JPH0220260B2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Technical Field The present invention relates to a so-called over-the-needle type blood vessel, which is constructed by fitting an intravascular indwelling catheter to the outside of a stainless steel inner needle, and protecting the inner needle and catheter with a protector. This invention relates to internal indwelling needles, and particularly to improvements in protectors.

(2) Background Art An example of a conventional over-the-needle type (a type in which a catheter is fitted on the outside of an inner needle) intravascular indwelling needle is shown in FIGS. 1 and 2. FIG. 1 shows the state before use provided to a hospital, and 1 is a stainless steel inner needle, the proximal end of which is supported by an inner needle hub 2. Reference numeral 3 denotes an intravascular indwelling catheter made of fluororesin or the like, which is fitted onto the outside of the inner needle 1 and whose proximal end is supported by the catheter hub 4. The inner needle hub 2 is engaged with the catheter hub 4. 5 is a pencil cap-shaped protector made of plastic such as polypropylene, polyethylene, hard polyvinyl chloride, etc.;
The catheter 3 is housed in the needle protection hole 6, and the inlet end is fitted into the inner needle hub 2. FIG. 2 shows the state after use, and the inner needle 1 is protected by the protector 5 and discarded, so there is no risk of accidentally injuring fingers or the like by the inner needle 1.

On the other hand, in order to manufacture the protector at a very low cost, the protector 5 may be formed by extruding a long tube and cutting it into a predetermined length, as shown in FIG. Such a short tubular protector 5 is fitted onto the catheter hub 4,
Therefore, the protector 5 could not be fitted onto the inner needle hub 2, which is generally discarded, and there was a risk that the inner needle 1 would accidentally injure a finger or the like. This risk can be avoided by making the outer diameter of the distal end of the inner needle hub the same as the outer diameter of the protector-fitting part of the catheter hub 4, and not only with respect to the catheter hub 4 but also with respect to the inner needle hub 2. This can be solved by fitting the protector, but since the protector needs to be long enough to completely protect the inner needle, none of the above protectors can be used for intravascular indwelling needles such as those described below. This is not a universal solution because the inner needle becomes very long for various shapes and sizes (especially lengths).

That is, in the intravascular indwelling needle shown in FIG. 4, the catheter hub has a Y-shaped hub 4a, the protector 5 is made long enough to fit into the inner needle hub 2, and the Y-shaped hub is 4a, the length of the protector becomes very long and the overall length of the indwelling needle also becomes very long. Therefore, a large packaging material is required, resulting in high costs, and the protector is likely to come off within the packaging material. Therefore, the protector 5 is not fitted over the inner needle hub 2, but is fitted onto the Y-shaped hub 4a with the required dimensions that can protect the catheter 3 and the tips of the inner needle 1, so that the inner needle is not protected. The current situation is that this is not possible.

In addition, the catheter hub of the intravascular indwelling needle shown in FIG. 5 has a wing-shaped hub 4b, so that the inner needle becomes long and the protector 5 must be fitted to the wing-shaped hub 4b for the same reason. However, there is still a problem with protecting the inner needle. In other words, the universal solution to the above-mentioned risks is to leave the catheter in the blood vessel regardless of the type of intravascular indwelling needle that has a Y-shaped hub, wing-shaped hub, etc. The object of the present invention is to provide a protector capable of protecting an inner needle that is to be pulled out and discarded.

(3) Disclosure of the Invention The general object of the present invention is to provide an over-the-needle type intravascular indwelling needle that is equipped with a protector that has a housing section for an inner needle that is to be disposed of separately from a needle protection hole. Therefore, regardless of the type of intravascular indwelling needle, for example, whether it has a Y-shaped hub or a wing-shaped hub, the used inner needle can be disposed of by inserting it into the inner needle insertion accommodating part of the protector. An object of the present invention is to provide an intravascular indwelling needle that can eliminate the risk of accidentally injuring a finger or the like with an internal needle.

The specific, fundamental, and wide-ranging object of the present invention is to provide an inner needle 1 and a blood vessel into which the inner needle 1 is removably fitted on the outside of the inner needle 1 so that the tip of the inner needle 1 protrudes. It has an indwelling catheter 3 and a needle protection hole 6 that fits on the outside of the catheter 3 to protect the tip of the inner needle 1 and the catheter 3, and the inner needle 1 after being used is located adjacent to the needle protection hole 6. An object of the present invention is to provide an intravascular indwelling needle characterized by comprising a protector 5 having an inner needle accommodating portion 7 that can accommodate and engage a predetermined length from the distal end of the protector 5.

One of the more specific objects of the present invention is that the inner needle accommodating portion 7 has a required dimension smaller than the outer diameter of the inner needle 1, and has an inner diameter narrow enough to allow insertion of the blade at the tip of the inner needle. An object of the present invention is to provide an intravascular indwelling needle according to claim 1, characterized in that the hole 7a is formed.

A more specific example included in this embodiment is one characterized by cutting an extruded tube having needle protection holes 6 and pores 7a into a predetermined length, and a needle A device characterized in that the protective hole 6 and the pore 7a are integrally injection molded,
Furthermore, there is provided a device characterized in that one end of the pore 7a is widened into a tapered shape to serve as an inner needle insertion end, and a device characterized in that the deep end of the pore 7a is formed in a blind shape. There is a particular thing.

Another more specific object of the present invention is that the inner needle accommodating portion 7 has a bag-shaped groove 7 in cross section in the longitudinal direction that can engage and accommodate the distal end of the inner needle 1.
It is an object of the present invention to provide an intravascular indwelling needle according to an embodiment characterized in that (a).

A more specific embodiment included in this embodiment is a needle protector characterized by cutting an extruded tube having needle protection holes 6 and grooves 7a into a predetermined length, or The inner needle 1 is characterized by being formed by injection molding and having a hole 6 and a groove 7a.
It is an object of the present invention to provide a device characterized in that the insertion end is formed as an insertion end, and a device characterized in that the deep end of the groove 7a is formed in a blind shape.

(4) Best Mode for Carrying Out the Invention (4-1) Basic Embodiment (Fig. 6 a, b, c) To explain in detail the intravascular indwelling needle shown in Fig. 6 a, the inner needle 1 and It comprises an intravascular indwelling catheter 3 and a protector 5. The inner needle 1 is made of a stainless steel pipe, and its proximal end is supported by an inner needle hub 2. The intravascular indwelling catheter 3 is made of fluororesin or the like, and is fitted onto the outside of the inner needle 1 so that the inner needle 1 can be pulled out so that the tip of the inner needle 1 protrudes, and the proximal end is connected to the catheter. hub 4
It is supported by The protector 5 is made of plastic such as polypropylene, polyethylene, or hard polyvinyl chloride, and has a needle protection hole 6 that fits over the outside of the catheter 3 to protect the tip of the inner needle and the catheter 3. This shape has an inner needle accommodating portion 7 into which a predetermined length of the inner needle 1 can be inserted and engaged after finishing. The inner needle accommodating portion 7 is made of a small hole having an inner diameter smaller than the outer diameter of the inner needle 1, and is formed by cutting a tube material extruded with a molding machine into a predetermined length so as to be provided together with the needle protection hole 6. The protector can be formed at the lowest manufacturing cost.

The intravascular indwelling needle shown in FIG. 6b is equipped with a Y-shaped catheter hub 4a, and the protector 5 has a needle protection hole 6 which is not open at both ends and is shaped like a bag. Therefore, the protector 5 is not formed by cutting a tube formed by a molding machine as described above, but is manufactured one by one by a molding machine.

The intravascular indwelling needle shown in FIG. 6c is equipped with a wing-shaped catheter hub 4b, and the protector 5 is the same as that shown in FIG. 6a.

Therefore, in any of the cases shown in FIGS. 6a, b, and c, the indwelling catheter 3 is provided to the hospital in the state shown, and after the doctor inserts the indwelling needle into the blood vessel, the indwelling catheter 3 is left in the blood vessel and the catheter is removed. What is necessary is to pull out the inner needle 1 from the hub 4, insert and engage the inner needle 1 into the inner needle accommodating portion 7 of the protector 5, and then discard it.

(4-2) Modified Embodiment (FIGS. 7 to 16) This modified embodiment shows a catheter and catheter hub of the same type as shown in FIG. 6a. The same applies to the types shown in FIGS. 6b and 6c.

The intravascular indwelling needle shown in Fig. 7 has a protector 5.
The insertion end of the fine hole 7a, which is the inner needle accommodating part, is widened to form a tapered part 8, which makes it easier to insert the inner needle into the fine hole 7a after use, and prevents misalignment during insertion. Considerations have been taken to prevent this.

The intravascular indwelling needle shown in FIG.
A tapered part 8 is provided at the insertion end of the small hole 7a, and a filler 9 is fitted at the insertion depth end to facilitate insertion and engagement and prevent misalignment of the inserted inner needle. The tip thereof is made not to protrude from the pore 7a.

The intravascular indwelling needle shown in FIG. 9 has a pore 7a of an extruded protector and the deep end of the needle protection hole 6 made blind by heat fusing or the like so that the tip of the inner needle inserted through the pore 7a does not protrude. It is.

The intravascular indwelling needle shown in FIG. 10 is one in which the needle protection hole 6 and the pore 7a of the protector 5 are integrally formed by injection molding with their respective insertion depth ends being blind.

Figures 11, 13, 14 and 15
In the intravascular indwelling needle shown in the figure, the inner needle insertion housing part 7 is provided on the inner or outer surface of the protector 5 as shown in Figures 12a and 12b, and can be inserted and engaged to prevent the housed inner needle from flying out. Groove 7b with bag-shaped cross section
It is equipped with a protector 5 that is
Since the inner needle insertion accommodating portion 7 has a bag-shaped groove 7b in cross section in the longitudinal direction, it is easy to expand when inserting the inner needle, and it is easy to insert the used inner needle, and when integrally molded by injection molding. Since the molding pin or groove 7b in which the needle protection hole 6 and the groove 7b are integral can be molded integrally with the mold cavity, molding becomes easier.

In FIG. 11, the protector 5 is made by cutting a tube material formed by a molding machine into a predetermined length to have a needle protection hole 6 and a groove 7b, and in FIG. 13, the insertion end of the groove 7b is formed into a tapered part. In FIG. 14, a protector 5 similar to the above is formed and a filler 9 is fitted into one end of the groove 7b, and in FIG.
The groove 7b of the protector shown in the figure and the deep end of the needle protection hole 6 are made blind by heat fusing or the like.

In FIG. 16, the needle protection hole 6 and the groove 7b are integrally formed by injection molding, with the insertion depth end being blind.

The grooves 7b in FIGS. 11, 13, 14, 15, and 16 are of the same type as shown in FIG. 12a, but the same type as shown in FIG. 12b is also used. shall be.

(5) Effects As explained above, in the intravascular indwelling needle of the present invention, an intravascular indwelling catheter is fitted so that the tip of the inner needle protrudes outside the inner needle, and the catheter is attached to protect the catheter. An essential feature is that the hub is fitted with a protector having an inner needle accommodating portion within its wall thickness.

Therefore, the intravascular indwelling needle of the present invention allows the used inner needle to be disposed of by storing it in the inner needle insertion accommodating portion of the protector. There is a risk of accidentally injuring fingers etc. with the used inner needle.
According to the present invention, this problem is universally avoided, regardless of the type of indwelling needle having a Y-shaped hub, a wing-shaped hub, or the like.

Further, according to an embodiment of the present invention, the inner needle accommodating portion is formed into a pore or groove with a predetermined inner diameter, and an extrusion-molded tube having the pore or groove is cut into a predetermined length. The production cost is the lowest, which contributes to keeping the overall cost low, and according to an embodiment in which the needle protection hole and the pore or groove are integrally injection molded, the deep end of the pore can be made blind. Unlike extrusion molding described above, there is no need to cut the tube material, so if it is made blind, the manufacturing cost of the protector will be the lowest, and one end of the pore or groove can be tapered. According to the embodiment in which the inner needle is expanded to form the inner needle insertion end, it is easier to insert the inner needle after use, and it is possible to prevent misbiting during insertion, further improving safety and reliability, and furthermore, it is possible to prevent the insertion of the inner needle from the pores or grooves. According to the embodiment in which the deep end of the inner needle is blind, the insertion tip of the inner needle after use will not protrude due to over-insertion, and in this respect also, safety is improved.
It has various effects of increasing reliability.

[Brief explanation of drawings]

1 and 2 are partially cutaway elevational views of a conventional intravascular indwelling needle before use and in a discarded state. FIG. 3, FIG. 4, and FIG. 5 are partially cutaway elevational views of different conventional intravascular indwelling needles before use. FIGS. 6a, 6b, and 6c are partially cutaway elevational views of an intravascular indwelling needle according to a basic embodiment of the present invention before use, respectively. Figure 7, Figure 8, Figure 9
Figures, Figure 10, Figure 11, Figure 13, Figure 14,
15 and 16 are partially cutaway elevational views of an intravascular indwelling needle according to a modified embodiment of the present invention before use, and FIG.
14, FIG. 15, and FIG. 16. FIG. 12th
Figure b is a sectional view of another embodiment of the protector shown in Figure 12a. DESCRIPTION OF SYMBOLS 1...Inner needle, 2...Hub for inner needle, 3...Intravascular indwelling catheter, 4...Hub for catheter, 4a...Y-shaped hub, 4b...Airfoil hub, 5...Protector, 6...Needle protection hole, 7...Inner Needle housing section, 8...Tapered section, 9...
Tsumebe.

Claims (1)

[Scope of Claims] 1. An inner needle 1, an intravascular indwelling catheter 3 into which the inner needle 1 is removably fitted on the outside of the inner needle 1 so that the tip of the inner needle 1 protrudes, and this catheter. It has a needle protection hole 6 that fits on the outside of the inner needle 3 to protect the tip of the inner needle 1 and the catheter 3, and is adjacent to the needle protection hole 6 and holds the inner needle 1 after use by a predetermined length from the tip. An intravascular indwelling needle characterized by comprising: a protector 5 having an inner needle accommodating portion 7 capable of housing and engaging the inner needle. 2. The inner needle accommodating portion 7 is a pore 7a that is smaller than the outer diameter of the inner needle 1 and has an inner diameter that allows insertion of the blade at the tip of the inner needle. The intravascular indwelling needle according to item 1. 3. The intravascular indwelling needle according to claim 2, characterized in that it is formed by cutting an extruded tube having needle protection holes 6 and pores 7a into a predetermined length. 4. The intravascular indwelling needle according to claim 2, characterized in that the needle protection hole 6 and the pore 7a are integrally injection molded. 5. The intravascular indwelling needle according to any one of claims 2, 3, and 4, characterized in that one end of the pore 7a is widened into a tapered shape to serve as an inner needle insertion end. 6. The intravascular indwelling needle according to any one of claims 2, 3, 4, and 5, characterized in that the deep end of the pore 7a is formed in a blind shape. 7 The inner needle accommodating part 7 has a groove 7b having a bag-like cross section in the longitudinal direction, in which the tip of the inner needle 1 can be engaged and accommodated.
An intravascular indwelling needle according to claim 1, characterized in that: 8. The intravascular indwelling needle according to claim 7, characterized in that it is formed by cutting an extruded tube having needle protection holes 6 and grooves 7b into a predetermined length. 9. The intravascular indwelling needle according to claim 7, which is formed by injection molding and has a needle protection hole 6 and a groove 7b. 10. The intravascular indwelling needle according to any one of claims 7, 8, and 9, characterized in that one end of the groove 7b is widened into a tapered shape to serve as an insertion end of the inner needle 1. 11. The intravascular indwelling needle according to any one of claims 7, 8, 9, and 10, characterized in that the deep end of the groove is formed in a blind shape.