JP2002224217A - Chip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chip connectable to a tube or a connector of a blood vessel line, while suppressing the increase of the residual liquid in a syringe with a capillary at the tip. SOLUTION: This chip 1 is used by being mounted on (together with) the syringe 10 indicated in the figure 1, is constituted of an almost cylindrical member having an outer diameter larger than the outer diameter of a needle tube 11 and is provided with a tapered part 2 where the outer diameter is gradually reduced toward the tip on the tip part. The tapered part 2 is inserted and fitted to the end part of the tube constituting the various kinds of lines and the connector, etc. Also, the chip 1 is provided with a fitting part 4 on the base end part and the inside of the fitting part 4 is communicated to a flow path 3 formed inside the chip 1 along a longitudinal direction. In the state indicated in the figure 1, the needle tube 11 is inserted to the flow path 3, the flow path 3 and the inner cavity of the needle tube 11 are communicated, a reduced diameter part 121 is fitted to the fitting part 4 and the chip 1 is fixed (mounted to the syringe 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip for use with a syringe having a thin tube at the tip.

[0002]

2. Description of the Related Art In the case of children, for example, since the total amount of a drug solution to be administered is small, it is necessary to use a syringe with a small amount of residual solution (dead volume) in order to reliably administer a desired amount of the drug solution. .

[0003] As such a syringe, a syringe for insulin injection used by a diabetic patient has been conventionally used. In this syringe, a needle having a sharp needle tip is fixedly attached to the distal end portion of an outer cylinder. Is administered (injection).

[0004] This syringe is excellent in that it can administer a drug solution to a patient without waste. However, when orally administered to a pediatric patient or the like, this syringe has a sharp needle tip, so There was a possibility of puncturing the patient's body.
Furthermore, it has a drawback that it cannot be connected to an end of a tube constituting a variety of lines to be placed in a patient such as a vascular system line, an enteral / tubal system line, a drainage / perfusion line, a connector, or the like. ing.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to suppress an increase in the amount of residual liquid in a syringe having a thin tube at the distal end,
For example, an object of the present invention is to provide a chip which can be connected to an end of a tube constituting a vascular line or the like, a connector, or the like.

[0006]

This and other objects are achieved by the present invention which is defined below as (1) to (4).

(1) A tip for use with a syringe having a thin tube at the tip end, the tip having a flow passage for accommodating the thin tube and communicating with an inner cavity of the thin tube, and having an outer diameter outside the thin tube. The fitting portion is set to be larger than the diameter, and has, at the base end portion, a fitting portion that can be fitted to the distal end portion of the syringe, and the inside of the fitting portion communicates with the flow path, and at least the distal portion has an outer diameter. Characterized in that the tip has a tapered portion that gradually decreases toward the tip.

(2) The chip according to (1), wherein a projection is formed on an inner surface of the fitting portion to prevent the chip from being detached from the syringe.

(3) The tip according to (1), which is formed integrally with the syringe.

(4) A syringe assembly provided with the tip according to (1) or (2) at the tip.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a chip according to the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

Before describing the chip of the present invention, a low-volume syringe will be described first as an example of a syringe used with the chip of the present invention.

FIG. 1 is a partial cross-sectional side view of a syringe equipped with the tip of the present invention. In the following description, the upper side in FIG. 1 is referred to as a “proximal end” and the lower side is referred to as a “distal end”.

A syringe 10 shown in FIG. 1 has a needle tube (small tube) 11 having a needle tip 111, an outer tube (syringe outer tube) 12 fixed to the base end of the needle tube 11, and a liquid tight inside the outer tube 12. And a plunger (pusher) 14 connected to the gasket 13 to move the gasket 13 within the outer cylinder 12.

The syringe 10 is used for injection (administration) of, for example, a drug solution for children, an expensive drug solution or the like (hereinafter, simply referred to as "medical solution"), and has a low volume (for example, 0.3 to 0.3 ml). The syringe has a small amount of remaining liquid (dead volume) (for example, about 5 μL or less).

Hereinafter, each component will be described. The needle tube 11 is a hollow needle and is made of, for example, a metal material such as stainless steel. A sharp needle tip 111 is formed at the tip of the needle tube 11.

An outer cylinder 12 is fixed (fixed) to the base end of the needle tube 11 in a liquid-tight manner, and the inner lumen of the needle tube 11 and an outer cylinder 12 described later are fixed.
Is connected to the storage space 124.

The needle tube 11 is fixed to the outer cylinder 12 by a method such as caulking, fusion (heat fusion, ultrasonic fusion, high frequency fusion, or the like), bonding with an adhesive, or the like.

The outer cylinder 12 is formed of a bottomed cylindrical member.
In order to ensure the visibility inside, at least a portion of the storage space 124 described later is substantially transparent.

A reduced diameter portion 121 having a diameter reduced from the body of the outer cylinder 12 is integrally formed at the tip of the outer cylinder 12 so as to protrude.
The needle tube 11 is fixed substantially at the center of the reduced diameter portion 121. The fitting portion 4 of the chip 1 described later is fitted into the reduced diameter portion 121.

A plate-like flange 122 is integrally formed on the outer periphery of the base end of the outer cylinder 12. When the plunger 14 is moved relative to the outer cylinder 12, the operation can be performed by putting a finger on the flange 122.

On the inner periphery of the base end of the outer cylinder 12, there is formed a convex portion 123 which is formed in a ring shape. The convex portion 123 has a plate member 14 of the plunger 14 described later.
The locking of 1 prevents the plunger 14 from moving in the proximal direction. That is, the detachment (separation) of the plunger 14 from the outer cylinder 12 is more reliably prevented (prevented).

The outer cylinder 12 and a gasket 13 described later
A storage space 124 is formed in a portion surrounded by.

A gasket 13 made of an elastic material is accommodated in the outer cylinder 12. This gasket 13
Can slide in the longitudinal direction in the outer cylinder 12 by operating the plunger 14 described later.

On the outer peripheral portion of the gasket 13, a pair of ring-shaped protrusions 131 are formed at predetermined intervals in the axial direction. The protrusion 131 slides while being in close contact with the inner peripheral surface 125 of the outer cylinder 12, so that liquid tightness is more reliably maintained and slidability is improved.

The gasket 13 is connected to a plunger 14 for moving the gasket 13 in the outer cylinder 12 in the longitudinal direction.

The plunger 14 is mainly composed of a cylindrical member, and four ribs are formed on the outer peripheral surface thereof at intervals of approximately 90 ° along the longitudinal direction.

A plate member 141 is integrally formed on the distal end side of the plunger 14, and a plate-like flange 142 is integrally formed on the base end.

At the tip of the plunger 14, a head (not shown) is formed.
Insert and fit into the hollow part (not shown) of the gasket 1
3 is mounted on the plunger 14.

When the plunger 14 is moved (pulled) in the proximal direction, the gasket 130 moves in the proximal direction, and the volume of the storage space 124 increases. This allows
The chemical solution can be sucked (collected) into the storage space 124. Further, when the plunger 14 is moved toward the distal end (pushed) from this state, the gasket 13 is moved.
Moves toward the distal end, the volume of the storage space 124 is reduced, and the chemical solution is discharged.

Next, the chip of the present invention will be described. <First Embodiment> A first embodiment of the chip of the present invention will be described.

FIG. 2 is a half sectional view showing a first embodiment of the chip of the present invention. In the following description, the right side in FIG. 2 is referred to as a “proximal end”, and the left side is referred to as a “distal end”.

The tip 1 shown in FIG. 2 is mounted on the syringe 10 (along with the syringe 10) and used in the state shown in FIG. In the following description, this state is referred to as “assembled state”.

The chip 1 is provided with a vascular system line such as an intravenous line, an intravenous drip line, a central parenteral nutrition line, an enteral nutrition line such as an oral nutrition line, an enteral nutrition line, and a nasal nutrition line.
It is used to connect the syringe 10 to an end of a tube or a connector that constitutes various lines to be placed in the patient, such as a tube line, a drainage / perfusion line such as a urine guide or a drain. .

The tip 1 is formed of a substantially cylindrical member having an outer diameter larger than the outer diameter of the needle tube 11, and has a tapered portion 2 at the distal end whose outer diameter gradually decreases toward the distal end. I have.

The syringe 10 is connected via the tip 1 by inserting and fitting the tapered portion 2 to the end of the tube or a connector.

The dimensions of the tapered portion 2 can be appropriately set according to the types of the above-described various lines and the like, and are not particularly limited. The syringe 10 is connected to an end of a tube constituting a vascular line, a connector, or the like. For example, the following can be set.

Outer diameter of tip of tapered portion 2 (length D in FIG. 2)
Is preferably about 3 to 7 mm, more preferably 3 to 5 mm.
mm.

The length of the tapered portion 2 (length L1 in FIG. 2) is
Preferably about 5 to 30 mm, more preferably 5 to 10
mm.

The inclination angle of the tapered portion 2 (the angle between the outer surface of the tapered portion 2 and the central axis: the angle θ in FIG. 2) is preferably about 1 to 6 °, more preferably 1.5 to 2.5 °. Degree.

The outer diameter of the tapered portion 2 may gradually decrease toward the tip over the entire length of the chip 1 in the longitudinal direction.

The chip 1 has a flow path 3 formed therein along the longitudinal direction. The tip 1 has a fitting portion 4 at the base end thereof, which can be fitted to the reduced diameter portion 121 of the syringe 10, and the inside of the fitting portion 4 communicates with the flow path 3.

In the assembled state, the needle tube 11 is inserted into the channel 3, and the reduced-diameter portion 121 is fitted into the fitting portion 4. Thus, the tip 1 is fixed (attached) to the syringe 10 in a state where the flow path 3 and the lumen of the needle tube 11 communicate with each other.

Note that the tip 1 is
It may be simply fixed by fitting, but it may be bonded with an adhesive or fused (heat fusion, ultrasonic fusion, high frequency fusion, etc.).

The tip 1 is the outer cylinder 1 of the syringe 10.
2 may be integrally formed.

The inner diameter (diameter) of the flow path 3 is set to be substantially equal to the outer diameter of the needle tube 11. For this reason, in the assembled state, the inner surface of the flow path 3 and the outer surface of the needle tube 11 come into contact with each other, thereby preventing a gap from being formed therebetween. This makes it possible to more reliably prevent (prevent) the chemical solution from flowing out from the base end of the chip 1 during the operation of discharging the chemical solution from the storage space 124.

At the base end of the flow path 3, a press-contact portion 31 that presses against the outer surface of the needle tube 11 in an assembled state is formed so as to protrude inward. By providing such a pressure contact portion 31, it is possible to more reliably prevent (prevent) the chemical solution from flowing out from the base end of the chip 1.

In the assembled state, the tip 1 is configured such that the tip of the needle tube 11 (tip of the needle tip 111) does not protrude from the tip thereof. That is, the flow channel 3 is configured to house the needle tube 11 therein. Thus, when the syringe 10 with the chip 1 attached thereto is connected to an end of a tube or a connector or the like constituting the above-described various lines, it is possible to prevent the inner surfaces of the syringe 10 from being damaged.

In some cases, the syringe 10 is used to administer an oral drug solution into the oral cavity of a patient such as a child. Inadvertently, the patient is given the needle tip 1 of the needle tube 11
11 can be reliably prevented from touching, so that the safety is high.

The dimensions of the flow path 3 are not particularly limited. In the case of the present embodiment which is used by being mounted on the syringe 10 shown in FIG. 1, for example, it can be set as follows.

The diameter of the flow path 3 (length d in FIG. 2) is preferably about 0.1 to 1 mm, more preferably 0.3 to 0.
It is about 5 mm.

The length of the flow path 3 (length L2 in FIG. 2) is preferably about 5 to 20 mm, more preferably 10 to 15 m.
m.

The method for manufacturing such a chip 1 is as follows.
Although not particularly limited, for example, an injection molding method, an extrusion molding method, a compression molding method, a blow molding method, a cast molding method and the like can be mentioned, and among them, the injection molding method is preferable. According to the injection molding method, the chip 1 having a more complicated shape can be easily and reliably manufactured with high dimensional accuracy.

As the constituent material of the chip 1, various resin materials can be cited, but polyethylene and polypropylene are particularly preferably used because they are excellent in moldability by an injection molding method.

A syringe 1 equipped with such a tip 1
At 0, the remaining liquid amount (dead volume) is
The outer diameter of the distal end of the syringe 10 (the outer diameter of the needle tube 2) while maintaining the amount substantially equal to (or slightly increasing) the amount of the single case, that is, while suppressing the increase in the residual liquid amount.
And connection to the end of a tube or a connector or the like constituting the various lines described above becomes possible.

Incidentally, from such a viewpoint, the tapered portion 2
Is preferably about D ≧ 1.5d, and more preferably about 14d ≧ D ≧ 8d.

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

FIG. 3 is a half sectional view showing a second embodiment of the chip of the present invention. Hereinafter, the chip 1 shown in FIG. 3 will be described focusing on differences from the first embodiment, and the description of the same matters will be omitted. In the following description, the right side in FIG. 3 is referred to as a “proximal end” and the left side is referred to as a “distal end”.

In the chip 1 of the second embodiment, the structure of the fitting portion 4 is different, and the rest is the same as the first embodiment.

That is, in the chip 1 of the second embodiment,
A pair of protrusions (pull-out prevention means) 41 are formed on the inner surface of the fitting portion 4 so as to protrude in a ring shape inward.

By providing such projections 41,
In the assembled state, the chip 1 can be more reliably prevented from coming off (falling out) from the syringe 10.

The number of projections 41 is not limited to the number shown in the figure, but may be one or three or more.

In the chip 1 having such a configuration, the same effects as those of the chip of the first embodiment can be obtained.

Although the chip of the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to these embodiments, and the components constituting the chip may have any structure capable of exhibiting the same function. Can be replaced with

In addition, since the chip of the present invention is dimensioned so that it can be mounted on an existing low-capacity syringe, there is no need to separately (newly) manufacture a low-capacity syringe connectable to various lines. It is advantageous for reduction of the amount.

The syringe to which the tip of the present invention is attached is not limited to a low-capacity syringe, but may be any of various syringes having a thin tube at the tip.

The dimensions of the chip of the present invention can be appropriately set according to, for example, the type and dimensions of a syringe to be mounted, lines to be connected, and the like.

[0068]

As described above, according to the present invention, the outer diameter of the thin tube (outer diameter of the distal end of the syringe) while suppressing the increase in the residual liquid amount (dead volume) of the syringe having the thin tube at the distal end. And connection to the end of a tube, a connector, or the like that forms various lines to be placed in the patient becomes possible.

Since the tip of the thin tube does not protrude from the tip of the tip, it can be used more safely, especially when the thin tube is a needle tube having a needle tip.

Further, by making the diameter of the flow path of the chip substantially equal to the outer diameter of the thin tube, or by providing the flow path with a press-contact portion for pressing the outer surface of the thin tube, for example, a chemical solution or the like can be discharged from an undesired place. Leakage can be more reliably prevented.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view of a syringe equipped with a tip of the present invention.

FIG. 2 is a half sectional view showing a first embodiment of the chip of the present invention.

FIG. 3 is a half sectional view showing a second embodiment of the chip of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 tip 2 tapered part 3 flow path 31 pressure contact part 4 fitting part 41 protrusion 10 syringe 11 needle tube 111 needle tip 12 outer cylinder 121 reduced diameter part 122 flange 123 convex part 124 storage space 125 inner surface 13 gasket 131 protrusion 14 plunger 141 plate Member 142 Flange 100 Syringe assembly

Claims (4)

[Claims] 1. A tip for use with a syringe provided with a thin tube at a distal end portion, said tip having a flow path for containing said thin tube and communicating with an inner cavity of said thin tube, wherein an outer diameter is an outer diameter of said thin tube. It is set larger, and has a fitting portion at the base end that can be fitted to the distal end of the syringe. The inside of the fitting portion communicates with the flow path, and the outer diameter is at least at the distal end. A chip having a tapered portion that gradually decreases toward a tip. 2. The tip according to claim 1, wherein a projection is formed on an inner surface of the fitting portion to prevent the tip from being detached from the syringe. 3. The tip according to claim 1, wherein the tip is formed integrally with the syringe. 4. A syringe assembly provided with the tip according to claim 1 at a tip thereof.