JPH03191965A - Indwelling needle - Google Patents

Abstract

PURPOSE:To provide an indwelling needle improved in user's convenience, where protrusion or exposure of the needle tip and the dripping or scattering of residual blood are prevented, and having high safety and high infection preventing effect by constituting the indwelling needle so that a protective cover needle is drawn out to allow a cap part to separate from the connection part of the cylindrical needle to simultaneously cover the tip of the inner cylindrical needle. CONSTITUTION:When thrusting is completed, an operator draws out an inner cylindrical needle 21b by his right hand while presses an indwelling needle by his left hand. In this case, the operator holds the hub part 221b of the inner cylindrical needle 21b by his right hand to perform draw-out operation but, since the cap part 24 on the free end side of a protective cover 22 is engaged with the connection part 221a of an outer cylindrical needle 21a in spite of the draw-out stroke at the beginning, the freely extensible part 23 of the protective cover 22 stretches and the tip 421b of the inner cylindrical needle 21b is covered with and received in the cap part 24 of the protective cover 22. Thereafter, when the inner cylindrical needle 21b is further drawn out to reach a final draw-out stroke, the cap part 24 is separated from the connection part 221a of the outer cylindrical needle 21a to complete the covering of the inner cylindrical needle 21b with the protective cover 22.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to improvements in indwelling needles used for infusions and the like.

<Prior Art> As is well known, indwelling needles are used, for example, for infusions, as shown in FIG. 8.

That is, the indwelling needle 1 is a needle that is placed in a vein of a patient's limb, for example, an arm 2, and feeds intravenous fluid supplied from an intravenous drip container 5 suspended on a stand 4 into the vein through a tube 3.

Recent indwelling needles of this type include, for example, as shown in FIG. 9, an outer cylinder needle 1a made of plastic or the like, and an inner cylinder needle 1b made of metal that is inserted into and out of the outer cylinder needle 1a.
Generally, it consists of
With the inner tube needle 1b housed in the outer tube needle 1a, it is inserted into the patient's infusion site.

At this time, since the metal needle tip of the inner tube needle 1b is slightly protruded, it can be easily inserted, and the tip of the outer tube needle 1a is also smoothly inserted into the vein following the entry of the inner tube needle 1b.

The inserted state of the outer cylindrical needle 1a is shown in FIG.
Preparation for infusion is completed by connecting the tube 3 for supplying intravenous fluid to the connection part 11a by loosely press-fitting it.

<Problems to be Solved by the Invention> However, when using the indwelling needle 1 with the conventional structure described above,
There were the following problems.

First, as shown in FIG. 10, when inserting the indwelling needle 1 into the limbs of the patient 1, for example, into the vein (blood vessel) 6 of the arm 2, the practitioner (doctor, nurse, etc.) generally After holding the indwelling needle 1 with your hand (for example, your right hand) and indwelling the external cylindrical needle 1a into the vein, use your other hand (for example, your left hand) to insert the area A where the needle tip is located.
It is necessary to crush the vein 6 by squeezing the part to prevent blood from flowing backwards.

For this reason, the left hand of the practitioner is naturally occupied, and the indwelling needle is placed in the right hand.
If the inner needle 1b is removed and the inner needle 1b is still held, the tube 3 for supplying motivation fluid must be connected to the connection part 11a of the outer needle 1a with the help of another person. No. In other words, this method requires two workers, which may be inconvenient.

On the other hand, place the inner cylinder needle 1b that you have pulled out with your right hand in an appropriate place around it (although it is difficult to secure an appropriate place to place it when administering an infusion in the bed area), and use your free right hand to place the tube 3 Although it is possible to perform the work alone by connecting the inner cylinder needle 1b, the practitioner is concerned about the inner cylinder needle 1b that has been placed, which is a hassle and prevents the practitioner from concentrating on the work with peace of mind.

This is because the sharp metal tip of the inner cylinder needle 1b that has just been removed is still exposed, and a small amount of backflow blood has accumulated inside it, so the practitioner may accidentally accidentally If a person, patient, or even an assistant touches the tip of the needle, it is extremely dangerous because it is easily damaged and there is a risk of infection due to blood adhesion.

In particular, these days, infectious diseases such as syphilis, serum hepatitis, and AIDS have become serious social problems, and practitioners are required to be extremely careful and nervous to prevent infection. .

This risk of infection may also occur during post-treatment of the inner tube needle 1b.

This is because the inner cylinder needle 1b eventually
This is because when the needle is inserted into the storage case 7 as shown in the figure, there is a risk that the hand holding the case may be accidentally injured by the tip of the needle.

Furthermore, as shown in FIG. 11, residual blood inside the inner cylinder needle 1b may drip or scatter, contaminating the surrounding area.

The present invention has been made in view of such conventional circumstances.

<Means for Solving the Problems> A feature of the present invention is that a retractable protective cover is attached that automatically covers the inner needle when the inner needle is removed.

More specifically, the present invention equipped with such a protective cover is an indwelling needle consisting of an outer needle and an inner needle inserted into and out of the outer needle, in which the hub portion of the inner needle is extendable and retractable. One end of the protective cover is fixed, while a cap portion covering the tip of the inner cylindrical needle is formed on the other free end side of the protective cover, and the cap portion is engaged with the connecting portion of the outer cylindrical needle. When the inner tube needle is removed, the protective cover is extended and the cap part is detached from the connection part of the outer tube needle and at the same time is placed on the indwelling needle that covers the tip of the inner tube needle.

<Function> With this indwelling needle, when an attempt is made to remove the inner barrel needle after the needle has been inserted into the infusion site, the cap portion on the free end side of the protective cover will touch the connecting portion of the outer barrel needle during the initial withdrawal stroke. Since the protective cover is engaged, the protective cover is extended, and the needle tip of the inner cylinder needle is stored in the cap part of the protective cover.Furthermore, in the subsequent final pulling stroke, the cap part is separated from the connection part of the outer cylinder needle. Covering of the inner cylinder needle with the protective cover is completed, and exposure of the needle tip and scattering of blood are effectively prevented.

<Embodiment> FIG. 1 shows an embodiment of an indwelling needle according to the present invention.

In the figure, 1.21a is an outer cylinder needle made of plastic or the like, and 21b is an inner cylinder needle made of metal or the like, which is inserted into and out of the outer cylinder needle 21a.

At the base of the outer cylindrical needle 21a is a connecting portion 221a having an enlarged diameter cylindrical shape.
is formed, and a telescopic protective cover 2 is provided on the enlarged diameter cylindrical hub portion 221b formed at the base of the inner cylindrical needle 21b.
This protective cover 22, whose end is fixed, includes a bellows-shaped retractable portion 23 and a cap portion 24 provided on the free end side of the protective cover 22.
The material of this stretchable part 23 is not particularly limited, but it is preferably formed of a tube-shaped material such as soft rubber or plastic.

The cap portion 24 holds the outer needle 21 when the inner needle 21b is inserted into the outer needle 21a to a predetermined position as shown in FIG.
It is a part that engages with the connecting part 221a of the inner cylinder needle 21b, and at the same time covers the needle tip 421b after the inner cylinder needle 21b is removed, as will be described later, so it is desirable that the structure has a little more rigidity. In this embodiment, the telescopic portion 23 is made of, for example, thick rubber or plastic, and
In securing the outer cylindrical needle 21a with the connecting portion 221a,
The connecting portion 221a is loosely press-fitted into the cylinder.

In the main indwelling needle 21 configured as shown in 2, the outer cylindrical needle 21a
When the inner cylindrical needle 21b is inserted to a predetermined position, that is, when the cap portion 24 of the protective cover 22 is press-fitted into the connecting portion 221a of the outer cylindrical needle 21a, the telescopic portion 2
3 is compressed so that the length of the needle part 321b of the inner cylinder needle 21b is slightly longer than the length of the needle part 321a of the outer cylinder needle 21a, so that the needle tip 421b of the inner cylinder needle 21b protrudes slightly.

Therefore, in this state, the practitioner can place the patient's infusion site,
In other words, if the needle is inserted into a vein or the like, the sharp metal needle tip 421b will stick first as described above, making the insertion easy. The tip is also inserted smoothly into the infusion site.

For example, if the practitioner performs this stabbing with his right hand,
The practitioner presses the drip portion corresponding to the needle tip with the other left hand to prevent backflow of blood.

When the insertion is completed in this way, the practitioner pulls out the inner cylinder needle 21b with his right hand while pressing it with his left hand.

In this case, the practitioner uses his/her right hand to touch the hub portion 221 of the inner cylinder needle 21b.
However, in the initial drawing stroke, the free end side of the protective cover 22 (D-8-Yap portion 24
is engaged in the connecting portion 221a of the outer cylindrical needle 21a, the telescopic portion 23 of the protective cover 22 expands, and the needle tip 421b of the inner cylindrical needle 21b engages with the cap portion 24 of the protective cover 22.
covered and stored inside.

After this, the cap part 24 is further pulled out, and when the final drawing stroke is reached, the cap part 24 is attached to the connecting part 221 of the outer cylinder needle 21a.
The inner cylinder needle 21b is removed from the inside of the cylinder a and becomes the state shown in FIG. 2, and the covering of the inner cylinder needle 21b with the protective cover 22 is completed.

Due to this effect, the length of the extendable portion 23 of the protective cover 22 when expanded is naturally set to a length corresponding to the length of the needle portion 321b of the inner cylinder needle 21b. Further, in order to prevent the needle tip 421b of the inner cylinder needle 21b housed in the cap portion 24 of the protective cover 22 from easily protruding or being exposed, it is preferable to attach the needle tip 421b to the tip of the cap portion 24 shown in FIG. 1 or 3(A). It is preferable to provide a needle tip exposure prevention means 25 consisting of a split piece or the like that is bent inward and has a one-way valve-like action. This figure 3 (A)
In this case, four divided pieces each having a cross-shaped cut are used, but the present invention is not particularly limited to this, and for example, as shown in FIG. 3 (B
) As shown in FIG.

Furthermore, a connecting portion 221 between the cap portion 24 and the outer cylinder needle 21a
In order to stabilize the engagement relationship with a, it is preferable to provide retaining means such as a retaining groove 26 and an engaging protrusion 27 that engage with each other in the image portion, as shown in FIG. 4, for example.

In this way, the inner tube needle 21b is covered over its entire length by the protective cover 22, so there is no risk of the needle tip 421b being exposed bare, and there is no need to worry about residual blood dripping or scattering. , the practitioner can safely place the removed inner cylinder needle 21b in the surroundings.

Then, with your free right hand, connect the connecting portion 22 of the outer cylinder needle 21a.
By connecting the tube for supplying the intravenous liquid to 1a, the preparation for the intravenous drip is completed.

In other words, even a second person can work with peace of mind.

FIG. 5 shows another embodiment according to the present invention.

This embodiment is also basically the same as that shown in FIG. It is a type of Rondo antenna system built into the system, which allows it to expand and contract.

In this case as well, the protective cover 22 covers the entire length of the inner cylinder needle 21b.
Since it is covered by the cylindrical slide body 28 and the cap part 24, the protrusion and exposure of the needle tip 421b can be prevented.
Residual blood is effectively prevented from dripping and scattering.

FIG. 6 shows yet another embodiment according to the present invention.

This embodiment is also basically the same as that shown in FIG.
This structure is made of a coil body 29 wound many times, so that it can be expanded and contracted.

In this case, as shown in FIG. 7, although the needle portion 321b of the inner cylinder needle 21b is only partially covered, the needle tip 421b is almost completely covered by the cap portion 24. Therefore, a certain degree of cover effect can be obtained.

In this case, due to this cover effect, the length of the cap portion 24 may be made longer.

This is because residual blood drips and scatters mainly at the needle tip 421.
This is because the needle tip 421b is substantially completely covered.

Therefore, depending on the needle with a small amount of residual blood and the intended use, this embodiment can also be used satisfactorily.

In addition, in each of the above embodiments, the telescopic portion 2 of the protective cover 22
Although some structures were shown as 3.23' and 23'',
The present invention is not limited to this. In addition, the connection portion 22 between the cap portion 24 of the protective cover 22 and the outer cylinder needle 21a
The engagement relationship with 1a is also not limited to press-fitting into the cylinder.

<Effects of the Invention> As is clear from the above description, according to the present invention, a retractable protective cover that automatically covers the inner needle when the inner needle is removed is attached, making it easy to use and keeping the needle in place. No protrusion or exposure of the tip, and no dripping or scattering of residual blood.
It is possible to provide an excellent indwelling needle that is safe and extremely effective in preventing infection.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of an indwelling needle according to the present invention, and FIG. 2 is a longitudinal cross-sectional view showing a state in which the removed inner cylinder needle of the indwelling needle of FIG. 1 is covered with a protective cover. Figures 3 (A) and 3 (B) are end views of the cap portion of the protective cover;
The figure is a partial vertical cross-sectional view showing the engagement relationship between the connecting part of the outer cylinder needle of the indwelling needle and the cap part of the protective cover, and FIG. 5 is a vertical cross-sectional view showing another embodiment of the indwelling needle according to the present invention. , FIG. 6 is a longitudinal cross-sectional view showing still another embodiment of the indwelling needle according to the present invention, and FIG. 7 shows a state in which the removed inner cylinder needle of the indwelling needle of FIG. 6 is covered with a protective cover. 8 is a schematic explanatory diagram illustrating the situation of intravenous drip, FIG. 9 is a vertical sectional view showing an example of a conventional indwelling needle, and FIG. 10 shows the process of using the indwelling needle shown in FIG. 9. FIG. 11 is an explanatory diagram showing the case where the inner tube needle of the indwelling needle of FIG. 9 is returned to the disposal case. In the figure, 21... 21a... 221a... 321a... 21b... 221b... 321b... 421b... 22... 23... 23'... ・Indwelling needle,・Outer cylinder needle, ・Hub part, ・Needle part, ・Inner cylinder needle, ・Connection part, ・Needle part, ・Needle tip, ・Protective cover, ・Stretchable part, ・Stretchable part, 23″...Stretchable Part, 24...Cap part,

Claims (1)

[Claims] In an indwelling needle consisting of an outer needle and an inner needle inserted into and out of the outer needle, one end of a retractable protective cover is fixed to the hub portion of the inner needle, while the other end of the protective cover is free. A cap portion is formed on the end side to cover the tip of the inner cylindrical needle, and the cap portion is engaged with the connecting portion of the outer cylindrical needle, so that when the inner cylindrical needle is removed, the protective cover extends and the cap portion is removed. An indwelling needle characterized in that it covers the tip of an inner tube needle at the same time as it detaches from the connection part of the tube needle.