Syringe connector

Abstract

To provide a syringe connector that has safety and sufficient fitting strength to a syringe and can be produced readily.SOLUTION: A syringe connector (30) includes: a first member (40) including a connection part (41) to be fitted to a part to be fitted of a syringe (10); and a second member (60) including a connector flow channel (66) through which a fluid discharged from the syringe (10) circulates. The first member (40) is formed of a resin including a mixture, while the second member (60) is formed of a resin not including a mixture.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a connector connected to the tip of a syringe.

Background Art

[0002] Conventionally, as described in Non-Patent Document 1, in the medical field, a syringe (syringe barrel) is used for administering a chemical solution, blood sampling, etc. Such a syringe is composed of a barrel (outer cylinder) for storing a chemical solution or the like and a plunger (pusher) inserted into the barrel.

[0003] A connector (barrel tip) conforming to a predetermined standard is attached to the tip of the barrel. This connector is formed so that the needle base of an injection needle, the connector of a catheter, etc. can be connected. Some connectors are made of a metal such as brass that has been plated according to the intended use. A metal connector can maintain the fitting strength with the barrel tip even when stored for a long time.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when connectors were made from metal, there were limitations on the shape and specifications of the connectors due to the processing requirements of metal. Furthermore, metal processing was time-consuming and costly. As a solution, it was proposed to manufacture connectors from resin. In this regard, the material used to form syringe connectors must satisfy both the need for sufficient mating strength with the barrel tip and the need for a safe material that prevents foreign matter from contaminating the liquid (such as medication) flowing from the barrel to the connector. However, manufacturing a resin connector that could satisfy both of these requirements proved difficult. Therefore, there was a need for a safe and easily manufactured connector that could replace metal ones.

[0006] This invention was made to solve the above problems and aims to provide a syringe connector that is safe, has sufficient mating strength with the syringe, and can be easily manufactured. [Means for solving the problem]

[0007] The syringe connector according to the present invention comprises a first member having a connecting portion that fits into the connecting portion of a syringe, and a second member having a connector channel through which the fluid discharged from the syringe flows, wherein the first member is made of a resin containing a mixture, and the second member is made of a resin without a mixture. The mixture consists of fibers or carbon tubes. .

[0008] The syringe connector according to the present invention comprises a first member having a connecting portion that fits into the part of the syringe to be connected, and a second member having a substantially cylindrical connector channel through which the fluid discharged from the syringe flows. The first member is made of a resin containing a mixture, and the second member is made of a resin without a mixture. Therefore, the first member, which has a connecting portion that fits into a predetermined part of the syringe and requires a high mating force, can be made of a material containing a mixture to increase strength and rigidity, and the second member, which has a connector channel through which the fluid discharged from the syringe flows, can be made of a safe material that does not have the possibility of material separation, thus allowing each to be formed of the most suitable material. Consequently, the syringe connector according to the present invention can be a syringe connector that has a high mating force and is safe.

[0009] Furthermore, regarding the syringe connector according to the present invention, the mixture is a fiber. Or it's a carbon tube.

[0010] The syringe connector according to the present invention uses a resin that forms the first member, which is a fiber. or carbon tube It contains [a certain substance]. Therefore, the first component is made of fibers that are easily mixed into the resin. or carbon tube By including the fiber, it can achieve a high mating force with the syringe, and carbon tubes The second component 60, which does not contain fibers, may separate into the chemical solution. and carbon tubes It can be formed without containing [certain substances], thus providing high safety.

[0011] Furthermore, in the syringe connector according to the present invention, it is preferable that the first member and the second member are connected only by fitting their contact surfaces together.

[0012] In the syringe connector according to the present invention, the first member and the second member are connected only by the fitting of their contacting surfaces, and since no other materials such as adhesives are used, no other substances will be mixed into the fluid discharged from the syringe. Therefore, a syringe connector with higher safety can be achieved. Each of the contact surfaces that come into contact with each other has a pair of interlocking parts that interlock with each other.

[0013] Furthermore, in the syringe connector according to the present invention, it is preferable that the first member and the second member each have a pair of fitting portions that interlock with each other on their respective contact surfaces.

[0014] The first and second members of the syringe connector according to the present invention each have a pair of mating portions that interlock with each other on their respective contact surfaces. Therefore, the syringe connector according to the present invention can be configured to have high mating force and be safe through a simple and reliable joining method of mating.

[0015] Furthermore, regarding the syringe connector according to the present invention, it is preferable that the first member has a first fitting portion which is one of a pair of fitting portions, the second member has a second fitting portion which is the other of a pair of fitting portions, the first member is provided with a first indicator portion corresponding to the rotational position of the first fitting portion around the central axis of the first member, and the second member is provided with a second indicator portion corresponding to the rotational position of the second fitting portion around the central axis of the second member.

[0016] The first and second members of the syringe connector according to the present invention are each provided with a first mating portion and a first indicator portion and a second indicator portion corresponding to the rotational angular position of the second mating portion. Therefore, the first and second members, each having a mating structure that allows them to mate only at specific rotational angular positions, can be easily mated together. Thus, syringe connectors can be manufactured efficiently.

[0017] The inner diameter of the connection portion of the syringe connector according to the present invention is preferably 94% or more and 98% or less of the outer diameter of the connected portion at the corresponding position.

[0018] The inner diameter of the connection portion of the syringe connector according to the present invention is 94% to 98% of the outer diameter of the corresponding connected portion, and is formed in a dimensional relationship for an interlocking fit. Therefore, the syringe connector according to the present invention can be press-fitted into the connected portion of a syringe, and can also have sufficient pull-out strength and mating strength during long-term storage.

[0019] The radial thickness of the connecting portion of the syringe connector according to the present invention is preferably 2 mm or more and 3 mm or less in the portion other than the rounded or chamfered portion provided at the end in the direction of the central axis X of the connecting portion.

[0020] Because the radial plate thickness of the connecting portion of the syringe connector according to the present invention is formed within the above range, the syringe connector according to the present invention can have sufficient pull-out strength against the syringe while reducing molding defects such as warping and sink marks.

[0021] For the syringe connector according to the present invention, it is preferable that the second member has a disk portion, and the second indicating portion is a non-circular portion formed by cutting out an outer peripheral portion of the disk portion.

[0022] Since the second indicating portion of the syringe connector according to the present invention is a non-circular portion provided on the outer peripheral portion of the disk portion of the second member, it can be easily formed, and since it is arranged on the outer peripheral portion of the disk portion, when assembling this connector, it is easy to grasp the rotational direction position of the second member, and it is also easy to grip the periphery of the second indicating portion. Therefore, the syringe connector can be easily manufactured.

[0023] The first member of the syringe connector according to the present invention has an outer cylinder portion connected to a mating connector, and an intermediate portion connecting the connecting portion and the outer cylinder portion, and the inner peripheral surface of the connecting portion is located between the inner peripheral surface and the outer peripheral surface of the outer cylinder portion in the radial direction, and it is preferable that the outer peripheral surface of the connecting portion is located outside the outer peripheral surface of the outer cylinder portion in the radial direction.

[0024] In the first member of the syringe connector according to the present invention, the inner peripheral surface of the connecting portion is located between the inner peripheral surface and the outer peripheral surface of the outer cylinder portion in the radial direction, and the outer peripheral surface of the connecting portion is located outside the outer peripheral surface of the outer cylinder portion in the radial direction. Therefore, while moderately restraining the deformation of the outer peripheral side portion of the connecting portion to increase the fitting strength, the connecting portion is held by the outer cylinder portion to prevent the generation of locally excessive stress, and the fitting strength can be stably increased.

[0025] The syringe connector according to the present invention is arranged so as to be sandwiched in the central axis direction between the syringe and the syringe connector, includes a seal member that is more easily deformed than the syringe connector, and it is preferable that the syringe connector has a groove that is continuous in the circumferential direction on the surface that contacts the seal member.

[0026] The syringe connector according to the present invention includes a sealing member between the syringe and the syringe connector that is more easily deformed than the syringe connector, and the syringe connector has a groove that is continuous in the circumferential direction on the surface that contacts the sealing member. With the above structure, the syringe connector according to the present invention can improve the sealing performance compared to when there is no groove, by causing the sealing member to bulge into the groove and the physical shape of the corners of the groove.

[0027] The syringe connector according to the present invention preferably has a connecting portion whose inner circumferential surface is frustoconical or cylindrical, is provided on the glass barrel of the syringe, and is fitted onto the connecting portion whose outer circumferential surface is frustoconical or cylindrical by a crimp fit.

[0028] The syringe connector according to the present invention has a connecting portion whose inner circumferential surface is frustoconical or cylindrical, and is provided on the glass barrel of the syringe. The connecting portion, whose outer circumferential surface is frustoconical or cylindrical, is fitted onto the connecting portion by an interlocking fit. Therefore, insertion into the connector is facilitated, and the tightness with the connector is improved, thereby increasing the mating strength. [Brief explanation of the drawing]

[0029] [Figure 1] This is a perspective view showing a connector according to an embodiment of the present invention connected to a syringe. [Figure 2] Figure 1 is a front view of the connector and syringe. [Figure 3] Figure 2 shows a cross-sectional view taken parallel to the central axis passing through the connector and syringe. [Figure 4] This is a right side view of the first member shown in Figure 1. [Figure 5] This is a right side view of the second member in Figure 1. [Figure 6] This is a left side view of the second member in Figure 1. [Modes for carrying out the invention]

[0030] <Embodiment> The connector 30 according to an embodiment of the present invention will be described with reference to Figures 1 to 3. Figure 1 is a perspective view showing the connector 30 attached to the syringe 10. Figure 2 is a side view of the connector 30 and syringe 10 in Figure 1. Figure 3 is a cross-sectional view of Figure 2 taken from a plane including the central axis X. The connector 30 is configured to be attached to a syringe compliant with the ISO 80369-6 standard.

[0031] Syringe 10 is used for administering drug solutions, collecting blood, etc., and as is well known, it consists of a barrel 11 and a plunger (not shown). The barrel 11 is formed in a substantially cylindrical shape with an internal space for containing fluids such as drug solutions, saline solution, or air. The barrel 11 has a tip portion 12 at the connector end and a flange portion 13 at the end opposite the tip portion 12. The barrel 11 is made of glass, for example, borosilicate glass.

[0032] The tip portion 12 has a connected portion 14 that protrudes from the barrel end face 19 on the tip portion 12 side of the barrel 11, which is formed in a substantially cylindrical shape. The connected portion 14 is formed with an outer diameter d2 that is connected to the barrel end face 19 via a constricted portion 16, and its outer circumferential surface is a frustoconical or cylindrical portion. A connected portion tip surface 15 is formed on the tip surface of the connected portion 14 on the connector side. The connected portion 14 and the constricted portion 16 are integrally formed as part of the barrel 11. Inside the connected portion 14, there is a syringe channel 18 that communicates with the internal space of the barrel 11 and penetrates from the barrel end face 19 to the connected portion tip surface 15 along the central axis X of the connected portion 14. The inner diameter d1 of the syringe channel 18 on the barrel end face 19 side is the maximum inner diameter portion of the syringe channel 18, and the inner diameter d1 of the syringe channel 18 is formed in a substantially conical shape that gradually decreases in diameter toward the tip face 15 of the connected portion. The side of the syringe channel 18 toward the tip face 15 of the connected portion is formed with a constant inner diameter d1 and opens at the tip face 15 of the connected portion.

[0033] The connector 30 will be described with reference to Figures 3 to 6. The connector 30 comprises a first member 40 and a second member 60 fitted and housed inside the first member 40. Figure 4 is a right side view of the first member 40 as seen from the right side in Figure 3, i.e., from the syringe 10 side. Figure 5 is a right side view of the second member 60 as seen from the right side in Figure 3, i.e., from the syringe 10 side. Figure 6 is a left side view of the second member 60 as seen from the left side in Figure 3, i.e., from the tip side of the connector 30.

[0034] The first member 40 has a cylindrical connecting portion 41 that fits onto the outer surface of the connected portion 14, an outer cylinder portion 42 that is connected to the connecting portion 41 with the central axis X coaxially, and an intermediate portion 43 that connects the connecting portion 41 and the outer cylinder portion 42. The connecting portion 41 is the part that fits onto the connected portion 14 of the syringe 10. The inner circumferential surface of the connecting portion 41 is formed in the shape of a frustoconical or cylindrical shape with an inner diameter d3 so as to fit onto the connected portion 14.

[0035] The outer cylinder portion 42 is a cylindrical portion formed by a cylindrical surface parallel to the central axis X, and the syringe-side end of the outer cylinder portion 42 is connected to the tip side of the intermediate portion 43. The outer cylinder portion 42 may have a threaded projection on its inner surface that can be screw-fitted with a threaded portion of a female connector (not shown) to which the connector 30 is connected. In that case, the connector 30 can also be used with a mating connector that has a threaded groove formed in the collar.

[0036] The intermediate portion 43 is fixed so as to close the tip end of the cylindrical connecting portion 41. The intermediate portion 43 has an intermediate portion first end face 45, which is the surface facing the syringe 10, and an intermediate portion central hole 46 in the center. The intermediate portion central hole 46 is a hole through which the inner cylinder portion 62 of the second member 60, which will be described later, passes, and is formed with an inner diameter that is approximately the same as the outer diameter of the base end of the inner cylinder portion 62 connected to the intermediate portion 43. The intermediate portion central hole 46 may be formed with an inner diameter that is slightly smaller than the outer diameter of the base end of the inner cylinder portion 62 of the second member 60, that is, the end of the inner cylinder portion 62 on the intermediate portion first end face 45 side, so that the intermediate portion central hole 46 and the inner cylinder portion 62 are in surface contact with each other with their curved surfaces and fitted together by interference fit. Alternatively, the inner circumferential surface of the central hole 46 in the intermediate portion and the outer circumferential surface of the inner cylinder portion 62 that contacts the inner circumferential surface may be provided with a recess on one side and a protrusion on the other side, thereby creating a recessed-convex-convex fitting that allows them to fit together.

[0037] The inner diameter of the inner circumferential surface of the connecting portion 41 is formed to be approximately the same as the outer diameter of the outer circumferential surface of the opposing disc portion 61. Alternatively, the inner diameter of the inner circumferential surface of the connecting portion 41 may be formed to be slightly smaller than the outer diameter of the outer circumferential surface of the disc portion 61, so that the inner circumferential surface of the connecting portion 41 and the outer circumferential surface of the disc portion 61 are in surface contact with each other on their curved surfaces and fitted together by an interlocking fit. Alternatively, a concave portion may be provided on one of the inner circumferential surface of the connecting portion 41 and the outer circumferential surface of the disc portion 61 that the inner circumferential surface of contacts, and a convex portion on the other, so that they fit together in a concave-convex-convex fit.

[0038] The first member 40 and the second member 60 may be fixed to each other by a fixing method other than fitting. Other fixing methods include, for example, welding. The first member 40 and the second member 60 may be welded at the parts that come into contact with each other, for example, the inner circumferential surface of the connecting part 41 and the outer circumferential surface of the disc part 61, or the inner circumferential surface of the central hole 46 of the intermediate part and the outer circumferential surface of the inner cylinder part 62. The welding method may be, for example, ultrasonic welding or laser welding. Alternatively, the first member 40 and the second member 60 may be fitted together in a bayonet fitting in which a recess and a convex part are formed in the rotational direction. Alternatively, the first member 40 and the second member 60 may be fitted together in a snap fitting in which a recess and a convex part are formed in the direction of the central axis X.

[0039] As shown in Figure 4, a first fitting portion 47, which is one of a pair of fitting portions, is formed on the first end face 45 of the intermediate portion. The first fitting portion 47 is a portion that fits with the corresponding portion of the second member 60 to prevent rotation. The first fitting portion 47 is one or more recesses, grooves, etc., formed radially with a constant groove width L1 from the central hole 46 of the intermediate portion to the outer peripheral end of the first end face 45 of the intermediate portion. Four first fitting portions 47 are formed with a constant groove width L1 at 90° intervals in the circumferential direction with the central hole 46 of the intermediate portion as the center. The number of first fitting portions 47 may be other than four; there may be one in the circumferential direction of the first end face 45 of the intermediate portion, or two to six may be formed at the same angular intervals in the circumferential direction with the central hole 46 of the intermediate portion as the center.

[0040] The outer circumferential surface of the connecting portion 41 is provided with a first indicator portion 48 corresponding to the rotational angular position of the first fitting portion 47 around the central axis X of the first member 40. The first indicator portion 48 is a part used to align the rotational angular positions of the first member 40 and the second member 60 when assembling them. The first indicator portion 48 is a U-shaped groove cut out from the outer circumference of the connecting portion 41 toward the center. The first indicator portion 48 includes a straight line parallel to a straight line tangent to the outer circumference of the connecting portion 41 and straight lines perpendicular to the straight line at both ends of the straight line. As shown in Figure 2, the first indicator portion 48 is provided along the entire length of the connecting portion 41 in the direction of the central axis X of the connecting portion 41. Two first indicator portions 48 are formed on the outer circumference of the disc portion 61 at 180° intervals. The first indicator portions 48 are provided at the same rotational angular position as the first fitting portion 47 in the rotational direction of the connecting portion 41. The first indicator portion 48 may be provided at a rotational angular position different from that of the first fitting portion 47.

[0041] The inner diameter d3 of the connecting portion 41 is formed to be 94% to 98% of the outer diameter d2 of the connected portion 14, and the connecting portion 41 and the connected portion 14 are in an interlocking fit. If the inner diameter d3 of the connecting portion 41 falls below the above range, it becomes difficult to press-fit the connecting portion 41 into the connected portion 14. Also, if the inner diameter d3 of the connecting portion 41 exceeds the above range, the tightening force of the connecting portion 41 decreases. As a result, sufficient pull-out strength of the connecting portion 41 from the connected portion 14 cannot be obtained. Furthermore, creep deformation during long-term storage may prevent the maintenance of the required fitting strength (for example, fitting strength that can withstand a pull-out load of 78N for 5 minutes as specified in JIS T3201-1979).

[0042] The relationship between the radial dimensions of the connecting portion 41 and the outer cylinder portion 42, which form the first member 40, will now be explained. The inner diameter d3 of the connecting portion 41 is larger than the inner diameter d5 of the outer cylinder portion 42 and smaller than the outer diameter d6. Also, the outer diameter d4 of the connecting portion 41 is larger than the outer diameter d6 of the outer cylinder portion 42. In other words, in the direction perpendicular to the central axis X direction of the connector 30, i.e., in the radial direction, the inner circumferential surface of the connecting portion 41 is located between the inner circumferential surface and the outer circumferential surface of the outer cylinder portion 42. Also, the outer circumferential surface of the connecting portion 41 is located outside the outer circumferential surface of the outer cylinder portion 42. This allows for moderate restraint of deformation in the outer circumferential portion of the connecting portion 41 to increase the fitting strength, while the connecting portion 41 is held by the outer cylinder portion 42, preventing the generation of locally excessive stress and stably increasing the fitting strength.

[0043] The thickness of the connecting portion 41 is formed to a dimension of 2 mm to 3 mm in the portion other than the rounded or chamfered portion provided at the end of the connecting portion 41 in the direction of the central axis X. Increasing the thickness of the connecting portion 41 improves the strength and rigidity of the connecting portion 41, but increasing the thickness beyond the above increases the possibility of molding defects such as warping and sink marks. By forming it to the above thickness, the connector 30 can have a pull-out strength of 300 N or more against the syringe 10 while reducing molding defects.

[0044] The first member 40 is formed from a resin containing a mixture. The resin containing the mixture may be a mixture of multiple resins. The first member 40 may also be formed from a resin containing a mixture other than resin. The strength and rigidity of the first member 40 are improved by the inclusion of a mixture in the resin. The resin forming the first member 40 is preferably polyamide resin (PA). Polyamide resin has high chemical and biological safety and has a proven track record in the medical field, mainly used as a material for sutures and catheters in the medical device field. In addition, polyamide resin has high creep resistance and has the characteristic that the mating strength does not easily decrease even when the connector 30 is stored for a long period of time mated to the barrel 11. Polyamide resin (PA) includes aliphatic polyamides and aromatic polyamides, and either can be used. Aliphatic polyamide resins are, for example, nylon 66, nylon 6, etc. Aromatic polyamides are para-aramid and meta-aramid. The mixture can be any mixture that enhances the strength and rigidity of the first member 40. The mixture may be, for example, fibers. These fibers may include glass fibers, aramid fibers (Kevlar fibers), carbon fibers, Zylon fibers, polyethylene fibers (Dyneema), boron fibers, etc. Alternatively, the mixture may also be carbon tubes containing carbon nanotubes.

[0045] The second member 60 is a member that forms a connector channel 66 through which the drug solution or the like discharged from the syringe 10 flows. The second member 60 has a disc portion 61 and an inner cylindrical portion 62 connected to the disc portion 61. The inner cylindrical portion 62 is connected to the second end face 64 of the disc portion 61 with the disc portion 61 and the central axis X coaxially, and the two are formed integrally. The second member 60 has a connector channel 66 which is a through hole provided in both the disc portion 61 and the inner cylindrical portion 62. The connector channel 66 is a substantially cylindrical space through which the fluid such as the drug solution discharged from the syringe channel 18 flows. The connector channel 66 is formed to be extremely small in diameter, which can reduce the amount of residue such as the drug solution that remains in the connector channel 66 without being pushed out compared to conventional designs.

[0046] The disc portion 61 is a disc-shaped member formed with an outer diameter slightly smaller than the inner diameter d3 of the first member 40, and has a first end face 63 and a second end face 64. In the center of the first end face 63 of the disc portion, an inlet 67 is formed, which is part of the connector channel 66, into which the drug solution discharged from the syringe channel 18 flows directly.

[0047] As shown in Figure 5, the inlet portion 67 has a cross-sectional shape with respect to the central axis X of the connector 30, which is formed in the shape of a circle cut out by two substantially parallel straight lines. Also, the cross-sectional shape of the connector flow path 66 with respect to the central axis X of the connector 30 on the tip side of the inlet portion 67 is formed in the direction of the central axis X. The minimum inner dimension of the inlet portion 67 is larger than the maximum inner dimension of the substantially circular cross-section of the connector flow path 66 on the tip side of the inlet portion 67. In other words, the inner circumferential surface of the connector flow path 66 is configured in two stages in the direction of the central axis X. The minimum inner dimension of the inlet portion 67 is larger than the inner diameter d1 of the syringe flow path 18 at the tip surface 15 of the connected portion of the syringe 10, and is approximately 2 to 3 times larger.

[0048] A second fitting portion 65, which is the other half of a pair of fitting portions, is formed on the second end face 64 of the disc portion 61. The second fitting portion 65 is a portion that fits with the first fitting portion 47 formed on the first end face 45 of the intermediate portion of the first member 40 to prevent rotation. The second fitting portion 65 is a protrusion or ridge formed with a constant width L2 in the radial direction on the first end face 45 of the intermediate portion, from the inner cylinder portion 62 to the outer peripheral end of the disc portion 61. The second fitting portion 65 is connected to the surface of the base end of the inner cylinder portion 62 and is formed integrally. Therefore, the second fitting portion 65 has the effect of improving the bending rigidity of the inner cylinder portion 62 and preventing bending and breaking of the inner cylinder portion 62. Four second fitting portions 65 are formed with a constant width L2 at 90° intervals in the circumferential direction centered on the base end of the inner cylinder portion 62. The number of second fitting portions 65 may be other than four, as long as they can be fitted together with the first fitting portions 47. The second fitting portions 65 may be formed as one in the circumferential direction of the first end face 45 of the intermediate portion, or as two to six in the circumferential direction at the same angular intervals with respect to the central hole 46 of the intermediate portion.

[0049] Between the first end face 63 of the disc portion and the tip face 15 of the connected portion of the syringe 10, a sealing member 20 is positioned so as to be sandwiched between the two in the direction of the central axis X, and is made of a material that is more easily deformed than the syringe connector 39. The sealing member 20 prevents leakage of liquid medicine, etc. The sealing member 20 is circular and has a central hole 21 in its center, and is made of a thin elastic material, such as silicone rubber. An annular groove 71 is formed on the first end face 63 of the disc portion, which is continuous in the circumferential direction with a predetermined radius. The annular groove 71 causes the sealing member 20 to bulge at the location of the annular groove 71, and the physical shape of the corners formed on the first end face 63 of the disc portion of the annular groove 71 improves the sealing performance compared to when there is no annular groove 71.

[0050] A second indicator portion 69 is formed on the outer circumference of the disc portion 61, corresponding to the rotational angular position of the second fitting portion 65 around the central axis of the second member 60. The second indicator portion 69 is a part used to align the rotational angular positions of the first member 40 and the second member 60 when assembling them. The second indicator portion 69 is a so-called D-cut shape, formed by cutting off the arc portion of the outer circumference of the disc portion 61 with a straight line perpendicular to the radial direction, and two of them are formed on the outer circumference of the disc portion 61 at 180° intervals. In other words, the second indicator portion is a non-circular portion formed by cutting out the outer circumference of the disc portion 61. The second indicator portion 69 is provided at the same rotational angular position as the second fitting portion 65 in the rotational direction of the disc portion 61. The second indicator portion 69 may be provided at a rotational angular position different from that of the second fitting portion 65. Therefore, since the second indicator portion 69 is a non-circular portion provided on the outer circumference of the disc portion 61 of the second member 60, it can be easily formed, and because it is located on the outer circumference of the disc portion 61, it is easy to grasp the rotational position of the second member 60 and easy to grip around the second indicator portion 60 when assembling the connector 30.

[0051] The second component 60 can be made of any resin that is chemically and biologically safe. The second component 60 is made of, for example, polyamide resin (PA). Polyamide resin (PA) is chemically and biologically safe and has a proven track record in the medical field, mainly used as a material for sutures and catheters in medical devices. Polyamide resin (PA) includes aliphatic polyamides and aromatic polyamides, and either can be used. Aliphatic polyamide resins include, for example, nylon 66 and nylon 6. Aromatic polyamides include para-aramids and meta-aramids. Furthermore, since the second component 60 forms a connector channel 66 through which a drug solution flows, the second component 60 does not contain any mixtures that may cause separation in the drug solution, such as fibers.

[0052] The central hole 21 of the sealing member and the connector channel 66 form a channel space 68 through which the drug solution discharged from the syringe channel 18 flows. The materials constituting the second member 60, which is in contact with the channel space 68, and the sealing member 20 do not contain materials that may detach into the drug solution, such as glass fibers. Therefore, the drug solution is injected into the patient's body without containing any foreign matter.

[0053] Since the first member 40 and the second member 60 are manufactured by resin molding, the connector 30 can be colored to the desired color at a lower cost than a metal connector. In the case of a metal connector, it was necessary to perform a painting process after forming the shape of the connector to color it. In contrast, the connector 30 of the present invention, which is manufactured by resin molding, can have pigments mixed into the molding material, allowing the first member 40 and the second member 60 to be colored to the colors specified in ISO standards, etc. Therefore, the connector 30 can be colored to the desired color at a lower cost than a metal connector.

[0054] [How to assemble connector 30] The assembly method for connector 30 is described below. Connector 30 is assembled by passing the inner cylinder portion 62 of the second member through the central hole 46 of the intermediate portion of the first member 40. During assembly, a jig or an automatic assembly machine is used to hold the first member 40 and the second member 60 in a state where their rotational angular positions around their respective central axes X are aligned, using the first indicator portion 48 and the second indicator portion 69. In this state, the inner cylinder portion 62 is passed through the central hole 46 of the intermediate portion, and the second fitting portion 65 of the second member fits into the first fitting portion 47 of the first member 40, completing the assembly of connector 30.

[0055] [Differentiation] The above embodiment can be configured by replacing some of its components as follows.

[0056] The shapes of the first fitting portion 47 and the second fitting portion 65 may be different as long as they can be securely fitted together. For example, the first fitting portion 47 and the second fitting portion 65 may be arranged with the concave and convex directions reversed. Alternatively, the first fitting portion 47 and the second fitting portion 65 may have circumferentially extending concave and convex portions formed at corresponding positions, instead of radially extending concave and convex portions. Alternatively, they may have corresponding concave and convex portions of any shape formed at corresponding parts of the intermediate portion first end face 45 and the disc portion first end face 63.

[0057] Furthermore, the first indicator portion 48 and the second indicator portion 69 may have other shapes as long as the rotational angle positions of the first member 40 and the second member 60 are clearly indicated. For example, the first indicator portion 48 and the second indicator portion 69 may each be arc-shaped grooves. Alternatively, the first indicator portion 48 and the second indicator portion 69 may be omitted. If the first indicator portion 48 and the second indicator portion 69 are omitted, the first member 40 and the second member 60 will have the external shapes shown by dashed lines in Figures 4 and 5.

[0058] The present invention provides a syringe connector that is safe, has sufficient mating strength with the syringe, and can be easily manufactured. [Explanation of Symbols]

[0059] 10 Syringe, 40 First component, 47 First fitting part (fitting part), 48 First indicator section, 60 Second member, 61 Disc section, 65 Second fitting portion (fitting portion), 68 Flow channel space, 69 Second indicator portion.

Claims

1. It comprises a first member having a connecting portion that fits into the connected portion of a syringe, and a second member having a connector channel through which the fluid discharged from the syringe flows. The first member is formed of a resin containing a mixture, The second member is made of a resin that does not contain a mixture, The aforementioned mixture is a fiber or carbon tube, and is a syringe connector.

2. The syringe connector according to claim 1, wherein the first member and the second member are fixed to each other solely by the fitting of their surfaces that come into contact with each other.

3. The syringe connector according to claim 2, wherein the first member and the second member each have a pair of fitting portions that interlock with each other on their respective contact surfaces.

4. The first member has a first fitting portion which is one of the pair of fitting portions, The second member has a second fitting portion which is the other of the pair of fitting portions, The first member is provided with a first indicator portion corresponding to the rotational angular position of the first fitting portion around the central axis of the first member, The syringe connector according to claim 3, wherein the second member is provided with a second indicator portion corresponding to the rotational angular position of the second fitting portion around the central axis of the second member.

5. The syringe connector according to any one of claims 1 to 2, wherein the inner diameter of the connecting portion is 94% or more and 98% or less of the outer diameter of the connected portion at the corresponding position.

6. The syringe connector according to any one of claims 1 to 2, wherein the radial thickness of the connecting portion is 2 mm or more and 3 mm or less in the portion other than the rounded portion or chamfered portion provided at the end of the connecting portion 41 in the direction of the central axis X.

7. The second member has a disc portion, The syringe connector according to claim 4, wherein the second indicator portion is a non-circular portion formed by cutting out the outer peripheral portion of the disc portion.

8. The first member has an outer cylindrical portion connected to the mating connector, and an intermediate portion connecting the connecting portion and the outer cylindrical portion. The inner circumferential surface of the connecting portion is located radially between the inner circumferential surface and the outer circumferential surface of the outer cylinder portion. The outer circumferential surface of the connecting portion is located radially outward from the outer circumferential surface of the outer cylinder portion. A syringe connector according to any one of claims 1 to 2.

9. The device is provided with a sealing member that is positioned between the syringe and the syringe connector in the direction of the central axis and is more easily deformable than the syringe connector. The syringe connector according to any one of claims 1 to 2, wherein the syringe connector has a groove that is continuous in the circumferential direction on the surface that contacts the sealing member.

10. The connecting portion has an inner circumferential surface formed in the shape of a frustoconical or cylindrical shape. A syringe connector according to any one of claims 1 to 2, wherein the outer surface of the glass barrel of the syringe is fitted by an interlocking fit onto a frustoconical or cylindrical connection portion.

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