JP2001238960A - Indwelling needle assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indwelling needle assembly which is capable of housing the needle tip of an inner needle after use with simple operation and preventing the reprotrusion of the once housed needle tip and has high safety in a waste treatment or the like. SOLUTION: This indwelling needle assembly 1 has an inner needle hub 5, the inner needle 4 which is fixed to the front end of the inner needle hub 5, a protector 6 which is capable of housing at least the needle tip 41 of the inner needle 4, an outer needle hub 3 which is installed outside the protector 6 and a hollow outer needle 2 which is fixed to the front end of the outer needle hub 3 and is inserted with the inner needle 4. The inner needle hub 5 comprises a main body part 51, an external part 52 and a connecting part 53 for connecting these parts. The connecting part 53 moves along a groove 61 disposed in the longitudinal direction of the protector 6, by which the inner needle hub 5 is moved relative to the protector 6. The assembly is so constituted that the base end of the inner needle hub 5 does not protrude from the base end of the protector 6 in the state that the needle tip 41 is housed into the protector 6.

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 for puncturing a blood vessel during, for example, infusion and indwelling it.

[0002]

2. Description of the Related Art 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 is indwelled. Such an indwelling needle has 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 a distal end, and an inner needle hub fixed to the proximal end of the inner needle. ing.

When puncturing the indwelling needle into a patient's blood vessel, the inner needle is inserted into the outer needle, and the puncture operation is performed with the needle tip of the inner needle protruding from the tip of the outer needle. When the needle tip of the inner needle reaches the inside of the blood vessel, the blood flowing from the opening of the needle tip flows through the inner lumen of the inner needle and flows into the inside of the transparent inner needle hub (flashback). Thereby, it can be confirmed that the inner needle has secured the blood vessel.

[0004] After confirming the flashback, the inner needle and the outer needle are advanced slightly, and the tip of the outer needle is inserted into the blood vessel. Next, while grasping the outer needle by hand, the inner needle is pulled out from the outer needle, and the connector of the infusion line is connected to the outer needle hub. Then, the infusion is administered through the connected infusion line and the outer needle.

By the way, the inner needle extracted from the outer needle is
Since it becomes unnecessary, it is disposed of. However, if this is discarded as it is, there is a risk that an accident may occur in which a disposal worker or the like accidentally stabs a finger or the like with the tip of the inner needle. In particular, since blood adheres to and remains on the surface and inside of the inner needle, infection may occur due to such a stab.

[0006] In order to solve this problem, there has been proposed an indwelling needle provided with a protector which is movable with respect to the inner needle hub and is capable of accommodating at least the needle tip of the inner needle.
Such an indwelling needle is configured such that, after extracting the inner needle from the outer needle, the inner needle hub is moved toward the proximal end of the protector, and the needle tip of the inner needle is stored in the protector. By installing this protector, it is possible to prevent an accident that a discarding worker or the like accidentally stabs a finger or the like with the tip of the inner needle.

However, such an indwelling needle has a structure such that when the inner needle hub is moved toward the proximal end of the protector, the proximal end of the inner needle hub protrudes from the proximal end of the protector. For this reason, there is the following problem in the operation of storing the needle tip of the inner needle in the protector.

For example, if the proximal end of the inner needle hub projecting from the proximal end of the protector hits the hand or the like, the needle tip of the inner needle may not be able to be stored in the protector. Also, if the base end of the inner needle hub protruding from the base end of the protector is accidentally pushed by hand or the like, the needle tip of the inner needle once stored in the protector will once again protrude from the front end of the protector. Sometimes.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to store a used needle tip of a used inner needle with a simple operation, and to prevent a once stored needle tip from protruding again. An object of the present invention is to provide an indwelling needle assembly that is highly safe in disposal and the like.

[0010]

This and other objects are achieved by the present invention which is defined below as (1) to (12).

(1) An inner needle hub, an inner needle fixed to the tip of the inner needle hub, a protector capable of accommodating at least a needle tip of the inner needle, and an outer needle hub installed outside the protector And a hollow outer needle fixed to the distal end of the outer needle hub and through which the inner needle is inserted, wherein the inner needle hub is
Installed to be movable in the longitudinal direction of the protector,
When the needle tip is stored in the protector,
An indwelling needle assembly, wherein a proximal end of the inner needle hub does not protrude from a proximal end of the protector.

(2) The indwelling needle assembly according to (1), wherein the outer needle hub has a maximum outer diameter substantially equal to or larger than the inner diameter of the protector.

(3) The inner needle hub has a main body inserted into the protector, and an exterior part outside the protector, and these are connected via a connecting part. The indwelling needle assembly according to 2).

(4) The indwelling needle assembly according to the above (3), wherein a filter member which is permeable to gas but not permeable to liquid is provided at a base end of the main body.

(5) The protector has a groove through which the connecting portion can pass, and the inner needle hub moves relative to the protector by moving the connecting portion along the groove. Or the indwelling needle assembly according to (4).

(6) The groove has a distal inner surface at a distal end thereof and a proximal inner surface at a proximal end thereof, and the groove has a proximal inner surface. The indwelling needle assembly according to the above (5), which defines a movement range.

(7) The indwelling needle set according to (5) or (6), wherein the protector has an auxiliary groove through which the connecting portion can pass, and the auxiliary groove and the groove are connected. Three-dimensional.

(8) The indwelling needle assembly according to (7), wherein a base end of the auxiliary groove is open at a base end of the protector.

(9) The indwelling needle assembly according to the above (7) or (8), wherein the auxiliary groove is formed so that a distal end thereof is bent at an acute angle toward a base end direction of the groove.

(10) The protector has a fitting portion capable of fitting with the outer needle hub.
The indwelling needle assembly according to any one of the above.

(11) The protector has a locking portion for locking the outer needle hub and restricting the movement of the outer needle hub in the proximal direction of the protector. The indwelling needle assembly according to any one of the above.

(12) An inner needle hub, an inner needle fixed to a tip of the inner needle hub, a protector capable of storing at least a needle tip of the inner needle, and an outer needle hub installed outside the protector And a hollow outer needle fixed to the distal end of the outer needle hub and through which the inner needle is inserted, wherein the inner needle hub is installed movably in a longitudinal direction of the protector, The needle hub has a main body inserted into the protector, an outer part outside the protector, and a connecting part connecting the main part and the outer part, and the protector is capable of passing through the connecting part. And a groove having a distal-side inner surface at a distal end and a proximal-side inner surface at a proximal end, and a groove defining a movement range of the connecting portion by an installation position of the distal-side inner surface and the proximal-side inner surface; and And the connection part can pass through An indwelling needle assembly which has an auxiliary groove which is open at a base end of the protector.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an indwelling needle assembly according to the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

FIG. 1 is a side view showing a first embodiment of the indwelling needle assembly of the present invention. 2 and 3 are longitudinal sectional views showing a first embodiment of the indwelling needle assembly of the present invention. In the following description, the right side in FIGS. 1, 2 and 3 is referred to as a “proximal end”, and the left side is referred to as a “distal end”.

The indwelling needle assembly 1 of the present invention shown in FIGS.
The inner needle hub 5, the inner needle 4 fixed to the distal end of the inner needle hub 5, the protector 6 capable of storing at least the needle tip 41 of the inner needle 4, and the protector 6 are installed outside the protector 6. It has an outer needle hub 3 and a hollow outer needle 2 fixed to the tip of the outer needle hub 3 and through which the inner needle 4 is inserted. Hereinafter, the configuration of each unit will be described.

The outer needle 2 preferably has a hollow shape and has a certain degree of flexibility. The constituent material of the outer needle 2 is not particularly limited.
Various flexible resins such as tetrafluoroethylene copolymer (ETFE), polyurethane, and polyether nylon resin are preferred.

Such an outer needle 2 may have all or part of its internal visibility. Further, for example, an X-ray contrast agent such as barium sulfate or barium carbonate may be blended into the constituent material of the outer needle 2 to provide a contrast function.

The distal end of the outer needle 2 has a tapered shape in which the outer diameter gradually decreases toward the distal end in order to puncture the living body easily and with minimal invasion.

An outer needle hub 3 is fixed to the proximal end of the outer needle 2 in a liquid-tight manner, and the inner cavity of the outer needle 2 and the inside of the outer needle hub 3 communicate with each other. The outer needle hub 3 is formed of a substantially cylindrical member.

The outer needle hub 3 is preferably made of a transparent (colorless and transparent), colored transparent or translucent resin, and the internal visibility is secured.

As a method for fixing the outer needle 2 to the outer needle hub 3, for example, a method such as fitting, caulking, fusion (heat fusion, high frequency fusion, or the like), adhesion with an adhesive, or a combination thereof is used. The method described above can be used.

A ring-shaped flange 31 is formed on the outer periphery of the proximal end of the outer needle hub 3. For example, when the operation of pulling out the inner needle 4 from the outer needle 2 is performed by hooking a finger on the flange 31 and performing this operation, this operation can be performed more reliably.

The outer needle hub 3 has the largest outer diameter at its base end, that is, the outer diameter of the flange 31. The outer diameter of the flange 31 (= the maximum outer diameter of the outer needle hub 3) will be described later. The inner diameter of the protector 6 is set to be substantially equal to or larger than the inner diameter of the protector 6. In the present embodiment, the outer diameter of the flange 31 is larger than the inner diameter of the protector 6.

For example, when the outer needle hub 3 is configured to be housed in the protector 6, that is, when the inner diameter of the protector 6 is set to a value larger than the maximum outer diameter of the outer needle hub 3, the inner diameter of the protector 6 is changed. And the outer diameter increases. For this reason, the indwelling needle assembly 1 becomes thick and large as a whole,
This is disadvantageous for downsizing and reducing the diameter of the indwelling needle assembly 1. On the other hand, in the indwelling needle assembly 1 of the present invention, by increasing the outer diameter of the flange 31 to a value larger than the inner diameter of the protector 6, an increase in the inner diameter and the outer diameter of the protector 6 is prevented. This is advantageous for miniaturization and reduction in diameter.

The inner needle 4 is a hollow needle and is made of, for example, a metal material such as stainless steel, aluminum or an aluminum alloy, titanium or a titanium alloy.
A sharp needle tip 41 is formed at the tip of the inner needle 4. The shape of the needle tip 41 is not particularly limited, and in the present embodiment, has a blade surface inclined at a predetermined angle with respect to the axis of the inner needle 4.

The inner needle 4 is used in a state of being inserted into the hollow of the outer needle 2, that is, in a state shown in FIGS. Hereinafter, this state is referred to as an “assembled state”.

The length of the inner needle 4 is such that at least the needle tip 41 protrudes from the distal end opening 21 of the outer needle 2 when assembled.

The inner needle hub 5 has a main body 51 inserted into the protector 6, which will be described later, and an outer part 52 installed outside the protector 6, and the main part 51 and the outer part 52 are connected to each other by a connecting part 53. Are connected via.

The main body 51 is fixed to the proximal end of the inner needle 4 in a liquid-tight manner, and the internal space of the main body 51 communicates with the lumen of the inner needle 4.

In this embodiment, the main body 51 and the inner needle 4 are adhered and fixed by an adhesive (see FIG. 2). However, the method of fixing the main body 51 to the inner needle 4 is not limited to this, and may be, for example, a method such as fitting or caulking, or a method combining these methods and the above-mentioned adhesive fixing.

The main body 51 is preferably made of a transparent (colorless and transparent), colored transparent or translucent resin, and the internal visibility is secured. Thus, it is possible to visually check the flashback of blood when the needle tip 41 secures a blood vessel.

The main body 51 is formed of a substantially cylindrical hollow member. The outer diameter of the main body 51 is slightly smaller than the inner diameter of the protector 6. Thereby, the main body 51 can move smoothly within the protector 6.

In the vicinity of the opening on the base end side of the main body 51, a ring-shaped protrusion 511 is formed on the inner peripheral surface thereof. The filter member 54 is mounted on the protrusion 511. The filter member 54 has a property of transmitting gas but not liquid.

Specific examples of the filter member 54 include various sintered porous bodies, hydrophobic nonwoven fabrics, and other porous bodies. In this case, as the sintered porous body, for example, a material obtained by sintering a material containing a polymer material (powder) such as polyethylene and a hydrophilic (water-soluble, water-swellable) polymer is preferable. When this sintered porous body is used, ventilation is blocked by contact with a liquid (blood), so that invasion of air from the outside can be prevented.

As a method of fixing the filter member 54 to the protruding portion 511, for example, a method such as fusion or adhesion with an adhesive, or a method using both of them can be mentioned.

The exterior part 52 is installed outside the protector 6 and is formed of a substantially cylindrical hollow member. The inner diameter of the exterior part 52 is set to a value slightly larger than the outer diameter of the protector 6. Thereby, the exterior part 52 is connected to the protector 6.
You can move smoothly outside the house.

The exterior part 52 is preferably made of a transparent (colorless and transparent), colored transparent or translucent resin, and the internal visibility is secured.

A ring-shaped flange 521 is formed on the outer periphery of the outer end of the exterior part 52. For example, outer needle 2
When the operation of pulling out the inner needle 4 from is performed by hooking a finger on the flange 521, the operation can be performed more reliably.

The connecting portion 53 connects the main body 51 and the exterior 52. The connecting portion 53 is connected to the protector 6
Are located in a groove 61 formed in the longitudinal direction of the
Can move along. Thereby, the main body 5
1, the exterior part 52 and the connection part 53 can move in the longitudinal direction of the protector 6 as one body.

In the present embodiment, the cross-sectional shape and the vertical cross-sectional shape of the connecting portion 53 are each substantially square. However, the shape of the connecting portion 53 is not limited to this, and the shape of the groove 6
Any shape may be used as long as it can move smoothly along 1.

The protector 6 can accommodate the needle tip 41 of the inner needle 4. The protector 6 is formed of a substantially cylindrical hollow member.

The protector 6 is preferably made of a transparent (colorless and transparent), colored transparent or translucent resin, and the internal visibility is secured.

The constituent materials of the outer needle hub 3, the inner needle hub 5 (the main body 51, the outer part 52 and the connecting part 53), and the protector 6 are not particularly limited. For example, polyethylene, polypropylene, polybutadiene, ethylene- Polyolefin such as vinyl acetate copolymer, polyvinyl chloride, polyurethane, polystyrene, polymethyl methacrylate, polycarbonate, polyamide, polyethylene terephthalate, polyester such as polybutylene terephthalate, acrylic resin, ABS resin, AS resin, ionomer, polyacetal, polyphenylene Various resin materials such as sulfide and polyetheretherketone are exemplified.

The distal end of the protector 6 is connected to the outer needle hub 3.
However, the present invention is not limited to this, and may be configured so that the distal end of the protector 6 can be fitted to the proximal end of the outer needle hub 3.

The protector 6 has a pair of grooves 61 penetrating inside and outside the protector 6. The grooves 61 are formed at positions opposite to each other via the central axis of the protector 6 along the longitudinal direction of the protector 6. As described above, the connecting portions 53 of the inner needle hub 5 are provided in these grooves 61.
Is located. Therefore, the inner needle hub 5 can move with respect to the protector 6 by moving the connecting portion 53 along the groove 61.

In this embodiment, the shape of the groove 61 is substantially rectangular, and the inner surface 611 on the distal side and the inner surface 6 on the proximal side are formed.
12. The shape of the groove 61 is not limited to this, and any shape may be used as long as the connecting portion 53 can move smoothly.

The position of the distal inner surface 611 and the proximal inner surface 612 limits the longitudinal movement range of the connecting portion 53 of the protector 6. That is, the inner needle hub 5 is allowed to move only within a predetermined range in the longitudinal direction of the protector 6.

In the assembled state, the distal end of the connecting portion 53 abuts on the distal inner surface 611. Thereby, the inner needle hub 5
Is prevented from moving from the assembled position to the distal end side. For this reason, the inner needle 4 is
Is kept constant from the distal end opening 21.

On the other hand, when the inner needle hub 5 moves in the proximal direction of the protector 6 and the proximal end of the connecting portion 53 abuts on the proximal inner surface 612, the needle tip 41 of the inner needle 4 moves into the protector 6. While being stored, the inner needle hub 5 is connected to the connecting portion 53.
From the position where the base end and the base end side inner surface 612 abut on each other, that is, the base end is prevented from falling off the protector 6.

The length from the proximal end of the connecting portion 53 to the proximal end of the inner needle hub 5 (length X in FIGS. 2 and 3)
2 is set to be longer than the length from the base inner surface 612 to the base end of the protector 6 (length Y in FIGS. 2 and 3).
Therefore, when the needle tip 41 of the inner needle 4 is stored in the protector 6 (see FIG. 3), the base end of the inner needle hub 5 is prevented from protruding from the base end of the protector 6. This allows
For example, when the needle tip 41 of the inner needle 4 is stored in the protector 6, the base end of the inner needle hub 5 hits a hand or the like,
The needle tip 41 cannot be completely stored in the protector 6, or the base end of the inner needle hub 5 is pushed by a hand or the like, and the needle tip 41 once stored in the protector 6 is once again moved from the distal end of the protector 6. It can be prevented from protruding.

Further, the protector 6 has a needle tip 4 of the inner needle 4.
You may have the maintenance means which can maintain the state where 1 was stored.

The retaining means is not particularly limited. For example, the retaining means is constituted by a groove formed in the circumferential direction of the protector 6 continuously to the base end of the groove 61, and is provided at the distal end side of the protector 6. The needle tip 41 is provided with the protector 6
And a shutter member that prevents the needle tip 41 from passing through to the tip end side. By providing such a maintaining means, it is possible to more reliably prevent the needle tip 41 once stored in the protector 6 from protruding from the tip of the protector 6 again. Safety is improved.

The protector 6 has a connecting portion 5 of the inner needle hub 5.
An auxiliary groove 62 through which 3 can pass is formed. This auxiliary groove 62 is a groove used for assembling the indwelling needle assembly 1 to place the inner needle hub 5 and the protector 6 in a predetermined position, that is, to position the connecting portion 53 in the groove 61.

The auxiliary grooves 62 are formed substantially in parallel with each groove 61 and penetrate inside and outside the protector 6. These auxiliary grooves 62 have their leading ends connected to the grooves 61, while their base ends are open at the base end of the protector 6.

Further, the tip of the auxiliary groove 62 is
The groove 21 is bent at an acute angle toward the base end of the groove 61 with the top as 21. Thereby, for example, at the time of the operation of extracting the inner needle 4 from the outer needle 2, that is, the inner needle hub 5 is connected to the protector 6
In the operation of moving the connecting portion 53 in the base end direction, the connecting portion 53 moving along the groove 61 can be more reliably prevented from entering the auxiliary groove 62.

By providing such an auxiliary groove 62, the inner needle hub 5 and the protector 6 can be assembled as follows.

First, the outer part 52 of the inner needle hub 5 is gripped,
The inner needle hub 5 is moved from the proximal end of the protector 6 toward the distal end so as to insert the inner needle 4 and the main body 51 of the inner needle hub 5 into the inner cavity in this order. Further, when the inner needle hub 5 is moved toward the distal end of the protector 6, the exterior portion 52 covers the outer peripheral portion on the proximal end side of the protector 6, and then the distal end of the connecting portion 53 comes into contact with the proximal end of the protector 6. At this time, the inner needle hub 5 cannot move in the tip direction of the protector 6.

Next, when the inner needle hub 5 is relatively rotated in the circumferential direction of the protector 6 while pushing the inner needle hub 5 toward the distal end of the protector 6, the distal end of the connecting portion 53 contacts the proximal end of the protector 6. It rotates in the circumferential direction of the protector 6 while being in contact with it, and then is inserted into the auxiliary groove 62 when located at the base end of the auxiliary groove 62. As a result, the inner needle hub 5
Allows the protector 6 to move in the distal direction.

Further, when the inner needle hub 5 is moved toward the distal end of the protector 6, the connecting portion 53 moves toward the distal end along the auxiliary groove 62, and reaches near the bending of the distal end. The tip contacts the inner surface 621.

Next, when the inner needle hub 5 is moved obliquely toward the base end of the groove 61, the connecting portion 53 is moved to the auxiliary groove 6.
It moves obliquely toward the base end direction of the groove 61 along the bend of 2 and enters the groove 61.

Thereafter, when the inner needle hub 5 is moved in the distal direction of the protector 6, the connecting portion 53 moves in the distal direction along the groove 61, and the distal end contacts the distal inner surface 611. Thereby, the inner needle hub 5 and the protector 6
It is in an assembled state.

For example, if the auxiliary groove 62 is not formed in the protector 6, the inner needle hub 5
And protector 6 are difficult to assemble. For this reason, in the indwelling needle assembly 1 in which the auxiliary groove 62 is not formed in the protector 6, first, the protector 6 is manufactured by dividing it into at least two parts, and then the inner needle hub 5 and the protector 6 are assembled. There is a need. Therefore, in such an indwelling needle assembly 1, the number of parts increases, which is not preferable. On the other hand, in the indwelling needle assembly 1 of the present invention, since the auxiliary groove 62 is formed in the protector 6, the number of parts does not increase. In particular, since the auxiliary groove 62 is formed in the protector 6, the configuration is simple, which contributes to miniaturization and diameter reduction.

The width of the tip of the auxiliary groove 62 is preferably slightly smaller than the width of the connecting portion 53. Thereby, it is possible to more reliably prevent the connecting portion 53 once moved into the groove 61 from returning to the auxiliary groove 62 again.

Next, an example of a method of using the indwelling needle assembly 1 will be described in detail with reference to FIGS.

[1] While holding the indwelling needle assembly 1 in the assembled state (see FIGS. 1 and 2), the inner needle 4 and the outer needle 2 are punctured into a blood vessel (vein or artery) of the patient.

When the tip 41 of the inner needle 4 is punctured into a blood vessel,
The blood flows backward in the inner needle 4 in the proximal direction due to the internal pressure (blood pressure) of the blood vessel, is introduced into the main body 51 of the inner needle hub 5, and the flashback is visually recognized through the inner needle hub 5 having visibility. can do. This makes it possible to know that the needle tip 41 of the inner needle 4 has secured a blood vessel.

Incidentally, with the inflow of the blood, the inner needle hub 5
The air inside the main body 51 is discharged through the filter member 54, but the blood cannot pass through the filter member 54 and does not leak to the outside.

[2] When the inner needle 4 and the outer needle 2 are further advanced in the distal direction by a small distance, the distal opening 21 of the outer needle 2 is inserted into the blood vessel. Thereby, the outer needle 2 secures a blood vessel.

[3] While holding the outer needle 2 placed in the blood vessel by hand, the outer hand 52 of the inner needle hub 5 is gripped by the other hand and pulled in the proximal direction. As a result, the inner needle 4 and the inner needle hub 5 move in the proximal direction with respect to the protector 6, and
The inner needle 4 is withdrawn from the outer needle 2.

[4] A connector or the like (not shown) of an infusion set is quickly connected to the outer needle hub 3 of the outer needle 2 from which the inner needle 4 has been removed, and administration of the infusion is started according to a standard method.

[5] On the other hand, after the inner needle 4 is extracted from the outer needle 2, the inner needle 4, the inner needle hub 5, and the protector 6 become unnecessary, and are discarded as follows.

When the inner needle hub 5 is further pulled in the proximal direction from the state of the step [3], the proximal end of the connecting portion 53 comes into contact with the proximal inner surface 612 of the groove 61. At this time, the proximal end of the inner needle hub 5 does not protrude from the proximal end of the protector 6 (see FIG. 3). As a result, the base end of the inner needle hub 5 does not touch a hand or the like, and the needle tip 41 of the inner needle 4 is
Is stored inside.

The state where the needle tip 41 of the inner needle 4 is housed in the protector 6, that is, the base end of the connecting portion 53 is
The base end of the inner needle hub 5 does not protrude from the base end of the protector 6 in a state in which the base needle abuts on the base end side inner surface 612. For this reason,
The proximal end of the inner needle hub 5 is not pushed by hand or the like, and the needle tip 41 once stored in the protector 6 can be prevented from protruding from the distal end of the protector 6 again.

Thus, it is possible to prevent an accident such as a person who performs disposal processing accidentally sticking a finger or the like with the needle tip 41.

FIG. 4 is a longitudinal sectional view showing a second embodiment of the indwelling needle assembly 1 of the present invention. Hereinafter, the indwelling needle assembly 1 shown in FIG. 4 will be described focusing on the differences from the first embodiment, and the description of the same matters will be omitted. In the following description, the right side in FIG.
The left side is called the "tip".

In the indwelling needle assembly 1 of the second embodiment, the shape of the tip of the protector 6 is different. That is, the protector 6 has a tapered fitting portion 63 at its tip,
A plate-shaped (or small-piece) locking portion 64 protruding outward is formed near the base end of the fitting portion 63.

Thus, the proximal end of the outer needle hub 3 is fitted with the fitting portion 63, and the proximal end of the outer needle hub 3 is locked by the locking portion 64. Therefore, the outer needle hub 3 is reliably prevented from coming off the protector 6, and the movement of the protector 6 in the proximal direction is reliably restricted.

In such an indwelling needle assembly 1, for example,
At the time of removing the inner needle 4 from the outer needle 2, after the needle tip 41 of the inner needle 4 is stored in the protector 6, the protector 6 is detached from the outer needle hub 3, so that a person who performs disposal processing, etc. An accident of accidentally stabbing a finger or the like with the needle tip 41 can be more reliably prevented.

In addition, in such an indwelling needle assembly 1, the movement of the outer needle hub 3 in the proximal direction of the protector 6 is restricted. Thereby, since the inner needle 4 can more reliably maintain the protruding length of the outer needle 2 from the distal end opening 21 in the assembled state, for example, the inner needle 4 and the outer needle 2 can be connected to a blood vessel (vein or artery). This operation can be performed more reliably when puncturing is performed.

The indwelling needle assembly according to the present invention has been described with reference to the illustrated embodiment. However, the present invention is not limited to this, and each part constituting the indwelling needle assembly exhibits the same function. Any configuration that can be used can be substituted.

[0091]

As described above, according to the present invention, the needle tip of the used inner needle can be stored in the protector quickly and safely by a simple operation. The stored needle point can be prevented from projecting again from the tip of the protector. For this reason, accidents such as accidentally stabbing a finger or the like with a needle tip during disposal processing and the like are prevented, and safety is high.

When the protector is provided with an auxiliary groove, the inner needle hub and the protector can be easily assembled, and the number of parts can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of an indwelling needle assembly according to the present invention.

FIG. 2 is a longitudinal sectional view showing a first embodiment of the indwelling needle assembly of the present invention.

FIG. 3 is a longitudinal sectional view showing a first embodiment of the indwelling needle assembly of the present invention.

FIG. 4 is a longitudinal sectional view showing a second embodiment of the indwelling needle assembly of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 indwelling needle assembly 2 outer needle 21 tip opening 3 outer needle hub 31 flange 4 inner needle 41 needle tip 5 inner needle hub 51 main body part 511 projecting part 52 exterior part 521 flange 53 connecting part 54 filter member 6 protector 61 groove 611 tip Side inner surface 612 Base end side inner surface 62 Auxiliary groove 621 Inner surface 63 Fitting portion 64 Locking portion

Claims (12)

[Claims] An inner needle hub; an inner needle fixed to a distal end of the inner needle hub; a protector capable of storing at least a needle tip of the inner needle; and an outer needle hub installed outside the protector. A hollow outer needle fixed to the distal end portion of the outer needle hub and through which the inner needle is inserted, wherein the inner needle hub is installed so as to be movable in a longitudinal direction of the protector, and the needle tip Wherein the proximal end of the inner needle hub does not protrude from the proximal end of the protector when is stored in the protector. 2. The indwelling needle assembly according to claim 1, wherein the outer needle hub has a maximum outer diameter substantially equal to or larger than the inner diameter of the protector. 3. The inner needle hub has a main body inserted into the protector, and an exterior part outside the protector,
The indwelling needle assembly according to claim 1 or 2, wherein these are connected via a connecting portion. 4. The indwelling needle assembly according to claim 3, wherein a filter member, which is permeable to gas but not permeable to liquid, is provided at a base end of the main body. 5. The protector has a groove through which the connecting portion can pass, and the inner needle hub moves relative to the protector when the connecting portion moves along the groove. An indwelling needle assembly according to item 1. 6. The groove has a distal-side inner surface at a distal end thereof and a proximal-side inner surface at a proximal end thereof, and the connecting portion is moved by an installation position of the distal-side inner surface and the proximal-side inner surface. The indwelling needle assembly according to claim 5, which defines a range. 7. The indwelling needle assembly according to claim 5, wherein the protector has an auxiliary groove through which the connecting portion can pass, and the auxiliary groove and the groove are connected. 8. The indwelling needle assembly according to claim 7, wherein a base end of the auxiliary groove is open at a base end of the protector. 9. The indwelling needle assembly according to claim 7, wherein the auxiliary groove is formed such that a distal end portion thereof is bent at an acute angle toward a base end direction of the groove. 10. The indwelling needle assembly according to claim 1, wherein the protector has a fitting portion capable of fitting with the outer needle hub. 11. The protector according to claim 1, wherein the protector has a locking portion for locking the outer needle hub and restricting movement of the outer needle hub in a proximal direction of the protector. The indwelling needle assembly according to any one of the preceding claims. 12. An inner needle hub, an inner needle fixed to a tip portion of the inner needle hub, a protector capable of storing at least a needle tip of the inner needle, and an outer needle hub installed outside the protector. A hollow outer needle fixed to a distal end portion of the outer needle hub and through which the inner needle is inserted, wherein the inner needle hub is installed so as to be movable in a longitudinal direction of the protector; The hub has a main body inserted into the protector, an outer part outside the protector, and a connecting part connecting the main part and the outer part, wherein the protector is capable of passing through the connecting part, A groove having a distal-side inner surface at a distal end and a proximal-side inner surface at a proximal end, and defining a moving range in the connecting portion by an installation position of the distal-side inner surface and the proximal-side inner surface, and the groove Are connected and can pass through the connection part. Ri, and the indwelling needle assembly, characterized in that with the auxiliary groove which is open at the proximal end of the protector.