JP2001218852A - Indwelling needle assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indwelling needle assembly having excellent operability for piercing a blood vein and connecting an infusion line or the like and having high safety for disposal or the like. SOLUTION: This indwelling needle assembly 1 is provided with an outer needle hub 3 having a lumen section 31, a hollow outer needle 2 fixed to the outer needle hub 3, an inner needle hub 5, an inner needle 4 insertable into the outer needle 2 fixed to the inner needle hub 5, a protector 6 movable relatively to the inner needle hub 5 and capable of storing at least the needle tip 41 of the inner needle 4, and a pair of operating members 7 having a coupling section 72 installed on the outer needle hub 3 and capable of being coupled with the inner needle hub 5 and a blocking section 73 capable of blocking the middle of the lumen section 31 of the outer needle hub 3. The operating members 7 can conduct an action to release the coupling between the coupling section 72 and the inner needle hub 5 and an action of the blocking section 73 to block the outer needle hub 3 nearly concurrently or continuously.

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.

Accordingly, measures have been taken such as disposing of the used inner needle in the opened packaging material containing the indwelling needle kit, or disposing the inner needle with a cap. I have.

However, even when such an inner needle is wrapped with a wrapping material or covered with a cap, blood adhering to or remaining on the inner needle may reach the operator's hand or work may be performed with the needle of the inner needle. In order to prevent erroneous stabbing of the hand of a patient, great care must be taken, and there is a problem that disposal of the inner needle after use requires a great deal of trouble.

In the conventional indwelling needle, when the inner needle is pulled out, blood flows backward through the outer needle, so that connecting the infusion line connector to the outer needle hub takes time and takes much time. In such a case, there is a problem that blood leaks from the proximal end of the outer needle hub and contaminates the surroundings.

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an indwelling needle assembly which is excellent in operability such as puncture of blood vessels and connection of an infusion line, and a highly safe indwelling needle assembly for disposal processing. To provide.

[0010]

This and other objects are achieved by the present invention which is defined below as (1) to (13).

(1) An outer needle hub having a lumen, a hollow outer needle fixed to the outer needle hub, an inner needle hub, fixed to the inner needle hub, and insertable into the outer needle. Nanai needle and
A protector movable relative to the inner needle hub and capable of storing at least the needle tip of the inner needle; an engaging portion installed on the outer needle hub and engageable with the inner needle hub; A closing portion capable of closing the middle of the lumen of the outer needle hub, comprising at least one operating member, wherein the operating member engages the engaging portion with the inner needle hub. An indwelling needle assembly characterized in that the releasing operation and the operation of closing the outer needle hub by the closing portion can be performed substantially simultaneously or continuously.

(2) 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.
An indwelling needle assembly according to item 1.

(3) The protector has a groove formed in the longitudinal direction thereof, and the inner needle hub moves relative to the protector when the connecting portion moves along the groove. 20).

(4) The indwelling needle assembly according to the above (2) or (3), wherein a filter member that is permeable to gas but not permeable to liquid is installed at a base end of the main body.

(5) The indwelling needle assembly according to any one of (2) to (4), wherein the exterior portion is engaged with the engagement portion.

(6) The indwelling needle assembly according to any one of the above (1) to (5), wherein the protector has a maintaining means capable of maintaining a state in which the tip of the inner needle is housed.

(7) The indwelling needle assembly according to the above (6), wherein the maintaining means is configured to restrict the movement of the inner needle hub in the distal direction of the protector.

(8) The indwelling needle assembly according to any one of (1) to (7), wherein the protector has a fitting portion capable of fitting with the outer needle hub.

(9) An outer needle hub having an inner cavity, a hollow outer needle fixed to the outer needle hub, an inner needle hub, fixed to the inner needle hub, and insertable into the outer needle. Nanai needle and
At least one operating member provided with the outer needle hub and having an engaging portion capable of engaging with the inner needle hub, and a closing portion capable of closing a middle of a lumen portion of the outer needle hub; And the operation member performs substantially simultaneously or continuously an operation of releasing the engagement between the engagement portion and the inner needle hub and an operation of closing the outer needle hub by the closing portion. An indwelling needle assembly characterized in that the indwelling needle assembly is configured to perform

(10) The operating member is supported on the outer needle hub by a support portion, and the engaging portion and the closing portion are configured to rotate around the support portion. The indwelling needle assembly according to any one of (9) to (9).

(11) The indwelling needle assembly according to any one of (1) to (10), wherein the operation members are provided in pairs on opposite sides of each other with the center axis of the outer needle hub therebetween. Three-dimensional.

(12) The operation of closing the outer needle hub is performed by closing a portion of the outer needle hub, which comes into contact with the closing portion, from the outside of the portion. The indwelling needle assembly according to any one of the above.

(13) The outer needle hub has at least
The above-mentioned (1), in which a portion where the closing portion abuts has flexibility.
The indwelling needle assembly according to any one of (12) to (12).

[0024]

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 plan view showing a first embodiment of the indwelling needle assembly of the present invention, and FIGS. 2, 3 and 4 are longitudinal sections showing the first embodiment of the indwelling needle assembly of the present invention. FIG. 5 and FIG.
FIG. 6 is a sectional view taken along the line AA in FIG. 2, and FIG. 6 is a sectional view taken along the line BB in FIG. In the following description, the right side in FIGS. 1 to 4 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.
Is an outer needle hub 3 having a lumen, a hollow outer needle 2 fixed to the outer needle hub 3, an inner needle hub 5, fixed to the inner needle hub 5, and An inner needle 4 which can be inserted, a protector 6 which is movable relative to the inner needle hub 5 and is capable of accommodating a needle tip 41 of the inner needle 4, and an outer needle hub 3
And an operation member 7 installed at 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.

The 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 whose outer diameter gradually decreases toward the distal end in order to easily and puncture the living body with low invasiveness.

The outer needle hub 3 is fixed to the base end of the outer needle 2 in a liquid-tight manner. The outer needle hub 3 is formed of a substantially cylindrical member, and has a lumen 31 formed therein. The lumen 31 communicates with the lumen of the outer needle 2.

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.

The outer needle hub 3 has a tapered shape whose inner and outer diameters gradually increase toward the proximal end. Thereby, the outer needle hub 3 can be easily and reliably fitted to the distal end portion of the protector 6 described later in the tapered portion.

The shape of the outer needle hub 3 is not limited to the one shown in the drawing, and may be any shape as long as it can be fitted to the distal end of the protector 6.

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.

The outer needle hub 3 is made of a material having elasticity (flexibility). Thereby, the outer needle hub 3
The lumen 3 is closed by the closing portion 73 of the operation member 7 described later.
When the block 1 is closed and the block by the block 73 is released, the shape returns to the original shape, and the lumen 31 is opened.

The constituent material of the outer needle hub 3 is, for example, natural rubber, isoprene rubber, silicone rubber, urethane rubber, styrene-butadiene rubber,
Examples include various rubber materials such as fluorine rubber and acrylic rubber, and elastic materials (or soft materials) such as various thermoplastic elastomers such as polyamide, polyester, and olefin.

The outer needle hub 3 does not have to be made of the above-mentioned material in all parts.
3 and the portion in contact therewith is made of the above material,
The remaining part may be made of a resin having relatively high hardness.

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. In the present embodiment, the outer diameter of the main body 51 is
The value 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 non-woven 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, adhesion with an adhesive, or a method using both of them can be used.

The exterior part 52 is provided outside the protector 6 and is formed of a substantially cylindrical hollow member. In the present embodiment, 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
Can move smoothly outside the protector 6.

The exterior portion 52 is preferably made of a transparent (colorless and transparent), colored transparent or translucent resin, so that 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. This flange 5
21 is engaged with an engagement portion 72 of the operation member 7 described later in an assembled state.

The connecting portion 53 connects the main body 51 and the exterior 52. The connecting portion 53 is connected to the protector 6
And can move along the groove 61. Thereby, the main body part 51, the exterior part 52, and the connecting part 53 can move integrally with respect to the longitudinal direction of the protector 6.

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 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, and are, for example, polyethylene, polypropylene, polybutadiene, ethylene-vinyl acetate copolymer, respectively. Polyolefin such as polyvinyl chloride, polyurethane, polystyrene, polymethyl methacrylate, polycarbonate, polyamide, polyester such as polyethylene terephthalate, polybutylene terephthalate, acrylic resin, ABS resin, AS resin, ionomer,
Various resin materials such as polyacetal, polyphenylene sulfide, and polyetheretherketone are exemplified.

A step-shaped fitting portion 63 is formed on the distal end side of the protector 6. The fitting portion 63 fits with the base end of the outer needle hub 3 in the assembled state.

Note that the fitting portion 63 may not be formed on the distal end side of the protector 6.
May simply be in contact with the base end.

The protector 6 has a pair of grooves 61 penetrating the inside and outside of 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 the present embodiment, the shape of the groove 61 is substantially rectangular, and the inner surface 611 at the distal end and the inner surface 6 at the proximal end 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 distal end side inner surface 611 and the proximal end side inner surface 612 restrict the connecting portion 53 from moving in the longitudinal direction 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 comes into contact with the inner surface 611 on the distal end side. Thereby, the inner needle hub 5
Is prevented from moving from the assembled position to the distal end side. For this reason, the length of projection of the needle tip 41 of the inner needle 4 from the distal end opening 21 of the outer needle 2 is kept constant.

On the other hand, when the inner needle hub 5 moves in the proximal direction of the protector 6 and the connecting portion 53 abuts on the proximal inner surface 612, the needle tip 41 of the inner needle 4 is stored in the protector 6. Becomes

Further, by providing such a proximal inner surface 612, the inner needle hub 5 can be moved from the position where the connecting portion 53 abuts on the proximal inner surface 612 to the proximal end, that is, the protector can be moved. 6 is prevented from falling off.

The protector 6 is provided with a needle tip 41 of the inner needle 4.
Has a maintenance means capable of maintaining the state in which is stored.

This retaining means is constituted by a substantially L-shaped groove 62 formed so as to penetrate inside and outside the protector 6. The groove 62 has a distal inner surface 621 at the distal end.

The groove 62 is formed at the base end of the groove 61.
Is formed subsequently. By providing such a groove 62, the following operation and effect are produced.

First, when the inner needle hub 5 is moved toward the proximal end of the protector 6, the connecting portion 53 moves in the longitudinal direction of the protector 6 from the distal end to the proximal end along the groove 61. It abuts on the inner surface 612 on the end side and is prevented from moving further to the proximal side.

Next, when the inner needle hub 5 is rotated relative to the protector 6, the connecting portion 53 is moved along the groove 62.
The protector 6 moves to the limit in the circumferential direction.

Thereafter, when the inner needle hub 5 is moved toward the distal end of the protector 6, the connecting portion 53 moves a predetermined distance in the distal end direction of the protector 6, and contacts the inner surface 621 on the distal end side of the groove 62.

At this time, since the movement of the protector 6 in the circumferential direction is prevented, the connecting portion 53 cannot return to the position of the groove 61. Thereby, the movement of the inner needle hub 5 in the circumferential direction and the tip direction of the protector 6 is restricted.

Incidentally, even in this state, the needle tip 41 of the inner needle 4 is stored in the protector 6.

The width of the groove 62 in the vicinity of the inner surface 621 on the tip side is preferably formed to be slightly smaller than the width of the connecting portion 53. With such a configuration, when the distal end of the connecting portion 53 is in contact with the inner surface 621 on the distal end side, the connecting portion 53
Fits into the groove 62 near the distal-side inner surface 621, making it difficult for the protector 6 to return in the proximal direction. Thereby, the inner needle hub 5 is fixed to the protector 6, and the state in which the needle tip 41 of the inner needle 4 is stored can be more reliably maintained.

The operation of exerting the function of the maintaining means can be performed continuously with the operation of moving the inner needle hub 5 (the connecting portion 53) in the longitudinal direction of the protector 6, so that the operation is extremely easily performed. be able to.

Since the groove 62 is formed in the protector 6, the structure is simple, the number of parts is not increased, and the size and the diameter are reduced.

The operating member 7 includes an operating member main body 71, an engaging portion 72 that can be engaged with the inner needle hub 5 (flange 521),
A closing portion 73 capable of closing the lumen 31 of the outer needle hub 3 and a supporting portion 74 for supporting the outer needle hub 3 outside the hub 3
And

The operating member 7 is configured such that the engaging portion 72 and the closing portion 73 rotate around the support portion 74.

Although the number of such operating members 7 is not particularly limited, in the present embodiment, the operating members 7 are installed in pairs on the opposite sides with respect to the center axis of the outer needle hub 3.

The operation member main body 71 is formed of a plate-like member. For example, when a force such as pressing is applied to the operation member main body 71 from the outside, the engaging portion 72 and the closing portion 73
It can rotate around the support part 74.

In the assembled state, the operating member main body 71 has a tapered shape so as to move away from the center axis of the outer needle hub 3 from the vicinity where the support portion 74 is formed to the tip. Thereby, the operation member main body 71
Since the front end side can take a long stroke with the outer needle hub 3, for example, the operability such as the operation of closing the inner cavity 31 by the closing portion 73 and the reliability of the closing are improved.

The engaging portion 72 is formed at the base end of the operation member main body 71 as a plate-like (or small-piece) projection projecting inward. The engaging portion 72 is configured to engage with the inner needle hub 5 (flange 521) in an assembled state. As a result, the inner needle hub 5 is prevented from moving in the proximal direction of the protector 6, and the inner needle 4 has
In 1, the protruding length of the outer needle 2 from the distal end opening 21 is kept constant in the assembled state. Therefore, for example, when the inner needle 4 and the outer needle 2 are punctured into a blood vessel (vein or artery), this operation can be performed more reliably.

In the present embodiment, the engagement between the engaging portion 72 and the inner needle hub 5 is performed by connecting the distal end of the engaging portion 72 to the flange 521.
Is a configuration that simply abuts against the base end, but is not limited to this.
For example, the configuration may be such that the engaging portion 72 and the flange 521 can be fitted.

The closing portion 73 can close the inner cavity 31 by pressing the outer needle hub 3 from the outside. The closing portion 73 is formed as a plate-shaped protruding portion that protrudes inward on the distal end side of the operation member main body 71.

The closing portion 73 presses the outer needle hub 3 from the outside and can close the inner cavity portion 31 if the outer needle hub 3 can be closed.
It may be of any shape.

The length of the closing portion 73 (length L in FIG. 1)
The outer needle hub 3 has a value that is substantially equal to half of the outer peripheral length of the portion of the outer needle hub 3 that the closed portion 73 contacts, or a value slightly larger than this. Thereby, the obstructiveness of the lumen 31 is improved.

The support section 74 supports the operating member 7 on the outer needle hub 3. The support portion 74 is located between the engagement portion 72 and the closing portion 73, and is formed as a plate-shaped protrusion having an L-shaped cross section. The bottom surface of the support portion 74 is fixed to the outer peripheral surface of the outer needle hub 3 by adhesion or fusion.

The support portion 74 is centered on the engaging portion 72.
The closing part 73 can rotate.

Operation member 7 (operation member main body 71, engaging portion 7
2. The constituent materials of the closing portion 73 and the supporting portion 74) are not particularly limited, and include, for example, polyethylene, polypropylene, polybutadiene, polyolefin such as ethylene-vinyl acetate copolymer, polyvinyl chloride, polyurethane, polystyrene, and polymethyl. Methacrylate, polycarbonate, polyamide, polyester such as polyethylene terephthalate, polybutylene terephthalate, acrylic resin, ABS resin, AS resin, ionomer,
Various resin materials such as polyacetal, polyphenylene sulfide, and polyetheretherketone are exemplified.

In this embodiment, the operating member 7 is formed integrally as a whole, but is not limited to this. The operating member body 71, the engaging portion 72, the closing portion 73, and the supporting portion At least a part of 74 may be constituted by another member.

When the operating member 7 is assembled (see FIG. 2), the distal end side of the operating member main body 71 is pressed in the direction of the arrow in the figure, so that the operating member 7 The closing portion 73 rotates. As a result, the engagement of the engagement portion 72 with the inner needle hub 5 (flange 521) is released, and the closing portion 73 presses the outer needle hub 3 from the outside almost simultaneously or continuously.

Further, by pressing the distal end side of the operating member main body 71 in the direction of the arrow in the figure, the closing portion 73 narrows the lumen 31 of the outer needle hub 3 (see FIG. 3). While maintaining this state, the inner needle hub 5 is moved to the proximal end side. And
Almost simultaneously with the passage of the needle tip 41 through the portion of the lumen 31 narrowed by the closing portion 73, the portion is closed.
Thereby, for example, the outer needle 2 is connected to a blood vessel (vein or artery).
When the blood is punctured, the flow of the blood flowing from the distal end opening 21 of the outer needle 2 is blocked, and the blood is prevented from flowing out from the proximal opening of the outer needle hub 3.

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, the inner needle 4 and the outer needle 2 are punctured into a blood vessel (vein or artery) of the patient.

When the needle 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.

Note that, 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] The distal ends of both operation member main bodies 71 are pinched and pressed with fingers so that the closing portion 73 approaches the outer needle hub 3 (in the direction of the arrow in FIG. 2). As a result, the engaging portion 72 is separated from the outer portion 52 of the inner needle hub 5, and the engaging portion 72 and the outer portion 5 are separated.
The engagement with the second flange 521 is released.

[4] Further, the distal ends of both operation member main bodies 71 are gripped with fingers, and the outer needle hub 3 having elasticity is pressed from the outside. As a result, the outer needle hub 3 is deformed so that the portion in contact with the closing portion 73 is narrowed inward, and the inner cavity portion 31 is formed.
Is constricted (see FIG. 3).

At this time, the closed portion 73 of the lumen 31
The inner surface of the portion narrowed by the abutment or approaching to the outer peripheral surface of the inner needle 4.

[5] While maintaining the state of step [4],
With the other hand, the outer part 52 of the inner needle hub 5 is gripped and pulled toward the protector 6 in the proximal direction (see FIG. 3). 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. At this time, the protector 6 is maintained in a state of being fitted to the outer needle hub 3.

[6] The inner needle hub 5 is further moved in the proximal direction, and when the needle tip 41 of the inner needle 4 passes through the portion of the lumen 31 narrowed by the closing portion 73, almost simultaneously with the closing portion 73.
Closes the part. This prevents the blood that has flowed into the outer needle hub 3 via the outer needle 2 from flowing out from the proximal end opening of the outer needle hub 3.

[7] When the inner needle hub 5 is further pulled in the proximal direction, the connecting portion 53 comes into contact with the proximal inner surface 612 of the groove 61, and the protector 6 is pulled in the proximal direction together with the inner needle hub 5. Thus, the needle tip 41 is housed in the protector 6, and the protector 6 fitted to the outer needle hub 3 is removed from the outer needle hub 3 (see FIG. 4).

[8] The outer needle hub 3 of the outer needle 2 from which the inner needle 4 has been removed loosens the finger that has pinched the distal end sides of both operation member main bodies 71, and fills the outer needle hub 3 with an appropriate amount of blood. After
Connect a connector or the like (not shown) of the infusion set. At the time of connection, when the fingers pinching the distal end sides of both operation member main bodies 71 are released, the outer needle hub 3 returns to its original shape due to its own elasticity, and the inner cavity 31 is opened. Thereafter, administration of the infusion is started according to a standard method.

Note that the engaging portion 7 is connected to the connector of the infusion set or the like.
When a connector having a structure capable of engaging with the outer needle hub 3 (for example, a structure similar to the flange 521) is used, the structure and the engaging portion 72 are connected with the outer needle hub 3 connected thereto. Can be more effectively prevented from coming off the outer needle hub 3 such as the connector.

[9] 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.

With the needle tip 41 housed in the protector 6, the inner needle hub 5 is rotated in the circumferential direction of the protector 6, and then moved toward the distal end by a predetermined distance. As a result, the connecting portion 53 passes through the groove 62 and abuts on the inner surface 621 on the distal end side of the groove 62, so that the movement of the connecting portion 53 in the circumferential direction and the longitudinal direction of the protector 6 is restricted. At this time,
The needle tip 41 is located near the base end of the fitting portion 63 of the protector 6.

In this state, the inner needle hub 5 is prevented from moving in the circumferential direction and the longitudinal direction of the protector 6 by the operation of the maintaining means. Therefore, since the needle tip 41 does not protrude from the tip of the protector 6, it is possible to prevent an accident such as a person who performs disposal processing accidentally stabbing a finger or the like with the needle tip 41.

FIG. 7 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. 7 will be described focusing on differences from the first embodiment, and the description of the same matters will be omitted.

In the indwelling needle assembly 1 of the second embodiment, an area (closed area) 32 is provided in the middle of the outer needle hub 3. The region 32 is a portion where the closing portion 73 contacts and a portion in the vicinity thereof. The region 32 is deformed by being pressed by the closing portion 73, and the lumen 31 is closed.

The region 32 is made of a material having elasticity (flexibility), and other portions (portions other than the region 32)
Is made of a resin having relatively high hardness.

As a constituent material of the region 32, the same constituent material as that of the outer needle hub 3 in the first embodiment can be used. On the other hand, the constituent material of the other parts (the part other than the region 32) is not particularly limited, and for example, the same constituent material as that of the inner needle hub 5 in the first embodiment can be used.

FIG. 8 is a longitudinal sectional view showing a third embodiment of the indwelling needle assembly 1 of the present invention. Hereinafter, the indwelling needle assembly 1 shown in FIG. 8 will be described focusing on the differences from the first embodiment and the second embodiment.
The description is omitted.

In the indwelling needle assembly 1 of the third embodiment, the outer needle hub 3 has the same region (clamping region) as that of the second embodiment.
32, and the end of the closing portion 73 is fixed to the outer peripheral surface of the region 32.

In such an indwelling needle assembly 1, the lumen 3
The operation of closing 1 by the closing portion 73 is the same as that of the first embodiment and the second embodiment, but the operation of opening the closed lumen 31 is different. That is, the closing portion 73
In a state in which the lumen portion 31 is closed, by gripping the base end sides of both the operating member main bodies 71 with fingers, the two operating member main bodies 71 are rotated so that the closed portions 73 are separated from each other, The lumen portion 31 of the closed region 32 can be forcibly expanded and opened.

Therefore, the region 32 may be made of a material having flexibility but poor elasticity.

As a constituent material of such a region 32,
In addition to the same constituent materials as those of the outer needle hub 3 in the first embodiment, for example, flexible resin materials such as soft polyvinyl chloride and polyethylene, and easily deformable metal materials such as aluminum foil Etc. can be used.

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. Each part constituting the indwelling needle assembly exhibits the same function. Any configuration that can be used can be substituted.

In the present invention, the shape of the protector 6 is not particularly limited. For example, the protector 6 may cover only the periphery of the needle tip 41.

The indwelling needle assembly 1 according to the present invention may be such that the protector 6 is omitted.

[0120]

As described above, according to the present invention, it is possible to provide an indwelling needle assembly which is excellent in operability such as puncturing a blood vessel and connecting an infusion line. In particular, leakage of blood from the outer needle hub can be prevented, which is advantageous in terms of hygiene.

Furthermore, the tip of the used inner needle can be stored in 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. In particular, when the protector is provided with a maintenance means capable of maintaining the state in which the needle tip is stored, it is possible to more reliably prevent the needle tip once stored from protruding from the tip of the protector. For this reason, the effect is further enhanced.

[Brief description of the drawings]

FIG. 1 is a plan 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 first embodiment of the indwelling needle assembly of the present invention.

FIG. 5 is a sectional view taken along line AA in FIG. 2;

FIG. 6 is a sectional view taken along line BB in FIG. 2;

FIG. 7 is a longitudinal sectional view showing a second embodiment of the indwelling needle assembly of the present invention.

FIG. 8 is a longitudinal sectional view showing a third 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 lumen 32 area (clamping closed area) 4 inner needle 41 needle tip 5 inner needle hub 51 main body 511 projecting part 52 exterior part 521 flange 53 connecting part 54 filter member 6 protector 61 groove 611 distal inner surface 612 proximal inner surface 62 groove 621 distal inner surface 63 fitting part 7 operating member 71 operating member main body 72 engaging part 73 closing part 74 supporting part

Claims (13)

[Claims] An outer needle hub having an inner cavity; a hollow outer needle fixed to the outer needle hub; an inner needle hub; fixed to the inner needle hub and insertable into the outer needle. An inner needle; a protector movable relative to the inner needle hub and capable of accommodating at least a needle tip of the inner needle; and an engagement disposed on the outer needle hub and engageable with the inner needle hub. And an at least one operation member including a closing portion capable of closing a middle of a lumen portion of the outer needle hub. The operation member includes the engaging portion, the inner needle hub, The indwelling needle assembly is characterized in that the operation of releasing the engagement of the outer needle hub and the operation of closing the outer needle hub by the closing portion can be performed substantially simultaneously or continuously. . 2. The indwelling device according to claim 1, wherein the inner needle hub has a main body portion inserted into the protector, and an exterior portion outside the protector, and these are connected via a connecting portion. Needle assembly. 3. The protector according to claim 2, wherein the protector has a groove formed in a longitudinal direction thereof, and the inner needle hub moves relative to the protector when the connecting portion moves along the groove. The indwelling needle assembly according to any one of the preceding claims. 4. The indwelling needle assembly according to claim 2, wherein a filter member that allows gas to permeate but does not allow liquid to pass therethrough is provided at a base end of the main body. 5. The indwelling needle assembly according to claim 2, wherein the exterior portion engages with the engagement portion. 6. The indwelling needle assembly according to claim 1, wherein said protector has a maintenance means capable of maintaining a state in which a needle tip of said inner needle is housed. 7. The indwelling needle assembly according to claim 6, wherein the maintaining means is configured to restrict movement of the inner needle hub in a distal direction of the protector. 8. The indwelling needle assembly according to claim 1, wherein the protector has a fitting portion capable of fitting with the outer needle hub. 9. An outer needle hub having a lumen, a hollow outer needle fixed to the outer needle hub, an inner needle hub, fixed to the inner needle hub, and insertable into the outer needle. At least one of: an inner needle; an engaging portion provided on the outer needle hub, the engaging portion being engageable with the inner needle hub; and a closing portion capable of closing a middle of a lumen of the outer needle hub. Operating member, the operation member, the operation of disengaging the engagement portion and the inner needle hub, and the operation of closing the outer needle hub by the closing portion, substantially simultaneously or An indwelling needle assembly characterized in that it can be continuously operated. 10. The operating member is supported by the outer needle hub at a support portion, and the engaging portion and the closing portion are configured to rotate around the support portion. The indwelling needle assembly according to any one of the above. 11. The indwelling needle assembly according to claim 1, wherein the operation members are provided in pairs opposite to each other via a center axis of the outer needle hub. 12. The outer needle hub according to claim 1, wherein the operation of closing the outer needle hub is performed by closing a portion of the outer needle hub contacting the closing portion from the outside of the portion. Indwelling needle assembly. 13. The outer needle hub has flexibility at least at a portion where the closing portion abuts.
3. The indwelling needle assembly according to any one of 2.