WO2007122959A1

WO2007122959A1 - Indwelling needle assembly

Info

Publication number: WO2007122959A1
Application number: PCT/JP2007/055892
Authority: WO
Inventors: Takato Murashita; Ryoji Kobayashi; Junichi Ogawa
Original assignee: Terumo Kabushiki Kaisha
Priority date: 2006-03-30
Filing date: 2007-03-22
Publication date: 2007-11-01
Also published as: JPWO2007122959A1; JP4970430B2

Abstract

Indwelling needle assembly (1) structured to puncture a living body surface in use, comprising inner needle (4) provided at its distal end with sharp needlepoint (41); inner needle hub (5) fixed at a proximal end of the inner needle (4); hollow outer needle (2) allowing insertion and through-passage of the inner needle (4); outer needle hub (3) fixed at a proximal end of the outer needle (2) and provided with connection part (34) for connection of tube (7); and seal means disposed in the internal space of the outer needle hub (3) and provided with seal member (8) having hole (81) allowing insertion and through-passage of the inner needle (4). The seal member (8) of the indwelling needle assembly (1) consists of a swellable material swelling in water at a swelling ratio of 2 to 50. When the inner needle (4) is pulled off from the seal member (8), the seal member (8) is brought into contact with a body fluid stuck to the inner needle (4) and thus swells and expands to thereby close the hole (81).

Description

Specification

Indwelling needle assembly

Technical field

[0001] The present invention relates to an indwelling needle assembly that punctures and indwells a blood vessel, for example, during infusion.

Background art

[0002] When an infusion is performed on a patient, an indwelling needle connected to an infusion line is punctured into a patient's blood vessel, and placed in place.

[0003] Such an indwelling needle includes a hollow outer needle, an outer needle hub fixed to the proximal end of the outer needle, an inner needle inserted into the outer needle and having a sharp needle tip at the distal end, It is composed of an inner needle and a needle fixed to the proximal end of the needle (see, for example, Patent Document 1).

[0004] When this indwelling needle is punctured into a patient's blood vessel, the puncture operation is performed in an assembled state in which the inner needle is inserted into the outer needle and the needle tip of the inner needle protrudes from the tip of the outer needle. In this assembled state,

The infusion line connector is connected to the outer needle hub.

[0005] When the needle tip of the inner needle reaches the inside of the blood vessel, the blood that has flowed from the opening of the needle tip passes through the lumen of the inner needle and flows into the inside of the transparent inner needle needle (flashback). ). This confirms (visually confirms) that the inner needle has secured the blood vessel.

When this flashback is confirmed, the outer needle is advanced and the outer needle is inserted into the blood vessel.

[0006] Next, the inner needle is removed from the outer needle while holding the outer needle by hand. Then, the infusion is administered through the connected infusion line and the outer needle.

[0007] Now, the outer needle hub is provided (fixed) with a seal member (plug). This seal member can be punctured by the inner needle, and has a self-occlusion property when the punctured inner needle is removed.

[0008] However, in the indwelling needle having such a sealing member, when the state in which the inner needle is punctured into the sealing member (assembled state) is maintained for a long period of time, the inner needle is removed from the sealing member. When the seal is removed, there is a possibility that the seal member will be clogged with the inner needle, that is, the hole due to the inner needle generated in the seal member may not be blocked. For this reason, the sealing performance (sealing function) of the sealing member when the inner needle is removed from the sealing member is lowered, and blood is discharged from the hole. There was a problem that liquids such as chemicals and chemicals could leak out.

Patent Document 1: Japanese Patent Laid-Open No. 10-179734

Disclosure of the invention

An object of the present invention is to provide an indwelling needle assembly in which a hole of a seal member is reliably closed when an inner needle is removed from the seal member.

[0011] To achieve the above object, the present invention provides:

An inner needle having a sharp needle tip at the tip;

An inner needle hub fixed to the proximal end of the inner needle;

A hollow outer needle through which the inner needle is inserted;

An outer needle hub that is fixed to a base end portion of the outer needle and has a connecting portion to which a tube is connected, and a seal that has a seal member that is provided in the inner space of the outer needle hub and has a hole through which the inner needle can be inserted. And an indwelling needle assembly that is used by puncturing the surface of a living body.

The seal member is made of a swellable material having water swellability and a swelling rate of 2 to 50 times.

The sealing member force When the inner needle is removed, the sealing member comes into contact with body fluid adhering to the inner needle, so that the sealing member swells and expands, and the hole is closed. An indwelling needle assembly.

[0012] According to the present invention, when the inner needle is removed from the seal member, the hole of the seal member is reliably closed.

[0013] In the indwelling needle assembly of the present invention, it is preferable that the swellable material mainly comprises at least one of a maleic anhydride polymer and an acrylic polymer.

[0014] Thereby, the set expansion rate can be satisfied, liquid leakage can be surely prevented, and safety against a living body can be ensured.

[0015] In the indwelling needle assembly of the present invention, it is preferable that the sealing member has a circular or elliptical cross-sectional shape. [0016] Thereby, the seal member can swell (expand) evenly in the radial direction thereof, and thus the hole is more reliably closed.

[0017] In the indwelling needle assembly of the present invention, it is preferable that the outer needle hub is provided with a buffer portion into which a part of the expanded seal member enters.

[0018] Thereby, it is possible to prevent the pores from being excessively blocked by the expanded sealing member itself.

. As a result, when the inner needle is removed from the seal member, it can be prevented that the inner needle is firmly tightened into the hole of the expanded seal member, and thus the indwelling needle assembly can be easily disassembled. Can do.

[0019] Further, in the indwelling needle assembly of the present invention, the sealing means is provided in an inner space of the outer needle hub, has a hole through which the inner needle can be passed, and is made of an elastic material. It is preferable to further have a second seal member.

[0020] Thereby, when the inner needle is removed from the seal member and the second seal member, the hole of the seal member is reliably closed by the expansion of the seal member, and the hole of the second seal member is It is surely occluded by self-occlusion. Accordingly, it is possible to more reliably prevent the liquid from leaking outside through the seal member and the second seal member. In addition, the sterility of the outer needle and the needle can be maintained.

[0021] In the indwelling needle assembly of the present invention, it is preferable that the seal member and the second seal member are arranged along the insertion direction of the inner needle.

[0022] Thereby, two holes with different closing conditions are alternately arranged. As a result, for example, the liquid adhering to the inner needle is insufficient, or the shape of the second seal member is not sufficiently restored due to excessive opening of the hole in the second seal member by the inner needle. Even in such a case, at least one of the sealing member and the second sealing member can be reliably closed.

[0023] In the indwelling needle assembly of the present invention, it is preferable that the outer peripheral surface of the seal member is in contact with an inner peripheral surface that defines an internal space of the outer needle hub.

Thereby, the outer diameter of the seal member is regulated. When the seal member comes into contact with the body fluid adhering to the inner needle, the seal member tries to expand in the longitudinal direction and the radial direction. However, since the outer diameter of the seal member is regulated, the seal member does not expand in the radial direction in the direction in which the hole expands. Instead, the hole expands in the closing direction. As a result, the diameter of the hole is reliably reduced, and thus the hole force is reliably closed.

[0025] In the indwelling needle assembly of the present invention, it is preferable that the buffer portion is located on the proximal end side of the seal member.

Thereby, the base end portion of the expanded seal member can enter.

In the indwelling needle assembly of the present invention, at least two of the second seal members are provided, and the seal member is interposed between the second seal members. Is preferred.

[0028] Thereby, two holes having different blocking conditions are alternately arranged. As a result, for example, the liquid adhering to the inner needle is insufficient, or the shape of the second seal member is not sufficiently restored due to excessive opening of the hole in the second seal member by the inner needle. Even in such a case, at least one of the sealing member and the second sealing member can be reliably closed.

[0029] In the indwelling needle assembly of the present invention, it is preferable that the seal member and the second seal member have the same or different lengths in the insertion direction of the inner needle.

[0030] Thereby, for example, when the length of the second seal member is set shorter than the length of the seal member, friction against the inner needle can be suppressed.

[0031] Further, in the indwelling needle assembly of the present invention, the inner needle has a portion with a large outer diameter and a portion with a small outer diameter,

In a state where the inner needle is inserted through the outer needle, it is preferable that the small portion is located in the hole of the seal member.

[0032] Thereby, it is possible to prevent or suppress the opening of the seal member from being caused by the inner needle, and thus it is possible to prevent the sealing function (sealability) of the seal member from being deteriorated.

In the indwelling needle assembly of the present invention, it is preferable that a tube is connected to the connection portion.

Thereby, liquids, such as a chemical | medical solution, can be supplied to an outer needle via a tube.

In the indwelling needle assembly of the present invention, the tube can be passed through the inner needle hub. Preferably there is.

[0033] This prevents the tube from interfering with the operation of the indwelling needle assembly.

Brief Description of Drawings

[0034] FIG. 1 is a perspective view showing a first embodiment of an indwelling needle assembly of the present invention.

FIG. 2 is a cross-sectional view taken along line A_A in FIG.

FIG. 3 is a cross-sectional view taken along line AA in FIG. 1.

FIG. 4 is a cross-sectional view taken along line AA in FIG.

FIG. 5 is a cross-sectional view taken along line AA in FIG. 1.

[FIG. 6] FIG. 6 is an enlarged view of region [B] in FIG.

FIG. 7 is an enlarged view of region [C] in FIG. 3.

8 is a perspective view corresponding to FIG. 5 of the indwelling needle assembly shown in FIG.

FIG. 9 is a perspective view showing a state where the tube is removed from the inner needle hub in the indwelling needle assembly shown in FIG. 1.

FIG. 10 is a longitudinal sectional view of the vicinity of the sealing means of the indwelling needle assembly (second embodiment) of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the indwelling assembly of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

[0036] <First embodiment>

FIG. 1 is a perspective view showing a first embodiment of the indwelling needle assembly of the present invention, FIGS. 2 to 5 are sectional views taken along line AA in FIG. 1, and FIG. FIG. 7 is an enlarged view of region [B] in FIG. 2, FIG. 7 is an enlarged view of region [C] in FIG. 3, and FIG. 8 is FIG. 5 of the indwelling needle assembly shown in FIG. FIG. 9 is a corresponding perspective view, and FIG. 9 is a perspective view showing the indwelling needle assembly shown in FIG. 1 with the tube removed from the inner needle knob.

In the following, the right side in FIGS. 1, 8, and 9 is referred to as the “base end”, the left side is referred to as the “tip”, and the upper side in FIGS. 2 to 7 is referred to as the “base end”. The lower side is described as the “tip”. Further, in FIGS. 2 to 7, the dropout prevention means of the indwelling needle assembly of the present invention is omitted. [0038] The indwelling needle assembly 1 shown in each figure is used by puncturing the surface of a living body. The indwelling needle assembly 1 includes a hollow outer needle 2, an outer needle knob 3 fixed to the proximal end of the outer needle 2, an inner needle 4 inserted into the outer needle 2, and an inner needle 4. A tube connected to the inner needle hub 5 fixed to the proximal end portion and the proximal end portion (or side portion) of the outer needle hub 3 so that the lumen 71 communicates with the lumen 21 of the outer needle 2. 7 and a sealing member (first sealing member) 8 as sealing means provided in the inside (internal space) 31 of the outer needle hub. Hereinafter, the configuration of each unit will be described.

[0039] As the outer needle 2, one having a certain degree of flexibility is preferably used. The constituent material of the outer needle 2 is preferably a resin material, in particular, a soft resin material. Specific examples thereof include fluorine resins such as PTFE, ETFE, and PFA, and olefin resins such as polyethylene and polypropylene, or These mixtures, polyurethanes, polyesters, polyamides, polyether nylon resins, mixtures of the olefin resins and ethylene vinyl acetate copolymers, and the like.

[0040] It is preferable that all or part of the outer needle 2 has internal visibility. That is, the outer needle 2 is preferably made of a transparent (colorless and transparent), colored transparent or translucent resin. Thereby, when the outer needle 2 secures the blood vessel, it is possible to visually confirm the flashback of the blood flowing from the distal end opening 22 of the outer needle 2.

[0041] In addition, the constituent material of the outer needle 2 may be mixed with an X-ray contrast agent such as barium sulfate, barium carbonate, bismuth carbonate, or tungstic acid so as to have a contrast function.

[0042] The outer needle hub 3 is liquid-tightly attached to the proximal end portion of the outer needle 2 by, for example, force squeeze, fusion (thermal fusion, high frequency fusion, etc.), adhesion with an adhesive, or the like. It is fixed (fixed).

The outer needle hub 3 is constituted by a substantially cylindrical member, and the inner side thereof, that is, the columnar inner 3 1 (hollow part) communicates with the lumen 21 of the outer needle 2 and is connected.

[0044] In FIG. 2 of this outer needle hub 3 (the same applies to FIGS. 3 to 5), one end is located on the right side wall portion.

A flow path 32 opened to the inside 31 of 3 is formed. The flow path 32 is substantially L-shaped, and the other end is opened by a recess 33 formed by recessing the outer needle and the base end of the tube 3, and an opening 321 is formed. Further, a ring-shaped convex portion (connecting portion) 34 is formed on the distal end surface (bottom surface) of the concave portion 33 so as to surround the opening 321 so as to protrude in the proximal direction. One end portion (tip portion) of the tube 7 is connected to the convex portion 34. As a result, the outer needle 2 (outer needle no. It is possible to supply liquids such as chemicals to 3).

[0045] Also, in FIG. 2 of the outer needle hub 3 (similarly in FIGS. 3 to 5), a pair of wings 6a and 6b as operating portions are integrally formed with the outer needle hub 3 on the left and right sides. Is formed. Each of the wings 6a and 6b has flexibility, and is configured to be openable and closable by bending or bending the vicinity of the joint portion of the wings 6a and 6b with respect to the outer needles and 3 of the blades.

[0046] When the outer needle 2 and the inner needle 4 are punctured into a blood vessel or the like, the wings 6a, 6b are closed with fingers, and the inner needle 4 and the outer needle 2 are moved along their longitudinal directions. A moving operation, that is, a puncturing operation can be performed. When the outer needle 2 is placed, the wings 6a and 6b are opened, and the wings 6a and 6b are fixed to the skin with an adhesive tape or the like.

[0047] An inner needle 4 having a sharp needle tip 41 at the tip is passed through the outer needle 2. In the indwelling needle assembly 1, the inner needle 4 is passed through the outer needle 2 and the seal member 8, and an inner needle knob 5 and an outer needle knob 3 described later are in contact with each other, that is, FIG. 1 and FIG. Used in the state shown in Figure 2. Hereinafter, this state is referred to as “assembled state”. The state in which the inner needle 4 is removed from the outer needle 2 and the seal member 8 is referred to as “disassembled state”.

[0048] The length of the inner needle 4 is such that at least the needle tip 41 protrudes from the distal end opening 22 of the outer needle 2 when the inner needle 4 is in the assembled state.

[0049] The inner needle 4 may be a hollow needle, but is preferably a solid needle. By using the inner needle 4 as a solid needle, sufficient strength can be ensured while reducing the outer diameter. In addition, by using the inner needle 4 as a solid needle, when the inner needle 4 is discarded after the operation is finished, there is no risk of blood remaining inside the inner needle 4 or the risk of the blood flowing out. high.

[0050] Further, when the inner needle 4 is a hollow needle, the blood flows into the hollow portion of the inner needle 4 when the inner needle 4 punctures a blood vessel, thereby confirming the flashback of the blood. By using 4 as a solid needle, blood flows into the gap between the inner needle 4 and the outer needle 2, so that blood flashback can be confirmed more quickly.

[0051] The inner needle 4 has a structure having both a hollow portion and a solid portion (for example, by filling a part of the lumen of the hollow needle, the distal end side is made hollow and the proximal end side is made hollow. However, the cost of the inner needle 4 can be reduced by constructing the whole with one member. [0052] Further, the inner needle 4 has a plurality (three in the present embodiment) of different outer diameters. That is, the inner needle 4 has a maximum outer diameter portion 4a having the largest outer diameter on the distal end side (tip portion), a minimum outer diameter portion 4c having the smallest outer diameter on the proximal end side, and a maximum outer diameter portion therebetween. An intermediate outer diameter portion 4b having an outer diameter between 4a and the minimum outer diameter portion 4c is provided.

[0053] Further, the inner needle 4 includes a first outer diameter changing portion 42 in which the outer diameter continuously changes at a boundary portion between the maximum outer diameter portion 4a and the intermediate outer diameter portion 4b, and an intermediate outer diameter portion. A second outer diameter changing portion 43 that continuously changes is formed between 4b and the minimum outer diameter portion 4c.

[0054] In each of the outer diameter changing portions 42 and 43, the outer diameter of the inner needle 4 may change stepwise, but by changing continuously (by forming a taper), the outer needle 2 When the inner needle 4 is withdrawn from the outer edge changing portion 42, 43, the tip edge portion of the hole 81 of the seal member 8 to be described later, the tip edge portion of the inner needle passage 911 of the protector 9 (the protector body 91), etc. Can be prevented, and the operation of removing the inner needle 4 from the outer needle 2 can be performed more smoothly and reliably.

[0055] It should be noted that each of the outer diameter changing portions 42 and 43 has a step that is inevitably formed when a groove 44 described later, which may be formed when the inner needle 4 is manufactured, is formed. It may be used.

[0056] Further, the maximum outer diameter portion 4a is set to have an outer diameter substantially equal to the inner diameter of the outer needle 2, and in close contact with the inner surface of the outer needle 2 with the inner needle 4 inserted through the outer needle 2. . A groove (flow path) 44 is formed to be recessed along the longitudinal direction of the inner needle 4 on the outer peripheral portion of the maximum outer diameter portion 4a (tip portion). With the groove 44, the distal end opening 22 of the outer needle 2 and the inside 31 of the outer needle hub 3 communicate with each other with the inner needle 4 inserted into the outer needle 2. The groove 44 functions as a blood (body fluid) flow path, for example, when a blood vessel is punctured. This ensures confirmation of blood flashback.

[0057] Examples of the constituent material of the inner needle 4 include metal materials such as stainless steel, aluminum, or an aluminum alloy, titanium, or a titanium alloy.

The inner needle 4 and the needle 5 are fixed (fixed) to the proximal end portion of the inner needle 4. The inner needle hub 5 is composed of a fixing portion 51 for fixing the inner needle 4 and a cover portion 52 provided on the outer peripheral side of the fixing portion 51. The fixing portion 51 and the cover portion 52 are preferably formed integrally.

[0059] In the assembled state, the tube 7 is disposed between the fixed portion 51 and the cover portion 52. . That is, the tube 7 is inserted through the inner needle knob 5 in the assembled state. This prevents the tube 7 from interfering with the operation of the indwelling needle assembly 1.

In addition, the cover portion 52 is provided with a pair of guides 523 and 523 force S for guiding the tube 7 (see FIG. 1). Each of these guides 523 constitutes the side wall (side part) of the cover 52, and the central axis O at the distal end of the tube 7 is the longitudinal direction of the inner needle No. 5 and the inner needle 5 (the central axis O of the outer needle 2). When

2 1 Guides to be almost parallel.

[0061] Further, when the inner needle 4 is removed from the outer needle 2, the tube 7 can be detached from the inner metal joint 10 and the hub 5 through the gap between the guides 523 (gap 521) (the eighth (See Figure and Figure 9).

[0062] Examples of the method of fixing the inner needle 4 to the inner needle No. 5 and the bush 5 (fixing portion 51) include a method such as fitting, force squeezing, fusing, adhesion using an adhesive, or a method using these in combination. It is done. In addition, when the inner needle 4 is hollow, for example, it is necessary to seal so that blood that flows backward when puncturing a blood vessel does not protrude from the proximal end of the inner needle 4.

Further, as shown in FIG. 1 (the same applies to FIGS. 2, 8 and 9), a flange 522 may be formed on the outer periphery of the tip of the inner needle knives 5. By providing the flange 522, for example, when the inner needle 4 is removed from the outer needle 2, this operation can be performed more easily and reliably by hooking a finger on the flange 522 and performing this operation.

[0064] Each of the inner needle knob 5 and the outer needle hub 3 described above is preferably made of a transparent (colorless transparent), colored transparent or translucent resin to ensure the internal visibility. The Thereby, when the outer needle 2 secures the blood vessel, it is possible to visually confirm the flashback of the blood flowing in through the groove 44 of the inner needle 4 described above. Further, if the inner needle 4 is solid, for example, all the blood flashed back by the pressure inside the blood vessel flows back through the groove 44, so that the visibility is better.

[0065] The constituent materials of the outer needle hub 3, the inner needle knob 5 and the blades 6a, 6b are not particularly limited, and are, for example, polyolefins such as polyethylene, polypropylene, and ethylene-butyl acetate copolymer, respectively. And various resin materials such as polyurethane, polyamide, polyester, polycarbonate, polybutadiene, and poly vinyl chloride.

[0066] The tube 7 has flexibility, and as described above, one end thereof is connected to the base end portion (convex portion 34) of the outer needle hub 3. The connector 72 is connected to the other end (base end) of the tube 7. It is installed. The connector 72 is connected to, for example, a connector attached to an end portion of an infusion line for supplying an infusion solution (medical solution) to be administered, a mouth portion (tip portion) of a syringe storing the medicinal solution, and the like.

[0067] The constituent material of the tube 7 is not particularly limited, and examples thereof include polyolefins such as polyethylene, polypropylene, and ethylene-butyl acetate copolymer, polyvinyl chloride, polybutadiene, polyamide, and polyester. Among these, it is particularly preferable to use polybutadiene. When polybutadiene is used as the constituent material of the tube 7, it is excellent in moderate flexibility, chemical resistance, and chemical adsorption prevention.

[0068] As shown in FIGS. 6 and 7 (the same applies to FIGS. 2 to 5), the indwelling needle assembly 1 is a seal member having an outer shape in the form of a column in the interior 31 of the outer needle hub 3. Has 8.

[0069] The cross-sectional shape of the seal member 8 is not particularly limited, and examples thereof include a circle, an ellipse, and a polygon (for example, a quadrangle and a hexagon). Among these shapes, in particular, a circle and an ellipse. Shape is preferred. In the present embodiment, the cross-sectional shape of the seal member 8 is a circle.

[0070] A hole 81 through which the inner needle 4 is inserted in the assembled state is formed in the seal member 8.

The hole 81 is circular in cross-sectional shape and penetrates along the longitudinal direction of the seal member 8. The inner diameter of the hole 81 is not particularly limited, but it is preferably, for example, substantially the same as or slightly smaller than the outer shape of the minimum outer diameter portion 4 c of the inner needle 4.

Further, as shown in FIGS. 2 and 6, in the assembled state, the minimum outer diameter portion 4c of the inner needle 4 is positioned in the hole 81. With such a configuration, it is possible to prevent or suppress the opening wrinkles due to the inner needle 4 on the seal member 8, and thus it is possible to prevent the sealing function (sealability) of the seal member 8 from being deteriorated. .

[0072] The hole 81 may be formed together with the seal member 8 when it is molded, or may be formed (processed) after the seal member 8 is formed.

[0073] The sealing member 8 having such a shape is made of a swellable material having water swellability. When the inner needle 4 is removed from the seal member 8, that is, when the indwelling needle assembly 3 is in a disassembled state, the seal member 8 is, for example, the second outer diameter from the maximum outer diameter portion 4a of the inner needle 4. Contact the blood (body fluid) that has adhered to the change part 43. As a result, the seal member 8 swells and expands, so that the hole 81 is reliably closed, and therefore, in a disassembled state, the seal member 8 is inserted through the hole 81 of the seal member 8 Thus, it is possible to reliably prevent, for example, liquid such as blood or chemical liquid from leaking out. Also

The sterility within the outer needle hub 3 (inner 31) can also be maintained.

[0074] The swelling material constituting the seal member 8 has a swelling ratio of 2 to 50 times. Here, “the swelling ratio is 2 to 50 times” means that the liquid (for example, water) is absorbed and the volume changes to 2 to 50 times. The swelling rate is more preferably 5 to 20 times.

[0075] If the swelling rate is less than the lower limit, liquid leakage may not be prevented. If the swelling rate exceeds the upper limit, the swelling expands more than necessary, and the seal member 8 becomes the outer needle. The hub 3 may be exposed or the flow path 32 may be blocked.

Therefore, by setting the swelling rate within the above range, there is an advantage that liquid leakage can be reliably prevented while maintaining a predetermined position and shape in the outer needle hub 3 and securing the flow path 32. is there.

[0077] The swellable material is not particularly limited, but it is preferably mainly composed of at least one of, for example, a maleic anhydride polymer and an acrylic polymer. By using such a material, there is an advantage that the set expansion rate can be satisfied, liquid leakage can be surely prevented, and safety to the living body can be secured.

Further, as shown in FIG. 6 (also in FIG. 7), the outer peripheral surface 82 of the seal member 8 is in contact with the inner peripheral surface 314 of the inside 31 of the outer needle hub 3. Thereby, the outer diameter of the seal member 8 is regulated.

[0079] When the seal member 8 comes into contact with blood (body fluid) adhering to the inner needle 4, it attempts to expand in the longitudinal direction and radial direction (the direction of arrow D and arrow E in Fig. 7).

However, as described above, since the outer diameter of the seal member 8 is restricted, the seal member 8 does not expand in the arrow D direction but expands in the arrow E direction. This ensures that the hole 81 is reduced in diameter.

Therefore, the hole 81 is more reliably closed.

As shown in FIG. 6, in the assembled state, a buffer portion (dead space) 315 located on the proximal end side of the seal member is formed in the inside 31 of the outer needle sleeve 3.

As shown in FIG. 7, the buffer portion 315 can receive the base end portion (part) of the seal member 8 expanded in the longitudinal direction (base end direction) in the disassembled state. As a result, the seal member 8 Swells and expands, and it is possible to prevent the holes 81 from being excessively blocked. As a result, when the inner needle 4 is removed from the seal member 8, the inner needle 4 can be prevented from being firmly tightened into the hole 81 of the expanded seal member 8, and thus the indwelling needle assembly can be prevented. 1 can be easily disassembled.

[0083] The volume of the buffer portion 315 in the assembled state is preferably 1 to 30%, more preferably 20 to 30% with respect to the seal member 8 (water swelling material) before swelling. I like it. By setting the volume of the buffer portion 315 within the above range, there is an advantage that a balance between the expansion in the radial direction and the expansion in the longitudinal direction can be achieved.

[0084] Further, as described above, when the cross-sectional shape of the seal member 8 is a circle or an ellipse, the seal member 8 can be uniformly swollen (expanded) in the radial direction. 81 closes more securely.

Further, as shown in FIG. 7, the expanded seal member 8 has stepped portions 311 and 312 whose distal end surfaces 83 and proximal end surfaces 84 are reduced in inner diameter of the inner portion 31, respectively. Press in the longitudinal direction. Thereby, there exists an advantage that it compresses reliably to radial direction.

[0086] The number of seal members 8 to be installed is not limited to one force in the illustrated configuration, and may be plural.

Furthermore, the indwelling needle assembly 1 has a protector 9 that covers at least the needle tip 41 of the inner needle 4 when the inner needle 4 is removed from the outer needle 2. The protector 9 will be described below.

[0088] As shown in Fig. 2 (the same applies to Figs. 3 to 5), the protector 9 includes a protector body 91 whose outer shape is substantially a rectangular parallelepiped, and shutter means 92 provided in the protector body 91. And.

[0089] An inner needle passage 911 force through which the inner needle 4 is threaded is formed substantially through the protector main body 91 along the longitudinal direction of the protector main body 91.

[0090] The cross-sectional shape of the inner needle passage 911 is substantially circular, and the inner diameter thereof is set to be equal to or slightly larger than the outer diameter of the maximum outer diameter portion 4a of the inner needle 4.

In addition, a recess 912 is formed in the inner wall (the surface facing the inner needle passage 911) on the distal end side of the protector body 91.

In this recess 912, shutter means 92 is accommodated. Shutter means 92 is A lock-like shutter member 921 and a coil panel (biasing means) 922 that urges the shutter member 921 toward the inner needle passage 911 are configured.

[0093] The shutter means 92 is in an assembled state, most of which is retracted into the recess 912, and has a first posture (the posture shown in FIG. 2) in which the inner needle 4 can pass through the inner needle passage 911. In the disassembled state, a part of the shutter member 921 enters the inner needle passage 911 and can be displaced to the second posture (the posture shown in FIG. 3) that blocks the passage of the needle tip 41 of the inner needle 4. ing.

[0094] According to the protector 9 as described above, the needle tip 41 of the inner needle 4 after use can be covered quickly and safely with a simple operation, and it is covered by the action of the shutter means 92. The needle tip 41 does not protrude from the tip of the protector 9 (protector body 91). For this reason, when the inner needle 4 etc. is disposed of, the accident that the operator etc. accidentally stabs a finger etc. with the needle tip 41 is prevented, and safety is high.

Further, in the assembled state, almost all of the protector 9 is covered with both the outer needle hub 3 and the inner needle hub 5. Thereby, when the outer needle 2 and the inner needle 4 are punctured, the protector 9 does not get in the way, so that the operation can be performed more reliably. The protector 9 is almost entirely covered with either the outer needle hub 3 or the inner needle hub 5.

Furthermore, the protector 9 is configured to be located on the proximal end side with respect to the seal member 8 in the assembled state. As a result, when the inner needle 4 is removed from the outer needle 2, it is not necessary to pass the protector 9 through the hole 81 of the seal member 8, so that the operation S can be performed more easily and reliably. In addition, with such a configuration, the entire length of the inner needle 4 can be set shorter, so that there is an advantage that the portion of the indwelling needle assembly 1 excluding the tube 7 can be downsized.

[0097] As shown in FIGS. 8 and 9, the indwelling needle assembly 1 is provided with a drop-off prevention device that prevents the protector 9 from dropping from the needle tip 41 when the protector 9 covers the needle tip 41. It has a connecting member 20 as a means.

This connecting member 20 is configured to connect the protector 9 and the inner needle hub 5. This reliably prevents the protector 9 from falling off the inner needle knob 5 (needle tip 41), and thus the state where the protector 9 covers the needle tip 41 can be reliably maintained. For this reason, the inner needle In the case of disposal of 4 etc., the accident that the operator accidentally stabs a finger etc. with the needle tip 41 is surely prevented, and safety is high.

[0099] Further, the connecting member 20 has an accordion shape, and is thus extendable. Such a connecting member 20 contracts in the assembled state, that is, is folded, and expands in a state where the inner needle 4 is removed from the outer needle 2 (the state shown in FIGS. 8 and 9 (disassembled state)). That is, it expands.

[0100] Thus, the connecting member 20 contracts in the assembled state, and is housed in the inner needle sleeve 5 in this contracted state. Thereby, the connecting member 20 does not get in the way during the puncturing operation, and the operability of the indwelling needle assembly 1 is improved. In addition, the indwelling needle assembly 1 can be reduced in size.

[0101] In addition, the inner needle 4 penetrates the connecting member 20 in a state where the connecting member 20 is contracted and extended. Thereby, the inner needle 4 functions as a guide for the connecting member 20 when the connecting member 20 expands and contracts. Therefore, for example, when the indwelling needle assembly 1 is in an assembled state (manufactured), it is ensured that the connecting member 20 contracts in an unintentional state, that is, contracts without being stored in the inner needle hub 5. Can be prevented.

[0102] Further, such an indwelling needle assembly 1 includes a fixing means for fixing the protector 9 to the outer needle knob 3 in the assembled state, and the protector 9 has at least the needle tip 41 of the inner needle 4. When the inner needle 4 and the protector 9 are engaged with each other in the covered state (disassembled state), the engagement means (movement restriction) that restricts the movement of the inner needle 4 relative to the protector 9 in the direction opposite to the needle tip 41. Means). Hereinafter, each of these fixing means and engaging means will be described in detail.

[0103] <Fixing means>

First, the fixing means will be described.

[0104] On the inner wall of the protector main body 91, a through hole 913 is formed on the base end side of the concave portion 912, and a convex portion 914 protruding inward is formed at the left end of the through hole 913 in FIG. It has been done.

[0105] A fixing pin 10 having a flange portion 11 at the right end in Fig. 2 is passed through the through hole 913 in a state where the coil panel 12 is housed. In this state, the coil panel 12 has its left end in contact with the convex portion 914 and its right end in contact with the flange portion 11 in FIG. Further, a through hole 35 into which the fixing pin 10 can be inserted is formed at the proximal end portion of the left side wall portion in FIG. 2 of the outer needle hub 3.

[0107] In a state where the inner needle 4 is inserted (penetrated) into the inner needle passage 911, the right surface of the fixing pin 10 contacts the outer peripheral surface of the inner needle 4, and the left end portion of the fixing pin 10 has a through hole 913. Protruding from the through hole

35 is inserted. As a result, the protector 9 is fixed to the outer needle hub 3 (first

(See Figure 2 and Figure 3).

On the other hand, when the inner needle 4 moves in the inner needle passage 911, the fixing pin 10 is pressed by the coil panel 12 and moves to the right in FIG. 4, and the left end portion of the fixing pin 10 passes through the through hole 35. Exit. As a result, the protector 9 is unlocked from the outer needle knob 3 (see FIG. 4).

Thus, in the present embodiment, a fixing means for fixing the protector 9 to the outer needle hub 3 is mainly configured by the through hole 913, the fixing pin 10, the coil spring 12 and the inner needle 4. ing.

Also, as shown in FIG. 3, in this embodiment, the fixing means is activated after the shutter means 92 is activated. That is, the fixing of the protector 9 to the outer needle hub 3 by the fixing means is maintained while the shutter means 92 is activated. With such a configuration, when the protector 9 is not fixed to the outer needle knob 3, the shutter means 92 operates reliably. The ability to more reliably prevent accidents in which a person or the like accidentally stabs a finger or the like with the needle tip 41.

[0111] <engaging means>

Next, the engaging means will be described.

[0112] A diameter-reduced portion 915 formed by reducing the diameter of the inner needle passage 911 is formed at the proximal end portion of the protector body 91. The inner diameter of the reduced diameter portion 915 is set smaller than the outer diameter of the maximum outer diameter portion 4a which is larger than the outer diameter of the intermediate outer diameter portion 4b and the minimum outer diameter portion 4c of the inner needle 4.

[0113] Thus, when the inner needle 4 is removed from the outer needle 2, the minimum outer diameter portion 4c, the second outer diameter changing portion 43, and the intermediate outer diameter portion 4b can pass through the reduced diameter portion 915. The first outer diameter changing portion 42 cannot pass through the reduced diameter portion 915 and engages with the reduced diameter portion 915 (see FIG. 4).

That is, in the present embodiment, the inner needle 4 is formed by the first outer diameter changing portion 42 and the reduced diameter portion 915. And an engaging means for engaging the protector 9.

[0115] By providing such an engaging means, in a series of operations for removing the inner needle 4 from the outer needle 2, the inner needle 4 is engaged with the protector 9, and the protector 9 is removed from the outer needle hub 3. Since it can be detached (see Fig. 4 and Fig. 5), the operation is extremely simple. Further, the inner needle 4 is prevented from coming off from the protector 9 in a state where the needle tip 41 is covered.

[0116] The first outer diameter changing portion 42 and the reduced diameter portion 915 are formed on the inner needle 4 and the protector 9, respectively, so that the configuration is simple and the number of parts is not increased. Contributes to reducing the diameter.

[0117] In the indwelling needle assembly 1 as described above, as shown in Figs. 1 to 5, the tube 7 is connected to the proximal end portion of the outer needle knob 3, and in the assembled state, the outer needle 2 The central axis O of the tube 7 and the central axis O at the tip of the tube 7 are substantially parallel to each other. Ie

2

Therefore, the tube 7 protrudes in the proximal direction of the proximal end force of the outer needle 3 and 3.

Here, if the tube 7 protrudes to the side of the outer needle hub 3, the outer needle hub 3 is pulled sideways by the tube 7 when the outer needle 2 and the inner needle 4 are punctured. This can break the noise and make it difficult to operate.

[0119] Also, if the tube 7 protrudes above the outer needle hub 3, when the outer needle 2 is fixed to the patient when the outer needle 2 is placed in the patient's blood vessel or the like, the tube 7 There is a risk of bending (kinking).

[0120] Furthermore, if the tube 7 protrudes to the side or upward of the outer needle hub 3, after the outer needle 2 enters the blood vessel, the tube 7 is not pinched when the outer needle 2 is advanced into the blood vessel. In addition, it is necessary to grip the inner needle knob 5 through the tube 7, and the operation becomes complicated.

[0121] On the other hand, in this indwelling needle assembly 1, the tube 7 protrudes toward the proximal end of the outer needle hub 3 and is covered with the inner needles 5 and 5 as described above. Excellent operability without inconvenience.

Next, an example of how to use the indwelling needle assembly 1 (when puncturing a blood vessel) will be described in detail.

[0123] [1] The indwelling needle assembly 1 is set in an assembled state, and a connector previously attached to the end of the infusion line is connected to the connector 72 so that the infusion from the infusion line can be supplied. [0124] At this time, a predetermined location on the tube 7 or the infusion line is sandwiched by, for example, a clamp (an example of a channel opening / closing means), and the lumen is closed.

[2] Next, the occlusion of the tube 7 or the infusion line due to the clamp or the like is released, and the infusion from the infusion line is introduced into the outer metal juno 10 and 3 through the tube 7.

[0126] The infusion solution introduced into the outer needle hub 3 fills the space on the tip side from the seal member 8 inside the flow path 32 and the inside 31 of the outer needle hub 3, and is introduced into the lumen 21 of the outer needle 2. As a result, the lumen 21 of the outer needle 2 is primed by infusion. At this time, a part of the infusion flows out from the front end opening 22 of the outer needle 2. At this time, the outer peripheral surface of the inner needle 4 and the inner peripheral surface of the hole 81 are in close contact with each other, and the sealing function is substantially maintained.

[0127] [3] When priming is completed as described above, the tube 7 or the infusion line is closed again with a clamp or the like, and the blades 6a and 6b are picked and closed with fingers, and the blades 6a and 6b are gripped. As the unit (operation unit), the integrated outer needle 2 and inner needle 4 are punctured into the blood vessel (vein or artery) of the patient.

[0128] As described above, by performing the puncture operation to the blood vessel by grasping the wings 6a and 6b, the puncture angle becomes smaller than when performing the puncture operation by directly grasping the outer needle hub 3, that is, The outer needle 2 and the inner needle 4 come closer to the blood vessel. Therefore, the puncture operation is easy and the burden on the patient's blood vessel is reduced.

[0129] When a blood vessel is secured by the outer needle 2, the inner pressure (blood pressure) of the blood vessel causes blood force S to flow backward through the lumen 21 of the outer needle 2 through the groove 44 of the inner needle 4, so that It is possible to check this at least one of the outer needle 2, outer needle hub 3, inner needle hub 5 or tube 7 having visibility.

[0130] After confirming this, the outer needle 2 and the inner needle 4 are further advanced toward the distal end by a minute distance.

[0131] Further, when such a blood vessel is punctured, the lumen 21 of the outer needle 2 is primed by infusion, so that it is reliably prevented that air bubbles intrude into the blood vessel, and safety is ensured. Is extremely high.

[0132] Further, as described above, in the indwelling needle assembly 1 of the present invention, the tube 7 is connected to the proximal end portion of the outer needle hub 3, and in the assembled state, the central axis O of the outer needle 2 and the tube 7 At the tip The central axis O is almost parallel. For this reason, the outer needle 2 and the inner needle 4

2

When puncturing, the tube 7 does not get in the way and is excellent in operability.

[0133] [4] When the blood vessel is secured by the outer needle 2, fix the outer needle 2 or the outer needle hub 3 with one hand and grasp the inner needle No. 5 with the other hand and move it toward the proximal direction. Pull and remove inner needle 4 from outer needle 2.

[0134] [5] Further, when the inner needle 4 moves in the proximal direction and the needle tip 41 passes through the hole 81, the seal member 8 swells and expands due to blood adhering to the inner needle 4. . As a result, the hole 81 is closed, so that liquid leakage through the hole 81 does not occur, and sterility of the outer needle hub 3 and the infusion line is ensured.

[0135] [6] Furthermore, when the inner needle 4 moves in the proximal direction and the needle tip 41 passes near the recess 912 of the inner needle passage 911, the shutter member 921 is moved to the inner needle passage 911 side by the pressing of the coil spring 922. The right surface of the shutter member 921 comes into contact with the surface facing the recess 912 of the inner needle passage 911. That is, the shutter means 92 changes from the first posture (see FIG. 2) to the second posture (see FIG. 3).

[0136] Thus, when the shutter means 92 is in the second posture, the shutter member 921 closes the inner needle passage 911. Therefore, even if the needle tip 41 tries to move back toward the distal end again, the needle tip 41 contacts the shutter member 921 and cannot return.

[0137] [7] Further, when the inner needle 4 moves in the proximal direction and the needle tip 41 passes near the through hole 913 of the inner needle passage 911, the fixing pin 10 is moved by the pressing of the coil panel 12 to the inner needle passage. It moves to the 911 side, and the right surface of the fixing pin 10 comes into contact with the surface facing the through hole 913 of the inner needle passage 911. At this time, the left end of the fixing pin 10 is detached from the through hole 35 of the outer needle 3 and 3. As a result, the protector 9 is unlocked from the outer needle knob 3 (see FIG. 4).

[0138] In this way, when the protector 9 is not fixed to the outer needle knob 3, the shirter means 92 operates reliably, so that when the inner needle 4 is discarded, the operator Accidents such as accidental puncture of fingers with the needle tip 41 can be prevented more reliably.

[0139] [8] Furthermore, when the inner needle 4 moves in the proximal direction, the first outer diameter changing portion 32 cannot pass through the reduced diameter portion 915 and engages with the reduced diameter portion 915 (the inner needle 4 Engages the protector 9).

[0140] In this state, when the inner needle No. 5 is further pulled in the proximal direction, the protector engaged with the inner needle 4 is pulled. The needle 9 is moved in the proximal direction together with the inner needle 4 and separated from the outer needle 3 and 3 (see FIGS. 5 and 8). At this time, the connecting member 20 prevents the protector 9 from being detached from the inner needle knob 5.

[0141] It should be noted that the center axis O of the outer needle 2 and the tube are also used in the series of operations [5] to [9].

1 The center axis on the tip side of 7 and the force are almost parallel by the guide 523 of the inner needle hub 5, so that these operations can be performed smoothly and reliably.

[0142] [9] Next, the tube 7 passed through the inner needle hub 5 is removed through the gap 521 (see FIG. 9).

[0143] After the inner needle 4 is removed from the outer needle 2 in this way, the inner needle 4 and the inner needle hub 5 become unnecessary, and are therefore disposed of.

[0144] The inner needle 4 has its needle tip 41 covered with the protector 9, and in particular, the needle tip 41 moves beyond the shutter means 92 to the tip side and protrudes from the tip of the protector 9. As a result, there is no accident that a person who disposes of the item accidentally stabs a finger or the like with the needle tip 41.

[10] Next, the wings 6a and 6b are opened and fixed to the skin with an adhesive tape or the like, and the blockage of the tube 7 or the infusion line by the clamp is released, and infusion supply is started.

[0146] The infusion supplied from the infusion line is injected into the patient's blood vessel through the lumens of the connector 72, the tube 7, the outer needle hub 3, and the outer needle 2. At this time, since the closed state of the hole 81 is maintained, liquid leakage through the hole 81 does not occur, and sterility of the outer needle hub 3 and the infusion line is ensured. The

[0147] <Second Embodiment>

[0148] Hereinafter, a second embodiment of the indwelling needle assembly of the present invention will be described with reference to this figure. However, the description will focus on differences from the above-described embodiment, and the description of similar matters will be omitted. The

This embodiment is the same as the first embodiment except that the configuration of the sealing means is different. [0149] The inside 31 of the outer needle hub 3 of the indwelling needle assembly 1A shown in FIG.

Two seal members 8 and two auxiliary seal members (second seal members) 30 adjacent to each seal member 8 are installed.

[0150] Since the seal member 8 is substantially the same as the seal member 8 of the first embodiment, the description thereof is omitted here.

The auxiliary seal member 30 has a circular cross section similar to the seal member 8.

[0152] The auxiliary seal member 30 is formed with a hole 301 through which the inner needle 4 passes in an assembled state. The hole 301 has a circular cross-sectional shape and penetrates along the longitudinal direction of the auxiliary seal member 30.

[0153] This hole 301 is self-occluding in its natural state. Here, the “natural state” means a state where no external force is applied to the auxiliary seal member 30.

[0154] The inner diameter of the hole 301 is not particularly limited. For example, it is preferable that the inner diameter of the inner needle 4 is approximately equal to or slightly smaller than the outer diameter of the minimum outer diameter portion 4c.

[0155] Further, the hole 301 may be formed together with the auxiliary seal member 30 when it is formed, or may be formed (processed) after the auxiliary seal member 30 is formed.

[0156] The auxiliary seal member 30 having such a shape is made of an elastic material.

The elastic material is not particularly limited, and for example, various rubber materials such as natural rubber, isoprene rubber, butyl rubber, butadiene rubber, styrene butadiene rubber, urethane rubber, nitrinole rubber, acrylic rubber, fluorine rubber, and silicone rubber. (Especially those vulcanized), various materials such as urethane-based, polyester-based, polyamide-based, olefin-based, styrene-based thermoplastic elastomers, or mixtures thereof. Among them, it is particularly preferable to use isoprene rubber. When isoprene rubber is used as the elastic material, there is an advantage that the expiration date of the product having a small compression set is extended.

[0157] In the indwelling needle assembly 1A having such a configuration, in the disassembled state, as described above, the hole 81 of the seal member 8 is reliably closed, and the hole 301 of the auxiliary seal member 30 is self-blocking. It is surely closed. Thereby, via the seal member 8 and the auxiliary seal member 30, for example, It is possible to more reliably prevent liquids such as blood and chemicals from leaking out. It is also possible to maintain sterility within the outer needle hub 3 (inner 31).

[0158] In addition, in the indwelling needle assembly 1A, since the sealing means further includes an auxiliary seal member 30 in addition to the seal member 8, leakage to the outside is prevented until the seal member 8 is sufficiently expanded. There is an advantage that can be.

Further, as shown in FIG. 10, the seal members 8 and the auxiliary seal members 30 are alternately arranged along the penetration direction of the inner needle 4. As a result, the holes 81 and 301 having different blocking conditions are alternately arranged. That is, the holes 81 closed by the swelling of the seal member 8 and the holes 301 closed by the restoration of the shape of the seal member 30 are alternately arranged.

Thereby, for example, when the blood adhering to the inner needle 4 is insufficient, or the shape of the seal member 30 is not sufficiently restored due to excessive opening of the hole 30 1 by the inner needle 4 Even if it is, it is possible to ensure that at least one of the seal member 8 and the auxiliary seal member 30 is closed.

[0161] Further, the seal member 8 and the auxiliary seal member 30 can be changed depending on the purpose of the force in which the length, that is, the thickness in the insertion direction of the inner needle 4 is the same. For example, when the auxiliary seal member 30 is thinned, the friction of the inner needle 4 can be reduced. On the other hand, when the auxiliary seal member 30 is thickened, the seal member 8 can be reduced (thinned).

[0162] The number of seal members 8 and auxiliary seal members 30 provided is two, but is not limited thereto, and may be one or three or more, for example.

[0163] Further, the number of the sealing members 8 and the auxiliary sealing members 30 may be the same or different. For example, the indwelling needle assembly 1A may have one seal member 8 and two auxiliary seal members 30. In this case, the seal member 8 may be disposed between the two auxiliary seal members 30.

[0164] While the indwelling needle assembly of the present invention has been described with respect to the illustrated embodiment, the present invention is not limited to this, and each part constituting the indwelling needle assembly performs the same function. It can be replaced with any possible configuration. Arbitrary components may be added.

[0165] Further, the indwelling needle assembly of the present invention is not limited to those used by being inserted into blood vessels, For example, it can be applied to those inserted into the abdominal cavity, thoracic cavity, lymphatic vessel, spinal canal, etc.

[0166] Further, the outer shape of each of the sealing member and the auxiliary sealing member is not limited to a columnar shape, and may be, for example, a thin plate shape, a sheet shape, or a rod shape.

[0167] Further, the seal member may be composed of, for example, a nonwoven fabric or a large number of particles.

[0168] Further, the holes of the seal member and the auxiliary seal member are not limited to those having a circular cross-sectional shape. For example, a single letter, a cross, Y, T (T-shaped) Shape), or even an H-shaped slit.

[0169] Further, the seal member and the auxiliary seal member may be installed on the outer needle knob via a housing (correcting member) for storing them.

[0170] In addition, after the outer needle force is removed from the inner needle, a cap attached to the proximal end portion of the outer needle knob may be provided. Thereby, it is possible to more reliably prevent liquid leakage from the proximal end of the outer needle hub. This cap may be formed integrally with the outer needle hub, or it may be a separate body from the outer needle hub. Also, the method of fixing the cap to the outer needle hub may be any method such as a friction method or a hook method.

[0171] Further, the protector is not limited to the configuration shown in the figure. For example, the protector is configured to be rotatable (displaceable) between a position covering at least the needle tip of the inner needle and a position separating the inner needle force. It may be.

[0172] The connector provided at the end of the tube is not particularly limited, and examples thereof include a needleless connector described in JP 2005-261931 A, a three-way stopcock, and the like.

[0173] Further, what is provided at the end of the tube is not limited to the above connector, and may be, for example, a cap or an air filter.

[0174] Further, the indwelling needle assembly of the present invention is configured so that these connectors, caps, and air filters can be appropriately replaced with the end portions of the tubes.

Industrial applicability The indwelling needle assembly of the present invention includes an inner needle having a sharp needle tip at a tip, an inner needle knob fixed to a proximal end portion of the inner needle, a hollow outer needle through which the inner needle is inserted, An outer needle knob fixed to the base end of the outer needle and having a connecting portion to which a tube is connected; and a seal provided in an inner space of the outer needle hub and through which the inner needle can be passed. An indwelling needle assembly that is used by puncturing the surface of a living body, wherein the seal member has a water swellability and a swelling ratio of 2 to 50 times. When the inner needle is removed, the seal member comes into contact with body fluid adhering to the inner needle, so that the seal member swells and expands, and the hole is formed. Block. For this reason, when the inner needle is removed from the seal member, the seal member comes into contact with the body fluid adhering to the inner needle, so that the seal member swells and expands. As a result, the hole of the seal member is reliably closed, and thus it is possible to reliably prevent liquid such as blood or chemical liquid from leaking through the hole of the seal member. Therefore, the indwelling needle assembly of the present invention has industrial applicability.

Claims

The scope of the claims

[1] an inner needle having a sharp needle tip,

An inner needle hub fixed to the proximal end of the inner needle;

A hollow outer needle through which the inner needle is threaded;

The sealing member force When the inner needle is removed, the sealing member comes into contact with body fluid adhering to the inner needle, so that the sealing member swells and expands, and the hole is closed. Indwelling needle assembly.

[2] The indwelling needle assembly according to claim 1, wherein the swellable material is mainly composed of at least one of a maleic anhydride polymer and an acrylic polymer.

[3] The indwelling needle assembly according to claim 1 or 2, wherein the seal member has a circular or oval cross-sectional shape.

[4] The indwelling assembly according to claim 1 or 2, wherein the outer needle hub is provided with a buffer portion into which a part of the expanded seal member enters.

[5] The seal means further includes a second seal member provided in an inner space of the outer needle knob, having a hole through which the inner needle can be passed, and made of an elastic material. The detainer assembly according to paragraph 1 or 2.

6. The indwelling needle assembly according to claim 5, wherein the seal member and the second seal member are arranged along a penetration direction of the inner needle.