughout the entire circumference of the through hole. Attached Figure Description

[0019] Figure 1 This is a perspective view of a medical needle according to an embodiment of the present invention.

[0020] Figure 2 yes Figure 1 A longitudinal sectional view of a medical needle.

[0021] Figure 3 This is a longitudinal sectional view of the needle body and needle hub during the needle insertion process of the manufacturing method of a medical needle according to an embodiment of the present invention.

[0022] Figure 4 This is a longitudinal sectional view of the needle body and needle hub in the adhesive supply process of the manufacturing method of the medical needle according to an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures

[0024] 10…Medical needles 12…Needle body

[0025] 12c…outer circumference 16…needle hub

[0026] 18…Adhesive 22…Through Hole

[0027] 22a…Inner circumferential surface 34…Injection opening

[0028] 38…gap 40…inlet section

[0029] 42…Transfer section 44…First adjacent section

[0030] 46…Deceleration section 48…Second adjacent section

[0031] 54…First conical section 56…Second conical section

[0032] 58…Setting the location Detailed Implementation

[0033] The preferred embodiments of the medical needle and its manufacturing method according to the present invention will be described in detail with reference to the accompanying drawings. Hereinafter, Figure 1 The medical needle 10 shown in this embodiment is an example of a blood collection needle used to collect blood from a living organism (vein). However, the medical needle 10 is not limited to a blood collection needle; for example, it could also be a device used for injecting intravenous fluids into the body.

[0034] like Figure 1 and Figure 2 As shown, the medical needle 10 includes: a hollow needle body 12 having a sharp needle tip 12a; a protective sleeve 14 (cover) covering the needle tip 12a side of the needle body 12 (arrow X1 side); a needle hub 16 disposed at the base end side of the needle body 12 (arrow X2 side); an adhesive 18 for joining the needle body 12 and the needle hub 16; and a tube 20 capable of connecting to the base end side of the needle hub 16.

[0035] The needle body 12 can be formed from metal materials such as stainless steel, aluminum or aluminum alloy, titanium or titanium alloy, or hard resin materials such as polyphenylene sulfide. The needle body 12 is a cylindrical component with an inner hole that serves as a blood flow path. Openings that function as blood inlets and outlets are formed on the needle tip 12a side and the base side of the needle body 12, respectively.

[0036] The protective sleeve 14 is a hollow component capable of housing the needle body 12. Furthermore, the protective sleeve 14 can be fitted with the front end side (arrow X1 side) of the needle hub 16, covering the needle tip 12a side of the needle body 12 protruding from the needle hub 16. For example, the protective sleeve 14 is installed on the needle hub 16 before the use of the medical needle 10 to prevent the needle body 12 from being exposed. Alternatively, when using the medical needle 10, the protective sleeve 14 can be removed from the needle hub 16 by pulling it forward relative to the needle hub 16 (arrow X1 direction), thereby exposing the needle body 12.

[0037] The needle hub 16 is, for example, a resin molded article integrally formed by injection molding. As the resin material constituting the needle hub 16, a material with low heat shrinkage is preferred. Examples of such materials include polycarbonate, rigid polyvinyl chloride, MSB resin, polymethyl methacrylate, polyphenylene sulfide, polyacetal, polystyrene, polypropylene, polyester, polyamide, etc.

[0038] As described later, the needle hub 16 has through holes 22 with different inner diameters depending on their position in the extension direction. Although not shown, when manufacturing such a needle hub 16, for example, an injection-molded body is formed with a core pin whose shape corresponds to the through hole 22 inserted, and the needle hub 16 is formed by pulling the core pin out of the injection-molded body. Therefore, the resin material constituting the needle hub 16 is preferably a material with an elasticity that allows the core pin to be pulled out while the injection-molded body is elastically deformed.

[0039] Regarding the needle hub 16, its appearance when viewed from its outer surface will be described first. The needle hub 16 has, sequentially from the front end (arrow X1 side) to the base end (arrow X2 side), a small-diameter portion 24, a large-diameter portion 26, a flange portion 28, and a gripping portion 30. The needle tip 12a of the needle body 12 protrudes from the front end of the small-diameter portion 24. The large-diameter portion 26 is configured to be fitted into the protective sleeve 14. The base end face of the protective sleeve 14, which fits into the large-diameter portion 26, abuts against the flange portion 28.

[0040] The grip portion 30 is generally cuboid in shape, with gripping surfaces 30a on a set of opposing sides. The gripping surfaces 30a are, for example, shaped to allow a user to easily grip the needle hub 16 with their fingers. Additionally, a set of circumferentially adjacent gripping surfaces 30a on the grip portion 30 are provided with thinned portions 30b that are recessed inwards towards the grip portion 30. It should be noted that the shape of the grip portion 30 is not limited to the generally cuboid shape described above; it can also be, for example, cylindrical or flattened cylindrical. The user can grip the gripping surfaces 30a of the grip portion 30 to perform operations such as attaching and detaching the protective sleeve 14 and puncturing the needle 12 into the skin.

[0041] Next, the internal structure of the needle hub 16 will be described. For example... Figure 2 As shown, the needle hub 16 is provided with a through hole 22 for inserting the base end side of the needle body 12 and a tube insertion hole 32 for inserting the tube 20. The through hole 22 extends through the needle hub 16 along the extension direction of the needle body 12 (arrow X direction). The needle tip 12a side of the needle body 12 protrudes outward from the through hole 22 through an injection opening 34 provided on the front end side (arrow X1 side, one end side of the extension direction) of the through hole 22. In addition, the base end 12b of the needle body 12 protrudes outward from the through hole 22 through a base end side opening 36 provided on the base end side (arrow X2 side, the other end side of the extension direction) of the through hole 22. That is, in this embodiment, the needle body 12 is inserted into the through hole 22 along the entire extension direction of the through hole 22. It should be noted that the base end 12b of the needle body 12 may also be disposed inside the through hole 22 without protruding from the base end side opening 36.

[0042] like Figures 2-4 As shown, a space of such size is provided between the outer peripheral surface 12c of the needle body 12 inserted into the through hole 22 and the inner peripheral surface 22a of the through hole 22, allowing the adhesive 18 ( Figure 2 , Figure 4A gap 38 exists. The gap 38 has an inlet portion 40, a transfer portion 42, a first adjacent portion 44, a deceleration portion 46, and a second adjacent portion 48. The inlet portion 40, transfer portion 42, first adjacent portion 44, deceleration portion 46, and second adjacent portion 48 are arranged sequentially from the front end side to the base end side in the extending direction of the through hole 22. Furthermore, in this embodiment, the outer diameter of the needle body 12 is constant in the extending direction. Therefore, the cross-sectional area of ​​the gap 38 orthogonal to the extending direction (hereinafter also simply referred to as the cross-sectional area) is set corresponding to the inner diameter of the through hole 22.

[0043] The inlet portion 40 extends from the injection opening 34 toward the base end side. The inner diameter of the through hole 22 at the inlet portion 40 is the same as the inner diameter of the injection opening 34. The cross-sectional area of ​​the gap 38 (the inner diameter of the through hole 22) is largest at the inlet portion 40. The intermediate portion 42 is continuous with the base end side of the inlet portion 40 via the inlet tapered portion 50. The cross-sectional area of ​​the intermediate portion 42 is smaller than the cross-sectional area of ​​the inlet portion 40. Therefore, the inner circumferential surface 22a of the through hole 22 at the inlet tapered portion 50 tilts toward the direction that reduces the inner diameter of the through hole 22 as it extends from the inlet portion 40 toward the base end side in the extending direction.

[0044] The first adjacent portion 44 is continuous with the base end side of the transfer portion 42 via the relay tapered portion 52. The cross-sectional area of ​​the first adjacent portion 44 is smaller than the cross-sectional area of ​​the transfer portion 42. Therefore, the inner peripheral surface 22a of the through hole 22 at the relay tapered portion 52 is inclined in the direction that reduces the inner diameter of the through hole 22 as it extends from the base end side of the transfer portion 42 toward the extension direction.

[0045] Furthermore, the first adjacent portion 44 is adjacent to the deceleration portion 46 at its front end side (arrow X1 side) compared to the deceleration portion 46. The second adjacent portion 48 is adjacent to the deceleration portion 46 at its base end side (arrow X2 side) compared to the deceleration portion 46. The deceleration portion 46 includes: a first tapered portion 54, which is formed by expanding the inner diameter of the through hole 22 as it approaches the base end side from the first adjacent portion 44; and a second tapered portion 56, which is formed by reducing the inner diameter of the through hole 22 as it approaches the second adjacent portion 48 from the first tapered portion 54. That is, in the deceleration portion 46, the cross-sectional area becomes larger than the cross-sectional areas of both the first adjacent portion 44 and the second adjacent portion 48. It should be noted that in this embodiment, the gap 38 has only one combination consisting of the first adjacent portion 44, the deceleration portion 46, and the second adjacent portion 48. However, the gap 38 may also have more than one such combination. That is, there is no particular limitation on the number of the above combinations that the gap 38 can have.

[0046] In this embodiment, the cross-sectional area of ​​the first adjacent portion 44 is the same as the cross-sectional area of ​​the second adjacent portion 48, and the cone angle of the first tapered portion 54 is the same as the cone angle of the second tapered portion 56. However, this is not particularly limiting; the cross-sectional areas of the first adjacent portion 44 and the second adjacent portion 48 may also be different from each other. Furthermore, the cone angles of the first tapered portion 54 and the second tapered portion 56 may also be different from each other.

[0047] A setting position 58 is provided at the boundary between the deceleration portion 46 and the second adjacent portion 48 in the extending direction. The setting position 58 is preset such that, when the adhesive 18 is filled from the injection opening 34 into the gap 38 until the setting position 58 is reached, the amount of adhesive 18 in the gap 38 is sufficient to bond the needle body 12 and the needle hub 16 with sufficient strength. Figure 2 As shown, the base end side of the second adjacent portion 48 is continuous with the base end side opening 36 of the through hole 22. The inner diameter of the through hole 22 at the second adjacent portion 48 is the same as the inner diameter of the base end side opening 36.

[0048] The tube insertion hole 32 is provided between the outer wall portion 62 and the inner cylindrical portion 60 provided on the base end side of the needle hub 16. The inner cylindrical portion 60 is cylindrical and has a through hole 22 formed on its inner side. The base end side opening 36 of the through hole 22 is provided at the end of the inner cylindrical portion 60 on the base end side (arrow X2 side).

[0049] The outer peripheral surface of the inner cylindrical portion 60 faces the inner peripheral surface of the outer wall portion 62 through the tube insertion hole 32. That is, the tube insertion hole 32 is annular around the outer periphery of the through hole 22 on the base end side. The base end face 60a of the inner cylindrical portion 60 is disposed on the front end side (arrow X1 side) compared to the base end face 62a of the outer wall portion 62.

[0050] The outer diameter of the inner cylindrical portion 60 is the same as or slightly larger than the inner diameter of the tube 20. Therefore, when the tube 20 is inserted into the tube insertion hole 32, the tube 20 is embedded in the inner cylindrical portion 60. Thus, the tube 20 is fixed to the needle hub 16, and the interior of the needle body 12 protruding from the base end side opening 36 of the through hole 22 communicates with the interior of the tube 20.

[0051] The adhesive 18 is filled from the injection opening 34 into the gap 38 until it reaches the set position 58, thus joining the needle body 12 to the needle hub 16. In this embodiment, a portion of the adhesive 18 protrudes from the injection opening 34 in the same direction as the protrusion of the needle body 12. As the adhesive 18, for example, a UV-curable adhesive (UV-curable resin) and an epoxy adhesive can be used.

[0052] The medical needle 10 of this embodiment is basically constructed as described above. The manufacturing method of the medical needle 10 of this embodiment will be described below. In this manufacturing method, a needle insertion process is first performed. In the needle insertion process, the needle body 12 is inserted into the through hole 22 provided in the needle hub 16, and the needle tip 12a side of the needle body 12 protrudes from the injection opening 34 outward from the through hole 22. Thus, as... Figure 3 As shown, a gap 38 is formed between the inner peripheral surface 22a of the through hole 22 and the outer peripheral surface 12c of the needle body 12.

[0053] Next, as Figure 4 As shown, an adhesive supply process is performed where adhesive 18 is supplied from injection opening 34 to gap 38. In gap 38, the surface tension of the outer peripheral surface 12c of the needle 12 in contact with the adhesive 18 and the inner peripheral surface 22a of the through hole 22 (hereinafter also referred to as the wall surface) is greater than the surface tension of the adhesive 18. Therefore, the adhesive 18 supplied from injection opening 34 wets the wall surface and flows into gap 38 towards the base end side (arrow X2 side) in the extension direction. In this gap 38, the shorter the distance (hereinafter also referred to as the wall distance) between the outer peripheral surface 12c of the needle 12 and the inner peripheral surface 22a of the through hole 22, in other words, the smaller the cross-sectional area of ​​gap 38, the greater the surface tension of the wall surface tends to be relative to the surface tension of the adhesive 18. That is, in the portion of gap 38 with a smaller cross-sectional area, the flow rate of the adhesive 18 is faster.

[0054] Therefore, in this embodiment, the adhesive 18 supplied from the injection opening 34 to the gap 38 flows through the inlet 40 and then into the transfer section 42 via the inlet cone 50. Since the cross-sectional area of ​​the transfer section 42 is smaller than that of the inlet 40, the flow rate of the adhesive 18 in the transfer section 42 is faster than that in the inlet 40. The adhesive 18 flowing in the transfer section 42 flows into the first adjacent section 44 via the relay cone 52. At the first adjacent section 44, since the cross-sectional area is smaller than that of the transfer section 42, the flow rate of the adhesive 18 is faster than that in the transfer section 42. The adhesive 18 flowing in the first adjacent section 44 flows into the deceleration section 46.

[0055] The cross-sectional area of ​​the deceleration section 46 is larger than the cross-sectional areas of the first adjacent section 44 and the second adjacent section 48. Therefore, the adhesive 18 flows in the deceleration section 46 and fills the deceleration section 46 at a slower flow rate than that flowing in the first adjacent section 44. In the adhesive supply process, the adhesive 18 is supplied to the gap 38 until the downstream end of the adhesive 18 (the end on the side of arrow X2) reaches the set position 58 provided at the boundary between the deceleration section 46 and the second adjacent section 48. It should be noted that in the adhesive supply process, the flow of the adhesive 18 can also be promoted by drawing the adhesive 18 into the gap 38 through the base end opening 36 of the through hole 22.

[0056] Next, an adhesive curing process is performed. In the adhesive curing process, the adhesive 18 supplied to the gap 38 as described above is cured by irradiating it with, for example, ultraviolet light. As a result, a medical needle 10 in which the needle hub 16 and the needle body 12 are joined by the adhesive 18 can be manufactured.

[0057] As described above, in this medical needle 10, a deceleration section 46 is provided in the gap 38 between the outer peripheral surface 12c of the needle body 12 and the inner peripheral surface 22a of the through hole 22 of the needle hub 16. The cross-sectional area of ​​the deceleration section 46, orthogonal to the extending direction, is larger than the cross-sectional areas of the first adjacent portion 44 and the second adjacent portion 48 adjacent to the deceleration section 46 in the extending direction of the through hole 22 (the flow direction of the adhesive 18). Therefore, when the adhesive 18 is supplied to the gap 38, the surface tension of the wall surface in contact with the adhesive 18 is less at the deceleration section 46 than at the first adjacent portion 44 and the second adjacent portion 48. In other words, the flow rate of the adhesive 18 flowing from the injection opening 34 into the base end side (arrow X2 side) in the extending direction is slower at the deceleration section 46 than at the first adjacent portion 44 and the second adjacent portion 48.

[0058] Here, for example, due to the offset of the axis of the needle 12 inserted in the through hole 22 relative to the axis of the through hole 22, the wall distance is uneven in the circumferential direction of the through hole 22. In this case, between the injection opening 34 and the first adjacent portion 44 in the gap 38, a portion of the adhesive 18 flows faster in the circumferential direction of the through hole 22, while the flow rate of the remaining adhesive 18 is slower. That is, a portion of the adhesive 18 with a faster flow rate flows into the deceleration portion 46 first.

[0059] Even in this case, at the deceleration section 46, due to the slower flow rate as described above, the remaining adhesive 18 with a slower flow rate also reaches the deceleration section 46 during the period during which a portion of the adhesive 18 that first flows into the deceleration section 46 flows in the deceleration section 46. Therefore, by filling the gap 38 with adhesive 18 from the injection opening 34 until at least the set position 58, it is possible to align the position of the downstream end of the adhesive 18 in the circumferential direction of the through hole 22.

[0060] Therefore, in the medical needle 10, the configuration of the adhesive 18 relative to the gap 38 can be easily inspected. That is, for example, when the adhesive 18 is filled into the gap 38 from the injection opening 34 to the set position 58, the amount of adhesive 18 in the gap 38 is preset to be able to bond the needle body 12 and the needle hub 16 with sufficient strength. Furthermore, the medical needle 10 is photographed from one direction using a camera (not shown) or the like, and the image is processed.

[0061] Therefore, if the downstream end of the adhesive 18 disposed in the gap 38 reaches the set position 58, it can be determined that the downstream end of the adhesive 18 has reached the set position 58 in the entire circumference of the through hole 22. Furthermore, it can be determined that the gap 38 is filled with a predetermined amount of adhesive 18 sufficient to bond the needle body 12 and the needle hub 16 with sufficient strength. In other words, the placement of the adhesive 18 can be easily and accurately confirmed without photographing the medical needle 10 in the entire circumference of the through hole 22.

[0062] In the deceleration section 46 of the medical needle 10 described above, since the inner diameter of the through hole 22 is larger than the inner diameter of the through holes 22 at each of the first adjacent section 44 and the second adjacent section 48, the cross-sectional area is large. The deceleration section 46 has a first tapered section 54 formed by expanding the inner diameter of the through hole 22 at the other end side extending from the first adjacent section 44 in the direction of extension, and a second tapered section 56 formed by reducing the inner diameter of the through hole 22 at the second adjacent section 48 extending from the first tapered section 54 in the direction of extension.

[0063] By setting the cross-sectional area of ​​the gap 38 to correspond to the inner diameter of the through hole 22, for example, the cross-sectional area of ​​the deceleration section 46 can be set easily and with high precision compared to the case where the outer diameter of the needle body 12 at the deceleration section 46 is smaller than the outer diameter of the needle body 12 at each of the first adjacent section 44 and the second adjacent section 48. In addition, by setting the deceleration section 46 to have the shape of the first tapered section 54 and the second tapered section 56, when the needle hub 16 is manufactured by injection molding as described above, the operation of pulling out the core pin whose shape corresponds to the through hole 22 from the injection molded body can be easily performed.

[0064] It should be noted that in the medical needle 10, the cross-sectional area of ​​the deceleration section 46 can be made larger than the cross-sectional areas of the first adjacent portion 44 and the second adjacent portion 48 by making the outer diameter of the needle body 12 at the deceleration section 46 smaller than the outer diameter of the needle body 12 at each of the first adjacent portion 44 and the second adjacent portion 48. Alternatively, the deceleration section 46 may not have the first tapered portion 54 and the second tapered portion 56. In this case, the inner diameter of the through hole 22 at the deceleration section 46 can also be constant in the extending direction. Furthermore, the inner circumferential surface 22a of the through hole 22 at the deceleration section 46 can also be curved into an arc shape.

[0065] In the medical needle 10 of the above embodiment, the gap 38 has an insertion portion 40 extending from the injection opening 34 to the other end (base end side) in the extending direction, and the cross-sectional area of ​​the gap 38 is largest at the insertion portion 40. In this case, adhesive 18 can be easily supplied to the gap 38 from the injection opening 34 and the insertion portion 40.

[0066] In the medical needle 10 of the above embodiment, a transfer section 42 with a cross-sectional area smaller than that of the introduction section 40 and larger than that of the first adjacent section 44 is provided between the introduction section 40 and the first adjacent section 44 in the extension direction. In this case, the flow rate of the adhesive 18 flowing in the gap 38 and the amount of adhesive 18 filled into the gap 38 when the downstream end of the adhesive 18 reaches the set position 58 can be easily adjusted.

[0067] This invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of this invention.

[0068] For example, in the above embodiment, an injection opening 34 is provided on the front end side (arrow X1 side) in the extending direction of the through hole 22, and the needle tip 12a side of the needle body 12 protrudes from the injection opening 34. The adhesive 18 flows through the gap 38 from the front end side in the extending direction of the through hole 22 toward the base end side (arrow X2 side). Alternatively, the injection opening 34 may be provided on the base end side in the extending direction of the through hole 22, and the base end portion 12b side of the needle body 12 protrudes from the injection opening 34. The adhesive 18 flows through the gap 38 from the base end side in the extending direction of the through hole 22 toward the front end side.

Claims

1. A medical needle, comprising: Needle body; A needle hub having a through hole for inserting the needle body; The medical needle is characterized by an adhesive present in the gap between the outer peripheral surface of the needle body and the inner peripheral surface of the through hole, which joins the needle body to the needle hub. The needle body protrudes outward from the through hole through an injection opening located at one end in the extending direction of the through hole. The gap has: a deceleration portion disposed at the other end of the extension direction compared to the injection opening; and a first abutment portion abutting the deceleration portion at one end of the extension direction compared to the deceleration portion. The second adjacent portion is adjacent to the deceleration portion at the other end side in the extending direction compared to the deceleration portion; And an inlet portion, which extends from the injection opening toward the other end in the extending direction. In the deceleration section, the cross-sectional area orthogonal to the extending direction is larger than that of both the first adjacent section and the second adjacent section. A predetermined position is provided at the boundary between the deceleration section and the second adjacent section. The adhesive is filled between at least the injection opening and the set position in the gap. The cross-sectional area of ​​the gap is largest at the inlet portion. In the extending direction, a transfer portion is provided between the inlet portion and the first adjacent portion, the cross-sectional area of ​​which is smaller than that of the inlet portion and larger than that of the first adjacent portion.

2. The medical needle according to claim 1, characterized in that, In the deceleration section, because the inner diameter of the through hole is large, the cross-sectional area is larger than that of both the first adjacent portion and the second adjacent portion. The deceleration section has: a first tapered section formed by expanding the inner diameter of the through hole as it moves from the first adjacent section toward the other end side in the extending direction; and a second tapered section formed by reducing the inner diameter of the through hole as it moves from the first tapered section toward the second adjacent section.

3. A medical needle, comprising: Needle body; A needle hub having a through hole for inserting the needle body; The medical needle is characterized by an adhesive present in the gap between the outer peripheral surface of the needle body and the inner peripheral surface of the through hole, which joins the needle body to the needle hub. The needle body protrudes outward from the through hole through an injection opening located at one end in the extending direction of the through hole. The gap has: a deceleration portion disposed at the other end of the extension direction compared to the injection opening; and a first abutment portion abutting the deceleration portion at one end of the extension direction compared to the deceleration portion. And a second adjacent portion, which is adjacent to the deceleration portion at the other end in the extending direction compared to the deceleration portion. In the deceleration section, the cross-sectional area orthogonal to the extending direction is larger than that of both the first adjacent section and the second adjacent section. A predetermined position is provided at the boundary between the deceleration section and the second adjacent section. The adhesive is filled between at least the injection opening and the set position in the gap. The injection opening is located at the front end of the needle hub. In the deceleration section, because the inner diameter of the through hole is large, the cross-sectional area is larger than that of both the first adjacent portion and the second adjacent portion. The deceleration section includes: a first tapered portion formed by expanding the inner diameter of the through hole as it moves from the first adjacent portion toward the base end of the needle hub; and a second tapered portion formed by reducing the inner diameter of the through hole as it moves from the first tapered portion toward the second adjacent portion. The gap further comprises: an inlet portion (40) extending from the injection opening toward the base end; an inlet cone portion (50) adjacent to the base end side of the inlet portion; and a transfer portion (42) adjacent to the base end side of the inlet cone portion. and the relay cone (52), which is adjacent to the base end side of the relay section, The cross-sectional area of ​​the gap is largest at the inlet portion. The diameter of the inlet tapered portion decreases as it moves toward the base end. The cross-sectional area of ​​the transfer section is smaller than that of the inlet section but larger than that of the first adjacent section, and the transfer section extends parallel to the axis of the needle hub. The relay tapered portion narrows in diameter as it moves toward the base end. The first adjacent portion is adjacent to the base end side of the relay cone portion. The cross-sectional area of ​​the first adjacent portion is the same as the cross-sectional area of ​​the second adjacent portion.

4. A method for manufacturing a medical needle, wherein the needle body and needle hub are joined by means of an adhesive to obtain the medical needle, the method for manufacturing the medical needle being characterized by comprising the following steps: In the needle insertion process, the needle body is inserted into the through hole provided in the needle hub, and the needle body protrudes from the injection opening at one end of the through hole in the extending direction of the through hole to the outside of the through hole. as well as In the adhesive supply process, the adhesive is supplied from the injection opening into the gap between the outer peripheral surface of the needle body and the inner peripheral surface of the through hole. The gap includes: a deceleration portion disposed at the opposite end of the extension direction compared to the injection opening; a first abutment portion adjacent to the deceleration portion at one end of the extension direction compared to the deceleration portion; a second abutment portion adjacent to the deceleration portion at the opposite end of the extension direction compared to the deceleration portion; and an inlet portion extending from the injection opening toward the opposite end of the extension direction. In the deceleration section, the cross-sectional area orthogonal to the extending direction is larger than that of both the first adjacent section and the second adjacent section. A predetermined position is provided at the boundary between the deceleration section and the second adjacent section. In the adhesive supply process, the adhesive is filled from the injection opening into the gap until at least the set position is reached. The cross-sectional area of ​​the gap is largest at the inlet portion. In the extending direction, a transfer portion is provided between the inlet portion and the first adjacent portion, the cross-sectional area of ​​which is smaller than that of the inlet portion and larger than that of the first adjacent portion.

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