JP2002119589A - Dwelling needle assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dwelling needle assembly to be easily produced, by which a medical staff member easily store an inner needle into a needle guard by one hand even when a long dwelling needle is used or when a medical staff member with a small hand use the assembly. SOLUTION: The dwelling needle assembly 1 is provided with an outer needle hub 3 where an outer needle 2 is fixed to its tip part, an inner needle hub 5 where the inner needle 4 is fixed to its tip part and the needle guard 6 for storing the inner needle 4 and the inner needle hub 5 inside. The assembly 1 is characterized in such a way that the needle guard 6 is provided with a multiplex structure consisting of pluralities of cylindrical bodies, the needle guard 6 and the inner needle hub 5 are respectively provided with magnets 81 and 82 so as to move the inner needle hub 5 in the needle guard 6 to the base end side by the repulsion force and to successively pull out the cylindrical bodies for extending the needle guard and, then, a locking means 7 is arranged, by which the inner needle hub 5 and the needle guard 6 are held against the repulsion force of the magnets.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indwelling needle assembly including an indwelling needle that is temporarily indwelled in a blood vessel for performing an infusion or the like. More specifically, the inner needle and the outer needle are simultaneously pierced into the living tissue, the inner needle is indwelled and the inner needle is removed from the outer needle, and then the inner needle is safely and easily stored in the needle guard. The present invention relates to an indwelling needle assembly that can be used.

[0002]

2. Description of the Related Art Indwelling needles used for infusions are usually
It has a double structure consisting of an outer needle and an inner needle. In use, a blood vessel is punctured with the inner needle inserted into the lumen of the outer needle. Next, after the outer needle is inserted to a predetermined position,
The inner needle is withdrawn from the inner cavity of the outer needle, and a transfusion line or the like is connected to the proximal end of the outer needle. The infusion or drug solution flows into the blood vessel through the inner lumen of the outer needle. Therefore,
The outer needle is generally made of a soft resin that is less likely to damage the inside of the blood vessel, and the inner needle is generally made of a metal that can easily puncture the blood vessel.

After the outer needle is placed in the body of a patient, the extracted inner needle is discarded. However, a medical worker or a patient accidentally touches the sharp needle tip and is injured. There are cases. Even if the needle tip is protected by an appropriate method, the inner needle used for a patient having a blood-borne disease such as hepatitis and acquired immunodeficiency syndrome (AIDS) is not limited to the needle tip itself. It can be a vehicle for transmission of the disease. For this reason, it is extremely important to properly dispose of the inner needle punctured by the patient, but in a medical setting, treatment of the patient is prioritized, and disposal of the inner needle is often postponed.

[0004] In recent years, an indwelling needle assembly for immediately and easily discarding a used inner needle has been proposed (Japanese Patent Laid-Open No. Hei 3 (1994)).
-63066, JP-A-6-78999, JP-A-6-86821, JP-A-7-328116, JP-A-11-57002, and the like. These indwelling needle assemblies include a tubular housing in which an inner needle hub connected to an inner needle is disposed, and a needle which is slidably disposed between the housing and the inner needle hub and has a distal end connected to a catheter. After the catheter of the indwelling needle assembly punctured in the patient is indwelled in the patient and the inner needle is removed, the needle guard is slid toward the distal end side of the housing, whereby the inner needle is inserted into the needle. It is stored in the guard.
Since these indwelling needle assemblies can easily protect the inner needle with one hand after removing the inner needle, they can be injured by the tip of the inner needle, or can be sick by blood adhered to the inner needle. There is no risk of infection.

However, these indwelling needle assemblies are
In each case, the needle guard that is longer than the length of the inner needle slides toward the distal end of the housing by the length of the inner needle.
It is difficult for a small medical worker to slide the needle guard with one hand to completely protect the inner needle. In addition, even if it is not a medical worker with small hands, when using a long indwelling needle that is to be placed in the groin femoral vein during emergency dialysis, the needle guard is slid with one hand to a position that completely protects the inner needle. It is difficult to move. The puncture needle described in Japanese Patent Application Laid-Open No. 7-328116 has a telescope structure in which a needle case body for accommodating an inner needle is composed of several short cylinders. When the indwelling needle is to be indwelled in a human body, The small shape makes it easy for a medical worker with a small hand to use. However, when protecting the inner needle extracted from the indwelling needle, it is necessary to slide the inner needle by the length of the inner needle toward the distal end of the housing.

On the other hand, in consideration of the above problems, a spring is provided between the inner needle hub and the base end of the needle guard, and when the push-button locking mechanism is released, the inner needle hub is actuated by the force of the spring. An indwelling needle assembly has been developed in which the needle can be operated to the base end of the needle guard (Japanese Patent Application Laid-Open Nos. 8-215315 and 9-103492). However, in the indwelling needle assembly provided with these push-button locking mechanisms, since a spring is used as the urging means of the inner needle, a manufacturing process for incorporating the spring into the indwelling needle assembly is complicated.

[0007]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention makes it easy for a medical worker to easily use an inner needle with one hand even when using a long indwelling needle or when using a medical worker with a small hand. Another object of the present invention is to provide an indwelling needle assembly that can be housed in a needle guard and that can be easily manufactured.

[0008]

Means for Solving the Problems The inventors of the present invention have made various studies to solve the above-mentioned problems, and as a result, the needle guard has a multiplex structure including a plurality of cylindrical bodies, and the inner needle hub has a plurality of needle guards. The present inventors have found that the above problem can be solved by retracting the needle into the cylindrical body, storing the inner needle in the needle guard extended and extracting the cylindrical body, and using a magnet as a means for extending the needle guard. The invention has been reached.

That is, the present invention has an outer needle hub having an outer needle pierced into and indwelled in a living tissue and fixed to the distal end portion, and a sharp cutting edge at the distal end portion which can be inserted into the lumen of the outer needle. An indwelling needle assembly having an inner needle hub having an inner needle fixed to a distal end thereof, and a needle guard capable of storing the inner needle and the inner needle hub therein, wherein the needle guard comprises a plurality of cylindrical bodies. The needle guard and the inner needle hub have magnets, respectively, and the inner needle hub moves to the base end side of the needle guard by the repulsive force between the magnets. The needle hub is provided so that the cylindrical body is sequentially pulled out and the needle guard is extended, and the indwelling needle assembly is provided with the inner needle hub against a repulsive force between the magnets. And a locking means capable of holding the needle guard is provided. Is a 置針 assembly.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The indwelling needle assembly according to the present invention will be described below in detail with reference to preferred embodiments shown in the accompanying drawings, but the present invention is not limited to these embodiments. FIG. 1 is a perspective view showing an indwelling needle assembly of the present invention,
FIG. 2 is a longitudinal sectional view showing one embodiment of the indwelling needle assembly before the inner needle is protected in the indwelling needle assembly of the present invention;
FIG. 3 is a cross-sectional view of a magnet provided on the outer surface of the needle guard of the indwelling needle assembly shown in FIG. FIG. 4 is a longitudinal sectional view showing one embodiment of the indwelling needle assembly after the inner needle is protected. FIG. 5 is a longitudinal sectional view showing another embodiment of the indwelling needle assembly before the inner needle is protected in the indwelling needle assembly of the present invention, and FIG. 6 is an indwelling needle assembly shown in FIG. It is a side view of one cylindrical body which forms the three-dimensional needle guard.

As shown in FIGS. 1 and 2, an indwelling needle assembly 1 according to the present invention can be inserted into an outer needle hub 3 having an outer needle 2 fixed to a distal end thereof, and a lumen of the outer needle 2. An inner needle hub 5 having an inner needle 4 having a sharp cutting edge 41 at the distal end thereof is fixed to the distal end, and a needle guard 6 capable of storing the inner needle 4 and the inner needle hub 5 therein. I have. In the indwelling needle assembly 1 of the present invention, the tip means the side (left side in the figure) to puncture the patient,
The proximal end refers to the opposite side (the right side in the figure) of the distal end.

The outer needle 2 is a hollow tube, and its distal end is preferably formed in a tapered shape whose outer diameter decreases toward the distal end in order to reduce piercing resistance. Since the outer needle 2 is left for a while after being inserted into the patient's body, it is preferable that the outer needle 2 is formed of a soft resin that is less likely to hurt the patient, and specifically, an ethylene-tetrafluoroethylene copolymer , Polyurethane, polyether, nylon resin and the like. The outer needle 2 is
The patient may be torn due to movement or the like while being placed in the patient's body. In such a case,
In order to detect the fragments of the outer needle 2, an X-ray contrast agent such as barium sulfate is blended into the material of the outer needle 2, and the outer needle 2
It is also possible to provide the camera with a contrast function.

An outer needle hub 3 is fixed to the proximal end of the outer needle 2. Examples of the fixing method include a method of fixing by caulking with a caulking pin, adhesion by an adhesive, fusion by heat, and the like. The outer needle hub 3 is a hollow tubular body, and is formed in a tapered shape whose inner diameter increases toward the base end. This ensures connection of the tubes and the like of the infusion set. Further, a projection 31 for connecting to a lock type luer taper portion provided in a syringe or a tube of an infusion set or the like may be provided at the base end of the outer needle hub 3. The material of the outer needle hub 3 is polyethylene, polypropylene, ethylene-
Hard resins such as polyolefin such as vinyl acetate copolymer, polyvinyl chloride, polybutadiene, polyamide and polyester are used.

The inner needle 4 is a hollow tube that can be inserted into the inner cavity of the outer needle 2, and its outer diameter is set slightly smaller than the inner diameter of the outer needle 2. Since the inner needle 4 has such an outer diameter, the outer needle 2 is held around the inner needle 4, and the outer needle 2 is held unless a force is applied from the outside.
There is no risk of falling off. Further, a sharp edge 41 is formed at the tip of the inner needle 4, and the edge 41 has an inclined blade surface to reduce piercing resistance. The inner needle 4 is punctured by a patient while being inserted into the outer needle 2, and when piercing the patient, the cutting edge 41 needs to protrude from the distal end side of the outer needle 2. The inner needle 4
The material is preferably not affected by a magnet described later, and examples thereof include metal materials such as stainless steel, aluminum, titanium, and alloys thereof.

An inner needle hub 5 is fixed to the proximal end of the inner needle 4. As the fixing method, as in the fixing method of the outer needle 2 and the outer needle hub 3, there are bonding by an adhesive, fusion by heat, and the like. As a material of the inner needle hub 5, a transparent or translucent hard material such as polycarbonate, acrylonitrile-butadiene-styrene copolymer, polystyrene, polyethylene, and polypropylene is preferably used. Thereby, when the inner needle 4 is punctured by the patient, the backflow of blood (hereinafter, referred to as flashback) can be confirmed. The inner needle hub 5 has a lumen 51 that communicates with the lumen of the inner needle 4, and the lumen 51 is connected via a filter 52 provided at a base end of the inner needle hub 5. Only the indwelling needle assembly 1 communicates with the outside. The filter 52 transmits air but does not transmit blood, and specifically, polypropylene, polystyrene,
A sintered filter made of a synthetic resin such as polymethyl methacrylate or a nonwoven fabric is preferably used. Therefore, when the inner needle 4 and the outer needle 2 are punctured into the blood vessel of the patient, the air in the inner needle 4 and the inner needle hub 5 is discharged to the outside of the indwelling needle assembly 1 through the filter 52 and flushed. Although the bag can be checked, the blood that has flowed into the inner needle 4 and the inner needle hub 5 by flashback is blocked by the filter 52 and does not leak to the outside.

The inner needle 4 and the inner needle hub 5 are housed in the needle guard 6 after being extracted from the inner cavity of the outer needle. The needle guard 6 has a multiplex structure including a plurality of cylinders. Before the inner needle 4 is housed, the cylinders overlap each other so that the overall length of the needle guard 6 is the shortest. At times, the cylinders are sequentially pulled out, and the entire length of the needle guard 6 is maximized. As the number of the cylinders increases, the overall length of the needle guard 6 before storing the inner needle 4 is short, and can be easily used by a medical staff. However, the number of parts increases and the manufacturing becomes difficult, and Costs are also high. Therefore, it is preferable that the needle guard 6 of the indwelling needle assembly 1 of the present invention has a double structure or a triple structure including two or three cylindrical bodies.

One embodiment of the indwelling needle assembly in which the needle guard has a double structure consisting of two cylinders is shown in FIGS.
This will be described with reference to FIG. As shown in FIG. 1, FIG. 2 or FIG. 4, the needle guard 6 has a double structure including two cylinders, an inner cylinder 61 and an outer cylinder 62. The outer diameter of the inner cylinder 61 is set slightly smaller than the inner diameter of the outer cylinder 62, and the inner cylinder 61 is slidable with respect to the outer cylinder 62. As the material of the inner cylinder 61 and the outer cylinder 62, a transparent or translucent hard material such as polycarbonate, acrylonitrile-butadiene-styrene copolymer, polystyrene, polyethylene, and polypropylene is preferably used.

The inner needle hub 5 is provided with a magnet 82, and the outer cylinder 62 having the largest diameter among the plurality of cylinders of the needle guard 6.
Are provided on the outer surface thereof, and are arranged so as to repel each other. Due to the repulsive force, the inner needle hub 5 moves to the base end side of the needle guard 6 while pulling out the cylindrical body and extending the needle guard 6, and the inner needle 4
Is stored in the needle guard 6. The position where the magnets 81 and 82 are provided is not particularly limited as long as the operation is not hindered.
Is preferably provided at the base end of the inner needle hub 5. On the other hand, when the magnet 81 provided on the outer surface of the outer cylinder 62 is held in a state before the inner needle 4 is housed in the needle guard 6, the magnet 81 provided on the outer cylinder 62 is held. Of the magnet 82 provided at the base end of the inner needle hub 5 in the inner needle axis direction.
It is preferable to be provided so as to be located on the distal end side than 21. When the center 811 of the magnet 81 is provided so as to be located closer to the base end than the center 821 of the magnet 82, the inner needle hub 5 is repelled by the magnets 81 and 82.
It is difficult to store the inner needle 4 in the needle guard 6 because the needle guard 6 is moved to the tip side of the needle guard 6. When the center 811 of the magnet 81 and the center 821 of the magnet 82 overlap each other, the repulsive force and the attractive force are balanced, so that the inner needle hub 5 can be moved toward the distal end or the proximal end. The inner needle 4 does not move, and it is also difficult to store the inner needle 4 in the needle guard 6.

The magnets 81 and 82 used in the present invention
Are neodymium magnets, cobalt magnets, ferrite magnets,
Alnico magnets, plastic magnets, rubber magnets, MA magnets, SmCo magnets and the like are preferably used. Further, in the present invention, the repulsive force of a magnet and a magnet refers to a force of repelling the magnets by bringing the same pole of a magnet having an S pole and an N pole close to each other, and the attraction force of the magnet and the magnet is Refers to the attraction of magnets by bringing the different poles closer together. The shape of the magnet 81 provided on the outer cylinder 62 is not limited. As shown in FIG. 3A, the magnet 81 has a donut-shaped cross section and is fixed on the outer cylinder 62 with an adhesive or the like. Alternatively, as shown in FIG. 3- (B) or FIG. 3- (C), it may be embedded and fixed in a part of the outer cylinder 62. On the other hand, the shape of the magnet 82 provided on the inner needle hub 5 is not limited, but is preferably a columnar material because the size is smaller than the magnet 81.

At the tip of the outer cylinder 62 of the needle guard 6,
A movable locking means 7 is provided. The locking means 7
The inner needle 4 is engaged with the inner needle hub 5 and the cylindrical body 61 so that the inner needle 4 is opposed to the repulsive force between the magnets 81 and 82 provided on the inner needle hub 5 and the outer cylinder 62. The inner needle hub 5 and the cylindrical body 61 can be held before being protected in the needle guard 6. As the locking means 7, for example, a latch member having a keyhole as shown in FIG. 2 or FIG. 4 is used. When the inner needle hub 5 is located at the distal end of the needle guard 6, the latch member 7 engages the inner needle hub 5 by a keyhole, and locks the inner needle hub 5 against the repulsive force of the magnets 81 and 82. Hold. On the other hand, the latch member 7
The inner cylinder 61 is engaged by a locking portion 71 extending to the base end side along the outer surface of the needle guard 6 to hold the needle guard 6 in a state in which the entire length is the shortest. After the medical worker places the outer needle 2 in the patient's body and then pushes down the latch member 7,
The latch member 7 is disengaged from the inner needle hub 5 and the inner cylinder 61, and the inner needle hub 5 is moved toward the base end of the inner cylinder 61 by the repulsive force between the magnets 81 and 82, and 61 is slid toward the base end of the outer cylinder 62 by being pushed by the inner needle hub 5. Therefore, the inner cylinder 61 protrudes inward from the proximal end of the inner cylinder 61 so as to be able to abut against the inner needle hub 5 that has moved toward the proximal end due to the repulsive force between the magnets 81 and 82. It is preferable that a protrusion is provided or the base end of the inner cylinder 61 is closed. At this time, the outwardly protruding projections 611 provided at the distal end of the inner cylinder 61 are urged inward by the inwardly protruding projections 621 provided at the proximal end of the outer cylinder 62. ,
When the needle guard 6 slides further to the proximal side and is engaged between the protrusions 621 and 622 provided at the proximal end of the outer cylinder 62, the total length of the needle guard 6 is maximized, and the inner needle 4 and the inner needle Hub 5 is protected within needle guard 6.

On the other hand, an embodiment of the indwelling needle assembly having a triple structure in which the needle guard has three cylinders will be described with reference to FIGS. 5 and 6. FIG. As shown in FIG. 5, the needle guard 6a has a triple structure including three cylinders 63, 64, and 65 whose outer diameters sequentially increase.
The outer diameter of the cylinder 63 is slightly smaller than the inner diameter of the cylinder 64,
The outer diameter of the cylindrical body 64 is set slightly smaller than the inner diameter of the cylindrical body 65, and each of them is slidable. The cylindrical body 63 having the minimum diameter of the needle guard 6a is provided with a protrusion protruding inward at the base end so as to be able to abut against the inner needle hub 5 as in the case of the needle guard 6 described above. Preferably the ends are closed. The cylinders 63, 64 and 6
The material of 5 is preferably the same as that of the needle guard 6.

A magnet 82 is provided on the inner needle hub 5 and a magnet 81 is provided on the outer surface of the cylindrical body 65 having the largest diameter among the plurality of cylindrical bodies of the needle guard 6a. Are located. Due to the repulsive force, the inner needle hub 5 moves toward the proximal end of the needle guard 6a while extending the needle guard 6a, and stores the inner needle 4 in the needle guard 6a. The positions where the magnets 81 and 82 are provided are as follows:
It is preferable that the magnet 82 provided in the inner needle hub 5 is provided at the base end of the inner needle hub 5, similarly to the needle guard 6. On the other hand, when the inner needle 4 is held before the inner needle 4 is housed in the needle guard 6a, the magnet 81 provided on the outer surface of the cylindrical body 65 is provided. It is preferable that the center 811 of the inner needle axial direction is provided so as to be located on the distal end side of the center 821 of the magnet 82 provided at the base end of the inner needle hub 5 in the axial direction of the inner needle. The materials and shapes of the magnets 81 and 82 are the same as those of the needle guard 6 described above.

At the tip of the cylindrical body 65 of the needle guard 6a, similarly to the needle guard 6, a locking means 7 such as a latch member is provided. The latch member 7 engages the inner needle hub 5 with a keyhole, holds the inner needle hub 5 against the repulsive force between the magnets 81 and 82, and the cylinder 63 and the cylinder 64 is engaged to hold the needle guard 6a in a state where its entire length is the shortest. When the medical worker depresses the latch member 7, the latch member 7, the inner needle hub 5, and the cylinder 63
Of the inner needle hub 5 and the cylinder body 64.
Moves toward the base end of the cylinder 63 by the repulsive force between the magnets 81 and 82, and the cylinder 63 is moved by the inner needle hub 5 into the cylinder 6.
4, and the cylinder 64 is slid toward the proximal end of the cylinder 65 by the inner needle hub 5 and the cylinder 63. The cylindrical body 64 has a groove 641 formed on a side surface as shown in FIG. 6, and when the cylindrical body 63 slides toward the base end side of the cylindrical body 64, the locking portion 71 of the latch member 7 The projection 631 at the tip of the cylindrical body 63 engaged
However, it does not prevent the cylindrical body 64 from moving to the proximal end side. A projection 6 provided at the tip of the cylindrical body 63
32 is fitted into a hole 642 provided at the base end of the cylindrical body 64, and a projection 643 provided at the distal end of the cylindrical body 64.
Are projections 651 and 6 provided at the base end of the cylinder 65.
When engaged between 52, the overall length of the needle guard 6a is maximized, and the inner needle 4 and inner needle hub 5 are protected within the needle guard 6a.

The cylindrical body 61 of the needle guard 6 or the cylindrical body 63 of the needle guard 6a has its base end moved toward the base end of the needle guard 6 by the repulsive force of the magnets 81 and 82. A holding plate 9 for holding the inner needle hub 5 at the base end of the needle guard 6 may be provided so that the needle hub 5 does not move to the distal end side of the needle guard 6 again. . The holding plate 9 is a plate made of a magnet or a magnetic material, and holds the inner needle hub 5 by a suction force between the holding plate 9 and a magnet 82 provided at the base end of the inner needle hub 5. The cylinder 61 or 63
When the holding plate 9 is a magnet when the base end is closed, the holding plate 9 holds the inner needle hub 5 even if the holding plate 9 is provided at the outer base end of the cylindrical body 61 or 63. Is possible.

[0025]

According to the indwelling needle assembly of the present invention, since the needle guard has a multi-layered structure composed of a plurality of cylinders, the shape at the time of puncturing the living tissue is compact, and the locking means is provided after puncturing. The inner needle can be stored inside the extended needle guard by simply pushing it down, so it can be used when a medical worker with a small hand punctures or when indwelling in the groin femoral vein during emergency dialysis. Even when puncturing a long indwelling needle to be used, the inner needle can be easily protected with one hand. Further, since a magnet is used instead of the conventional spring as a means for pulling the inner needle and the inner needle hub into the needle guard, the manufacturing does not become complicated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an indwelling needle assembly of the present invention.

FIG. 2 is a longitudinal sectional view of the indwelling needle assembly before the inner needle is protected in the indwelling needle assembly of the present invention.

FIG. 3 is a cross-sectional view of a magnet provided on a needle guard of the indwelling needle assembly.

FIG. 4 is a longitudinal sectional view of the indwelling needle assembly after the inner needle is protected in the indwelling needle assembly of the present invention.

FIG. 5 is a longitudinal sectional view of the indwelling needle assembly before the inner needle is protected in another indwelling needle assembly of the present invention.

6 is a side view of one cylindrical body forming the needle guard 6 of the indwelling needle assembly shown in FIG.

[Explanation of symbols]

 Reference Signs List 1 indwelling needle assembly 2 outer needle 3 outer needle hub 4 inner needle 41 cutting edge 5 inner needle hub 6 needle guard 7 locking means 81, 82 magnet 9 holding plate

Claims (6)

[Claims] 1. An outer needle hub having an outer needle pierced into and indwelling a living tissue and fixed to a distal end thereof, and an inner needle which can be inserted into a lumen of the outer needle and has a sharp cutting edge at the distal end. An indwelling needle assembly having an inner needle hub fixed to a distal end portion and a needle guard capable of storing the inner needle and the inner needle hub therein, wherein the needle guard has a multiplex structure including a plurality of cylindrical bodies. The needle guard and the inner needle hub each have a magnet,
The repulsive force between the magnets causes the inner needle hub to move inside the needle guard toward its proximal end, and the inner needle hub to sequentially pull out the tubular body to extend the needle guard. An indwelling needle, wherein the indwelling needle assembly is provided with locking means capable of holding the inner needle hub and the needle guard against a repulsive force between the magnets. Assembly. 2. A magnet provided on each of the needle guard and the inner needle hub, one of which is provided at a base end of the inner needle hub, and the other is a cylinder having a maximum diameter among a plurality of cylinders of the needle guard. Provided on the outer surface of the body, the center of the magnet on the needle guard in the axial direction of the inner needle when the inner needle hub and the needle guard are held by the locking means, The indwelling needle assembly according to claim 1, wherein the magnet is provided at a distal end side of a center of the magnet provided in the portion in the axial direction of the inner needle. 3. A holding plate is provided at a base end of the needle guard, and the holding plate is configured to hold the inner needle hub by a suction force between the inner guard hub and a magnet provided on the inner needle hub. 3. The indwelling needle assembly according to claim 1, wherein the indwelling needle assembly can be held at a proximal end side of the needle guard. 4. The indwelling needle assembly according to claim 1, wherein said holding plate is made of a magnet or a magnetic material. 5. The needle guard according to claim 2, wherein the needle guard comprises two cylindrical bodies.
The indwelling needle assembly according to any one of claims 1 to 4, which has a double structure. 6. The needle guard according to claim 3, wherein the needle guard comprises three cylindrical bodies.
The indwelling needle assembly according to any one of claims 1 to 4, which has a double structure.