JP2002058746A - Indwelling needle assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an indwelling needle assembly which enables easy and accurate accomplishment of the operations in pulling off an inner needle from an outer needle, housing the tip of the inner needle into a protector and taking off the protector the outer needle hub. SOLUTION: The indwelling needle assembly 1 is provided with an outer needle 4 with a hub made up of an outer needle 2 as an indwelling needle and an outer needle hub 3, an inner needle 7 with a hub made up of an inner needle 7 used being inserted into the outer needle 2 and an inner needle hub 6, a protector 8 covering the tip 51 of the inner needle 5, a shutter member 85 set on the protector 8 and an engaging means for checking the separation of the protector 8 from the needle tip 51. The joint force between the protector 89 and the outer needle hub 3 is so set as to be larger than the friction force between the protector 8 and the inner needle 5 when the inner needle 5 is pulled off the outer needle 2. When the protector 8 engages the inner needle 5, the engaging force between the protector 8 and the inner needle 5 is preferably set to be larger as compared with the joint force between the protector 8 and the outer needle hub 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an indwelling needle assembly. More specifically, for example, the present invention relates to an indwelling needle assembly used to puncture a blood vessel at the time of infusion or blood collection.

[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.

Further, there has been proposed such an indwelling needle provided with a protector capable of covering the needle tip of the inner needle. Thus, when discarding the inner needle extracted from the outer needle, 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.

When puncturing the indwelling needle into a patient's blood vessel, the inner needle is inserted into the outer needle, and a puncturing operation is performed with the needle tip of the inner needle protruding from the tip of the outer needle. In this state, the outer needle hub and the distal end of the protector are fixed by fitting.

When the tip of the inner needle reaches the inside of the blood vessel, the blood flowing from the opening of the needle passes through the inner lumen of the inner needle and flows into the transparent inner needle hub (flashback). Thereby, it can be confirmed that the inner needle has secured the blood vessel.

After confirming the flashback, the inner needle and the outer needle are slightly advanced, and the tip of the outer needle is inserted into the blood vessel. Next, while grasping the outer needle or the outer needle hub by hand, the inner needle hub is moved in the proximal direction, and the inner needle is removed from the outer needle. At about the same time, the tip of the inner needle is stored in the protector.

[0007] Thereafter, the protector is removed from the outer needle hub, and the connector of the infusion line is connected to the outer needle hub.
Administration of the infusion is started.

However, in the conventional indwelling needle, the fitting strength (fitting force) between the outer needle hub and the protector is set to be higher in order to prevent the outer needle hub and the protector from accidentally coming off. Was.

For this reason, for example, when the protector is removed from the outer needle hub, the fitting between the outer needle hub and the protector cannot be easily released, and the operability is reduced.

[0010] In the conventional indwelling needle, when the proximal end portion of the outer needle hub and the protector are fitted to each other, the outer peripheral surface of a flange protruding in a ring shape at the base end of the outer needle hub;
The configuration is such that the inner surface of the fitting portion formed to protrude toward the outside of the protector is pressed. For this reason, such an indwelling needle has a large outer diameter on the distal end side, and again, for example, when removing the protector from the outer needle hub, the operability is reduced.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to perform, for example, an operation of extracting an inner needle from an outer needle, an operation of storing a needle tip of an inner needle in a protector, an operation of removing a protector from an outer needle hub, and the like. An object of the present invention is to provide an indwelling needle assembly that can be easily and reliably performed.

[0012]

This and other objects are achieved by the present invention which is defined below as (1) to (27).

(1) An inner needle hub, an inner needle fixed to the distal end side of the inner needle hub, and a protector that is installed so as to be movable relative to the inner needle and covers at least a tip of the inner needle. An outer needle hub joined to the distal end side of the protector, and a hollow outer needle fixed to the distal end side of the outer needle hub and through which the inner needle is inserted, wherein the protector and the outer needle hub An indwelling needle assembly, wherein a joining force between the protector and the inner needle when the inner needle is pulled out from the outer needle is greater than a frictional force between the protector and the inner needle when the inner needle is pulled out from the outer needle.

(2) The indwelling needle assembly according to the above (1), wherein a joining force between the protector and the outer needle hub can be released by a force of 0.06 kgf or less.

(3) Inserting the inner needle into the outer needle,
(1) or the above (1) or wherein the connection between the protector and the outer needle hub is maintained when an operation of pulling out the inner needle from the outer needle is performed in a state where the protector and the outer needle hub are connected. The indwelling needle assembly according to (2).

(4) The connection between the protector and the outer needle hub by the fitting of the protector and the outer needle hub as described in any one of (1) to (3) above. Indwelling needle assembly.

(5) The above-mentioned (1) having a joining force adjusting means for adjusting a joining force between the protector and the outer needle hub.
The indwelling needle assembly according to any one of (1) to (4).

(6) The indwelling needle set according to the above (5), wherein the joining force adjusting means is constituted by a large number of minute projections formed at a contact portion where the protector and the outer needle hub come into contact. Three-dimensional.

(7) The indwelling needle assembly according to the above (6), wherein the minute convex portion is formed by roughening the contact portion.

(8) The indwelling needle set according to the above (5), wherein the joining force adjusting means comprises at least one convex portion formed at a contact portion where the protector and the outer needle hub come into contact. Three-dimensional.

(9) The indwelling needle assembly according to (8), wherein the projection is a rib.

(10) The indwelling needle assembly according to the above (5), wherein the joining force adjusting means is formed by forming a contact portion where the protector and the outer needle hub come into contact with each other with an elastic material.

(11) The indwelling needle assembly according to the above (5), wherein the joining force adjusting means is formed by forming a contact portion between the protector and the outer needle hub with an adhesive material.

(12) There is provided a cover member for joining the protector and the outer needle hub, and the cover member covers the vicinity of the boundary between the protector and the outer needle hub. The indwelling needle assembly according to any one of 3).

(13) The indwelling needle assembly according to the above (12), wherein the cover member is a heat-shrinkable or sticky sheet-like member.

(14) The indwelling needle assembly according to the above (12) or (13), further comprising a coating release assisting means for assisting release of the coating near the boundary by the cover member.

(15) The indwelling needle assembly according to (14), wherein the cover release assisting means is a perforation formed in the cover member.

(16) An inner needle hub, an inner needle fixed to the distal end side of the inner needle hub, and a protector which is installed so as to be movable relative to the inner needle and covers at least a tip of the inner needle. An outer needle hub joined to the distal end side of the protector, and a hollow outer needle fixed to the distal end side of the outer needle hub and through which the inner needle is inserted. A proximal end having an outwardly projecting flange portion, wherein the protector has at least one outwardly projecting portion, and when the protector and the outer needle hub are joined, the flange portion An indwelling needle assembly wherein the and the protruding portion do not interfere with each other.

(17) The indwelling needle assembly according to the above (16), wherein when the protector and the outer needle hub are joined, a cutout portion into which the protrusion is inserted is formed in the flange portion. .

(18) The notch is an inclined groove formed in the flange so as to be inclined at a predetermined angle with respect to the axis of the outer needle hub when viewed in a plan view, and the protrusion is formed in the inclined groove. The indwelling needle assembly according to the above (17), wherein the insertion strength of the protector and the outer needle hub is obtained by being inserted.

(19) The indwelling needle according to the above (16) or (17), wherein the joint between the protector and the outer needle hub is obtained by fitting the projecting portion into the outer needle hub. Assembly.

(20) The projecting portion is elastically deformable, and the projecting portion engages with the flange portion of the outer needle hub, so that a joining force between the protector and the outer needle hub is obtained. The indwelling needle assembly according to the above (16), wherein

(21) Any of (16) to (20) above, wherein when the protector and the outer needle hub are joined, the outer edge of the protruding portion does not exceed the outer edge of the flange portion. The indwelling needle assembly according to any of the preceding claims.

(22) The bonding force between the protector and the outer needle hub is greater than the frictional force between the protector and the inner needle when the inner needle is pulled out of the outer needle. 21. The indwelling needle assembly according to any one of 21).

(23) The indwelling needle according to any one of (16) to (22), wherein a joining force between the protector and the outer needle hub can be released with a force of 0.06 kgf or less. Assembly.

(24) When the inner needle is inserted into the outer needle and the operation of pulling out the inner needle from the outer needle in a state where the protector and the outer needle hub are joined to each other, the protector is removed. The indwelling needle assembly according to any one of the above (16) to (23), wherein the connection between the indwelling needle hub and the outer needle hub is maintained.

(25) The indwelling needle assembly according to any one of (1) to (24), further comprising an engagement means for preventing the protector from being detached from the needle tip of the inner needle.

(26) When the protector is engaged with the inner needle, the engaging force between the protector and the inner needle is:
The indwelling needle assembly according to the above (25), which is larger than a bonding force between the protector and the outer needle hub.

(27) The indwelling needle according to any one of (1) to (26), wherein the protector includes a shutter member that prevents a tip of the inner needle from passing in a distal direction. Assembly.

[0040]

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.

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

The indwelling needle assembly (puncture needle assembly) 1 shown in FIGS. 1 and 2 includes an outer needle and an inner needle.
An indwelling needle assembly for infusion, comprising an outer needle 2 which is an indwelling needle, and an outer needle hub 3 provided at a base end of the outer needle 2
And a hub constituted by an inner needle 5 used by being inserted into the outer needle 2 and an inner needle hub 6 provided at the base end of the inner needle 5. An inner needle 7 and a protector 8 that covers the needle tip 51 of the inner needle 5 are provided. 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 soft resins such as tetrafluoroethylene copolymer (ETFE), polyurethane, and polyether nylon resin are preferred.

All or a part of the outer needle 2 may have internal visibility. Further, an X-ray contrast agent such as barium sulfate or barium carbonate may be blended in 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 puncture the living body with low invasiveness.

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 communicates with the inside of the outer needle hub 3. The outer needle hub 3 is a substantially cylindrical member, and has a tapered shape whose outer diameter and inner diameter gradually increase toward the base end. The tapered portion is fitted to the distal end side of a protector 8 described later, whereby the protector 8 and the outer needle hub 3 are joined.

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 2 is fixed to the outer needle hub 3 by a method such as caulking, fusion (heat fusion, high frequency fusion, or the like), bonding with an adhesive, or the like.

The inner needle 5 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 51 is formed at the tip of the inner needle 5. The shape of the needle tip 51 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 5.

The inner needle 5 is inserted into the lumen of the outer needle 2,
Further, it is used in a state where the protector 8 and the outer needle hub 3 are fitted (joined), that is, in a state shown in FIG. Less than,
This state is called an “assembled state”.

The length of the inner needle 5 is such that at least the needle tip 51 protrudes from the distal end opening 21 of the outer needle 2 when assembled.

The proximal end of the inner needle 5 is fixed to the distal end of the inner needle hub 6, and the lumen of the inner needle 5 communicates with the inner space of the inner needle hub 6. The inner needle hub 6 is formed of a substantially cylindrical hollow member.

The method for fixing the inner needle 5 to the inner needle hub 6 is as follows.
For example, a method such as fitting, caulking, fusion, or bonding with an adhesive, or a method using these in combination is exemplified.

The inner needle hub 6 is preferably made of a transparent (colorless and transparent), colored transparent or translucent resin, and the internal visibility is secured. Thus, when the needle tip 51 secures a blood vessel, it is possible to visually check the flashback of the blood flowing through the inner needle 5.

A flange 61 is provided on the outer periphery of the distal end of the inner needle hub 6.
Are formed. For example, when the operation of pulling out the inner needle 5 from the outer needle 2 is performed by hooking a finger on the flange 61 and performing this operation, this operation can be performed more reliably.

A ventilation filter 62 is provided at an opening on the base end side of the inner needle hub 6 so as to cover the opening. The ventilation filter 62 has a property of transmitting gas but blocking liquid.

Specific examples of the ventilation filter 62 include various sintered porous bodies, hydrophobic non-woven fabrics, and other porous bodies. In this case, as the sintered porous body, 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.

A recess 63 is provided on the distal end surface of the inner needle hub 6.
Are formed. The concave portion 63 has a function as a clearance hole into which the engaging member 92 is inserted when the distal end surface of the inner needle hub 6 and the proximal end surface of the protector 8 come into contact with each other.

The constituent materials of the outer needle hub 3, the inner needle hub 6, and the protector body 81 described later are not particularly limited, and are, for example, polyolefins such as polyethylene, polypropylene, polybutadiene, and ethylene-vinyl acetate copolymer, respectively. Polyester such as vinyl chloride, polyurethane, polystyrene, polymethyl methacrylate, polycarbonate, polyamide, polyethylene terephthalate, polybutylene terephthalate, acrylic resin, A
BS resin, AS resin, ionomer, polyacetal,
Various resin materials such as polyphenylene sulfide and polyether ether ketone are exemplified.

The protector 8 has a protector body 81 composed of a substantially cylindrical member, and a shutter member (shutter means) 85 described later. A needle passage 82 through which the inner needle 5 is inserted is provided at the center of the protector body 81.
Are formed to penetrate from the base end to the front end of the protector main body 81.

The cross-sectional shape of the needle passage 82 is circular, and the inner diameter of the needle passage 82 is equal to the outer diameter of the inner needle 5.
Or it is set to a slightly larger value.

Further, inside the protector main body 81, that is, in the middle of the needle body passage 82, a space 83 in which the diameter of the needle body passage 82 is enlarged is formed. In this space 83, a shutter member 85 described later is stored.

The distal end of the protector body 81 has a tapered shape whose outer diameter gradually decreases toward the distal end, and is fitted to the outer needle hub 3. Thereby, the joining force between the protector 8 and the outer needle hub 3 is obtained.

The joining force between the protector 8 and the outer needle hub 3 is determined by the frictional force between the protector 8 and the inner needle 5 when the inner needle 5 is pulled out from the outer needle 2 (in this embodiment, mainly the inner force). Needle 5
(The sum of the frictional force between the outer peripheral surface of the needle member 82 and the inner surface of the needle body passage 82 and the shutter member 85).

With such a configuration, the following operations and effects are produced. That is, from the assembled state of the indwelling needle assembly 1, when the outer needle 2 or the outer needle hub 3 (the outer needle 4 with a hub) is gripped (fixed) and the inner needle hub 6 is moved toward the base end, the protector is moved. The protector 8 moves in a direction away from the inner needle hub 6 with the joint (fitting) between the outer needle hub 8 and the outer needle hub 3 maintained. For this reason, the protector 8 can easily and reliably house the needle tip 51 of the inner needle 5.

The joining force between the protector 8 and the outer needle hub 3 is not particularly limited, but is preferably, for example, releasable with a force of about 0.06 kgf or less.
More preferably, it can be released with a force of about 0.06 kgf. By setting the joining force between the protector 8 and the outer needle hub 3 within the above range, the outer needle hub 3 and the protector 8 can be reliably removed when necessary while maintaining the above-described effects. For this reason, for example, the operability in the operation of connecting the connector or the like of the infusion set to the outer needle hub 3 is improved.

The proximal end of the protector body 81 is exposed from the outer needle hub 3. The exposed portion 81a has a substantially columnar shape, and has a length that can be gripped by hand.

The base end of the protector body 81 is connected to the inner needle hub 6.
And a simple contact with the tip of the head.

The shutter member 85 has a function of preventing the needle tip 51 of the inner needle 5 located on the proximal side from the space 83 from passing in the distal direction. The shutter member 85 is formed of a plate-shaped elastic piece bent in a dogleg shape.

The shutter member 85 has a first position (position shown in FIG. 1) in which the inner needle 5 can be inserted (penetrated) through the needle body passage 82 by changing a bending angle, and a needle point of the inner needle 5. It is deformed (displaced) to a second posture (posture shown in FIG. 2) that blocks the passage of 51.

The shutter member 85 is in the first position,
One end thereof is in contact with the outer peripheral surface of the inner needle 5. Further, in the second posture, it spreads in the space 83 (the bending angle increases), and prevents the needle point 51 from passing therethrough.

The constituent material of the shutter member 85 is the needle tip 5
Any material can be used as long as it can block the passage of 1, for example, polyethylene, polypropylene, polybutadiene, polyolefins such as ethylene-vinyl acetate copolymer, polyvinyl chloride, polyurethane, polystyrene, polymethyl methacrylate, polycarbonate, Polyester such as polyamide, polyethylene terephthalate, polybutylene terephthalate, acrylic resin, A
BS resin, AS resin, ionomer, polyacetal,
Examples include various resin materials such as polyphenylene sulfide and polyether ether ketone, and various metal materials such as stainless steel, aluminum alloy, copper or copper-based alloy, titanium and titanium alloy.

A concave portion 91 is formed on the outer peripheral surface at a position of a predetermined length from the tip of the inner needle 5. At the base end of the protector body 81, an elastically deformable engaging member 92 is formed so as to protrude. The inner needle 5 is attached to an end of the engagement member 92.
Is formed with a claw 93 that engages with the concave portion 91 formed in the second member.

The recess 91 and the engaging member 92 constitute an engaging means for preventing the protector 8 from being detached from the needle tip 51 when the protector 8 covers the needle tip 51.

When this engagement means is activated, that is,
When the claw 93 is inserted into the concave portion 91 and the protector 8 engages with the inner needle 5, the engaging force between the protector 8 and the inner needle 5 is larger than the joining force between the protector 8 and the outer needle hub 3. Is set.

With such a configuration, the following operations and effects are produced. In other words, when the outer needle 2 or the outer needle hub 3 is gripped (fixed) from the state where the protector 8 is engaged with the inner needle 5 and the inner needle hub 6 is further moved in the proximal direction, the inner needle 5 The protector 8 engaged is
It moves toward the base end together with the inner needle 5 and the inner needle hub 6 (the inner needle 7 with a hub), and is surely separated from the outer needle hub 3. Therefore, the connection between the protector 8 and the outer needle hub 3 is easily and reliably released. That is, the protector 8 is easily and reliably removed from the outer needle hub 3.

In such an indwelling needle assembly 1, by pulling out the inner needle 7 with the hub, the inner needle 5 is removed from the outer needle 2, the needle tip 51 is stored in the protector 8, and the protector 8 and the outer needle There is an advantage that a series of operations of releasing the connection with the hub 3 can be completed.

Next, an example of a method of using the indwelling needle assembly 1 will be described in detail. [1] With the indwelling needle assembly 1 in the assembled state, the inner needle 5 and the outer needle 2 are punctured into a patient's blood vessel (vein or artery) while holding the inner needle hub 6 and the like by hand.

[2] When the needle tip 51 of the inner needle 5 is punctured into a blood vessel, the blood flows backward in the inner needle 5 due to the internal pressure (blood pressure) of the blood vessel and is introduced into the inner needle hub 6. This flashback can be visually recognized through the inner needle hub 6 having visibility. This makes it possible to know that the needle tip 51 of the inner needle 5 has secured a blood vessel.

Note that with the inflow of the blood, the inner needle hub 6
The air inside is exhausted through the ventilation filter 62,
Blood cannot pass through the ventilation filter 62 and does not leak to the outside.

[3] When the inner needle 5 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.

[4] While holding the outer needle 2 or the outer needle hub 3 (outer needle 4 with hub) placed in the blood vessel by hand,
Hold the inner needle hub 6 with the other hand and pull in the proximal direction.
Thereby, the inner needle 5 is withdrawn from the outer needle 2. In addition,
At this time, the protector 8 is fitted (joined) with the outer needle hub 3.
State is maintained.

[5] By the above step [4], the inner needle 5
Moves in the proximal direction from the position in the assembled state, but until the needle tip 51 of the inner needle 5 passes through the space 83 inside the protector 8, the shutter member 85 maintains the first posture, One end thereof contacts the outer peripheral surface of the inner needle 5 (FIG. 1).
reference).

[6] When the inner needle 5 further moves in the proximal direction and the needle point 51 passes through the space 83, the shutter member 85 is opened in the space 83 by its own elastic force, and one end of the shutter member 85 is opened. 83 contacts the bottom. As a result, the shutter member 85 assumes the second posture (see FIG. 2).

As described above, when the shutter member 85 is in the second position, even if the needle tip 51 attempts to move back to the distal end direction, the needle tip 51 contacts the shutter member 85 and cannot return. (See FIG. 2).

[7] When the needle tip 51 passes through the space 83 and the shutter member 85 is in the second position, the claw 93 of the engaging member 92 is substantially simultaneously with the concave portion 91 formed in the inner needle 5. And engaged (see FIG. 2). Thus, after the protector 8 covers the needle tip 51, the protector 8 is prevented from being detached (separated) from the needle tip 51 of the inner needle 5. At this time, the protector 8 is connected to the outer needle hub 3.
The state of fitting (joining) is maintained.

[8] In the state of the step [7], when the inner needle hub 6 is further moved in the proximal direction, the protector 8 engaged with the inner needle 5 is moved to the inner needle 5 and the inner needle hub. 6
(Inner needle 7 with hub) moves toward the proximal end. Thereby, the protector 8 and the outer needle hub 3 are separated. That is, the inner needle 7 with a hub whose needle tip 51 is covered with the protector 8 and the outer needle 4 with a hub are separated.

[9] A connector or the like (not shown) of an infusion set is quickly connected to the outer needle hub 3 of the outer needle 4 with the hub from which the inner needle 5 has been removed, and administration of the infusion is started according to a standard method. .

After the inner needle 5 is extracted from the outer needle 2 in this manner, the inner needle 7 with a hub becomes unnecessary, and is therefore disposed of. The inner needle 7 with the hub has the needle tip 51 covered with the protector 8, and in particular, the needle tip 51 moves beyond the shutter member 85 to the distal end side, and the protector 8
Since the needle tip 51 does not protrude from the tip of the needle or the needle tip 51 moves in the proximal direction and the protector 8 does not come off, an accident such as a person who performs disposal processing accidentally stabs a finger or the like with the needle tip 51 may occur. Is prevented.

<Second Embodiment> Next, a second embodiment of the indwelling needle assembly of the present invention will be described.

FIG. 3 is a perspective view showing the configuration of the distal end side of the indwelling needle assembly according to the second embodiment. FIG. 4 is a longitudinal sectional view illustrating a configuration near a protector included in the indwelling needle assembly according to the second embodiment. Hereinafter, the indwelling needle assembly 1 shown in FIGS. 3 and 4 will be described focusing on the differences from the first embodiment, and the description of the same items will be omitted.

In the indwelling needle assembly 1 of the second embodiment, the structure of the protector body 81 is different from that of the first embodiment, and has a joint force adjusting means for adjusting the joint force between the protector 8 and the outer needle hub 3. ing.

The joining force adjusting means is provided on the protector body 8.
1 is formed on the outer peripheral surface on the distal end side (a contact portion on the protector 8 side where the protector 8 and the outer needle hub 3 come into contact) with four small piece-shaped convex portions 86 protruding outward. I have.

These convex portions 86 are provided on the protector main body 81.
The outer surfaces (upper surfaces) are pressed against the inner peripheral surface of the outer needle hub 3, respectively, and the protector 8 and the outer needle hub 3 are fitted.

The number of projections 86 is not limited to the number shown in the figure, but may be, for example, one to three, or five or more. That is, at least one projection 86 may be provided. When a plurality of protrusions 86 are installed, the installation positions are not limited to those shown in the figure. For example, they may be installed side by side in the longitudinal direction of the protector body 81, or the protector body 8
One may be installed spirally.

Also, instead of the outer peripheral surface on the distal end side of the protector body 81, the convex portion 86 is provided on the inner peripheral surface on the proximal end side of the outer needle hub 3 (the outer needle hub 3 where the protector 8 and the outer needle hub 3 come into contact with each other). Side contact portion), and may be provided both on the outer peripheral surface on the distal end side of the protector main body 81 and on the inner peripheral surface on the proximal end side of the outer needle hub 3.

<Third Embodiment> Next, a third embodiment of the indwelling needle assembly of the present invention will be described.

FIG. 5 is a perspective view showing the configuration of the distal end side of the indwelling needle assembly according to the third embodiment. FIG. 6 is a longitudinal cross-sectional view showing a configuration near a protector included in the indwelling needle assembly according to the third embodiment. Hereinafter, the indwelling needle assembly 1 shown in FIGS. 5 and 6 will be described focusing on the differences from the first and second embodiments, and the description of the same matters will be omitted.

The indwelling needle assembly 1 of the third embodiment has a joining force adjusting means, but the form is different from that of the second embodiment.

That is, the indwelling needle assembly 1 of the third embodiment
Here, the joining force adjusting means is constituted by four rectangular parallelepiped ribs 87 formed on the outer peripheral surface on the distal end side of the protector body 81 so as to protrude outward.

These ribs 87 are attached to the protector body 81.
The outer surfaces (upper surfaces) are pressed against the inner peripheral surface of the outer needle hub 3, respectively, and the protector 8 and the outer needle hub 3 are fitted.

The number of the ribs 87 is not limited to the number shown in the figure. For example, one to three or five or more ribs may be provided. That is, at least one rib 87 may be provided. Also, the rib 87
Are not limited to those provided linearly along the longitudinal direction of the protector main body 81. For example, those provided in a ring shape along the circumferential direction of the protector main body 81, and those installed spirally with respect to the protector main body 81 Any of these may be used. Furthermore, you may install so that each rib 87 may intersect.

The rib 87 is provided on the inner peripheral surface on the base end side of the outer needle hub 3 instead of the outer peripheral surface on the distal end side of the protector main body 81 (the outer needle hub 3 side where the protector 8 contacts the outer needle hub 3). May be provided on both the outer peripheral surface on the distal end side of the protector main body 81 and the inner peripheral surface on the proximal end side of the outer needle hub 3.

<Fourth Embodiment> Next, a fourth embodiment of the indwelling needle assembly of the present invention will be described.

FIG. 7 is a perspective view showing the configuration of the distal end side of the indwelling needle assembly according to the fourth embodiment. FIG. 8 is a longitudinal sectional view showing a configuration near a protector included in the indwelling needle assembly according to the fourth embodiment. Hereinafter, the indwelling needle assembly 1 shown in FIGS. 7 and 8 will be described focusing on differences from the first and second embodiments, and the description of the same items will be omitted.

The indwelling needle assembly 1 of the fourth embodiment has a joining force adjusting means, but the form is different from that of the second embodiment.

That is, the indwelling needle assembly 1 of the fourth embodiment
In the embodiment, the joining force adjusting means is constituted by a large number of minute projections (rough surfaces) 88 formed on the outer peripheral surface on the distal end side of the protector body 81.

The tops of these minute projections 88 are in pressure contact with the inner peripheral surface of the outer needle hub 3, respectively, and the protector 8 and the outer needle hub 3 are fitted.

The minute projections 88 can be formed not only by transfer from a mold, but also by roughening such as sand blasting, shot blasting and etching.

Further, the minute projection 88 is provided on the protector body 8.
1 may be provided on the inner peripheral surface on the base end side of the outer needle hub 3 (the contact portion on the outer needle hub 3 side where the protector 8 and the outer needle hub 3 are in contact) instead of the outer peripheral surface on the distal end side. It may be provided on both the outer peripheral surface on the distal end side of the main body 81 and the inner peripheral surface on the proximal end side of the outer needle hub 3.

<Fifth Embodiment> Next, a fifth embodiment of the indwelling needle assembly of the present invention will be described.

FIG. 9 is a longitudinal sectional view showing the structure near the protector provided in the indwelling needle assembly according to the fifth embodiment. Hereinafter, the indwelling needle assembly 1 shown in FIG. 9 will be described focusing on differences from the first and second embodiments, and the description of the same matters will be omitted.

Although the indwelling needle assembly 1 of the fifth embodiment has a joining force adjusting means, the form is different from that of the second embodiment.

That is, the indwelling needle assembly 1 of the fifth embodiment
In this embodiment, a close contact layer (contact portion) 84 is formed on the outer peripheral portion on the distal end side of the protector body 81, and the close contact layer 84 constitutes a joining force adjusting means.

The close contact layer 84 is made of a material having a higher coefficient of friction than the material of the protector body 81, for example, an elastic material or an adhesive material.

Examples of the elastic material include various rubber materials such as natural rubber, butyl rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, and silicone rubber, and polyurethane, polyester, polyamide, olefin, and styrene. And other resin materials such as thermoplastic elastomers and mixtures thereof. Further, as the form, a foam (porous body) such as sponge or porous polyurethane is preferable.

Examples of the adhesive material (adhesive) include an acrylic adhesive, a polyester adhesive, a urethane adhesive, and a rubber adhesive.

The adhesion layer 84 is provided on the protector body 81.
Instead of the outer peripheral portion on the distal end side, the inner peripheral portion on the proximal end side of the outer needle hub 3 (the outer needle hub 3 where the protector 8 contacts the outer needle hub 3).
Side contact portion), and may be provided on both the outer peripheral portion on the distal end side of the protector main body 81 and the inner peripheral portion on the proximal end side of the outer needle hub 3.

<Sixth Embodiment> Next, a sixth embodiment of the indwelling needle assembly of the present invention will be described.

FIG. 10 is a perspective view showing the configuration of the distal end side of the indwelling needle assembly according to the sixth embodiment. FIG. 11 is a longitudinal sectional view illustrating a configuration near a protector included in an indwelling needle assembly according to a sixth embodiment. Hereinafter, the indwelling needle assembly 1 shown in FIGS. 10 and 11 will be described focusing on the differences from the first embodiment, and the description of the same matters will be omitted.

In the indwelling needle assembly 1 of the sixth embodiment, the form of connection between the protector 8 and the outer needle hub 3 is different from that of the first embodiment.

That is, the protector main body 81 is formed with two (one pair) protrusions 89 projecting outward. These protruding portions 89 are installed substantially opposite to each other via the axis of the protector main body 81, and their inner surfaces are pressed against the outer peripheral surfaces of the proximal ends of the outer needle hubs 3 respectively. Are fitted. Thereby, the joining force between the protector 8 and the outer needle hub 3 is obtained. Such a bonding force is preferably the same as in the first embodiment.

The projecting portion 89 and the base end of the outer needle hub 3 each constitute a contact portion. These contact portions may be provided with the joining force adjusting means as shown in the second to fifth embodiments.

The number of such projections 89 is as follows.
It is not limited to the illustrated one, and three or more may be installed. Further, the projecting portion 89 may be formed in a ring shape (annular shape) so as to cover the entire circumference of the base end portion of the outer needle hub 3.

<Seventh Embodiment> Next, a seventh embodiment of the indwelling needle assembly of the present invention will be described.

FIG. 12 is a perspective view showing the configuration of the distal end side of the indwelling needle assembly according to the seventh embodiment. FIG. 13 is a vertical cross-sectional view showing a configuration near a protector included in the indwelling needle assembly according to the seventh embodiment. Hereinafter, the indwelling needle assembly 1 shown in FIGS. 12 and 13 will be described focusing on differences from the first and sixth embodiments, and the description of the same items will be omitted.

In the indwelling needle assembly 1 of the seventh embodiment, the protector 8 and the outer needle hub 3 are joined in the same manner as in the sixth embodiment, but the configuration of the proximal end of the outer needle hub 3 is different. ing.

That is, at the base end of the outer needle hub 3, a ring-shaped flange portion 31 protruding outward is formed. When such a flange portion 31 is provided, for example, when the operation of extracting the inner needle 5 from the outer needle 2 is performed by hooking a finger on the flange portion 31, this operation can be performed more reliably.

The flange 31 has two (a pair of) parallel grooves (notches) 32 formed substantially parallel to the axis of the outer needle hub 3 when viewed in a plan view. They are provided substantially opposite to each other via a shaft. When the protector 8 and the outer needle hub 3 are joined to each other, the protrusions 89 are inserted into these parallel grooves 32. That is, in such an indwelling needle assembly 1, the flange portion 31 and the protruding portion 89 do not interfere with each other.

In this state, the outer edge of the projection 89 is
It is configured not to exceed the outer edge of the flange portion 31.

Thus, an increase in the outer diameter at the distal end side of the indwelling needle assembly 1 is prevented, and the operability of the indwelling needle assembly 1 is improved, for example, when the protector 8 and the outer needle hub 3 are removed. It can be prevented from lowering.

Also, by adopting such a configuration,
There is also an effect of preventing (preventing) the outer needle hub 3 from rotating relative to the protector 8.

The installation position and the number of such parallel grooves (notches) 32 can be appropriately set according to the installation position and the number of the projections 89.

<Eighth Embodiment> Next, an indwelling needle assembly according to an eighth embodiment of the present invention will be described.

FIG. 14 is a plan view showing the configuration near the protector of the indwelling needle assembly according to the eighth embodiment. Hereinafter, FIG.
The indwelling needle assembly 1 shown in FIG.
The following description focuses on differences from the embodiment, and a description of similar items will be omitted.

The indwelling needle assembly 1 of the eighth embodiment differs from the seventh embodiment in the form of connection between the protector 8 and the outer needle hub 3.

That is, at the base end of the outer needle hub 3, a ring-shaped flange portion 31 protruding outward is formed at a predetermined angle with respect to the axis of the outer needle hub 3 when viewed in a plan view. An inclined groove (notch) 33 is provided.

On the other hand, the protector body 81 has
A projection 89a having a tapered portion 891a that is inclined substantially corresponding to 3 is formed.

When the protector 8 and the outer needle hub 3 are joined to each other, a tapered portion 891a is inserted into the inclined groove 33, whereby a joining force between the protector 8 and the outer needle hub 3 is obtained. .

It is preferable that the joining force between the protector 8 and the outer needle hub 3 is the same as in the first embodiment.

In such an indwelling needle assembly 1, the outer needle 2 or the outer needle hub 3 (the outer needle 4 with a hub) is changed from the assembled state.
Is gripped (fixed) and the inner needle hub 6 is moved in the proximal direction, so that the upper surface 892 a of the tapered portion 891 a contacts the upper surface 331 of the inclined groove 33. Thereby, the protector 8 moves in a direction away from the inner needle hub 6 in a state in which the joint between the protector 8 and the outer needle hub 3 is maintained,
The tip 51 of the inner needle 5 is stored.

Further, from the state where the protector 8 is engaged with the inner needle 5, the outer needle 2 or the outer needle hub 3 is gripped (fixed), and the inner needle hub 6 is rotated slightly (slightly) downward in FIG. When the tapered portion 891a is further moved in the proximal direction while being moved, the tapered portion 891a moves in the proximal direction along the inclined groove 33 and separates from the inclined groove 33. Thereby, the joint between the protector 8 and the outer needle hub 3 is released. That is, the protector 8 is removed from the outer needle hub 3.

<Ninth Embodiment> Next, a ninth embodiment of the indwelling needle assembly of the present invention will be described.

FIG. 15 is a perspective view showing the configuration of the distal end side of the indwelling needle assembly according to the ninth embodiment. FIG. 16 is a plan view showing the configuration near the protector of the indwelling needle assembly according to the ninth embodiment. Hereinafter, the indwelling needle assembly 1 shown in FIGS. 15 and 16 will be described focusing on differences from the first and seventh embodiments, and the description of the same matters will be omitted.

In the indwelling needle assembly 1 of the ninth embodiment, the form of connection between the protector 8 and the outer needle hub 3 is different from that of the seventh embodiment.

That is, the base end of the outer needle hub 3 is formed with a plate-like flange portion 34 protruding outward at a part in the circumferential direction.

On the other hand, the protector main body 81 has two (a pair) of elastically deformable projecting portions 8 projecting outward.
9b is formed.

When the protector 8 and the outer needle hub 3 are joined to each other, the tip portions 891b of these projecting portions 89b engage with the flange portions 34, respectively, whereby the joint between the protector 8 and the outer needle hub 3 is formed. Power is gained. Such a bonding force is preferably the same as in the first embodiment.

In such an indwelling needle assembly 1, the outer needle 2 or the outer needle hub 3 (the outer needle with hub 4)
Is gripped (fixed), and the inner needle hub 6 is moved in the proximal direction, the engagement of the distal end portion 891b with the flange portion 34 is maintained, that is, the protector 8 and the outer needle hub 3 are The protector 8 moves in a direction away from the inner needle hub 6 in a state where the bonding of
To store.

When the protector 8 is engaged with the inner needle 5, the outer needle 2 or the outer needle hub 3 is gripped (fixed), and the inner needle hub 6 is further moved in the proximal direction. The distal end portions 891b are pressed toward the distal end direction by the portion 34, and are gradually deformed so as to move away from each other (spread). In FIG. 16, the distance between the tips of the two protruding portions 89b is the width of the flange portion 34 (the length in the up-down direction in FIG. 16), as indicated by the alternate long and short dash line.
When they are almost equal to each other, a flange portion 3
4 passes from the proximal end toward the distal end. Thereby, the joint between the protector 8 and the outer needle hub 3 is released.
That is, the protector 8 is removed from the outer needle hub 3.

The protruding portion 89b is provided on the protector main body 8.
1 or one formed separately from the protector body 81.

When the projecting portion 89b is formed separately from the protector main body 81, the constituent material is the first material.
The same materials as those used for the shutter member 85 in the embodiment can be used.

<Tenth Embodiment> Next, a tenth embodiment of the indwelling needle assembly of the present invention will be described.

FIG. 17 is a perspective view showing the configuration of the distal end side of the indwelling needle assembly according to the tenth embodiment. Hereinafter, the indwelling needle assembly 1 shown in FIG. 17 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 tenth embodiment, the form of connection between the protector 8 and the outer needle hub 3 is different from that of the first embodiment.

That is, in the indwelling needle assembly 1 of the tenth embodiment, the vicinity of the boundary between the protector 8 and the outer needle hub 3 is covered with the ring-shaped cover member C. Thereby, the joining force between the protector 8 and the outer needle hub 3 is obtained. Such a bonding force is preferably the same as in the first embodiment.

As such a cover member C, for example, a sheet-like member having heat shrinkage, adhesiveness and the like can be used.

Further, perforations C1 are formed in the cover member C along the longitudinal direction of the cover member C as a cover release assisting means (opening means). Thereby, the release of the cover of the cover member C can be performed more easily and reliably. That is, the connection between the outer needle hub 3 and the protector 8 can be more easily and reliably released.

In such an indwelling needle assembly 1, the outer needle 2 or the outer needle hub 3 (the outer needle with hub 4)
Is gripped (fixed) and the inner needle hub 6 is moved in the proximal direction, the vicinity of the boundary between the protector 8 and the outer needle hub 3 is covered with the cover member C, that is, the outer needle hub 3 is In a state where the connection with the needle hub 3 is maintained, the protector 8 moves in a direction away from the inner needle hub 6 and stores the needle tip 51 of the inner needle 5.

When the protector 8 is engaged with the inner needle 5, the outer needle 2 or the outer needle hub 3 is gripped (fixed), and the inner needle hub 6 is further moved in the proximal direction. The eye C1 gradually breaks. Thereby, the joint between the protector 8 and the outer needle hub 3 is released. That is, the protector 8 is removed from the outer needle hub 3.

The covering of the cover member C is as follows.
It can also be forcibly released using a hand or the like.

The perforations are not limited to those shown in the figure, and may be formed along the circumferential direction of the cover member C or in a spiral shape. The number of perforations is not particularly limited. It will not be done.

As described above, the indwelling needle assembly of the present invention has been described with reference to the illustrated embodiments. However, the present invention is not limited to these embodiments, and the components constituting the indwelling needle assembly have similar functions. It can be replaced with any configuration that can be exhibited.

Further, the indwelling needle assembly of the present invention comprises the first
Any of two or more of the tenth to tenth embodiments may be combined.

[0165]

As described above, according to the present invention, since the joining force between the protector and the outer needle hub is appropriately set, for example, the operation of extracting the inner needle from the outer needle, the inner needle inside the protector, The operation of storing the needle tip, the operation of removing the protector from the outer needle hub, and the like can be easily and reliably performed.

Further, according to the present invention, good operability can be obtained while minimizing the size by minimizing the increase in the maximum outer diameter of the outer needle hub.

In particular, the provision of the joining force adjusting means can improve the above-mentioned effect.

Further, when the shutter member is provided, the needle tip once covered does not protrude from the tip of the protector due to its operation. Further, the present invention can achieve the above-mentioned effects with a small and simple structure.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment (assembled state) 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 (a state in which a protector covers a needle tip of an inner needle).

FIG. 3 is a perspective view illustrating a configuration of a distal end side of an indwelling needle assembly according to a second embodiment.

FIG. 4 is a longitudinal sectional view showing a configuration near a protector included in an indwelling needle assembly according to a second embodiment.

FIG. 5 is a perspective view illustrating a configuration of a distal end side of an indwelling needle assembly according to a third embodiment.

FIG. 6 is a longitudinal sectional view showing a configuration near a protector included in an indwelling needle assembly according to a third embodiment.

FIG. 7 is a perspective view showing a configuration of a distal end side of an indwelling needle assembly according to a fourth embodiment.

FIG. 8 is a longitudinal sectional view showing a configuration near a protector included in an indwelling needle assembly according to a fourth embodiment.

FIG. 9 is a longitudinal sectional view showing a configuration near a protector included in an indwelling needle assembly according to a fifth embodiment.

FIG. 10 is a perspective view showing a configuration of a distal end side of an indwelling needle assembly according to a sixth embodiment.

FIG. 11 is a longitudinal sectional view showing a configuration near a protector included in an indwelling needle assembly according to a sixth embodiment.

FIG. 12 is a perspective view illustrating a configuration of a distal end side of an indwelling needle assembly according to a seventh embodiment.

FIG. 13 is a longitudinal sectional view showing a configuration near a protector included in an indwelling needle assembly according to a seventh embodiment.

FIG. 14 is a plan view showing a configuration near a protector of an indwelling needle assembly according to an eighth embodiment.

FIG. 15 is a perspective view showing a configuration of a distal end side of an indwelling needle assembly according to a ninth embodiment.

FIG. 16 is a plan view showing a configuration near a protector of an indwelling needle assembly according to a ninth embodiment.

FIG. 17 is a perspective view showing a configuration of a distal end side of an indwelling needle assembly according to a tenth embodiment.

[Explanation of symbols]

 Reference Signs List 1 indwelling needle assembly 2 outer needle 21 tip opening 3 outer needle hub 31 flange portion 32 parallel groove 33 inclined groove 331 upper surface 34 flange portion 4 outer needle with hub 5 inner needle 51 needle tip 6 inner needle hub 61 flange 62 ventilation filter 63 concave portion 7 inner needle with hub 8 protector 81 protector body 81a exposed portion 82 needle body passage 83 space 84 adhesion layer 85 shutter member 86 convex portion 87 rib 88 minute convex portion 89 projecting portion 89a projecting portion 891a tapered portion 892a upper side surface 89b Projecting part 891b Tip part 91 Recess 92 Engaging member 93 Claw C Cover member C1 Perforation

Claims (10)

[Claims] 1. An inner needle hub, an inner needle fixed to a distal end side of the inner needle hub, and a protector which is installed so as to be movable relative to the inner needle and covers at least a needle tip of the inner needle. An outer needle hub joined to the distal end of 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 protector and the outer needle hub Wherein the joining force of the inner needle is greater than the frictional force between the protector and the inner needle when the inner needle is withdrawn from the outer needle. 2. The indwelling needle assembly according to claim 1, wherein a joining force between the protector and the outer needle hub can be released with a force of 0.06 kgf or less. 3. When the inner needle is inserted into the outer needle and an operation of pulling out the inner needle from the outer needle in a state where the protector and the outer needle hub are joined to each other, the protector and the protector are connected to each other. 2. The joint with the outer needle hub is maintained.
Or the indwelling needle assembly according to 2. 4. A joint force adjusting means for adjusting a joint force between the protector and the outer needle hub.
The indwelling needle assembly according to any one of the above. 5. The indwelling needle assembly according to claim 4, wherein said joining force adjusting means is constituted by a large number of minute projections formed at a contact portion where said protector and said outer needle hub come into contact. 6. The indwelling needle assembly according to claim 4, wherein said joining force adjusting means is constituted by at least one convex portion formed at a contact portion where said protector and said outer needle hub come into contact with each other. 7. The indwelling needle assembly according to claim 4, wherein the joining force adjusting means is formed by forming a contact portion where the protector and the outer needle hub come into contact with each other with an elastic material. 8. The indwelling needle assembly according to claim 4, wherein the joining force adjusting means is configured by forming a contact portion where the protector and the outer needle hub come into contact with each other with an adhesive material. 9. A cover member that joins the protector and the outer needle hub, and the cover member covers a vicinity of a boundary between the protector and the outer needle hub.
4. The indwelling needle assembly according to any one of claims 3 to 3. 10. An inner needle hub, an inner needle fixed to a distal end side of the inner needle hub, and a protector which is installed so as to be movable relative to the inner needle and covers at least a tip of the inner needle. An outer needle hub joined to the distal end of 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. An end has an outwardly projecting flange portion, the protector has at least one outwardly projecting portion, and when the protector and the outer needle hub are joined, the flange portion and An indwelling needle assembly, wherein the protruding portion does not interfere with each other.