Needle member

Abstract

SOLUTION: In an operation auxiliary member 24 of a needle member 10, a part of a shaft 80 is inserted into a hub lumen 52, and a base end part of an inner needle 36 is inserted into a shaft lumen 88. The operation part 82 is exposed to an external part of the hub main body 46. Following to displacement of the operation part 82 in the base end direction by operation of a user 79, the shaft 80 is moved in the base end direction, and an action part 84 presses a gasket 70 of a syringe 14 in the base end direction.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a needle member.

Background Art

[0002] Patent Document 1 discloses an injection needle (needle member). The injection needle has a needle body and a needle hub. The needle body has a needle lumen. The needle hub has a hub lumen. The proximal end side of the needle body is fixed to the tip of the needle hub. The tip of a syringe having a syringe lumen fits into the proximal end of the needle hub.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When collecting blood from a patient, the user holds the needle hub with one hand and punctures the tip of the needle body into the patient's blood vessel. After securing the blood vessel, the user pulls the plunger of the syringe in the proximal direction of the syringe with the other hand, thereby moving the gasket disposed in the syringe lumen in the proximal direction. As a result, the blood in the blood vessel is sucked into the syringe lumen.

[0005] As described above, with the conventional needle member, the user needs to use both hands to collect blood, so the procedure becomes complicated.

Means for Solving the Problems

[0006] (1) Aspects of the present invention include a needle body having a needle lumen, a cylindrical hub body having a hub lumen, a needle holding portion provided on the distal end side of the hub body for holding the proximal end side of the needle body, and a hub body provided on the proximal end side of the hub body. A syringe fitting portion into which the distal end portion of a syringe having a syringe lumen can be fitted, and an operation assisting member for assisting a user's operation for moving a gasket disposed in the syringe lumen when the distal end portion of the syringe is fitted into the syringe fitting portion. The operation assisting member includes a cylindrical shaft having at least a part inserted into the hub lumen and having a shaft lumen into which the proximal end portion of the needle body is inserted, an operation portion connected to the shaft and exposed outside the hub body, and a shaft provided at the proximal end portion of the shaft. An acting portion, and an opening provided in the shaft for allowing a liquid to flow out of the shaft lumen. When the distal end portion of the syringe is fitted into the syringe fitting portion, the shaft is inserted into the distal end portion of the syringe, the opening communicates with the syringe lumen, and the operation portion is displaced in the proximal end direction of the needle hub (the proximal end direction of the syringe) by the user's operation. Along with this, the shaft moves in the proximal end direction, and the acting portion presses the gasket in the proximal end direction. It is a needle member.

[0007] According to this configuration, when the distal end portion of the syringe is fitted into the syringe fitting portion and the distal end portion of the needle body is punctured into a blood vessel, the user displaces the operation portion in the proximal end direction of the needle hub (the proximal end direction of the syringe) with the hand holding the hub body. Then, the shaft moves in the proximal end direction together with the operation portion. When the shaft moves in the proximal end direction, the acting portion presses the gasket, and the gasket moves in the proximal end direction by the pressing force from the acting portion. As a result, a negative pressure is generated in the portion of the syringe lumen that is more distal than the gasket, and the blood (liquid) in the blood vessel is sucked into the syringe lumen through the needle lumen, the shaft lumen, and the opening. Therefore, according to the present invention, it is possible to perform a blood suction operation with the hand holding the hub body, so that the user's technique can be simplified.

[0008] (2) In the needle member described in (1) above, a notch is formed in the hub body along the axial direction of the shaft, and the operation portion may be exposed to the outside of the hub body through the notch.

[0009] According to this configuration, the length of the notch in the axial direction of the shaft becomes the movable range of the operation portion. Thereby, the user can move the shaft and the acting portion in the axial direction within the movable range of the operation portion by operating the operation portion exposed from the notch in the axial direction. Further, the user can easily operate the operation portion while holding the hub body with one hand.

[0010] (3) In the needle member described in (2) above, a sealing portion is further provided between the tip portion of the syringe and the notch in the hub lumen, for sealing between the outer peripheral surface of the shaft and the inner peripheral surface of the hub body, and the shaft may be slidable in the axial direction with respect to the sealing portion.

[0011] According to this configuration, it is possible to prevent the blood sucked into the syringe lumen from leaking to the outside of the hub body through the notch via the gap between the shaft and the tip portion of the syringe. Further, it is possible to prevent air from entering the syringe lumen through the gap between the shaft and the tip portion of the syringe via the notch.

[0012] (4) In the needle member described in (3) above, a restricting portion is further provided between the sealing portion and the notch in the hub lumen, for restricting the movement of the sealing portion in the tip direction of the needle hub, and when the tip portion of the syringe is fitted to the syringe fitting portion, the sealing portion may be positioned between the restricting portion and the tip portion of the syringe.

[0013] According to this configuration, it is possible to restrict the movement of the sealing portion in the tip direction. Further, when the tip portion of the syringe is fitted to the syringe fitting portion, it is possible to prevent the sealing portion from coming off the hub body.

[0014] (5) In the needle member described in (4) above, the restricting portion may be a convex portion formed on the inner peripheral surface of the hub body.

[0015] According to this configuration, the movement of the seal portion in the tip direction can be effectively restricted. Further, when the tip portion of the syringe is fitted to the syringe fitting portion, it is possible to effectively prevent the seal portion from coming off the hub body.

[0016] (6) In the needle member according to any one of (1) to (5) above, the opening area of the opening may be larger than the cross-sectional area of the needle lumen.

[0017] According to this configuration, blood can be easily aspirated from the needle lumen into the syringe lumen through the shaft lumen and the opening.

[0018] (7) In the needle member according to any one of (1) to (6) above, the acting portion may have a flat surface portion that can be in surface contact with the gasket.

[0019] According to this configuration, the gasket can be effectively pressed in the proximal direction.

Advantages of the Invention

[0020] According to the present invention, when the tip portion of the syringe is fitted to the syringe fitting portion and the tip portion of the needle body is punctured into a blood vessel, when the user displaces the operation portion in the proximal direction of the needle hub (the proximal direction of the syringe) with the hand holding the hub body, the shaft moves in the proximal direction together with the operation portion. When the shaft moves in the proximal direction, the acting portion presses the gasket, and the gasket moves in the proximal direction by the pressing force from the acting portion. As a result, a negative pressure is generated in the portion of the syringe lumen that is more distal than the gasket, and the blood (liquid) in the blood vessel is aspirated into the syringe lumen through the needle lumen, the shaft lumen, and the opening. Therefore, according to the present invention, it is possible to perform a blood aspiration operation with the hand holding the hub body, so that the user's technique can be simplified.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

DETAILED DESCRIPTION OF THE INVENTION

[0022] FIG. 1 is a configuration diagram of a catheter assembly 12 including a needle member 10 according to the present embodiment. The catheter assembly 12 is connectable to a syringe 14.

[0023] The catheter assembly 12 is configured as an indwelling needle 19 to be indwelled in a patient 16. The catheter assembly 12 includes a needle member 10 and a catheter member 20. An operation assisting member 24 is provided on the needle member 10. The catheter member 20, the needle member 10, and the syringe 14 are sequentially connected along the central axis (axis line 26) of the catheter assembly 12. The catheter member 20, the needle member 10, and the syringe 14 are arranged coaxially with the axis line 26.

[0024] In the following description, the direction along the axis line 26 is referred to as the axial direction. Also, the direction toward the catheter member 20 along the axis line 26 is referred to as the distal direction. Further, the direction away from the catheter member 20 along the axis line 26 (the direction toward the syringe 14) is referred to as the proximal direction.

[0025] The catheter member 20 is provided on the distal side of the catheter assembly 12. The catheter member 20 has a catheter body 30 and a catheter hub 32.

[0026] The catheter body 30 is a flexible tubular member. The catheter body 30 has a lumen (not shown) extending along the axis 26. The lumen of the catheter body 30 communicates with the outside of the catheter body 30 through a tip opening formed at the tip of the catheter body 30. The catheter body 30 can be continuously inserted into the blood vessel 34 of the patient 16. The constituent material of the catheter body 30 is, for example, a resin material.

[0027] The catheter hub 32 is provided at the proximal end portion of the catheter body 30. The proximal end portion of the catheter body 30 is connected to the distal end portion of the catheter hub 32. The catheter hub 32 is a tubular member. The catheter hub 32 has a lumen (not shown) extending along the axis 26. The lumen of the catheter hub 32 communicates with the lumen of the catheter body 30. The lumen of the catheter hub 32 communicates with the outside of the catheter hub 32 through a proximal end opening formed at the proximal end of the catheter hub 32. The catheter hub 32 is preferably composed of a material harder than the catheter body 30. The constituent material of the catheter hub 32 is, for example, a resin material.

[0028] The needle member 10 is connected to the proximal end side of the catheter member 20. The needle member 10 includes an inner needle 36 (needle body), a needle hub 38, and an operation assisting member 24.

[0029] The inner needle 36 is a tubular member having a rigidity capable of puncturing the skin 40 of the patient 16. The inner needle 36 is inserted through the inner cavity of the catheter body 30 and the inner cavity of the catheter hub 32. The overall length of the inner needle 36 is sufficiently longer than that of the catheter body 30 and the catheter hub 32. Therefore, the tip of the inner needle 36 protrudes in the tip direction from the tip opening of the catheter body 30. The proximal end side of the inner needle 36 protrudes in the proximal direction from the proximal opening of the catheter hub 32. As shown in FIG. 2, the inner needle 36 has a needle inner cavity 42 extending along the axis 26. The needle inner cavity 42 communicates with the outside of the inner needle 36 through a tip opening formed at the tip of the inner needle 36. The needle inner cavity 42 communicates with the outside of the inner needle 36 through a proximal opening 44 formed at the proximal end of the inner needle 36. The constituent material of the inner needle 36 is, for example, a metal material such as stainless steel.

[0030] The needle hub 38 is provided on the proximal end side of the inner needle 36. The proximal end side of the inner needle 36 is connected to the tip of the needle hub 38. The needle hub 38 may be made of the same material as the catheter hub 32 (see FIG. 1). The constituent material of the needle hub 38 is, for example, a resin material. The needle hub 38 has a hub body 46, a needle holding portion 48, and a syringe fitting portion 50.

[0031] The hub body 46 is a cylindrical member extending along the axis 26. As shown in FIG. 1, the tip of the hub body 46 is connected to the proximal end of the catheter hub 32. Specifically, by fitting the tip of the hub body 46 to the proximal end of the catheter hub 32, the tip of the hub body 46 and the proximal end of the catheter hub 32 are connected.

[0032] As shown in FIG. 2, the hub body 46 has a hub inner cavity 52 extending along the axis 26. The inner surface 54 of the hub body 46 forms the hub inner cavity 52. The hub inner cavity 52 communicates with the outside of the hub body 46 through a proximal opening 60 formed at the proximal end of the hub body 46.

[0033] A notch 62 is formed in the side wall of the hub body 46. The notch 62 is formed in a portion of the side wall of the hub body 46 that forms the hub inner cavity 52. The notch 62 is formed along the axis 26. The hub inner cavity 52 communicates with the outside of the hub body 46 through the notch 62.

[0034] The tip of the hub body 46 forms a needle holding portion 48. An inner needle 36 axially penetrates the needle holding portion 48. The proximal end (proximal end opening 44) of the inner needle 36 is located in the hub inner cavity 52. The inner needle 36 is fixed to and held by the hub body 46 by the needle holding portion 48.

[0035] The syringe fitting portion 50 is a portion of the inner surface 54 of the hub body 46 that forms the hub inner cavity 52 and is on the proximal end side of the notch 62. In the inner surface 54 of the hub body 46, the portion on the proximal end side of the notch 62 expands as it goes in the proximal end direction. In other words, a tapered portion 64 that tapers from the proximal end opening 60 toward the distal end direction is formed in the portion of the inner surface 54 of the hub body 46 on the proximal end side of the notch 62. The syringe fitting portion 50 is the tapered portion 64. The tapered portion 64 is preferably a Luer taper.

[0036] As shown in FIGS. 1 and 2, the syringe 14 includes a barrel 69 having a barrel body portion 66 and a nozzle 68, a gasket 70, and a plunger 72.

[0037] The barrel body portion 66 is the body portion of the syringe 14 (barrel 69). The barrel body portion 66 is a bottomed cylindrical member. The barrel body portion 66 has a barrel inner cavity 74 that extends along the axial direction.

[0038] The nozzle 68 protrudes in the distal end direction from the tip of the barrel body portion 66. The nozzle 68 is formed in a tapered shape that tapers as it goes in the distal end direction. The nozzle 68 is preferably formed in a Luer taper shape. The nozzle 68 has a nozzle inner cavity 76 that extends along the axial direction.

[0039] The barrel inner cavity 74 and the nozzle inner cavity 76 communicate with each other. The barrel inner cavity 74 communicates with the outside of the barrel body 66 through a base end opening formed on the base end side of the barrel body 66. The base end opening of the barrel body 66 is the base end opening of the syringe 14. The nozzle inner cavity 76 communicates with the outside of the nozzle 68 through a tip opening formed on the tip side of the nozzle 68. The tip opening of the nozzle 68 is the tip opening of the syringe 14. The barrel inner cavity 74 and the nozzle inner cavity 76 constitute the syringe inner cavity 78 which is the inner cavity of the syringe 14.

[0040] The gasket 70 is disposed in the barrel inner cavity 74. The pusher 72 is connected to the gasket 70. The pusher 72 extends in the base end direction from the gasket 70. The base end side of the pusher 72 protrudes in the base end direction from the base end opening of the barrel body 66.

[0041] The nozzle 68 is fitted into the tapered portion 64. By fitting the nozzle 68 and the tapered portion 64, the catheter assembly 12 including the needle member 10 and the syringe 14 are coaxially connected along the axis 26. In the initial state of the catheter assembly 12, a filter cap (not shown) is attached to the base end portion of the hub body 46. The filter cap closes the base end opening 60 of the hub body 46. The filter cap allows the passage of air and blocks the passage of blood 18. After removing the filter cap from the hub body 46, the hub body 46 and the syringe 14 can be connected.

[0042] The operation assisting member 24 assists the operation of the user 79 for moving the gasket 70 disposed in the barrel inner cavity 74 when the nozzle 68 is fitted into the tapered portion 64. The constituent material of the operation assisting member 24 is a resin material such as polypropylene or polycarbonate. The operation assisting member 24 has a shaft 80, an operation portion 82, an acting portion 84, and an opening 87. The shaft 80, the operation portion 82, and the acting portion 84 are integrally formed.

[0043] The shaft 80 is a cylindrical member extending along the axial direction. The shaft 80 has a shaft inner cavity 88 extending along the axial direction. At least a part of the shaft 80 is inserted into the hub inner cavity 52. FIG. 2 shows a case where the distal end side of the shaft 80 is inserted into the hub inner cavity 52 and the proximal end side of the shaft 80 protrudes from the hub body 46 in the proximal end direction. In FIG. 2, the proximal end portion of the shaft 80 is located in the barrel inner cavity 74.

[0044] The proximal end portion of the inner needle 36 is inserted into the shaft inner cavity 88 from the distal end portion of the shaft 80. Therefore, the shaft inner cavity 88 has a diameter that allows the inner needle 36 to be inserted. As shown in FIG. 2, the proximal end portion of the inner needle 36 is located in the proximal end direction relative to a seal portion 100 described later and in the distal end direction relative to the proximal end opening 60. When the nozzle 68 and the tapered portion 64 are fitted together, the proximal end side of the shaft 80 is inserted into the syringe inner cavity 78. FIG. 2 shows a case where the proximal end side of the shaft 80 is inserted into the nozzle inner cavity 76 and the barrel inner cavity 74. Therefore, the shaft 80 is arranged coaxially with the axis 26. The shaft 80 has an outer diameter that allows it to be displaced relative to the nozzle 68 along the axis 26. A slight gap is provided between the outer peripheral surface of the shaft 80 and the inner surface of the nozzle 68.

[0045] As shown in FIG. 2, the operation portion 82 is connected to the shaft 80. The operation portion 82 is a lever that can be operated by the user 79. Specifically, the operation portion 82 has a connecting portion 90 and an operating element 92. The connecting portion 90 extends in the radial direction of the shaft 80 from the distal end portion of the shaft 80. The connecting portion 90 is exposed to the outside of the hub body 46 through the notch 62. The operating element 92 is connected to the distal end portion of the connecting portion 90 exposed to the outside of the hub body 46. The operating element 92 extends in the proximal end direction from the distal end portion of the connecting portion 90.

[0046] User 79 axially moves the shaft 80 connected to the connecting portion 90 by axially operating the operating element 92 along the notch 62. That is, the length of the notch 62 in the axial direction becomes the movable range of the operating portion 82 and also becomes the moving length of the shaft 80 in the axial direction. The operating portion 82 is axially movable between the tip position shown in FIG. 2 and the base end position shown in FIG. 4. The tip position is the position of the operating portion 82 in the axial direction when the connecting portion 90 is located at the tip of the notch 62. The base end position is the position of the operating portion 82 in the axial direction when the connecting portion 90 is located at the base end of the notch 62. User 79 axially moves the shaft 80 by axially moving the operating element 92 using the finger 94 of the hand holding the needle hub 38 while holding the needle hub 38 with one hand.

[0047] Note that irregularities, grooves, etc. may be formed on the surface of the operating element 92 (the surface radially separated from the shaft 80) operated by the user 79. Thereby, the user 79 can easily operate the operating element 92 in the axial direction. Further, the inner needle 36 is inserted into the shaft 80 so that the inner needle 36 does not come out of the shaft 80 when the operating portion 82 moves axially. Specifically, as shown in FIG. 4, the base end portion of the inner needle 36 is located more toward the base end than the position of the tip end portion of the shaft 80 at the base end position of the operating portion 82.

[0048] As shown in FIG. 2, the acting portion 84 is provided at the base end portion of the shaft 80. When the operating portion 82 is located at the tip position, the acting portion 84 is retracted to the retracted position shown in FIG. 2. When the user 79 operates the operating portion 82 from the tip position toward the base end direction, the shaft 80 moves in the base end direction, and the acting portion 84 is displaced from the retracted position toward the base end direction. The acting portion 84 presses the gasket 70 in the base end direction by being displaced in the base end direction.

[0049] The acting portion 84 has a flat surface portion 96. The flat surface portion 96 is the base end face of the shaft 80. As shown in FIGS. 2 and 3B, the flat surface portion 96 is, for example, a semi-circular flat surface orthogonal to the axis 26. The flat surface portion 96 is in surface contact with the tip end face 98 of the gasket 70. The flat surface portion 96 has an area such that the gasket 70 can be displaced in the base end direction by a pressing force in the base end direction.

[0050] In addition, in order to displace the shaft 80 axially in the nozzle inner cavity 76, the diameter of the flat surface portion 96 needs to be less than or equal to the outer diameter of the shaft 80. Also, it is necessary to provide the flat surface portion 96 so as not to interfere with the opening 87 formed on the base end side of the shaft 80. Furthermore, the flat surface portion 96 needs to have an area such that the gasket 70 can be displaced in the base end direction. Therefore, by forming the flat surface portion 96 in a semi-circular shape, the area of the flat surface portion 96 necessary for displacing the gasket 70 in the base end direction is ensured.

[0051] The opening 87 is an opening formed on the base end side of the shaft 80 and communicating with the shaft inner cavity 88. A notch groove 86 is formed at the base end portion of the shaft 80 so as to avoid the acting portion 84. The notch groove 86 is provided by cutting out a side wall portion of the base end portion of the shaft 80 that does not form the acting portion 84. As shown in FIG. 3B, the notch groove 86 is, for example, a semi-circular groove. As shown in FIGS. 2 and 3B, the opening 87 is a portion of the notch groove 86 that communicates with the shaft inner cavity 88. Therefore, the opening 87 is provided at the base end portion of the shaft 80 so as to avoid the acting portion 84. The opening 87 communicates with the barrel inner cavity 74 when the nozzle 68 and the tapered portion 64 are fitted together. As shown in FIGS. 3A and 3B, the opening area of the opening 87 is larger than the cross-sectional area of the needle inner cavity 42.

[0052] As shown in Fig. 2, in the hub lumen 52, a seal portion 100 is provided between the nozzle 68 and the notch 62. The seal portion 100 is a ring-shaped member. The shaft 80 passes through the seal portion 100. The seal portion 100 seals between the outer peripheral surface of the shaft 80 and the inner surface 54 of the hub body 46. The shaft 80 is axially displaceable with respect to the seal portion 100 and the inner needle 36 when the user 79 axially operates the operation portion 82.

[0053] In the hub lumen 52, a restricting portion 102 is provided between the seal portion 100 and the notch 62. The restricting portion 102 restricts the movement of the seal portion 100 in the tip direction. Specifically, the restricting portion 102 is a convex portion 104 formed on the inner surface 54 of the hub body 46. When the nozzle 68 and the tapered portion 64 are fitted together, the seal portion 100 is positioned between the convex portion 104 (restricting portion 102) and the nozzle 68. The nozzle 68 restricts the movement of the seal portion 100 in the base end direction. Therefore, the seal portion 100 is restricted from moving axially by the convex portion 104 (restricting portion 102) and the nozzle 68.

[0054] Next, a blood sampling method for the patient 16 using the catheter assembly 12 (see Fig. 1) will be described.

[0055] First, as shown in Fig. 2, with the operation portion 82 positioned at the tip position, the acting portion 84 positioned at the retracted position, and the gasket 70 disposed on the tip side of the barrel lumen 74, the user 79 inserts the nozzle 68 of the syringe 14 into the tapered portion 64 of the needle member 10. Thereby, the base end side of the shaft 80 is inserted into the syringe lumen 78, the nozzle 68 and the tapered portion 64 are fitted together, and the needle member 10 and the syringe 14 are coaxially connected. Also, the seal portion 100 is axially restricted by the convex portion 104 and the nozzle 68.

[0056] Next, as shown in Fig. 1, with the user 79 holding the needle hub 38 with one hand, the user punctures the inner needle 36 of the catheter assembly 12 into the blood vessel 34 of the patient 16. Thereby, the blood vessel 34 is secured, and blood 18 flows back from the blood vessel 34 through the needle lumen 42 into the shaft lumen 88 (see Fig. 2).

[0057] Next, as shown in FIG. 2, the user 79 places the fingers 94 of one hand on the operating member 92 and moves the operating member 92 from the tip position toward the proximal end. As a result, the operation assisting member 24 is displaced in the proximal end direction with respect to the inner needle 36, the seal portion 100, and the nozzle 68, and the flat portion 96 presses the gasket 70 in the proximal end direction, so that the gasket 70 is displaced in the proximal end direction. As the gasket 70 is displaced in the proximal end direction, in the syringe lumen 78, the volume of the portion in the distal end direction from the gasket 70 increases, and negative pressure is generated. Due to the generation of negative pressure, as shown in FIG. 4, the blood 18 is sucked into the syringe lumen 78 through the shaft lumen 88 and the opening 87.

[0058] In addition, in the present embodiment, the operation portion 82 is not limited to being provided at the tip of the shaft 80. As long as the acting portion 84 can press the gasket 70 in the proximal end direction as the operation assisting member 24 moves in the axial direction, the operation portion 82 may be provided between the tip and the base end of the shaft 80.

[0059] Further, the operation portion 82 is not limited to the L-shaped cross-sectional shape shown in FIGS. 2 and 4. A portion of the connecting portion 90 that is exposed outside the hub body 46 from the notch 62 may be the operating member 92.

[0060] When the user 79 operates the operation portion 82 in the proximal end direction, as long as the acting portion 84 can press the gasket 70 in the proximal end direction, the retracted position of the acting portion 84 may be a position away from the gasket 70 in the distal end direction. For example, the retracted position of the acting portion 84 may be a position away from the gasket 70 in the distal end direction in the barrel lumen 74. Alternatively, the retracted position of the acting portion 84 may be a position away from the gasket 70 in the distal end direction in the nozzle lumen 76.

[0061] In FIG. 2, the front end surface 98 of the gasket 70 is located slightly away from the front end portion of the barrel body 66 in the proximal direction. When the gasket 70 is not pressed by the acting portion 84, the front end surface 98 of the gasket 70 may be in surface contact with the front end portion of the barrel body 66.

[0062] The opening 87 is not limited to being located in the barrel lumen 74 when the nozzle 68 and the tapered portion 64 are fitted together and the operation assisting member 24 is located at the front end position in FIG. 2. The opening 87 may be located in the nozzle lumen 76 when the nozzle 68 and the tapered portion 64 are fitted together and the operation assisting member 24 is located at the front end position in FIG. 2. Even in this case, blood 18 can be aspirated into the syringe lumen 78 through the opening 87.

[0063] The restricting portion 102 is not limited to the convex portion 104 formed on the inner surface 54 of the hub body 46. An annular groove may be formed in the circumferential direction on the inner surface 54 of the hub body 46, and the sealing portion 100 may be fitted into the annular groove. Thereby, it functions as a restricting portion 102 that restricts the movement of the sealing portion 100 in the axial direction including the front end direction.

[0064] In the tapered portion 64, other convex portions may be formed on the proximal side of the sealing portion 100. Thereby, the movement of the sealing portion 100 in the proximal direction can be restricted by the other convex portions.

[0065] This embodiment has the following effects.

[0066] As shown in FIG. 2, when the nozzle 68 at the tip of the syringe 14 is fitted into the tapered portion 64 which is the syringe fitting portion 50, and the tip of the inner needle 36 is punctured into the blood vessel 34 (see FIG. 1), if the user 79 displaces the operation portion 82 in the proximal direction with the hand holding the hub body 46, the shaft 80 moves in the proximal direction together with the operation portion 82. When the shaft 80 moves in the proximal direction, the acting portion 84 presses the gasket 70, and the gasket 70 moves in the proximal direction by the pressing force from the acting portion 84. As a result, a negative pressure is generated in the portion of the syringe lumen 78 that is more distal than the gasket 70, and the blood 18 in the blood vessel 34 is sucked into the syringe lumen 78 through the needle lumen 42, the shaft lumen 88, and the opening 87 (see FIG. 4). Therefore, according to the present embodiment, since it is possible to perform the suction operation of the blood 18 with the hand holding the hub body 46, the procedure of the user 79 can be simplified.

[0067] Since the length of the notch 62 in the axial direction is the movable range of the operation portion 82, the user 79 can move the shaft 80 and the acting portion 84 in the axial direction within the movable range of the operation portion 82 by operating the operation portion 82 exposed from the notch 62 in the axial direction. Also, the user 79 can easily operate the operation portion 82 while holding the hub body 46 with one hand.

[0068] By using the seal portion 100, it is possible to prevent the blood 18 sucked into the syringe lumen 78 from leaking outside the hub body 46 through the notch 62 from the gap between the shaft 80 and the nozzle 68. Also, it is possible to prevent air from entering the syringe lumen 78 through the gap between the shaft 80 and the nozzle 68 from the notch 62.

[0069] By using the restricting portion 102, it is possible to restrict the movement of the seal portion 100 in the distal direction. Also, when the nozzle 68 is fitted into the syringe fitting portion 50, it is possible to prevent the seal portion 100 from coming off the hub body 46.

[0070] Since the regulating part 102 is the convex part 104 formed on the inner surface 54 of the hub body 46, the movement of the seal part 100 in the tip direction can be effectively regulated. Further, when the nozzle 68 is fitted to the syringe fitting part 50, the seal part 100 can be effectively prevented from coming off from the hub body 46.

[0071] As shown in FIGS. 3A and 3B, since the opening area of the opening 87 is larger than the cross-sectional area of the needle lumen 42 of the inner needle 36, the blood 18 can be easily sucked from the needle lumen 42 into the syringe lumen 78 (see FIG. 4) through the shaft lumen 88 and the opening 87.

[0072] As shown in FIG. 2, since the acting part 84 has the flat part 96 that can be in surface contact with the gasket 70, the gasket 70 can be effectively pressed in the proximal direction.

[0073] Note that the present invention is not limited to the above-described disclosure, and various configurations can be adopted without departing from the gist of the present invention.

Explanation of Reference Numerals

[0074] 10... needle member 14... syringe 18... blood (liquid) 24... operation assisting member 36... inner needle (needle body) 38... needle hub 42... needle lumen 46... hub body 48... needle holding part 50... syringe fitting part 52... hub lumen 68... nozzle (tip part of syringe) 70... gasket 78... syringe lumen 80... shaft 82... operation part 84... acting part 87... opening 88... shaft lumen

Claims

1. A needle body having a needle lumen, a cylindrical hub body having a hub lumen, a needle holding portion provided on the distal end side of the hub body for holding the proximal end side of the needle body, and a syringe fitting portion provided on the proximal end side of the hub body into which the distal end portion of a syringe having a syringe lumen can be fitted, a needle hub; an operation assisting member for assisting a user operation for moving a gasket disposed in the syringe lumen when the distal end portion of the syringe is fitted into the syringe fitting portion; comprising: the operation assisting member includes a cylindrical shaft having at least a part inserted into the hub lumen and having a shaft lumen into which the proximal end portion of the needle body is inserted, an operation portion connected to the shaft and exposed outside the hub body, an acting portion provided at the proximal end portion of the shaft, and an opening provided in the shaft for allowing a liquid to flow out of the shaft lumen; when the distal end portion of the syringe is fitted into the syringe fitting portion, the shaft is inserted into the distal end portion of the syringe, and the opening communicates with the syringe lumen; a needle member, wherein as the operation portion is displaced in the proximal end direction of the needle hub by the user operation, the shaft moves in the proximal end direction, and the acting portion presses the gasket in the proximal end direction.

2. The needle member according to claim 1, wherein a notch is formed in the hub body along the axial direction of the shaft; the operation portion is exposed outside the hub body through the notch.

3. The needle member according to claim 2, wherein a seal portion is further provided between the distal end portion of the syringe and the notch in the hub lumen for sealing between the outer peripheral surface of the shaft and the inner peripheral surface of the hub body; the shaft is axially slidable with respect to the seal portion.

4. The needle member according to claim 3, wherein a restricting portion is further provided between the seal portion and the notch in the hub lumen for restricting movement of the seal portion in the distal end direction of the needle hub; when the distal end portion of the syringe is fitted into the syringe fitting portion, the seal portion is located between the restricting portion and the distal end portion of the syringe.

5. The needle member according to claim 4, wherein the restricting portion is a convex portion formed on the inner peripheral surface of the hub body.

6. In the needle member according to any one of claims 1 to 5, the opening area of the opening is larger than the cross-sectional area of the needle lumen, the needle member. **Claim 7** In the needle member according to any one of claims 1 to 5, the acting portion has a flat portion that can be in surface contact with the gasket, the needle member.

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